1
|
Shaik IH, Chaphekar N, Vasudevan V, Alshabi A, Bastian JR, Zhao W, Caritis S, Venkataramanan R. Effect of Formulation and Route of administration on the distribution of 17-Hydroxyprogesterone Caproate in Rats. Xenobiotica 2023:1-8. [PMID: 37039113 DOI: 10.1080/00498254.2023.2201348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
Abstract
Weekly intramuscular (250 mg/week) or subcutaneous (275 mg/week) injections of 17-hydroxyprogesterone caproate (17-OHPC) is the only treatment option for the prevention of preterm birth in women with a prior history of preterm delivery.The objective of the current study was to determine the relative distribution of 17-OHPC in selected tissues in adult female SD rats after IM (oily formulation or solution), IV (solution), PO (solution) or intravaginal (suppository) administration.Plasma, uterus, adipose, and liver samples were collected at various times and analyzed by LC-MS-MS.Highest concentrations of 17-OHPC were observed in the adipose tissue, after IM (oily formulation), and intravaginal administration.Substantial concentrations of 17-OHPC were also observed in the uterus after IM, intravaginal and IV administration.17-OHPC was not detected in the liver and in any of the tissues after PO administration.17-OHPC levels in plasma after intravaginal suppository administration were low despite substantial concentrations being observed in the adipose and the uterus.The distribution of 17-OHPC depends on the formulation, the route of administration and the sampling time.Low systemic concentrations and substantial distribution in the tissues of interest after intravaginal administration warrants future studies to evaluate the potential of the daily intravaginal route of administration of 17-OHPC.
Collapse
Affiliation(s)
- Imam H Shaik
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Pharmacy and Therapeutics, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Nupur Chaphekar
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Vignesh Vasudevan
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Ali Alshabi
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
- Clinical Pharmacy Department, College of Pharmacy, Najran University, Najran, Saudi Arabia
| | - Jaime R Bastian
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Obstetrics, Gynecology and Reproductive Sciences, School of Medicine, UPMC Magee-Women's Hospital, Pittsburgh, Pennsylvania
| | - Wenchen Zhao
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Steve Caritis
- Department of Obstetrics, Gynecology and Reproductive Sciences, School of Medicine, UPMC Magee-Women's Hospital, Pittsburgh, Pennsylvania
- Magee-Women's Research Institute, Pittsburgh, Pennsylvania
| | - Raman Venkataramanan
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Pathology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
- Magee-Women's Research Institute, Pittsburgh, Pennsylvania
| |
Collapse
|
2
|
Hansen-Estruch C, Bikhet MH, Shaik IH, Vasudevan V, Zhao W, Javed M, Collins DE, Ayares D, Judd E, Cooper DKC, Venkataramanan R. Assessment of glomerular filtration and tubular secretion in baboons with life-supporting pig kidney grafts. Xenotransplantation 2023; 30:e12795. [PMID: 36820525 PMCID: PMC10354795 DOI: 10.1111/xen.12795] [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: 09/09/2022] [Revised: 11/22/2022] [Accepted: 01/26/2023] [Indexed: 02/24/2023]
Abstract
With pig kidney xenotransplantation nearing clinical reality, it is imperative to measure pig kidney function in the graft recipients. Our aims were (i) to compare inulin clearance after a short intravenous (IV) bolus with steady-state inulin IV infusion, (ii) to use this method to measure the glomerular filtration rate (GFR), and (iii) to determine the tubular secretory function using cefoxitin in a pig-to-baboon renal transplant model. A short IV infusion of inulin and cefoxitin were followed by a maintenance IV infusion of inulin over 5 h in seven healthy baboons, three healthy pigs, and five baboons after bilateral native nephrectomy and intra-abdominal pig renal transplantation. Blood and urine samples were collected. Serum and urinary inulin and serum cefoxitin concentrations measured by validated assays were used to calculate GFR and renal secretion. GFR calculated were similar by both methods. The body weight normalized total body clearance of inulin was similar in pigs and baboons despite differences in absolute clearances. Pig kidney transplanted into baboons provided similar clearance in baboons when normalized to baboon body weight and sustained filtration and secretory functions. The study documented that pig kidneys support the physiologic needs of baboons and are likely to support human recipients as well.
