Microbial degradation of pyridine using Pseudomonas sp. and isolation of plasmid responsible for degradation

Pseudomonas (PI2) capable of degrading pyridine was isolated from the mixed population of the activated sludge unit which was being used for treating complex effluents, the strain was characterized. Aerobic degradation of pyridine was studied with the isolated strain and the growth parameters were evaluated. Pyridine degradation was further conformed by chromatography (HPLC) analysis. The process parameters like biomass growth and dissolved oxygen consumption were monitored during pyridine degradation. In order to conform with the plasmid capability to degrade pyridine, the requisite plasmid was isolated and transferred to DH 5alpha Escherichia coli. The subsequent biodegradation studies revealed the ability of the transformed plasmid capability to degrade the pyridine.     

GIS BASED LONG TERM HYDROLOGIC IMPACT EVALUATION FOR WATERSHED URBANIZATION1

ABSTRACT: To adequately manage impacts of ongoing or future land use changes in a watershed, the magnitude of their hydrologic impacts needs to be assessed. A grid based daily streamflow model was calibrated with two years of observed streamflow data, using time periods when land use data are available and verified by comparison of model predictions with observed streamflow data. Streamflow data were separated into direct runoff and baseflow to estimate the impacts of urbanization on each hydrologic component. Analysis of the ratio between direct runoff and total runoff from 30 years of simulation results and the change in these ratios with urbanization shows that estimated annual direct runoff increased from 49.2 percent (1973) to 63.1 percent (1984) and 65.0 percent (1991), indicating the effects of urbanization are greater on direct runoff than on total runoff. The direct runoff ratio also varies with annual rainfall, with dry year ratios larger than those for wet years. This suggests that the impact of urbanization on areas that are sensitive to runoff ratios, such as stream ecosystems, might be more serious during drier years than in wetter years in terms of water quality and water yield. This indicates that sustainable base‐flow is important to maintaining sound stream ecosystems.     

Evolving policies for conservation: An Historical Profile of the Protected Area System of Nepal

Nepal has instituted progressive conservation programmes since the 1970s. This move was in reaction to very rapid rates of land clearance in the lowland areas of the country and an opening up to the world that led to nature-based tourism as a major economic enterprise. Formal conservation began with the passage of national legislation in 1973 offering strong protection for national parks and wildlife reserves, but denied usufruct rights to rural communities. From the late 1970s to the 1990s, the legislation was amended several times. Each case was, in several fundamental ways, a loosening of control by government authorities. Nepal now has buffer zone legislation and allows for the designation of conservation areas in addition to the more-strictly defined categories. Beginning in the 1990s, both government and foreign-backed projects have been implementing landscape level conservation approaches; a number of initiatives in trans-boundary protected area management with India and China have also begun and non-governmental organizations have taken an increasingly active role. This paper considers the expansion of the protected areas network in light of historical, cultural and economic factors and concludes that Nepal has been reactive in adopting conservation programmes. Both outside and inside influences have strongly affected the development of conservation programmes and there are several areas in which more work needs to be done. This includes the need for implementing both national and international conservation law and adopting social and biological monitoring programmes in and around protected areas. In addition, factors outside the control of conservation officials (i.e. a Maoist insurgency) have indirectly hindered conservation programmes in recent years and have greatly complicated prospects for further success.     

Macroalgal release of dissolved organic carbon in coral reef and its interaction with the bacteria associated with the coral Porites lutea

Environmental Science and Pollution Research - Macroalgae supersede corals in the reefs worldwide, converting the coral-dominant systems into algal-dominant ones. Dissolved organic carbon (DOC)...     

Occurrence,transformation, bioaccumulation,risk and analysis of pharmaceutical and personal care products from wastewater: a review

Almost all aspects of society from food security to disease control and prevention have benefited from pharmaceutical and personal care products, yet these products are a major source of contamination that ends up in wastewater and ecosystems. This issue has been sharply accentuated during the coronavirus disease pandemic 2019 (COVID-19) due to the higher use of disinfectants and other products. Here we review pharmaceutical and personal care products with focus on their occurrence in the environment, detection, risk, and removal.

     

Health impact assessment of auto rickshaw and cab drivers due to exposure to vehicular pollution in Delhi: an integrated approach

Environmental Science and Pollution Research - Vehicular emission is an important contributor to air pollution in the urban environment and impacts the health of commuters as well as drivers. The...     

Conductive and convective heat transfer augmentation in flat plate solar collector from energy,economic and environmental perspectives — a comprehensive review

Environmental Science and Pollution Research - The primary objective of the paper is to identify the effective way to enhance the conductive and convective heat transfer of the FPSC. The...