1
|
Chitra N, Chandrasekaran S, Venkata Srinivas C, Athmalingam S, Venkatraman B. Track detector based discriminative thoron measurement – An optimization study through experiments and modelling. Radiat Phys Chem Oxf Engl 1993 2023. [DOI: 10.1016/j.radphyschem.2022.110755] [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: 12/31/2022]
|
2
|
Manikanda Bharath K, Natesan U, Chandrasekaran S, Srinivasalu S, Abdelrahman K, Abu-Alam T, Abioui M. Geochemometrics of primordial radionuclides and their potential radiological risk in coastal sediments of Southeast Coast of India. Journal of Radiation Research and Applied Sciences 2023. [DOI: 10.1016/j.jrras.2023.100525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
3
|
Talebnia F, Pushparajah D, Chandrasekaran S, Hersch SJ, Nafissi N, Slavcev R. Application of an electro elution system for direct purification of linear covalently closed DNA fragments. J Chromatogr B Analyt Technol Biomed Life Sci 2023; 1218:123622. [PMID: 36842293 DOI: 10.1016/j.jchromb.2023.123622] [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: 11/14/2022] [Revised: 01/23/2023] [Accepted: 01/25/2023] [Indexed: 02/10/2023]
Abstract
Gene therapy is a powerful treatment modality. Non-viral gene therapy vectors power one arm of this important approach, due to their enhanced safety profile compared to their viral counterparts. New non-viral approaches continue to be developed, but purification can bottleneck the scaleup and cost-effectiveness and quality of some of these advanced vectors. We require more advanced purification and separation techniques compared to conventional methods to maximize resolution in a scalable manner. The Prep Cell system is a continuous electro elution system that contains a circular gel casting tube where DNA mixtures can be run through and subsequently migrate into an elution chamber, to be eluted by a peristaltic pump. This DNA separation and purification process confers advantages over other conventional methods, including i) the elimination of multiple downstream purification process requirements; ii) its ability to be applied in mid-scale settings, and iii), its high-resolution power. In this study, we assessed the ability of this Prep Cell Model 491 system to purify a novel type of non-viral linear covalently closed (LCC) DNA minivector (ministring DNA) from its precursor parent plasmid DNA and process by-product DNA species by analyzing for effective separation via agarose gel electrophoresis, recovery yield, single enzyme digestion, and quality control assessments. Overall, effective separation and resolution of mini-DNA vectors was obtained using the Prep Cell system, conferring its potential to be applied towards mid-scale purification of DNA vectors for a variety of research, and eventually, clinical applications.
Collapse
Affiliation(s)
- F Talebnia
- Mediphage Bioceuticals, Inc. 661 University Avenue, Suite 1300, MaRS West Tower, Toronto, ON M5G0B7, Canada
| | - D Pushparajah
- University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
| | - S Chandrasekaran
- Mediphage Bioceuticals, Inc. 661 University Avenue, Suite 1300, MaRS West Tower, Toronto, ON M5G0B7, Canada
| | - S J Hersch
- Mediphage Bioceuticals, Inc. 661 University Avenue, Suite 1300, MaRS West Tower, Toronto, ON M5G0B7, Canada
| | - N Nafissi
- Mediphage Bioceuticals, Inc. 661 University Avenue, Suite 1300, MaRS West Tower, Toronto, ON M5G0B7, Canada.
| | - R Slavcev
- Mediphage Bioceuticals, Inc. 661 University Avenue, Suite 1300, MaRS West Tower, Toronto, ON M5G0B7, Canada; University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada.
| |
Collapse
|
4
|
D. L, Nagpal N, Chandrasekaran S, D. JH. A quantum-based approach for offensive security against cyber attacks in electrical infrastructure. Appl Soft Comput 2023. [DOI: 10.1016/j.asoc.2023.110071] [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: 02/05/2023]
|
5
|
Karmakar S, Srinivas CV, Rakesh PT, Gopalakrishnan V, Chandrasekaran S, Athmalingam S, Venkatraman B. Development of a numerical model for sector-average plume gamma dose and its validation with dose rate measurements at Kalpakkam NPP site, India. J Environ Radioact 2022; 255:107029. [PMID: 36265399 DOI: 10.1016/j.jenvrad.2022.107029] [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] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 09/15/2022] [Accepted: 09/19/2022] [Indexed: 06/16/2023]
Abstract
A Gaussian Plume based simple numerical model, named DIFFUSE is developed to simulate the long-term sector-average plume gamma dose due to radioactive plume released during normal operation of nuclear facilities. DIFFUSE calculates site specific joint frequency distributions of wind speed, wind direction and atmospheric stability using micrometeorological observations. It performs the finite sector-average dose integration for any stack height and gamma energy using Simpson's 1/3rd method with sufficient computational efficiency within the site boundary up to 2 km. Plume dose contribution to the main plume sector from nearest and next nearest side plume sectors is also calculated. DIFFUSE is validated with a 3-month long, starting from February 2021 to April 2021, dose rate observation data during operational releases from 100 m stack of Madras Atomic Power Station, Kalpakkam, India. Meteorological data from onsite 50 m tower and continuous dose rate observation from two sets of Autonomous Gamma Dose Logger (AGDL) detectors, namely n-AGDLs and r-AGDLs, placed in two different configurations along the geometric arcs of wind sectors around the stack are used. Simulated doses are compared with look-up table based dose estimates by Hukkoo et al. (1988). Linear spatial averaging of cumulative AGDL doses on a sector arc is used as measured sector-average dose for model validation. Simulations performed for both n-AGDL and r-AGDL configurations show DIFFUSE estimated doses are ∼37% lower and Hukkoo estimated doses are at least ∼50% lower than the measured doses. Statistical analysis of DIFFUSE simulated doses shows a statistical correlation of R2∼98.3%, slope of the fit ∼1.36 for n-AGDL setup and R2∼75.3%, slope of the fit ∼1.57 for r-AGDL setup. Overall, DIFFUSE produces conservative doses compared to look-up table based doses as required by regulatory bodies.
Collapse
Affiliation(s)
- Shanu Karmakar
- Environmental Assessment Division, Safety Quality & Resource Management Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India.
| | - C V Srinivas
- Environmental Assessment Division, Safety Quality & Resource Management Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
| | - P T Rakesh
- Environmental Assessment Division, Safety Quality & Resource Management Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
| | - V Gopalakrishnan
- Environmental Assessment Division, Safety Quality & Resource Management Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
| | - S Chandrasekaran
- Environmental Assessment Division, Safety Quality & Resource Management Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
| | - S Athmalingam
- Environmental Assessment Division, Safety Quality & Resource Management Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
| | - B Venkatraman
- Environmental Assessment Division, Safety Quality & Resource Management Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
| |
Collapse
|
6
|
Meenakshi C, Venkatachalam P, Satish Srinivas K, Chandrasekaran S, Venkatraman B. Chromosome length ratio as a biomarker of DNA damage in cells exposed to high dose ionizing radiation. Mutat Res Genet Toxicol Environ Mutagen 2022; 879-880:503501. [PMID: 35914861 DOI: 10.1016/j.mrgentox.2022.503501] [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] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 04/28/2022] [Accepted: 05/13/2022] [Indexed: 06/15/2023]
Abstract
The premature chromosome condensation (PCC) assay is considered as complementary bio-dosimetry tool for chromosome aberration assay and the PCC assay can be used to estimate high dose exposure. Though the PCC ring is considered as prospective biomarker, chromosome length ratio (ratio of longest and shortest chromosome length in PCC spreads) of chemically induced PCC is shown to be very good indicator of ionizing radiation. In view of this, an in-vitro study has been performed using PCC assay to suggest chromosome length ratio (LR) as potential bio-dosimeter induced by high dose ionizing radiation. Blood samples were collected from healthy subjects (n = 3) after prior consent and irradiated to ten different doses ranging between 0 and 20 Gy using 6 MV LINAC X-rays with dose rate of 5.6 Gy/min. Irradiated lymphocytes were cultured and calyculin induced PCC spreads were prepared. PCC spreads were captured using image analysis system and chromosome lengths were measured using open-source ImageJ software. For each dose, LR for 50 chromosome spreads were computed and mean LR value was calculated. LR varies between 6.0 ± 0.08 and 23.6 ± 0.55 for the dose range between 2 and 20 Gy. The dose response curve for LR was observed to be linear with y = 1.02x + 3.36, R2 = 0.97. Linear dose response relationship obtained in the present study confirms the prospective use of LR measurement. This study is first of its kind to examine chromosome length ratio as a biomarker of DNA damage in cells exposed to high dose X-ray exposure.