Collapse
Affiliation(s)
- Christophe Hansen-Estruch
- Xenotransplantation Program, Department of Surgery, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Mohamed H. Bikhet
- Xenotransplantation Program, Department of Surgery, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Imam H. Shaik
- Clinical Pharmacokinetics Laboratory, University of Pittsburgh School of Pharmacy, Pittsburgh, Pennsylvania, USA
- Department of Pharmacy and Therapeutics, University of Pittsburgh School of Pharmacy, Pittsburgh, Pennsylvania, USA
| | - Vignesh Vasudevan
- Clinical Pharmacokinetics Laboratory, University of Pittsburgh School of Pharmacy, Pittsburgh, Pennsylvania, USA
| | - Wenchen Zhao
- Clinical Pharmacokinetics Laboratory, University of Pittsburgh School of Pharmacy, Pittsburgh, Pennsylvania, USA
| | - Mariyam Javed
- Xenotransplantation Program, Department of Surgery, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Dalis E. Collins
- Animal Resources Program, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | | | - Eric Judd
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - David K. C. Cooper
- Xenotransplantation Program, Department of Surgery, University of Alabama at Birmingham, Birmingham, Alabama, USA
- Center for Transplantation Sciences, Department of Surgery, Massachusetts General Hospital/Harvard Medical School, Boston, MA, USA
| | - Raman Venkataramanan
- Clinical Pharmacokinetics Laboratory, University of Pittsburgh School of Pharmacy, Pittsburgh, Pennsylvania, USA
- Starzl Transplantation Institute, and Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| |
Collapse
|
3
|
Vasudevan V, Shen L, Huang C, Chuang C, Islam M, Ren H, Yang Y, Dong P, Xing L. Neural Representation for Three-Dimensional Dose Distribution and its Applications in Precision Radiation Therapy. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.2182] [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: 12/01/2022]
|
4
|
Abinash MJ, Vasudevan V. Boundaries tuned support vector machine (BT-SVM) classifier for cancer prediction from gene selection. Comput Methods Biomech Biomed Engin 2021; 25:794-807. [PMID: 34585639 DOI: 10.1080/10255842.2021.1981300] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
In recent days, the identified genes which are detecting cancer-causing diseases are plays a crucial part in the microarray data analysis. Huge volume of data required since the disease changed often. Conventional data mining techniques are lacking in space concern and time complexity. Based on big data the proposed work is executed. Using the ISPCA - Improved Supervised Principal Component Analysis, feature extraction is developed in this study. For gene expression, co-variance matrix is generated and through feature selection cancer classification is performed by IPSCA. Further feature selection process by boundaries tuned support vector machines (BT-SVM) classifier and modified particle swarm optimization with novel wrapper model algorithm are performed. The experimentation is carried out by utilizing different datasets like leukaemia, breast cancer dataset, brain cancer, colon, and lung carcinoma from the UCI repository. The proposed work is executed on six benchmark dataset for DNA microarray data in terms of accuracy, recall, and precision to evaluate the performance of the proposed work. For evaluating the proposed work effectiveness, it is compared with various traditional techniques and resulted in optimum accuracy, recall, precision and training time with and without feature selection effectively.
Collapse
Affiliation(s)
- M J Abinash
- Department of Computer Science, Sri Kaliswari College (Autonomous), Sivakasi, TamilNadu, India
| | - V Vasudevan
- Department of Information Technology, Kalasalingam Academy of Research and Education, Krishnankoil, Tamil Nadu, India
| |
Collapse
|
5
|
Vasudevan V, Huang C, Simiele E, Yu L, Xing L, Schuler E. Combining Monte Carlo with Deep Learning: Predicting High-resolution, Low-noise Dose Distributions Using a Generative Adversarial Network for Fast and Precise Monte Carlo Simulations. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.2157] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
6
|
Vinod DF, Vasudevan V. LNTP-MDBN: Big Data Integrated Learning Framework for Heterogeneous Image Set Classification. Curr Med Imaging 2020; 15:227-236. [PMID: 31975670 DOI: 10.2174/1573405613666170721103949] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 06/29/2017] [Accepted: 07/11/2017] [Indexed: 11/22/2022]
Abstract
BACKGROUND With the explosive growth of global data, the term Big Data describes the enormous size of dataset through the detailed analysis. The big data analytics revealed the hidden patterns and secret correlations among the values. The major challenges in Big data analysis are due to increase of volume, variety, and velocity. The capturing of images with multi-directional views initiates the image set classification which is an attractive research study in the volumetricbased medical image processing. METHODS This paper proposes the Local N-ary Ternary Patterns (LNTP) and Modified Deep Belief Network (MDBN) to alleviate the dimensionality and robustness issues. Initially, the proposed LNTP-MDBN utilizes the filtering technique to identify and remove the dependent and independent noise from the images. Then, the application of smoothening and the normalization techniques on the filtered image improves the intensity of the images. RESULTS The LNTP-based feature extraction categorizes the heterogeneous images into different categories and extracts the features from each category. Based on the extracted features, the modified DBN classifies the normal and abnormal categories in the image set finally. CONCLUSION The comparative analysis of proposed LNTP-MDBN with the existing pattern extraction and DBN learning models regarding classification accuracy and runtime confirms the effectiveness in mining applications.
