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Articles by S.A. Aziz
Total Records ( 4 ) for S.A. Aziz
  L.K. Shyuan , L.Y. Heng , M. Ahmad , S.A. Aziz and Z. Ishak
  An bioelectrochemical sensor or biosensor based on the inhibition of the enzyme Alkaline Phosphatase (ALP) has been investigated for the screening of several environmental toxicants. The biosensor was constructed by immobilizing ALP in a hybrid sol-gel/chitosan film that was deposited on the surface of a screen-printed carbon paste electrode (SPE). The inhibition was measured via the catalytic hydrolysis of ascorbic acid 2-phosphate (AA2P) by the enzyme to produce ascorbic acid. Oxidation of this product was monitored amperometrically and the current change was then related to ALP activity. Toxicity of herbicides (2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), insecticides (carbofuran and α-endosulfan) and heavy metals (Hg2+, Cd2+, Ag2+, Zn2+ and Cu2+) towards the biosensor were evaluated. Various degrees of inhibition of ALP occurred when the biosensor was exposed to herbicides and heavy metals. This resulted in a lower acid ascorbic production by the enzyme from the substrate, thus a decrease in the current response of the biosensor. The herbicides 2,4-D and 2,4,5-T showed the largest inhibition effect on ALP with linear response range of 1-60 μg L-1 (R2 = 0.92). The maximum inhibitions caused by 2,4-D and 2,4,5-T were 46 and 30%, respectively. Heavy metals caused inhibition on ALP at the higher concentration range of mg L-1. Thus, the biosensor may be useful for the screening of chlorophenoxyacetic acid herbicides even in the presence of other environmental toxicants.
  A.M. Roslan , P.L. Yee , U.K.M. Shah , S.A. Aziz and M.A. Hassan
  Cellulase production in situ was considered as one of the alternatives to reduce bioethanol production cost. In this study, cellulase enzyme was produced from rice straw by locally isolated Aspergillus sp. in solid state fermentation. The crude cellulase was measured to have activity of 6.3 FPU g-1 rice straw. The rice straw was pretreated by few cycles of wet disc milling prior saccharified it using the crude cellulase produced. More than 90% glucose from total cellulose was released by the saccharification. The saccharified product was subjected to fermentation by yeast. The highest bioethanol yield produced from the fermentation was 0.102 g g-1 rice straw which is equivalent to 62.61% of theoretical bioethanol yield. It was concluded that the use of crude cellulase from rice straw onto rice straw can lead to a good yield of bioethanol, provided an effective pretreatment was used.
  M.S. Hossain , M.N. Haque , S.A. Aziz , M.S. Mazumder , M.L. Ali and A.T.M. M-E-Elahi
  Thirty-six indigenous postpartum cows were given dry straw ad libitum + 1.5 kg concentrates (control) or UMS ad libitum + 1.5 kg concentrates (treated). Cows were stall fed. Calves were tied up at night and allowed to free access or suckling to the cows during the whole day. The cows were milked only in the morning. Live weight change of cows and calves were recorded monthly and milk yield was recorded daily. The reproductive performance of cows was also studied. Live weight change of cows -57.40 and 37.75 g/d (P < 0.05); milk yield of cows 1.83 and 2.52 kg/d (P < 0.01); calf weight gain 96.99 and 139.35 g/d (P < 0.01); calving to first service interval 182 and 113 days (P < 0.01) ; calving to conception interval, 210 and 134 days (P < 0.01) and number of services per conception 2.11 and 1.94 (P >0.05), for controlled and treated groups respectively. It is concluded that UMS can be fed for improving the productive and reproductive performance of indigenous cows under the village conditions of Bangladesh.
  M.N. Haque , S.A. Aziz , S.S. Chanda , M.I. Hossain and M.A. Baset
  Various milking and reproductive performances were analyzed. The effects of concentrate feed were found significant on age at weaning AW (p<0.001) age at first heat (AFH) (P<0.05) age at first conception (AFH) (P<0.001) No. of services per conception (P<0.05), age at first calving (P<0.001) post partum heat period (PPHP) (P<0.001), calving interval (Cl) (P<0.001), daily milk yield (p<0.05) and lactation length LL (P<0.001). The effects of management level were significant on AW (P<0.001), PPHP (P<0.01), CI (P<0.001) and daily milk yield (P<0.05). The overall mean values were 245.80± 3.80 days for AW, 35.30±0.40 months for AFH, 37.20± 0.70 monthly for conception, 46.20±0.40 monthly for AF calving, 1.30±0.10 for no. of services for conception, 182.90± 4.80 days for PPHP, 15.50±0.20 months for CI, 2.50±0.30 kg for daily milk yield and 250.60±4.50 days for lactation length.
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