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Rajaraman S, Rakshit S. Multiscale topology optimization of pelvic bone for combined walking and running gait cycles. Comput Methods Biomech Biomed Engin 2024; 27:796-812. [PMID: 37129885 DOI: 10.1080/10255842.2023.2205541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 04/10/2023] [Indexed: 05/03/2023]
Abstract
We propose a multiscale topology optimization procedure of pelvic bone using weighted compliance minimization. In macroscale optimization, a level set-based method is used, which gives a binary structure. In microscale optimization, cubic lattice-based homogenization is done while keeping the global geometry fixed. For the macroscale, a volume constraint equal to the volume of the pelvic bone is imposed, whereas, for the microscale, a mass constraint equal to the mass of the pelvic bone is imposed. The optimal geometries are compared with pelvic bone using different metrics and show good similarity with the same. Designed geometries are additively manufactured and experimentally tested for stiffness.
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Affiliation(s)
- S Rajaraman
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India
| | - Sourav Rakshit
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India
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Childs A, Chand D, Pereira J, Santra S, Rajaraman S. BacteSign: Building a Findable, Accessible, Interoperable, and Reusable (FAIR) Database for Universal Bacterial Identification. Biosensors (Basel) 2024; 14:176. [PMID: 38667169 PMCID: PMC11047924 DOI: 10.3390/bios14040176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 03/15/2024] [Accepted: 03/15/2024] [Indexed: 04/28/2024]
Abstract
With the increasing incidence of diverse global bacterial outbreaks, it is important to build an immutable decentralized database that can capture regional changes in bacterial resistance with time. Herein, we investigate the use of a rapid 3D printed µbiochamber with a laser-ablated interdigitated electrode developed for biofilm analysis of Pseudomonas aeruginosa, Acinetobacter baumannii and Bacillus subtilis using electrochemical biological impedance spectroscopy (EBIS) across a 48 h spectrum, along with novel ladder-based minimum inhibitory concentration (MIC) stencil tests against oxytetracycline, kanamycin, penicillin G and streptomycin. Furthermore, in this investigation, a search query database has been built demonstrating the deterministic nature of the bacterial strains with real and imaginary impedance, phase, and capacitance, showing increased bacterial specification selectivity in the 9772.37 Hz range.
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Affiliation(s)
- Andre Childs
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA
| | - David Chand
- Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA
| | - Jorge Pereira
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA
- Department of Chemistry, University of Central Florida, Orlando, FL 32816, USA
| | - Swadeshmukul Santra
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA
- Department of Chemistry, University of Central Florida, Orlando, FL 32816, USA
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL 32827, USA
| | - Swaminathan Rajaraman
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL 32827, USA
- Department of Electrical and Computer Engineering, University of Central Florida, Orlando, FL 32816, USA
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Seetharaman A, Christopher V, Dhandapani H, Jayakumar H, Dhanushkodi M, Bhaskaran N, Rajaraman S, Ranganathan R, Sunder Singh S, Vijayakumar V, Rajamanickam A, Suri A, Jagadish N, Rajkumar T, Ramanathan P. Optimization and Validation of a Harmonized Protocol for Generating Therapeutic-Grade Dendritic Cells in a Randomized Phase II Clinical Trial, Using Two Varied Antigenic Sources. Vaccines (Basel) 2024; 12:112. [PMID: 38400096 PMCID: PMC10892253 DOI: 10.3390/vaccines12020112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 11/30/2023] [Accepted: 12/13/2023] [Indexed: 02/25/2024] Open
Abstract
Autologous dendritic cell (DC)-based immunotherapy is a cell-based advanced therapy medicinal product (ATMP) that was first introduced more than three decades ago. In the current study, our objective was to establish a harmonized protocol using two varied antigenic sources and a good manufacturing practice (GMP)-compliant, manual method for generating clinical-grade DCs at a limited-resource academic setting. After obtaining ethical committee-approved informed consent, the recruited patients underwent leukapheresis, and single-batch DC production was carried out. Using responder-independent flow cytometric assays as quality control (QC) criteria, we propose a differentiation and maturation index (DI and MI, respectively), calculated with the QC cut-off and actual scores of each batch for comparison. Changes during cryopreservation and personnel variation were assessed periodically for up to two to three years. Using our harmonized batch production protocol, the average DI was 1.39 and MI was 1.25. Allogenic responder proliferation was observed in all patients, while IFN-gamma secretion, evaluated using flow cytometry, was detected in 10/36 patients and significantly correlated with CD8+ T cell proliferation (p value-0.0002). Tracking the viability and phenotype of cryopreserved MDCs showed a >90% viability for up to three years, while a mature DC phenotype was retained for up to one year. Our results confirm that the manual/semi-automated protocol was simple, consistent, and cost-effective, without the requirement for expensive equipment and without compromising on the quality of the final product.
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Affiliation(s)
- Abirami Seetharaman
- Department of Molecular Oncology, Cancer Institute (WIA), Adyar, Chennai 600036, India; (A.S.); (H.D.); (H.J.); (M.D.); (T.R.)
| | - Vasanth Christopher
- Department of Radiation Oncology, Cancer Institute (WIA), Adyar, Chennai 600036, India;
| | - Hemavathi Dhandapani
- Department of Molecular Oncology, Cancer Institute (WIA), Adyar, Chennai 600036, India; (A.S.); (H.D.); (H.J.); (M.D.); (T.R.)
| | - Hascitha Jayakumar
- Department of Molecular Oncology, Cancer Institute (WIA), Adyar, Chennai 600036, India; (A.S.); (H.D.); (H.J.); (M.D.); (T.R.)
| | - Manikandan Dhanushkodi
- Department of Molecular Oncology, Cancer Institute (WIA), Adyar, Chennai 600036, India; (A.S.); (H.D.); (H.J.); (M.D.); (T.R.)
| | - Narmadha Bhaskaran
- Department of Transfusion Medicine, Cancer Institute (WIA), Adyar, Chennai 600036, India;
| | - Swaminathan Rajaraman
- Department of Epidemiology, Cancer Institute (WIA), Adyar, Chennai 600036, India; (S.R.); (R.R.)
| | - Rama Ranganathan
- Department of Epidemiology, Cancer Institute (WIA), Adyar, Chennai 600036, India; (S.R.); (R.R.)
| | | | | | | | - Anil Suri
- National Institute of Immunology, Department of Biotechnology (DBT), Ministry of Science and Technology, New Delhi 110067, India; (A.S.); (N.J.)
- Centre for Cancer Immunotherapy, Sri Ram Cancer & Superspeciality Centre (SRCC), Mahatma Gandhi Medical College and Hospital, Jaipur 302022, India
| | - Nirmala Jagadish
- National Institute of Immunology, Department of Biotechnology (DBT), Ministry of Science and Technology, New Delhi 110067, India; (A.S.); (N.J.)
- Centre for Cancer Immunotherapy, Sri Ram Cancer & Superspeciality Centre (SRCC), Mahatma Gandhi Medical College and Hospital, Jaipur 302022, India
| | - Thangarajan Rajkumar
- Department of Molecular Oncology, Cancer Institute (WIA), Adyar, Chennai 600036, India; (A.S.); (H.D.); (H.J.); (M.D.); (T.R.)
- Research Oncology, Medgenome, Bangalore 560099, India
- IIT Madras, Chennai 600036, India
- Department of Nano sciences and Molecular Medicine, AIMS, Kochi 682041, India
| | - Priya Ramanathan
- Department of Molecular Oncology, Cancer Institute (WIA), Adyar, Chennai 600036, India; (A.S.); (H.D.); (H.J.); (M.D.); (T.R.)
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Radhakrishnan V, Venkatakrishnan K, Perumal Kalaiyarasi J, Selvarajan G, Mahaboobasha N, Victor PV, Anbazhagan M, Sivanandam DM, Rajaraman S. Dexamethasone-Free Antiemetic Prophylaxis for Highly Emetogenic Chemotherapy: A Double-Blind, Phase III Randomized Controlled Trial (CINV POD study). JCO Glob Oncol 2024; 10:e2300301. [PMID: 38237092 PMCID: PMC10805440 DOI: 10.1200/go.23.00301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 10/19/2023] [Accepted: 11/07/2023] [Indexed: 01/23/2024] Open
Abstract
PURPOSE The effectiveness of a dexamethasone (DEX)-free regimen for chemotherapy-induced nausea and vomiting (CINV) prophylaxis in patients receiving highly emetogenic chemotherapy (HEC) is not known. METHODS This was a double-blind, phase III trial designed to show the noninferiority of a DEX-free regimen (olanzapine, palonosetron, and fosaprepitant [OPF]) compared with the DEX-containing regimen (olanzapine, palonosetron, and DEX [OPD]). Chemotherapy-naïve patients age 18-80 years receiving single-day HEC were randomly assigned 1:1 to receive either the OPD regimen or the OPF regimen. The primary objective was to compare complete response (CR) rates for vomiting during the overall period (start of chemotherapy to 120 hours). Secondary objectives included CR for vomiting during the acute period (0-24 hours) and delayed period (24-120 hours), CR for nausea, and comparison of toxicities and patient-reported outcomes. RESULTS Three hundred forty-six patients received the study interventions, 174 in the OPD arm and 172 in the OPF arm. The DEX-free OPF arm had significantly higher CR rates for vomiting compared with the DEX-containing OPD arm in acute (94.7% v 85.6%; P < .004), delayed (81.9% v 50.5%; P < .001), and overall (79.6% v 48.8%; P < .001) periods. For nausea, CR rates in the OPF arm were higher in delayed (53.4% v 39.6%; P = .009) and overall (50.5% v 39.1%; P = .031) periods but not in the acute period (77.9% v 81.6%; P = .39). Fatigue (P = .009) and drowsiness (P = .002) were more in the OPF arm in the acute period and insomnia (P < .001) in the OPD arm in the overall period. CONCLUSION This study shows that a DEX-free OPF regimen is efficacious and should be considered a standard option for acute and delayed CINV prophylaxis for HEC.
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Mehra N, Gopisetty G, Subramani J, Dhanasekar S, Rajamanickam A, Perumal Kalaiyarasi J, Karunakaran P, Kannan K, Rajaraman S, Rajkumar T. Detection of serum M-protein in acetonitrile precipitates by MALDI-TOF mass spectrometry: A novel, low-cost methodology. Ann Clin Biochem 2023; 60:339-348. [PMID: 37158306 DOI: 10.1177/00045632231174144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
BACKGROUND Several studies have demonstrated the analytical sensitivity of MALDI-TOF mass spectrometry (MALDI-TOF MS) by immunoenrichment for M-protein analysis. We report the results of a novel, low-cost, reagent-based extraction process using acetonitrile (ACN) precipitation to enrich for κ and λ light chains which can be analysed by MALDI-TOF MS. METHODS Institutional Ethics committee approval was obtained. Serum samples from patients with monoclonal gammopathy of undetermined significance (MGUS), multiple myeloma (MM), plasmacytoma, AL amyloidosis and Waldenström macroglobulinemia (WM) underwent ACN precipitation. The images obtained were overlaid on apparently healthy donor serum samples to confirm the presence of M-protein. A sample was considered positive for M-protein if there was a sharp or broad peak within the κ or λ mass/charge (m/z) range: m/z- [M + 2H]2+: 11,550-12,300 Da and λ m/z- [M + 2H]2+: 11,100-11,500 Da. Images were acquired at a m/z range of 10,000-29,000 Da. Corresponding serum protein electrophoresis (SPEP), serum immunofixation electrophoresis (IFE) and serum free light chain (sFLC) assay by nephelometry were performed for all the samples. RESULTS Two-hundred-and-two serum samples were included in the study: MM- 184 (91%); AL amyloidosis- 2 (1%); plasmacytoma- 8 (4%); MGUS- 6 (3%) and WM- 2 (1%). All the SPEP positive samples were identified by MALDI-TOF MS. Out of 179 samples positive for M-protein by IFE, MALDI-TOF MS was positive in 176 samples (98%). Compared to IFE, the sensitivity and specificity of M-protein identification by MALDI-TOF MS were 98.3% and 52.2%, respectively. CONCLUSIONS This study demonstrates the feasibility of qualitatively identifying M-protein without the need for antibody-based immunoenrichment, making the technique cost-effective.
