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Wang SS, Hall ML, Lee E, Kim SC, Ramesh N, Lee SH, Jang JY, Bold RJ, Ku JL, Hwang CI. Whole-genome bisulfite sequencing identifies stage- and subtype-specific DNA methylation signatures in pancreatic cancer. iScience 2024; 27:109414. [PMID: 38532888 PMCID: PMC10963232 DOI: 10.1016/j.isci.2024.109414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 02/03/2024] [Accepted: 02/29/2024] [Indexed: 03/28/2024] Open
Abstract
In pancreatic ductal adenocarcinoma (PDAC), no recurrent metastasis-specific mutation has been found, suggesting that epigenetic mechanisms, such as DNA methylation, are the major contributors of late-stage disease progression. Here, we performed the first whole-genome bisulfite sequencing (WGBS) on mouse and human PDAC organoid models to identify stage-specific and molecular subtype-specific DNA methylation signatures. With this approach, we identified thousands of differentially methylated regions (DMRs) that can distinguish between the stages and molecular subtypes of PDAC. Stage-specific DMRs are associated with genes related to nervous system development and cell-cell adhesions, and are enriched in promoters and bivalent enhancers. Subtype-specific DMRs showed hypermethylation of GATA6 foregut endoderm transcriptional networks in the squamous subtype and hypermethylation of EMT transcriptional networks in the progenitor subtype. These results indicate that aberrant DNA methylation contributes to both PDAC progression and subtype differentiation, resulting in significant and reoccurring DNA methylation patterns with diagnostic and prognostic potential.
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Affiliation(s)
- Sarah S. Wang
- Department of Microbiology and Molecular Genetics, College of Biological Sciences, University of California Davis, Davis, CA 95616, USA
| | - Madison L. Hall
- Department of Microbiology and Molecular Genetics, College of Biological Sciences, University of California Davis, Davis, CA 95616, USA
| | - EunJung Lee
- Department of Microbiology and Molecular Genetics, College of Biological Sciences, University of California Davis, Davis, CA 95616, USA
| | - Soon-Chan Kim
- Department of Biomedical Sciences, Korean Cell Line Bank, Laboratory of Cell Biology and Cancer Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - Neha Ramesh
- Department of Microbiology and Molecular Genetics, College of Biological Sciences, University of California Davis, Davis, CA 95616, USA
| | - Sang Hyub Lee
- Department of Internal Medicine and Liver Research Institute, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - Jin-Young Jang
- Department of Surgery and Cancer Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - Richard J. Bold
- Division of Surgical Oncology, Department of Surgery, University of California, Davis, Sacramento, CA, USA
- University of California Davis Comprehensive Cancer Center, Sacramento, CA, USA
| | - Ja-Lok Ku
- Department of Biomedical Sciences, Korean Cell Line Bank, Laboratory of Cell Biology and Cancer Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - Chang-Il Hwang
- Department of Microbiology and Molecular Genetics, College of Biological Sciences, University of California Davis, Davis, CA 95616, USA
- University of California Davis Comprehensive Cancer Center, Sacramento, CA, USA
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2
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Manisha M, Verma K, Ramesh N, Anirudha TP, Santrupt RM, Rao L. Water, sanitation, and hygiene implications of large-scale recycling of treated municipal wastewater in semi-arid regions. Sci Total Environ 2023; 904:166631. [PMID: 37659564 DOI: 10.1016/j.scitotenv.2023.166631] [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: 05/03/2023] [Revised: 08/23/2023] [Accepted: 08/25/2023] [Indexed: 09/04/2023]
Abstract
Access to water, sanitation, and hygiene (WaSH) is crucial for national development, as it improves human health and fulfills a fundamental need. This study examines the impact of a large-scale groundwater (GW) recharge scheme using secondary treated wastewater (STW) on WaSH characteristics and identifies the major determinants of improved WaSH charecteristics in drought-hit regions of Kolar district, southern India. The study quantifies improved WaSH practices by comparing WaSH characteristics between impacted areas (influenced by STW) and non-impacted areas (not influenced by STW) of Kolar, using household survey data. Pearson's chi-square and student's t-test are used to verify differences between WaSH characteristics. Furthermore, a composite WaSH score is formulated, and a hierarchical stepwise multiple linear regression model is constructed to identify major determinants of improved WaSH scores. The results show that impacted areas have better WaSH characteristics, including daily water supply by gram panchayat, enhanced toilet uses among all family members, bathing patterns, cloth washing practices, toilet cleaning patterns, and water consumption per capita per day. The maximum and minimum WaSH scores of impacted areas were 17.50 and 6.50, respectively, while those of non-impacted areas were 14 and 4.5. This study finds that improved water availability, quality, and security due to daily water supply at the household level are the major determinants of improved WaSH practices. These results can inform policymakers in designing sanitation and hygiene improvement policies that integrate water recycling projects in drought-hit areas.
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Affiliation(s)
- Manjari Manisha
- Centre for Sustainable Technologies, Indian Institute of Science, Bengaluru, India.
| | - Kavita Verma
- Centre for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - N Ramesh
- Centre for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - T P Anirudha
- Centre for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - R M Santrupt
- Centre for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - Lakshminarayana Rao
- Centre for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
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3
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Verma K, Manisha M, Shivali NU, Santrupt RM, Anirudha TP, Ramesh N, Chanakya HN, Parama VRR, Mohan Kumar MS, Rao L. Investigating the effects of irrigation with indirectly recharged groundwater using recycled water on soil and crops in semi-arid areas. Environ Pollut 2023; 337:122516. [PMID: 37690469 DOI: 10.1016/j.envpol.2023.122516] [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: 06/12/2023] [Revised: 08/18/2023] [Accepted: 09/04/2023] [Indexed: 09/12/2023]
Abstract
The utilization of direct wastewater for irrigation poses many environmental problems such as soil quality deterioration due to the accumulation of salts, heavy metals, micro-pollutants, and health risks due to undesirable microorganisms. This hampers its agricultural reuse in arid and semi-arid regions. To address these concerns, the present study introduces a recent approach that involves using indirectly recharged groundwater (GW) with secondary treated municipal wastewater (STW) for irrigation through a Soil Aquifer Treatment-based system (SAT). This method aims to mitigate freshwater scarcity in semi-arid regions. The study assessed GW levels, physicochemical properties, and microbial diversity of GW, and soil in both impacted (receiving recycled water) and non-impacted (not receiving recycled water) areas, before recycling (2015-2018) and after recycling (2019-2022) period of the project. The results indicated a significant increase of 68-70% in GW levels of the studied boreholes in the impacted areas. Additionally, the quality of indirectly recharged GW in the impacted areas improved notably in terms of electrical conductivity (EC), hardness, total dissolved solids (TDS), sodium adsorption ratio (SAR), along with certain cations and anions (hard water to soft water). No significant difference was observed in soil properties and microbial diversity of the impacted areas, except for EC and SAR, which were reduced by 50% and 39%, respectively, after the project commenced. The study also monitored specific microbial species, including total coliforms, Escherichia coli (as indicator organisms), Shigella, and Klebsiella in some of the harvested crops (beetroot, tomato, and spinach). However, none of the analysed crops exhibited the presence of the studied microorganisms. Overall, the study concludes that indirectly recharged GW using STW is a better sustainable and safe irrigation alternative compared to direct wastewater use or extracted hard GW from deep aquifers.
