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International Journal of Scientific Research in Environmental Sciences, 4(1), pp. 0001-0011, 2016
Available online at http://www.ijsrpub.com/ijsres
ISSN: 2322-4983; ©2016; Author(s) retain the copyright of this article
http://dx.doi.org/10.12983/ijsres-2016-p0001-0011
1
Full Length Research Paper
Isolation and Characterization of Arsenite Tolerant Bacterial Strains from
Contaminated Water of West Bengal, India
Sabyasachi Chatterjee1*, Yogesh Bhai Patel1, Sajjan Rajpoot1, Sonam Rani1, Naba Kumar Mondal2*
1Department of Biotechnology, The University of Burdwan, Burdwan, West Bengal, India
2Department of Environmental Science, The University of Burdwan, Burdwan, West Bengal, India
*Corresponding author: [email protected], [email protected]; Cell: +919434545694, Fax: (0342) 2634200
Received 22 November 2015; Accepted 24 January 2016
Abstract. Arsenic contamination in groundwater of West Bengal, India is a serious environmental issue which is likely cause
diseases to the population dwelling in those areas. However, many studies shown that microorganisms have developed some
mechanism to resist themselves from arsenic compound. The objective of this study was to isolate arsenite resistant bacterial
strains from arsenic contaminated groundwater collected from West Bengal and to find the arsenic bioremediation efficiency
of most effective isolated strains. We cultured, identified and characterized two arsenite resistant bacterial strains (named as
ADSY K and ADSY R). Isolates were subjected for various biochemical test, co-resistant test with other heavy metals and
growth pattern observed in different growth parameters. These strains were closely related to various species of Bacillus and
Pseudomonas based on their 16S rRNA gene sequences and phylogenetic tree. Extracellular protein (soluble protein) profiling
through SDS-PAGE shown up and down regulation in presence of arsenite. Total arsenite estimation was done in different cell
extract as a bioremediation approach. The bacterial isolates (ADSY K and ADSY R) can be exploited for bioremediation of
arsenic containing wastes.
Keywords: Arsenite, Groundwater, Bacteria, Bioremediation, 16S rRNA gene sequence, Phylogenetic tree
1. INTRODUCTION
Exposure to heavy metals such as lead, cadmium,
mercury and arsenic is a major health hazard (Selvi et
al., 2014). Among these, arsenic (As) is a well known
human carcinogen and it is widely distributed in food,
water, soils, and air (Liao et al., 2011). It is a
ubiquitous element of both natural and anthropogenic
origin and is often responsible for contaminating
water supplies. However, Arsenic contamination is
most severe and unprecedented across a 0.173 million
square kilometer-geographical region in West Bengal,
India, where 36 million people are at risk for As
exposure (BGS and DPHE, 2001). Arsenic is
frequently found in nature as trivalent arseniteAs(III)
and pentavalent arsenate As(V) . Although both
As(III) and As(V) are toxic, As(III) is relatively more
toxic than As(V) (Munawar et al., 2012). At present,
even though As-rich groundwater has not been used
for drinking, it is still extensively used for irrigation,
aquaculture and industrial purposes (Kar et al., 2013).
Agricultural soil acts as a principal sink of As through
irrigation of cropland, and most of the arsenical
residues have low solubility and low volatility,
generally accumulating in the top soil layers. Topsoil
thus contaminated with As may have influence on the
entry of As into the food chain (Das et al., 2013).
Acute exposure to high levels of inorganic arsenic by
humans can be fatal while acute exposure to lower
levels can result in vomiting, decreased production of
red and white blood cells, abnormal heart rhythm, and
damage to blood vessels (Selvi et al., 2014). Due to
its ability to induce chromosomal aberration during
DNA replication, As is considered as a human
carcinogen and a potential mutagenic agent (Wang et
al., 2001). Moreover, previous literature also
highlighted that arsenic can interferes with the DNA
repair system, signal transduction pathways and
inhibits many enzymatic activities and also damages
respiratory, digestive, and circulatory as well as
nervous system (Rehman et al., 2010).
Therefore, removal of arsenic from environment is
of great significance to local agriculture and the
population. There are many conventional methods
such as chemical precipitation, chemical oxidation or
reduction, ion exchange, filtration, electrochemical
treatment; reverse osmosis, membrane technologies
and evaporation recovery are available for removal of
heavy metals from industrial effluent. However, all
the above mentioned processes may be ineffective or
Chatterjee et al.