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Affiliation(s)
- Nikita Mehra
- Department of Medical Oncology, Cancer Institute (WIA), Chennai, Tamil Nadu, India
- Department of Molecular Oncology, Cancer Institute (WIA), Chennai, Tamil Nadu, India
| | - Gopal Gopisetty
- Department of Molecular Oncology, Cancer Institute (WIA), Chennai, Tamil Nadu, India
| | - Jayavelu Subramani
- Department of Molecular Oncology, Cancer Institute (WIA), Chennai, Tamil Nadu, India
| | - Sariga Dhanasekar
- Department of Molecular Oncology, Cancer Institute (WIA), Chennai, Tamil Nadu, India
| | | | | | - Parathan Karunakaran
- Department of Medical Oncology, Cancer Institute (WIA), Chennai, Tamil Nadu, India
| | | | - Swaminathan Rajaraman
- Department of Epidemiology, Biostatistics and Cancer Registry, Cancer Institute (WIA), Chennai, Tamil Nadu, India
| | - Thangarajan Rajkumar
- Department of Molecular Oncology, Cancer Institute (WIA), Chennai, Tamil Nadu, India
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Didier CM, Fox D, Pollard KJ, Baksh A, Iyer NR, Bosak A, Li Sip YY, Orrico JF, Kundu A, Ashton RS, Zhai L, Moore MJ, Rajaraman S. Fully Integrated 3D Microelectrode Arrays with Polydopamine-Mediated Silicon Dioxide Insulation for Electrophysiological Interrogation of a Novel 3D Human, Neural Microphysiological Construct. ACS Appl Mater Interfaces 2023; 15:37157-37173. [PMID: 37494582 DOI: 10.1021/acsami.3c05788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
Advances within in vitro biological system complexity have enabled new possibilities for the "Organs-on-a-Chip" field. Microphysiological systems (MPS) as such incorporate sophisticated biological constructs with custom biological sensors. For microelectromechanical systems (MEMS) sensors, the dielectric layer is critical for device performance, where silicon dioxide (SiO2) represents an excellent candidate due to its biocompatibility and wide utility in MEMS devices. Yet, high temperatures traditionally preclude SiO2 from incorporation in polymer-based BioMEMS. Electron-beam deposition of SiO2 may provide a low-temperature, dielectric serving as a nanoporous MPS growth substrate. Herein, we enable improved adherence of nanoporous SiO2 to polycarbonate (PC) and 316L stainless steel (SS) via polydopamine (PDA)-mediated chemistry. The resulting stability of the combinatorial PDA-SiO2 film was interrogated, along with the nature of the intrafilm interactions. A custom polymer-metal three-dimensional (3D) microelectrode array (3D MEA) is then reported utilizing PDA-SiO2 insulation, for definition of novel dorsal root ganglion (DRG)/nociceptor and dorsal horn (DH) 3D neural constructs in excess of 6 months for the first time. Spontaneous/evoked compound action potentials (CAPs) are successfully reported. Finally, inhibitory drugs treatments showcase pharmacological responsiveness of the reported multipart biological activity. These results represent the initiation of a novel 3D MEA-integrated, 3D neural MPS for the long-term electrophysiological study.
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Affiliation(s)
- Charles M Didier
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - David Fox
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - Kevin J Pollard
- Tulane University, 6823 St Charles Ave, New Orleans, Louisiana 70118, United States
| | - Aliyah Baksh
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - Nisha R Iyer
- University of Wisconsin-Madison, 330 N. Orchard Street, Madison, Wisconsin 53717, United States
| | - Alexander Bosak
- Tulane University, 6823 St Charles Ave, New Orleans, Louisiana 70118, United States
| | - Yuen Yee Li Sip
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - Julia F Orrico
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - Avra Kundu
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - Randolph S Ashton
- University of Wisconsin-Madison, 330 N. Orchard Street, Madison, Wisconsin 53717, United States
| | - Lei Zhai
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - Michael J Moore
- Tulane University, 6823 St Charles Ave, New Orleans, Louisiana 70118, United States
- AxoSim Inc., 1441 Canal St., New Orleans, Louisiana 70112, United States
| | - Swaminathan Rajaraman
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
- Primordia Biosystems Inc., 1317 Edgewater Drive, #2701, Orlando, Florida 32804, United States
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Castro JM, Sommerhage F, Khanna R, Childs A, DeRoo D, Rajaraman S. High-throughput microbead assay system with a portable, cost-effective Wi-Fi imaging module, and disposable multi-layered microfluidic cartridges for virus and microparticle detection, and tracking. Biomed Microdevices 2023; 25:21. [PMID: 37284878 PMCID: PMC10244845 DOI: 10.1007/s10544-023-00661-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/17/2023] [Indexed: 06/08/2023]
Abstract
In recent years biomedical scientific community has been working towards the development of high-throughput devices that allow a reliable, rapid and parallel detection of several strains of virus or microparticles simultaneously. One of the complexities of this problem lies on the rapid prototyping of new devices and wireless rapid detection of small particles and virus alike. By reducing the complexity of microfluidics microfabrication and using economic materials along with makerspace tools (Kundu et al. 2018) it is possible to provide an affordable solution to both the problems of high-throughput devices and detection technologies. We present the development of a wireless, standalone device and disposable microfluidics chips that rapidly generate parallel readouts for selected, possible virus variants from a nasal or saliva sample, based on motorized and non-motorized microbeads detection, and imaging processing of the motion tracks of these beads in micrometers. Microbeads and SARS-CoV-2 COVID-19 Delta variant were tested as proof-of-concept for testing the microfluidic cartridges and wireless imaging module. The Microbead Assay (MA) system kit consists of a Wi-Fi readout module, a microfluidic chip, and a sample collection/processing sub-system. Here, we focus on the fabrication and characterization of the microfluidic chip to multiplex various micrometer-sized beads for economic, disposable, and simultaneous detection of up to six different viruses, microparticles or variants in a single test, and data collection using a commercially available, Wi-Fi-capable, and camera integrated device (Fig. 1).
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Affiliation(s)
- Jorge Manrique Castro
- NanoScience Technology Center, University of Central Florida, Orlando, FL, 32816, USA
| | | | - Rishika Khanna
- Department of Mechanical Engineering, Indian Institute of Technology, Delhi, New Delhi, India
| | - Andre Childs
- NanoScience Technology Center, University of Central Florida, Orlando, FL, 32816, USA
| | | | - Swaminathan Rajaraman
- NanoScience Technology Center, University of Central Florida, Orlando, FL, 32816, USA.
- Primordia Biosystems, Costa Mesa, CA, USA.
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Bagde A, Dev S, Madhavi K Sriram L, Spencer SD, Kalvala A, Nathani A, Salau O, Mosley-Kellum K, Dalvaigari H, Rajaraman S, Kundu A, Singh M. Biphasic burst and sustained transdermal delivery in vivo using an AI-optimized 3D-printed MN patch. Int J Pharm 2023; 636:122647. [PMID: 36754185 PMCID: PMC10208719 DOI: 10.1016/j.ijpharm.2023.122647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 01/17/2023] [Accepted: 01/22/2023] [Indexed: 02/09/2023]
Abstract
The objective of the present study was to fabricate microneedles for delivering lipophilic active ingredients (APIs) using digital light processing (DLP) printing technology and quality by design (QbD) supplemented by artificial intelligence (AI) algorithms. In the present study, dissolvable microneedle (MN) patches using ibuprofen (IBU) as a model drug were successfully fabricated with DLP printing technology at ∼ 750 μm height, ∼250 μm base diameter, and tip with radius of curvature (RoC) of ∼ 15 μm. MN patches were comprised of IBU, photoinitiator, Lithium phenyl (2,4,6-trimethylbenzoyl) phosphinate (LAP), polyethylene glycol dimethacrylate (PEGDAMA)550 and distilled water and were developed using the QbD optimization approach. Optimization of print fidelity and needle morphology were achieved using AI implementing a semi-supervised machine learning approach. Mechanical strength tests demonstrated that IBU MNs formed pores both on Parafilm M® and human cadaver skin. IBU-MNs consisting of 0.23 %w/v and 0.49 %w/v LAP with 10 %w/v water showed ∼ 2 mg/cm2 sustained drug permeation at 72 h in skin permeation experiments with flux of ∼ 40 μg/cm2/h. Pharmacokinetic studies in rats displayed biphasic rapid first-order absorption with sustained zero-order input of Ko = 150ug/hr, AUC0-48h = 62812.02 ± 11128.39 ng/ml*h, Tmax = 2.66 ± 1.12 h, and Cmax = 3717.43 ± 782.25 ng/ml (using 0.23 %w/v LAP IBU MN patch). An in vitro in vivo relation (IVIVR) was conducted identifying a polynomial relationship between patch release and fraction absorbed in vivo. This study demonstrates fabrication of dissolvable DLP-printed microneedle patches for lipophilic API delivery with biphasic rapid first-order and sustained zero-order release.
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Affiliation(s)
- Arvind Bagde
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, USA
| | - Satyanarayan Dev
- College of Agriculture and Food Sciences, Florida A&M University, Tallahassee, FL 32307, USA.
| | | | - Shawn D Spencer
- Philadelphia College of Osteopathic Medicine, Philadelphia, PA 19131, USA
| | - Anilkumar Kalvala
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, USA
| | - Aakash Nathani
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, USA
| | - Oluwaseyi Salau
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, USA
| | - Keb Mosley-Kellum
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, USA
| | | | | | - Avra Kundu
- University of Central Florida, Orlando, FL 32816, USA
| | - Mandip Singh
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, USA.
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Aggarwal A, Rama R, Dhillon PK, Deepa M, Kondal D, Kaushik N, Bumb D, Mehrotra R, Kohler BA, Mohan V, Gillespie TW, Patel AV, Rajaraman S, Prabhakaran D, Ward KC, Goodman M. Linking population-based cohorts with cancer registries in LMIC: a case study and lessons learnt in India. BMJ Open 2023; 13:e068644. [PMID: 36878651 PMCID: PMC9990691 DOI: 10.1136/bmjopen-2022-068644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/08/2023] Open
Abstract
OBJECTIVES In resource-constrained settings, cancer epidemiology research typically relies on self-reported diagnoses. To test a more systematic alternative approach, we assessed the feasibility of linking a cohort with a cancer registry. SETTING Data linkage was performed between a population-based cohort in Chennai, India, with a local population-based cancer registry. PARTICIPANTS Data set of Centre for Cardiometabolic Risk Reduction in South-Asia (CARRS) cohort participants (N=11 772) from Chennai was linked with the cancer registry data set for the period 1982-2015 (N=140 986). METHODS AND OUTCOME MEASURES Match*Pro, a probabilistic record linkage software, was used for computerised linkages followed by manual review of high scoring records. The variables used for linkage included participant name, gender, age, address, Postal Index Number and father's and spouse's name. Registry records between 2010 and 2015 and between 1982 and 2015, respectively, represented incident and all (both incident and prevalent) cases. The extent of agreement between self-reports and registry-based ascertainment was expressed as the proportion of cases found in both data sets among cases identified independently in each source. RESULTS There were 52 self-reported cancer cases among 11 772 cohort participants, but 5 cases were misreported. Of the remaining 47 eligible self-reported cases (incident and prevalent), 37 (79%) were confirmed by registry linkage. Among 29 self-reported incident cancers, 25 (86%) were found in the registry. Registry linkage also identified 24 previously not reported cancers; 12 of those were incident cases. The likelihood of linkage was higher in more recent years (2014-2015). CONCLUSIONS Although linkage variables in this study had limited discriminatory power in the absence of a unique identifier, an appreciable proportion of self-reported cases were confirmed in the registry via linkages. More importantly, the linkages also identified many previously unreported cases. These findings offer new insights that can inform future cancer surveillance and research in low-income and middle-income countries.
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Affiliation(s)
- Aastha Aggarwal
- The Centre for Chronic Conditions and Injuries, Public Health Foundation of India, Gurugram, Haryana, India
- Centre for Chronic Disease Control, Dwarka, Delhi, India
| | | | - Preet K Dhillon
- The Centre for Chronic Conditions and Injuries, Public Health Foundation of India, Gurugram, Haryana, India
- Centre for Chronic Disease Control, Dwarka, Delhi, India
- Genentech Inc, South San Francisco, California, USA
| | - Mohan Deepa
- Madras Diabetes Research Foundation (ICMR Center for Advanced Research on Diabetes), Chennai, Tamil Nadu, India
| | - Dimple Kondal
- Centre for Chronic Disease Control, Dwarka, Delhi, India
| | - Naveen Kaushik
- Centre for Chronic Disease Control, Dwarka, Delhi, India
| | - Dipika Bumb
- Ramaiah International Centre for Public Health Innovations, Bengaluru, Karnataka, India
| | - Ravi Mehrotra
- Centre for Health, Innovation and Policy, Noida, Uttar Pradesh, India
- Department of Epidemiology, Rollins School of Public Health, Atlanta, Georgia, USA
| | - Betsy A Kohler
- North American Association of Central Cancer Registries, Springfield, Illinois, USA
| | - Viswanathan Mohan
- Madras Diabetes Research Foundation (ICMR Center for Advanced Research on Diabetes), Chennai, Tamil Nadu, India
- Dr. Mohan's Diabetes Specialities Centre (IDF Centre of Excellence in Diabetes Care), Gopalapuram, Chennai, Tamil Nadu, India
| | - Theresa W Gillespie
- Department of Hematology & Medical Oncology, Emory University School of Medicine, Atlanta, Georgia, USA
- Emory University Winship Cancer Institute, Atlanta, Georgia, USA
| | - Alpa V Patel
- Department of Population Science, American Cancer Society, Atlanta, Georgia, USA
| | | | - Dorairaj Prabhakaran
- The Centre for Chronic Conditions and Injuries, Public Health Foundation of India, Gurugram, Haryana, India
- Centre for Chronic Disease Control, Dwarka, Delhi, India
| | - Kevin C Ward
- Department of Epidemiology, Rollins School of Public Health, Atlanta, Georgia, USA
- Emory University Winship Cancer Institute, Atlanta, Georgia, USA
- Centre for Cancer Statistics, Rollins School of Public Health, Emory University, Atlanta, Georgia, USA
| | - Michael Goodman
- Department of Epidemiology, Rollins School of Public Health, Atlanta, Georgia, USA
- Emory University Winship Cancer Institute, Atlanta, Georgia, USA
- Centre for Cancer Statistics, Rollins School of Public Health, Emory University, Atlanta, Georgia, USA
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10
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Didier CM, Orrico JF, Cepeda Torres OS, Castro JM, Baksh A, Rajaraman S. Microfabricated polymer-metal biosensors for multifarious data collection from electrogenic cellular models. Microsyst Nanoeng 2023; 9:22. [PMID: 36875634 PMCID: PMC9974480 DOI: 10.1038/s41378-023-00488-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 12/19/2022] [Accepted: 01/09/2023] [Indexed: 05/28/2023]
Abstract
Benchtop tissue cultures have become increasingly complex in recent years, as more on-a-chip biological technologies, such as microphysiological systems (MPS), are developed to incorporate cellular constructs that more accurately represent their respective biological systems. Such MPS have begun facilitating major breakthroughs in biological research and are poised to shape the field in the coming decades. These biological systems require integrated sensing modalities to procure complex, multiplexed datasets with unprecedented combinatorial biological detail. In this work, we expanded upon our polymer-metal biosensor approach by demonstrating a facile technology for compound biosensing that was characterized through custom modeling approaches. As reported herein, we developed a compound chip with 3D microelectrodes, 3D microfluidics, interdigitated electrodes (IDEs) and a microheater. The chip was subsequently tested using the electrical/electrochemical characterization of 3D microelectrodes with 1 kHz impedance and phase recordings and IDE-based high-frequency (~1 MHz frequencies) impedimetric analysis of differential localized temperature recordings, both of which were modeled through equivalent electrical circuits for process parameter extraction. Additionally, a simplified antibody-conjugation strategy was employed for a similar IDE-based analysis of the implications of a key analyte (l-glutamine) binding to the equivalent electrical circuit. Finally, acute microfluidic perfusion modeling was performed to demonstrate the ease of microfluidics integration into such a polymer-metal biosensor platform for potential complimentary localized chemical stimulation. Overall, our work demonstrates the design, development, and characterization of an accessibly designed polymer-metal compound biosensor for electrogenic cellular constructs to facilitate comprehensive MPS data collection.