Collapse
Affiliation(s)
- D Franklin Vinod
- Department of Information Technology, Kalasalingam University, Virudhunagar, Tamil Nadu 626126, India
| | - V Vasudevan
- Department of Information Technology, Kalasalingam University, Virudhunagar, Tamil Nadu 626126, India
| |
Collapse
|
7
|
Myles PS, Smith JA, Kasza J, Silbert B, Jayarajah M, Painter T, Cooper DJ, Marasco S, McNeil J, Bussières JS, McGuinness S, Byrne K, Chan MT, Landoni G, Wallace S, Forbes A, Myles P, Smith J, Cooper DJ, Silbert B, McNeil J, Marasco S, Esmore D, Krum H, Tonkin A, Buxton B, Heritier S, Merry A, Liew D, McNeil J, Forbes A, Cooper D, Wallace S, Meehan A, Myles P, Wallace S, Galagher W, Farrington C, Ditoro A, Wutzlhofer L, Story D, Peyton P, Baulch S, Sidiropoulos S, Potgieter D, Baker R, Pesudovs B, O'Loughlin J Wells E, Coutts P, Bolsin S, Osborne C, Ives K, Smith J, Hulley A, Christie-Taylor G, Painter T, Lang S, Mackay H, Cokis C, March S, Bannon P, Wong C, Turner L, Scott D, Silbert B, Said S, Corcoran P, Painter T, de Prinse L, Bussières J, Gagné N, Lamy A, Semelhago L, Chan M, Underwood M, Choi G, Fung B, Landoni G, Lembo R, Monaco F, Simeone F, Marianello D, Alvaro G, De Vuono G, van Dijk D, Dieleman J, Numan S, McGuinness S, Parke R, Raudkivi P, Gilder E, Byrne K, Dunning J, Termaat J, Mans G, Jayarajah M, Alderton J, Waugh D, Platt M, Pai A, Sevillano A, Lal A, Sinclair C, Kunst G, Knighton A, Cubas G, Saravanan P, Millner R, Vasudevan V, Patteril M, Lopez E, Basu R, Lu J. Tranexamic acid in coronary artery surgery: One-year results of the Aspirin and Tranexamic Acid for Coronary Artery Surgery (ATACAS) trial. J Thorac Cardiovasc Surg 2019; 157:644-652.e9. [DOI: 10.1016/j.jtcvs.2018.09.113] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 09/13/2018] [Accepted: 09/27/2018] [Indexed: 11/30/2022]
|
8
|
Vasudevan V, Amatya B, Chopra S, Zhang N, Astrakhantseva I, Khan F. Minimum technical standards and recommendations for traumatic brain injury specialist rehabilitation teams in sudden-onset disasters (for Disaster Rehabilitation Committee special session). Ann Phys Rehabil Med 2018. [DOI: 10.1016/j.rehab.2018.05.263] [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]
|
9
|
Shrihari TG, Vasudevan V, Manjunath V, Devaraju D. Potential Co-Relation Between Chronic Periodontitis And Cancer - An Emerging Concept. Gulf J Oncolog 2016; 1:20-24. [PMID: 27050175] [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] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/08/2015] [Indexed: 06/05/2023]
Abstract
Periodontal disease caused chiefly by bacteria is characterized by inflammation, bacteremia, and a strong immune response. It is based on evidence that a continuous long-term exposure to oral bacteremia and bacterial toxins induces inflammatory immune response after immune evasion releases growth factors such as FGF, EGF, TGF-Beta, free radicals such as ROS and NOS, cytokines such as TNFAlfa, IL-1 Beta, IL-6; and matrix metalloproteinase such as MMP-9. Immature myeloid cells such as macrophages, dendritic cells and granulocytes involved in chronic inflammation and tumor progression through immunosuppressive activity against innate and adaptive immunity by factors such as iNOS, Arginase1 and ROS, activate major transcriptional factors such as NF-KB and STAT3 that could contribute to genetic instability, uncontrolled cell proliferation, angiogenesis, resistance to apoptosis, epithelial to mesenchymal transition, immunosuppression, invasion and metastasis. This study is a product of research and analysis on the role of chronic inflammatory mediators of chronic periodontitis in progression to cancer.