Isolation and Characterization of Arsenite Tolerant Bacterial Strains from Contaminated Water of West Bengal, India
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extremely expensive especially when the metals in
solution are in the higher range (1-100 mg/L).
Therefore, it is extremely important to develop an
innovative, low cost and eco-friendly method for
removal of toxic heavy metal ions from the water and
wastewater (Lou and Chin, 2008). A wide variety of
microorganisms are capable of growth in the presence
of heavy metal ions and tolerates high concentrations
(Gaballa and Helmann, 2003; Rehman et al., 2007).
Very recently Pal et al. (2014) reported one gram-
positive, nonpigmented, rod-shaped fluoride-tolerant
bacterial strain which tolerated more than 1500 ppm
of fluoride in brain-heart infusion agar medium.
However, arsenic resistant bacterial strain from West
Bengal is very rare in previous literature. Major
portion of West Bengal is arsenic affected. From this
back drop, present study was conducted to isolate and
characterize the arsenic tolerant bacterial strain from
arsenic contaminated water of West Bengal.
1. Materials and Methods
2.1 Site Description, Water Sampling and
Chemical Analysis
Water samples (0–15 cm) were collected from the
rice-growing areas of the Malda(Kaliachowk) and
Mushirdabad (Raghunathgang) Districts. The tubewell
water contaminated with arsenic and it exceed the
WHO permissible limits (0.01 mg/L). The
physicochemical properties of the groundwater
including pH (Jackson, 1967), conductivity, available
N (Subbiah and Asija, 1956), K (Brown and Warncke,
1934) and P (Olsen, 1954) were determined using
standard protocols. Total As (Sparks et al. 2006) and
NaHCO3-extractable As (Johnson and Barnard, 1979)
levels were determined using Spectrophotometer
(SDDC method).
2.2. Enrichment and Isolation of Arsenic Resistant
Bacteria
Samples were collected from arsenic prone area
[Raghunathganj, SAIL (Durgapur)] of west Bengal.
Special care was taken during sample collection. For
long term preservation, the samples were stored at
4°C. Serial dilution techniques were used for the
isolation of arsenic resistance bacteria. 10-3 dilution of
the sample was selected as inoculums. Different
concentrations of arsenic trioxide (0.1-10 mM) were
used to isolate arsenic resistant bacteria.
Approximately 108 isolates were found in the plate
containing 0.5mM arsenic trioxide after 48 hours of
incubation at 37°C. Among all, two dominant colonies
were further selected for future experimental analyses
and named as ADSY K,ADSY R respectively.
Arsenic-contaminated water (1 ml) was suspended in
Luria Bertani (LB) medium supplemented with 1 mM
of As(III) and incubated at 30°C for 48 hours
(Kinegam et al., 2008). Approximately 0.1mL of
enriched culture was plated on 1mM of As(III)
containing LB agar and incubated at 30°C for 24 hrs.
After incubation different colonies were formed on
the plates. Two dominant colonies were chosen for
further experimental analyses and named as ADSYK
and ADSYR.
2.3. Biochemical Analysis
The two dominant isolated colonies were subjected
for several biochemical analyses to characterize the
nature of the strains following “Bergey’s Manual of
Determinative Bacteriology”. The amylase test,
protease test, oxidase test, VP test, indole test and
catalase test were performed by using standard
protocols.
2.4. Scanning Electron Micrograph Study
Observation of ADSY R and ADSY R strain both in
arsenite treated and untreated condition was done
under Scanning Electron Microscope (SEM) at the
Centre of Scanning Electron Microscopy of Burdwan
University on HITACHI-S-530 operating at an
accelerating voltage of 20 kV.
2.5. Growth Parameters
2.5.1 Effect of Temperature on the Isolates
The isolated microorganisms were grown in LB broth
at different temperatures: 10℃, 20℃, 30℃, 37℃ and
40℃ for 24 hours on an orbital shaker at 120 rpm.
After incubation period, growth was monitored in
spectrophotometer (UV-Vis 1700 Pharmaspec,
Shimadzu) at 620 nm.
