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111.
Mohanan Parayanthala Valappil Sangeetha Vijayan Sabareeswaran Arumugham Muraleedharan Vayalappil Jithin Krishnan Vandana Unnikrishnan Varsha Sheela Bhasi 《Environmental science and pollution research international》2021,28(47):66602-66612
Environmental Science and Pollution Research - Hydrogen peroxide (H2O2) is a reactive chemical used in a wide range of applications. Most importantly, it is used for sterilization process in health... 相似文献
112.
Khandaker Rayhan Mahbu Kannan Krishnan Ravi NaiduMallavarapu Megharaj 《环境科学学报(英文版)》2017,29(1):128-137
A mercury resistant bacterial strain SE2 was isolated from contaminated soil.The 16 s rRNA gene sequencing confirms the strain as Sphingopyxis belongs to the Sphingomonadaceae family of the α-Proteobacteria group.The isolate showed high resistance to mercury with estimated concentrations of Hg that caused 50%reduction in growth(EC_(50)) of 5.97 and 6.22 mg/L and minimum inhibitory concentrations(MICs) of 32.19 and 34.95 mg/L in minimal and rich media,respectively.The qualitative detection of volatilized mercury and the presence of mercuric reductase enzyme proved that the strain SE2 can potentially remediate mercury.ICP-QQQ-MS analysis of the remaining mercury in experimental broths indicated that a maximum of 44%mercury was volatilized within 6 hr by live SE2 culture.Furthermore a small quantity(23%) of mercury was accumulated in live cell pellets.While no volatilization was caused by dead cells,sorption of mercury was confirmed.The mercuric reductase gene merA was amplified and sequenced.Homology was observed among the amino acid sequences of mercuric reductase enzyme of different organisms from a-Proteobacteria and ascomycota groups, 相似文献
113.
114.
R. Rajesh Kannan M. Rajasimman N. Rajamohan B. Sivaprakash 《Frontiers of Environmental Science & Engineering in China》2010,4(1):116-122
In this study, the biosorption of Malachite green (MG) onto Turbinaria conoides, brown marine algae, was studied with respect
to initial pH, temperature, initial dye concentration, and sorbent dosage. The optimum initial pH and temperature values for
MG removal were found to be 8.0 and 30°C, respectively. Sorbent dosage was found to strongly influence the removal of MG.
Equilibrium studies were carried out to test the validity of the Langmuir (q
max = 66.6 mg/g and b = 0.526 mL mol/L) and the Freundlich (n = 1.826 and K = 3.751 mg/g) isotherms. The kinetic studies indicated the validity of the pseudo first-order and second-order equation. 相似文献
115.
S. Krishnan 《Marine Biology》1968,2(1):54-65
Histochemical observations were made of seasonal changes of protein, carbohydrates, lipids and nucleic acids in different tissues of Holothuria scabra. Accumulation of organic components in the gonads were observed with the advance of maturity. Protein and lipids were found to be important as storage materials for utilization during development. A sexcorrelated variation of nucleic acids was evident in the gonads. Intestinal protein and lipids were found to be utilized by the gonads during the reproductive cycle; carbohydrates seemed to be of lesser importance. 相似文献
116.
An analysis of the drivers affecting the implementation of green supply chain management 总被引:5,自引:0,他引:5
Green supply chain management has emerged as an important organizational philosophy to reduce environmental risks. We develop a model of the drivers affecting the implementation of green supply chain management using an Interpretive Structural Modeling (ISM) framework. The various drivers of green supply chain management (GSCM) are identified based on the GSM literature and on consultations with experts in the industry. The model developed is validated on a case study involving a manufacturing firm in southern India. 相似文献
117.