Collapse
Affiliation(s)
- C Meenakshi
- Human Genetics Department, Sri Ramachandra Institute of Higher Education and Research, Chennai 600116, India.
| | - P Venkatachalam
- Human Genetics Department, Sri Ramachandra Institute of Higher Education and Research, Chennai 600116, India
| | - K Satish Srinivas
- Department of Radiation Oncology, Sri Ramachandra Institute of Higher Education and Research, Chennai 600116, India
| | - S Chandrasekaran
- Health, Safety and Environmental Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - B Venkatraman
- Health, Safety and Environmental Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| |
Collapse
|
7
|
Kundu D, Srinivas C, Chandrasekaran S, Venkatraman B. Radiological consequence assessment for hypothetical nuclear explosion scenario using HotSpot. Progress in Nuclear Energy 2022. [DOI: 10.1016/j.pnucene.2022.104192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
8
|
Chitra N, Chandrasekaran S, Srinivas CV, Athmalingam S, Venkatraman B. Determination of soil porosity by a simple and novel technique of fusing thoron diffusion experiment and modeling. J Radioanal Nucl Chem 2022. [DOI: 10.1007/s10967-022-08312-2] [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: 11/29/2022]
|
9
|
Jacob D, Vigasini N, Chandrasekaran S, Perumal A. Assessment of In Vitro Antioxidant, Antipsoriatic and Anticancer Activity of Methanolic Extract of Nigella sativa Seeds. Indian J Pharm Sci 2022. [DOI: 10.36468/pharmaceutical-sciences.983] [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: 11/22/2022] Open
|
10
|
Panigrahi S, Mohanty AK, Samantara MK, Sahu G, Chandrasekaran S, Subramanian V, Srinivas CV. Distribution, annual committed effective dose, and health safety assessment of 210Po in marine biota from Kalpakkam coast, Bay of Bengal. Mar Pollut Bull 2021; 173:113147. [PMID: 34808544 DOI: 10.1016/j.marpolbul.2021.113147] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 11/10/2021] [Accepted: 11/11/2021] [Indexed: 06/13/2023]
Abstract
Seafood, intertidal biota, beach sediment, and seawater from Kalpakkam coast, Bay of Bengal were analyzed for 210Po to evaluate the internal exposure and other radiological safety aspects. Kalpakkam houses various nuclear power generation facilities on its coast. The activity concentration of 210Po was more pronounced in the intertidal organisms. Pelagic planktivorous fishes have the highest activity of the non-technogenic radionuclide, followed by the detrital feeders, benthic planktivores, benthic carnivores, and pelagic carnivore fishes. The affinity of 210Po to organic detrital matter and planktonic organisms has led to a higher accumulation of radionuclide in planktivorous fishes. Activity concentration of 210Po in seafood ranged between 1.13 ± 0.3 and 96.71 ± 1.6 Bq kg-1 (Becquerel/kilogram). In seaweeds and gastropods, it ranged from 2.09 ± 0.2 to 8.21 ± 0.6 and from 9.31 ± 0.7 to 21.58 ± 1.2 Bq kg-1, respectively. The committed effective dose (CED) of 210Po in seafood varied from 31.18 to 456.68 μSv yr-1 (microSievert/year). Radiological hazard parameters, such as activity intake, CED in consumption, of the seafood from this coast are within the acceptable levels prescribed by the International Commission on Radiological Protection and US Environmental Protection Agency.
Collapse
Affiliation(s)
- Satyanarayan Panigrahi
- Environmental Assessment Section, EAD/RESG/SQRMG, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India.
| | - A K Mohanty
- Aerosol Transport and Biodiversity Section, RESD/RESG/SQRMG, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - M K Samantara
- Aerosol Transport and Biodiversity Section, RESD/RESG/SQRMG, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - G Sahu
- Aerosol Transport and Biodiversity Section, RESD/RESG/SQRMG, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - S Chandrasekaran
- Environmental Assessment Section, EAD/RESG/SQRMG, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India; Homi Bhaba National Institute, Anushakti Nagar, Mumbai, India
| | - V Subramanian
- Aerosol Transport and Biodiversity Section, RESD/RESG/SQRMG, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - C V Srinivas
- Environmental Assessment Section, EAD/RESG/SQRMG, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India; Homi Bhaba National Institute, Anushakti Nagar, Mumbai, India
| |
Collapse
|
11
|
Chandrasekaran S, Danis D, Jayanthi S, Vasanthi R. Vibrio parahaemolyticus in sea food in north Chennai coastal retail shops. Indian J Med Microbiol 2021. [DOI: 10.1016/j.ijmmb.2021.08.105] [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]
|
12
|
Meenakshi C, Venkatachalam P, Chandrasekaran S, Venkatraman B. Construction of dose response curve for 6 MV LINAC X-rays using Premature Chromosome Condensation assay for radiation dosimetry. Appl Radiat Isot 2021; 173:109729. [PMID: 33906115 DOI: 10.1016/j.apradiso.2021.109729] [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: 08/25/2020] [Revised: 03/28/2021] [Accepted: 04/09/2021] [Indexed: 10/21/2022]
Abstract
Quantification of chromosomal aberrations in the exposed personnel blood samples is considered as a 'gold standard' and sensitive biomarker in biological dosimetry. Despite technological developments, culture of cells for 48-52 h remains an unmet need in case of triage biodosimetry. Moreover, it is difficult to get sufficient number of metaphase spreads for scoring after high doses of exposures. The technique which causes condensation of chromatin before mitosis using biological or chemical agent is named as Premature Chromosome Condensation (PCC) assay. This assay is considered as an alternative to chromosome aberration assay, particularly at high acute doses of low and high LET radiation. To establish the PCC assay, blood samples were collected from healthy non-smoking individuals (n = 3) and exposed to various doses (0-20 Gy) of 6 MV X-rays at a dose rate of 5.6 Gy/min, using a high energy Linear accelerator (LINAC). Irradiated blood samples were subjected to Calyculin-A induced PCC. About 500 cells or more than 100 Ring Chromosomes (RC) were scored at each dose. Dicentric chromosomes (DC) and acentric fragments were also scored at each dose; the number of chromosomal aberrations in G1, M, G2/M and M/A phase of cell cycle were recorded and the frequency was used to construct the dose response curve. A dose dependent increase in RC and DC frequency were observed with a slope of 0.049 ± 0.002 and 0.30 ± 0.02 respectively. This study is first of its kind to construct a dose response curve for LINAC X-rays using a PCC assay.
Collapse
Affiliation(s)
- C Meenakshi
- Human Genetics Department, Sri Ramachandra Institute of Higher Education and Research, Chennai, Tamilnadu, India
| | - P Venkatachalam
- Human Genetics Department, Sri Ramachandra Institute of Higher Education and Research, Chennai, Tamilnadu, India.
| | - S Chandrasekaran
- Health, Safety and Environmental Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu, India
| | - B Venkatraman
- Health, Safety and Environmental Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu, India
| |
Collapse
|
13
|
Balasundar S, Chandrasekaran S, Subramanian V, Venkatraman B. Investigations on neutron attenuation properties of poly-boron materials using Am-Be and 252Cf sources neutron spectra. ANN NUCL ENERGY 2021. [DOI: 10.1016/j.anucene.2020.108083] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
14
|
Radhakrishnan D, Boopathy M, Gopalakrishnan V, Rakesh PT, Chandrasekaran S, Srinivas CV, Venkatesan R, Venkatraman B. Long-term trends in gamma radiation monitoring at the multi-facility nuclear site, Kalpakkam, South-India. Radiat Prot Environ 2021. [DOI: 10.4103/rpe.rpe_18_21] [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: 11/04/2022] Open
|
15
|
Kalra S, Das AK, Priya G, Ghosh S, Mehrotra RN, Das S, Shah P, Bajaj S, Deshmukh V, Sanyal D, Chandrasekaran S, Khandelwal D, Joshi A, Nair T, Eliana F, Permana H, Fariduddin MD, Shrestha PK, Shrestha D, Kahandawa S, Sumanathilaka M, Shaheed A, Rahim AA, Orabi A, Al-Ani A, Hussein W, Kumar D, Shaikh K. Fixed-dose combination in management of type 2 diabetes mellitus: Expert opinion from an international panel. J Family Med Prim Care 2020; 9:5450-5457. [PMID: 33532378 PMCID: PMC7842427 DOI: 10.4103/jfmpc.jfmpc_843_20] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/14/2020] [Accepted: 08/03/2020] [Indexed: 01/08/2023] Open
Abstract
Type 2 diabetes mellitus (T2DM) is a progressive disease with multifactorial etiology. The first-line therapy includes monotherapy (with metformin), which often fails to provide effective glycemic control, necessitating the addition of add-on therapy. In this regard, multiple single-dose agents formulated as a single-dose form called fixed-dose combinations (FDCs) have been evaluated for their safety, efficacy, and tolerability. The primary objective of this review is to develop practice-based expert group opinion on the current status and the causes of concern regarding the irrational use of FDCs, in Indian settings. After due discussions, the expert group analyzed the results from several clinical evidence in which various fixed combinations were used in T2DM management. The panel opined that FDCs (double or triple) improve patient adherence, reduce cost, and provide effective glycemic control and, thereby, play an important role in the management of T2DM. The expert group strongly recommended that the irrational metformin FDC's, banned by Indian government, should be stopped and could be achieved through active participation from the government, regulatory bodies, and health ministry, and through continuous education of primary care physicians and pharmacists. In T2DM management, FDCs play a crucial role in achieving glycemic targets effectively. However, understanding the difference between rational and irrational FDC combinations is necessary from the safety, efficacy, and tolerability perspective. In this regard, primary care physicians will have to use a multistep approach so that they can take informed decisions.