Collapse
Affiliation(s)
- T G Shrihari
- Department of Oral Medicine and Radiology, Krishnadevaraya College of Dental Sciences, Bangalore, Karnataka, India
| | - V Vasudevan
- Department of Oral Medicine and Radiology, Krishnadevaraya College of Dental Sciences, Bangalore, Karnataka, India
| | - V Manjunath
- Department of Oral Medicine and Radiology, Krishnadevaraya College of Dental Sciences, Bangalore, Karnataka, India
| | - D Devaraju
- Department of Oral Medicine and Radiology, Krishnadevaraya College of Dental Sciences, Bangalore, Karnataka, India
| |
Collapse
|
10
|
Liu M, Mollica L, Regan J, Hawkins S, McGuiness H, Vetro K, Garczarek U, Shi S, Vasudevan V, Ananthapadmanabhan KP. Modified Corneosurfametry as a new accelerated high-throughput ex vivo methodology for predicting cleanser effects towards human skin. Int J Cosmet Sci 2015; 38:178-86. [PMID: 26352535 DOI: 10.1111/ics.12273] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2015] [Accepted: 08/23/2015] [Indexed: 11/28/2022]
Abstract
BACKGROUND Corneosurfametry (CSM) was originally developed as a tool to predict irritation potential of cleansers. In this method, surface skin stripped using cyanoacrylate is contacted with surfactants/products, rinsed and stained with toluidine blue and basic fuschin dyes. The intensity of staining increases with increases in irritation potential of surfactant. Our objective was to modify the CSM technique to achieve better control of the tape stripping process. Another objective was to correlate the modified CSM (MCSM) with a traditional in-vivo forearm controlled application test (FCAT) for mildness and to explore its utility to assess the state of corneum after a clinical test. METHODS Surface skin cells were tape stripped from forearms of volunteers with D-Squame Adhesive Discs. Discs were treated with a 10% solution of the product in a 96-plate well for 10 min, rinsed, dried and treated with basic fuschin-toluidine blue dye solution, rinsed and dried again. Forearm Controlled Application Test (FCAT) was based on a published protocol. Tape strips obtained after product treatment were also analyzed by the MCSM procedure without additional product treatment. RESULTS Mildness/barrier damage assessed from in-vivo FCAT showed a similar ranking to the MCSM results. MCSM, TEWL and Erythema analysis of between-treatment differences showed a good correlation indicating that barrier damage seen in in-vivo studies can be predicted from ex-vivo MCSM studies. MCSM analysis of tape strips after the FCAT study showed that the damage decreased with increase in tape strip number. A moisturizing body wash (MBW) with mild surfactants showed the least damage in all layers. In contrast, harsh dish washing liquid showed significantly higher damage down to several layers. Another MBW with petrolatum in a harsher base showed damage almost similar to that of the harsh dish washing liquid in the surface layers. Thus, the MCSM was able to show underlying damage which would have been normally masked by the deposited petrolatum. CONCLUSION The MCSM assay was shown to be a valuable tool for accelerated high throughput evaluation of mildness of surfactants and fully formulated products. MCSM can also be used to assess the state of the corneum after a product treatment.
