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Articles by M. Sen
Total Records ( 3 ) for M. Sen
  M. Sen and M. Ghosh Dastidar
  Biosorption of Cr(VI) from aqueous solution was studied in a batch bioreactor using the resting cells of filamentous fungal biomass (Aspergillus sp.) isolated from industrial wastewaters. The specific Cr(VI) removal (mg/g of dried biomass) decreased with increase in pH and increased with increase in initial Cr(VI) concentration, upto 500 mg/L. By increasing biomass concentration from 2.4 to 5.2 g/L, the specific metal removal remained almost constant. The studies carried out by using the resting cells from various stages of growth indicated maximum Cr(VI) removal of 34.8 mg/g using the biomass from the beginning of the stationary phase. The adsorption equilibrium constants Qº (42.9 mg/g) and b (0.0091/mg) were obtained from the Langmuir adsorption isotherm model.
  M. Sen and M. Ghosh Dastidar
  Chromium is one of the toxic heavy metals which exists in nature as stable hexavalent and trivalent forms. The hexavalent form of chromium is more toxic than trivalent chromium as it persists indefinitely in the environment complicating its remediation. The conventional physical and chemical treatment techniques used for the removal of Cr(VI) are expensive and highly energy intensive, moreover they produce harmful by-products, ultimate disposal of which again causes secondary pollution. Removal of Cr(VI) from aqueous solution using biological sources as biosorbent has assumed advantageous over the existing conventional physico-chemical techniques for the treatment of metal contaminated wastes. The present batch biosorption study was undertaken with an aim to examine the Cr (VI) removal potential of the resting cells of Fusarium solani (isolated from soil) from aqueous solution. The specific Cr (VI) removal decreased with increase in pH and increased with increase in initial Cr(VI) concentration , up to 500 mg/L . The specific Cr(VI) removal remained almost constant by increasing biomass concentration from 2.4 to 5.2 g/L. The studies also carried out by using the resting cells obtained from various stages of growth and the maximum specific Cr(VI) removal (60 mg/g ) was achieved at 500 mg/L initial Cr(VI) concentration and by using cells (36 h old). The Langmuir adsorption isotherm constants, Q0 and b were observed to be 57.1 mg/L and 0.06 l 1/mg, respectively.
  J Kishore and M. Sen

A 5-year-old male, drowsy, jaundiced child presented with fulminant hepatitis and had HAV and HEV infection. He had hepatic encephalopathy grade 1, fever, pallor, hypotension, crepitations in his right lung base and hepatosplenomegaly with dyspnoea. He had highly raised liver enzymes and hypoalbuminemia (2.8 g/dl) but anemia (hemoglobin of 7.7 g/dl and 5.7 g/dl 2 days later), reticulocytopenia and severe thrombocytopenia (44 x 109/l) were unexplained. Parvovirus B19-specific IgM antibodies and B19 DNA were found in the serum of the child. Chest X-ray showed pleural effusion and bronchopneumonia, while blood culture isolated coagulase-negative staphylococci (BACTEC 9120) and he had low oxygen saturation. Hence, he was treated with IV amoxicillin+ clavulinic acid and oxygen inhalation. He had seizures and cardiac arrest but was revived. On the third day his condition worsened and the child died despite intensive care. Hence it is concluded that his anemia and thrombocytopenia were B19 induced and this might have aggravated or caused fulminant hepatitis.

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