Informatics Publishing Limited

S. Patra ¹, S. Chatterjee ², C. Chatterjee ³, T. Biswas ³, G. Mitra ⁴

Affiliations
1 Dept. of Microbiology, Burdwan Medical College;Burdwan Medical College, IN
2 Dept of Neurosurgery, Medical College Kolkata, IN
3 Dept. of Microbiology, Burdwan Medical College, IN
4 Dept. of Microbiology, Burdwan Medical College, IN

Abstract

The changing trends in infection trends of two most important mosquito borne members - Japanese Encephalitis (JE) virus, and Dengue virus, were studied, in the rice-belt area of West Bengal (a JE endemic zone). Objective of the study was to demonstrate the changing trends in flaviviridae infection, namely JE and Dengue virus, following a major vaccination drive Flaviviridae family- Dengue virus.

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T. Biswas ¹, S. C. Kole ¹

Affiliations
1 Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal, IN

Abstract

The effect of inherent arsenic loading on microbial growth in polluted soils of Haringhata block in the district of Nadia, West Bengal as well as the arsenic tolerant ability of the composite cultures of the said soils in different concentrations of arsenate (As^V) and arsenite (As^III) at different hours of incubation were studied. Total arsenic loading in the affected soils ranged from 4.70 to 16.56 mg/kg and to that of Olsen extractable arsenic (available arsenic) from 0.74 to 2.98 mg/kg. Total and available arsenic loading adversely affected the bacterial and cyanobacterial population, but not the fungi and actinomycetes. Significant negative correlations were obtained between total soil arsenic and bacterial population (r = -0.798^** in CFU and -0.800^** in MPN method), available arsenic and bacterial population (r = -0.870^** in CFU and -0.783^** in MPN), total soil arsenic and cyanobacterial population (r = -0.853^**) as well as available arsenic and cyanobacterial population (r = -0.857^**). As^III was more toxic than As^V, the growth of the composite cultures appeared up to 20,000 mg/L in As^V enriched broth and up to 500 mg/L in As^III enriched broth in some of the soils after 168 hours of incubation. On an average, with increase in incubation period, arsenic tolerance ability increased and microbial growth appeared at the higher levels of As concentration. Microbial growth appeared at higher concentration of As^V and As^III with those soils having comparatively higher inherent As loading.

Keywords

Arsenic, Tolerance Limit, Microorganisms, Polluted Soil.

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