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Affiliation(s)
- Kavita Verma
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India.
| | - Manjari Manisha
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - N U Shivali
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - R M Santrupt
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - T P Anirudha
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - N Ramesh
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - H N Chanakya
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - V R R Parama
- Department of Soil Science & Agricultural Chemistry, College of Agriculture, UAS, GKVK, Bengaluru, India
| | - M S Mohan Kumar
- Formerly @ Department of Civil Engineering, Indian Institute of Science, Bengaluru, India; Currently @ Gitam University, Bengaluru, India
| | - Lakshminarayana Rao
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
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4
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Verma K, Manisha M, Santrupt RM, Anirudha TP, Goswami S, Sekhar M, Ramesh N, M S MK, Chanakya HN, Rao L. Assessing groundwater recharge rates, water quality changes, and agricultural impacts of large-scale water recycling. Sci Total Environ 2023; 877:162869. [PMID: 36933723 DOI: 10.1016/j.scitotenv.2023.162869] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Revised: 03/05/2023] [Accepted: 03/10/2023] [Indexed: 05/06/2023]
Abstract
The over-exploitation and insufficient replenishment of groundwater (GW) have resulted in a pressing need to conserve freshwater and reuse of treated wastewater. To address this issue, the Government of Karnataka launched a large-scale recycling (440 million liters/day) scheme to indirectly recharge GW using secondary treated municipal wastewater (STW) in drought-prone areas of Kolar district in southern India. This recycling employs soil aquifer treatment (SAT) technology, which involves filling surface run-off tanks with STW that intentionally infiltrate and recharge aquifers. This study quantifies the impact of STW recycling on GW recharge rates, levels, and quality in the crystalline aquifers of peninsular India. The study area is characterized by hard rock aquifers with fractured gneiss, granites, schists, and highly fractured weathered rocks. The agricultural impacts of the improved GW table are also quantified by comparing areas receiving STW to those not receiving it, and changes before and after STW recycling were measured. The AMBHAS_1D model was used to estimate the recharge rates and showed a tenfold increase in daily recharge rates, resulting in a significant increase in the GW levels. The results indicate that the surface water in the rejuvenated tanks meets the country's stringent water discharge standards for STW. The GW levels of the studied boreholes increased by 58-73 %, and the GW quality improved significantly, turning hard water into soft water. Land use land cover studies confirmed an increase in the number of water bodies, trees, and cultivated land. The availability of GW significantly improved agricultural productivity (11-42 %), milk productivity (33 %), and fish productivity (341 %). The study's outcomes are expected to serve as a role model for the rest of Indian metro cities and demonstrate the potential of reusing STW to achieve a circular economy and a water-resilient system.
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Affiliation(s)
- Kavita Verma
- Center for Sustainable Technologies, Indian Institute of Science, Bangalore, India.
| | - Manjari Manisha
- Center for Sustainable Technologies, Indian Institute of Science, Bangalore, India
| | - R M Santrupt
- Center for Sustainable Technologies, Indian Institute of Science, Bangalore, India
| | - T P Anirudha
- Center for Sustainable Technologies, Indian Institute of Science, Bangalore, India
| | - Shubham Goswami
- Department of Civil Engineering, Indian Institute of Science, Bangalore, India
| | - M Sekhar
- Department of Civil Engineering, Indian Institute of Science, Bangalore, India
| | - N Ramesh
- Center for Sustainable Technologies, Indian Institute of Science, Bangalore, India
| | - Mohan Kumar M S
- Department of Civil Engineering, Indian Institute of Science, Bangalore, India
| | - H N Chanakya
- Center for Sustainable Technologies, Indian Institute of Science, Bangalore, India
| | - Lakshminarayana Rao
- Center for Sustainable Technologies, Indian Institute of Science, Bangalore, India; Interdisciplinary Centre for Water Research, Indian Institute of Science, Bangalore, India
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5
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Manisha M, Verma K, Ramesh N, Anirudha TP, Santrupt RM, Das R, Mohan Kumar MS, Chanakya HN, Rao L. Socio-economic impact assessment of large-scale recycling of treated municipal wastewater for indirect groundwater recharge. Sci Total Environ 2023; 859:160207. [PMID: 36402318 DOI: 10.1016/j.scitotenv.2022.160207] [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: 08/18/2022] [Revised: 10/21/2022] [Accepted: 11/11/2022] [Indexed: 06/16/2023]
Abstract
Reusing treated wastewater is an emerging solution to address freshwater scarcity, and surface water contamination faced worldwide. A unique large-scale wastewater recycling project was implemented to replenish groundwater by filling secondary treated wastewater (STW) into existing irrigation tanks in severely drought-hit areas of the Kolar districts of Southern India. This study quantifies the socio-economic impacts of this large-scale indirect groundwater recharge scheme. The changes in areas receiving STW i.e., impacted areas and those areas which did not receive STW i.e., non-impacted areas was studied. Also, pre and post recycling changes were quantified in the Kolar district. The results show that surface water quality meets India's most stringent treated wastewater discharge standards prescribed by the Hon'ble National Green Tribunal. Due to these recycling efforts, significant improvements in groundwater level and quality were found. It was observed that there was a noticeable difference in agricultural cropping areas, seasons, patterns, and production between impacted and non-impacted areas. Post-recycling, farmers tended to cultivate cash and water-intensive crops over less water-intensive crops. During the post-recycling period, livestock and milk production also increased, and in impacted areas, it was significantly higher. Post-recycling, fish production increased and land prices per hectare increased by 118 % in impacted areas. The farmer's net income under flowers and vegetable farming increased by 202 % and 150 % respectively in impacted areas compared to non-impacted areas. Furthermore, this project contributes to a circular economy transition in the water sector, which has economic, environmental, social, and cultural benefits. A key recommendation from the outcomes of the study is to draft and implement a policy that encourages the reuse of recycled water for groundwater recharge which in turn will improve the agro-economic system and food security.
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Affiliation(s)
- Manjari Manisha
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India.
| | - Kavita Verma
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - N Ramesh
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - T P Anirudha
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - R M Santrupt
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - Reshmi Das
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - M S Mohan Kumar
- Department of Civil Engineering, Indian Institute of Science, Bengaluru, India; Gitam University, India
| | - H N Chanakya
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
| | - Lakshminarayana Rao
- Center for Sustainable Technologies, Indian Institute of Science, Bengaluru, India
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6
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Mahalakshmi R, Ramesh N. Occurrence and distribution of heavy metals in water and soil sediments of Vellore District, Tamil Nadu, India. Environ Monit Assess 2022; 194:892. [PMID: 36242676 DOI: 10.1007/s10661-022-10527-5] [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: 01/28/2022] [Accepted: 03/28/2022] [Indexed: 06/16/2023]
Abstract
The occurrence of heavy metals (HMs) in water and soil sediments represents a serious environmental concern. This study revealed the presence and distribution of HMs in water and soil sediments of various places in Vellore District, Tamil Nadu, India. Twenty-one sites were selected along the study area, and inductively coupled plasma-optical emission spectrometry (ICP-OES) was used to analyze the concentration of the heavy metals. The dominance of various HMs in the soil sediment sample follows the order strontium (Sr) > Manganese (Mn) > Barium (Ba) > Zinc (Zn) > Nickel (Ni) and Sr > Mn > Zn > Boron (B) > , respectively. It was found that the concentration of HMs in water and soil sediments in Ambur market and Mottukollai area was significantly higher than the recommended limits. Thus, the results showed that the presence of HMs in water and soil sediments could be threatened pollution factors unsafe for irrigation, drinking, and other human activities.
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Affiliation(s)
- R Mahalakshmi
- School of Bio-Sciences and Technology, Vellore Institute of Technology, Tamil Nadu, Vellore, 632014, India
| | - N Ramesh
- School of Bio-Sciences and Technology, Vellore Institute of Technology, Tamil Nadu, Vellore, 632014, India.