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Affiliation(s)
- Charles M. Didier
- NanoScience Technology Center, University of Central Florida, 4353 Scorpius Street, Research I, Suite 231, FL 32816 Orlando, USA
- Burnett School of Biomedical Sciences, University of Central Florida, 6900 Lake Nona Blvd, FL 32827 Orlando, USA
| | - Julia F. Orrico
- NanoScience Technology Center, University of Central Florida, 4353 Scorpius Street, Research I, Suite 231, FL 32816 Orlando, USA
| | - Omar S. Cepeda Torres
- NanoScience Technology Center, University of Central Florida, 4353 Scorpius Street, Research I, Suite 231, FL 32816 Orlando, USA
- Department of Biomedical Engineering, Polytechnic University of Puerto Rico, 377, 00918, Ponce de Leon, San Juan, Puerto Rico
| | - Jorge Manrique Castro
- NanoScience Technology Center, University of Central Florida, 4353 Scorpius Street, Research I, Suite 231, FL 32816 Orlando, USA
- Department of Electrical and Computer Engineering, University of Central Florida, 4238 Scorpius Street, FL 32816 Orlando, USA
| | - Aliyah Baksh
- NanoScience Technology Center, University of Central Florida, 4353 Scorpius Street, Research I, Suite 231, FL 32816 Orlando, USA
| | - Swaminathan Rajaraman
- NanoScience Technology Center, University of Central Florida, 4353 Scorpius Street, Research I, Suite 231, FL 32816 Orlando, USA
- Burnett School of Biomedical Sciences, University of Central Florida, 6900 Lake Nona Blvd, FL 32827 Orlando, USA
- Department of Electrical and Computer Engineering, University of Central Florida, 4238 Scorpius Street, FL 32816 Orlando, USA
- Department of Materials Science and Engineering, University of Central Florida, 12760 Pegasus Drive, Engineering I, Suite 207, FL 32816 Orlando, USA
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11
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Childs A, Pereira J, Didier CM, Baksh A, Johnson I, Castro JM, Davidson E, Santra S, Rajaraman S. Plotter Cut Stencil Masks for the Deposition of Organic and Inorganic Materials and a New Rapid, Cost Effective Technique for Antimicrobial Evaluations. Micromachines (Basel) 2022; 14:14. [PMID: 36677074 PMCID: PMC9864392 DOI: 10.3390/mi14010014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 12/12/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
Plotter cutters in stencil mask prototyping are underutilized but have several advantages over traditional MEMS techniques. In this paper we investigate the use of a conventional plotter cutter as a highly effective benchtop tool for the rapid prototyping of stencil masks in the sub-250 μm range and characterize patterned layers of organic/inorganic materials. Furthermore, we show a new diagnostic monitoring application for use in healthcare, and a potential replacement of the Standard Kirby-Bauer Diffusion Antibiotic Resistance tests was developed and tested on both Escherichia coli and Xanthomonas alfalfae as pathogens with Oxytetracycline, Streptomycin and Kanamycin. We show that the reduction in area required for the minimum inhibitory concentration tests; allow for three times the number of tests to be performed within the same nutrient agar Petri dish, demonstrated both theoretically and experimentally resulting in correlations of R ≈ 0.96 and 0.985, respectively for both pathogens.
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Affiliation(s)
- Andre Childs
- Department of Material Science and Engineering, University of Central Florida, Orlando, FL 32816, USA
| | - Jorge Pereira
- Department of Chemistry, University of Central Florida, Orlando, FL 32816, USA
| | - Charles M. Didier
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL 32827, USA
| | - Aliyah Baksh
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL 32827, USA
| | - Isaac Johnson
- Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA
| | - Jorge Manrique Castro
- Department of Electrical and Computer Engineering, University of Central Florida, Orlando, FL 32816, USA
| | - Edwin Davidson
- Department of Chemistry, University of Central Florida, Orlando, FL 32816, USA
| | - Swadeshmukul Santra
- Department of Chemistry, University of Central Florida, Orlando, FL 32816, USA
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL 32827, USA
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA
| | - Swaminathan Rajaraman
- Department of Material Science and Engineering, University of Central Florida, Orlando, FL 32816, USA
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL 32827, USA
- Department of Electrical and Computer Engineering, University of Central Florida, Orlando, FL 32816, USA
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA
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12
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Castro JM, Sommerhage F, Khanna R, Childs A, DeRoo D, Rajaraman S. High-throughput microbead assay system with a portable, cost-effective Wi-Fi imaging module, and disposable multi-layered microfluidic cartridges for virus and microparticle detection, and tracking. Res Sq 2022:rs.3.rs-2383455. [PMID: 36597542 PMCID: PMC9810214 DOI: 10.21203/rs.3.rs-2383455/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In recent years biomedical scientific community has been working towards the development of high-throughput devices that allow a reliable, rapid and parallel detection of several strains of virus or microparticles simultaneously. One of the complexities of this problem lies on the rapid prototyping of new devices and wireless rapid detection of small particles and virus alike. By reducing the complexity of microfluidics microfabrication and using economic materials along with makerspace tools (Avra Kundu, Ausaf, and Rajaraman 2018) it is possible to provide an affordable solution to both the problems of high-throughput devices and detection technologies. We present the development of a wireless, standalone device and disposable microfluidics chips that rapidly generate parallel readouts for selected, possible virus variants from a nasal or saliva sample, based on motorized and non-motorized microbeads detection, and imaging processing of the motion tracks of these beads in micrometers. Microbeads and SARS-CoV-2 COVID-19 Delta variant were tested as proof-of-concept for testing the microfluidic cartridges and wireless imaging module. The Microbead Assay (MA) system kit consists of a WiFi readout module, a microfluidic chip, and a sample collection/processing sub-system. Here, we focus on the fabrication and characterization of the microfluidic chip to multiplex various micrometer-sized beads for economic, disposable, and simultaneous detection of up to six different viruses, microparticles or variants in a single test, and data collection using a commercially available, WiFi-capable, and camera integrated device (Fig. 1).
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13
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Radhakrishnan V, Lagudu PBB, Gangopadhyay D, Vijaykumar V, Rajaraman S, Perumal Kalaiyarasi J, Ganesan P, Ganesan TS. Neutropenic versus regular diet for acute leukaemia induction chemotherapy: randomised controlled trial. BMJ Support Palliat Care 2022; 12:421-430. [PMID: 35803707 DOI: 10.1136/spcare-2022-003833] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 06/24/2022] [Indexed: 11/04/2022]
Abstract
OBJECTIVES Restriction of raw fruits and vegetables (neutropenic diet) is advised for patients receiving treatment for acute leukaemia in low-income and middle-income countries (LMICs) to reduce infections despite evidence to the contrary from high-income countries. We, therefore, conducted a randomised controlled trial to ascertain the efficacy of the neutropenic diet in an LMIC setting. METHODS Patients aged 1-60 years receiving induction chemotherapy for acute leukaemia were randomised to a regular or neutropenic diet. The study's primary objective was to compare the incidence of major infections among patients receiving the two diets during induction chemotherapy. The secondary objectives were to compare stool microbial flora and induction mortality rates. RESULTS We randomised 200 patients, 98 patients to the regular diet arm and 102 to the neutropenic diet arm. Major infections occurred in 32 (32%) patients in the regular diet arm and 26 (25%) patients in the neutropenic diet arm (p=0.26). There were no statistically significant differences between patients receiving a regular diet versus neutropenic diet for blood culture positivity (n=6 vs 9), inotropic support (17 vs 12), mechanical ventilation (8 vs 5), third-line antibiotic use (28 vs 20), minor infections (12 vs 9), induction mortality (9 vs 4) and remission status (94% vs 94%). The stool culture on day 15 of induction grew multidrug-resistant bacteria in 38% of patients in the regular diet arm and 35% in the neutropenic diet arm (p=0.67). CONCLUSIONS A neutropenic diet did not prevent infections, reduce mortality or change stool microbial flora in patients with acute leukaemia.
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Affiliation(s)
| | | | | | | | - Swaminathan Rajaraman
- Epidemiology, Biostatistics and Cancer Registry, Cancer Institute-WIA, Chennai, Tamil Nadu, India
| | | | - Prasanth Ganesan
- Medical Oncology, Jawaharlal Institute of Postgraduate Medical Education, Puducherry, India
| | - Trivadi S Ganesan
- Sri Ramachandra Institute of Higher Education and Research (Deemed to be University), Chennai, Tamil Nadu, India
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14
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Gopinath P, Veluswami S, Gopisetty G, Sundersingh S, Rajaraman S, Thangarajan R. Identification of tumor biomarkers for pathological complete response to neoadjuvant treatment in locally advanced breast cancer. Breast Cancer Res Treat 2022; 194:207-220. [PMID: 35597840 DOI: 10.1007/s10549-022-06617-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 04/30/2022] [Indexed: 11/26/2022]
Abstract
BACKGROUND Therapeutic response predictors like age, nodal status, and tumor grade and markers, like ER/PR, HER2, and Ki67, are not reliable in predicting the response to a specific form of chemotherapy. The current study aims to identify and validate reliable markers that can predict pathological complete response (pCR) in fluorouracil, epirubicin, and cyclophosphamide (FEC)-based neoadjuvant therapy with (NACT/RT) and without concurrent radiation (NACT). MATERIALS AND METHODS Tandem mass tag (TMT) quantitative liquid chromatography-tandem mass spectrometry (LC-MS/MS) was used to identify differentially expressed proteins from core needle breast biopsy between pCR (n = 4) and no-pCR (n = 4). Immunoblotting of shortlisted proteins with the tissue lysates confirmed the differential expression of the markers. Further, immunohistochemistry (IHC) was performed on formalin-fixed paraffin-embedded sections of treatment-naive core needle biopsies. In the NACT, 29 pCR and 130 no-pCR and in NACT/RT, 32 pCR and 71 no-pCR were used. RESULTS 733 and 807 proteins were identified in NACT and NACT/RT groups, respectively. Ten proteins were shortlisted for validation as potential pCR-predictive markers. THBS1, TNC, and DCN were significantly overexpressed in no-pCR in both the groups. In NACT, CPA3 was significantly upregulated in the no-pCR. In NACT/RT, HnRNPAB was significantly upregulated and HMGB1 significantly downregulated in the no-pCR. HMGB1 was the only marker to show prognostic significance. CONCLUSION Quantitative proteomics followed by IHC identified and validated potential biomarkers for predicting patient response to therapy. These markers can be used, following larger-scale validation, in combination with routine histological analysis providing vital indications of treatment response.