Collapse
Affiliation(s)
- Sanjay Kalra
- Department of Endocrinology, Bharti Hospital and BRIDE, Karnal, Haryana, India
| | - A K Das
- Department of Endocrinology and Medicine, Pondicherry Institute of Medical Sciences, Puducherry, India
| | - G Priya
- Department of Endocrinology, Fortis Hospital, Mohali, India
| | - S Ghosh
- Department of Endocrinology and Metabolism, IPGMER, Kolkata, West Bengal, India
| | - R N Mehrotra
- Department of Endocrinology, Apollo Hospitals, Jubilee Hills, Hyderabad, Telangana, India
| | - S Das
- Department of Endocrinology, Apollo Hospitals, Bhubaneswar, Odisha, India
| | - P Shah
- Department of Endocrinology and Diabetes Gujarat Endocrine Centre, Ahmedabad, Gujarat, India
| | - S Bajaj
- Department of Endocrinology, MLN Medical College, Allahabad, Uttar Pradesh, India
| | - V Deshmukh
- Department of Endocrinology, Deshmukh Clinic and Research Centre, Pune, Maharashtra, India
| | - D Sanyal
- Department of Endocrinology, KPC Medical College, Kolkata, West Bengal, India
| | - S Chandrasekaran
- Department of Endocrinology and Diabetes, Dr. Rela Institute of Medical Science (RIMC), Chennai, Tamil Nadu, India
| | - D Khandelwal
- Department of Endocrinology and Diabetes, Maharaja Agrasen Hospital, New Delhi, India
| | - A Joshi
- Department of Endocrinology, Kathmandu Diabetes and Thyroid Centre, Nepal
| | - T Nair
- Department of Cardiology, PRS Hospital, Trivandrum, Kerala, India
| | - F Eliana
- Department of Internal Medicine, Faculty of Medicine, YARSI University, Jakarta, Indonesia
| | - H Permana
- Department of Internal Medicine, Faculty of Medicine, Padjadjaran University, Bandung, Indonesia
| | - M D Fariduddin
- Department of Endocrinology of Bangabandhu Sheikh, Mujib Medical University, Dhaka, Bangladesh
| | - P K Shrestha
- Department of Internal Medicine, Tribhuwan University Teaching Hospital, Kathmandu, Nepal
| | - D Shrestha
- Department of Endocrinologist, Norvic International Hospital, Kathmandu, Nepal
| | - S Kahandawa
- Department of Endocrinology, Teaching Hospital Karapitiya, Galle, Sri Lanka
| | - M Sumanathilaka
- Department of Endocrinology, National Hospital of Sri Lanka, Colombo, Sri Lanka
| | - A Shaheed
- Department of Internal Medicine, Indira Gandhi Memorial Hospital, Malé, Maldives
| | - A A Rahim
- Department of Diabetes and Metabolism, Alexandria University, Alexandria, Egypt
| | - A Orabi
- Department of Internal Medicine, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - A Al-Ani
- Department of Internal Medicine, Hamad Hospital, Doha, Qatar
| | - W Hussein
- Department of Endocrinology and Diabetes, Dr. Wiam Clinic, Royal Hospital, Awali Hospital, Bahrain
| | - D Kumar
- Department of Endocrinology, NMC Specialty Hospital, Abu Dhabi, UAE
| | - K Shaikh
- Department of Diabetes, Faculty of Internal Medicine, Royal Oman Police Hospital, Muscat, Oman
| |
Collapse
|
16
|
Ruggiero S, Chandrasekaran S, Key K, Ranker L, Gerdts C. P18 Improving the travel experiences of later abortion clients: Recommendations from clinics and abortion support organizations. Contraception 2020. [DOI: 10.1016/j.contraception.2020.07.037] [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: 11/25/2022]
|
17
|
Kalra S, Ghosh S, Das AK, Nair T, Bajaj S, Priya G, Mehrotra RN, Das S, Shah P, Deshmukh V, Chawla M, Sanyal D, Chandrasekaran S, Khandelwal D, Joshi A, Eliana F, Permana H, Fariduddin MD, Shrestha PK, Shrestha D, Kahandawa S, Sumanathilaka M, Shaheed A, Rahim AA, Orabi A, Al-Ani A, Hussein W, Kumar D, Shaikh K. Unravelling the utility of modern sulfonylureas from cardiovascular outcome trials and landmark trials: expert opinion from an international panel. Indian Heart J 2020; 72:7-13. [PMID: 32423565 PMCID: PMC7231843 DOI: 10.1016/j.ihj.2020.01.001] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 12/25/2019] [Accepted: 01/05/2020] [Indexed: 12/13/2022] Open
Abstract
AIM The primary objective of this review is to develop practice-based expert group opinions on the cardiovascular (CV) safety and utility of modern sulfonylureas (SUs) in cardiovascular outcome trials (CVOTs). BACKGROUND The United States Food and Drug Administration issued new guidance to the pharmaceutical industry in 2008 regarding the development of new antihyperglycemic drugs. The guidance expanded the scope for the approval of novel antihyperglycemic drugs by mandating CVOTs for safety. A few long-term CVOTs on dipeptidyl peptidase 4 inhibitors, glucagon-like peptide 1 receptor agonists, and sodium-glucose cotransporter 2 inhibitors have been completed, while others are ongoing. SUs, which constitute one of the key antihyperglycemic agents used for the management of type 2 diabetes mellitus (T2DM), have been used as comparator agents in several CVOTs. However, the need for CVOTs on modern SUs remains debatable. In this context, a multinational group of endocrinologists convened for a meeting and discussed the need for CVOTs of modern SUs to evaluate their utility in the management of patients with T2DM. At the meeting, CVOTs of modern SUs conducted to date and the hypotheses derived from the results of these trials were discussed. REVIEW RESULTS The expert group analyzed the key trials emphasizing the CV safety of modern SUs and also reviewed the results of various CVOTs in which modern SUs were used as comparators. Based on literature evidence and individual clinical insights, the expert group opined that modern SUs are cardiosafe and that since they have been used as comparators in other CVOTs, CVOTs of SUs are not required. CONCLUSION Modern SUs can be considered a cardiosafe option for the management of patients with diabetes mellitus and CV disease; thus CVOTs among individuals with T2DM are not required.
Collapse
Affiliation(s)
- S Kalra
- Department of Endocrinology, Bharti Hospital and BRIDE, Karnal, Haryana, India.
| | - S Ghosh
- Department of Endocrinology and Metabolism, IPGMER, Kolkata, West Bengal, India
| | - A K Das
- Department of Endocrinology & Medicine, Pondicherry Institute of Medical Sciences, Puducherry, India
| | - T Nair
- Dept. of Cardiology, PRS Hospital, Trivandrum, Kerala, India
| | - S Bajaj
- Department of Endocrinology, MLN Medical College, Allahabad, Uttar Pradesh, India
| | - G Priya
- Department of Endocrinology, Fortis Hospital, Chandigarh, Punjab, India
| | - R N Mehrotra
- Department of Endocrinology, Apollo Hospitals, Jubilee Hills, Hyderabad, India
| | - S Das
- Department of Endocrinology, Apollo Hospitals in Bhubaneswar, India
| | - P Shah
- Department of Endocrinology and Diabetes Gujarat Endocrine Centre, Ahmedabad, India
| | - V Deshmukh
- Department of Endocrinology, Deshmukh Clinic and Research Centre, Pune, Maharashtra
| | - M Chawla
- Department of Diabetology, Lina Diabetes Care and Mumbai Diabetes Research Centre, Mumbai, India
| | - D Sanyal
- Department of Endocrinology, KPC Medical College, Kolkata, West Bengal
| | - S Chandrasekaran
- Department of Endocrinology & Diabetes, Dr. Rela Institute of Medical Science (RIMC), Chennai, Tamil Nadu, India
| | - D Khandelwal
- Department of Endocrinology & Diabetes, Maharaja Agrasen Hospital, New Delhi, India
| | - A Joshi
- Department of Endocrinology & Diabetes, Bhaktivedanta Hospital and Research Institute, Mumbai, India
| | - F Eliana
- Department of Internal Medicine, Faculty of Medicine, YARSI University, Jakarta, Indonesia
| | - H Permana
- Department of Internal Medicine, Faculty of Medicine, Padjadjaran University, Bandung, Indonesia
| | - M D Fariduddin
- Department of Endocrinology of Bangabandhu Sheikh, Mujib Medical University, Dhaka, Bangladesh
| | - P K Shrestha
- Department of Internal Medicine, Tribhuwan University Teaching Hospital, Kathmandu, Nepal
| | - D Shrestha
- Department of Endocrinologist, Norvic International Hospital Kathmandu, Nepal
| | - S Kahandawa
- Department of Endocrinology, Teaching Hospital Karapitiya, Sri Lanka
| | - M Sumanathilaka
- Department of Endocrinology, National Hospital of Sri Lanka, Colombo, Sri Lanka
| | - A Shaheed
- Department of Internal Medicine, Indira Gandhi Memorial Hospital, Malé, Maldives
| | - A A Rahim
- Department of Diabetes and Metabolism, Alexandria University, Alexandria, Egypt
| | - A Orabi
- Department of Internal Medicine, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - A Al-Ani
- Department of Internal Medicine, Hamad General Hospital, Doha, Qatar
| | - W Hussein
