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Krishnakumar S, Satheesh Herbert Singh D, Nallusamy B, Mohammed Aslam MA. Marine pollution and ecological degradation-issues and challenges. Environ Sci Pollut Res Int 2024:10.1007/s11356-024-33201-4. [PMID: 38625468 DOI: 10.1007/s11356-024-33201-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Affiliation(s)
- S Krishnakumar
- Department of Geology, Malankara Catholic College, Mariagiri, Kaliyakavilai, Kanyakumari District, 629153, Tamil Nadu, India.
| | - D Satheesh Herbert Singh
- Department of Geology, Malankara Catholic College, Mariagiri, Kaliyakavilai, Kanyakumari District, 629153, Tamil Nadu, India
| | - Babu Nallusamy
- Department of Geology, Central University of Karnataka, Kalaburagi, 585367, Karnataka, India
| | - M A Mohammed Aslam
- Department of Geology, Central University of Karnataka, Kalaburagi, 585367, Karnataka, India
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Krishnakumar S, Malavika RN, Nair SV, Menon D, Paul-Prasanth B. Nano-graphene oxide particles induce inheritable anomalies through altered gene expressions involved in oocyte maturation. Nanotoxicology 2024; 18:160-180. [PMID: 38449436 DOI: 10.1080/17435390.2024.2325615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 02/26/2024] [Indexed: 03/08/2024]
Abstract
The inheritable impact of exposure to graphene oxide nanoparticles (GO NPs) on vertebrate germline during critical windows of gamete development remain undetermined to date. Here, we analyzed the transgenerational effects of exposure to nano-graphene oxide particles (nGO) synthesized in house with lateral dimensions 300-600 nm and surface charge of -36.8 mV on different developmental stages of germ cells (GCs): (1) during GCs undergoing early development and differentiation, and (2) during GCs undergoing gametogenesis and maturation in adulthood. Biocompatibility analyses in Japanese medaka embryos showed lethality above 1 µg/ml and also an aberrant increase in germ cell count of both males and females at doses below the lethal dose. However, no lethality or anomalies were evident in adults up to 45 µg/ml. Long term exposure of embryos and adults for 21 days resulted in reduced fecundity. This effect was transmitted to subsequent generations, F1 and F2. Importantly, the inheritable effects of nGO in adults were pronounced at a high dose of 10 µg/ml, while 1 µg/ml showed no impact on the germline indicating lower doses used in this study to be safe. Further, expressions of selected genes that adversely affected oocyte maturation were enhanced in F1 and F2 individuals. Interestingly, the inheritance patterns differed corresponding to the stage at which the fish received the exposure.
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Affiliation(s)
- Sreelakshmi Krishnakumar
- School of Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi Campus, Kerala, India
| | - Raghunath Nair Malavika
- School of Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi Campus, Kerala, India
| | - Shantikumar V Nair
- School of Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi Campus, Kerala, India
| | - Deepthy Menon
- School of Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi Campus, Kerala, India
| | - Bindhu Paul-Prasanth
- School of Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi Campus, Kerala, India
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Krishnan SJA, Nishanth P, Venkatraman A, Krishnakumar S, Priyadharshini M, Musthafa MS. Investigating radiation profiles and conducting risk assessment for ecological and environmental components on Vaan and Koswari islands in the Tuticorin group of islands, India. Environ Monit Assess 2024; 196:139. [PMID: 38206400 DOI: 10.1007/s10661-024-12312-y] [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: 09/05/2023] [Accepted: 01/04/2024] [Indexed: 01/12/2024]
Abstract
Natural radioactive concentration assessment was conducted on sediment, water, and biota obtained on Vaan and Koswari islands in the Tuticorin group of islands, Tamil Nadu, India. For biotic and abiotic components, radiation profiles such as gross alpha, beta, primordial radionuclide, polonium, and lead analyses were performed. The gross α and β range from BDL to 15.18 ± 1.7 Bq/kg and 40.43 ± 4.9 Bq/kg to 105.12 ± 11.7 Bq/kg, respectively. Primordial radionuclides were analyzed using Nal(TI)-based scintillator with PC-MCA, and the concentrations ranged from 13.43 ± 3.3 Bq/kg to 30.97 ± 9.6 Bq/kg with a mean of 21.31 ± 2.7 Bq/kg for 238U; for 232Th, the values ranged from 11.09 ± 2.6 Bq/kg to 33.55 ± 9.5 Bq/kg with an average value of 23.89 ± 3.7 Bq/kg; and for 40 K, the values are 93.33 ± 27.3 Bq/kg to 219.91 ± 39.6 Bq/kg with an average value of 148.27 ± 21.7 Bq/kg. The present study values are lesser than the world average values. 210Po and 210Pb concentrations with an average value were determined to be 33.13 Bq/L and 16.56 Bq/L, 47.55 Bq/L and 22.37 Bq/L in the water sample, and 50.437 Bq kg1 and 62.012 Bq kg1, 46.99 Bq/kg and 58.625 Bq/kg in sediments of Vaan island and Koswari island. The concentrations of 210Po and 210Pb of Pogonias cromis were 19.27 ± 1.5 Bq/kg and 8.27 ± 1.01 Bq/kg, Belonidae 28.54 ± 2.4 Bq/kg and 18.32 ± 2.3 Bq/kg, Lepisosteidae 18.68 ± 1.4 Bq/kg and 11.17 ± 1.8 Bq/kg. The committed effective dosage was determined to be 35.74-54.61 µSv/y for 210Po and 25.39-56.25 µSv/y for 210Pb, in which the 210Pb value is lower; however, the 210Po value is higher than the global average value. The annual committed effective dosage as well as the radiological hazard indices were assessed and found to be much below the global average and the recommended limit, respectively. This research provides an extensive analysis of natural background radiation and establishes a baseline report on the radiological profile of biotic and abiotic factors in the Tuticorin group of islands, namely Vaan and Koswari, in Tamil Nadu, India.
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Affiliation(s)
- S J Athul Krishnan
- Department of Geology, Malankara Catholic College, Mariyagiri Kaliyakkavilai, Kanyakumari, 629 153, India
| | - P Nishanth
- Department of Geology, Malankara Catholic College, Mariyagiri Kaliyakkavilai, Kanyakumari, 629 153, India
| | - Atvr Venkatraman
- Department of Geology, Malankara Catholic College, Mariyagiri Kaliyakkavilai, Kanyakumari, 629 153, India
| | - S Krishnakumar
- Department of Geology, Malankara Catholic College, Mariyagiri Kaliyakkavilai, Kanyakumari, 629 153, India
| | - Marckasagayam Priyadharshini
- Unit of Research in Radiation Biology & Environmental Radioactivity (URRBER), P.G & Research Department of Zoology, The New College (Autonomous), Affiliated to University of Madras, Chennai, Tamil Nadu, 600 014, India
| | - Mohamed Saiyad Musthafa
- Unit of Research in Radiation Biology & Environmental Radioactivity (URRBER), P.G & Research Department of Zoology, The New College (Autonomous), Affiliated to University of Madras, Chennai, Tamil Nadu, 600 014, India.
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Behera D, Krishnakumar S, Anoop A. Occurrence, distribution and sources of petroleum contamination in reef-associated sediments of the Gulf of Mannar, India. Mar Pollut Bull 2023; 196:115576. [PMID: 37813061 DOI: 10.1016/j.marpolbul.2023.115576] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 09/15/2023] [Accepted: 09/20/2023] [Indexed: 10/11/2023]
Abstract
The distribution of saturated hydrocarbons and polycyclic aromatic hydrocarbons (PAHs) was assessed in superficial sediment samples collected from Mandapam island groups, Gulf of Mannar, India. The hydrocarbon distribution pattern and the n-alkane indices (e.g., carbon preference index (CPI) and natural n-alkanes ratio (NAR)) were deployed to differentiate between the biogenic and anthropogenic sources. Petroleum pollution was indicated by the pristane/phytane ratio close to 1. Presence of a prominent unresolved complex mixture (UCM) as well as hopane concentrations further supported this assertion. The evaluation of petrogenic sources of contamination were also comprehended by various diagnostic ratios of PAHs. The sites associated with shipping activities, tourism, and located near the mainland and accessible portions of the islands exhibited high petroleum contamination. Correlation analysis underlines the significance of combining petroleum-specific marker compounds and diagnostic ratios to improve the assessment of human influence on marine ecosystems.
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Affiliation(s)
- Diptimayee Behera
- Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research Mohali, Sector-81, Mohali 140306, Punjab, India
| | - S Krishnakumar
- Department of Geology, Malankara Catholic college, Mariyagiri, Kaliakkavilai, Kanyakumari 629153, Tamil Nadu, India
| | - Ambili Anoop
- Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research Mohali, Sector-81, Mohali 140306, Punjab, India.
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Singh A, Thirumurugesan R, Krishnakumar S, Rani R, Chandramouli S, Parameswaran P, Mythili R. Performance evaluation of plasma nitrided 316L stainless steel during long term high temperature sodium exposure. Nuclear Engineering and Technology 2022. [DOI: 10.1016/j.net.2022.12.019] [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: 12/23/2022]
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Krishnakumar S, Manivannan K. Detection of meningioma tumor images using Modified Empirical Mode Decomposition (MEMD) and convolutional neural networks. IFS 2022. [DOI: 10.3233/jifs-222172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The meningioma brain tumor detection is more important than the other tumor detection such as Glioma and Glioblastoma, due to its high severity level. The tumor pixel density of meningioma tumor is high and it leads to sudden death if it is not detected timely. The meningioma images are detected using Modified Empirical Mode Decomposition- Convolutional Neural Networks (MEMD-CNN) classification approach. This method has the following stages data augmentation, spatial-frequency transformation, feature computations, classifications and segmentation. The brain image samples are increased using data augmentation process for improving the meningioma detection rate. The data augmented images are spatially transformed into frequency format using MEMD transformation method. Then, the external empirical mode features are computed from this transformed image and they are fed into CNN architecture to classify the source brain image into either meningioma or non-meningioma. The pixels belonging tumor category are segmented using morphological opening-closing functions. The meningioma detection system obtains 99.4% of Meningioma Classification Rate (MCR) and 99.3% of Non-Meningioma Classification Rate (NMCR) on the meningioma and non-meningioma images. This MEMD-CNN technique for meningioma identification attains 98.93% of SET, 99.13% of SPT, 99.18% of MSA, 99.14% of PR and 99.13% of FS. From the statistical comparative analysis of the proposed MEMD-CNN system with other conventional detection systems, the proposed method provides optimum tumor segmentation results.