Collapse
Affiliation(s)
- M Liu
- Unilever Research & Development, Trumbull, CT, U.S.A
| | - L Mollica
- Unilever Research & Development, Trumbull, CT, U.S.A
| | - J Regan
- Unilever Research & Development, Trumbull, CT, U.S.A
| | - S Hawkins
- Unilever Research & Development, Trumbull, CT, U.S.A
| | - H McGuiness
- Unilever Research & Development, Trumbull, CT, U.S.A
| | - K Vetro
- Unilever Research & Development, Trumbull, CT, U.S.A
| | - U Garczarek
- Unilever Research & Development, Trumbull, CT, U.S.A
| | - S Shi
- Unilever Research & Development, Trumbull, CT, U.S.A
| | - V Vasudevan
- Unilever Research & Development, Trumbull, CT, U.S.A
| | | |
Collapse
|
11
|
Vasudevan V, Renuka N, Ramesh Babu R, Ramamurthi K. Growth, spectral, thermal, optical, mechanical and etching studies of l-lysine semi-maleate (l-LSM) single crystals. Spectrochim Acta A Mol Biomol Spectrosc 2015; 136 Pt C:1850-1856. [PMID: 25467679 DOI: 10.1016/j.saa.2014.10.095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Revised: 10/13/2014] [Accepted: 10/23/2014] [Indexed: 06/04/2023]
Abstract
Organic nonlinear optical material, l-lysine semi-maleate (l-LSM) single crystals were grown by slow cooling solution growth technique. The crystal system of grown l-LSM was confirmed by single crystal and powder X-ray diffraction analyzes. Functional groups of the grown crystal have been identified by Fourier Transform Infrared spectral analysis. The proton and carbon NMR spectral studies confirm the presence of hydrogen and carbon in the grown l-LSM. The melting and thermal decomposition temperatures of the crystal were determined using thermogravimetric (TG) and differential scanning calorimetry (DSC) analyses. Optical transparency, second harmonic generation efficiency, micro hardness, dielectric constant and loss, refractive index and birefringence have also been measured. Further, the growth patterns and dislocations present in the grown crystal are studied.
Collapse
Affiliation(s)
- V Vasudevan
- Department of Physics, K.S. Rangasamy College of Technology, Tiruchengode 637 215, Tamil Nadu, India
| | - N Renuka
- School of Engineering & IT, Manipal University, Dubai, United Arab Emirates; Crystal Growth and Thin Film Laboratory, Department of Physics, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India
| | - R Ramesh Babu
- Crystal Growth and Thin Film Laboratory, Department of Physics, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India.
| | - K Ramamurthi
- Crystal Growth and Thin Film Laboratory, Department of Physics and Nanotechnology, SRM University, Kattankulathur Campus 603 203, Tamil Nadu, India
| |
Collapse
|
12
|
Vasudevan V, Ramesh Babu R, Ramamurthi K. Synthesis, growth and characterization of L-lysinium(+)...L-lysinium(2+) dichloride perchlorate (LLDP) single crystals by Sankaranarayanan-Ramasamy method. Spectrochim Acta A Mol Biomol Spectrosc 2012; 99:259-265. [PMID: 23085283 DOI: 10.1016/j.saa.2012.09.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Revised: 09/04/2012] [Accepted: 09/09/2012] [Indexed: 06/01/2023]
Abstract
L-lysinium(+)...L-lysinium(2+) dichloride perchlorate was synthesized at ambient temperature and bulk single crystals were grown by conventional and Sankaranarayanan-Ramasamy methods. Crystals grown by these methods were subjected to single crystal X-ray diffraction, Fourier transform infrared, high resolution X-ray diffraction, Vickers microhardness and thermogravimetric/differential scanning calorimetric/differential thermal analyses. Further, the cut-off wavelength and optical transmittance of the grown crystals were determined by UV-vis-NIR spectrum. Linear refractive index (n(x)) of the crystal was measured using minimum deviation method for different wavelengths. Optical quality of the grown crystals was analyzed by conoscopic interference pattern and the birefringence was calculated using interferometric technique. Surface laser damage threshold of the crystal was determined using Nd:YAG laser. The nonlinear refractive index n(2) was measured through the Z-scan technique using low power continuous wave HeNe laser. Frequency and temperature dependent dielectric constant (ε(r)) and dielectric loss (tanδ) were measured.
Collapse
Affiliation(s)
- V Vasudevan
- Crystal Growth and Thin Film Laboratory, Department of Physics, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India
| | | | | |
Collapse
|
13
|
Abstract
Rabson-Mendenhall syndrome is a rare, autosomal recessive disorder affecting insulin receptor. This disorder is characterized by insulin-resistant diabetes mellitus, hyperinsulinemia, deficiency of subcutaneous fat, acanthosis nigrican, growth retardation, coarse and senile appearance, precocious puberty, and dental prematurity, enlarged genitalia, and pineal hyperplasia. Mutations of the insulin receptor gene affecting insulin action appear to be the basic mechanism underlying this syndrome. Herein, we present a case report on Rabson-Mendenhall syndrome in a 9-year-old girl.
