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排序方式: 共有188条查询结果,搜索用时 15 毫秒
51.
52.
Bajpai R Upreti DK Mishra SK 《Journal of environmental biology / Academy of Environmental Biology, India》2004,25(2):191-195
Samples of foliose lichen, Dirinaria consimillis (Fr.) Awasthi were transplanted at six residential sites of Lucknow city for monitoring the concentration of Cr, Zn, Pb, Cu and Cd metals at two vertical positions. The concentration of chromium and copper were more at the higher vertical position than the lower one. The maximum zinc was at lower vertical position than the upper one. Lead and cadmium were not detected in the present study. 相似文献
53.
Babu MS Gopal NV Reddy KP 《Journal of environmental biology / Academy of Environmental Biology, India》2007,28(1):21-27
This study reports the effects of low level developmental Pb exposure on specific brain regions like hippocampus, cerebellum and cerebral hemispheres of antioxidant enzyme activities. Wistar dams were exposed to 50 ppm, 100 ppm and 500 ppm of Pb acetate in drinking water during pregnancy and lactation (gestation day 6 through PND 21 (post natal day) and activities of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) and glutathione reductase (GR) were determined in the hippocampus, cerebellum and cerebral hemispheres of pups during treatment period (PND 7, 14, and 21 days) and also during withdrawl period (PND 35, 45, 60 and 90 days). During treatment period, SOD activity significantly (p < 0.05) decreased in all regions of all the treated groups with maximum decrease in 500 ppm treated group of 21 days, while GSH-Px and GR activities increased with maximum increase in 21 days aged 500 ppm group. During withdrawl period, the activities of all enzymes were significantly (p < 0.05) reversed. Thus the perinatal exposure of dams to variable dosages of low level lead results in characteristic neurochemical alterations in rat brain regions due to impaired antioxidants function. 相似文献
54.
Williams GP Babu S Ravikumar S Kathiresan K Prathap SA Chinnapparaj S Marian MP Alikhan SL 《Journal of environmental biology / Academy of Environmental Biology, India》2007,28(4):789-793
Associated bacteria from Stichodactyla haddoni are found maximum in tentacle tissues than the body tissue. There are eight associated bacterial species viz., Alcaligenes sp, Corynebacterium sp, Aeromonas sp, Sporosarcina sp, Renibacterium sp, Camobacterium sp1, Camobacterium sp2 and Salinococcus sp were recorded. The culture extracts from the associated bacterial species showed sensitivity against human bacterial and fungalpathogens. However, the hexane tissue extract of sea anemone showed maximum sensitivity (24 mm dia.) against the fish bacterial pathogen Aeromonas hydrophila than the other chosen pathogens. Comparatively the tissue extracts showed promising antimicrobial sensitivity than the cell free extracts of associated bacteria, and hence, the tissue samples from the sea anemone Stichodactyla haddoni is recommended for further exploration of novel antimicrobial drugs than the associated bacteria. 相似文献
55.
Sireesh Babu Maddinedi Badal Kumar Mandal Nawaz Khan Fazlur-Rahman 《Environmental Chemistry Letters》2017,15(3):467-474
There is a demand for the development of environmental friendly methods for the synthesis of graphene composites. Reduced graphene oxide/silver (RGO/Ag) nanocomposites are very good catalysts. Here, we propose a simple, green method for the synthesis of RGO/Ag nanocomposite using the amino acid tyrosine as bioreductant and stabilizing agent. RGO/Ag nanocomposite was characterized by using various analytical techniques and studied for its catalytic degradation of 4-nitrophenol. Results of attenuated total reflectance Fourier transform infrared spectroscopy and Zeta potential at ?55 mV reveal the surface capping of tyrosine onto the reduced graphene oxide nanosheets. RGO/Ag nanocomposites show excellent catalytic reduction of 4-nitrophenol with NaBH4, when compared to actual individual silver nanoparticles. 相似文献
56.
Kaushik Himanshu Ranjan Rashmi Ahmad Rakhshan Kumar Alok Prashant Kumar Nitish Ranjan Rajesh Kumar 《Environmental science and pollution research international》2021,28(15):18686-18701
Environmental Science and Pollution Research - The concentration of trace metals Mn, Pb, Ni, Zn, and Cu in the core sediment from Kabar Tal wetland was analyzed to understand the level of... 相似文献
57.
Kumar Rajesh Kamakshi Kumar Manoj Awasthi Kamlendra 《Environmental science and pollution research international》2021,28(34):46404-46413
Environmental Science and Pollution Research - For hydrogen-based energy systems development, purified hydrogen (H2) is a basic requirement and it can be achieved by using the H2-selective... 相似文献
58.
Jayshri A. Thote Ravikrishna V. Chatti Kartik S. Iyer Vivek Kumar Arti N. Valechh Nitin K. Labhsetwar Rajesh B. Biniwale M. K. N. Yenkie Sadhana S. Rayalu 《环境科学学报(英文版)》2012,24(11):1979-1984
N-doped mesoporous alumina has been synthesized using chitosan as the biopolymer template. The adsorbent has been thoroughly investigated for the adsorption of CO2 from a simulated flue gas stream (15% CO2 balanced with N2) and compared with commercially available mesoporous alumina procured from SASOL, Germany. CO2 adsorption was studied under different conditions of pre-treatment and adsorption temperature, inlet CO2 concentration and in the presence of oxygen and moisture. The adsorption capacity was determined to be 29.4 mg CO2/g of adsorbent at 55℃. This value was observed to be 4 times higher in comparison to that of commercial mesoporous alumina at a temperature of 55℃. Basicity of alumina surface coupled with the presence of nitrogen in template in synthesized sample is responsible for this enhanced CO2 adsorption. Adsorption capacity for CO2 was retained in the presence of oxygen; however moisture had a deteriorating effect on the adsorption capacity reducing it to nearly half the value. 相似文献
59.
Bhatia Saurabh Al-Harrasi Ahmed Behl Tapan Anwer Md. Khalid Ahmed Mohammed Muqtader Mittal Vineet Kaushik Deepak Chigurupati Sridevi Kabir Md. Tanvir Sharma Pritam Babu Chaugule Bhupal Vargas-de-la-Cruz Celia 《Environmental science and pollution research international》2022,29(10):14380-14392
Environmental Science and Pollution Research - Several studies have suggested the direct relationship between skin complications, air pollution, and UV irradiation. UVB radiations cause various... 相似文献
60.
Aullybux Aadil Ahmad Puchooa Daneshwar Bahorun Theeshan Jeewon Rajesh Wen Xuesong Matin Poona 《Journal of Polymers and the Environment》2022,30(4):1462-1477
Journal of Polymers and the Environment - Extracellular polysaccharides (EPS) of microbial origin are polymers with great potential for research and industrial applications. In this study, a... 相似文献