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Affiliation(s)
- S. Krishnakumar
- Department of Electronics and Communication Engineering, Theni Kammavar Sangam College of Technology, Theni, Tamilnadu, India
| | - K. Manivannan
- Department of Computer Science and Engineering, PSNA College of Engineering and Technology, Dindigul, Tamilnadu, India
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Krishnakumar S, Singh DSH, Godson PS, Thanga SG. Emerging pollutants: impact on environment, management, and challenges. Environ Sci Pollut Res Int 2022; 29:72309-72311. [PMID: 36097305 DOI: 10.1007/s11356-022-22859-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Affiliation(s)
- S Krishnakumar
- Department of Geology, Malankara Catholic College, Mariagiri, Kaliyakkavilai, Tamil Nadu, India.
| | | | - Prince S Godson
- Centre for Marine Science and Technology, Manonmaniam Sundaranar University, Rajakkamangalam, Tamil Nadu, India
| | - Salom Gnana Thanga
- Department of Environmental Sciences, University of Kerala, Karyavattom Campus, Thiruvananthapuram, Kerala, India
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Krishnakumar S, Thakur SS, Pais J, Narayanasamy N. An exploration of pulmonary fitness of construction workers in Delhi NCR in light of the building and other construction workers act, 1996. Indian J Public Health 2022; 66:355-357. [PMID: 36149122 DOI: 10.4103/ijph.ijph_2074_21] [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: 11/04/2022] Open
Abstract
Workers in the construction sector are exposed to high concentrations of particulate matter at their workplace. This increases their susceptibility to various respiratory diseases, particularly chronic obstructive pulmonary disease (COPD) and acute respiratory distress syndrome (ARDS). The study reports comparative pulmonary fitness and hematological parameters of the migrant workers in the construction sector versus other sectors in Delhi. Parameters such as forced vital capacity (FVC), forced expiratory volume in 1 s (FEV1), the ratio of FEV1 to FVC, and peak expiratory flow were measured in both groups using a spirometer. We observed significant differences (P < 0.05) in FEV1 and FVC between both groups. The study thus confirms that workers exposed to poor air quality at the construction site are susceptible to respiratory diseases, particularly ARDS. All of this reflects the poor enforcement of the adequate safety measures well enlisted in social legislations such as the Building and Other Construction Workers Act.
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Affiliation(s)
- S Krishnakumar
- Associate Professor, Sri Venkateswara College, University of Delhi, New Delhi, India
| | - Shailaja S Thakur
- Assistant Professor, Department of Economics, Sri Venkateswara College, University of Delhi, New Delhi, India
| | - Jesim Pais
- Director, Society for Social and Economic Research, Sri Venkateswara College, University of Delhi, New Delhi, India
| | - Nandita Narayanasamy
- Associate Professor, Department of Biochemistry, Sri Venkateswara College, University of Delhi, New Delhi, India
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Festus S, D S, K.S A, Krishnakumar S. Comparative Study on the Effectiveness of Azidation Reaction for the Synthesis of Xylo-azidonucleoside Analogues by Mitsunobu and Lithium Azide Method. LETT ORG CHEM 2022. [DOI: 10.2174/1570178619666220621112018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract:
Many therapeutically important nucleoside analogues can be synthesized from versatile azidonucleoside intermediates. We have synthesized 3’-xylo-azidonucleoside analogues of thymidine and 2’-deoxyadenosine via Mitsunobu-DPPA and triflate-lithium azide strategies. On comparing the two azidation strategies on nucleoside analogues, we found that Mitsunobu-DPPA azidation is better than triflate-lithium azide azidation in terms of yield and reaction conditions.
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Affiliation(s)
- Sheneya Festus
- Department of Chemistry, St Albert’s College, Ernakulam, Kerala, India
- Department of Chemistry, St Xavier’s College for Women, Aluva, Kerala, India
| | - Sudheesh D
- Department of Chemistry, St Albert’s College, Ernakulam, Kerala, India
| | - Akshaya K.S
- Department of Chemistry, St Albert’s College, Ernakulam, Kerala, India
| | - S. Krishnakumar
- Department of Chemistry, St Albert’s College, Ernakulam, Kerala, India
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Neelavannan K, Achyuthan H, Sen IS, Krishnakumar S, Gopinath K, Dhanalakshmi R, Rajalakshmi PR, Sajeev R. Distribution and characterization of plastic debris pollution along the Poompuhar Beach, Tamil Nadu, Southern India. Mar Pollut Bull 2022; 175:113337. [PMID: 35093779 DOI: 10.1016/j.marpolbul.2022.113337] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 10/06/2021] [Revised: 01/07/2022] [Accepted: 01/07/2022] [Indexed: 05/26/2023]
Abstract
The present study was carried out to determine the characteristics, distribution, and abundance of plastic debris in 25 sediment samples collected from the Poompuhar beach, southeast coast of India. The result reveals that the mean plastic debris abundance was 42 ± 27 particles/m2 dry weight (dw) (1 SD, n = 25) with higher concentrations in the river mouth. The dominant shapes in the study area were fragment (70.7%), followed by fiber (20.7%), and pellet-shaped (8.6%). The dominant colors of the plastic debris were: white-colored (47%) followed by blue (28%) and green (14%). The study further reveals that the dominant polymer type was polyethylene (PE, 63.4%), followed by nylon (PA, 16.9), polyvinyl chloride (PVC, 15.5%), polypropylene (PP, 3.1%), and polystyrene (PS, 1.1%). In the study area, the main source of plastic debris was from land-based fishing and tourism activities, and rainwater runoff from the Cauvery River.
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Affiliation(s)
- Kannaiyan Neelavannan
- Institute for Ocean Management, Anna University, Chennai 600025, India; Department of Earth Sciences, Indian Institute of Technology Kanpur, Kanpur 208016, India.
| | - Hema Achyuthan
- Institute for Ocean Management, Anna University, Chennai 600025, India.
| | - Indra Sekhar Sen
- Department of Earth Sciences, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - S Krishnakumar
- Institute for Ocean Management, Anna University, Chennai 600025, India; Department of Geology, Malankara catholic college, Mariyagiri, Kaliyakkavilai, Kanyakumari 629153, India
| | - Kalpana Gopinath
- Institute for Ocean Management, Anna University, Chennai 600025, India; Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå 97754, Sweden
| | - R Dhanalakshmi
- Department of Geography, Queen Mary's College, Chennai 600 004, India
| | - P R Rajalakshmi
- Institute for Ocean Management, Anna University, Chennai 600025, India
| | - Riffin Sajeev
- Institute for Ocean Management, Anna University, Chennai 600025, India
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Elizabeth CV, Amirthalingam S, Krishnakumar S, Anoop PD, Jayakumar R, Paul-Prasanth B. Effects of Whitlockite Nanoparticles on Germ Cell Development and Spermatogenesis in Japanese Medaka. Precision Nanomedicine 2021. [DOI: 10.33218/001c.29807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Gandhi KS, Pradhap D, Prabaharan G, Singh SH, Krishnakumar S. Distribution of plastic litter in beach sediments of Silver beach, Cuddalore, during Nivar Cyclone - A first report. Mar Pollut Bull 2021; 172:112904. [PMID: 34469828 DOI: 10.1016/j.marpolbul.2021.112904] [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: 04/23/2021] [Revised: 08/16/2021] [Accepted: 08/22/2021] [Indexed: 05/24/2023]
Abstract
The present study was conducted to assess the distribution of plastic debris in pre- and post-cyclonic beach sediments in Silver beach, Cuddalore, southeast coast of India. The total amount of macroplastic in pre-cyclonic beach sediments was higher than that in the post-cyclonic coastal sediments (pre-cyclonic 16.1%; post-cyclonic 5.4%). The polymer varieties in pre- and post-cyclonic sediments were present in the following descending order: Pre-cyclonic sediments: polyvinyl chloride (79.06%) > polyethylene (13.9%) > nylon (6.9%); post cyclonic sediments: polypropylene (31.4%) > polyethylene (30.5%) > polystyrene (16.0) > nylon (15.5%) > polyvinyl chloride (5.1%). The different varieties of polymers with irregular shapes in the sediments are most probably introduced into the coastal environment by cyclonic floods. Wind and cyclone-induced rainfall were the driving forces for the transportation and deposition of plastic debris. The results of this study will be useful to formulate effective beach litter management policies in an attempt to develop long-term solutions.
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Affiliation(s)
- K Sanjai Gandhi
- Department of Geology, Periyar University, PG Extension Centre, Dharmapuri 636701, Tamil Nadu, India.
| | - D Pradhap
- Department of Geology, University of Madras, Guindy campus, Chennai 600 025, Tamil Nadu, India
| | - G Prabaharan
- Department of Geology, Periyar University, PG Extension Centre, Dharmapuri 636701, Tamil Nadu, India
| | - Satheesh Herbert Singh
- Department of Geology, Malankara Catholic College, Mariagiri, Kaliakkavilai, Kanyakumari District, Tamil Nadu 629 153, India
| | - S Krishnakumar
- Department of Geology, Malankara Catholic College, Mariagiri, Kaliakkavilai, Kanyakumari District, Tamil Nadu 629 153, India.