Characterization of trace organic contaminants in marine sediment from Yeongil Bay, Korea: 1. Instrumental analyses 总被引:1,自引:0,他引:1
Koh CH Khim JS Villeneuve DL Kannan K Giesy JP 《Environmental pollution (Barking, Essex : 1987)》2006,142(1):39-47
Concentrations of polychlorinated biphenyls (PCBs), organochlorine (OC) pesticides (HCB, HCHs, CHLs, and DDTs), polycyclic aromatic hydrocarbons (PAHs), alkylphenols (APs), and bisphenol A (BPA) were measured in 26 marine sediments collected from Yeongil Bay, Korea, in order to characterize their spatial distribution and sources. PCBs (2.85-26.5 ng/g, dry wt.) were detected mainly in the inner bay locations Mean OC pesticide ranged from 1.16 ng/g dry wt. for HCH to 0.05 ng/g dry wt. for HCB). PAH concentrations ranged from <10.0 to 1870 (mean: 309)ng/g dry wt., and were predominated 3- and 4-ring congeners. Concentrations of APs, such as nonylphenol, octylphenol, butylphenol (means 89.1, 4.61, 11.0 ng/g dry wt., respectively), were greater at locations proximal to municipal wastewater discharges. Concentrations of PCBs and PAHs were great near shipyards and industrial complexes. Vertical profiles of PAHs and APs indicated that they have been associated with sediments since the 1950s. 相似文献
118.
Kannan N White SM Worrall F Whelan MJ 《Journal of environmental science and health. Part. B》2006,41(7):1049-1070
Pesticides in stream flow from the 142 ha Colworth catchment in Bedfordshire, UK were monitored from October 1999 to December 2000. About 47% of the catchment is tile-drained and different pesticides and cropping patterns have recently been evaluated in terms of their effect on nutrient and pesticide losses to the stream. The data from Colworth were used to test soil and water assessment tool (SWAT) 2000 predictions of pesticide concentrations at the catchment outlet. A sound model set-up to carry out pesticide modelling was created by means of hydrological modelling with proper simulation of crop growth and evapotranspiration. The pesticides terbuthylazine, terbutryn, cyanazine and bentazone were modelled. There was close agreement between SWAT-predicted pesticide concentration values and observations. Scenario trials were conducted to explore management options for reducing pesticide loads arriving at the catchment outlet. The results obtained indicate that SWAT can be used as a tool to understand pesticide behavior at the catchment scale. 相似文献
119.
Water quality and phytoplankton characteristics in the Palk Bay, southeast coast of India 总被引:1,自引:0,他引:1
Sridhar R Thangaradjou T Kumar SS Kannan L 《Journal of environmental biology / Academy of Environmental Biology, India》2006,27(3):561-566
The present study was carried out to determine the water quality in terms of physicochemical characteristics and plankton distribution in the coastal waters of Kattumavadi, Palk Bay for a period of one year from April 2002 to March 2003. Air and surface water temperatures varied from 28 degrees C to 32.50 degrees C and from 27.5 to 32.0 degrees C while light extinction coefficient (LEC) varied between 0.95 and 1.85. Salinity ranged from 26.0 to 34.5 per thousand and the pH ranged between 7.95 and 8.35. Variation in dissolved oxygen content was from 4.15 to 7.18 ml(-1), and the particulate organic carbon (POC) content varied between 0.49 and 2.28 mgCl(-1). Concentrations of nutrients viz. nitrate (2.15 to 8.28 microM), nitrite (0.12 to 0.62 microM), inorganic phosphate (1.28 to 2.15 microM) and reactive silicate (5.15 to 12.52 microM) also varied independently. Chlorophyll a content ranged from 0.28 to 1.48 mg m(-3) and the primary productivity, from 4.19 to 16.08 mgCm(-3) hr(-1). The present study recorded a total of 43 species of planktonic diatoms and two species of blue-green algae. Population density of phytoplankton varied from 18,000 to 34,000 cells l(-1). Percentage composition, of the diatoms showed minimum values during the monsoon season and the maximum values during the premonsoon season. 相似文献
120.
Sasikumar C Kannan V Senthilkumar B 《Journal of environmental biology / Academy of Environmental Biology, India》2005,26(1):113-115
A study was made on the sources and spread of Salmonella spp at Namakkal District, Tamilnadu, to ascertain positive carriers of the pathogen. Of the 150 samples collected from varied sources, food handlers significantly contributed to the spread of S. typhi, S. paratyphi A and B, the presence of which was ascertained by standard confirmatory tests. It is inferred that a periodic assay of Salmonella spp in food stuff and food handlers can help in the control of food borne disease. 相似文献