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Role of cooperative
companies in sustainable rice production and poverty
alleviation in Guilan state of Iran
Mohammad Karim Motamed*
Department
of Extension, Faculty of Agricultural Sciences, University
of Guilan, Iran. E-mail: mkmotamed@yahoo.co.in.
Accepted 31
August, 2009 |
|
A
bacterium, Pseudomonas lubricans, isolated
from heavy metal laden industrial wastewater, has been shown
to tolerate multiple heavy metals suggesting its importance
in bioremediation of industrial effluents. P. lubricans
tolerated As(III) up to 3 mg ml-1, Cu2+
up to 0.7 mg ml-1, Hg2+ up to 0.4 mg
ml-1, Ni2+ up to 0.4 mg ml-1
and Cr6+ up to 0.5 mg ml-1. P.
lubricans showed optimum growth at pH 7 while optimum
temperature for growth was 30°C. P. lubricans could
oxidize As(III) 42% (42 µg mg-1 of protein), 78%
(78 µg mg-1 of protein) and 95% (95 µg mg-1
of protein) from the medium after 24, 48 and 72 h of
incubation at optimal conditions, respectively. The arsenite
oxidizing ability shown by P. lubricans indicates its
potential application in biological treatment of wastewaters
contaminated with arsenic.
Key
words:
Arsenic, wastewater, Pseudomonas lubricans,
bioremediation. |