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Paul V, Krishnakumar S, Gowd GS, Nair SV, Koyakutty M, Paul-Prasanth B. Sex-Dependent Bioaccumulation of Nano Zinc Oxide and Its Adverse Effects on Sexual Behavior and Reproduction in Japanese Medaka. ACS Appl Bio Mater 2021; 4:7408-7421. [DOI: 10.1021/acsabm.1c00575] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Vinod Paul
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi 682041, India
| | | | | | - Shantikumar V. Nair
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi 682041, India
| | - Manzoor Koyakutty
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi 682041, India
| | - Bindhu Paul-Prasanth
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi 682041, India
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Pradhap D, Gandhi KS, Krishnakumar S, Neelavannan K, Radhakrishnan K, Saravanan P. Baseline distributions and sources of polycyclic aromatic hydrocarbons (PAHs) in reef-associated sediments of Vembar group of Islands, Gulf of Mannar, India. Mar Pollut Bull 2021; 171:112727. [PMID: 34340147 DOI: 10.1016/j.marpolbul.2021.112727] [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: 03/21/2021] [Revised: 07/07/2021] [Accepted: 07/12/2021] [Indexed: 06/13/2023]
Abstract
The study aims to investigate the source and concentration of PAH fractions in the reef sediments of the Vembar group of Islands, Gulf of Mannar, India. The concentration of PAHs ranged from 0.36 to 15.98 ng/g. The reef environment was less contaminated with low-molecular-weight PAH fractions. The accumulation of the LMW-PAH fraction was very less, whereas the HMW fraction was derived from pyrolytic sources. The level of low and high molecular weight PAHs was lower than the level of Effective Range Median (ERM) and Effective Range Low (ERL).The calculated total TEQ value ranged from ND to 10.24 ng/g in the reef sediments.
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Affiliation(s)
- D Pradhap
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - K Sanjai Gandhi
- Department of Geology, Periyar University, PG Extension Centre, Dharmapuri 636701, Tamil Nadu, India
| | - S Krishnakumar
- Department of Geology, Malankara Catholic college, Mariyagiri, Kaliyakkavilai, Kanyakumari District 629153, Tamil Nadu, India.
| | - K Neelavannan
- Institute for Ocean Management, Anna University, Chennai 600025, India; Department of Earth Sciences, Indian Institute of Technology Kanpur, UP 208016, India
| | - K Radhakrishnan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - P Saravanan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
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Vidyasakar A, Krishnakumar S, Kumar KS, Neelavannan K, Anbalagan S, Kasilingam K, Srinivasalu S, Saravanan P, Kamaraj S, Magesh NS. Microplastic contamination in edible sea salt from the largest salt-producing states of India. Mar Pollut Bull 2021; 171:112728. [PMID: 34303058 DOI: 10.1016/j.marpolbul.2021.112728] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [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: 04/13/2021] [Revised: 07/05/2021] [Accepted: 07/12/2021] [Indexed: 06/13/2023]
Abstract
The presence of microplastics in all ecological and environmental conditions has been identified as a global problem. This article aimed to study edible salt-associated microplastics from the major salt-producing states of India. The crystal and powder salt from Tamil Nadu and Gujarat (five samples of powder salt and three samples of crystal salt from each state) were collected and analyzed for their microplastic content. The total microplastic content in the salts ranged from 46 to 115 particles per 200 g in Gujarat salt and 23 to 101 particles per 200 g in Tamil Nadu salt. The microplastics are dominated by red and blue color fibrous-shaped materials. The most common microplastics identified in the edible salts were polyethylene, polyester, and polyvinyl chloride derived from marine and salt-processing units.
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Affiliation(s)
- A Vidyasakar
- Department of Geology, Periyar University PG Extension Centre, Dharmapuri 636701, Tamil Nadu, India
| | - S Krishnakumar
- Department of Geology, Malankara catholic college, Mariyagiri, Kaliyakkavilai, Kanyakumari - 629153.
| | - K Suresh Kumar
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - K Neelavannan
- Institute for Ocean Management, Anna University, Chennai 600025, Tamil Nadu, India
| | - S Anbalagan
- Institute for Ocean Management, Anna University, Chennai 600025, Tamil Nadu, India
| | - K Kasilingam
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - S Srinivasalu
- Institute for Ocean Management, Anna University, Chennai 600025, Tamil Nadu, India
| | - P Saravanan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - S Kamaraj
- Department of Biotechnology, Periyar University PG Extension Centre, Dharmapuri 636701, Tamil Nadu, India
| | - N S Magesh
- National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Headland Sada, Vasco-da-Gama 403804, Goa, India.
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Radhakrishnan K, Sivapriya V, Rajkumar A, Akramkhan N, Prakasheswar P, Krishnakumar S, Hussain SM. Characterization and distribution of microplastics in estuarine surface sediments, Kayamkulam estuary, southwest coast of India. Mar Pollut Bull 2021; 168:112389. [PMID: 33901903 DOI: 10.1016/j.marpolbul.2021.112389] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [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: 06/30/2020] [Revised: 03/25/2021] [Accepted: 04/04/2021] [Indexed: 06/12/2023]
Abstract
The present study aims to formulate the characterization and distribution of microplastic in the estuarine surface sediments of Kayamkulam estuary, southwest coast of India. The sediments were dominated by fibre and film shaped microplastic substances. The surface sediments were dominated by <1000 μm microplastics. The composition of microplastics in descending order was as follows: polyester > polypropylene > polyethylene. The distribution of microplastics was significantly higher than that observed in the other study regions, except for Pearl river estuary and Guanabara Bay. The distribution of microplastics was chiefly controlled by estuarine inundating water and the distance of the sampling site from the open sea.
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Affiliation(s)
- K Radhakrishnan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, India
| | - V Sivapriya
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, India
| | - A Rajkumar
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, India
| | - N Akramkhan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, India
| | - P Prakasheswar
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, India
| | - S Krishnakumar
- Malankara Catholic College, Mariagiri, Kaliakkavilai - 629 153, Kanyakumari District, Tamil Nadu, India.
| | - S M Hussain
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, India
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Trivedi M, Bhende M, Susvar P, Krishnakumar S, Agarwal M. Bilateral hazy vitreous in a patient with convulsions. Indian J Ophthalmol 2021; 68:1736. [PMID: 32823388 PMCID: PMC7690539 DOI: 10.4103/ijo.ijo_369_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Mihir Trivedi
- Shri Bhagwan Mahavir Vitreoretinal Services, Sankara Nethralaya, Medical Research Foundation, Chennai, Tamil Nadu, India
| | - Muna Bhende
- Shri Bhagwan Mahavir Vitreoretinal Services, Sankara Nethralaya, Medical Research Foundation, Chennai, Tamil Nadu, India
| | - Pradeep Susvar
- Shri Bhagwan Mahavir Vitreoretinal Services, Sankara Nethralaya, Medical Research Foundation, Chennai, Tamil Nadu, India
| | - S Krishnakumar
- L&T Ophthalmic Pathology Department, Sankara Nethralaya, Medical Research Foundation, Chennai, Tamil Nadu, India
| | - Mamta Agarwal
- Uveitis Services, Sankara Nethralaya, Medical Research Foundation, Chennai, Tamil Nadu, India
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18
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Deepa PR, Nalini V, Surianarayanan M, Krishnakumar S. Towards safer non-volatile tissue fixatives: Evaluation of choline-based ionic liquids for fixing ocular tissues. Ecotoxicol Environ Saf 2021; 209:111777. [PMID: 33352431 DOI: 10.1016/j.ecoenv.2020.111777] [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: 07/07/2020] [Revised: 11/19/2020] [Accepted: 12/06/2020] [Indexed: 06/12/2023]
Abstract
Volatile organic chemicals (VOCs) are routinely used for processing biological tissue samples in clinical laboratories. Recognizing their serious health and environmental impacts, a few non-volatile green solvents (choline based ionic liquids, ILs) were evaluated as tissue fixatives here. Microscopic evaluation of histo-morphology, fixation and staining quality, and macromolecular integrity (DNA and proteins) were assessed in human eye tissues (sclera, choroid, retinal layers and retinal pigmented epithelium, eyelid and orbit) after IL-fixation. Formalin-fixed tissues were used as standard reference. Microscopic examination revealed favorable histomorphology, tissue fixation and staining characteristics in most tissues immersed in ILs. Time taken to fix, and stability over a period of time (24 h, 48 h, 1 week, 1 month) was also recorded. Electrophoretic analysis revealed stability of cellular proteins and nucleic acids in IL-fixed scleral tissues. Heterogeneity in tissue fixation property relative to the type of ocular tissue, duration of fixation and storage, warrant further design and optimization of ILs to fix biological tissues. The simple cholinium salts based ILs tested here show favorable potential for tissue fixation application, and as an alternative approach to the use of VOCs, towards sustainable biomedical practice.
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Affiliation(s)
- P R Deepa
- Department of Biological Sciences, Birla Institute of Technology & Science (BITS), Pilani 333 031, Rajasthan, India.
| | - V Nalini
- Department of Biological Sciences, Birla Institute of Technology & Science (BITS), Pilani 333 031, Rajasthan, India; L&T Department of Ocular Pathology, Kamalnayan Bajaj Institute for Research in Vision and Ophthalmology, Vision Research Foundation, Sankara Nethralaya, 18, College Road, 600 006 Chennai, India
| | - M Surianarayanan
- Cell for Industrial Safety and Risk Analysis (CISRA), Central Leather Research Institute (CSIR-CLRI), Adyar, Chennai, India
| | - S Krishnakumar
- L&T Department of Ocular Pathology, Kamalnayan Bajaj Institute for Research in Vision and Ophthalmology, Vision Research Foundation, Sankara Nethralaya, 18, College Road, 600 006 Chennai, India.