2.5.2. Effect of pH on the Isolates
The isolated microorganisms were grown in LB broth
at different pH: 5.0-8.0 for 24 hours at 37℃ on an
orbital shaker at 120 rpm. After incubation period,
growth was monitored in spectrophotometer (UV-Vis
1700 Pharmaspec, Shimadzu) at 620 nm.
International Journal of Scientific Research in Environmental Sciences, 4(1), pp. 0001-0011, 2016
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Fig. 1a: Phylogenetic tree for ADSYK
Fig. 1b: Phylogenetic tree for ADSY R
Fig. 1c: Virtual Restriction sites of 16S rDNA sequence of ADSY K strain
Chatterjee et al.
Isolation and Characterization of Arsenite Tolerant Bacterial Strains from Contaminated Water of West Bengal, India
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2.5.3. Effect of Osmotic Pressure on the Isolates
The isolated microorganisms were grown in LB broth
at different salt (NaCl) concentration: 1M, 2M, 3M,
4M and 5M for 24 hours at 370C on an orbital shaker
at 120 rpm. After incubation dry weight of biomass
was measured.
2.6. Co-resistance of Isolates
Co resistance property to the other heavy metals were
also checked by growing them in LB broth
supplemented with 0.1mM, 0.5mM and 1mM of lead
(Pb) and mercury (Hg) and incubated at 37˚C for 24
hours on an orbital shaker at 120 rpm. After
incubation dry weight of biomass was measured.
2.7. Agar Cup Assay Method for Antibiotic
Sensitivity
Agar cup assay was followed to determine the
antibiotic sensitivity of the isolates. Chloramphenicol,
ampicillin, and tetracycline at various concentrations
were added to the cups of the agar plate. Arsenic
resistant isolates were spread throughout the plate.
After 24 hours of incubation, zone of clearance was
measured.
Fig. 2: Agarose Gel Electrophoresis
2.8. Protein Extraction and Its Profiling by SDS-
PAGE
To compare the extracellular proteins expression in
the stressed i.e. Arsenite and normal condition
(control), proteins were extracted and SDS-PAGE was
done. For protein isolation, 48 hours incubated pure.
Cultures [ADSYR and ADSYK] respectively at 37°C,
30°C were used to harvest the cells at 5000 rpm for 10
minutes. The supernatant contains soluble proteins
which were then dialyzed and separated by Sodium
Dodecyl Sulfate-Poly-Acryl amide gel electrophoresis
(SDS-PAGE).
International Journal of Scientific Research in Environmental Sciences, 4(1), pp. 0001-0011, 2016
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Fig. 3: SDS-PAGE of extracellular protein of ADSY K and ADSY R
Table 1: Physical and Chemical Properties of Water Sample
Parameters Tested water quality WHO recommended
value
ISI recommended value
pH 7.68 ± 0.21 6.5 t0 8.5 6.5 to 8.5
Conductivity(S/cm) 740 ± 1.05 600 -
TSS (mg/L) 30.0 ± 0.41
TDS (mg/L) 205 ± 0.11 500 500
DO (mg/L) 6.10 ± 0.03
COD (mg/L) 2.11 ± 0.71 10.0 -
Nitrate (mg/L) 3.11 ± 0.31 40.0 45
Chloride (mg/L) 11.75 ± 0.19 250
Sodium (mg/L) 2.5 ± 0.11 200 200
Potassium (mg/L)
7.32 ± 0.01 50 50
Phosphate (mg/L) 1.72 ± 0.21 0.02
Arsenic (mg/L) 4.51 0.05 0.05
Iron (mg/L) 0.163 0.30 0.30
2.9. Genomic DNA Extraction and Sequencing
The genomic DNA were extracted by standard
method with some modifications (Pitcher et al. 1989)
and confirmed through 0.8% Agarose Gel
Electrophoresis. The extracted DNA samples were
used to amplify the 16S rRNA gene using Universal
primer (27F and 1492R) and Taq polymerase in PCR
(Thermo HBSP02220) and further sequencing was
done at Xcelris genomics (ABI 3730xl genetic
analyzer).
Chatterjee et al.