Collapse
Affiliation(s)
- J Gupta
- Department of Oral Medicine and Radiology, Mahatma Gandhi Postgraduate Institute of Dental Sciences, Gorimedu, Indira Nagar, Pondicherry, India.
| | | | | |
Collapse
|
14
|
|
15
|
|
16
|
Mary Anita EA, Vasudevan V. Prevention of Black Hole Attack in Multicast Routing Protocols for Mobile Ad-Hoc Networks Using a Self-Organized Public Key Infrastructure. Information Security Journal: A Global Perspective 2009. [DOI: 10.1080/19393550903324928] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
17
|
Singh JK, Vasudevan V, Bharadwaj N, Narasimhan KL. Role of tracheostomy in the management of foreign body airway obstruction in children. Singapore Med J 2009; 50:871-874. [PMID: 19787173] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
INTRODUCTION Foreign body aspiration in the airway of children is a life-threatening clinical situation. Endoscopic retrieval alone is successful in the majority of patients. Occasionally, open surgical intervention in the form of tracheostomy, thoracotomy and bronchotomy and/or pulmonary resection is needed. We analysed the specific indications for tracheostomy during the removal of airway foreign bodies in our study. METHODS The records of four patients who needed tracheostomy, out of 342 cases of foreign body airway obstruction managed by the senior author, were analysed. These patients underwent an additional tracheostomy for open removal of the foreign body and/or to secure the airway to facilitate the foreign body removal. RESULTS Rigid bronchoscopy was successful in retrieving the foreign bodies in 338 (98.8 percent) cases, while four (1.2 percent) cases required additional tracheostomy, either to protect the airway during the procedure or to assist in removing the foreign body. The indications for tracheostomy were subglottic foreign bodies of long duration, sharp subglottic foreign bodies and foreign bodies that were larger than the glottic chink. There was no mortality or long-term complication because of the tracheostomies. CONCLUSION Tracheostomy is occasionally indicated in foreign body extraction, when they are subglottic in location and impacted, or are large foreign bodies that get obstructed at the glottic chink during removal.
Collapse
Affiliation(s)
- J K Singh
- Department of Paediatric Surgery, Advanced Paediatric Center, Postgraduate Institute of Medical Education and Research, Sector 12, Chandigarh 160012, India
| | | | | | | |
Collapse
|
18
|
Singhal P, Hamilton MJ, Vasudevan V, Kejriwal R, Muthukumarswamy S, Kejriwal NK. Endovascular Aortic Arch Repair after Aortic Arch Debranching for Acute Dissection. Heart Lung Circ 2009. [DOI: 10.1016/j.hlc.2009.04.066] [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: 11/30/2022]
|
19
|
|
20
|
Abstract
Grids promote user collaboration through flexible, coordinated sharing of distributed resources to solve a single large problem. Grid scheduling, similar to resource discovery and monitoring, is inherently more complex in Grid environments. We propose two approaches for solving Grid scheduling problems with the simultaneous objectives of maximizing the number of workflow executions and minimizing the waiting time variance among tasks of each workflow. One is the multiple objective Niched Pareto Genetic Algorithm (NPGA) that involves evolution during a comprehensive search and work on multiple solutions. After the Genetic search, we strengthen the search using Simulated Annealing as a local search meta-heuristic. For comparison, we evaluate other scheduling, such as, Tabu Search (TS), Simulated annealing (SA), and Discrete Particle Swarm Optimization (Discrete PSO). Results show that our proposed evolutionary Hybrid scheduling involving NPGA with an SA search, works better than other scheduling in considering workflow execution time within a deadline and waiting time variance in tasks with minimal iterations.
Collapse
|
21
|
|
22
|
|
23
|
Saxena A, de Lagarde D, Leonard H, Williamson SL, Vasudevan V, Christodoulou J, Thompson E, MacLeod P, Ravine D. Lost in translation: translational interference from a recurrent mutation in exon 1 of MECP2. J Med Genet 2005; 43:470-7. [PMID: 16155192 PMCID: PMC2593027 DOI: 10.1136/jmg.2005.036244] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND Rett syndrome (RTT) is an X linked neuro-developmental disorder affecting mostly girls. Mutations in the coding region of MECP2 are found in 80% of classic RTT patients. Until recently, the region encoding MECP2 was believed to comprise exons 2, 3, and 4 with the ATG start site located at the end of exon 2 (MeCP2_e2). METHODS Recent reports of another mRNA transcript transcribed from exon 1 (MeCP2_e1) prompted us to screen exon 1 among RNA samples from 20 females with classic or atypical RTT. RESULTS A previously reported 11 base pair deletion in exon 1 was detected in one subject with a milder phenotype. Although RNA expression for both protein isoforms was detected from the mutant allele, evaluation of MeCP2 protein in uncultured patient lymphocytes by immunocytochemistry revealed that MeCP2 protein production was restricted to only 74-76% of lymphocytes. X chromosome inactivation studies of genomic DNA revealed similar XCI ratios at the HUMARA locus (73:27 with HpaII and 74:26 with McrBC). We have demonstrated that translation but not transcription of the MeCP2_e2 isoform is ablated by the 11 nucleotide deletion, 103 nucleotides upstream of the e2 translation start site. CONCLUSIONS These findings reveal that nucleotides within the deleted sequence in the 5'-UTR of the MeCP2_e2 transcript, while not required for transcription, are essential for translation.