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7
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Colaco S, Ramesh N, Shabaraya R. Demonstration of relative bioavailability of newly developed and innovator drug metaxalone 800 mg in healthy subjects under fed condition. J Adv Pharm Technol Res 2022; 13:123-127. [PMID: 35464658 PMCID: PMC9022370 DOI: 10.4103/japtr.japtr_362_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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Accepted: 02/11/2022] [Indexed: 11/04/2022] Open
Abstract
The notable unbiased of this research work was to evaluate the well-being and effectiveness of metaxalone by administering the newly developed test and reference drug. A two-period, two-categorization, crossover bioavailability study in fed conditions. Eleven participants were dosed and completed the trial successfully. The drugs were administered by way of a schedule. Samples collected in both periods for pharmacokinetic evaluation. Plasma samples analyzed using a validated method. Pharmacokinetic parameters for investigational and reference products were calculated using the metaxalone drug concentration and safety of the participants monitored by measurement of vital sign. Relative estimation factors calculated for Cmax, Tmax, area under the curve (AUC) t, AUC inf, K el, half-life, and 90% confidence intervals applied for to check for whether reference and test products are equivalent. The experimental part of the study was completed with no major adversarial event. No losses or stern adverse events transpired throughout the course of the experiment. The assessment product is analogous to reference product in relation to degree and extent of absorption. The outcome of this study indicates the newly developed drug is equivalent to the innovator drug and medication was well tolerated by all participants.
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Affiliation(s)
- Socorrina Colaco
- Department of Pharmacology, GITAM Institute of Medical Sciences and Research, GITAM, Rushikonda, Visakhapatnam, India
| | - N Ramesh
- Department of Pharmaceutics, Srinivas College of Pharmacy, Farengipete Post, Mangalore, Karnataka, India
| | - Ramakrishna Shabaraya
- Department of Pharmaceutics, Srinivas College of Pharmacy, Farengipete Post, Mangalore, Karnataka, India
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8
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Arshad S, Brar G, Xu S, Ramesh N, Talajia K, Anwar M, ter Wal A. 222 Robotic Surgery: Public Perceptions and Current Misconceptions. Br J Surg 2022. [DOI: 10.1093/bjs/znac040.020] [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: 11/13/2022]
Abstract
Abstract
Aim
While surgeons and robotic companies are key stakeholders involved in the adoption of Robotic Surgery (RS), the public's role is often overlooked. However, given that patients hold ultimate power over their healthcare decisions, public acceptance of RS is crucial. This study aims to identify public understanding, opinions and misconceptions on RS and present solutions to facilitate its wider integration.
Method
An online questionnaire distributed via social media platforms between February and May 2021 identified the views of UK adults on RS. The data was evaluated using thematic analysis, descriptive statistics, and statistical analysis. Statistical differences in age, gender, education level, and presence in the medical field were also sought.
Results
263 responses were obtained, with 216 (82.1%) analysed. Demographic differences provided significantly different results. Participants were relatively uninformed about RS, with a median knowledge score of 4.00(2.00–6.00) on a 10-point likert scale. Fears surrounding increased risk, reduced precision and technological failure were identified, alongside misconceptions on what RS entails, including it being autonomous. However, providing factual information in the survey about RS statistically increased participant comfort (p=<0.0001). Most (61.8%) participants believed robot manufacturers were responsible for malfunctions, but doctors were held accountable more by older, less educated, and non-medical participants.
Conclusions
This study highlights the role of negative and inaccurate public perceptions surrounding RS in impeding its widespread adoption. Greater emphasis must be placed on patient education in RS to mitigate misconceptions and ensure greater diffusion of its benefits
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Affiliation(s)
- S. Arshad
- Imperial College London, London, United Kingdom
- University of Leeds, Leeds, United Kingdom
| | - G. Brar
- Imperial College London, London, United Kingdom
| | - S. Xu
- Imperial College London, London, United Kingdom
| | - N. Ramesh
- Imperial College London, London, United Kingdom
| | - K. Talajia
- Imperial College London, London, United Kingdom
| | - M. Anwar
- Imperial College London, London, United Kingdom
- University of Manchester, Manchester, United Kingdom
| | - A. ter Wal
- Imperial College London, London, United Kingdom
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9
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Ramesh N, Talajia K, Anwar M, Arshad S, Xu S, Brar G, ter Wal A. 219 The Opportunities and Challenges of Robotic Surgery: A Surgeon and Robotic Company Perspective. Br J Surg 2022. [DOI: 10.1093/bjs/znac039.138] [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: 11/13/2022]
Abstract
Abstract
Introduction
As an increasing number of specialties have begun to adopt robotic surgery (RS), its prevalence within the NHS is continually rising. This study aims to establish stakeholders’ opinions on the opportunities and challenges of the widespread adoption of RS.
Method
Participants were recruited through social media platforms such as LinkedIn or via university affiliations and current RS research. Semi-structured interviews of eight surgeons and five company representatives were conducted online. Transcripts were analysed to formulate themes surrounding the opportunities and challenges of RS.
Results
This study identified six common themes amongst shareholders: Perspective, Ethics, Impact of Robotics, Training, Adoption and Finances. The success rates and quality of results offered by RS make it a recognised future surgical staple amongst interviewees. However, the technology remains a contentious subject amongst surgeons, with many doubting whether the benefits outweigh the costs associated with implementation. Such reservations are further exacerbated by the absence of a formal training pathway. National guidelines are necessary to embed RS within the NHS infrastructure, allowing greater standardisation for patients and surgeons. The importance of patient education to address misconceptions was emphasised. Despite current high costs, robotic technology is forecasted to become cheaper with greater use and increased market competition. Interviewees stressed that responsibility for errors lies with the surgeon, but with the manufacturer for instrument malfunctions.
Conclusions
This study highlights stakeholders’ views on the opportunities and challenges of RS. The identified themes should form the basis of the proposed recommendations to facilitate a more widespread adoption of RS.
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Affiliation(s)
- N. Ramesh
- Imperial College London, London, United Kingdom
| | - K. Talajia
- Imperial College London, London, United Kingdom
| | - M. Anwar
- Imperial College London, London, United Kingdom
- The University of Manchester, Manchester, United Kingdom
| | - S. Arshad
- Imperial College London, London, United Kingdom
- University of Leeds, Leeds, United Kingdom
| | - S. Xu
- Imperial College London, London, United Kingdom
| | - G. Brar
- Imperial College London, London, United Kingdom
| | - A. ter Wal
- Imperial College London, London, United Kingdom
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10
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De S, Chaudhuri SR, Panda A, Jadhav GR, Kumar RS, Manohar P, Ramesh N, Mondal A, Moorthy A, Banerjee S, Paira P, Kumar SKA. Synthesis, characterisation, molecular docking, biomolecular interaction and cytotoxicity studies of novel ruthenium(ii)–arene-2-heteroarylbenzoxazole complexes. NEW J CHEM 2019. [DOI: 10.1039/c8nj04999h] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ru(ii)–arene-2-heteroarylbenzoxazole complexes were synthesized and implemented for their biological evaluation.