Isolation and Characterization of Arsenite Tolerant Bacterial Strains from Contaminated Water of West Bengal, India
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Table 2: Biochemical test of the isolated bacteria
Biochemical test reagents sample
ADSY R
sample
ADSY K
Amylase Test
Starch Agar, Gram’s iodine +ve +ve
Catalase Test 3% hydrogen peroxide +ve +ve
VP Test
MR-VP Broth, Baritt’s
reagent -ve -ve
Protease Test Gelatin agar medium -ve -ve
Indole Test
Tryptophan water, kovacs
reagent -ve -ve
Oxidase Test Glucose Tryptopan media -ve -ve
2.10. Bioinformatics Study
The 16S rRNA gene sequences were used for
determining the isolated strains and to draw the
phylogenetic tree of the isolated strain through
bioinformatics analysis. The sequences were also used
to find out the particular restriction sites by using
NEB cutter V2.0 (http://nc2.neb.com/NEBcutter2/).
For similar sequence search, standard nucleotide
BLAST (https://blast.ncbi.nlm.nih.gov) was
performed and few similar sequences with low “e
value” were selected for multiple sequence alignment
(MSA) by using the CLUSTAL W tool
(http://www.ebi.ac.uk/Tools/msa/clustalw2/ ). Ten
multiply aligned sequences were further used for
phylogenetic tree construction using the MEGA 6
tools.
2.11. Arsenic Estimation from the Cell Culture
For total arsenite concentration in the cell culture was
estimated spectrophotometrically using (SDDC)
method ((PERKINELMER, FTIR, Model-RX1
Spectrometer, USA). three different cell suspensions
were prepared for arsenic measurement which were
cell supernatant, cell wash and cell lysate. On the
other hand, total arsenic content in water sample was
measured spectrophotometrically using
Silverdiethyldithiocarbamate (SDDC) method
(PERKINELMER, FTIR, Model-RX1 Spectrometer,
USA).
2. RESULTS AND DISCUSSIONS
3.1. Water Physical and Chemical Properties
Water containing elevated concentration of metal is
potential source of those metal tolerant bacteria. It is
because the environmental condition promotes
adaptation of those isolates in such environment
(Clausen et al., 2000). The physicochemical
characterization of experimental water is shown in
Table 1. From the Table 1, it is shown that pH ranges
from 7.39 to 7.76 and conductivity varies between
0.72 to 0.75 S/cm, respectively. Conductivity of
water sample was found in the range of 655-789
S/cm, which is much higher than the WHO
standards. Electrical conductivity is considered to be a
rapid and good measure of dissolved solids.
Conductivity is an important criterion in determining
the suitability of water for irrigation. Chemical
oxygen demand is a valuable water quality parameter.
COD is a measure of the oxygen equivalent of the
organic matter in a water sample that is susceptible to
oxidation by a strong chemical oxidant, such as
dichromate. It is an index of organic content of water
because the most common substance oxidized by
dissolve oxygen in water is organic matter having
biological origin i.e. dead plant and animal wastes
(Singh, 2002). COD values convey the amount of
dissolved oxidisable organic matter including the non-
biodegradable matters present in it. The value of COD
was found in the range of 1.8 mg/l to 2.5 mg/l. Its
value is much lower than the permissible limit
International Journal of Scientific Research in Environmental Sciences, 4(1), pp. 0001-0011, 2016
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prescribed by WHO. However, other parameters such
as available phosphorus, nitrogen, sodium, potassium,
chloride, TSS, TDS, and DO clearly revealed that the
water is moderate quality. The results of the study
revealed that all bacterial isolates did not have the
same degree of tolerance to As toxicity. This might be
due to developing of As tolerance and resistant ability
of the inherent individual soil microorganisms (Smith
et al., 1998). Exposure of indigenous bacteria to
gradient of As concentrations during enrichment for
isolation might have developed metal resistance
systems for protecting sensitive cellular components
(Pattamaporn et al., 2008).
Fig. 4: Scanning Electron Micrograph of isolated bacteria
3.2. Biochemical Analysis and Co-Resistant
Activity of Isolated Bacteria
From the various biochemical analyses it was found
that the isolated strain ADSYR and ADSYK showed
positive results for catalase test but negative for
protease and oxidase test (Table 2). Optimum
temperature has been found at 37˚C for ADSYR and
30˚C for ADSYK whereas optimum pH was found to
be 6.0 and 8.0 for ADSYR and ADSYK, respectively.
Both the isolates ADSY R and ADSY K were also
found co-resistant in lead (Pb) and mercury (Hg) in all
the tested concentrations (Table 3).
