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Articles by A.W. Mohammad
Total Records ( 3 ) for A.W. Mohammad
  R. Raslan and A.W. Mohammad
  Membrane fouling phenomenon is a major problem for efficient use of ultrafiltration membranes and resulted in reduction of throughput and performance. Hence, an attempt has been made to develop a low-fouling membrane material by blending polymers. Blending of polysulfone (PSU) and Pluronic F127 was carried out to prepare membranes with hydrophilic and low-fouling property. PSU and Pluronic F127 were blended in 100/0, 90/10 and 80/20 compositions using N-methyl-2-pyrrolidinone (NMP) as solvent and membranes were prepared by the phase inversion technique. The membrane morphologies were characterized by Scanning Electron Microscopy (SEM). The results showed an asymmetric morphology of PSU/Pluronic F127 membranes. The static contact angles of blend membranes were measured using a contact angle goniometer. The decrease of static water contact angle with an increase in Pluronic F127 content indicated an increase of surface hydrophilicity. The stability of Pluronic F127 in blend membranes was evaluated by Attenuated Total Reflection Fourier transform infrared spectrometer (ATR-FTIR). The results analysis confirmed that Pluronic F127 could exist stably in blend membranes. The permeation flux of pure water under different pressures was investigated. It was found that blend membranes have higher permeability than that of PSU-control membrane.
  S.J.H.M. Yusof , M.S. Takriff , A. Amir , H. Kadhum , A.W. Mohammad and J. Jahim
  The addition of organic acids to the growth medium has been shown to stimulate solvent production and protect against the degeneration of ABE-producing clostridia. The objective of this study is to demonstrate the effect of introduction of butyric acid in the fermentation media on the solvent production by C. acetobutylicum NCIMB 619. In this study, batch cultures were carried out in Reinforced Clostridial Media (RCM) containing 0.0015 and 2.0 g L-1 of butyric acid, simultaneously with a control media (without addition of butyric acid) at 37°C for 72 h. It was found that the presence of butyric acid during the early stage of the fermentation process favor the solvent yield to glucose utilization up to 71%. By adding butyric acid, the concentration of acetone and butanol generated was improved significantly. In the case of 2.0 g L-1 butyric acid addition, acetone and butanol production was increased approximately 5 and 1.6 folds, respectively compared to control culture. The result obtained in this study showed that the addition of butyric acid not only promoted solvent production, but also induced butanol production at the initial stage of fermentation by C. acetobutylicum NCIMB 619.
  N. Mohd Suhimi and A.W. Mohammad
  The objective of this study was to study the performance of a pilot-scale spray dryer and observed the effect of feed concentration during spray drying of gelatine. The spray drying conditions were manipulated in terms of feed concentration, inlet temperature and feed flow rate. In all experiments, the atomizer rotation and air flow rate were fixed at 23500 RPM and 66 m3/h. The result showed that if feed concentration of gelatine solution 10 and 15% (w/v), the product in the form of powder would not be obtained. So, the feed concentration 5 and 6% was chosen to analyze the powder of gelatine from spray drying. The quality of spray dried gelatine was compared with the Industrial Food Grade gelatine (bloom strength 151-160).
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