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Affiliation(s)
- Sourav De
- Department of Chemistry, School of Advance Sciences, Vellore Institute of Technology
- Vellore-632014
- India
| | - Shreya Ray Chaudhuri
- Department of Chemistry, School of Advance Sciences, Vellore Institute of Technology
- Vellore-632014
- India
| | - Arpita Panda
- Department of Chemistry, School of Advance Sciences, Vellore Institute of Technology
- Vellore-632014
- India
| | - Gajanan Rahosaheb Jadhav
- Department of Chemistry, School of Advance Sciences, Vellore Institute of Technology
- Vellore-632014
- India
| | - R. Selva Kumar
- Department of Chemistry, School of Advance Sciences, Vellore Institute of Technology
- Vellore-632014
- India
| | - Prasanth Manohar
- Department of Biotechnology, School of Bioscience & Technology, Vellore Institute of Technology
- Vellore 632014
- India
| | - N. Ramesh
- Department of Biotechnology, School of Bioscience & Technology, Vellore Institute of Technology
- Vellore 632014
- India
| | - Ashaparna Mondal
- Department of Chemistry, School of Advance Sciences, Vellore Institute of Technology
- Vellore-632014
- India
| | - Anbalagan Moorthy
- Department of Biotechnology, School of Bioscience & Technology, Vellore Institute of Technology
- Vellore 632014
- India
| | - Subhasis Banerjee
- Department of Pharmaceutical Chemistry, Gupta College of Technological Sciences
- Asansol-713301
- India
| | - Priyankar Paira
- Department of Chemistry, School of Advance Sciences, Vellore Institute of Technology
- Vellore-632014
- India
| | - S. K. Ashok Kumar
- Department of Chemistry, School of Advance Sciences, Vellore Institute of Technology
- Vellore-632014
- India
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11
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Charanraj T, Ramachandra P, Ramesh N, Junjappa H. Synthesis of Hitherto Unknown 4,4-Bis(methylthio)but-3-en-2-one-1,1,1,3- d4 and Its Application as 1,3-Dielectrophilic Building Block for the Synthesis of Deuterated Heterocycles and Aromatics. LETT ORG CHEM 2018. [DOI: 10.2174/1570178615666171205095718] [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: 11/22/2022]
Affiliation(s)
- T.P. Charanraj
- Chemistry Research Unit, REVA Institute of Science and Management, Bangalore-560064, India
| | - P. Ramachandra
- Department of Chemistry, REVA Institute of Technology and Management, Bangalore-560064, India
| | - N. Ramesh
- Director Planning, REVA University, Bangalore-560064, India
| | - H. Junjappa
- Chemistry Research Unit, REVA Institute of Science and Management, Bangalore-560064, India
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12
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Mohana krishnudu D, Sreeramulu D, Ramesh N. Synthesis, Characterization, and Properties of Epoxy Filled Luffa cylindrica reinforced composites. ACTA ACUST UNITED AC 2018. [DOI: 10.1016/j.matpr.2017.11.637] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bhardwaj V, Ramesh N, Mandal A. MON-P113: EGCG Induced Mirna-Mediated Regulation in Non-Small Cell Lung Cancers (NSCLCS)-NGS Approach. Clin Nutr 2017. [DOI: 10.1016/s0261-5614(17)30971-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ramesh N, Ramesh S, Vennila G, Abdul Bari J, MageshKumar P. Energy production through organic fraction of municipal solid waste-A multiple regression modeling approach. Ecotoxicol Environ Saf 2016; 134:350-357. [PMID: 26434708 DOI: 10.1016/j.ecoenv.2015.08.027] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 08/14/2015] [Accepted: 08/27/2015] [Indexed: 06/05/2023]
Abstract
In the 21st century, people migrated from rural to urban areas for several reasons. As a result, the populations of Indian cities are increasing day by day. On one hand, the country is developing in the field of science and technology and on the other hand, it is encountering a serious problem called 'Environmental degradation'. Due to increase in population, the generation of solid waste is also increased and is being disposed in open dumps and landfills which lead to air and land pollution. This study is attempted to generate energy out of organic solid waste by the bio- fermentation process. The study was conducted for a period of 7 months at Erode, Tamilnadu and the reading on various parameters like Hydraulic retention time, organic loading rate, sludge loading rate, influent pH, effluent pH, inlet volatile acids, out let volatile fatty acids, inlet VSS/TS ratio, outlet VSS/TS ratio, influent COD, effluent COD and % of COD removal are recorded for every 10 days. The aim of the present study is to develop a model through multiple linear regression analysis with COD as dependent variable and various parameters like HRT, OLR, SLR, influent, effluent, VSS/TS ratio, influent COD, effluent COD, etc as independent variables and to analyze the impact of these parameters on COD. The results of the model developed through step-wise regression method revealed that only four parameters Influent COD, effluent COD, VSS/TS and Influent/pH were main influencers of COD removal. The parameters influent COD and VSS/TS have positive impact on COD removal and the parameters effluent COD and Influent/pH have negative impact. The parameter Influent COD has the highest order of impact, followed by effluent COD, VSS/TS and influent pH. The other parameters HRT, OLR, SLR, INLET VFA and OUTLET VFA were not significantly contributing to the removal of COD. The implementation of the process suggested through this study might bring in dual benefit to the community, viz treatment of solid waste and creation of energy.
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Affiliation(s)
- N Ramesh
- Department of Civil Engineering, K.S. Rangasamy College of Technology, Tiruchengode 637215, Tamilnadu, India.
| | - S Ramesh
- Department of Civil Engineering, K.S. Rangasamy College of Technology, Tiruchengode 637215, Tamilnadu, India.
| | - G Vennila
- Department of Civil Engineering, K.S. Rangasamy College of Technology, Tiruchengode 637215, Tamilnadu, India.
| | - J Abdul Bari
- Department of Civil Engineering, K.S. Rangasamy College of Technology, Tiruchengode 637215, Tamilnadu, India.
| | - P MageshKumar
- Department of Civil Engineering, K.S. Rangasamy College of Technology, Tiruchengode 637215, Tamilnadu, India.
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Sanneerappa PBJ, Gul R, Nadeem M, Ramesh N. Arachnoid Cyst: An Unusual Cause for Increased Alkaline Phosphatase. Ir Med J 2016; 109:475. [PMID: 28125189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
| | - R Gul
- Midland Regional Hospital, Portlaoise, Republic of Ireland
| | - M Nadeem
- Adelaide and Meath Hospital, Tallaght, Dublin, Ireland
| | - N Ramesh
- Midland Regional Hospital, Portlaoise, Republic of Ireland
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Sanneerappa PJB, Cunningham L, Gallagher P, Ramesh N. An Unusual Case of Acquired (Delayed Onset) Cystic Hygroma in a Child. Ir Med J 2016; 109:459. [PMID: 28124858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
- P J B Sanneerappa
- Midland Regional Hospital, Portlaoise, Co. Laois, Republic of Ireland
| | - L Cunningham
- Midland Regional Hospital, Portlaoise, Co. Laois, Republic of Ireland
| | - P Gallagher
- Midland Regional Hospital, Portlaoise, Co. Laois, Republic of Ireland
| | - N Ramesh
- Midland Regional Hospital, Portlaoise, Co. Laois, Republic of Ireland
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Pradeepa Kumara C, Byre Gowda G, Kumar KV, Ramesh N, Sadashiva M, Junjappa H. Base catalyzed reaction of 1,4-dithiane-2,5-diol with α-oxoketene dithioacetals: a new general method for the synthesis of 2-methylthio-3-aroyl/heteroaroyl thiophenes. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.08.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Charanraj T, Ramachandra P, Ramesh N, Junjappa H. Fluorination of α-oxoketenedithioacetals: one-pot four-component synthesis of α-fluoro-α-oxoketenedithioacetals. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.06.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Pradeepa Kumara C, Byre Gowda G, Ramesh N, Sadashiva M, Junjappa H. A new general method for the synthesis of thiophenes through acid mediated cyclization of mixed acetals derived from β-oxodithiates and bromoacetaldehyde acetal. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.04.100] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Leo VV, Passari AK, Joshi JB, Mishra VK, Uthandi S, Ramesh N, Gupta VK, Saikia R, Sonawane VC, Singh BP. A Novel Triculture System (CC3) for Simultaneous Enzyme Production and Hydrolysis of Common Grasses through Submerged Fermentation. Front Microbiol 2016; 7:447. [PMID: 27065995 PMCID: PMC4815437 DOI: 10.3389/fmicb.2016.00447] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [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: 02/27/2016] [Accepted: 03/18/2016] [Indexed: 11/13/2022] Open
Abstract
The perennial grasses are considered as a rich source of lignocellulosic biomass, making it a second generation alternative energy source and can diminish the use of fossil fuels. In this work, four perennial grasses Saccharum arundinaceum, Panicum antidotale, Thysanolaena latifolia, and Neyraudia reynaudiana were selected to verify their potential as a substrate to produce hydrolytic enzymes and to evaluate them as second generation energy biomass. Here, cellulase and hemi-cellulase producing three endophytic bacteria (Burkholderia cepacia BPS-GB3, Alcaligenes faecalis BPS-GB5 and Enterobacter hormaechei BPS-GB8) recovered from N. reynaudiana and S. arundinaceum were selected to develop a triculture (CC3) consortium. During 12 days of submerged cultivation, a 55–70% loss in dry weight was observed and the maximum activity of β-glucosidase (5.36–12.34 IU) and Xylanase (4.33 to 10.91 IU) were observed on 2nd and 6th day respectively, whereas FPase (0.26 to 0.53 IU) and CMCase (2.31 to 4.65 IU) showed maximum activity on 4th day. Around 15–30% more enzyme activity was produced in CC3 as compared to monoculture (CC1) and coculture (CC2) treatments, suggested synergetic interaction among the selected three bacterial strains. Further, the biomass was assessed using Fourier-transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM). The FTIR analysis provides important insights into the reduction of cellulose and hemicellulose moieties in CC3 treated biomass and SEM studies shed light into the disruption of surface structure leading to access of cellulose or hemicelluloses microtubules. The hydrolytic potential of the CC3 system was further enhanced due to reduction in lignin as evidenced by 1–4% lignin reduction in biomass compositional analysis. Additionally, laccase gene was detected from A. faecalis and E. hormaechei which further shows the laccase production potential of the isolates. To our knowledge, first time we develop an effective endophytic endogenous bacterial triculture system having potential for the production of extracellular enzymes utilizing S. arundinaceum and N. reynaudiana as lignocellulosic feedstock.