3.3. SEM Study of Isolated Bacteria
From the SEM study, it has been observed that the
ADSY bacterial samples are rod shaped bacterium
and their cell size increased when they were grown in
presence of arsenite (Fig. 4a & Fig-4b).Enlargement
of the cell size may have ultimately lead to bursting of
the cell because of variation in osmotic pressure
between the cytosol and the outer environment. It had
been reported earlier that SEM analysis of
Pseudomonas aeruginosa strain MCCB 102 showed
an increase in cell size due to Cd and lead
accumulation in the cell wall and along the external
cell surfaces (Zolgharnein et al., 2010). The effect of
metal on cell morphology was also demonstrated by
transmission electron microscopy analysis of
P. putida strain 62BN which showed an increase in
size of the cells grown in the presence of Cd and also
showed intracellular and periplasmic accumulation of
metal in the cells (Rani et al., 2009).
3.4. Genomic and Proteomic Study
Genomic study has revealed that the presence of high
molecular weight genomic DNA (Approx. 23kb) (Fig.
2) in ADSY R and ADSY K. But proteomic study of
ADSY R and ADSY K confirmed the phenomenon of
time specific regulation of protein expression. From
figure 3, it can be observed that some of genes
became up regulated in stress condition (As treatment)
and showed protein bands in spots 5, 6, and 7 whereas
some of them became down regulated in same
condition and has not expressed as in corresponding
spots of 1, 2, and 3 in treated condition in ADSY R. In
case of ADSY K that the lower expression of a protein
in spot 4 has been observed. So, ultimately it can be
inferred from this analysis that protein profile of
ADSY R and ADSY K were different in stress
condition. This is perhaps due to the nullifying the
stress of arsenic. Almost similar results reported by
Chatterjee et al.
Isolation and Characterization of Arsenite Tolerant Bacterial Strains from Contaminated Water of West Bengal, India
8
Bachate et al. (2009) in their study where they
highlighted that Phylogenetically diverse arsenic-
resistant bacteria present in agricultural soils of
Bangladesh is capable of reducing arsenate to arsenite
under aerobic conditions.
Fig. 5: Level of arsenic in supernatant, cell wash and cell lysate of isolated bacteria
3.5. Bioinformatics Study
From the bioinformatics analysis using BLAST tool, it
has been found that isolates ADSY K (Fig.1a) and
ADSY R (Fig.1b ) has sequence homology with
Pseudomonas sp. and Bacillus sp. respectively. In
multiple sequence alignment, ADSY R has maximum
alignment with most of strain of Bacillus megaterium
and Bacillus aryabhatti, while ADSY K (Fig.1c,
Fig.1d) has maximum sequence alignment with
Pseudomonasaeruginosaand bears most of their
morphological characteristics and property.
3.6. Antibiotic Sensitivity
Antibiotic sensitivity test results are given in Table 4.
From the Table 4 it is clear that ADSY K is much
more antibiotic resistant than ADSY R in lower
concentration. However, in higher dose ADSY R
showed much more antibiotic resistance against all the
tested antibiotics (Chloramphenicol, Ampicillin and
Tetracycline). Almost similar results were reported by
Dey et al. (2015).
3.7. Arsenic Concentration in Cell Culture
Level of arsenic was estimated from supernatant, cell
wash and cell lysate of bacterial isolate ADSY K and
ADSY R. Results revealed that bacterial isolate
ADSY K accumulates higher level of total arsenite in
both supernatant and cell wash (Fig. 5). However, in
cell lysate the bacterial isolate ADSY R accumulate
higher level of arsenite compared to the isolate ADSY
K (Fig. 5). Almost similar bioaccumulation of arsenic
from culture media by bacterial isolate strain AGH-21
was reported by Majumder et al. (2013). Their
isolated strain showed highest sequence similarity
(98%) with Bacillus sp. Apart from the arsenic
resistant bacteria, literature also cited the Cd(II),
Zn(II), Ni(II), Ag(I), Cu(II) resistant bacteria also
(Pepi et al., 2007; Moore et al., 2005).
Most arsenic resistant bacteria are separated from
arsenic-rich environments. In natural environments,
the number of arsenite resistant bacteria is less than
arsenate resistant bacteria (Jackson et al., 2005).