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Pradhap D, Gandhi KS, Magesh NS, Peter TS, Sadhu C, Silva JD, Godson PS, Krishnakumar S, Saravanan P. Trace element concentrations and their potential ecological risk in the reef sediments of coral islands, Vembar group of islands, Gulf of Mannar, India. Mar Pollut Bull 2020; 160:111607. [PMID: 32898740 DOI: 10.1016/j.marpolbul.2020.111607] [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: 05/21/2020] [Revised: 08/23/2020] [Accepted: 08/24/2020] [Indexed: 06/11/2023]
Abstract
The present work was undertaken to assess the impact of trace element concentration and the status of potential ecological risk in the reef sediments of the Vembar group of islands, Gulf of Mannar Marine National Park, India. Totally, 114 reef sediments (surface) were collected from the Vembar group of islands (Nallathanni Island - 36 samples; Upputhanni Island - 48 samples; Puluvinichalli Island-30 samples). The reef sediments are enriched with sand-sized calcareous particles. The calcium carbonate percentage (CaCO3) was primarily controlled by the distribution of coral colonies and available lithogenic grains. The pollution load index (PLI) reveals that the majority of the sediments fall under the unpolluted category. Moreover, the potential ecological risk (PERI) and sediment pollution index (SPI) reveals that the Vembar group of islands fall under the low ecological risk category.
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Affiliation(s)
- D Pradhap
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - K Sanjai Gandhi
- Department of Geology, PG Extension Centre, Periyar University, Dharmapuri 636701, Tamil Nadu, India
| | - N S Magesh
- National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Headland Sada, Vasco-da-Gama, Goa 403 804, India.
| | - T Simon Peter
- Centre for Geotechnology, Manonmaniam Sundaranar University, Tirunelveli 62701, Tamil Nadu, India
| | - C Sadhu
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - Judith D Silva
- Department of Energy, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - Prince S Godson
- Department of Environmental Sciences, University of Kerala, Thiruvananthapuram 695581, Tamil Nadu, India
| | - S Krishnakumar
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India.
| | - P Saravanan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
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Krishnakumar S, Vidyasakar A, Anbalagan S, Godson PS, Kasilingam K, Parthasarathy P, Pradhap D, Saravanan P, Hariharan S, Rajkumar A, Neelavannan K, Magesh NS. Bioavailable trace metals and their ecological risks in the tourist beaches of the Southeast coast of India. Mar Pollut Bull 2020; 160:111562. [PMID: 32853841 DOI: 10.1016/j.marpolbul.2020.111562] [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: 05/24/2020] [Revised: 07/31/2020] [Accepted: 08/09/2020] [Indexed: 05/12/2023]
Abstract
The concentration of Acid Leachable Trace Metals (ALTMs) was assessed in urbanized tourist beaches (96 samples from Marina beach, 34 samples from Edward Elliot's beach, and 28 samples from Silver beach) of southeast coast of India. The concentration of metals accumulated in the beach sediment was less than the Upper Continental Crust (UCC) background reference values. The mean enrichment of ALTMs in the studied urban tourist beaches showed the following descending order: Marina beach - Cr > Pb > Ni > Zn > Cu > Mn > Co; Edward Elliot's beach - Cr > Pb > Ni > Mn > Co > Zn > Cu; Silver beach - Cr > Pb > Ni > Co > Mn > Cu > Zn. The ALTMs such as Fe, Mn, Co, Cu, and Zn were probably derived from natural weathering and mild anthropogenic influences whereas other metals were derived from anthropogenic induced factors.
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Affiliation(s)
- S Krishnakumar
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, India.
| | - A Vidyasakar
- Department of Geology, Periyar University PG Extension Centre, Dharmapuri 636701, India
| | - S Anbalagan
- Institute for Ocean Management, Anna University, Chennai 600025, India
| | - Prince S Godson
- Department of Environmental Sciences, University of Kerala, Thiruvananthapuram 695581, India
| | - K Kasilingam
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, India
| | - P Parthasarathy
- Department of Geology, A.V.S College of Arts and Science, Salem 636 106, India
| | - D Pradhap
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, India
| | - P Saravanan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, India
| | - S Hariharan
- Department of Geology, Central University of Karnataka, Kadaganchi, Karnataka 585367, India
| | - A Rajkumar
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, India
| | - K Neelavannan
- Institute for Ocean Management, Anna University, Chennai 600025, India
| | - N S Magesh
- National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Headland Sada, Vasco-da-Gama, Goa 403 804, India.
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Sanjai Gandhi K, Pradhap D, Saravanan P, Krishnakumar S, Kasilingam K, Sukanta Patel H, Prakash P, Muthukumaran S, Magesh NS. Metal concentration and its ecological risk assessment in the beach sediments of Coromandel Coast, Southern India. Mar Pollut Bull 2020; 160:111565. [PMID: 32861937 DOI: 10.1016/j.marpolbul.2020.111565] [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: 06/24/2020] [Revised: 07/31/2020] [Accepted: 08/09/2020] [Indexed: 05/12/2023]
Abstract
The present study investigates the concentration of acid leachable trace metals (ALTMs) and their ecological risk in the beach sediments of Coromandel Coast, Southern India. In total, thirty-six beach sediments (eighteen samples from low tide and eighteen samples from high tide) were collected from the study area. The results of the study of the ALTMs suggest that the sediments are enriched by natural processes with significant anthropogenic influences. The distribution of ALTMs in beach sediments is in the following descending order: Fe > Cr > Mn > Pb > Ni > Cu > Co > Zn. The statistical results indicate that the metal concentrations were chiefly originated from natural processes such as leaching, weathering, and fluvial action. In addition, the textural characteristics, organic matter, and calcium carbonate percentage play an important role in the distribution of metals in the beach sediments.
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Affiliation(s)
- K Sanjai Gandhi
- Department of Geology, PG Extension Centre, Periyar University, Dharmapuri 636701, Tamil Nadu, India
| | - D Pradhap
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, Tamil Nadu, India
| | - P Saravanan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, Tamil Nadu, India
| | - S Krishnakumar
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, Tamil Nadu, India.
| | - K Kasilingam
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, Tamil Nadu, India
| | - H Sukanta Patel
- Department of Geology, PG Extension Centre, Periyar University, Dharmapuri 636701, Tamil Nadu, India
| | - P Prakash
- Department of Geology, PG Extension Centre, Periyar University, Dharmapuri 636701, Tamil Nadu, India
| | - S Muthukumaran
- Department of Geology, PG Extension Centre, Periyar University, Dharmapuri 636701, Tamil Nadu, India
| | - N S Magesh
- National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Headland Sada, Vasco-da-Gama, Goa 403 804, India.
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Vidyasakar A, Krishnakumar S, Kasilingam K, Neelavannan K, Bharathi VA, Godson PS, Prabha K, Magesh NS. Characterization and distribution of microplastics and plastic debris along Silver Beach, Southern India. Mar Pollut Bull 2020; 158:111421. [PMID: 32753205 DOI: 10.1016/j.marpolbul.2020.111421] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 06/24/2020] [Accepted: 06/26/2020] [Indexed: 05/18/2023]
Abstract
Microplastics are causing serious environmental threats worldwide. To evaluate the current state of microplastics pollution, 28 sediment samples were examined for microplastics and plastic debris contamination along Silver Beach, Southern India. Visual identification followed by FT-IR spectroscopy was used to estimate the overall distribution and characterization of plastic debris. The results reveal that white-colored (44%) and irregularly-shaped (82%) plastics are prevalent in the study area. Moreover, the dominant polymer in the study area is polyvinyl chloride (79%) followed by polyethylene (14%) and nylon (7%). Based on size fractions, mesoplastics are widely distributed in the beach sediments (65%), followed by microplastics (18%) and macroplastics (17%). The regional sources of plastic debris are tourism and fishing activities followed by storm water runoff through the Gadilam river and wave-induced deposition through high tides. Strict policy measures need to be implemented in recreational beaches like Silver beach to reduce plastic pollution.
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Affiliation(s)
- A Vidyasakar
- Department of Geology, Periyar University PG Extension Centre, Dharmapuri 636701, Tamil Nadu, India
| | - S Krishnakumar
- Department of Geology, University of Madras, Guindy campus, Chennai 600025, Tamil Nadu, India
| | - K Kasilingam
- Department of Geology, University of Madras, Guindy campus, Chennai 600025, Tamil Nadu, India
| | - K Neelavannan
- Department of Geology, University of Madras, Guindy campus, Chennai 600025, Tamil Nadu, India
| | - V Arun Bharathi
- Department of Geology, Periyar University PG Extension Centre, Dharmapuri 636701, Tamil Nadu, India
| | - Prince S Godson
- Department of Environmental Sciences, University of Kerala, Kariavattom campus, Thiruvananthapuram 695581, Kerala, India
| | - K Prabha
- Department of Computer science, Periyar University PG Extension Centre, Dharmapuri 636701,Tamil Nadu, India
| | - N S Magesh
- National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Headland Sada, Vasco-da-Gama 403804, Goa, India.
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Hussain SM, Anbalagan S, Kumar KS, Neelavannan K, Pradhap D, Radhakrishnan K, Godson PS, Krishnakumar S. A baseline study on elemental concentration and potential ecological risk status of the surface sediments of Ashtamudi Lake, south west coast of India. Mar Pollut Bull 2020; 158:111410. [PMID: 32753194 DOI: 10.1016/j.marpolbul.2020.111410] [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: 02/06/2020] [Revised: 06/13/2020] [Accepted: 06/24/2020] [Indexed: 06/11/2023]
Abstract
Element concentration (Fe, Mn, Pb, Zn, Cu, Cr, Ni and Co) in the surface sediments of Ashtamudi estuary, Southwest coast of India, has been analyzed to understand the spatial variation and potential ecological risk status. The sediment pollution index and Potential Ecological Risk index suggest that the northeastern part of the estuary exhibits low to moderate polluted sediments with moderate ecological risk. The results of correlation analysis indicate that the natural weathering process and river input play an important role in the distribution of the elements in the surface sediments of the estuary. The extracted factor results indicate that the fine sediment fractions supporting for accumulation of the trace elements, whereas the enriched level of Fe and Mn is chiefly controlled by the riverine process, and other elements are contributed by anthropogenic influences.