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Affiliation(s)
- Vincent V Leo
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Mizoram UniversityAizawl, India; Department of Biotechnology, J.J College for Arts and SciencePudukkottai, India
| | - Ajit K Passari
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Mizoram University Aizawl, India
| | - J Beslin Joshi
- Biocatalysts Lab, Department of Agricultural Microbiology, Tamil Nadu Agricultural University Coimbatore, India
| | - Vineet K Mishra
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Mizoram University Aizawl, India
| | - Sivakumar Uthandi
- Biocatalysts Lab, Department of Agricultural Microbiology, Tamil Nadu Agricultural University Coimbatore, India
| | - N Ramesh
- Department of Biotechnology, J.J College for Arts and Science Pudukkottai, India
| | - Vijai K Gupta
- Molecular Glyco-biotechnology Group, Department of Biochemistry, National University of Ireland Galway Galway, Ireland
| | - Ratul Saikia
- Biotechnology Division, CSIR-North East Institute of Science and Technology Jorhat, Assam, India
| | - Vijay C Sonawane
- Biochemical Engineering Research and Process Development Centre (BERPDC), Institute of Microbial Technology Chandigarh, India
| | - Bhim P Singh
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Mizoram University Aizawl, India
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Byre Gowda G, Pradeepa kumara C, Ramesh N, Sadashiva M, Junjappa H. Base catalyzed reaction of ethyl thioglycolate with β-aryl-β-(methylthio) acroleins: a general method for the synthesis of 2-carbethoxy-5-substituted/4,5-annulated thiophenes in high overall yields. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.01.055] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Maurya VK, Srinvasan R, Ramesh N, Anbalagan M, Gothandam K. Expression of Carotenoid Pathway Genes in Three Capsicum Varieties under Salt Stress. ACTA ACUST UNITED AC 2015. [DOI: 10.3923/ajcs.2015.286.294] [Citation(s) in RCA: 5] [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: 11/15/2022]
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Byre Gowda G, Charanraj T, Pradeepa Kumara C, Ramesh N, Thomas S, Sadashiva M, Junjappa H. Synthesis of novel β-aryl-β-(methylthio)acroleins via Vilsmeier–Haack protocol as potential 1,3-dielectrophilic three-carbon building blocks. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.06.065] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Rajan S, Colaco S, Ramesh N, Meyyanathan SN, Elango K. Development and validation of dissolution study of sustained release dextromethorphan hydrobromide tablets. Pak J Biol Sci 2014; 17:429-433. [PMID: 24897800 DOI: 10.3923/pjbs.2014.429.433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This study describes the development and validation of dissolution tests for sustained release Dextromethorphan hydrobromide tablets using an HPLC method. Chromatographic separation was achieved on a C18 column utilizing 0.5% triethylamine (pH 7.5) and acetonitrile in the ratio of 50:50. The detection wavelength was 280 nm. The method was validated and response was found to be linear in the drug concentration range of 10-80 microg mL(-1). The suitable conditions were clearly decided after testing sink conditions, dissolution medium and agitation intensity. The most excellent dissolution conditions tested, for the Dextromethorphan hydrobromide was applied to appraise the dissolution profiles. The method was validated and response was found to be linear in the drug concentration range of 10-80 microg mL(-1). The method was established to have sufficient intermediate precision as similar separation was achieved on another instrument handled by different operators. Mean Recovery was 101.82%. Intra precisions for three different concentrations were 1.23, 1.10 0.72 and 1.57, 1.69, 0.95 and inter run precisions were % RSD 0.83, 1.36 and 1.57%, respectively. The method was successfully applied for dissolution study of the developed Dextromethorphan hydrobromide tablets.
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Premananda RM, Ramesh N, Hillol KP. Functional outcome of microsurgical clipping compared to endovascular coiling. Med J Malaysia 2012; 67:585-590. [PMID: 23770950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Endovascular coiling has been used increasingly as an alternative to neurosurgical clipping for treating subarachnoid hemorrhage secondary to aneurysm rupture. In a retrospective cohort review on the treatment methods of aneurysm rupture in Hospital Kuala Lumpur over the period of five years (2005-2009) a total of 268 patients were treated. These patients were broadly categorized into two groups based on their treatment mode for ruptured aneurysms. Statistical analysis was determined using Chi- Square tests to study these associations. In our study, 67.5% of patients presented with Good World Federation of Neurosurgical Societies (WFNS) grade (WFNS1-2) while 32.5% patients presented with Poor WFNS prior to intervention. In our outcome, it was noted that 60.4% had good functional outcome (mRS grade 0-2) as compared to 39.6% patients who had poor mRS(modified rankin scale) outcome (mRS 3-6). In the good WFNS group, 76% of patients in clipping group had a good mRS outcome while, 86.5% patients in coiling group had good mRS outcome (p=0.114). In poor WFNS presentation, it was noted that in 77.3% patients in clipping group, had poor mRS outcome. Similarly with poor WFNS presentation, 83.3% of patient in coiling group had poor outcome. (p=1.00). Hence when we control the WFNS group, there was no significant association between treatment group (clipping and coiling) and mRS outcome at 6 months. The outcome of patient is determined by initial clinical presentation (WFNS grade) and influenced by requirement of Extraventricular drain (EVD) in presence of hydrocephalus, CSF infection and pneumonia. Therefore the decision regarding treatment option needs to be individualized based on the presentation of the patient.
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Affiliation(s)
- R M Premananda
- Universiti Sains Malaysia, Kota Bharu, Kelantan, Malaysia.
