Impact of heavy metal contamination of Bellandur Lake on soil and cultivated vegetation

The aim of this study is to assess the extent of heavy metal contamination of vegetation due to irrigation with sewage-fed lake water on agricultural land. Samples of water, soil and crop plants have been analysed for seven heavy metals, viz. Fe, Zn, Cu, Ni, Cr, Pb and Cd using atomic absorption spectrophotometry. The results show the presence of some of the heavy metals in rice and vegetables, beyond the limits of Indian standards. Metal transfer factors from soil to vegetation are found significant for Zn, Cu, Pb and Cd. Comparing the results of heavy metals in water, soil and vegetation with their respective natural levels, it is observed that impact of lake water on vegetation was found to be more than the soil

Heavy metals content in water, water hyacinth and sediments of Lalbagh tank, Bangalore (India)

The present study was undertaken for assessing the level of heavy metals such as iron, zinc, copper, nickel, chromium, lead and cadmium in water, water hyacinth and sediment samples of Lalbagh tank, Bangalore. Metals were detected using flame atomic absorption spectrophotometry. The results revealed that by and large all metals are present in all the samples, except cadmium in the sediment samples. The average concentrations of iron in water and sediment samples, and lead in water hyacinth were found exceeding the limits of Indian Standards. In general, the concentrations of iron and zinc were found more, followed by lead, chromium, copper, nickel and cadmium cancentration was low. Bioaccumulation factor for water hyacinth was found maximum for chromium. Geoaccumulation index results revealed that there is moderate input of copper and lead from anthropogenic sources to the tank basin

Effects of heavy metal contamination from anthropogenic sources on Dasarahalli tank, India

This study examines the concentrations of various heavy metals, and their distribution in a hyper-eutrophic urban Dasarahalli tank system, which is being polluted from industrial, domestic and sewage effluents. The concentration of iron (Fe), zinc (Zn), copper (Cu), nickel (Ni), chromium (Cr), lead (Pb) and cadmium (Cd) in water, plant (Alternanthera philoxeroides) and sediment samples was determined. The water-soluble (bioavailable) fractions of heavy metals correlated positively with their total concentration, exhibiting the following sequence of bioavailability: Zn > Cd > Ni > Fe > Cu > Pb > Cr. A. philoxeroides exhibited a maximum bioaccumulation factor for cadmium (3913). The mean values of all types of collected samples were correlated with the corresponding mean values in a control tank (Vasanthapura tank). The sequence of the order of the concentrations of the metals in water, plant and sediment samples exhibiting higher values than those observed in the control tank was as follows: Cr > Ni > Pb > Cu > Fe > Zn,Cd > Cr > Fe â Zn Cu â Pb and Pb > Cu â Cr > Zn â Ni > Fe, respectively. The geoaccumulation indices of the heavy metals revealed that the tank is moderately contaminated. As A. philoxeroides is extensively used for human consumption and also as cattle fodder, there is a growing health risk that these metals could find their way into the human food chain. © 2007 The AuthorsJournal compilation © 2007 Blackwell Publishing Asia Pty Ltd

Design, synthesis of novel furan appended benzothiazepine derivatives and in vitro biological evaluation as potent VRV-PL-8a and H+/K+ ATPase inhibitors

A series of new of furan derivatised 1,4 benzothiazepine analogues were synthesized starting from 1-(furan-2-yl)ethanone. 1-(Furan-2-yl)ethanone was converted into chalcones by its reaction with various aromatic aldehydes, then were reacted with 2-aminobenzenethiol in acidic conditions to obtain the title compounds in good yields. The synthesized new compounds were characterized by 1H NMR, 13C NMR, Mass spectral studies and elemental analyses. All the new compounds were evaluated for their in vitro VRV-PL-8a and H+/K+ ATPase inhibitor properties. Preliminary studies revealed that, some molecules amongst the designed series showed promising VRV-PL-8a and H+/K+ ATPase inhibitor properties. Further, rigid body docking studies were performed to understand possible docking sites of the molecules on the target proteins and the mode of binding. This finding presents a promising series of lead molecules that can serve as prototypes for the treatment of inflammatory related disorder that can mitigate the ulcer inducing side effect shown by other NSAIDs