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RISS 인기검색어
- 검색키워드
- 저자 : G. K. Sagar (검색결과 4 건)
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K. Sandeep,R. S. Negi,A. S. Panicker,Alok Sagar Gautam,D. S. Bhist,G. Beig,B. S. Murthy,R. Latha,Santosh Singh,S. Das 한국기상학회 2020 Asia-Pacific Journal of Atmospheric Sciences Vol.56 No.3
Extraction of organic carbon (OC) and elemental carbon (EC) were carried out over Srinagar, India, an ecologically sensitive semi-urban site in Garhwal Himalays. The PM2.5 sampling was carried out during January to December, 2017 over the site. The OC and EC were extracted from PM2.5 samples using a thermo optical OC/EC analyzer. Highest OC and EC concncentrations were found during postmonsoon (17.67 ± 1.1 μg/m3 OC and 6.34 ± 0.75 EC) and Winter (17.31 ± 3.045 μg/m3 OC and 6.32 ± 0.585 μg/m3 EC) seasons are attributed to boundary layer dynamics and anthropogenic activities. The lower concentration of OC/ EC was observed during monsoon season (11.64 ± 1.75 μgm−3 OC and 3.46 ± 0.19μgm−3 EC) owing to wet scavenging of aerosols and minimum count of forest fire/biomass buring incidences. Both pre-monsoon and post-monsoon season concentrations are also influenced by biomass burning in the IGP (Indo-Gangetic Plain) region and forest fires in the adjecent areas. The OC/EC ratio sounds that vehicular exhaust and biomass burning are the major source of OC/EC over the site. Generation of secondary organic carbon (SOC) at the region causes variability in OC/EC ratio in different seasons. It is found that 24–32% of PM2.5 is contributed by carbonaceous aerosols (OC and EC) over Srinagar. The pivotal role of meteorology in modulating OC/ EC concentrations has been illustared in detail.
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Anaerobic Digestion and In situ Electrohydrolysis of Dairy Bio-sludge
Krishnan Vijayaraghavan,G. K. Sagar 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.3
A novel treatment method based on anaerobic digestion and in-situ electrohydrolysis of dairy bio-sludge was investigated in this article. The electrohydrolysis was carried out inside the anaerobic reactor using graphite anode and stainless steel cathode. The electrons released by the graphite anode combines with the proton released due to electrohydrolysis of fatty acids which resulted in the formation of hydrogen gas. The experiments were conducted using a DC power source under continuous and intermittent mode of input voltage ranging from 0.5 to 2.5 V for varying influent volatile solids concentration at a pH 5.3 ± 0.2. The results favored intermittent mode of input voltage rather than continuous supply. For an influent total solid concentration of 7% (64,120 mg/L VS), intermittent input voltage of 2 V, and a hydraulic retention time of 15 days resulted in a volatile solids and soluble COD removal efficiency of 83 and 74%, while the cumulative gas generation was 1,051 L with a hydrogen content of 72%.
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Bhatt, Vaibhav D.,Khade, Prasad S.,Tarate, Sagar B.,Tripathi, Ajai K.,Nauriyal, Dev S.,Rank, Dharamshi N.,Kunjadia, Anju P.,Joshi, Chaitanya G. The Korean Society of Veterinary Science 2012 大韓獸醫學會誌 Vol.52 No.4
The expression profiles of inflammatory cytokines viz. interleukins (IL)-6, IL-8, IL-12, granulocyte macrophage-colony stimulating factor, interferon-${\gamma}$ and tumor necrosis factor-${\alpha}$ in response to subclinical mastitis in indigenous cattle breed Kankrej (n = 6), Gir (Bos indicus) (n = 12) and crossbred (Bos taurus${\times}$Bos indicus) (n = 7) were investigated using quantitative real time PCR. Significant correlation (p < 0.05) was observed between total bacterial load and somatic cell count (SCC) in all three breeds of cattle. All the cytokines were observed to be up-regulated compared to cows with healthy quarters, however, level of their expression varied among three breeds of cattle. In Kankrej most cytokines were found to be transcribed to higher levels than in other two breeds; the milk had higher load of bacteria but not so high SCC, implying that Kankrej has a higher inherent resistance against mastitis. The results of present study indicated that mammary glands of crossbred cattle are more sensitive to bacterial infection than indigenous breed of cattle as they elicit immune response at lower bacterial load and result into higher SCC. Research on identification of factors responsible for differentially expressed cytokines profiles and use of cytokines as immunomodulatory tools can pave way for formulating control strategies against bovine mastitis.
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A search for potential anti-HIV phytoconstituents from the natural product repository
Dharmraj V. Pathak,Sneha R. Sagar,Hardik G. Bhatt,Paresh K. Patel 경희대학교 융합한의과학연구소 2023 Oriental Pharmacy and Experimental Medicine Vol.23 No.4
A chronic, life threatening and immuno-suppressing malady caused by Human immunodeficiency virus (HIV) is formally known as Acquired Immune Deficiency Syndrome (AIDS). Currently, combinations of several anti-retroviral drugs are being used for the management of HIV infection. These drugs possess certain limitations and hence researchers across the globe are striving to explore treatment methodologies based on medicinal plants of natural origin in order to develop safe and effective treatment. In this review, various medicinal plants are categorized on the basis of target of action namely Reverse transcriptase enzyme, Protease enzyme, Integrase enzyme, cell fusion, CC chemokine receptor 5 (CCR5) CXC chemokine receptor 4 (CXCR4). Medicinal plants exhibiting multi-targeted activities against various targets of HIV are also reviewed. Detail description of medicinal plants with their habitat, common names, category of systems of medicines, phytoconstituents and their biological activities in terms of relative % inhibition or IC50 or EC50 are provided in this review. Anti-HIV benefits of these plants are observed due to phytoconstituents like terpenoids, tannins, alkaloids, polyphenols, coumarins, flavonoids, etc. In order to gain the structural knowledge for future developments of anti-HIV leads, ligand based pharmacophore was generated using phytoconstituents mentioned in this review. Structural modifications of these phytoconstituents on hydrophobic, donor and acceptor regions are beneficial for the potent anti-HIV activity. In conclusion, this study may prove to be a stepping stone towards the use of herbal medicinal plants for the management of HIV/AIDS and may aspire researchers to look for new treatment options from the natural sources.
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