Table 2 - uploaded by Dr. Aparajita Majumder
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Morphology and biochemical characteristics of the bacterial strain
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Arsenic (As) is one of the most toxic pollutants in the environment. Continuous use of contaminated ground
water for irrigation made the soil secondary source of As. Present study was aimed to investigate if bacteria
present in contaminated soil can convert immobilized arsenate (AsV) to mobile arsenite (AsIII) and having a
potential role to increas...
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Context 1
... genes and enzymes involved in arsenic reduction were described by Silver and Phung, 2005. Biochemical (Table 2) and morphological (Fig. 3) characterization of these five isolates were observed. Molecular characterization of the arsenate reducing isolates studied herein would provide much more detailed information about the phylogenetic affirmation of the isolates. ...
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Citations
... DS4(99%). Arsenic resistant bacteria have also been isolated from As contaminated soil by several researchers ( Yang et al., 2012, Majumder, 2012and Selvi et al., 2014. During the present investigation it was observed that all isolates could grow and withstand the sodium-arsenate toxicity up to 40mM under aerobic condition. ...
Arsenic contamination in soil is a serious problem in Bangladesh. The soil bacteria which are resistant
to arsenic can play an important role in reduction of arsenic toxicity of soil. Hence, the aim of the study was
to isolate arsenic resistant bacteria from arsenic contaminated soil. A total of three arsenic resistant bacteria viz.
PB1, PB2 and PB3 were isolated from the suspension of arsenic contaminated soil inoculated in Basal salt media
with 40 mM sodium-arsenate at 37°C under aerobic condition. The optimum growth of PB1 and PB2 were observed
at 37°C while PB3 showed maximum growth at 30°C. PB2 and PB3 showed optimum growth at pH 9 while the maximum
growth of PB1 was observed at pH 7. The MIC results showed that PB1, PB2 and PB3 were resistant up to
8mM and 16mM As(III) respectively. However, the all isolates showed resistance up to 256mM As(V). Analysis of
16S rRNA gene sequences revealed that isolate PB1, PB2 and PB3 were similar to Agrobacterium sp. PAE1 (99%),
Brevibacillus borstelensis strain 1CK49 (99%) and Ochrobactrum sp. DS4 (99%) respectively.
... It is a steel-grey, brittle, crystalline (hexagonal, rhombic), semi metallic (metalloid) solid substance. As is one of the most toxic pollutants in the environment (Majumder, 2012). ...
A hydroponic experiment was conducted in Directorate of Research, B.C.K.V., Mohanpur to the study of changes during germination in chemical composition phytate phosphorus (P) and phytate of rice genotype (IET-4786) under arsenic toxicity. IET-4786 genotype was germinated for 2 to 6 days. Proximate content of phytate P and phytate were determined during germination. Phytate P and phytate decreased continuously from 2 to 6 days. Phytate P and phytate degradation decreased significantly with increase in germination time. Germination resulted in a decrease in total Phytate P and phytate degradation with correspondingly marked increase in As-V and As-III toxicity. As-III was highly toxic for reducing the degradation of Phytate P and phytate content of rice seed. In order to obtain rice seed with high phytase activity for Phytate P and phytate degradation up to 4 days, after 4 days phytase activity reduced for degradation of phytate P and phytate.
The Soil inhabiting Lactobacillus is readily isolated and characterized on the basis of the biochemical and molecular
study. It has been found that this strain is also exhibited tolerance against Arsenic. It can grow at high concentrations of
arsenite (AsIII) ranging from 2 ppm to 20 ppm (part per million). The positive silver nitrate (AgNo3) has revealed
the oxidizing capacity of strain. No extra band of protein in either stressed or non-stressed condition was noticed in
protein profiling. We noticed Maximum tolerance concentration (MTC)s of this bacterium is 20 ppm. This strain
is also resistant to antibiotics Streptomycin and Nalidixic acid. The strain was identified as Lactobacillus
rhamnosus (MTCC 10093) (NCBI Gene Bank Accession No: KT982211). Its arsenic oxidizing capacity could be
exploited for bioremediation of arsenic in the agricultural fields.