- Department of Endocrinology & Diabetes, Royal Hospital, Bahrain
| | - D Kumar
- Department of Endocrinology, NMC Specialty Hospital, Abu Dhabi
| | - K Shaikh
- Department of Diabetes, Faculty of Internal Medicine, Royal Oman Police Hospital, Muscat, Oman
| |
Collapse
|
18
|
Chandrasekaran S, Gerdts C, Robinson Y, Hannum C, Blanchard K, Paul M. Safety and effectiveness of one-day later abortion procedures: A retrospective chart review. Contraception 2020. [DOI: 10.1016/j.contraception.2020.03.012] [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: 11/28/2022]
|
19
|
Gailson T, Pandit S, Chandrasekaran S. Griscelli syndrome type 2. QJM 2020; 113:137. [PMID: 31199490 DOI: 10.1093/qjmed/hcz144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- T Gailson
- Department of Pediatrics, Government Multi-Specialty Hospital, Sector 16, Chandigarh, India
| | - S Pandit
- Department of Pediatrics, Government Multi-Specialty Hospital, Sector 16, Chandigarh, India
| | - S Chandrasekaran
- Department of Pediatrics, Government Multi-Specialty Hospital, Sector 16, Chandigarh, India
| |
Collapse
|
20
|
Vadivel T, Dhamodaran M, Kulathooran S, Kavitha S, Amirthaganesan K, Chandrasekaran S, Ilayaraja S, Senguttuvan S. Rhodium(III) complexes derived from complexation of metal with azomethine linkage of chitosan biopolymer Schiff base ligand: Spectral, thermal, morphological and electrochemical studies. Carbohydr Res 2020; 487:107878. [DOI: 10.1016/j.carres.2019.107878] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 11/03/2019] [Accepted: 11/14/2019] [Indexed: 10/25/2022]
|
21
|
Chandrasekaran S, Sankaran Pillai G, Baskaran R, Venkatraman B. UNCERTAINTY EVALUATION IN DOSE ASSESSMENT DUE TO SPATIAL DISTRIBUTION OF NORM IN BEACH SANDS OF SOUTHEAST COAST OF INDIA: A PROBABILISTIC APPROACH. Radiat Prot Dosimetry 2019; 187:482-498. [PMID: 31711198 DOI: 10.1093/rpd/ncz189] [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] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 08/06/2019] [Accepted: 08/07/2019] [Indexed: 06/10/2023]
Abstract
A study on radionuclide distribution along coastal stretch in high background areas is constantly attracted to many researchers around the world. In the present study, the concentration of radionuclides in beach sands along the southeast coastal region of India has been studied in detail. Concentration of radionuclides is measured using gamma spectrometry at 148 pre-determined locations. It is found that 238U and 232Th concentrations are varying in the range from 3 (BDL) to 298.9 and 1150.2 Bq kg-1, respectively. Concentration of 40K in beach sand varied from 11 to 1743.4 Bq kg-1. The measured activity levels of radionuclides were compared with earlier studies carried out by various researchers in the same region under study. The related radiological parameters of interest were also determined and compared with the internationally recommended values. With an increase in emphasis on quality in dose assessment methods, dose to human population living in the vicinity requires uncertainty evaluation, which is carried out by taking into account variation in the activity values. This study would serve as a baseline radiological mapping for the southeast coast region of India for environmental impact assessment prior to plan of nuclear facility in the future.
Collapse
Affiliation(s)
- S Chandrasekaran
- Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam, Tamil Nadu, India
| | - G Sankaran Pillai
- Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam, Tamil Nadu, India
| | - R Baskaran
- Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam, Tamil Nadu, India
| | - B Venkatraman
- Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam, Tamil Nadu, India
| |
Collapse
|
22
|
Pillai GS, Chandrasekaran S, Baskaran R, Venkatraman B, Deepu R. A REVIEW ON 210Po AND 210Pb IN INDIAN SEAFOOD AND DOSE TO CONSUMERS. Radiat Prot Dosimetry 2019; 187:139-153. [PMID: 31135907 DOI: 10.1093/rpd/ncz149] [Citation(s) in RCA: 1] [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] [Received: 11/14/2018] [Revised: 04/08/2019] [Accepted: 05/08/2019] [Indexed: 06/09/2023]
Abstract
India is the second largest seafood producer in the world marketing more than 7000 edible species. In this regard, commendable studies have been conducted since the 1970s by different research groups and more data are reported. In this work, all the studies on 210Po and 210Pb measurements in abiotic and biotic components of India have been combined and reviewed. The concentrations of 210Po and 210Pb are estimated by radiochemical separation followed by alpha counting. Grain size, season, Tsunami waves and place of sampling have a decisive bearing on 210Po and 210Pb concentration in abiotic components. Plankton shows a higher Kd factor (104) compared to seaweeds and sea grass (103). Pond ecosystems recorded the highest Kd factor (4·3 × 104) compared to other freshwater and marine ecosystems. Bioaccumulation of 210Po and 210Pb varies with respect to variety of seafood. The committed effective dose (CED) calculated for shellfish species maintained a higher range of 2.5 × 10-2 mSv/y to 9.8 × 10-1 mSv/y and for fish species fluctuated from 3.8 × 10-4 mSv/y to 2.0 × 10-1 mSv/y. The studies conducted so far are scattered, and need to be gathered for future reference and planning (i.e. There is not much information available for Kerala, Karnataka, Maharashtra, Gujarat, Andhra, West Bengal and Odessa coast). Therefore, it is strongly recommended that further and more complete research is undertaken to study the bioaccumulation of 210Po and 210Pb from seafood. Overall, the present review concludes that Indian seafood is radiologically safe.
Collapse
Affiliation(s)
- G Sankaran Pillai
- Radiological, Environment and Safety Division (RESD), Health Safety and Environment Group (HSEG), Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute (HBNI), Kalpakkam 603 102, Tamil Nadu, India
| | - S Chandrasekaran
- Radiological, Environment and Safety Division (RESD), Health Safety and Environment Group (HSEG), Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute (HBNI), Kalpakkam 603 102, Tamil Nadu, India
| | - R Baskaran
- Radiological, Environment and Safety Division (RESD), Health Safety and Environment Group (HSEG), Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute (HBNI), Kalpakkam 603 102, Tamil Nadu, India
| | - B Venkatraman
- Radiological, Environment and Safety Division (RESD), Health Safety and Environment Group (HSEG), Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute (HBNI), Kalpakkam 603 102, Tamil Nadu, India
| | - R Deepu
- Radiological, Environment and Safety Division (RESD), Health Safety and Environment Group (HSEG), Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute (HBNI), Kalpakkam 603 102, Tamil Nadu, India
| |
Collapse
|
23
|
Baalamurugan J, Ganesh Kumar V, Chandrasekaran S, Balasundar S, Venkatraman B, Padmapriya R, Bupesh Raja VK. Utilization of induction furnace steel slag in concrete as coarse aggregate for gamma radiation shielding. J Hazard Mater 2019; 369:561-568. [PMID: 30818120 DOI: 10.1016/j.jhazmat.2019.02.064] [Citation(s) in RCA: 14] [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] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 02/18/2019] [Accepted: 02/19/2019] [Indexed: 06/09/2023]
Abstract
The present investigation highlights the utilization of Induction Furnace (IF) steel slag as a partial replacement for coarse aggregate in concrete. The concrete blocks of size 150 × 150 × 50 mm were casted and the effect of density, compressive strength, linear attenuation coefficient, Gamma Attenuation Factor (GAF) and Half Value Layer (HVL) has been explored. Gamma attenuation measurements were carried out using NaI (Tl) based gamma detector. Gamma ray source 60Co emitting two gamma energies 1.17 and 1.33 MeV was used for radiation measurements. The results of this present study shows that 50% of IF steel slag replacement increases the density (2.81 g/cm3) and compressive strength (29.11 N/mm2). The Linear attenuation coefficient (0.1953 cm-1-0.2236 cm-1) and GAF (0.6343-0.6710) is higher at 50% replacement of IF steel slag than conventional concrete. HVL values were also having positive impact in 50% replacement of IF steel slag (3.10 cm) in concrete than conventional concrete (3.55 cm). The partial replacement of IF steel slag as coarse aggregate in concrete is effective in gamma shielding.