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Affiliation(s)
- Prarthana Gopinath
- Department of Molecular Oncology, Cancer Institute WIA, Chennai, 600036, Tamil Nadu, India
| | - Sridevi Veluswami
- Department of Surgical Oncology, Cancer Institute WIA, Chennai, 600036, Tamil Nadu, India.
| | - Gopal Gopisetty
- Department of Molecular Oncology, Cancer Institute WIA, Chennai, 600036, Tamil Nadu, India.
| | - Shirley Sundersingh
- Department of Oncopatholology, Cancer Institute WIA, Chennai, Tamil Nadu, India
| | - Swaminathan Rajaraman
- Department of Epidemiology, Biostatistics and Cancer Registry, Cancer Institute WIA, Chennai, Tamil Nadu, India
| | - Rajkumar Thangarajan
- Department of Molecular Oncology, Cancer Institute WIA, Chennai, 600036, Tamil Nadu, India
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15
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Azim N, Orrico JF, Appavoo D, Zhai L, Rajaraman S. Polydopamine surface functionalization of 3D printed resin material for enhanced polystyrene adhesion towards insulation layers for 3D microelectrode arrays (3D MEAs). RSC Adv 2022; 12:25605-25616. [PMID: 36320408 PMCID: PMC9493467 DOI: 10.1039/d2ra03911g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 08/16/2022] [Indexed: 12/05/2022] Open
Abstract
3D printing involves the use of photopolymerizable resins, which are toxic and typically have incompatible properties with materials such as polystyrene (PS), which present limitations for biomedical applications. We present a method to dramatically improve the poor adhesion between the PS insulative layer on 3D printed Microelectrode Array (MEA) substrates by functionalizing the resin surface with polydopamine (PDA), a mussel-inspired surface chemistry derivative. A commercial 3D printing prepolymer resin, FormLabs Clear (FLC), was printed using a digital light processing (DLP) printer and then surface functionalized with PDA by alkali-induced aqueous immersion deposition and self-polymerization. It was observed that the adhesion of the PS to FLC was improved due to the precision emanating from the DLP method and further improved after the functionalization of DLP printed substrates with PDA at 1, 12, and 24 h time intervals. The adhesion of PS was evaluated through scotch tape peel testing and instron measurements of planar substrates and incubation testing with qualitative analysis of printed culture wells. The composition and topology of the samples were studied to understand how the properties of the surface change after PDA functionalization and how this contributes to the overall improvement in PS adhesion. Furthermore, the surface energies at each PDA deposition time were calculated from contact angle studies as it related to adhesion. Finally, biocompatibility assays of the newly modified surfaces were performed using mouse cardiac cells (HL-1) to demonstrate the biocompatibility of the PDA functionalization process. PDA surface functionalization of 3D DLP printed FLC resin resulted in a dramatic improvement of thin film PS adhesion and proved to be a biocompatible solution for improving additive manufacturing processes to realize biosensors such as in vitro MEAs. 3D printing involves the use of toxic photopolymerizable resins which typically have incompatible properties with polystyrene for biomedical applications. Herein, we use 3D printing tricks and polydopamine to dramatically improve adhesion.![]()
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Affiliation(s)
- Nilab Azim
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA
- Department of Chemistry, University of Central Florida, Orlando, FL, 32826, USA
| | - Julia Freitas Orrico
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA
| | - Divambal Appavoo
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA
| | - Lei Zhai
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA
- Department of Chemistry, University of Central Florida, Orlando, FL, 32826, USA
| | - Swaminathan Rajaraman
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA
- Department of Materials Science & Engineering, University of Central Florida, Orlando, FL, 32826, USA
- Department of Electrical & Computer Engineering, University of Central Florida, Orlando, FL, 32826, USA
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL, 32826, USA
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16
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Radhakrishnan V, Bhuvan Lagudu PB, Gangopadhyay D, Vijaykumar V, Rajaraman S, Kalaiyarasi JP, Ganesan P, Ganesan TS. Randomized controlled trial of neutropenic diet versus regular diet in patients undergoing induction chemotherapy for acute leukemia. Pediatric Hematology Oncology Journal 2022. [DOI: 10.1016/j.phoj.2022.10.239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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17
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Barani S, Jahan N, Karuppiah M, Chaudhuri S, Raju M, Ponnaiah M, Rajaraman S, Vaidhyalingam V, Ganeshkumar P, Kumar Cp G, Muthappan S, Murugesan J, Srinivasan M, Krishnan U, John Varghese A. Epidemiology of hospital-based COVID- 19 cluster in a tertiary care cancer hospital, Chennai, India 2020. Clin Epidemiol Glob Health 2021; 12:100889. [PMID: 34754984 PMCID: PMC8566092 DOI: 10.1016/j.cegh.2021.100889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 10/05/2021] [Accepted: 10/26/2021] [Indexed: 10/29/2022] Open
Abstract
Objectives To identify risk factors associated with Coronavirus disease 2019 (COVID-19) in a Tertiary care cancer hospital-based cluster and recommend control measures. Methods We conducted tracing and confirmation among hospital and community contacts. We telephonically interviewed and abstracted information from hospital records and registers. We described the cluster by time, place and person. We conducted unmatched case-control study to compare risk factors and computed Odds Ratio (OR) and 95% confidence interval. Results We confirmed COVID-19 in 21 of 1478 tested (1.4%). Secondary attack (%) of COVID-19 among 824 contacts was higher among in-patients of block A (18), household contacts (3.4), housekeeping staff (3.3) and nurses (1.7). The cluster started on April 22 with two successive peaks five days apart and lasted until May 8. Being male, patients aged >33 years [OR = 30·7; 95% CI = 3·6 to 264], having hypertension [OR = 4·3; 95% CI = 1·1 to 16·7] or diabetes [OR = 3·8; 95% CI = 1·0 to 14·1] were associated with COVID-19. Mask compliance was poor (20%) among hospital workers. Discussion We recommended screening of all patients for diabetes and hypertension and isolation/testing of anyone with influenza-like illness for preventing COVID-19 clusters in hospital settings.
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Affiliation(s)
- Suganya Barani
- Hospital Cluster Investigation Team: ICMR-National Institute of Epidemiology, Chennai, India
| | - Nuzrath Jahan
- Hospital Cluster Investigation Team: ICMR-National Institute of Epidemiology, Chennai, India
| | - Mathan Karuppiah
- Hospital Cluster Investigation Team: ICMR-National Institute of Epidemiology, Chennai, India
| | - Sirshendu Chaudhuri
- Hospital Cluster Investigation Team: ICMR-National Institute of Epidemiology, Chennai, India
| | - Mohankumar Raju
- Hospital Cluster Investigation Team: ICMR-National Institute of Epidemiology, Chennai, India
| | - Manickam Ponnaiah
- Hospital Cluster Investigation Team: ICMR-National Institute of Epidemiology, Chennai, India
| | | | | | - Parasuraman Ganeshkumar
- Hospital Cluster Investigation Team: ICMR-National Institute of Epidemiology, Chennai, India
| | - Girish Kumar Cp
- Hospital Cluster Investigation Team: ICMR-National Institute of Epidemiology, Chennai, India
| | - Sendhilkumar Muthappan
- Hospital Cluster Investigation Team: ICMR-National Institute of Epidemiology, Chennai, India
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18
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Didier CM, Kundu A, Rajaraman S. Rapid Makerspace Microfabrication and Characterization of 3D Microelectrode Arrays (3D MEAs) for Organ-on-a-Chip Models. J Microelectromech Syst 2021; 30:853-863. [PMID: 34949905 PMCID: PMC8691745 DOI: 10.1109/jmems.2021.3110163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Integrated sensors in "on-a-chip" in vitro cellular models are a necessity for granularity in data collection required for advanced biosensors. As these models become more complex, the requirement for the integration of electrogenic cells is apparent. Interrogation of such cells, whether alone or within a connected cellular framework, are best achieved with microelectrodes, in the form of a microelectrode array (MEA). Makerspace microfabrication has thus far enabled novel and accessible approaches to meet these demands. Here, resin-based 3D printing, selective multimodal laser micromachining, and simple insulation strategies, define an approach to highly customizable and "on-demand" in vitro 3D MEA-based biosensor platforms. The scalability of this approach is aided by a novel makerspace microfabrication assisted technique denoted using the term Hypo-Rig. The MEA utilizes custom-defined metal microfabricated microelectrodes transitioned from planar (2D) to 3D using the Hypo-Rig. To simulate this transition process, COMSOL modeling is utilized to estimate transitionary forces and angles (with respect to normal). Practically, the Hypo-Rig demonstrated a force of ~40N, as well as a consistent 70° average angular transitionary performance which matched well with the COMSOL model. To illustrate the scalability potential, 3 × 3, 6 × 6, and 8 × 8 versions of the device were fabricated and characterized. The 3D MEAs, demonstrated impedance and phase measurements in the biologically relevant 1 kHz range of 45.4 kΩ, and -34.6° respectively, for polystyrene insulated, ~70μm sized microelectrodes.
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Affiliation(s)
- Charles M Didier
- Burnett School of Biomedical Sciences, and the Nanoscience Technology Center at the University of Central Florida, Orlando, FL 32816, USA
| | - Avra Kundu
- College of Engineering and Computer Science at the University of Central Florida, Orlando, FL 32816, USA
| | - Swaminathan Rajaraman
- Nanoscience Technology Center, the Department of Materials Science and Engineering, the College of Electrical and Computer Engineering, and the Burnett School of Biomedical Sciences at the University of Central Florida, Orlando, FL 32816, USA
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19
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Choi JS, Lee HJ, Rajaraman S, Kim DH. Recent advances in three-dimensional microelectrode array technologies for in vitro and in vivo cardiac and neuronal interfaces. Biosens Bioelectron 2021; 171:112687. [PMID: 33059168 PMCID: PMC7665982 DOI: 10.1016/j.bios.2020.112687] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 08/24/2020] [Accepted: 10/03/2020] [Indexed: 12/13/2022]
Abstract
Three-dimensional microelectrode arrays (3D MEAs) have emerged as promising tools to detect electrical activities of tissues or organs in vitro and in vivo, but challenges in achieving fast, accurate, and versatile monitoring have consistently hampered further advances in analyzing cell or tissue behaviors. In this review, we discuss emerging 3D MEA technologies for in vitro recording of cardiac and neural cellular electrophysiology, as well as in vivo applications for heart and brain health diagnosis and therapeutics. We first review various forms of recent 3D MEAs for in vitro studies in context of their geometry, materials, and fabrication processes as well as recent demonstrations of 3D MEAs to monitor electromechanical behaviors of cardiomyocytes and neurons. We then present recent advances in 3D MEAs for in vivo applications to the heart and the brain for monitoring of health conditions and stimulation for therapy. A brief overview of the current challenges and future directions of 3D MEAs are provided to conclude the review.
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Affiliation(s)
- Jong Seob Choi
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States
| | - Heon Joon Lee
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States
| | - Swaminathan Rajaraman
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826-0120, United States; Department of Electrical & Computer Engineering, University of Central Florida, Orlando, FL, 32816, United States; Department of Materials Science & Engineering, University of Central Florida, Orlando, FL, 32816, United States
| | - Deok-Ho Kim
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States; Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, United States.
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20
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Kundu A, McCoy L, Azim N, Nguyen H, Didier CM, Ausaf T, Sharma AD, Curley JL, Moore MJ, Rajaraman S. Fabrication and Characterization of 3D Printed, 3D Microelectrode Arrays for Interfacing with a Peripheral Nerve-on-a-Chip. ACS Biomater Sci Eng 2020; 7:3018-3029. [PMID: 34275292 DOI: 10.1021/acsbiomaterials.0c01184] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present a nontraditional fabrication technique for the realization of three-dimensional (3D) microelectrode arrays (MEAs) capable of interfacing with 3D cellular networks in vitro. The technology uses cost-effective makerspace microfabrication techniques to fabricate the 3D MEAs with 3D printed base structures with the metallization of the microtowers and conductive traces being performed by stencil mask evaporation techniques. A biocompatible lamination layer insulates the traces for realization of 3D microtower MEAs (250 μm base diameter, 400 μm height). The process has additionally been extended to realize smaller electrodes (30 μm × 30 μm) at a height of 400 μm atop the 3D microtower using laser micromachining of an additional silicon dioxide (SiO2) insulation layer. A 3D microengineered, nerve-on-a-chip in vitro model for recording and stimulating electrical activity of dorsal root ganglion (DRG) cells has further been integrated with the 3D MEA. We have characterized the 3D electrodes for electrical, chemical, electrochemical, biological, and chip hydration stability performance metrics. A decrease in impedance from 1.8 kΩ to 670 Ω for the microtower electrodes and 55 to 39 kΩ for the 30 μm × 30 μm microelectrodes can be observed for an electrophysiologically relevant frequency of 1 kHz upon platinum electroless plating. Biocompatibility assays on the components of the system resulted in a large range (∼3%-70% live cells), depending on the components. Fourier-transform infrared (FTIR) spectra of the resin material start to reveal possible compositional clues for the resin, and the hydration stability is demonstrated in in-vitro-like conditions for 30 days. The fabricated 3D MEAs are rapidly produced with minimal usage of a cleanroom and are fully functional for electrical interrogation of the 3D organ-on-a-chip models for high-throughput of pharmaceutical screening and toxicity testing of compounds in vitro.
