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71.
Shikha Raghuwanshi Tithi Agarwal Amit Yadav MGH Zaidi Yogesh Shouche Reeta Goel 《Chemistry and Ecology》2016,32(6):583-597
Bacterial strains with poly-3-hydroxybutyrate (PHB) degradation potential were isolated from waste yard soil samples of selected industrial sites in Uttarakhand, India, and two microbial consortia were developed, i.e. Consortium I comprises Pseudomonas sp. strain Rb10, Pseudomonas sp. strain Rb11 and Bacillus sp. strain Rb18, and Consortium II is composed of Lysinibacillus sp. strain Rb1, Pseudomonas sp. strain Rb13 and Pseudomonas sp. strain Rb19. The current study involved enrichment selection via liquid and semi-solid media, followed by isolation and screening of bacterial strains using PHB pellets and films. Furthermore, the identification and characterisation was done by triphasic approach. The utilisation of PHB by the characterised strains was confirmed by Fourier transform infrared spectroscopy and scanning electron microscopy. Moreover, the minimum inhibitory concentration of solubilised PHB was found to be 2.5?mg/mL, which was detected through ‘clear zone assay’. Further, the selection and biocompatibility testing of potential isolates were performed for the formation of bacterial consortia. Thus, the present work would provide direct and standardised protocol for screening and selection of potential microbiomes for biodegradation of polymers by overcoming the negative effect of organic solvents. Moreover, indigenously developed consortia would be evaluated for their in situ biodegradation potential against various bioplastic films. 相似文献
72.
Visibility impairing aerosols in the urban atmosphere of Delhi 总被引:1,自引:0,他引:1
Singh T Khillare PS Shridhar V Agarwal T 《Environmental monitoring and assessment》2008,141(1-3):67-77
To study the visual air quality of Delhi, size fractionated aerosols – coarse and fine fractions of PM10 – were collected and analysed for and EC at three sites with different background activities. The analysed species constitute a smaller portion of coarse fraction
(39%) but a larger portion of fine fraction (69%). The sampling was performed from June 2003 to November 2003 which covers
monsoon and post monsoon seasons.Aerosol data was used to describe the spatial variation of Visibility Range as a function
of chemical composition of visibility impairing aerosols. During the study period, visibility was found to be poor varying
between 4.7 and 13 km with an average value of 9.4 km. It is observed that visibility impairment was more due to carbonaceous
aerosol followed by sulphate. 相似文献
73.
Dynamics of toxic heavy metals in different compartments of a highly urbanized closed aquatic system
This paper deals with the dynamics of chromium, nickel, copper and lead among the different components namely water, surface sediments, submerged and free floating macrophytes and fish of the twin manmade lakes, Upper and Lower lakes, of Bhopal (M.P., India). Some basic parameters of water and sediment have also been studied. The basin of the lake system is densely populated and the water is used for various purposes including drinking. Ni and Pb along with nitrate in both lakes are significantly higher than the drinking water quality criteria of USEPA. The concentration of the metals in the sediments is noticeably higher than that present in the adjoining rock, particularly Ni and Pb. There is a significant uptake of metals by the macrophytes (Eichhornia crassipes and Hydrilla verticillata) and fish (Labeo rohita and Oreochromis niloticus) mainly in summer. The fish of Lower lake (O. niloticus) is unfit for human consumption. The data have been statistically treated. Principle component analysis and cluster analysis were performed to define the origin of metals and to assess the relationship among the sites. Overall the Lower lake is more polluted than the Upper lake. In aggregate, the lake system is under an environmental stress due to certain practices. 相似文献
74.
Chavda Vivek P. Sonak Shreya S. Munshi Nafesa K. Dhamade Pooja N. 《Environmental science and pollution research international》2022,29(42):62887-62912
Environmental Science and Pollution Research - As of now, the COVID-19 pandemic has become uncontrolled and is spreading widely throughout the world. Additionally, new variants of the mutated viral... 相似文献
75.
Yu Xiao Tao Liu Chunyuan Gu Jinghui Yu Manjree Agarwal 《Journal of environmental science and health. Part. B》2019,54(1):41-48
Fumigation is required to protect cottonseed in storage and pre-shipment from insect pests and/or microorganisms. Fumigation of cottonseed with carbon disulphide (CS2), carbonyl sulphide (COS), ethanedinitrile (C2N2), ethyl formate (EF), methyl bromide (MB) and phosphine (PH3) showed that >85% of the fumigants disappeared within 5?h of exposure. COS maintained >20?mg L–1 for 24?h. After 1?day of aeration, 75%–85% of the absorbed COS and MB and 20%–40% of the absorbed CS2, EF and PH3 were released from treated cottonseed. The fumigant residues were reduced by 80% for COS, 50% for EF or MB and 25% for CS2 after 1?day of aeration. After 13?days of aeration, fumigant residues were reduced by 95% for MB, 65% for EF, 55% for CS2 and to natural levels in the COS residue. Carbon disulphide, COS, PH3, EF and C2N2 had no effect on the germination of cottonseed, but germination was reduced to 50% by MB. COS has potential as a fumigant for control of insect pests in cottonseed because it dissipates quickly and does not negatively impact germination. On the other hand, MB appears to strongly absorb and requires an extended period for residues to dissipate, and it negatively impacts germination. 相似文献
76.
Kumar Ankur Singh Prakhar Agarwal Tarun Joshi Manish Semwal Poonam Singh Kuldeep Pathak Parmanad Prakash Ramola Rakesh Chand 《Environmental science and pollution research international》2020,27(32):40229-40243
Environmental Science and Pollution Research - Regional averages of radon, thoron, and associated decay product concentration are reported to be higher than their respective global averages in... 相似文献
77.
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79.
The maximum likelihood (ML) method for regression analyzes of censored data (below detection limit) for nonlinear models is presented. The proposed ML method has been translated into an equivalent least squares method (ML-LS). A two stage iterative algorithm is proposed to estimate statistical parameters from the derived least squares translation. The developed algorithm is applied to a nonlinear model for prediction of ambient air CO concentration in terms of concentrations of respirable particulate matter (RSPM) and NO2. It has been shown that if censored data are ignored or estimated through simplifications such as (i) censored data are equal to detection limit, (ii) censored data are half of the difference between detection limit and lower limit (e.g., zero or background level) or (iii) censored data are equal to lower limit, this can cause significant bias in estimated parameters. The developed ML-LS method provided better estimates of parameters than any of the simplifications in censored data. 相似文献
80.