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Affiliation(s)
- S M Hussain
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - S Anbalagan
- Institute for Ocean Management, Anna University, Chennai 600025, Tamil Nadu, India
| | - K Suresh Kumar
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - K Neelavannan
- Institute for Ocean Management, Anna University, Chennai 600025, Tamil Nadu, India
| | - D Pradhap
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - K Radhakrishnan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - Prince S Godson
- Department of Environmental Sciences, University of Kerala, Thiruvananthapuram 695581, Kerala, India
| | - S Krishnakumar
- Institute for Ocean Management, Anna University, Chennai 600025, Tamil Nadu, India.
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Krishnakumar S, Kuris S, Kaveri R, Joshi A, Krishnakumar R. Spontaneous OHSS in a Young Adolescent: A Diagnostic Dilemma. J Obstet Gynaecol India 2020; 70:237-239. [PMID: 32476773 DOI: 10.1007/s13224-019-01256-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 07/12/2019] [Indexed: 12/22/2022] Open
Affiliation(s)
- S Krishnakumar
- JK Women Hospital, Maitri Raghukul, Shahid Bhagat Singh Road, Near PP Chamber, Dombivli East, Dombivli, Maharashtra 421201 India
| | | | - Rachana Kaveri
- JK Women Hospital, Maitri Raghukul, Shahid Bhagat Singh Road, Near PP Chamber, Dombivli East, Dombivli, Maharashtra 421201 India
| | - Aditi Joshi
- JK Women Hospital, Maitri Raghukul, Shahid Bhagat Singh Road, Near PP Chamber, Dombivli East, Dombivli, Maharashtra 421201 India
| | - Rohan Krishnakumar
- JK Women Hospital, Maitri Raghukul, Shahid Bhagat Singh Road, Near PP Chamber, Dombivli East, Dombivli, Maharashtra 421201 India
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Sivaprasad S, Raman R, Conroy D, Mohan, Wittenberg R, Rajalakshmi R, Majeed A, Krishnakumar S, Prevost T, Parameswaran S, Turowski P, Maheswari U, Khobragade R, Netuveli G, Sadanandan R, Greenwood J, Ramasamy K, Rao M, Bergeles C, Das T. The ORNATE India Project: United Kingdom-India Research Collaboration to tackle visual impairment due to diabetic retinopathy. Eye (Lond) 2020; 34:1279-1286. [PMID: 32398841 DOI: 10.1038/s41433-020-0854-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/15/2020] [Accepted: 03/17/2020] [Indexed: 01/02/2023] Open
Abstract
INTRODUCTION The ORNATE India project is funded by the UK Research and Innovation (UKRI) through the Global Challenges Research Fund. The aim is to build research capacity and capability in India and the UK to tackle global burden of diabetes-related visual impairment. As there are over 77 million people with diabetes in India, it is challenging to screen every person with diabetes annually for sight-threatening diabetic retinopathy (DR). Therefore, alternate safe approaches need to be developed so that those at-risk of visual impairment due to DR is identified promptly and treated. METHODS The project team utilised diverse global health strategies and research methods to co-design work packages to build research capacity and capability to ensure effective, affordable and efficient DR services are made available for the population. The strategies and methods employed included health system strengthening; implementation science; establishing care pathways; co-designing collaborative studies on affordable technologies, developing quality standards and guidelines to decrease variations in care; economic analysis; risk modelling and stratification. Five integrated work packages have been developed to deal with all aspects of DR care. These included implementation of a DR screening programme in the public health system in a district in Kerala, evaluating regional prevalence of diabetes and DR and assessing ideal tests for holistic screening for diabetes and its complications in 20 areas in India, utilising artificial intelligence on retinal images to facilitate DR screening, exploring biomarker and biosensor research to detect people at risk of diabetes complications, estimating cost of blindness in India and risk modelling to develop risk-based screening models for diabetes and its complications. A large collaborative network will be formed to propagate research, promote shared learning and bilateral exchanges between high- and middle-income countries to tackle diabetes-related blindness.
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Affiliation(s)
- S Sivaprasad
- NIHR Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust, London, UK.
| | - R Raman
- Vision Research Foundation, Sankara Nethralaya, Chennai, India
| | - D Conroy
- UCL Institute of Ophthalmology, London, UK
| | - Mohan
- Madras Diabetes Research Foundation, Chennai, India
| | | | | | - A Majeed
- Imperial College London, London, UK
| | - S Krishnakumar
- Vision Research Foundation, Sankara Nethralaya, Chennai, India
| | | | - S Parameswaran
- Vision Research Foundation, Sankara Nethralaya, Chennai, India
| | - P Turowski
- UCL Institute of Ophthalmology, London, UK
| | | | | | | | | | | | - K Ramasamy
- Aravind Medical Research Foundation, Madurai, India
| | - M Rao
- Imperial College London, London, UK
| | | | - T Das
- Hyderabad Eye Research Foundation, L V Prasad Eye Institute, Hyderabad, India
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Mukherjee B, Sankadasariya D, Bhadiyadara K, Krishnakumar S. Microphthalmia with pseudogliomatosis proliferation in the retina and orbital cyst. TNOA J Ophthalmic Sci Res 2020. [DOI: 10.4103/tjosr.tjosr_70_19] [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
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Vinothkumar G, Krishnakumar S, Riya, Venkataraman P. Correlation between abnormal GSK3β, β Amyloid, total Tau, p-Tau 181 levels and neuropsychological assessment total scores in CKD patients with cognitive dysfunction: Impact of rHuEPO therapy. J Clin Neurosci 2019; 69:38-42. [DOI: 10.1016/j.jocn.2019.08.073] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 08/06/2019] [Accepted: 08/08/2019] [Indexed: 11/16/2022]
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Sharma P, Krishnakumar S, Chandramouli S, Nashine B, Mani A. Performance evaluation of a low flow rate Annular Linear Induction Pump. ANN NUCL ENERGY 2019. [DOI: 10.1016/j.anucene.2019.04.045] [Citation(s) in RCA: 2] [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: 11/29/2022]
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Krishnakumar S, Geetha B, Premkumar J, Paul Pradeep J. Corrigendum to “Synthesis and characterization of bioscaffolds using freeze drying technique for bone regeneration” [Biocatal. Agric. Biotechnol. 20 (2019) 101184]. Biocatalysis and Agricultural Biotechnology 2019. [DOI: 10.1016/j.bcab.2019.101204] [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]
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Geetha B, Premkumar J, Pradeep JP, Krishnakumar S. Synthesis and characterization of bioscaffolds using freeze drying technique for bone regeneration. Biocatalysis and Agricultural Biotechnology 2019. [DOI: 10.1016/j.bcab.2019.101184] [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: 10/26/2022]
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Krishnakumar S, Paul V, Ariyath A, Anoop PD, Sreekumar S, Menon D, Paul-Prasanth B. Correction to Graphene Quantum Dots Alter Proliferation and Meiosis of Germ Cells Only in Genetic Females of Japanese Medaka during Early Embryonic Development. ACS Appl Bio Mater 2019; 2:2294. [DOI: 10.1021/acsabm.9b00365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sreelakshmi Krishnakumar
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | - Vinod Paul
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | - Ajish Ariyath
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | | | - Sajini Sreekumar
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | - Deepthy Menon
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | - Bindhu Paul-Prasanth
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
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Krishnakumar S, Paul V, Ariyath A, Anoop PD, Sreekumar S, Menon D, Paul-Prasanth B. Graphene Quantum Dots Alter Proliferation and Meiosis of Germ Cells Only in Genetic Females of Japanese Medaka during Early Embryonic Development. ACS Appl Bio Mater 2019; 2:737-746. [DOI: 10.1021/acsabm.8b00606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sreelakshmi Krishnakumar
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | - Vinod Paul
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | - Ajish Ariyath
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | | | - Sajini Sreekumar
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | - Deepthy Menon
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | - Bindhu Paul-Prasanth
- Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
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Ali MS, Anuradha V, Yogananth N, Krishnakumar S. Heart and liver regeneration in zebrafish using silver nanoparticle synthesized from Turbinaria conoides – In vivo. Biocatalysis and Agricultural Biotechnology 2019. [DOI: 10.1016/j.bcab.2018.10.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Vidyasakar A, Neelavannan K, Krishnakumar S, Prabaharan G, Sathiyabama Alias Priyanka T, Magesh NS, Godson PS, Srinivasalu S. Macrodebris and microplastic distribution in the beaches of Rameswaram Coral Island, Gulf of Mannar, Southeast coast of India: A first report. Mar Pollut Bull 2018; 137:610-616. [PMID: 30503475 DOI: 10.1016/j.marpolbul.2018.11.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [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: 06/05/2018] [Revised: 10/26/2018] [Accepted: 11/06/2018] [Indexed: 05/18/2023]
Abstract
This is the first study on the distribution and characteristics of plastic debris found in the sediments of Rameswaram Island, Gulf of Mannar, India. Studies on the distribution of plastics and microplastic content in highly populated coral islands and their impact on the coral ecosystem are very scarce. For this purpose, marine sediment samples were collected from 20 locations along the coastal areas of the study region. The distribution and characterization study was carried out by visual examination followed by FTIR spectroscopy. The results showed abundance of white-colored and irregular-shaped plastic debris in this study area. Polypropylene was identified as a dominant polymer variety, followed by polyethylene, polystyrene, nylon, and polyvinyl chloride. Tourist activities and fishing practices were found to be the possible sources of the microplastic debris. Additionally, the distribution of the plastics was found to be dominantly controlled by the aeolian process and the nature of the coast.