Collapse
Affiliation(s)
- J Baalamurugan
- Nanoscience and Materials Chemistry Division - Centre for Ocean Research, Sathyabama Institute of Science and Technology, Chennai - 600119, India
| | - V Ganesh Kumar
- Nanoscience and Materials Chemistry Division - Centre for Ocean Research, Sathyabama Institute of Science and Technology, Chennai - 600119, India.
| | - S Chandrasekaran
- HBNI, Health Safety and Environment Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
| | - S Balasundar
- HBNI, Health Safety and Environment Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
| | - B Venkatraman
- HBNI, Health Safety and Environment Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
| | - R Padmapriya
- Department of Civil Engineering Sathyabama Institute of Science and Technology, Chennai - 600119,India
| | - V K Bupesh Raja
- Department of Automobile Engineering, Sathyabama Institute of Science and Technology, Chennai, 600119, India
| |
Collapse
|
24
|
Chandrasekaran S, Kaeffer N, Cagnon L, Aldakov D, Fize J, Nonglaton G, Baleras F, Mailley P, Artero V. A robust ALD-protected silicon-based hybrid photoelectrode for hydrogen evolution under aqueous conditions. Chem Sci 2019; 10:4469-4475. [PMID: 31057774 PMCID: PMC6482884 DOI: 10.1039/c8sc05006f] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [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: 11/09/2018] [Accepted: 03/11/2019] [Indexed: 01/09/2023] Open
Abstract
Hybrid systems combining molecular catalysts with inorganic materials is a promising solution towards cheap yet efficient and stable photoelectrochemical hydrogen production.
Hydrogen production through direct sunlight-driven water splitting in photo-electrochemical cells (PECs) is a promising solution for energy sourcing. PECs need to fulfill three criteria: sustainability, cost-effectiveness and stability. Here we report an efficient and stable photocathode platform for H2 evolution based on Earth-abundant elements. A p-type silicon surface was protected by atomic layer deposition (ALD) with a 15 nm TiO2 layer, on top of which a 300 nm mesoporous TiO2 layer was spin-coated. The cobalt diimine–dioxime molecular catalyst was covalently grafted onto TiO2 through phosphonate anchors and an additional 0.2 nm ALD-TiO2 layer was applied for stabilization. This assembly catalyzes water reduction into H2 in phosphate buffer (pH 7) with an onset potential of +0.47 V vs. RHE. The resulting current density is –1.3 ± 0.1 mA cm–2 at 0 V vs. RHE under AM 1.5 solar irradiation, corresponding to a turnover number of 260 per hour of operation and a turnover frequency of 0.071 s–1.
Collapse
Affiliation(s)
- Soundarrajan Chandrasekaran
- Université Grenoble Alpes , CNRS , CEA , Laboratoire de Chimie et Biologie des Métaux , 17 rue des Martyrs , 38000 Grenoble , France . .,Université Grenoble Alpes , CEA-LETI/DTBS , Laboratoire Chimie , Capteurs et Biomatériaux , 17 rue des Martyrs , 38000 Grenoble , France
| | - Nicolas Kaeffer
- Université Grenoble Alpes , CNRS , CEA , Laboratoire de Chimie et Biologie des Métaux , 17 rue des Martyrs , 38000 Grenoble , France .
| | - Laurent Cagnon
- Université Grenoble Alpes , CNRS , Institut NEEL , UPR2940 , 25 rue des Martyrs BP 166 , 38000 Grenoble , France
| | - Dmitry Aldakov
- Université Grenoble Alpes , CNRS , CEA , INAC-SyMMES , 38000 Grenoble , France
| | - Jennifer Fize
- Université Grenoble Alpes , CNRS , CEA , Laboratoire de Chimie et Biologie des Métaux , 17 rue des Martyrs , 38000 Grenoble , France .
| | - Guillaume Nonglaton
- Université Grenoble Alpes , CEA-LETI/DTBS , Laboratoire Chimie , Capteurs et Biomatériaux , 17 rue des Martyrs , 38000 Grenoble , France
| | - François Baleras
- Université Grenoble Alpes , CEA-LETI/DTBS , Laboratoire Chimie , Capteurs et Biomatériaux , 17 rue des Martyrs , 38000 Grenoble , France
| | - Pascal Mailley
- Université Grenoble Alpes , CEA-LETI/DTBS , Laboratoire Chimie , Capteurs et Biomatériaux , 17 rue des Martyrs , 38000 Grenoble , France
| | - Vincent Artero
- Université Grenoble Alpes , CNRS , CEA , Laboratoire de Chimie et Biologie des Métaux , 17 rue des Martyrs , 38000 Grenoble , France .
| |
Collapse
|
25
|
Laitman BM, Chandrasekaran S, Rifkin R, Barnum K, Thomas DC, Meah YS. Benefits of a Physician-Scientist-Tailored Curriculum at a Medical Student-Run Free Clinic. Med Sci Educ 2019; 29:9-10. [PMID: 34457440 PMCID: PMC8368602 DOI: 10.1007/s40670-018-00668-z] [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] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We designed a curriculum to help sustain pre-clinical knowledge for MD/PhD trainees in their graduate training phase while securing regular providers for our student-run free clinic. MD/PhD involvement increased from 1.91 to 2.45 students-per-clinic-day following implementation, and participants affirmed increased preparedness and comfort entering medical school clinical clerkships.
Collapse
Affiliation(s)
- B. M. Laitman
- Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029 USA
| | - S. Chandrasekaran
- Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029 USA
| | - R. Rifkin
- Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029 USA
| | - K. Barnum
- Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029 USA
| | - D. C. Thomas
- Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029 USA
| | - Y. S. Meah
- Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029 USA
| |
Collapse
|
26
|
Ng SM, Ayoola OO, McGuigan MP, Chandrasekaran S. A multicentre study evaluating the risk and prevalence of diabetic retinopathy in children and young people with type 1 diabetes mellitus. Diabetes Metab Syndr 2019; 13:744-746. [PMID: 30641800 DOI: 10.1016/j.dsx.2018.11.063] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Accepted: 11/30/2018] [Indexed: 11/20/2022]
Abstract
INTRODUCTION There is currently limited data published on the prognostic factors and prevalence of diabetic eye disease in children and young people (CYP) with Type 1 diabetes mellitus (T1DM), yet diabetic retinopathy remains one of the commonest causes of blindness in young adults. The aim of this study was to determine the risk and prevalence of diabetic retinopathy (DR) and to evaluate the risk factors associated with diabetic retinopathy in CYP with T1DM. METHODS All CYP with Type 1 diabetes between 12 and 18 years of age, registered with the regional diabetic retinopathy screening programme were evaluated from 2012 to 2013 in four diabetes units within the north west region of the United Kingdom. Patients who had evidence of diabetic retinopathy were reviewed to identify risk factors for presence or absence of diabetic retinopathy. RESULTS 237 patients between the ages 12-18 years were included in the. The prevalence of diabetic retinopathy was 11%. Out of 27 patients with evidence of diabetic retinopathy, 44% were reported as background changes and 56% had pre-proliferative DR. Significant risk factors for diabetic retinopathy disease in the population using univariate analyses were duration of diabetes, puberty, age at diagnosis and mean HbA1c in the preceding 12 months. Multivariate logistic regression analysis found age of diagnosis (p = 0.04) and mean HbA1c as significant independent risk factors for presence of diabetic retinopathy (p = 0.02). CONCLUSIONS The prevalence of diabetic retinopathy in this paediatric population was 11%. Early age at diagnosis and poor metabolic control are independent risk factors for diabetic retinopathy.
Collapse
Affiliation(s)
- S M Ng
- Department of Paediatrics, Southport and Ormskirk NHS Trust, United Kingdom.
| | - O O Ayoola
- Department of Paediatrics, Lancashire Teaching Hospitals NHS Foundation Trust, United Kingdom
| | - M P McGuigan
- Department of Paediatrics, Mid Cheshire Hospitals NHS Foundation Trust, United Kingdom
| | - S Chandrasekaran
- Department of Paediatrics, East Cheshire NHS Trust, United Kingdom
| |
Collapse
|
27
|
Chandrasekaran S, Basu P, Krishnan H, Sivasubramanian K, Baskaran R, Venkatraman B. Development of Gadolinium (neutron poison) monitoring system for fuel reprocessing facilities: Computational model and validation with experiments. Progress in Nuclear Energy 2018. [DOI: 10.1016/j.pnucene.2018.04.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
28
|
Chandrasekaran S, Sasaki M, Sapkota B, Pollack B. 178 PI3-kinase signaling modulates the induction of MHC molecules by IFN-gamma. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.183] [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]
|
29
|
Sankaran Pillai G, Chandrasekaran S, Sivasubramanian K, Baskaran R, Venkatraman B. A REVIEW ON VARIATION OF NATURAL RADIOACTIVITY ALONG THE SOUTHEAST COAST OF TAMIL NADU FOR THE PAST 4 DECADES (1974-2016). Radiat Prot Dosimetry 2018; 179:125-135. [PMID: 29069491 DOI: 10.1093/rpd/ncx233] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Accepted: 09/30/2017] [Indexed: 06/07/2023]
Abstract
This review deals with natural radioactivity variation along the southeast coast of Tamil Nadu for the past four decades (1974-2016). About 40 research works have been conducted along the coast since 1974 in various environmental matrices using a variety of experimental methods. For these measurements researchers are adopted different experimental methods. The measured gamma dose rate ranged from 30 to 8700 nGy/h. The mean specific activity of 238U, 232Th and 40K was found to be 58.8 ± 28.7, 465.2 ± 147.3 and 311.2 ± 27.8 Bq/kg, respectively. The calculated annual exposure rate ranged from 0.29 to 12.8 mSv/y with the mean value of 3.7 mSv/y which is above the global average of 2.4 mSv/y as reported by United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) (Report to General Assembly, Annex B Exposures of the public and workers from various sources of radiation. United Nations, New York (2008)). Plant food items recorded low 210Po activities as compared to seafood organisms. Grain size, season and place of sampling have a decisive bearing on coastal radioactivity. Therefore, it is concluded from the review data that there is an appreciable elevation in background radiation level in the coastal region. This review suggests that new radiological surveys using improved methodology that cover the entire coastal stretch are needed.