Among the isolated resistant strains from
contaminated water, two strains demonstrated
dramatic resistance to arsenite. These arsenite-
resistant strains were probably Pseudomonas sp. and
Bacillus sp. However, these two species showed
unequal bioremediation efficiency. Abu-shnab et al.
(2003) showed that in a contaminated soil, about
11.1% of isolated bacteria were resistant to As with
the MIC of 20 mM/L. High levels of soil- metal
concentration can lead to achieving such a high MIC
in resistant strains.
International Journal of Scientific Research in Environmental Sciences, 4(1), pp. 0001-0011, 2016
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Table 3: Biochemical tests result positive (+)ve and (-)ve indicates efficient growth and no response respectively. Sl
.
N
o.
Bacterial
Isolates
Growth
Parameters
Observed value
1 ADSY R NaCl Conc.
(M)
1M 2M 3M 4M 5M
OD at 620 nm 0.04 0.02 0.01 0.01 0.00
Co-resistance
to Pb
0.1mM 0.5mM 1mM
Dry weight
mass 0.04 0.03 0.01
Co-resistance
to Hg
0.1mM 0.5mM 1mM
Dry weight
mass 0.02 0.02 0.00
Temperature
(0C)
10 20 30 37 40
OD at 620 nm 0.04 0.05 0.19 0.17 0.28
pH 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0
OD at 620 nm 0.1 0.70 0.77 1.37 0.74 0.93 0.77 0.54 0.56
.
2 ADSY K NaCl Conc.
(M)
1M 2M 3M 4M 5M
OD at 620 nm 0.07 0.05 0.04 0.02 0.01
Co-resistance
to Pb
0.1mM 0.5mM 1mM
Dry weight
mass 0.05 0.01 0.00
Co-resistance
to Hg
0.1mM 0.5mM 1mM
Dry weight
mass 0.05 0.01 0.00
Temperature
(0C)
10 20 30 37 40
OD at 620 nm 0.02 0.05 0.14 0.15 0.16
pH 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0
OD at 620 nm 0.01 0.52 1.30 0.91 0.73 1.15 0.71 0.94 1.05
Table 4: Growth Parameters of ADSY R and ADSY K Bacterial Strain ADSY R ADSY K
Antibiotic Concentration (µg/ml) 200 400 600 800 1000 200 400 600 800 1000
Antibiotics Used
(Zone of Clearance)
Chloramphenicol 0.0 1.1 1.7 2.0 2.5 2.7 2.3 2.1 1.8 1.2 Ampicillin 0.0 1.1 1.3 1.7 2.0 0.0 0.0 0.0 0.0 0.0
Tetracycline 0.0 1.0 1.6 2.5 2.7 1.5 1.2 1.5 1.3 1.1
Also Chitpirom et al. (2009), in Thailand, isolated
arsenic-resistant bacteria from tannery effluent and
agricultural soils that were belonged to Klebsiella,
Pseudomonas, Comamonas and Enterobacter with the
MIC of 40 mM (arsenite) and 400 mM (arsenate).
Pepi et al. (2007) isolated 3 arsenic resistant genera
(Aeromonas, Bacillus and Pseudomonas) from
contaminated sediments with the MIC of 16.66 mM
(arsenite) and 133.47 mM (arsenate). They also
concluded that these bacteria are suitable for arsenic
bioremediation in contaminated sediments. In a study
by Luis et al. (2006) in Spain with the aim of
biological removal of arsenic,
Corynebacteriumglutamicum with over 60 mM
arsenite resistance identified as one of the most
tolerant species to arsenic. These results are in
agreement with our findings but our isolates could
tolerate the higher concentration of arsenite that was
related to high level of arsenite in water.
4. CONCLUSIONS
The naturally occurring arsenic-resistant isolates are
more environmentally acceptable and safe for
detoxification of arsenic. Hence, isolation of such
arsenic-resistant species has considerable ecological
advantage. However, characterization of arsenic
metabolizing genes is required for their successful
exploitation in in situ arsenic bioremediation. The
present study concentrated only on the assay of water
Chatterjee et al.
Isolation and Characterization of Arsenite Tolerant Bacterial Strains from Contaminated Water of West Bengal, India
10
for identification of microbes, and it is recommended
that a further study be conducted to find out the
contribution of microorganisms in the enhancement of
the arsenic level in the study area. In order to fully
appreciate the arsenic remediation potential of these
two selected isolates, further studies should be
focused with the biomass of these two isolates as
adsorbing material, optimizing the bioadsorption
conditions, the possible recycling of this bioadsorbing
material, and optimizing of the adsorbing and
desorbing conditions.