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Affiliation(s)
- Avra Kundu
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
| | - Laurie McCoy
- AxoSim, Inc., New Orleans, Louisiana 70112, United States
| | - Nilab Azim
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States.,Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
| | - Hieu Nguyen
- AxoSim, Inc., New Orleans, Louisiana 70112, United States
| | - Charles M Didier
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States.,Burnett School of Biomedical Sciences, University of Central Florida, Orlando, Florida 32827, United States
| | - Tariq Ausaf
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States.,Department of Electrical & Computer Engineering, University of Central Florida, Orlando, Florida 32826, United States
| | - Anup D Sharma
- AxoSim, Inc., New Orleans, Louisiana 70112, United States
| | - J Lowry Curley
- AxoSim, Inc., New Orleans, Louisiana 70112, United States
| | - Michael J Moore
- AxoSim, Inc., New Orleans, Louisiana 70112, United States.,Department of Biomedical Engineering, Tulane University, New Orleans, Louisiana 70118, United States
| | - Swaminathan Rajaraman
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States.,Burnett School of Biomedical Sciences, University of Central Florida, Orlando, Florida 32827, United States.,Department of Electrical & Computer Engineering, University of Central Florida, Orlando, Florida 32826, United States.,Department of Materials Science & Engineering, University of Central Florida, Orlando, Florida 32826, United States
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Miranda-Filho A, Bray F, Charvat H, Rajaraman S, Soerjomataram I. The world cancer patient population (WCPP): An updated standard for international comparisons of population-based survival. Cancer Epidemiol 2020; 69:101802. [PMID: 32942139 PMCID: PMC7768180 DOI: 10.1016/j.canep.2020.101802] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 08/20/2020] [Accepted: 08/22/2020] [Indexed: 01/22/2023]
Abstract
PURPOSE This study addresses the need for a global cancer patient-based standard population that adjusts for the expected age structure of different cancers, thus aiding the comparison of survival estimates worldwide. METHODS Counts of age-specific incidence for 36 cancer sites in 185 countries for the year 2018 were extracted from IARC's GLOBOCAN database of national estimates. We used a multinomial mixture regression to identify clusters of cancer sites with similar age-specific profiles. RESULTS An updated standard entitled the World Cancer Patient Population (WCPP) is presented, derived from the current estimated global numbers of cancer patients that comprises three sets of age-specific weights. Around two-thirds of cancer sites were described by a unique standard, representing the majority of epithelial cancers more often diagnosed at older age groups. The two other standards represent a number of non-epithelial cancer types, and cancers common at younger and older age groups, respectively. CONCLUSION The WCPP proposed here provides a contemporary and global means to estimate age-standardised survival for international benchmarking purposes.
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Affiliation(s)
| | - Freddie Bray
- Section of Cancer Surveillance, International Agency for Research on Cancer, Lyon, France
| | - Hadrien Charvat
- Section of Cancer Surveillance, International Agency for Research on Cancer, Lyon, France
| | - Swaminathan Rajaraman
- Department of Epidemiology, Biostatistics and Cancer Registry, Cancer Institute (WIA), Chennai, India
| | - Isabelle Soerjomataram
- Section of Cancer Surveillance, International Agency for Research on Cancer, Lyon, France
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Hart C, Didier CM, Sommerhage F, Rajaraman S. Biocompatibility of Blank, Post-Processed and Coated 3D Printed Resin Structures with Electrogenic Cells. Biosensors (Basel) 2020; 10:E152. [PMID: 33105886 PMCID: PMC7690614 DOI: 10.3390/bios10110152] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 10/16/2020] [Accepted: 10/19/2020] [Indexed: 12/31/2022]
Abstract
The widespread adaptation of 3D printing in the microfluidic, bioelectronic, and Bio-MEMS communities has been stifled by the lack of investigation into the biocompatibility of commercially available printer resins. By introducing an in-depth post-printing treatment of these resins, their biocompatibility can be dramatically improved up to that of a standard cell culture vessel (99.99%). Additionally, encapsulating resins that are less biocompatible with materials that are common constituents in biosensors further enhances the biocompatibility of the material. This investigation provides a clear pathway toward developing fully functional and biocompatible 3D printed biosensor devices, especially for interfacing with electrogenic cells, utilizing benchtop-based microfabrication, and post-processing techniques.
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Affiliation(s)
- Cacie Hart
- NanoScience Technology Center, University of Central Florida, 12424 Research Parkway, Suite 400, Orlando, FL 32826, USA; (C.H.); (C.M.D.); (F.S.)
- Department of Materials Science & Engineering, University of Central Florida, 12760 Pegasus Dr., Orlando, FL 32816, USA
| | - Charles M. Didier
- NanoScience Technology Center, University of Central Florida, 12424 Research Parkway, Suite 400, Orlando, FL 32826, USA; (C.H.); (C.M.D.); (F.S.)
- Burnett School of Biomedical Science, University of Central Florida, 6900 Lake Nona Blvd, Orlando, FL 32827, USA
| | - Frank Sommerhage
- NanoScience Technology Center, University of Central Florida, 12424 Research Parkway, Suite 400, Orlando, FL 32826, USA; (C.H.); (C.M.D.); (F.S.)
| | - Swaminathan Rajaraman
- NanoScience Technology Center, University of Central Florida, 12424 Research Parkway, Suite 400, Orlando, FL 32826, USA; (C.H.); (C.M.D.); (F.S.)
- Department of Materials Science & Engineering, University of Central Florida, 12760 Pegasus Dr., Orlando, FL 32816, USA
- Burnett School of Biomedical Science, University of Central Florida, 6900 Lake Nona Blvd, Orlando, FL 32827, USA
- Department of Electrical & Computer Engineering, University of Central Florida, 4328 Scorpius St., Orlando, FL 32816, USA
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Didier CM, Kundu A, Shoemaker JT, Vukasinovic J, Rajaraman S. SeedEZ™ Interdigitated Electrodes and Multifunctional Layered Biosensor Composites (MLBCs): A Paradigm Shift in the Development of In Vitro BioMicrosystems. J Microelectromech Syst 2020; 29:653-660. [PMID: 33762802 PMCID: PMC7982987 DOI: 10.1109/jmems.2020.3003452] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We have developed a new technology for the realization of composite biosensor systems, capable of measuring electrical and electrophysiological signals from electrogenic cells, using SeedEZ™ 3D cell culture-scaffold material. This represents a paradigm-shift for BioMEMS processing; 'Biology-Microfabrication' versus the standard 'Microfabrication-Biology' approach. An Interdigitated Electrode (IDE) developed on the 3D cell-scaffold was used to successfully monitor acute cardiomyocyte growth and controlled population decline. We have further characterized processability of the 3D scaffold, demonstrated long-term biocompatibility of the scaffold with various cell lines and developed a multifunctional layered biosensor composites (MLBCs) using SeedEZ™ and other biocompatible substrates for future multilayer sensor integration.
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Affiliation(s)
| | - Avra Kundu
- University of Central Florida, Orlando, FL 32816, USA
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Veeraiah S, Elangovan V, Tripathy JP, Krishnamurthy A, Anand T, Reddy MM, Sudhakar R, K N, Subramani D, Rajaraman S, Elluswami HR, Nirgude A. Quit attempts among tobacco users identified in the Tamil Nadu Tobacco Survey of 2015/2016: a 3 year follow-up mixed methods study. BMJ Open 2020; 10:e034607. [PMID: 32883722 PMCID: PMC7473619 DOI: 10.1136/bmjopen-2019-034607] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 05/29/2020] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES To determine current tobacco use in 2018/2019, quit attempts made and to explore the enablers and barriers in quitting tobacco among tobacco users identified in the Tamil Nadu Tobacco Survey (TNTS) in 2015/2016. SETTING TNTS was conducted in 2015/2016 throughout the state of Tamil Nadu (TN) in India covering 111 363 individuals. Tobacco prevalence was found to be 5.2% (n=5208). PARTICIPANTS All tobacco users in 11 districts of TN identified by TNTS (n=2909) were tracked after 3 years by telephone. In-depth interviews (n=26) were conducted in a subsample to understand the enablers and barriers in quitting. PRIMARY AND SECONDARY OUTCOMES Current tobacco use status, any quit attempt and successful quit rate were the primary outcomes, while barriers and enablers in quitting were considered as secondary outcomes. RESULTS Among the 2909 tobacco users identified in TNTS 2015/2016, only 724 (24.9%) could be contacted by telephone, of which 555 (76.7%) consented. Of those who consented, 210 (37.8%) were currently not using tobacco (ie, successfully quit) and 337 (60.7%) continued to use any form of tobacco. Of current tobacco users, 115 (34.1%) have never made any attempt to quit and 193 (57.3.8%) have made an attempt to quit. Those using smoking form of tobacco products (adjusted relative risk (aRR)=1.2, 95% CI: 1.1 to 1.4) and exposure to smoke at home (aRR=1.2, 95% CI: 1.1 to 1.3) were found to be positively associated with continued tobacco use (failed or no quit attempt). Support from family and perceived health benefits are key enablers, while peer influence, high dependence and lack of professional help are some of the barriers to quitting. CONCLUSION Two-thirds of the tobacco users continue to use tobacco in the last 3 years. While tobacco users are well aware of the ill-effects of tobacco, various intrinsic and extrinsic factors play a major role as a facilitator and lack of the same act as a barrier to quit.
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Affiliation(s)
| | | | - Jaya Prasad Tripathy
- Community Medicine, All India Institute of Medical Sciences - Nagpur, Nagpur, Maharashtra, India
| | | | - Tanu Anand
- Health Research, Indian Council of Medical Research, New Delhi, Delhi, India
| | - Mahendra M Reddy
- Community Medicine, Sri Devaraj Urs Medical College, Sri Devaraj Urs Academy of Higher Education and Research, Kolar, Karnataka, India
| | - Revathy Sudhakar
- Psycho-oncology, Cancer Institute-WIA, Chennai, Tamil Nadu, India
| | - Niraimathi K
- Fenivi Research Solutions, Chennai, Tamil Nadu, India
| | | | - Swaminathan Rajaraman
- Epidemiology, Bio-statistics and Cancer Registry, Cancer Institute (WIA), Chennai, Tamil Nadu, India
| | | | - Abhay Nirgude
- Community Medicine, Yenepoya Medical College Hospital, Mangalore, Karnataka, India
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Radhakrishnan V, Pai V, Rajaraman S, Mehra N, Ganesan T, Dhanushkodi M, Perumal Kalaiyarasi J, Rajan AK, Selvarajan G, Ranganathan R, Karunakaran P, Sagar TG. Olanzapine versus metoclopramide for the treatment of breakthrough chemotherapy-induced vomiting in children: An open-label, randomized phase 3 trial. Pediatr Blood Cancer 2020; 67:e28532. [PMID: 32568452 DOI: 10.1002/pbc.28532] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 06/07/2020] [Accepted: 06/08/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND Breakthrough chemotherapy-induced vomiting (CIV) is defined as CIV occurring after adequate antiemetic prophylaxis. Olanzapine and metoclopramide are two drugs recommended for the treatment of breakthrough CIV in children, without adequate evidence. We conducted an open-label, single-center, phase 3 randomized controlled trial comparing the safety and efficacy of olanzapine and metoclopramide for treating breakthrough CIV. PROCEDURE Children aged 5-18 years who developed breakthrough CIV after receiving highly emetogenic chemotherapy or moderately emetogenic chemotherapy were randomly assigned to the metoclopramide or olanzapine arm. The primary objective of the study was to compare the complete response (CR) rates between patients receiving olanzapine or metoclopramide for treating breakthrough CIV during 72 hours after the administration of the study drug. Secondary objectives were to compare CR rates for nausea and toxicities between the two arms. RESULTS Eighty patients were analyzed (39 in the olanzapine arm and 41 in the metoclopramide arm). CR rates were significantly higher in the olanzapine arm compared with the metoclopramide arm for vomiting (72% vs 39%, P = 0.003) and nausea (59% vs 34%, P = 0.026). Seven patients in the metoclopramide arm crossed over to the olanzapine arm and none crossed over in the olanzapine arm (P < 0.001). The mean nausea score in the olanzapine arm was significantly lower than the metoclopramide arm after the initiation of the rescue antiemetic (P = 0.01). Hyperglycemia and drowsiness were more commonly seen in the olanzapine arm. CONCLUSION Olanzapine is superior to metoclopramide for the treatment of breakthrough CIV in children. Drowsiness and hyperglycemia need to be monitored closely in children receiving olanzapine for breakthrough CIV.
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Affiliation(s)
- Venkatraman Radhakrishnan
- Department of Medical Oncology (Pediatric Oncology Division) and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamilnadu, India
| | - Vishwajeeth Pai
- Department of Medical Oncology (Pediatric Oncology Division) and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamilnadu, India
| | - Swaminathan Rajaraman
- Department of Medical Oncology (Pediatric Oncology Division) and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamilnadu, India
| | - Nikita Mehra
- Department of Medical Oncology (Pediatric Oncology Division) and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamilnadu, India
| | - Trivadi Ganesan
- Department of Medical Oncology (Pediatric Oncology Division) and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamilnadu, India
| | - Manikandan Dhanushkodi
- Department of Medical Oncology (Pediatric Oncology Division) and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamilnadu, India
| | - Jayachandran Perumal Kalaiyarasi
- Department of Medical Oncology (Pediatric Oncology Division) and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamilnadu, India
| | - Arun Kumar Rajan
- Department of Medical Oncology (Pediatric Oncology Division) and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamilnadu, India
| | - Gangothri Selvarajan
- Department of Medical Oncology (Pediatric Oncology Division) and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamilnadu, India
| | - Rama Ranganathan
- Department of Medical Oncology (Pediatric Oncology Division) and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamilnadu, India
| | - Parathan Karunakaran
- Department of Medical Oncology (Pediatric Oncology Division) and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamilnadu, India
| | - Tenali G Sagar
- Department of Medical Oncology (Pediatric Oncology Division) and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamilnadu, India
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Mansoorzare H, Shahraini S, Todi A, Azim N, Khater D, Rajaraman S, Abdolvand R. A Microfluidic MEMS-Microbalance Platform With Minimized Acoustic Radiation in Liquid. IEEE Trans Ultrason Ferroelectr Freq Control 2020; 67:1210-1218. [PMID: 31765308 DOI: 10.1109/tuffc.2019.2955402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
In this article, the microfluidic channels that deliver liquid to a microscale thin-film piezoelectric-on-silicon (TPoS) gravimetric resonant sensor are incorporated into the backside of the silicon-on-insulator (SOI) wafer on which the resonator is fabricated. Specifically, a microwell is embedded at the bottom of the disk -shaped TPoS resonator, while a very thin layer of parylene covering the backside of the resonator and the microwell forms an isolation layer between the liquid and the top device-layer features. In this way, the liquid is in contact with the backside of the resonator, while the device-defining trenches and the electrical connections to the resonator stay clear, thus mitigating the acoustic energy loss and undesirable feedthroughs. The impact of the parylene layer thickness on a few symmetric ( S ) and antisymmetric ( A ) Lamb wave modes of the resonator is experimentally studied, and the performance of such modes in the liquid is characterized by filling the microwells through a PDMS-based microfluidic channel. The parylene layer, while marginally affecting the resonator in the air, is found to substantially enhance its performance in the liquid media. Strong resonance peaks with high quality factors ( Q ) are observed for the S modes, among which Q values above 400 are recorded for a specific mode named S (4, 2) (among the highest ever reported). This article can potentially facilitate the realization of highly stable and sensitive resonant mass sensors (i.e., microbalance) for real-time applications. Additionally, the effect of the acoustic energy radiation in the form of evanescent shear and longitudinal waves in liquid on the Q and resonance frequency of the disk resonators is experimentally validated.