Collapse
Affiliation(s)
- G Sankaran Pillai
- Radiological Safety Division (RSD), Health Safety and Environment Group (HSEG), Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute (HBNI), Kalpakkam 603102, Tamil Nadu, India
| | - S Chandrasekaran
- Radiological Safety Division (RSD), Health Safety and Environment Group (HSEG), Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute (HBNI), Kalpakkam 603102, Tamil Nadu, India
| | - K Sivasubramanian
- Radiological Safety Division (RSD), Health Safety and Environment Group (HSEG), Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute (HBNI), Kalpakkam 603102, Tamil Nadu, India
| | - R Baskaran
- Radiological Safety Division (RSD), Health Safety and Environment Group (HSEG), Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute (HBNI), Kalpakkam 603102, Tamil Nadu, India
| | - B Venkatraman
- Radiological Safety Division (RSD), Health Safety and Environment Group (HSEG), Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute (HBNI), Kalpakkam 603102, Tamil Nadu, India
| |
Collapse
|
30
|
Huse HK, Miller SA, Chandrasekaran S, Hindler JA, Lawhon SD, Bemis DA, Westblade LF, Humphries RM. Evaluation of Oxacillin and Cefoxitin Disk Diffusion and MIC Breakpoints Established by the Clinical and Laboratory Standards Institute for Detection of mecA-Mediated Oxacillin Resistance in Staphylococcus schleiferi. J Clin Microbiol 2018; 56:e01653-17. [PMID: 29187565 PMCID: PMC5786728 DOI: 10.1128/jcm.01653-17] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [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: 10/17/2017] [Accepted: 11/24/2017] [Indexed: 01/30/2023] Open
Abstract
Staphylococcus schleiferi is a beta-hemolytic, coagulase-variable colonizer of small animals that can cause opportunistic infections in humans. In veterinary isolates, the rate of mecA-mediated oxacillin resistance is significant, with reported resistance rates of >39%. The goal of this study was to evaluate oxacillin and cefoxitin disk diffusion (DD) and MIC breakpoints for detection of mecA-mediated oxacillin resistance in 52 human and 38 veterinary isolates of S. schleiferi Isolates were tested on multiple brands of commercial media and according to Clinical and Laboratory Standards Institute (CLSI) methods. Zone diameters and MIC values were interpreted using CLSI breakpoints (CLSI, Performance Standards for Antimicrobial Susceptibility Testing. M100-S27, 2017) for Staphylococcus aureus/Staphylococcus lugdunensis, coagulase-negative staphylococci (CoNS), and Staphylococcus pseudintermedius Results were compared to those of mecA PCR. Twenty-nine of 90 (32%) isolates were mecA positive. Oxacillin inhibition zone sizes and MICs interpreted by S. pseudintermedius breakpoints reliably differentiated mecA-positive and mecA-negative isolates, with a categorical agreement (CA) of 100% and no very major errors (VMEs) or major errors (MEs) for all media. For cefoxitin DD results interpreted using S. aureus/S. lugdunensis and CoNS breakpoints, CA values were 85% and 75%, respectively, and there were 72% and 64% VMEs, respectively, and 0 MEs. For cefoxitin MICs interpreted using S. aureus/S. lugdunensis breakpoints, CA was 81%, and there were 60% VMEs and no MEs. Our data demonstrate that oxacillin DD or MIC testing methods using the current S. pseudintermedius breakpoints reliably identify mecA-mediated oxacillin resistance in S. schleiferi, while cefoxitin DD and MIC testing methods perform poorly.
Collapse
Affiliation(s)
- H K Huse
- UCLA David Geffen School of Medicine, Los Angeles, California, USA
| | - S A Miller
- UCLA David Geffen School of Medicine, Los Angeles, California, USA
| | - S Chandrasekaran
- UCLA David Geffen School of Medicine, Los Angeles, California, USA
| | - J A Hindler
- UCLA David Geffen School of Medicine, Los Angeles, California, USA
| | - S D Lawhon
- Texas A&M University College of Veterinary Medicine, College Station, Texas, USA
| | - D A Bemis
- University of Tennessee College of Veterinary Medicine, Knoxville, Tennessee, USA
| | | | - R M Humphries
- UCLA David Geffen School of Medicine, Los Angeles, California, USA
| |
Collapse
|
31
|
Gul MZ, Chandrasekaran S, Manjulatha K, Bhat MY, Maurya R, Qureshi IA, Ghazi IA. Antiproliferative and Apoptosis-inducing Effects of Abrus precatorius Against Human Monocytic Leukaemia (THP-1) Cell Line. Indian J Pharm Sci 2018. [DOI: 10.4172/pharmaceutical-sciences.1000359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
|
32
|
Kulkarni NM, Malampati S, Mahat MYA, Chandrasekaran S, Raghul J, Khan AA, Krishnan UM, Narayanan S. Altered pharmacokinetics of rosiglitazone in a mouse model of non-alcoholic fatty liver disease. Drug Metab Pers Ther 2017; 31:165-71. [PMID: 27522101 DOI: 10.1515/dmpt-2016-0008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Accepted: 06/24/2016] [Indexed: 01/11/2023]
Abstract
BACKGROUND Severe forms of non-alcoholic fatty liver disease (NAFLD) adversely affect the liver physiology and hence the pharmacokinetics of drugs. Here, we investigated the effect of NAFLD on the pharmacokinetics of rosiglitazone, an insulin sensitizer used in the treatment of type 2 diabetes. METHODS Male C57BL/6 mice were divided into two groups. The first group (n=14) was fed with normal chow feed and the second group (n=14) was fed with 60% high-fat diet (HFD) and 40% high fructose liquid (HFL) for 60 days to induce NAFLD. The development of NAFLD was confirmed by histopathology, liver triglyceride levels and biochemical estimations, and used for pharmacokinetic investigations. Rosiglitazone was administered orally at 30 mg/kg dose. At predetermined time points, blood was collected and rosiglitazone concentrations were determined using LC/MS/MS. Plasma concentrations were subjected to non-compartmental analysis using Phoenix WinNonlin (6.3), and the area under the plasma concentration-time curve (AUC) was calculated by the linear-up log-down method. RESULTS HFD and HFL diet successfully induced NAFLD in mice. Rosiglitazone pharmacokinetics in NAFLD animals were altered significantly as compared to healthy mice. Rosiglitazone exposure increased significantly in NAFLD mice (2.5-fold higher AUC than healthy mice). The rosiglitazone oral clearance was significantly lower and the mean plasma half-life was significantly longer in NAFLD mice as compared to healthy mice. CONCLUSIONS The NAFLD mouse model showed profound effects on rosiglitazone pharmacokinetics. The magnitude of change in rosiglitazone pharmacokinetics is similar to that observed in humans with moderate to severe liver disease. The present animal model can be utilized to study the NAFLD-induced changes in the pharmacokinetics of different drugs.
Collapse
|
33
|
Paramasivam M, Deepa M, Selvi C, Chandrasekaran S. Dissipation kinetics of beta-cyfluthrin and imidacloprid in tea and their transfer from processed tea to infusion. Ecotoxicol Environ Saf 2017; 144:531-536. [PMID: 28683415 DOI: 10.1016/j.ecoenv.2017.06.065] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 06/23/2017] [Accepted: 06/26/2017] [Indexed: 06/07/2023]
Abstract
Dissipation kinetics of mixed formulation consisting beta-cyfluthrin and imidacloprid in tea crop under an open field ecosystem was investigated. The mixed formulation was applied on tea plant at recommended (27 + 63) and double the recommended (54 + 126g a.i./ha) dose and residues were determined using gas chromatography-electron capture detector and high performance liquid chromatography-photodiode array detector for beta-cyfluthrin and imidacloprid, respectively. The limit of quantification of analytical method was 0.05µg/g and the average recoveries were ranged from 88.36% to 103.49% with relative standard deviations of less than 6% at three spiked levels. The experimental results showed that in the green tea leaves imidacloprid dissipated faster than beta-cyfluthrin with the half-life ranging between 1.20-1.39 and 2.89-3.15days, respectively. The beta-cyfluthrin residues present in the processed tea not transferred into the tea infusion during the infusion process and imidacloprid transferred in the range 43.12-49.7%. On the basis of the transfer of residues from processed tea to infusion, a waiting period of 17 days for tea plucking after pesticide application at recommended dose may be suggested.