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Affiliation(s)
- A Vidyasakar
- Department of Geology, Periyar University PG Extension Centre, Dharmapuri 636701, India
| | - K Neelavannan
- Department of Geology, University of Madras, Guindy campus, Chennai 600025, India
| | - S Krishnakumar
- Institute for Ocean Management, Anna University, Chennai 600025, India.
| | - G Prabaharan
- Department of Geology, Periyar University PG Extension Centre, Dharmapuri 636701, India
| | | | - N S Magesh
- National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Headland Sada, Vasco-da-Gama, Goa 403804, India
| | - Prince S Godson
- Department of Animal Science, Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu 627012, India
| | - S Srinivasalu
- Institute for Ocean Management, Anna University, Chennai 600025, India
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36
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Agarwal S, Iyer G, Srinivasan B, Benurwar S, Agarwal M, Narayanan N, Lakshmipathy M, Radhika N, Rajagopal R, Krishnakumar S, K LT. Clinical profile, risk factors and outcome of medical, surgical and adjunct interventions in patients with Pythium insidiosum keratitis. Br J Ophthalmol 2018; 103:296-300. [PMID: 30206158 DOI: 10.1136/bjophthalmol-2017-311804] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [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: 12/23/2017] [Revised: 06/05/2018] [Accepted: 08/20/2018] [Indexed: 11/04/2022]
Abstract
PURPOSE To report clinical profile and compare management options for Pythium keratitis. METHOD Retrospective interventional study of 46 patients diagnosed as Pythium keratitis by PCR DNA sequencing from January 2014 to July 2017. Interventions were categorised into medical management (MM) (topical azithromycin and linezolid with oral azithromycin at presentation), surgery (S) (therapeutic penetrating keratoplasty, TPK), surgical adjunct (SA) (cryotherapy±alcohol with TPK) and medical adjunct (MA) (MM after TPK). RESULTS Primary treatment included MM (1 eye), SA (3 eyes) and S (42 eyes). Recurrence occurred in 27/43 eyes (MM+S group). Second surgery (S) was required in 11 eyes (TPK-2), with additional procedures (SA) in 10 eyes and evisceration in five eyes. 8/43 eyes received MA after TPK-1. One eye required TPK-3. Recurrence occured in all eyes that received MA (100%) and in 28 of 54 TPKs (51.8%) (TPK 1+2+3) in 42 eyes. Recurrence was noted in 1/14 (7.1%) that underwent SA. CONCLUSION The currently available and recommended treatment for Pythium keratitis is surgical by means of a TPK and in worse cases evisceration. In our study, MM/MA measures showed no benefit with recurrence or worsening of infection requiring resurgery. Almost 50% of TPKs had a recurrence requiring resurgery. However, adjunctive procedures during TPK appear to have additional benefit with low risk of recurrence and could be included as routine care.
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Affiliation(s)
- Shweta Agarwal
- CJ Shah Cornea Services, Dr G Sitalakshmi Memorial Clinic for Ocular Surface Disorders, Chennai, Tamil Nadu, India
| | - Geetha Iyer
- CJ Shah Cornea Services, Dr G Sitalakshmi Memorial Clinic for Ocular Surface Disorders, Chennai, Tamil Nadu, India
| | - Bhaskar Srinivasan
- CJ Shah Cornea Services, Dr G Sitalakshmi Memorial Clinic for Ocular Surface Disorders, Chennai, Tamil Nadu, India
| | - Saket Benurwar
- CJ Shah Cornea Services, Dr G Sitalakshmi Memorial Clinic for Ocular Surface Disorders, Chennai, Tamil Nadu, India
| | - Mamta Agarwal
- CJ Shah Cornea Services, Dr G Sitalakshmi Memorial Clinic for Ocular Surface Disorders, Chennai, Tamil Nadu, India
| | - Niveditha Narayanan
- CJ Shah Cornea Services, Dr G Sitalakshmi Memorial Clinic for Ocular Surface Disorders, Chennai, Tamil Nadu, India
| | - Meena Lakshmipathy
- CJ Shah Cornea Services, Dr G Sitalakshmi Memorial Clinic for Ocular Surface Disorders, Chennai, Tamil Nadu, India
| | - N Radhika
- CJ Shah Cornea Services, Dr G Sitalakshmi Memorial Clinic for Ocular Surface Disorders, Chennai, Tamil Nadu, India
| | - Rama Rajagopal
- CJ Shah Cornea Services, Dr G Sitalakshmi Memorial Clinic for Ocular Surface Disorders, Chennai, Tamil Nadu, India
| | - S Krishnakumar
- L&T Ophthalmic Pathology Department, Vision Research Foundation, Chennai, Tamil Nadu, India
| | - Lily Therese K
- L&T Microbiology Research Centre, Vision Research Foundation, Chennai, Tamil Nadu, India
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Saravanan P, Krishnakumar S, Pradhap D, Silva JD, Arumugam K, Magesh NS, Srinivasalu S. Elemental concentration based potential ecological risk (PER) status of the surface sediments, Pulicat lagoon, Southeast coast of India. Mar Pollut Bull 2018; 133:107-116. [PMID: 30041297 DOI: 10.1016/j.marpolbul.2018.05.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [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: 03/21/2018] [Revised: 05/08/2018] [Accepted: 05/13/2018] [Indexed: 06/08/2023]
Abstract
Eighty-three surface sediments were collected to investigate the element concentration based sediment pollution and potential ecological risk status of the Pulicat lagoon, southeast coast of India. The textural characteristics, Fe and Mn concentration in the surface sediments are chiefly controlled by the confluence of riverine inputs and vicinity of the marine environment. The varied distribution of CaCO3 concentration is due to the depth of the lagoon followed by the sand and silty sand characteristics of the substratum. The surface sediments are derived from riverine sources. Sediment Pollution Index (SPI), Potential Ecological Risk Index of the sediments suggests that they are falling under less polluted and low potential ecological risk category.
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Affiliation(s)
- P Saravanan
- Department of Geology, University of Madras, Guindy campus, Chennai 600 025, India
| | - S Krishnakumar
- Institute for Ocean Management, Anna University, Chennai 600 025, India.
| | - D Pradhap
- Department of Geology, University of Madras, Guindy campus, Chennai 600 025, India
| | - Judith D Silva
- Department of Energy, University of Madras, Guindy campus, Chennai 600 025, India
| | - K Arumugam
- Institute for Ocean Management, Anna University, Chennai 600 025, India
| | - N S Magesh
- Department of Geology, Anna University, Chennai 600 025, India
| | - S Srinivasalu
- Institute for Ocean Management, Anna University, Chennai 600 025, India
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38
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Saravanan P, Pradhap D, Krishnakumar S, Silva JD, Vidyasakar A, Sackaria M, Godson PS, Arumugam K, Magesh NS. A baseline study on trace element based sediment pollution and potential ecological risk of reef sediments of Musal, Manoli and Manoli putti Islands, Gulf of Mannar, India. Mar Pollut Bull 2018; 133:117-123. [PMID: 30041298 DOI: 10.1016/j.marpolbul.2018.05.024] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 05/07/2018] [Accepted: 05/13/2018] [Indexed: 06/08/2023]
Abstract
The aim of the present study is to assess the baseline level of the trace element, sediment pollution and potential ecological risk of reef associated sediments of Musal, Manoli and Manoli putti Islands, Gulf of Mannar, India. The grain size distribution of the sediments is chiefly controlled by corals and broken shell debris. The distribution of lithoclastic fractions and element concentration are most probably derived from longshore sediment transport and fluvial process from nearby mainland. The enrichment of organic matter is chiefly controlled by mangrove litters and sea grasses. The concentration of lead in the marine sediments is subjected to sediment matrix, vicinity of the local pollutant sources and distance from the mainland coast. The ecological risk assessment clearly reveals that the sediments belong to the low risk category.
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Affiliation(s)
- P Saravanan
- Department of Geology, University of Madras, Guindy campus, Chennai 600 025, India
| | - D Pradhap
- Department of Geology, University of Madras, Guindy campus, Chennai 600 025, India
| | - S Krishnakumar
- Institute for Ocean Management, Anna University, Chennai 600025, India.
| | - Judith D Silva
- Department of Energy, University of Madras, Guindy campus, Chennai 600 025, India
| | - A Vidyasakar
- Department of Geology, Periyar University PG Extension Centre, Dharmapuri 636701, India
| | - Merin Sackaria
- Department of Energy, University of Madras, Guindy campus, Chennai 600 025, India
| | - Prince S Godson
- Department of Environmental Sciences, University of Kerala, Kariavattom campus, Thiruvananthapuram 695581, India.
| | - K Arumugam
- Institute for Ocean Management, Anna University, Chennai 600025, India
| | - N S Magesh
- Department of Geology, Anna University, Chennai 25, India
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Premkumar J, Sudhakar T, Dhakal A, Shrestha JB, Krishnakumar S, Balashanmugam P. Synthesis of silver nanoparticles (AgNPs) from cinnamon against bacterial pathogens. Biocatalysis and Agricultural Biotechnology 2018. [DOI: 10.1016/j.bcab.2018.06.005] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Krishnakumar S, Srinivasalu S, Saravanan P, Vidyasakar A, Magesh NS. A preliminary study on coastal debris in Nallathanni Island, Gulf of Mannar Biosphere Reserve, Southeast coast of India. Mar Pollut Bull 2018; 131:547-551. [PMID: 29886981 DOI: 10.1016/j.marpolbul.2018.04.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [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: 02/08/2018] [Revised: 04/10/2018] [Accepted: 04/11/2018] [Indexed: 05/18/2023]
Abstract
Nine sampling stations were fixed to carry out the preliminary investigation on coastal debris from Nallathanni island, Gulf of Mannar Biosphere Reserve, Southeast coast of India. The coastal debris were separated and identified using hand picking, visual identification and microscopic studies. The coastal areas of the study region were less dominated by micro plastic contamination. The coastal debris was dominated by polyethylene bottles and fibrous fishnet materials. The distribution of the coastal debris along the coastal region is chiefly controlled by winnowing action of sea waves and Aeolian action along the berm region.