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Kannan VR, Rajasekar GS, Rajesh P, Balasubram V, Ramesh N, Solomon EK, Nivas D, Chandru S. Anti-diabetic Activity on Ethanolic Extracts of Fruits of Terminalia chebula Retz. Alloxan Induced Diabetic Rats. ACTA ACUST UNITED AC 2012. [DOI: 10.3923/ajdd.2012.135.142] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Ramesh N, Davis PK, Zielinski JM, Danner RP, Duda JL. Application of free-volume theory to self diffusion of solvents in polymers below the glass transition temperature: A review. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/polb.22366] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Yadav RK, Prasad SK, Deolekar SS, Babu KS, Ramesh N, Ranjan R, Meena TR. Radiological safety study of clad failed fuel handling during fifty years of operation of cirus. Radiat Prot Environ 2011. [DOI: 10.4103/0972-0464.106180] [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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Tirth A, Tangade P, Mathur A, Srivastava BK, Ramesh N, Ravishankar TL. Comparison of oral health status between brass industry workers and non Industrial workers of Moradabad City. J Indian Assoc Public Health Dent 2011. [DOI: 10.4103/2319-5932.173740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023] Open
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Kumar VN, Ramesh N, Reddy VVK. Prevalence of Traumatic Dental Injuries to Permanent Incisors among 12 years Old School Children in Tandoor, Andhra Pradesh. J Indian Assoc Public Health Dent 2011. [DOI: 10.4103/2319-5932.185420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023] Open
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Mahalakshm R, Rajesh P, Ramesh N, Balasubram V, Kannan VR. Hepatoprotective Activity on Vitex negundo Linn. (Verbenaceae) by using Wistar Albino Rats in Ibuprofen Induced Model. INT J PHARMACOL 2010. [DOI: 10.3923/ijp.2010.658.663] [Citation(s) in RCA: 9] [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: 11/15/2022]
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Balasubramanian V, Natarajan K, Hemambika B, Ramesh N, Sumathi CS, Kottaimuthu R, Rajesh Kannan V. High-density polyethylene (HDPE)-degrading potential bacteria from marine ecosystem of Gulf of Mannar, India. Lett Appl Microbiol 2010; 51:205-11. [PMID: 20586938 DOI: 10.1111/j.1472-765x.2010.02883.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS Assessment of high-density polyethylene (HDPE)-degrading bacteria isolated from plastic waste dumpsites of Gulf of Mannar. METHODS AND RESULTS Rationally, 15 bacteria (GMB1-GMB15) were isolated by enrichment technique. GMB5 and GMB7 were selected for further studies based on their efficiency to degrade the HDPE and identified as Arthrobacter sp. and Pseudomonas sp., respectively. Assessed weight loss of HDPE after 30 days of incubation was nearly 12% for Arthrobacter sp. and 15% for Pseudomonas sp. The bacterial adhesion to hydrocarbon (BATH) assay showed that the cell surface hydrophobicity of Pseudomonas sp. was higher than Arthrobacter sp. Both fluorescein diacetate hydrolysis and protein content of the biofilm were used to test the viability and protein density of the biomass. Acute peak elevation was observed between 2 and 5 days of inoculation for both bacteria. Fourier transform infrared (FT-IR) spectrum showed that keto carbonyl bond index (KCBI), Ester carbonyl bond index (ECBI) and Vinyl bond index (VBI) were increased indicating changes in functional group(s) and/or side chain modification confirming the biodegradation. CONCLUSION The results pose us to suggest that both Pseudomonas sp. and Arthrobacter sp. were proven efficient to degrade HDPE, albeit the former was more efficacious, yet the ability of latter cannot be neglected. SIGNIFICANCE AND IMPACT OF THE STUDY Recent alarm on ecological threats to marine system is dumping plastic waste in the marine ecosystem and coastal arena by anthropogenic activity. In maintenance phase of the plastic-derived polyethylene waste, the microbial degradation plays a major role; the information accomplished in this work will be the initiating point for the degradation of polyethylene by indigenous bacterial population in the marine ecosystem and provides a novel eco-friendly solution in eco-management.
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Affiliation(s)
- V Balasubramanian
- Rhizosphere Biology Laboratory, Department of Microbiology, School of Life Sciences, Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
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Subbiah P, Ramesh N, Sundaravadivelu K, Samuel P, Tyagi BK. Larvicidal efficacy of various formulations of Bacillus sphaericus against the resistant strain of Culex quinquefasciatus (Diptera: Culicidae) from southern India. Trop Biomed 2009; 26:23-29. [PMID: 19696724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Use of Bacillus sphaericus Neide (Bs) as potential biolarvicide in developing countries is limited due to development of resistance by target mosquitoes. Efforts are taken to look for appropriate formulations or combination of Bs to prevent or delay resistance problem. Here, we report the efficacy of a formulated Bs product to kill Bs resistant Culex quinquefasciatus Say larvae. The laboratory reared resistance colony was maintained by subjecting selection pressure with Bs (2362) toxin. Bioassays were conducted with lyophilized, standard formulated and Bs formulated by us (all belong to strain 2362, serotype H5a5b) against Bs resistant and susceptible colonies. The Bs resistant larvae showed a high level of resistance against lyophilized toxin with resistance ratio (RR) of 8375.2, 1055.6 and 11422.3 folds at LC(50), LC(90) and LC(95) levels, respectively, when compared with Bs susceptible larvae. With formulation of standard powder, the RR between Bs resistant and susceptible larvae were 1.01, 1.13 and 1.19 folds only at LC(50), LC(90) and LC(95) levels, respectively. This observation was comparable with our formulation prepared by a ground mixture of lyophilized Bs and a placebo (plaster of Paris). It is evident from our study, that the placebo present in our Bs 2362 formulation was responsible for increasing the efficacy of Bs lyophilized toxin against resistant larvae. The putative mechanism behind this toxicity phenomenon remains to be investigated to evolve new mosquito control strategies. A cross resistance to indigenous strain of Bs B42 (H5a5b) against Bs resistant larvae was also reported in this study.
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Affiliation(s)
- P Subbiah
- Centre for Research in Medical Entomology (Indian Council of Medical Research, Govt. of India), Chinna Chokkikulam, Madurai, Tamil Nadu, India.
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Soni S, Ramesh N. HIV transmission within families in rural India. Int J STD AIDS 2009; 20:214-5. [DOI: 10.1258/ijsa.2009.009004] [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: 11/18/2022]
Affiliation(s)
- S Soni
- Department of Genitourinary Medicine, St Thomas' Hospital, Lambeth Palace Road, London SE1 7EH, UK
- Department of Infectious Diseases
| | - N Ramesh
- Department of Community Medicine, St John's Medical College, Bangalore, India
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Sabariah FJ, Ramesh N, Mahathar AW. National Trauma Database (NTrD)--improving trauma care: first year report. Med J Malaysia 2008; 63 Suppl C:45-49. [PMID: 19227673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The first Malaysian National Trauma Database was launched in May 2006 with five tertiary referral centres to determine the fundamental data on major trauma, subsequently to evaluate the major trauma management and to come up with guidelines for improved trauma care. A prospective study, using standardized and validated questionnaires, was carried out from May 2006 till April 2007 for all cases admitted and referred to the participating hospitals. During the one year period, 123,916 trauma patients were registered, of which 933 (0.75%) were classified as major trauma. Patients with blunt injury made up for 83.9% of cases and RTA accounted for 72.6% of injuries with 64.9% involving motorcyclist and pillion rider. 42.8% had severe head injury with an admission Glasgow Coma Scale (GCS) of 3-8 and the Revised Trauma Score (RTS) of 5-6 were recorded in 28.8% of patients. The distribution of Injury Severity Score (ISS) showed that 42.9% of cases were in the range of 16-24. Only 1.9% and 6.3% of the patients were reviewed by the Emergency Physician and Surgeon respectively. Patients with admission systolic blood pressure of less than 90 mmHg had a death rate of 54.6%. Patients with severe head injury (GCS < 9), 45.1% died while 79% patients with moderate head injury survived. There were more survivors within the higher RTS range compared to the lower RTS. Patients with direct admission accounted for 52.3% of survivors and there were 61.7% survivors for referred cases. In conclusion, NTrD first report has successfully demonstrated its significance in giving essential data on major trauma in Malaysia, however further expansion of the study may reflect more comprehensive trauma database in this country.