Collapse
Affiliation(s)
- M Paramasivam
- Pesticide Toxicology Laboratory, Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India.
| | - M Deepa
- Pesticide Toxicology Laboratory, Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
| | - C Selvi
- Pesticide Toxicology Laboratory, Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
| | - S Chandrasekaran
- Pesticide Toxicology Laboratory, Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
| |
Collapse
|
34
|
Chandrasekaran S, Kyaw NTT, Harries AD, Yee IA, Ellan P, Kurusamy T, Yusoff N, Mburu G, Mohammad WMZW, Suleiman A. Enrolment and retention of people who inject drugs in the Needle & Syringe Exchange Programme in Malaysia. Public Health Action 2017; 7:155-160. [PMID: 28695090 DOI: 10.5588/pha.17.0003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 01/14/2017] [Accepted: 03/21/2017] [Indexed: 11/10/2022] Open
Abstract
Setting: Needle and Syringe Exchange Programme (NSEP) implemented by non-governmental organisations in Malaysia. Objectives: To determine enrolment, characteristics and retention in the NSEP of people who inject drugs (PWID) between 2013 and 2015. Design: Retrospective cohort study. Results: There were 20 946 PWID, with a mean age of 38 years. The majority were male (98%) and of Malay ethnicity (92%). Follow-up data were available for 20 761 PWID. Annual retention of newly enrolled PWID for each year was respectively 85%, 87% and 78% for 2013, 2014 and 2015, although annual enrolment over these years declined from 10 724 to 6288 to 3749. Total person-years (py) of follow-up were 27 806, with loss to follow-up of 40 per 100 py. Cumulative probability of retention in NSEP was 66% at 12 months, 45% at 24 months and 26% at 36 months. Significantly higher loss to follow-up rates were observed in those aged 15-24 years or ⩾50 years, females, transgender people and non-Malay ethnic groups. Conclusion: Annual retention of new PWID on NSEP was impressive, although enrolment declined over the 3 years of the study and cumulative loss to follow-up was high. A better understanding of these programmatic outcomes is required.
Collapse
Affiliation(s)
| | - N T T Kyaw
- International Union Against Tuberculosis and Lung Disease, Myanmar Country Office, Mandalay, Myanmar
| | - A D Harries
- International Union Against Tuberculosis and Lung Disease, Paris, France.,London School of Hygiene & Tropical Medicine, London, UK
| | - I A Yee
- Malaysian AIDS Council, Kuala Lumpur, Malaysia
| | - P Ellan
- Malaysian AIDS Council, Kuala Lumpur, Malaysia
| | - T Kurusamy
- Malaysian AIDS Council, Kuala Lumpur, Malaysia
| | - N Yusoff
- Malaysian AIDS Council, Kuala Lumpur, Malaysia
| | - G Mburu
- Department of Health Research, Lancaster University, Lancaster, UK
| | - W M Z W Mohammad
- School of Medical Sciences, Universiti Sains Malaysia, Penang, Malaysia
| | - A Suleiman
- Ministry of Health Malaysia, Putrajaya, Malaysia
| |
Collapse
|
35
|
Shpigler HY, Saul MC, Murdoch EE, Cash-Ahmed AC, Seward CH, Sloofman L, Chandrasekaran S, Sinha S, Stubbs LJ, Robinson GE. Behavioral, transcriptomic and epigenetic responses to social challenge in honey bees. Genes, Brain and Behavior 2017; 16:579-591. [DOI: 10.1111/gbb.12379] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 03/03/2017] [Accepted: 03/14/2017] [Indexed: 01/06/2023]
Affiliation(s)
- H. Y. Shpigler
- Carl R. Woese Institute for Genomic Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
| | - M. C. Saul
- Carl R. Woese Institute for Genomic Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
| | - E. E. Murdoch
- Carl R. Woese Institute for Genomic Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
| | - A. C. Cash-Ahmed
- Carl R. Woese Institute for Genomic Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
| | - C. H. Seward
- Carl R. Woese Institute for Genomic Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
- Department of Cell and Developmental Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
| | - L. Sloofman
- Carl R. Woese Institute for Genomic Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
- Center for Biophysics and Quantitative Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
| | - S. Chandrasekaran
- Harvard Society of Fellows; Harvard University; Cambridge MA USA
- Faculty of Arts and Sciences; Harvard University; Cambridge MA USA
- Broad Institute of MIT and Harvard; Cambridge MA USA
- Department of Biomedical Engineering; University of Michigan; Ann Arbor MI USA
| | - S. Sinha
- Carl R. Woese Institute for Genomic Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
- Center for Biophysics and Quantitative Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
- Department of Computer Science; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
- Department of Entomology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
| | - L. J. Stubbs
- Carl R. Woese Institute for Genomic Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
- Department of Cell and Developmental Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
- Neuroscience Program; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
| | - G. E. Robinson
- Carl R. Woese Institute for Genomic Biology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
- Department of Entomology; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
- Neuroscience Program; University of Illinois at Urbana-Champaign (UIUC); Urbana IL USA
| |
Collapse
|
36
|
Chandrasekaran S. Meet Our Editorial Board Member. CURR ORG CHEM 2017. [DOI: 10.2174/138527282110170330230532] [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: 11/22/2022]
|
37
|
Pannico M, Rea I, Chandrasekaran S, Musto P, Voelcker NH, De Stefano L. Electroless Gold-Modified Diatoms as Surface-Enhanced Raman Scattering Supports. Nanoscale Res Lett 2016; 11:315. [PMID: 27356562 PMCID: PMC4927532 DOI: 10.1186/s11671-016-1539-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Accepted: 06/24/2016] [Indexed: 05/23/2023]
Abstract
Porous biosilica from diatom frustules is well known for its peculiar optical and mechanical properties. In this work, gold-coated diatom frustules are used as low-cost, ready available, functional support for surface-enhanced Raman scattering. Due to the morphology of the nanostructured surface and the smoothness of gold deposition via an electroless process, an enhancement factor for the p-mercaptoaniline Raman signal of the order of 10(5) is obtained.
Collapse
Affiliation(s)
- Marianna Pannico
- />Institute for Polymers, Composite and Biomaterials, Pozzuoli, NA Italy
| | - Ilaria Rea
- />Institute for Microelectronics and Microsystems, Via P. Castellino 131, Naples, 80131 Italy
| | | | - Pellegrino Musto
- />Institute for Polymers, Composite and Biomaterials, Pozzuoli, NA Italy
| | - Nicolas H. Voelcker
- />Future Industries Institute, University of South Australia, Mawson Lakes Blvd, Adelaide, Australia
| | - Luca De Stefano
- />Institute for Microelectronics and Microsystems, Via P. Castellino 131, Naples, 80131 Italy
| |
Collapse
|
38
|
Rea I, Terracciano M, Chandrasekaran S, Voelcker NH, Dardano P, Martucci NM, Lamberti A, De Stefano L. Bioengineered Silicon Diatoms: Adding Photonic Features to a Nanostructured Semiconductive Material for Biomolecular Sensing. Nanoscale Res Lett 2016; 11:405. [PMID: 27637897 PMCID: PMC5025415 DOI: 10.1186/s11671-016-1624-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Accepted: 09/07/2016] [Indexed: 05/10/2023]
Abstract
Native diatoms made of amorphous silica are first converted into silicon structures via magnesiothermic process, preserving the original shape: electron force microscopy analysis performed on silicon-converted diatoms demonstrates their semiconductor behavior. Wet surface chemical treatments are then performed in order to enhance the photoluminescence emission from the resulting silicon diatoms and, at the same time, to allow the immobilization of biological probes, namely proteins and antibodies, via silanization. We demonstrate that light emission from semiconductive silicon diatoms can be used for antibody-antigen recognition, endorsing this material as optoelectronic transducer.
Collapse
Affiliation(s)
- Ilaria Rea
- Institute for Microelectronics and Microsystems, Via P. Castellino 131, Naples, 80131 Italy
| | - Monica Terracciano
- Institute for Microelectronics and Microsystems, Via P. Castellino 131, Naples, 80131 Italy
| | | | - Nicolas H. Voelcker
- Future Industries Institute, University of South Australia, Mawson Lakes Blvd, Adelaide, Australia
| | - Principia Dardano
- Institute for Microelectronics and Microsystems, Via P. Castellino 131, Naples, 80131 Italy
| | - Nicola M. Martucci
- Department of Biochemistry and Medical Biology, University of Naples “Federico II”, via Pansini 5, 80131, Naples, Italy
| | - Annalisa Lamberti
- Department of Biochemistry and Medical Biology, University of Naples “Federico II”, via Pansini 5, 80131, Naples, Italy
| | - Luca De Stefano
- Institute for Microelectronics and Microsystems, Via P. Castellino 131, Naples, 80131 Italy
| |
Collapse
|
39
|
Balasundaram K, Raja R, Zhu Q, Chandrasekaran S, Zhou H. New global asymptotic stability of discrete-time recurrent neural networks with multiple time-varying delays in the leakage term and impulsive effects. Neurocomputing 2016. [DOI: 10.1016/j.neucom.2016.06.040] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
40
|
James R, Avudaiappan S, Assistant Professor A, Natarajan K, Chandrasekaran S. Multifocal Tuberculosis. J Assoc Physicians India 2016; 64:83-84. [PMID: 27762524] [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] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Multifocal Tuberculosis represents the many faces of an age old disease. It is characterized by the presence of large multifocal tuberculous areas in same or different organs. A 50 year old male patient, presented with features suggestive of renal failure, low grade fever and cough with mucoid expectoration. He was found to have pulmonary TB, genitourinary TB and tuberculous lymphadenitis. He was started on antituberculous treatment to which he showed good response.