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Affiliation(s)
- S Krishnakumar
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, India.
| | - S Srinivasalu
- Institute for Ocean Management, Anna University, Chennai 600025, India
| | - P Saravanan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, India
| | - A Vidyasakar
- Department of Geology, Periyar University PG Extension Centre, Dharmapuri 636701, India
| | - N S Magesh
- Department of Geology, Anna University, Guindy Campus, Chennai 600 025, India
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Saravanan P, Krishnakumar S, Silva JD, Pradhap D, Vidyasakar A, Radhakrishnan K, Godson PS, Arumugam K, Magesh NS. Elemental concentration and potential ecological risk assessment of reef associated surface sediments of Appa Island, Gulf of Mannar Biosphere Reserve, Southeast coast of India. Mar Pollut Bull 2018; 128:398-407. [PMID: 29571389 DOI: 10.1016/j.marpolbul.2018.01.048] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [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: 11/01/2017] [Revised: 01/11/2018] [Accepted: 01/22/2018] [Indexed: 06/08/2023]
Abstract
Thirty three surface sediments were collected for the present study to assess the elemental concentration and its associated ecological risk in the reef associated surface sediments, Appa Island, Gulf of Mannar Biosphere Reserve, South east coast of India. The distribution of calcium carbonate in the reef sediments is controlled by coral debris and shell fragments whereas the Organic matter (OM) content are chiefly derived from mangroves and sea grasses. The circulation of trace elements and Fe, Mn are controlled by the fluvial process and re-suspended sediments. The concentration of Pb was primarily controlled by migration of pollutants through long shore sediment transport process. The main source of Pb in the study area is from coal incinerating power plants and coal handling operations from harbors.
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Affiliation(s)
- P Saravanan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, India
| | - S Krishnakumar
- Institute for Ocean Management, Anna University, Chennai 600025, India.
| | - Judith D Silva
- Department of Energy, University of Madras, Guindy Campus, Chennai 600 025, India
| | - D Pradhap
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, India
| | - A Vidyasakar
- Department of Geology, Periyar University PG Extension Centre, Dharmapuri 636701, India
| | - K Radhakrishnan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600 025, India.
| | - Prince S Godson
- Department of Environmental Sciences, University of Kerala, Kariavattom Campus, Thiruvananthapuram 695581, India
| | - K Arumugam
- Institute for Ocean Management, Anna University, Chennai 600025, India
| | - N S Magesh
- Department of Geology, Anna University, Chennai 600025, India
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Krishnakumar S, Krishnakumar R, Hiwale S. Pregnancy through Assisted Reproductive Technology in a Patient with Thoracic Endometriosis Syndrome. J Hum Reprod Sci 2018; 11:198-201. [PMID: 30158819 PMCID: PMC6094538 DOI: 10.4103/jhrs.jhrs_133_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Extrapelvic endometriosis is known to be difficult to diagnose. Appropriate management in an infertile patient with extrapelvic endometriosis is not only difficult but also not well established. This case report describes a patient with thoracic endometriosis syndrome who was managed successfully for controlling her pleural endometriosis and achieving a pregnancy through assisted reproductive technology (ART).
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Affiliation(s)
- S. Krishnakumar
- Gyneac & IVF, JK Women Hospital, Dombivli, Nirmiti Fertility and IVF Centre, Dombivli, Maharashtra, India,Address for correspondence: Dr. S. Krishnakumar, JK Women Hospital, Maitri Raghukul, Shaheed Bhagat Singh Road, Dombivli (East), Maharashtra, India. E-mail:
| | - Rohan Krishnakumar
- Gyneac & IVF, JK Women Hospital, Dombivli, Nirmiti Fertility and IVF Centre, Dombivli, Maharashtra, India
| | - Sonali Hiwale
- Gyneac & IVF, JK Women Hospital, Dombivli, Nirmiti Fertility and IVF Centre, Dombivli, Maharashtra, India
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Godson PS, Magesh NS, Peter TS, Chandrasekar N, Krishnakumar S, Vincent SGT. A baseline study on the concentration of trace elements in the surface sediments off Southwest coast of Tamil Nadu, India. Mar Pollut Bull 2018; 126:381-388. [PMID: 29421115 DOI: 10.1016/j.marpolbul.2017.11.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 05/11/2017] [Revised: 11/01/2017] [Accepted: 11/13/2017] [Indexed: 06/08/2023]
Abstract
Forty two surface sediment samples were collected in order to document baseline elemental concentration along the Southwest coast of Tamil Nadu, India. The elements detected were Manganese (Mn), Zinc (Zn), Iron (Fe), Copper (Cu), Nickel (Ni) and Lead (Pb). The concentration of Fe and Mn was primarily controlled by the riverine input. The source of Pb and Zn is attributed to leaded petrol and anti-biofouling paints. The calculated index (EF, Igeo and CF) suggests that the sediments of the study area are significantly enriched with all elements except Pb. The contamination factor showed the order of Mn>Zn>Fe>Cu>Ni>Pb. The sediment pollution index (SPI) revealed that the sediments belonged to low polluted to dangerous category. The correlation matrix and dendrogram showed that the elemental distribution was chiefly controlled by riverine input as well as anthropogenic activity in the coast.
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Affiliation(s)
- Prince S Godson
- Department of Environmental Sciences, University of Kerala, Karyavattom campus, Thiruvananthapuram 695581.
| | - N S Magesh
- Department of Geology, Anna University, Chennai 600025
| | - T Simon Peter
- Centre for GeoTechnology, Manonmaniam Sundaranar University, Tirunelveli 627012
| | - N Chandrasekar
- Centre for GeoTechnology, Manonmaniam Sundaranar University, Tirunelveli 627012
| | - S Krishnakumar
- Institute for Ocean Management, Anna University, Guindy campus, Chennai 600025
| | - Salom Gnana Thanga Vincent
- Department of Environmental Sciences, University of Kerala, Karyavattom campus, Thiruvananthapuram 695581.
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Alam MS, Mukherjee B, Krishnakumar S, Biswas J. Malignant perivascular epithelioid cell tumor of the orbit: Report of a case and review of literature. Indian J Ophthalmol 2017; 65:889-891. [PMID: 28905842 PMCID: PMC5621281 DOI: 10.4103/ijo.ijo_331_17] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Perivascular epithelioid cell tumor (PEComa) is a rare neoplasm considered to arise from myomelanocytic cell lineage. The uterus is reportedly the most common site to be involved. Orbital PEComa is extremely rare with only two cases reported till date. A 5-year-old male presented with a right medial orbital mass for the last 6 months. The patient was diagnosed with alveolar soft part sarcoma elsewhere. Magnetic resonance imaging features were suggestive of lymphangioma with bleeding. The excision biopsy revealed multiple tumor cells comprising epithelioid cells with clear cytoplasm, along with nuclear atypia and mitosis. Immunohistochemistry was positive for HMB-45, smooth muscle actin, vimentin, and CD-34. It was negative for cytokeratin, S-100, and synaptophysin, which clinched the diagnosis of malignant orbital PEComa. Neoadjuvant chemotherapy was administered. There was no recurrence at 24 months of follow-up. At present, there is no consensus on management protocol for malignant PEComa. Complete surgical excision with chemotherapy appears to offer the best prognosis.
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Affiliation(s)
- Md Shahid Alam
- Department of Orbit, Oculoplasty, Reconstructive and Aesthetic Services, Sankara Nethralaya, Medical Research Foundation, Chennai, Tamil Nadu, India
| | - Bipasha Mukherjee
- Department of Orbit, Oculoplasty, Reconstructive and Aesthetic Services, Sankara Nethralaya, Medical Research Foundation, Chennai, Tamil Nadu, India
| | - S Krishnakumar
- Department of Ocular Pathology, Sankara Nethralaya, Medical Research Foundation, Chennai, Tamil Nadu, India
| | - Jyotirmay Biswas
- Department of Ocular Pathology, Sankara Nethralaya, Medical Research Foundation, Chennai, Tamil Nadu, India
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45
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Krishnakumar S, Ramasamy S, Simon Peter T, Godson PS, Chandrasekar N, Magesh NS. Geospatial risk assessment and trace element concentration in reef associated sediments, northern part of Gulf of Mannar biosphere reserve, Southeast Coast of India. Mar Pollut Bull 2017; 125:522-529. [PMID: 28838599 DOI: 10.1016/j.marpolbul.2017.08.042] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [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: 04/19/2017] [Revised: 08/11/2017] [Accepted: 08/17/2017] [Indexed: 06/07/2023]
Abstract
Fifty two surface sediments were collected from the northern part of the Gulf of Mannar biosphere reserve to assess the geospatial risk of sediments. We found that distribution of organic matter and CaCO3 distributions were locally controlled by the mangrove litters and fragmented coral debris. In addition, Fe and Mn concentrations in the marine sediments were probably supplied through the riverine input and natural processes. The Geo-accumulation of elements fall under the uncontaminated category except Pb. Lead show a wide range of contamination from uncontaminated-moderately contaminated to extremely contaminated category. The sediment toxicity level of the elements revealed that the majority of the sediments fall under moderately to highly polluted sediments (23.07-28.84%). The grades of potential ecological risk suggest that predominant sediments fall under low to moderate risk category (55.7-32.7%). The accumulation level of trace elements clearly suggests that the coral reef ecosystem is under low to moderate risk.
