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Articles by M. Zahangir Alam
Total Records ( 2 ) for M. Zahangir Alam
  Jalal K.C.A. , Ambak M.A. , Abol M.A.B. , Torla Haji. Hassan and M. Zahangir Alam
  Tor tambroides fry with a mean of 8.0±0.72 mm standard length (SL) and weighing (W) 0.06±0.01g were stocked at the rate of fifty (50) individuals in each of the fifteen 150l rectangular fibre glass tanks for a period of 5 weeks. The development of proteolytic enzymes (Trypsin and Chymotrypsin) was studied during these feeding treatments. 45% protein diet without additives was treated as control diet. The gut of fish fry fed on control diet incorporated with 0.10% Spirulina, 0.10% enzyme and 0.10% vitamin additives were examined. Fish fry fed on diet with 0.10% Spirulina showed significantly higher enzymatic activity (P<0.05) compared to enzyme, vitamin and control diet throughout the experiment. Control diet without any additive showed lower activity than those of diets with additives. This study indicates that the incorporation of 0.10% Spirulina to a diet could be a vital factor to activate the proteolytic enzymes such as trypsin and chymotrypsin of the Tor tambroides fry. This suggests a new approach in the use of feed additive Spirulina in fish feed.
  P. Jamal , M. Fahrurrazi Tompang and M. Zahangir Alam
  Two-steps optimization strategy based on statistical experimental design was carried out to enhance bioprotein production by liquid state bioconversion utilizing pineapple skins as substrate. A two-level Plackett-Burman design was employed first where 11 variables were studied for their influence on bioprotein production. Pineapple Skins Soluble (PSS) sugar content, KH2PO4 and NH4H2PO4 were the most significant variables for improving bioprotein production. A three-level Central Composite Design (CCD) was employed for maximizing the bioprotein production. A mathematical model was developed to show the effects of each medium component and their combinatorial interaction on bioprotein production. The optimal medium composition for maximum bioprotein production was PSS content 1.0%, KH2PO4 0.1% and NH4H2PO4 0.25%. The final experiment was carried out to validate the model, which has shown to produce 514.2 g kg-1 bioprotein on the 5th day of fermentation with a slight increase of 0.02% from the experimental run in CCD.
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