Collapse
Affiliation(s)
- A Saxena
- Western Australian Institute for Medical Research, Centre for Medical Research, University of Western Australia, Level 2, North Block, Perth 6000, WA, Australia
| | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Vasudevan V, Ramakrishna M. Computation of the Average and Harmonic Noise Power-Spectral Density in Switched-Capacitor Circuits. ACTA ACUST UNITED AC 2004. [DOI: 10.1109/tcsi.2004.836844] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
25
|
Li C, Fleisher D, Li L, Schwier JR, Sweetana SA, Vasudevan V, Zornes LL, Pao L, Zhou SY, Stratford RE. Regional‐dependent intestinal absorption and meal composition effects on systemic availability of LY303366, a lipopeptide antifungal agent, in dogs. J Pharm Sci 2001. [DOI: 10.1002/1520-6017(200101)90:1<47::aid-jps6>3.3.co;2-u] [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: 11/10/2022]
|
26
|
Li C, Fleisher D, Li L, Schwier JR, Sweetana SA, Vasudevan V, Zornes LL, Pao LH, Zhou SY, Stratford RE. Regional-dependent intestinal absorption and meal composition effects on systemic availability of LY303366, a lipopeptide antifungal agent, in dogs. J Pharm Sci 2001; 90:47-57. [PMID: 11064378 DOI: 10.1002/1520-6017(200101)90:1<47::aid-jps6>3.0.co;2-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Low oral bioavailability and a negative meal effect on drug plasma levels motivated studies on formulation and meal composition effects on the absorption of LY303366, a poorly water-soluble, semisynthetic, cyclic peptide antifungal drug. Solid drug particle size and meal composition studies were evaluated in beagle dogs. Canine regional absorption studies were also carried out utilizing surgically implanted intestinal access ports, and Caco-2 studies were performed to evaluate drug candidate intestinal permeability. Particle size and Caco-2 data indicate that drug permeability limitations to absorption are more important than dissolution rate limits. Caco-2 cell-associated LY303366 approached 10% of incubation concentration that is in the range of the oral bioavailability of the drug. Canine regional absorption studies showed that the extent of LY303366 absorption following duodenal administration was similar to that following oral administration. Significantly lower drug plasma levels were obtained following administration through a colonic access port, a result consistent with poor membrane permeation. Administration of drug with meals of mixed composition, as well as simple fat and protein meals, resulted in significant reductions in AUC(0-48h) compared with results from fasted dogs. In contrast, carbohydrate meals did not reduce drug plasma levels compared to controls. Intravenous pretreatment with devazepide, a cholecystokinin (CCK) antagonist that blocks canine biliary secretion, did not reverse the negative effect of the fat meal on LY303366. Taken together, the results from the present study suggest that membrane-permeability-limited absorption is the cause of the observed regionally dependent absorption of LY303366 in the dog and that the observed negative meal effects depend on composition but are independent of biliary secretion.
Collapse
Affiliation(s)
- C Li
- 3058 College of Pharmacy, University of Michigan, Ann Arbor, Michigan 48109-1065, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
27
|
|
28
|
Wiley MR, Weir LC, Briggs SL, Chirgadze NY, Clawson D, Gifford-Moore DS, Schacht AL, Smith GF, Vasudevan V, Zornes LL, Klimkowski VJ. The design of potent, selective, non-covalent, peptide thrombin inhibitors utilizing imidazole as a S1 binding element. Bioorg Med Chem Lett 1999; 9:2767-72. [PMID: 10509932 DOI: 10.1016/s0960-894x(99)00459-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Modeling of neutral or mildly basic functional groups in the S1 site of thrombin led to the targeting of imidazole as a S1 binding element and correctly predicted the optimal chain length for connecting this group with the S2 and S3 binding elements. Derivatives of 4-(3-aminopropyl)-imidazole can be selective inhibitors of thrombin demonstrating potent anticoagulant activity.