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Affiliation(s)
- S Krishnakumar
- Department of Geology, University of Madras, Guindy campus, Chennai 600025, India.
| | - S Ramasamy
- Department of Geology, University of Madras, Guindy campus, Chennai 600025, India
| | - T Simon Peter
- Centre for GeoTechnology, Manonmaniam Sundaranar University, Tirunelveli 62701, India
| | - Prince S Godson
- Department of Environmental Sciences, University of Kerala, Kariavattom campus, Thiruvananthapuram 695581, India
| | - N Chandrasekar
- Centre for GeoTechnology, Manonmaniam Sundaranar University, Tirunelveli 627012, India
| | - N S Magesh
- Department of Geology, Anna University, Chennai 600025, India
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Saravanan P, Krishnakumar S, Parthasarathy P, Silva JD, Pradhap D. Sediment textural characteristics and elemental distribution in the core sediments, Pullivasal and Kurusadai Island, Gulf of Mannar, Southeast coast of India. Data Brief 2017; 15:439-444. [PMID: 29062867 PMCID: PMC5645517 DOI: 10.1016/j.dib.2017.09.070] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 09/13/2017] [Accepted: 09/26/2017] [Indexed: 12/04/2022] Open
Abstract
Two core samples were collected in order to assess the textual characteristics and elemental distribution of the sediments, from the lagoonal environment of Pullivasal and Kurusadai island, Gulf of Mannar, Southeast coast of India. The distribution of the organic matter and calcium carbonate is chiefly controlled by the coral debris, shell fragments and mangrove litters. The elemental distribution is controlled by natural process and other trace elements are controlled by anthropogenic land based activities.
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Affiliation(s)
- P Saravanan
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, India
| | - S Krishnakumar
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, India
| | - P Parthasarathy
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, India
| | - Judith D Silva
- Department of Energy, University of Madras, Guindy Campus, Chennai 600025, India
| | - D Pradhap
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, India
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Abstract
Mesenchymal chondrosarcoma is a rare orbital tumor. Several case reports of this rare tumor have been published in the literature but only 6 cases have documented a follow up of 5 years or more. We report a case of 28 year-old female who presented with left orbital mass. Computed Tomography (CT) revealed a lobulated mass in the superior extraconal space with dense intralesional calcification. Patient underwent complete resection of the mass and histopathology was suggestive of mesenchymal chondrosarcoma. He was given adjuvant radiotherapy and there was no recurrence or metastasis at 5 years of follow-up. The case highlights that a complete resection with adjuvant radiotherapy in cases of orbital mesenchymal chondrosarcoma offers excellent prognosis.
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Affiliation(s)
- Md Shahid Alam
- a Orbit, Oculoplasty, Reconstructive & Aesthetic Services , Sankara Nethralaya, Medical Research Foundation , Chennai , India
| | - Nirmala Subramanian
- a Orbit, Oculoplasty, Reconstructive & Aesthetic Services , Sankara Nethralaya, Medical Research Foundation , Chennai , India
| | - Akruti Sunil Desai
- b Department of Orbit and Oculoplasty , Dr. Agarwals Eye Hospital , Chennai, India
| | - S Krishnakumar
- c Department of Ocular Pathology , Sankara Nethralaya, Medical Research Foundation , Chennai , India
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Magesh NS, Chandrasekar N, Krishnakumar S. Geospatial analysis of dissolved nutrients dataset in the surface water of Karayar reservoir, Southern India. Data Brief 2017; 13:575-581. [PMID: 28706967 PMCID: PMC5496461 DOI: 10.1016/j.dib.2017.06.037] [Citation(s) in RCA: 2] [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: 04/25/2017] [Revised: 05/30/2017] [Accepted: 06/21/2017] [Indexed: 12/03/2022] Open
Abstract
Spatial dataset representing the nutrient distribution in Karayar reservoir during pre and post-monsoon season is presented. Random sampling method was used for data collection and the sample location were fixed using a handheld global positioning system (Garmin GPSMAP-76). The nutrients were estimated using the standard techniques as described in the American Public Health Association (APHA) manual. Physical parameters were estimated using a Hanna portable multi water quality probe (HI-9828, USA). The spatial distribution of physical and nutrient content in surface water is carried out using an inverse distance weighted technique.
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Affiliation(s)
- N S Magesh
- Centre for Geotechnology, Manonmaniam Sundaranar University, Tirunelveli 627012, Tamil Nadu, India
| | - N Chandrasekar
- Centre for Geotechnology, Manonmaniam Sundaranar University, Tirunelveli 627012, Tamil Nadu, India
| | - S Krishnakumar
- Department of Geology, University of Madras, Guindy Campus, Chennai 600025, Tamil Nadu, India
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Vinothkumar G, Kedharnath C, Krishnakumar S, Sreedhar S, Preethikrishnan K, Dinesh S, Sundaram A, Balakrishnan D, Shivashekar G, Sureshkumar, Venkataraman P. Abnormal amyloid β 42 expression and increased oxidative stress in plasma of CKD patients with cognitive dysfunction: A small scale case control study comparison with Alzheimer's disease. BBA Clin 2017; 8:20-27. [PMID: 28702365 PMCID: PMC5491400 DOI: 10.1016/j.bbacli.2017.06.001] [Citation(s) in RCA: 8] [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: 02/21/2017] [Revised: 06/02/2017] [Accepted: 06/20/2017] [Indexed: 01/31/2023]
Abstract
Background Cognitive dysfunction has been increasingly recognized in chronic kidney disease (CKD) patients. Senile plaques are important pathophysiological characteristic of cognitive dysfunction. The major component of plaques is the amyloid β (Aβ) peptide released from proteolytic cleavage of amyloid precursor protein (APP). Plasma Aβ has been a focus of the growing literature on blood based biomarkers for cognitive dysfunction. Oxidative stress is prevalent in CKD and it plays an important role in cognitive dysfunction. Increased oxidative stress leads to cause cleavage of APP and Aβ production. The aim of this study is to assess the antioxidant status and Aβ42 levels in plasma of CKD patients with cognitive dysfunction compared to CKD without cognitive dysfunction. Methods A total of 60 subjects divided into 30 CKD without cognitive dysfunction and 30 CKD with cognitive dysfunction based on neuropsychological assessment tests. To compare antioxidant status and Aβ42 levels in plasma, the following groups such as healthy subjects (n = 30), normocytic normochromic anemia (n = 30) and Alzheimer's disease (AD, n = 10) patients were also maintained. Plasma Superoxide dismutase (SOD), Catalase (CAT), Glutathione peroxidase (GPx), Reduced glutathione (GSH) and lipid peroxidation (LPO) were determined by spectrophotometrically. Aβ level was determined by immunoblotting method. The parameters were statistically compared with healthy, normocytic normochromic anemia and AD subjects. Results Like AD subjects, significantly increased Aβ and LPO level while decreased SOD, CAT, GPx and GSH levels were observed in plasma of CKD patients with cognitive dysfunction when compared to healthy, CKD without cognitive dysfunction and normocytic normochromic anemic subjects. Conclusion Results suggest that elevated plasma oxidative stress and Aβ were seen in CKD patients with cognitive dysfunction may be attributed to pathological changes within the brain. Cognitive dysfunction has been increasingly recognized in chronic kidney disease (CKD) patients. The major component of plaques is the amyloid β peptide released from proteolytic cleavage of amyloid precursor protein. Plasma Aβ has been a focus of the growing literature on blood based biomarkers for cognitive dysfunction. Oxidative stress is prevalent in CKD and it plays an important role in cognitive dysfunction. Increased oxidative stress leads to cause cleavage of APP and Aβ production.
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Affiliation(s)
- G Vinothkumar
- Department of Medical Research, SRM Medical College Hospital, SRM University, Chennai, India
| | - C Kedharnath
- Department of Nephrology, SRM Medical College Hospital, SRM University, Chennai, India
| | - S Krishnakumar
- Department of Nephrology, SRM Medical College Hospital, SRM University, Chennai, India
| | - S Sreedhar
- Department of Nephrology, SRM Medical College Hospital, SRM University, Chennai, India
| | - K Preethikrishnan
- Department of Clinical Psychology, SRM Medical College Hospital, SRM University, Chennai, India
| | - S Dinesh
- Department of Clinical Psychology, SRM Medical College Hospital, SRM University, Chennai, India
| | - A Sundaram
- Department of Medical Research, SRM Medical College Hospital, SRM University, Chennai, India
| | - D Balakrishnan
- Department of Medical Research, SRM Medical College Hospital, SRM University, Chennai, India
| | - G Shivashekar
- Department of Pathology, SRM Medical College Hospital, SRM University, Chennai, India
| | - Sureshkumar
- Department of Neurology, Balaji Medical College Hospital, Chrompet, Chennai, India
| | - P Venkataraman
- Department of Medical Research, SRM Medical College Hospital, SRM University, Chennai, India
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Simon Peter T, Chandrasekar N, John Wilson JS, Selvakumar S, Krishnakumar S, Magesh NS. A baseline record of trace elements concentration along the beach placer mining areas of Kanyakumari coast, South India. Mar Pollut Bull 2017; 119:416-422. [PMID: 28343631 DOI: 10.1016/j.marpolbul.2017.03.040] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 03/16/2017] [Accepted: 03/18/2017] [Indexed: 05/12/2023]
Abstract
Trace element concentration in the beach placer mining areas of Kanyakumari coast, South India was assessed. Sewage and contaminated sediments from mining sites has contaminated the surface sediments. Enrichment factor indicates moderately severe enrichment for Pb, minor enrichment for Mn, Zn, Ni, Fe and no enrichment for Cr and Cu. The Igeo values show higher concentration of Pb ranging in the scale of 3-4, which shows strong contamination due to high anthropogenic activity such as mining and terrestrial influences into the coastal regions. Correlation coefficient shows that most of the elements are associated with each other except Ni and Pb. Factor analysis reveals that Mn, Zn, Fe, Cr, Pb and Cu are having a significant loading and it indicates that these elements are mainly derived from similar origin. The cluster analysis clearly indicated that the mining areas are grouped under cluster 2 and non-mining areas are clustered under group 1.
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Affiliation(s)
- T Simon Peter
- Centre for Geotechnology, Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu 627 012, India.
| | - N Chandrasekar
- Centre for Geotechnology, Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu 627 012, India
| | - J S John Wilson
- Centre for Geotechnology, Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu 627 012, India
| | - S Selvakumar
- Centre for Geotechnology, Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu 627 012, India
| | - S Krishnakumar
- Department of Geology, University of Madras, Guindy campus, Chennai, Tamil Nadu 600 025, India
| | - N S Magesh
- Centre for Geotechnology, Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu 627 012, India
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