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Affiliation(s)
- F J Sabariah
- Emergency Department, Sungai Buloh Hospital, 47000 Sungai Buloh, Selangor, Malaysia
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Ramesh N, Pillai RK, Abraham T, Padmaja NP, Hameed S, Vijayaraghavan G. Reno-protective effect of N-acetyl cysteine in patients with impaired renal function undergoing coronary angiography and interventions. J Assoc Physicians India 2006; 54:449-52. [PMID: 16909692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
BACKGROUND The increasingly frequent use of contrast enhanced imaging for diagnosis or interventions in patients with CAD has generated concern about avoidance of contrast induced nephropathy (CIN). Reactive oxygen species have been shown to cause CIN. OBJECTIVES Angiographic contrasts worsen the renal function in patients with renal failure. We studied the reno-protective action of the antioxidant N-Acetyl cysteine (NAC) in patients undergoing coronary procedures. METHODS Retrospective analysis of 51 patients with elevated serum creatinine levels (> or = 15mg%) was done, 24 of whom received NAC prior to the procedure(NAC group) and 27 who did not (Non NAC group). NAC was administered in a dose of 400 mg twice daily for four doses starting on the day prior to the procedure. Both groups of patients were hydrated with 0.45% saline at 1 ml/kg/hr for 12 hours prior to and 12 hours following the procedure. Both groups were comparable with regard to age, sex, coronary risk profile, myocardial infarction history, left ventricular function and the drugs received. Serum urea and creatinine were measured on the day prior to and the day following the angiographic procedure. RESULTS Nine out of 51 patients developed more than 0.5mg% rise in serum creatinine level; 1 in the NAC group and 8 in the non NAC group (p<0.05), 24 hours after injection of the contrast medium. In the NAC group mean serum creatinine level decreased from 1.94 +/- 0.56 to 1.67 +/- 0.56 and blood urea from 47.58 +/- 20 to 41.58 +/- 15.1. In the non NAC group serum creatinine increased from 1.75 +/- 0.31 to 1.98 +/- 0.56 and blood urea from 44.96 +/- 15.5 to 52.85 +/- 20.1 (p<0.05). This corresponds to an increase in creatinine clearance from 30ml/min to 35.92ml/min in the NAC group and a decrease from 34.42ml/min to 29.87ml/min in the non NAC group. There was no significant difference in the levels of sodium and potassium before and after the procedure in both the groups. CONCLUSION We conclude that prophylactit administration of N-Acetyl Cysteine along with hydration diminishes the incidence of deterioration of renal function induced by contrast agents in patients with renal insufficiency during coronary angiographic procedures.
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Affiliation(s)
- N Ramesh
- Department of Cardiology, Kerala Institute of Medical Sciences, Trivandrum
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Beddy P, Geoghegan T, Ramesh N, Buckley O, O'Brien J, Colville J, Torreggiani WC. Valsalva and gravitational variability of the internal jugular vein and common femoral vein: Ultrasound assessment. Eur J Radiol 2006; 58:307-9. [PMID: 16352411 DOI: 10.1016/j.ejrad.2005.11.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2005] [Revised: 10/26/2005] [Accepted: 11/03/2005] [Indexed: 11/15/2022]
Abstract
PURPOSE Central venous cannulation via the common femoral vein is an important starting point for many interventions. The purpose of this study was to determine the optimum conditions for cannulation of the femoral vein and to compare these with the relative changes in the internal jugular vein. METHODS High-resolution 2D ultrasound was utilised to determine variability of the calibre of the femoral and internal jugular veins in 10 healthy subjects. Venous diameter was assessed during the Valsalva manoeuvre and in different degrees of the Trendelenburg position. RESULTS The Valsalva manoeuvre significantly increased the size of the femoral and internal jugular veins. There was a relatively greater increase in femoral vein diameter when compared with the internal jugular vein of 40 and 29%, respectively. Changes in body inclination (Trendelenburg position) did not significantly alter the luminal diameter of the femoral vein. However, it significantly increased internal jugular vein diameter. CONCLUSIONS Femoral vein cannulation is augmented by the Valsalva manoeuvre but not significantly altered by the gravitational position of the subject.
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Affiliation(s)
- P Beddy
- Department of Radiology, The Adelaide and Meath Hospital, Tallaght, Dublin 24, Ireland.
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Venkatesan M, Viswanathan MB, Ramesh N, Lakshmanaperumalsamy P. Antibacterial potential from Indian Suregada angustifolia. J Ethnopharmacol 2005; 99:349-52. [PMID: 15878247 DOI: 10.1016/j.jep.2005.01.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2003] [Revised: 12/13/2004] [Accepted: 01/05/2005] [Indexed: 05/02/2023]
Abstract
Phytochemical analysis of the leaves from Indian Suregada angustifolia (Baill. ex Muell. Arg.) Airy Shaw (Euphorbiaceae) resulted in the isolation and identification of six known compounds, viz. friedelin, epi-friedelinol, n-octacosanol, alpha-amyrin, beta-sitosterol and beta-sitosterol-3-beta-D-glucopyranoside. Aqueous (room temperature, boiled and autoclaved) and various solvent (methanol, chloroform and hexane) extracts of leaves were tested against 12 human pathogenic bacteria by the agar well-diffusion method. Aqueous extracts did not express any activity. Antibacterial activity was recorded in the order of methanol, hexane and chloroform extracts. Maximum activity recorded against Staphylococcus aureus (skin infections) in methanol and hexane extracts and moderate activity recorded against diarrhoea causing bacteria, Vibrio vulnificus (hexane extract) and Vibrio cholerae (chloroform extract).
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Affiliation(s)
- M Venkatesan
- Sri Paramakalyani Centre for Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi 627 412, Tamil Nadu, India
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Abstract
Endovascular grafting of abdominal aortic aneurysms provides a good alternative to open surgery, especially in high-risk patients. Endoleaks are a well-recognized complication and are typically diagnosed on CT. We describe a case in which a patient's endoleak was evaluated by MRI and successfully treated by direct thrombin injection into the site of the leak.
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Affiliation(s)
- N El-Saeity
- Department of Radiology, Adelaide and Meath Incorporating National Children's Hospital, Tallaght, Dublin, Ireland
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Sasahara Y, Rachid R, Byrne M, Fuente MDL, Ramesh N, Geha R. Mechanism of recruitment of WASP-WIP complex to the immunological synapse and of WASP activation following TCR ligation. J Allergy Clin Immunol 2003. [DOI: 10.1016/s0091-6749(03)80646-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Thangadurai D, Viswanathan MB, Ramesh N. Indigoferabietone, a novel abietane diterpenoid from Indigofera longeracemosa with potential antituberculous and antibacterial activity. Pharmazie 2002; 57:714-5. [PMID: 12426956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
Abstract
From the stems of Indigofera longeracemosa, a novel abietane diterpenoid, indigoferabietone was isolated. The structure was established by spectral techniques. The inhibitory activity of indigoferabietone (1) tested against Mycobacterium tuberculosis and Candida albicans, and the antibacterial activity tested against Staphylococcus aureus, Proteus vulgaris, and Escherichia coli were found to be significant.
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Affiliation(s)
- D Thangadurai
- Department of Botany, Sri Krishnadevaraya University, Anantapur, Andhra Pradesh, India.