Collapse
Affiliation(s)
- M R Wiley
- Lilly Research Laboratories, A Division of Eli Lilly and Company, Lilly Corporate Center, Indianapolis, IN 46285, USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Stratford RE, Clay MP, Heinz BA, Kuhfeld MT, Osborne SJ, Phillips DL, Sweetana SA, Tebbe MJ, Vasudevan V, Zornes LL, Lindstrom TD. Application of oral bioavailability surrogates in the design of orally active inhibitors of rhinovirus replication. J Pharm Sci 1999; 88:747-53. [PMID: 10430536 DOI: 10.1021/js990036t] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Previous studies in rats and humans demonstrated poor oral bioavailability of potent in vitro 2-aminobenzimidazole inhibitors of rhinovirus replication due to significant first-pass elimination and possibly also to poor aqueous solubility. Estimations of aqueous solubility, as well as measurements of caco-2 permeability and NADPH dependent compound loss in rat liver microsomal incubations were employed alongside traditional in vivo experiments in rats to guide subsequent chemistry efforts. Retention of activity upon replacement of the metabolically labile vinyl oxime in the lead molecule with a vinyl carboxamide was a major breakthrough; however, oral bioavailability among the latter compounds was variable. Based on the ability to independently measure solubility, permeability, and metabolic stability of new compounds, variable solubility across the series (ranging from approximately 1 to 10 microg/mL) was identified as the cause of the inconsistent performance. Subsequent efforts to improve solubility led to the discovery of highly soluble (>10 mg/mL) and potent dessulfonyl vinyl carboxamide benzimidazoles. Determination of the metabolic stability of these compounds as a surrogate of the extent of their first-pass elimination supported a prediction of excellent oral bioavailability. In comparison to the sulfonyl-containing vinyl carboxamides, caco-2 permeabilities were reduced 5 to 10-fold; however, these were considered to be in the range of well-absorbed compounds based on comparison to a series of reference compounds of known percentage absorption in humans. Subsequent experiments in the rat verified the oral bioavailability of these N-alkyl compounds, with one compound (368177) having an absolute oral bioavailability of 89.4%. The application of solubility and caco-2 permeability as surrogates for oral absorption potential, in conjunction with the use of microsomal incubations as a surrogate for first-pass metabolism, was shown to augment a rational chemistry approach to discover orally bioavailable inhibitors of rhinovirus replication. Future expanded use of these surrogates is planned.
Collapse
Affiliation(s)
- R E Stratford
- Lilly Research Laboratories, Division of Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana 46285, USA.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Abstract
A facile synthesis of phosphonate and phosphate ester prodrugs on the phenolic hydroxy of two echinocandin semisynthetic derivatives is reported. The water solubility and stability profiles of the ECB compounds varied with the choice of alkyl group used. In some cases, the ester prodrugs with small aliphatic side chains retained antifungal activity while enhancing water solubility.
Collapse
Affiliation(s)
- M J Rodriguez
- Eli Lilly and Company, Lilly Research Laboratories, Indianapolis, IN 46285, USA
| | | | | | | | | |
Collapse
|
31
|
Tan B, Vasudevan V, Lee YJ, Gardner S, Davis RM, Bullions T, Loos AC, Parvatareddy H, Dillard DA, McGrath JE, Cella J. Design and characterization of thermosetting polyimide structural adhesive and composite matrix systems. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/(sici)1099-0518(199710)35:14<2943::aid-pola15>3.0.co;2-j] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
32
|
Miro AM, Vasudevan V, Shah H. Ciliary motility in two patients with yellow nail syndrome and recurrent sinopulmonary infections. Am Rev Respir Dis 1990; 142:890-1. [PMID: 2221597 DOI: 10.1164/ajrccm/142.4.890] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The yellow nail syndrome (YNS) is described as a combination of yellow nails, chronic lymphedema, pleural effusions, and recurrent sinopulmonary infections, but all these features need not be present for the diagnosis. The mechanism that renders patients with this syndrome susceptible to respiratory infections is not known. To determine whether abnormal ciliary motility is a predisposing factor, in vitro ciliary beat frequency (CBF) was measured in two patients with YNS and recurrent respiratory infections. In each case, the CBF was within normal limits (12 Hz). These data suggest that abnormal ciliary motility is not a pathophysiologic mechanism of recurrent sinopulmonary infections in YNS.
Collapse
Affiliation(s)
- A M Miro
- Department of Internal Medicine, Woodhull Medical and Mental Health Center, State University of New York Health Science Center, Brooklyn
| | | | | |
Collapse
|