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Rajaraman S, Sornapudi S, Kohli M, Antani S. Assessment of an ensemble of machine learning models toward abnormality detection in chest radiographs. Annu Int Conf IEEE Eng Med Biol Soc 2020; 2019:3689-3692. [PMID: 31946676 DOI: 10.1109/embc.2019.8856715] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Respiratory diseases account for a significant proportion of deaths and disabilities across the world. Chest X-ray (CXR) analysis remains a common diagnostic imaging modality for confirming intra-thoracic cardiopulmonary abnormalities. However, there remains an acute shortage of expert radiologists, particularly in under-resourced settings, resulting in severe interpretation delays. These issues can be mitigated by a computer-aided diagnostic (CADx) system to supplement decision-making and improve throughput while preserving and possibly improving the standard-of-care. Systems reported in the literature or popular media use handcrafted features and/or data-driven algorithms like deep learning (DL) to learn underlying data distributions. The remarkable success of convolutional neural networks (CNN) toward image recognition tasks has made them a promising choice for automated medical image analyses. However, CNNs suffer from high variance and may overfit due to their sensitivity to training data fluctuations. Ensemble learning helps to reduce this variance by combining predictions of multiple learning algorithms to construct complex, non-linear functions and improve robustness and generalization. This study aims to construct and assess the performance of an ensemble of machine learning (ML) models applied to the challenge of classifying normal and abnormal CXRs and significantly reducing the diagnostic load of radiologists and primary-care physicians.
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Didier C, Kundu A, Rajaraman S. Capabilities and limitations of 3D printed microserpentines and integrated 3D electrodes for stretchable and conformable biosensor applications. Microsyst Nanoeng 2020; 6:15. [PMID: 34567630 PMCID: PMC8433388 DOI: 10.1038/s41378-019-0129-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 10/16/2019] [Accepted: 11/18/2019] [Indexed: 05/20/2023]
Abstract
We explore the capabilities and limitations of 3D printed microserpentines (µserpentines) and utilize these structures to develop dynamic 3D microelectrodes for potential applications in in vitro, wearable, and implantable microelectrode arrays (MEAs). The device incorporates optimized 3D printed µserpentine designs with out-of-plane microelectrode structures, integrated on to a flexible Kapton® package with micromolded PDMS insulation. The flexibility of the optimized, printed µserpentine design was calculated through effective stiffness and effective strain equations, so as to allow for analysis of various designs for enhanced flexibility. The optimized, down selected µserpentine design was further sputter coated with 7-70 nm-thick gold and the performance of these coatings was studied for maintenance of conductivity during uniaxial strain application. Bending/conforming analysis of the final devices (3D MEAs with a Kapton® package and PDMS insulation) were performed to qualitatively assess the robustness of the finished device toward dynamic MEA applications. 3D microelectrode impedance measurements varied from 4.2 to 5.2 kΩ during the bending process demonstrating a small change and an example application with artificial agarose skin composite model to assess feasibility for basic transdermal electrical recording was further demonstrated.
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Affiliation(s)
- Charles Didier
- Nanoscience Technology Center (NSTC), University of Central Florida, Orlando, FL 32826 USA
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL 32827 USA
| | - Avra Kundu
- Nanoscience Technology Center (NSTC), University of Central Florida, Orlando, FL 32826 USA
| | - Swaminathan Rajaraman
- Nanoscience Technology Center (NSTC), University of Central Florida, Orlando, FL 32826 USA
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL 32827 USA
- Department of Materials Science & Engineering, University of Central Florida, Orlando, FL 32816 USA
- Department of Electrical & Computer Engineering, University of Central Florida, Orlando, FL 32816 USA
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Hart C, Rajaraman S. Low-Power, Multimodal Laser Micromachining of Materials for Applications in sub-5 µm Shadow Masks and sub-10 µm Interdigitated Electrodes (IDEs) Fabrication. Micromachines (Basel) 2020; 11:mi11020178. [PMID: 32046367 PMCID: PMC7074666 DOI: 10.3390/mi11020178] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 02/04/2020] [Accepted: 02/07/2020] [Indexed: 12/12/2022]
Abstract
Laser micromachining is a direct write microfabrication technology that has several advantages over traditional micro/nanofabrication techniques. In this paper, we present a comprehensive characterization of a QuikLaze 50ST2 multimodal laser micromachining tool by determining the ablation characteristics of six (6) different materials and demonstrating two applications. Both the thermodynamic theoretical and experimental ablation characteristics of stainless steel (SS) and aluminum are examined at 1064 nm, silicon and polydimethylsiloxane (PDMS) at 532 nm, and Kapton® and polyethylene terephthalate at 355 nm. We found that the experimental data aligned well with the theoretical analysis. Additionally, two applications of this multimodal laser micromachining technology are demonstrated: shadow masking down to approximately 1.5 µm feature sizes and interdigitated electrode (IDE) fabrication down to 7 µm electrode gap width.
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Affiliation(s)
- Cacie Hart
- Department of Materials Science & Engineering, University of Central Florida, Orlando, FL 32816, USA;
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32816, USA
| | - Swaminathan Rajaraman
- Department of Materials Science & Engineering, University of Central Florida, Orlando, FL 32816, USA;
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32816, USA
- Department of Electrical & Computer Engineering, University of Central Florida, Orlando, FL 32816, USA
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL 32816, USA
- Correspondence: ; Tel.: +1-407-823-4339
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Morales-Carvajal PM, Kundu A, Didier CM, Hart C, Sommerhage F, Rajaraman S. Makerspace microfabrication of a stainless steel 3D microneedle electrode array (3D MEA) on a glass substrate for simultaneous optical and electrical probing of electrogenic cells. RSC Adv 2020; 10:41577-41587. [PMID: 35516576 PMCID: PMC9057996 DOI: 10.1039/d0ra06070d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Accepted: 10/06/2020] [Indexed: 12/18/2022] Open
Abstract
Microfabrication and assembly of 3D MEA based on a glass-stainless steel platform is shown utilizing non-traditional “Makerspace Microfabrication” techniques featuring cost-effective, rapid fabrication and an assorted biocompatible material palette.
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Affiliation(s)
| | - Avra Kundu
- NanoScience Technology Center (NSTC)
- University of Central Florida
- Orlando
- USA
| | - Charles M. Didier
- NanoScience Technology Center (NSTC)
- University of Central Florida
- Orlando
- USA
- Burnett School of Biomedical Sciences
| | - Cacie Hart
- NanoScience Technology Center (NSTC)
- University of Central Florida
- Orlando
- USA
- Department of Materials Science & Engineering
| | - Frank Sommerhage
- NanoScience Technology Center (NSTC)
- University of Central Florida
- Orlando
- USA
| | - Swaminathan Rajaraman
- NanoScience Technology Center (NSTC)
- University of Central Florida
- Orlando
- USA
- Burnett School of Biomedical Sciences
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Rajaraman S, Candemir S, Xue Z, Alderson PO, Kohli M, Abuya J, Thoma GR, Antani S. A novel stacked generalization of models for improved TB detection in chest radiographs. Annu Int Conf IEEE Eng Med Biol Soc 2019; 2018:718-721. [PMID: 30440497 DOI: 10.1109/embc.2018.8512337] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Chest x-ray (CXR) analysis is a common part of the protocol for confirming active pulmonary Tuberculosis (TB). However, many TB endemic regions are severely resource constrained in radiological services impairing timely detection and treatment. Computer-aided diagnosis (CADx) tools can supplement decision-making while simultaneously addressing the gap in expert radiological interpretation during mobile field screening. These tools use hand-engineered and/or convolutional neural networks (CNN) computed image features. CNN, a class of deep learning (DL) models, has gained research prominence in visual recognition. It has been shown that Ensemble learning has an inherent advantage of constructing non-linear decision making functions and improve visual recognition. We create a stacking of classifiers with hand-engineered and CNN features toward improving TB detection in CXRs. The results obtained are highly promising and superior to the state-of-the-art.
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Kundu A, Nogueira Campos MG, Santra S, Rajaraman S. Precision Vascular Delivery of Agrochemicals with Micromilled Microneedles (µMMNs). Sci Rep 2019; 9:14008. [PMID: 31570804 PMCID: PMC6768873 DOI: 10.1038/s41598-019-50386-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2019] [Accepted: 09/03/2019] [Indexed: 11/16/2022] Open
Abstract
We demonstrate use of makerspace techniques involving subtractive microtechnologies to fabricate micromilled microneedles (µMMNs) of stainless steel (SS) for precise delivery of agrochemicals into vascular bundles of plant tissue. Precision delivery is of immense importance for systemic pathogen control in specific areas of plant tissue. Optimization of the micromilling allows for selective removal of SS at the microscale and the microfabrication of a 5 × 5 array of µMMNs having both base width and height of 500 µm to enable precise puncture into the stem of citrus saplings. Atomic Absorption Spectroscopy reveals up to 7.5× increase in the uptake of a therapeutic cargo while Scanning Electron Microscopy reveals that specific sites of the vascular bundle; either xylem or the phloem can be uniquely targeted with customized µMMNs. Such rapid and cost-effective customization with intricate designs along with scalability is enabled by makerspace microfabrication. Additionally, a 19 × 20 array of micromilled mesoneedles has been fabricated and affixed to a paint roller as an applicator system for real-world field testing outside the laboratory. Initial results indicate reliable behavior of the applicator system and the technique can be applied to the systemic delivery of agrochemicals while conserving the loss of the agrochemical with increased application efficiency.
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Affiliation(s)
- Avra Kundu
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA
| | | | - Swadeshmukul Santra
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA
- Department of Materials Science & Engineering, University of Central Florida, Orlando, FL, 32816, USA
- Department of Chemistry, University of Central Florida, Orlando, FL, 32816, USA
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL, 32827, USA
| | - Swaminathan Rajaraman
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA.
- Department of Materials Science & Engineering, University of Central Florida, Orlando, FL, 32816, USA.
- Department of Electrical & Computer Engineering, University of Central Florida, Orlando, FL, 32816, USA.
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL, 32827, USA.
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Rajashekara S, Subramanian MJ, Rajaraman S, Davila J, Anandasabapathy S. Exploratory analysis of barriers and facilitators to cervical cancer care in rural Tamil Nadu, India. J Clin Oncol 2019. [DOI: 10.1200/jco.2019.37.27_suppl.125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
125 Background: Approximately 20% of cervical cancer deaths worldwide occur in India, most notably in rural areas. The key to addressing the cervical cancer epidemic is early detection and treatment of precancerous cervical lesions. Many studies that assess barriers to cervical cancer care in India focus on individual level factors, such as awareness and education. Given the disparities in cervical cancer in India, particularly between rural and urban settings, a comprehensive, multi-level approach to evaluating barriers and facilitators to care is needed. Methods: In December 2018, we used semi-structured interviews and direct observation of 15 community health workers, medical officers and gynecologic oncologists to explore the multi-level barriers and facilitators to cervical cancer care in rural Tamil Nadu. Data collection occurred within an existing organized cervical cancer screening program and was guided by the social-ecological model. Results: Barriers and facilitators to cervical cancer screening and treatment of precancerous lesions were identified at all levels of the social-ecological model. Barriers included fear of and travel distance to urban centers for treatment (individual), limited social support (interpersonal), lack of rural clinical facilities that provide treatment (organizational), competing community health initiatives (community), and lack of cohesive national screening and treatment guidelines (policy). Facilitators included travel distance to local screening services (individual), access to community health workers (interpersonal), institutional initiatives to increase screening access (organizational), mass awareness campaigns (community), and Tamil Nadu State priorities to improve cervical cancer care (policy). Conclusions: This assessment underscores the gap between cervical cancer screening and treatment in rural Tamil Nadu. This data will inform the development of a multi-faceted intervention, targeting all levels of the social-ecological model, to improve the linkage between cervical cancer screening and treatment for precancerous cervical lesions to decrease the burden of disease and mortality in India.