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Ramesh N, Joseph SW, Carr LE, Douglass LW, Wheaton FW. Evaluation of chemical disinfectants for the elimination of Salmonella biofilms from poultry transport containers. Poult Sci 2002; 81:904-10. [PMID: 12079060 DOI: 10.1093/ps/81.6.904] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Containers used in transporting live poultry between production and processing units are a primary source of contamination for processed poultry products. Because disinfection of transport containers (TC) has been difficult to accomplish, it is probable that the choice of appropriate disinfectant and its application are partially or wholly responsible for the failure to adequately eliminate pathogens from TC. Therefore, 13 commercial disinfectants were selected and evaluated for their capacities to destroy Salmonella. The disinfectants were applied in various concentrations on prescribed areas (10 cm diameter circle) of galvanized steel surfaces (representative of TC material) that were artificially contaminated with Salmonella (10(8) cfu/mL) with a mixture of organic material. Likewise, coupons (1.9 cm2) made of the same metallic surfaces and covered with biofilms of Salmonella spp. were tested in the same manner for each disinfectant. Two of the disinfectants completely eliminated Salmonella on the artificially contaminated and biofilm-covered surfaces. These compounds produced logarithmic reductions in Salmonella populations as high as 7.18 within 2 min. One of the two effective disinfectants contained sodium hypochlorite and was effective at a concentration of 0.05% (vol/vol). The other disinfectant was an alkaline peroxide compound and was effective at a concentration of 1% (wt/vol). Evaluation of these two disinfectants under simulated conditions suggested that application under the prescribed regimen could result in effective elimination of Salmonella from TC within a limited period.
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Affiliation(s)
- N Ramesh
- Department of Biological Resources Engineering, University of Maryland, College Park 20742, USA
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El-Saeity N, Ramesh N, Browne R, Al-Agha G, Torreggiani W. Imaging of Ascaris lumbricoides in the common bile duct and small intestine. Ir J Med Sci 2002; 171:120. [PMID: 12173888 DOI: 10.1007/bf03168970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Abstract
The aqueous, methanol, chloroform and hexane extracts of Swertia corymbosa were tested (in vitro) for their antimicrobial efficiency. Maximum inhibitory activity was noticed against Staphylococcus aureus and Salmonella typhi.
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Affiliation(s)
- N Ramesh
- Sri Paramakalyani Centre for Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi 627 412, Tamil Nadu, India.
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Cai WD, Ramesh N, Tihminlioglu F, Danner RP, Duda JL, DèHaan A. Phase equilibrium and diffusion of solvents in polybutadiene: A capillary-column inverse gas chromatography study. ACTA ACUST UNITED AC 2002. [DOI: 10.1002/polb.10156] [Citation(s) in RCA: 8] [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: 11/10/2022]
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Ramesh N, Vuayaraghavan AS, Desai BS, Natarajan M, Murthy PB, Pillai KS. Low levels of p53 mutations in Indian patients with osteosarcoma and the correlation with fluoride levels in bone. J Environ Pathol Toxicol Oncol 2002; 20:237-43. [PMID: 11797833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
The pathogenesis of osteogenic sarcoma is not known. Recently, chronic fluoride exposure has been incriminated as having a possible etiologic role by causing a nonspecific osteoblast proliferation. We were interested in exploring the possible relationship between fluoride bone content and p53 mutations. We analyzed p53 mutations in various exons in tissue of osteosarcoma, and correlated the findings with the bone fluoride levels in Indian patients. We analyzed tissue samples from 20 osteosarcoma patients for possible genetic alterations including mutations, and we assessed the extent of fluoride accumulation in bone. Fragments displaying an altered electrophoretic mobility were confirmed as having mutated sequences. Mutation was observed in samples of two cases (10% incidence). Eighteen samples showed bone fluoride levels between 1000 and 27,000 ppm, whereas the 2 mutated samples showed fluoride levels of 64,000 and 89,000 ppm, respectively. The high levels of bone fluoride levels and the similarity of the mechanisms of action between fluoride-induced DNA damage and chemically-induced p53 mutations lead us to propose that high fluoride bone content might have been one of the major factors causing osteosarcoma.
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Affiliation(s)
- N Ramesh
- Frederick Institute of Plant Protection and Toxicology, Padappai, Tamil Nadu, India
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Anuradha KP, Chadrashekar J, Ramesh N. Prevalence of periodontal disease in endemically flourosed areas of Davangere Taluk, India. Indian J Dent Res 2002; 13:15-9. [PMID: 12420563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023] Open
Abstract
Success of fluoride in combating dental caries led to study of fluoride on periodontal disease, but studies are less reported in literature and results are varied in nature. To address this issue, the study was conducted to assess severity of periodontal disease among (n = 283) 36-45 years old adults residing in area of different concentration of fluoride in drinking water. The villages selected were having fluoride concentration in their drinking water are Shamnur (0.5 PPMF), Kundawada (1.1 ppmF) and Halebathi (3.17 ppm). Ion Selective Electrode Method (OrionUSA) estimated fluoride in drinking water. Community Periodontal Index (WHO, 1997) and Plaque Index (Silness and Loe, 1967) was used to assess periodontal status. There was consistent decrease in mean plaque score from 1.45+ _0.024 at 0.51 ppm, 1.21+ _0.009 at 1.1 ppm, and 1.12+ _0.08 at 3.17 ppm fluoride area. This difference was significant statistically (P < 0.001). As the fluoride concentration in drinking water increased there was decrease in severity of prevalence of periodontitis. This difference in observation was significant statistically (P < 0.05). There were no effects of fluoride on calculus, since little variability was found in three different fluoride areas. Thus it was concluded from the study results that the increase in fluoride concentration decreased the plaque accumulation. decreased the shallow and deep pockets. Hence lower prevalence and severity of periodontal disease.
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Affiliation(s)
- K P Anuradha
- Department of Community Dentistry, Bapuji Dental College & Hospital, Davangere 577 004, India
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Ramesh N, Viswanathan MB, Saraswathy A, Balakrishna K, Brindha P, Lakshmanaperumalsamy P. Phytochemical and antimicrobial studies of Begonia malabarica. J Ethnopharmacol 2002; 79:129-132. [PMID: 11744306 DOI: 10.1016/s0378-8741(01)00352-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Phytochemical investigation of the various extracts of the leaves of Begonia malabarica Lam. (Begoniaceae) resulted in the isolation and identification of six known compounds, viz. friedelin, epi-friedelinol, beta-sitosterol, luteolin, quercetin and beta-sitosterol-3-beta-D-glucopyranoside. The aqueous and organic solvent extracts were also tested against ten human pathogenic bacteria and four fungal strains by the agar-well diffusion method. All the extracts were devoid of antifungal activity against the tested fungi. The hexane extract did not show any activity. The aqueous extracts showed activity against the Gram-negative bacteria except Vibrio parahaemolyticus. The chloroform and methanol extracts showed activity against all the tested bacteria. The study supported the claim of the usefulness of the plant in respiratory tract infections and also suggests its use in diarrhoea and skin diseases caused by pathogenic bacteria.
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Affiliation(s)
- N Ramesh
- Sri Paramakalyani Centre for Environmental Sciences, Manonmaniam Sundaranar University, 627 412, Tamil Nadu, Alwarkurichi, India
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Onof C, Yameundjeu B, Paoli JP, Ramesh N. A Markov modulated Poisson process model for rainfall increments. Water Sci Technol 2002; 45:91-97. [PMID: 11888187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The problems encountered when using traditional rectangular pulse hierarchical point process models for fine temporal resolution and the growing number of available tip-time records suggest that rainfall increments from tipping-bucket gauges be modelled directly. Poisson processes are used with an arrival rate modulated by a Markov chain in continuous time. The paper shows how, by using two or three states for this chain, much of the structure of the rainfall intensity distribution and the wet/dry sequences can be represented for time-scales as small as 5 minutes.
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Affiliation(s)
- C Onof
- Department of Civil and Environmental Engineering, Imperial College, London, UK
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