Collapse
Affiliation(s)
| | | | | | - Kumar Natarajan
- Professor, Department of General Medicine, Coimbatore Medical College Hospital, Coimbatore, Tamil Nadu
| | - S Chandrasekaran
- Professor, Department of General Medicine, Coimbatore Medical College Hospital, Coimbatore, Tamil Nadu
| |
Collapse
|
41
|
Chandrasekaran S, Nann T, Voelcker NH. Silicon Nanowire Photocathodes for Photoelectrochemical Hydrogen Production. Nanomaterials (Basel) 2016; 6:E144. [PMID: 28335272 PMCID: PMC5224617 DOI: 10.3390/nano6080144] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 06/27/2016] [Revised: 07/29/2016] [Accepted: 08/03/2016] [Indexed: 01/17/2023]
Abstract
The performance of silicon for water oxidation and hydrogen production can be improved by exploiting the antireflective properties of nanostructured silicon substrates. In this work, silicon nanowires were fabricated by metal-assisted electroless etching of silicon. An enhanced photocurrent density of -17 mA/cm² was observed for the silicon nanowires coated with an iron sulphur carbonyl catalyst when compared to bare silicon nanowires (-5 mA/cm²). A substantial amount of 315 µmol/h hydrogen gas was produced at low bias potentials for the silicon nanowires coated with an iron sulphur carbonyl catalyst.
Collapse
Affiliation(s)
| | - Thomas Nann
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington 6140, New Zealand.
| | - Nicolas H Voelcker
- Future Industries Institute, University of South Australia, South Australia 5095, Australia.
| |
Collapse
|
42
|
Saraswathi K, Chandrasekaran S. Biomass yielding potential of naturally regenerated Prosopis juliflora tree stands at three varied ecosystems in southern districts of Tamil Nadu, India. Environ Sci Pollut Res Int 2016; 23:9440-9447. [PMID: 26797948 DOI: 10.1007/s11356-016-6099-1] [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] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Accepted: 01/11/2016] [Indexed: 06/05/2023]
Abstract
Fuel energy demand is of great concern in recent times due to the depletion of fossil fuel resources. Biomass serves as widely available primary renewable energy source. Hence, a study was performed to assess the above-ground biomass yielding capability of fuel wood tree Prosopis juliflora in three varied ecosystems viz., coastal, fallow land and riparian ecosystems in southern districts of Tamil Nadu. The results showed that the biomass production potential and above-ground net primary productivity of P. juliflora depend on the age of the tree stands and the nature of ecosystem. A higher biomass yield was observed for P. juliflora trees with 5 to 10 years old when compared to less than 5 years of their age. Among the three ecosystems, the maximum biomass production was recorded in riparian ecosystem. The stands with less than 5-year-old P. juliflora trees gave 1.40 t/ha, and 5- to 10-year-old tree stands produced 27.69 t/ha in riparian ecosystem. Above-ground net primary productivity of both the age groups was high in fallow land ecosystem. In riparian ecosystem, the wood showed high density and low sulphur content than the other two ecosystems. Hence, P. juliflora biomass can serve as an environmentally and economically feasible fuel as well as their utilization proffers an effective means to control its invasiveness.
Collapse
Affiliation(s)
- K Saraswathi
- PG and Research Department of Botany, Thiagarajar College, Madurai, 625 009, India.
| | - S Chandrasekaran
- Department of Plant Sciences, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625021, India
| |
Collapse
|
43
|
Chandrasekaran S, Muthu IV, Enoch V. Host–guest association of Morin with β-CD and C-hexylpyrogallol[4]arene: Structure of the complexes and the effect of pH. J STRUCT CHEM+ 2016. [DOI: 10.1134/s0022476615070136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
44
|
Gulati K, Maher S, Chandrasekaran S, Findlay DM, Losic D. Conversion of titania (TiO2) into conductive titanium (Ti) nanotube arrays for combined drug-delivery and electrical stimulation therapy. J Mater Chem B 2016; 4:371-375. [DOI: 10.1039/c5tb02108a] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The conversion of titania (TiO2) nanotubes into titanium (Ti), while preserving their nanotubular structures is demonstrated for proposed application as bone implants and electrodes for combined local drug delivery and electrical stimulation therapy.
Collapse
Affiliation(s)
- Karan Gulati
- School of Chemical Engineering
- University of Adelaide
- Australia
| | - Shaheer Maher
- School of Chemical Engineering
- University of Adelaide
- Australia
- Faculty of Pharmacy
- Assiut University
| | | | - David M. Findlay
- Discipline of Orthopaedics and Trauma
- University of Adelaide
- Australia
| | - Dusan Losic
- School of Chemical Engineering
- University of Adelaide
- Australia
| |
Collapse
|
45
|
Walter G, Chandrasekaran S, Collins P, Jagadeesan R, Mohankumar S, Alagusundaram K, Ebert P, Daglish G, Nayak M, Mohan S, Srivastava C, Chadda I, Rajagopal A, Reid R, Subramanian S. The grand challenge of food security - general lessons from a comprehensive approach to protecting stored grain from insect pests in Australia and India. ACTA ACUST UNITED AC 2016. [DOI: 10.5958/0974-8172.2016.00020.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
46
|
Kamaladhasan N, Tyagi BK, Swamy PS, Chandrasekaran S. Studies on the Maintenance of 'Self-Sustained' Mosquito Vector Population in Vaigai River, South India. CURR SCI INDIA 2016. [DOI: 10.18520/cs/v110/i1/53-64] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
47
|
Rhodes JK, Chandrasekaran S, Andrews PJ. Early Changes in Brain Oxygen Tension May Predict Outcome Following Severe Traumatic Brain Injury. Acta Neurochir Suppl 2016; 122:9-16. [PMID: 27165868 DOI: 10.1007/978-3-319-22533-3_2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
We report on the change in brain oxygen tension (PbtO2) over the first 24 h of monitoring in a series of 25 patients with severe traumatic brain injury (TBI) and relate this to outcome. The trend in PbtO2 for the whole group was to increase with time (mean PbtO2 17.4 [1.75] vs 24.7 [1.60] mmHg, first- vs last-hour data, respectively; p = 0.002). However, a significant increase in PbtO2 occurred in only 17 patients (68 %), all surviving to intensive care unit discharge (p = 0.006). Similarly, a consistent increase in PbtO2 with time occurred in only 13 patients, the correlation coefficient for PbtO2 versus time being ≥0.5 for all survivors. There were eight survivors and four non-survivors, with low correlation coefficients (<0.5). Significantly more patients with a correlation coefficient ≥0.5 for PbtO2 versus time survived in intensive care (p = 0.039). The cumulative length of time that PbtO2 was <20 mmHg was not significantly different among these three groups. In conclusion, although for the cohort as a whole PbtO2 increased over the first 24 h, the individual trends of PbtO2 were related to outcome. There was a significant association between improving PbtO2 and survival, despite these patients having cumulative durations of hypoxia similar to those of non-survivors.
Collapse
Affiliation(s)
- J K Rhodes
- Intensive Care Unit, Department of Anaesthesia, Critical Care and Pain Management, Western General Hospital, University of Edinburgh, Edinburgh, UK.
| | - S Chandrasekaran
- Intensive Care Unit, Department of Anaesthesia, Critical Care and Pain Management, Western General Hospital, University of Edinburgh, Edinburgh, UK
| | - P J Andrews
- Intensive Care Unit, Department of Anaesthesia, Critical Care and Pain Management, Western General Hospital, University of Edinburgh, Edinburgh, UK
| |
Collapse
|
48
|
Soundararajan N, Mohan Raj R, Kamaladhasan N, Indhar Saidanyan R, Chandrasekaran S. On-Line Trade of Aesthetic Exotic Organisms: Sword of Damocles? CURR SCI INDIA 2015. [DOI: 10.18520/v109/i8/1404-1410] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
49
|
Soundararajan N, Mohan Raj R, Kamaladhasan N, Indhar Saidanyan R, Chandrasekaran S. On-Line Trade of Aesthetic Exotic Organisms: Sword of Damocles? CURR SCI INDIA 2015. [DOI: 10.18520/cs/v109/i8/1404-1410] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
50
|
Chandrasekaran S, Macdonald TJ, Gerson AR, Nann T, Voelcker NH. Boron-Doped Silicon Diatom Frustules as a Photocathode for Water Splitting. ACS Appl Mater Interfaces 2015; 7:17381-7. [PMID: 26192101 DOI: 10.1021/acsami.5b04640] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
An effective solar-powered silicon device for hydrogen production from water splitting is a priority in light of diminishing fossil fuel vectors. There is increasing demand for nanostructuring in silicon to improve its antireflective properties for efficient solar energy conversion. Diatom frustules are naturally occurring biosilica nanostructures formed by biomineralizing microalgae. Here, we demonstrate magnesiothermic conversion of boron-doped silica diatom frustules from Aulacoseira sp. into nanostructured silicon with retention of the original shape. Hydrogen production was achieved for boron-doped silicon diatom frustules coated with indium phosphide nanocrystal layers and an iron sulfur carbonyl electrocatalyst.
Collapse
|