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Radhakrishnan V, Joshi A, Ramamoorthy J, Rajaraman S, Ganesan P, Ganesan TS, Dhanushkodi M, Sagar TG. Intravenous fosaprepitant for the prevention of chemotherapy-induced vomiting in children: A double-blind, placebo-controlled, phase III randomized trial. Pediatr Blood Cancer 2019; 66:e27551. [PMID: 30426714 DOI: 10.1002/pbc.27551] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 10/11/2018] [Accepted: 10/25/2018] [Indexed: 11/07/2022]
Abstract
BACKGROUND Fosaprepitant is a neurokinin-1 receptor antagonist, approved for the prevention of chemotherapy-induced nausea and vomiting. The data on the use of fosaprepitant in children are limited and therefore we conducted a phase III randomized controlled trial. PROCEDURE Children aged 1-12 years scheduled to receive moderately or highly emetogenic chemotherapy were randomly assigned to arm-A (fosaprepitant) or arm-B (placebo). Children recruited to arm-A received intravenous ondansetron plus dexamethasone followed by fosaprepitant infusion. Children recruited to arm-B received the same drugs as those given to children in arm-A, except that fosaprepitant was substituted with a placebo. Ondansetron and dexamethasone were continued for 48 hours after completion of chemotherapy. The primary end point of the study was to determine the proportion of patients who achieved a complete response (CR), defined as no vomiting, no retching, and no use of rescue medication, during the 24-120 hours (delayed phase) after administration of the last dose of chemotherapy. Secondary end points were the proportion of patients who achieved a CR during the acute phase (0-24 hours) and overall after administration of the last dose of chemotherapy. RESULTS One-hundred-sixty-three patients were analyzed (81 in the fosaprepitant arm and 82 in the placebo arm). CR rates were significantly higher in the fosaprepitant arm compared to those in the placebo arm during the acute phase (86% vs 60%, P < 0.001), delayed phase (79% vs 51%, P < 0.001), and overall phase (70% vs 41%, P < 0.001). Three (4%) patients in the fosaprepitant arm and sixteen (20%) in the placebo arm required rescue anti-emetics (P = 0.0017). CONCLUSION Addition of fosaprepitant to ondansetron and dexamethasone improved chemotherapy-induced vomiting control in children treated with moderately or highly emetogenic chemotherapy.
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Affiliation(s)
- Venkatraman Radhakrishnan
- Department of Medical Oncology (Pediatric Oncology Division), Cancer Institute (WIA), Chennai, India
| | - Archit Joshi
- Department of Medical Oncology (Pediatric Oncology Division), Cancer Institute (WIA), Chennai, India
| | - Jaikumar Ramamoorthy
- Department of Medical Oncology (Pediatric Oncology Division), Cancer Institute (WIA), Chennai, India
| | | | - Prasanth Ganesan
- Department of Medical Oncology (Pediatric Oncology Division), Cancer Institute (WIA), Chennai, India
| | - Trivadi S Ganesan
- Department of Medical Oncology (Pediatric Oncology Division), Cancer Institute (WIA), Chennai, India
| | - Manikandan Dhanushkodi
- Department of Medical Oncology (Pediatric Oncology Division), Cancer Institute (WIA), Chennai, India
| | - Tenali G Sagar
- Department of Medical Oncology (Pediatric Oncology Division), Cancer Institute (WIA), Chennai, India
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Kundu A, Nattoo C, Fremgen S, Springer S, Ausaf T, Rajaraman S. Optimization of makerspace microfabrication techniques and materials for the realization of planar, 3D printed microelectrode arrays in under four days. RSC Adv 2019; 9:8949-8963. [PMID: 35517709 PMCID: PMC9062012 DOI: 10.1039/c8ra09116a] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Accepted: 03/11/2019] [Indexed: 12/24/2022] Open
Abstract
Conventional two-dimensional microelectrode arrays (2D MEAs) in the market involve long manufacturing timeframes, have cleanroom requirements, and need to be assembled from multiple parts to obtain the final packaged device. For MEAs to be “used and tossed”, manufacturing has to be moved from the cleanroom to makerspaces. In order to enable makerspace fabricated MEAs comparable to conventional MEAs, the microfabrication processes must be optimized to have similar electrical properties along with biocompatibility and number of recording sites. This work presents a makerspace microfabricated 2D MEA having electrode densities up to a commercially popular 8 × 8 array, all fabricated under four days. Additive manufacturing-based realization of the MEA devices provides immense flexibility in terms of meeting distinct design requirements. A unique non-planar MEA having meso-scale electrodes on the top side of a chip transitioning to traces onto the bottom side through electrical vias is presented in this work. This allows for (a) monolithic integration of a culture well for devices having up to a 6 × 6 MEA array, (b) selective electroplating of the meso-scale electrodes (500 μm diameter) defined by silver ink casting followed by pulsed electroplating of gold or platinum without any masking procedure, (c) casting of a uniform and planar insulation layer via a novel process of confined precision spin coating (CPSC) of SU-8 which acts as a biocompatible insulation atop the meso-scale electrodes; and (d) selective laser micromachining to define the 50 μm × 50 μm microelectrodes. For an 8 × 8 array, the culture well and MEA chip framework are 3D printed as two separate parts and sealed together with a biocompatible epoxy as in commercially available MEAs. The fabricated MEAs have an average 1 kHz impedance of 36.8 kΩ/16 kΩ with a double layer capacitance of 400 nF cm−2/520 nF cm−2 for nano-porous platinum/nano-gold which is comparable to the state-of-art commercially available 2D MEAs. Additionally, it was found out that our 3D printing-based process compares very favorably with traditional glass MEAs in terms of design to device while representing a dramatic reduction in cost, timeline for fabrication, reduction in the number of steps and the need for sophisticated microfabrication and packaging equipment. “Makerspace microfabrication” with the use of simple tools and materials is used to demonstrate the realization of 2D microelectrode arrays (MEAs) having a density of up to 8 × 8 MEAs in under four days which are comparable to conventional MEAs.![]()
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Affiliation(s)
- Avra Kundu
- NanoScience Technology Center (NSTC)
- University of Central Florida
- Orlando
- USA
| | - Crystal Nattoo
- Department of Electrical and Computer Engineering
- University of Miami
- Coral Gables
- USA
| | - Sarah Fremgen
- NanoScience Technology Center (NSTC)
- University of Central Florida
- Orlando
- USA
| | - Sandra Springer
- NanoScience Technology Center (NSTC)
- University of Central Florida
- Orlando
- USA
| | - Tariq Ausaf
- NanoScience Technology Center (NSTC)
- University of Central Florida
- Orlando
- USA
- Department of Electrical & Computer Engineering
| | - Swaminathan Rajaraman
- NanoScience Technology Center (NSTC)
- University of Central Florida
- Orlando
- USA
- Department of Electrical & Computer Engineering
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J. Varma S, Sambath Kumar K, Seal S, Rajaraman S, Thomas J. Fiber-Type Solar Cells, Nanogenerators, Batteries, and Supercapacitors for Wearable Applications. Adv Sci (Weinh) 2018; 5:1800340. [PMID: 30250788 PMCID: PMC6145419 DOI: 10.1002/advs.201800340] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 04/13/2018] [Indexed: 05/20/2023]
Abstract
Wearable electronic devices represent a paradigm change in consumer electronics, on-body sensing, artificial skins, and wearable communication and entertainment. Because all these electronic devices require energy to operate, wearable energy systems are an integral part of wearable devices. Essentially, the electrodes and other components present in these energy devices should be mechanically strong, flexible, lightweight, and comfortable to the user. Presented here is a critical review of those materials and devices developed for energy conversion and storage applications with an objective to be used in wearable devices. The focus is mainly on the advances made in the field of solar cells, triboelectric generators, Li-ion batteries, and supercapacitors for wearable device development. As these devices need to be attached/integrated with the fabric, the discussion is limited to devices made in the form of ribbons, filaments, and fibers. Some of the important challenges and future directions to be pursued are also highlighted.
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Affiliation(s)
- Sreekanth J. Varma
- NanoScience Technology CenterUniversity of Central FloridaOrlandoFL32826USA
| | - Kowsik Sambath Kumar
- NanoScience Technology CenterUniversity of Central FloridaOrlandoFL32826USA
- Department of Materials Science & EngineeringUniversity of Central FloridaOrlandoFL32826USA
| | - Sudipta Seal
- NanoScience Technology CenterUniversity of Central FloridaOrlandoFL32826USA
- Department of Materials Science & EngineeringUniversity of Central FloridaOrlandoFL32826USA
- Advanced Materials Processing Analysis CenterUniversity of Central FloridaOrlandoFL32826USA
| | - Swaminathan Rajaraman
- NanoScience Technology CenterUniversity of Central FloridaOrlandoFL32826USA
- Department of Materials Science & EngineeringUniversity of Central FloridaOrlandoFL32826USA
- BRIDG—Bridging the Innovation Development Gap200 NeoCity WayNeoCityFL34744USA
- Department of Electrical & Computer EngineeringUniversity of Central FloridaOrlandoFL32826USA
| | - Jayan Thomas
- NanoScience Technology CenterUniversity of Central FloridaOrlandoFL32826USA
- Department of Materials Science & EngineeringUniversity of Central FloridaOrlandoFL32826USA
- CREOLThe College of Optics and PhotonicsUniversity of Central FloridaOrlandoFL32816USA
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Ganesan P, Sagar TG, Kannan K, Radhakrishnan V, Rajaraman S, John A, Sundersingh S, Mahajan V, Ganesan TS. Long-term outcome of diffuse large B-cell lymphoma: Impact of biosimilar rituximab and radiation. Indian J Cancer 2018; 54:430-435. [PMID: 29469072 DOI: 10.4103/ijc.ijc_241_17] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
INTRODUCTION Rituximab (R)-CHOP improves survival over CHOP in diffuse large B-cell lymphoma (DLBCL). The availability of biosimilar rituximab in India has increased access of this drug. We report on the impact of treatment on outcomes with special emphasis on the impact of biosimilar rituximab and radiation. METHODS Outcomes of adults (age 15-60 years) treated with CHOP+/- Rituximab radiation were analyzed retrospectively to look at baseline features, treatment, and event-free and overall survival (EFS and OS). RESULTS In the period 2000-2013, 444 patients (median age 47 years: 15-60; males: 288 [65%]; Stage III/IV: 224 [50%]; age-adjusted international prognostic index [aaIPI] Score 2 or 3 in 50%) received either CHOP (n = 325 [73%]) or RCHOP (n = 119 [27%]) therapy. Biosimilar rituximab and the original were used in 95 (80%) and 24 (20%) patients, respectively. Radiation was given in 134 (30%) patients (Stages I and II, 100/220 [45%] and Stages III and IV, 34/224 [15%]). After a median follow-up of 46 (0.2-126) months, the 5-year EFS and OS were 59% and 68%, respectively. The factors predicting inferior EFS and OS were age> 40 years, performance status 2-4, Stage III/IV, hemoglobin <12 g/dL, the aaIPI Score 2 or 3, and nonuse of rituximab and radiation. Radiation used in early stage disease benefitted all subgroups regardless of bulky disease, use of rituximab, or the number of cycles of chemotherapy. Addition of rituximab improved survival across all categories of aaIPI. CONCLUSION Availability of biosimilar rituximab has increased access and survival of patients with DLBCL in India. Radiotherapy improved outcomes in early stages.
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Affiliation(s)
- P Ganesan
- Department of Medical Oncology, Cancer Institute (WIA), Adyar, Chennai, Tamil Nadu, India
| | - T G Sagar
- Department of Medical Oncology, Cancer Institute (WIA), Adyar, Chennai, Tamil Nadu, India
| | - K Kannan
- Department of Medical Oncology, Cancer Institute (WIA), Adyar, Chennai, Tamil Nadu, India
| | - V Radhakrishnan
- Department of Medical Oncology, Cancer Institute (WIA), Adyar, Chennai, Tamil Nadu, India
| | - S Rajaraman
- Department of Cancer Registry Registry and Biostatistics, Cancer Institute (WIA), Adyar, Chennai, Tamil Nadu, India
| | - A John
- Department of Radiation Oncology, Cancer Institute (WIA), Adyar, Chennai, Tamil Nadu, India
| | - S Sundersingh
- Department of Pathology, Cancer Institute (WIA), Adyar, Chennai, Tamil Nadu, India
| | - V Mahajan
- Department of Radiology, Cancer Institute (WIA), Adyar, Chennai, Tamil Nadu, India
| | - T S Ganesan
- Department of Medical Oncology, Cancer Institute (WIA), Adyar, Chennai, Tamil Nadu, India
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Joshi A, Radhakrishnan V, Ramamoorthy J, Ganesan TS, Rajaraman S, Ganesan P, Dhanushkodi M, Sagar TG. Intravenous fosaprepitant for the prevention of chemotherapy induced vomiting in children: A double blind placebo controlled, phase III randomized trial. J Clin Oncol 2018. [DOI: 10.1200/jco.2018.36.15_suppl.10527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Kundu A, Ausaf T, Rajaraman S. 3D Printing, Ink Casting and Micromachined Lamination (3D PICLμM): A Makerspace Approach to the Fabrication of Biological Microdevices. Micromachines (Basel) 2018; 9:E85. [PMID: 30393360 PMCID: PMC6187583 DOI: 10.3390/mi9020085] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 02/07/2018] [Accepted: 02/11/2018] [Indexed: 11/17/2022]
Abstract
We present a novel benchtop-based microfabrication technology: 3D printing, ink casting, micromachined lamination (3D PICLμM) for rapid prototyping of lab-on-a-chip (LOC) and biological devices. The technology uses cost-effective, makerspace-type microfabrication processes, all of which are ideally suited for low resource settings, and utilizing a combination of these processes, we have demonstrated the following devices: (i) 2D microelectrode array (MEA) targeted at in vitro neural and cardiac electrophysiology, (ii) microneedle array targeted at drug delivery through a transdermal route and (iii) multi-layer microfluidic chip targeted at multiplexed assays for in vitro applications. The 3D printing process has been optimized for printing angle, temperature of the curing process and solvent polishing to address various biofunctional considerations of the three demonstrated devices. We have depicted that the 3D PICLμM process has the capability to fabricate 30 μm sized MEAs (average 1 kHz impedance of 140 kΩ with a double layer capacitance of 3 μF), robust and reliable microneedles having 30 μm radius of curvature and ~40 N mechanical fracture strength and microfluidic devices having 150 μm wide channels and 400 μm fluidic vias capable of fluid mixing and transmitted light microparticle visualization. We believe our 3D PICLμM is ideally suited for applications in areas such as electrophysiology, drug delivery, disease in a dish, organ on a chip, environmental monitoring, agricultural therapeutic delivery and genomic testing.