Acknowledgements
Authors gratefully acknowledge to the staff members
of both the Department of Biotechnology and
Department of Environmental Science for their
unconditional academic help. Moreover authors also
like to extend their gratitude to all senior professors of
the University of Burdwan, Burdwan.
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Dr. Sabyasachi Chatterjee
Research Area: Bioremediation of heavy metals, Phytoremediation, Medicinal Plants, Enzymology of
beneficial microbes, Arctic microbes.
Ph.D. in Botany, 1st class 1st in M.Sc Microbiology, presently faculty of the Biotechnology
Department, The University of Burdwan from 2007, lecturer in the field of Microbiology in Asansol
Girls’ College from 2002-2007.One of the CO-PI in a DST (SERC) sanctioned project on Arctic
microflora and production of their industrial enzymes. Reviewer for Bioremediation Journal (Taylor &
Francis), Journal of Medicine and Medical Science, African Journal of Microbiology (Academic
Publisher), Agricultural Science Research Journal. Editorial Board member for the Journal Trends in
Life Science, Trends in Parasitology Research, Journal of Medicinal and Aromatic plants (OMICS Group), Academia Journal
of Biotechnology, European Journal of Medicinal Plants, Annual Review and Research in Biology, Ecology and
Environmental Sciences, International Journal of Microbiology Research, Research in Biology. Published 24 research papers,
review articles in different International and National Journals and in Books. Life member of Association of Microbiologist of
India.
Yogesh Bhai Patel awarded with Master degree in Biorechnology (2012) from Dept. of Biotechnology,
The University of Burdwan. He has actively worked on current study as a part of his M.Sc. Project work
and remains exporing the possibility of efficient Bioremediation. He is currently working as Scientist in
R & D (Bioanalytical), Biocon Research Limited, where he engages with developing & validiating
Pharmacokinetic and Immunogenicity assays for the MAb based biotherapeutics.
Mr. SajjanRajpoot, I have received Bachelor of Technology (B.Tech) degree in Biotechnology from
EIILM University, Sikkim in year 2012. I then qualified JNU-CBEE(Jawaharlal Nehru University-
Combined Biotechnology Entrance Examination) session 2013-2015 and selected for DBT, Govt. of
India supported M.Sc. Biotechnology program in Department of Biotechnology, The University of
Burdwan, Burdwan, West Bengal. I did 6 months of in-house dissertation workon arsenic and received
the Master of Science (M.Sc.) degree in Biotechnology from Department of Biotechnology, The
University of Burdwan, Burdwanin 2015. In year 2015, I qualified GATE BT and also selected for West
Bengal Biotech Development Corporation’s (WBBDC) RISE program for internship at IIT-KGP,
Kharagpur. The area of my research interest is Microbial and parasitic diseases, Molecular Biology of
cell and Immunology.
Ms. Sonam Ran, I Pursued B.Sc. Biotechnology (session 2009-12) from G.L.A College, N.P.U,
Daltonganj, Jharkhand, and M.Sc.Biotechnology (through JNU-CBEE session 2013-15) ofDBT, Govt.
of India supported program from The University of Burdwan, Burdwan, West Bengal. Worked on
Arsenic Bioremediation during the course of M.Sc. as the dissertation project. After M.Sc. course,
selected for West Bengal Biotech Development Corporation’s (WBBDC) RISE program for internship
at BOSE Institute, Kolkata Areas of research apart from Ecotoxicology are study of cell signaling,
recognition and response in toxic environment.
Dr Naba Kumar Mondal presently holding the position as Assistant professor in the department of
Environmental Science, The University of Burdwan, India. Dr Mondal has experience more than 16
years of teaching and research in both Education and Environmental Science (masters degree). His
research interest includes: Pure Science:Adsorption Chemistry, Nutrient dynamics, indoor pollution, soil
Chemistry, Plant Physiology, Social Science: corporal punishment, development of teaching
methodology, noise and its impact on school children etc. Dr Mondal also published more than 170
research papers in reputed International and National Journals and four (06) Ph.D. scholars (upto
January’ 2015) and has been serving as an guest Editor and reviewer in many prestigious International
Journals.