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Affiliation(s)
- Avra Kundu
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL 32826, USA.
| | - Tariq Ausaf
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL 32826, USA.
- Department of Electrical & Computer Engineering, University of Central Florida, Orlando, FL 32826, USA.
| | - Swaminathan Rajaraman
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL 32826, USA.
- Department of Electrical & Computer Engineering, University of Central Florida, Orlando, FL 32826, USA.
- Bridging the Innovation Development Gap (BRIDG), Neo City, FL 34744, USA.
- Department of Material Science & Engineering, University of Central Florida, Orlando, FL 32826, USA.
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Fremgen S, Springer S, Kundu A, Rajaraman S. Comparison of the Technical Capabilities of Traditional Glass Surface Micromachining/Chip-on-Board and 3D Printing-based Microfabrication Technologies Utilizing a Microelectrode Array (MEA) as a Platform Device. Front Cell Neurosci 2018. [DOI: 10.3389/conf.fncel.2018.38.00093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Springer S, Fremgen S, Rajaraman S. Building a Modified Replicating Rapid-Prototyping Printer (RepRap) for Extrusion BioPlotting of Cardiomyocytes atop Planar Microelectrode Arrays (MEAs). Front Cell Neurosci 2018. [DOI: 10.3389/conf.fncel.2018.38.00065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Abstract
PURPOSE Cancer-related stigma influences the way people perceive cancer, which renders cancer control-beginning with prevention and proceeding to palliation-a challenging task. This study aimed to assess the current levels of awareness and perceptions about cancer among people with various socioeconomic status and diverse backgrounds in the city of Chennai, India. PATIENTS AND METHODS The sample population (N = 2,981; 18 to 88 years of age) was stratified into four groups: patients (n = 510), caregivers (n = 494) consulting at the Cancer Institute (Women Indian Association), college students (n = 978), and general public (n = 999). Fourteen statements related to cancer stigma or myths were identified and categorized by awareness (10 items) or perception (4 items). Responses to those statements were recorded by using a Likert scale (yes, no, and don't know). The data were described by frequency analysis and χ2 test using SPSS Version 13 (SPSS, Chicago, IL). RESULTS More than 70% of the study participants were aware that cancer is curable, that cancer is not contagious, and that cancer is not a curse or a death sentence. However, only approximately half believed that surgery or biopsy do not cause cancer to spread to other organs or that radiation therapy does not consist of receiving an electric shock. Higher education, younger age, male sex, personal experience with cancer (either as a patient or caregiver), and high socioeconomic status were the categories of people with increased awareness about cancer. CONCLUSION These factors need to be taken into consideration in tailoring information, education, and communication campaigns. Resource allocation for these campaigns is an investment in cancer control.
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Affiliation(s)
| | | | - Barsha Basumalik
- All authors: Cancer Institute (Women Indian Association), Chennai, India
| | - Dhivya Pandian
- All authors: Cancer Institute (Women Indian Association), Chennai, India
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Patel YA, Willsie A, Clements IP, Aguilar R, Rajaraman S, Butera RJ. Microneedle cuff electrodes for extrafascicular peripheral nerve interfacing. Annu Int Conf IEEE Eng Med Biol Soc 2017; 2016:1741-1744. [PMID: 28268663 DOI: 10.1109/embc.2016.7591053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE The work presented here describes a new tool for peripheral nerve interfacing, called the microneedle cuff (μN-cuff) electrode. APPROACH μN arrays are designed and integrated into cuff electrodes for penetrating superficial tissues while remaining non-invasive to delicate axonal tracts. MAIN RESULTS In acute testing, the presence of 75 μm height μNs decreased the electrode-tissue interface impedance by 0.34 kΩ, resulting in a 0.9 mA reduction in functional stimulation thresholds and increased the signal-to-noise ratio by 9.1 dB compared to standard (needle-less) nerve cuff electrodes. Preliminary acute characterization suggests that μN-cuff electrodes provide the stability and ease of use of standard cuff electrodes while enhancing electrical interfacing characteristics. SIGNIFICANCE The ability to stimulate, block, and record peripheral nerve activity with greater specificity, resolution, and fidelity can enable more precise spatiotemporal control and measurement of neural circuits.
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Guvanasen GS, Guo L, Aguilar RJ, Cheek AL, Shafor CS, Rajaraman S, Nichols TR, DeWeerth SP. A Stretchable Microneedle Electrode Array for Stimulating and Measuring Intramuscular Electromyographic Activity. IEEE Trans Neural Syst Rehabil Eng 2017; 25:1440-1452. [DOI: 10.1109/tnsre.2016.2629461] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Karnati C, Aguilar R, Arrowood C, Ross J, Rajaraman S. Micromachining on and of Transparent Polymers for Patterning Electrodes and Growing Electrically Active Cells for Biosensor Applications. Micromachines (Basel) 2017; 8:E250. [PMID: 30400441 PMCID: PMC6190309 DOI: 10.3390/mi8080250] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 07/28/2017] [Accepted: 08/02/2017] [Indexed: 11/17/2022]
Abstract
We report on microfabrication and assembly process development on transparent, biocompatible polymers for patterning electrodes and growing electrically active cells for in vitro cell-based biosensor applications. Such biosensors are typically fabricated on silicon or glass wafers with traditional microelectronic processes that can be cost-prohibitive without imparting necessary biological traits on the devices, such as transparency and compatibility for the measurement of electrical activity of electrogenic cells and other biological functions. We have developed and optimized several methods that utilize traditional micromachining and non-traditional approaches such as printed circuit board (PCB) processing for fabrication of electrodes and growing cells on the transparent polymers polyethylene naphthalate (PEN) and polyethylene terephthalate (PET). PEN-based biosensors are fabricated utilizing lithography, metal lift-off, electroplating, wire bonding, inkjet printing, conformal polymer deposition and laser micromachining, while PET-based biosensors are fabricated utilizing post-processing technologies on modified PCBs. The PEN-based biosensors demonstrate 85⁻100% yield of microelectrodes, and 1-kHz impedance of 59.6 kOhms in a manner comparable to other traditional approaches, with excellent biofunctionality established with an ATP assay. Additional process characterization of the microelectrodes depicts expected metal integrity and trace widths and thicknesses. PET-based biosensors are optimized for a membrane bow of 6.9 to 15.75 µm and 92% electrode yield on a large area. Additional qualitative optical assay for biomaterial recognition with transmitted light microscopy and growth of rat cortical cells for 7 days in vitro (DIV) targeted at biological functionalities such as electrophysiology measurements are demonstrated in this paper.
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Affiliation(s)
| | | | | | - James Ross
- Axion BioSystems Inc., Atlanta, GA 30309, USA.
| | - Swaminathan Rajaraman
- NanoScience Technology Center and Bridging the Innovation Development Gap (BRIDG), Departments of Material Science and Engineering and Electrical and Computer Engineering, University of Central Florida, Orlando, FL 32826, USA.
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Dhanushkodi M, Mitra T, Ranganathan R, Radhakrishnan V, Ganesan P, Rathnam K, Ganesarajah S, Rajaraman S, Tenali Gnana S, Sinha S, Ganesan T. A novel mathematical approach to predict outcome in adult Hodgkin lymphoma. J Clin Oncol 2016. [DOI: 10.1200/jco.2016.34.15_suppl.e19016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | - Tanmay Mitra
- Institute of Mathematical Sciences, Chennai, India
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Ganesan P, Rajendranath R, Kannan K, Radhakrishnan V, Ganesan TS, Udupa K, Lakshmipathy KM, Mahajan V, Sundersingh S, Rajaraman S, Krishnakumar R, Sagar TG. Phase II study of interim PET-CT-guided response-adapted therapy in advanced Hodgkin's lymphoma. Ann Oncol 2015; 26:1170-1174. [PMID: 25701453 DOI: 10.1093/annonc/mdv077] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 02/09/2015] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Combination chemotherapy ABVD (doxorubicin, bleomycin, vinblastine and dacarabazine) cures ∼70% of patients with advanced Hodgkin's lymphoma (aHL, stages IIB, III and IV) while more toxic escalated BEACOPP (EB, combination of bleomycin, etoposide, doxorubicin, cyclophosphamide, vincristine, procarbazine and prednisolone) increases cure rates to 85%. Patients with a positive interim positron emission tomography-computerized tomography (PET-CT) scan after two cycles (PET-2) of ABVD have very poor outcomes with continued ABVD. Intensifying therapy with EB in PET-2-positive patients ('response-adapted therapy') may improve cure rates, whereas the negative patients can continue ABVD alone. PATIENTS AND METHODS Eligible patients with newly diagnosed aHL received two cycles of ABVD and underwent PET-2 (scored with semi-quantitative 5-point visual criteria, 'Deauville score'). PET-2-negative patients continued four additional cycles of ABVD, whereas PET-2-positive patients received four cycles of EB. A phase II sample size of 50 was estimated keeping the lower and higher proportion of rejection of the event-free survival (EFS) as 70% and 85%, respectively. RESULTS Fifty patients [median age 28 (12-60) years; male : female: 39 : 11; stages: IIB-3 (6%), III-29 (58%) and IV-18 (36%); International Prognostic Score (IPS): 0-3: 34 (68%); 4-7: 16 (32%)] were enrolled; 49 underwent PET-2. Eight (16%) were PET-2-positive, whereas 41 (84%) were negative. Forty-seven were evaluable for EFS and all 50 for overall survival (OS). The 2-year EFS was 76% (95% CI: 68-83) and OS was 88% (95% CI: 82-94). PET-2 was strongly prognostic-2-year EFS, negative versus positive: 82% versus 50%; P = 0.013. CONCLUSION PET-2 response-adapted strategy could not achieve EFS of 85% in aHL. However, escalated therapy improved outcomes in PET-2-positive patients compared with historical data. TRIAL REGISTRATION CTRI/2012/06/002741 (http://www.ctri.nic.in) and NCT01304849 (http://www.clinicaltrials.gov).
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Affiliation(s)
| | | | | | | | | | - K Udupa
- Department of Medical Oncology
| | | | | | | | - S Rajaraman
- Department of Tumor Registry, Cancer Institute (WIA), Chennai, India
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48
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Abstract
Our previous studies have shown PTH to be an effective relaxant of smooth muscle throughout the mammalian tract. Recently, we found PTHrP to be equally as potent and effective on the gut as PTH, and we hypothesized that PTHrP, rather than PTH, might be the natural ligand for the gut receptors which mediate GI smooth muscle relaxation. To approach this question, we asked whether rat GI tissue expresses mRNA for PTHrP. Using selective reverse transcription and PCR we have found PTHrP mRNA in smooth muscle throughout the rat GI tract and in gastric and colonic mucosa as well. Our findings support the idea that PTHrP can be produced by GI tissues and that it may function there as an autocrine or paracrine factor. One of its actions may involve regulation of GI muscle tone.
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Affiliation(s)
- C W Cooper
- Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston
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49
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Wang PC, Wester BA, Rajaraman S, Paik SJ, Kim SH, Allen MG. Hollow polymer microneedle array fabricated by photolithography process combined with micromolding technique. Annu Int Conf IEEE Eng Med Biol Soc 2010; 2009:7026-9. [PMID: 19964192 DOI: 10.1109/iembs.2009.5333317] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Transdermal drug delivery through microneedles is a minimally invasive procedure causing little or no pain, and is a potentially attractive alternative to intramuscular and subdermal drug delivery methods. This paper demonstrates the fabrication of a hollow microneedle array using a polymer-based process combining UV photolithography and replica molding techniques. The key characteristic of the proposed fabrication process is to define a hollow lumen for microfluidic access via photopatterning, allowing a batch process as well as high throughput. A hollow SU-8 microneedle array, consisting of 825mum tall and 400 mum wide microneedles with 15-25 mum tip diameters and 120 mum diameter hollow lumens was designed, fabricated and characterized.
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Affiliation(s)
- Po-Chun Wang
- School of Electrical and Computer Engineering of Georgia Institute of Technology, Atlanta, GA 30332, USA.
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50
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Gani A, Gribok A, Rajaraman S, Ward W, Reifman J. Predicting Subcutaneous Glucose Concentration in Humans: Data-Driven Glucose Modeling. IEEE Trans Biomed Eng 2009; 56:246-54. [DOI: 10.1109/tbme.2008.2005937] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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