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Articles by M. Shuhaimi
Total Records ( 7 ) for M. Shuhaimi
  A.Q. Sazili , M.Z. Noor Azihan , M. Shuhaimi , M. Hilmi and J.M. Panandam
  The present study was conducted in an attempt to study the effects of the type, pH and molarity of extraction buffer on protein extractability from beef Longissimus dorsi (LD), Supraspinatus (SS) and Semitendinosus (ST) muscles. All muscle samples were dissected out from carcass immediately after slaughter and subjected to extractions using freshly prepared buffers of different buffer type (Tris Base and Tris HCl), pH (8.3 and 7.5) and molarity (100 and 20 mM). Following extraction, the total extractable protein concentration was determined by Bradford assay. The results exhibited significant (p<0.05) effects of muscle type X buffer interaction on extracted total protein concentration. The statistical analysis also revealed interaction between type of buffer, pH and molarity significantly (p<0.01), affected the extracted protein concentration. Based on the results, optimal buffer suggested to use for muscle protein extraction is Tris-Base with pH 8.3 and 100 mM. The present study demonstrated that the extractability of skeletal muscle protein was significantly influenced by the type, molarities and pH of the extraction buffers used.
  D.T. Lemma , M. Ramasamy and M. Shuhaimi
  The widely used dynamic models for identification of linear time invariant systems in process industries are Auto Regressive with Exogenous Input (ARX) and Finite Impulse Response (FIR) models. Their popularity is due to their simplicity in developing the model. However, they need very large amount of data to reduce variance error, in addition ordinary ARX model structures lead to inconsistent model parameters. Orthonormal Basis Filter (OBF) model structures permit incorporation of prior knowledge of the system in the form of one or more poles, which renders it the capacity to capture the system dynamics with a few number of parameters (parsimonious in parameters). In addition, the resulting OBF models are consistent in parameters. The model parameters can be easily developed using linear least square method. In this study, OBF model development for simulation and real case studies is presented.
  Lemma D. Tufa , M. Ramasamy and M. Shuhaimi
  Closed-loop identification scheme using OBF-ARMAX model structure is presented. The proposed structure can be used to identify both open-loop stable and open-loop unstable processes that are stabilized by a feedback controller. The algorithm for estimating the model parameters and the formula for the multi-step ahead prediction are derived. The proposed identification scheme is demonstrated using two simulation case studies: One for open-loop stable and another for open-loop unstable. Both case studies demonstrate that the proposed scheme can be effectively used for closed-loop identification of both open-loop stable and open-loop unstable systems that are stabilized by a feedback control system.
  M.N. Usama , A. Sherine and M. Shuhaimi
  Due to the increasing demand for natural gas in the world today, transportation of natural gas from different parts of the world has become a necessity. Liquefying of the natural gas provides a safer and cheaper alternative for its transportation and increases its storage capabilities. However, it has been accounting for the highest operating cost if compared to the other chain of the industry. Hence, liquefaction process has been a key area that constantly in need for development to save cost and increase LNG plant capacity through production. This study reviews for the current development of natural gas Liquefaction (LNG) technologies. The cost items equipments that affect the overall operating cost of the plant and equipments efficiency will be discussed. Studies had been done on several parameters that influence the process efficiency and lead to wide difference in the production of LNG in a plant. These include the tube side design pressure, end flash quantity, temperature approach on main condenser, compressor efficiency, LPG recovery and also liquefaction technologies. Nevertheless, further studies and in depth understanding on the fundamentals of liquefaction process is still required in order to develop innovative methods to further increase the capacity, efficiency and consequently the production of LNG in a LNG plant.
  M. Shuhaimi , A. M. Yazid , A.M. Ali , M.H. Ghazali , H. Zaitun and N.A.Nur Atiqah
  Bifidobacterium isolates obtained from infants stools were assessed for their ability to survive in HCI solutions adjusted to pH levels of 1.0, 2.0, and 3.0. Five isolates (Bifidobacterium breve C20, B. infantis D22, B. infantis F91, B. infantis G4 and B. infantis Z45) out of 28 were able to survive at pH 1.0 after 0 h exposure. Survival was not detected after 1 h exposure to this pH level. At pH 2.0, only five isolates (B. infantis D22, B. infantis F66, B. infantis F34, B. breve F100 and B. infantis G4) survived after 1 h exposure. Four isolates (B. infantis D22, B. infantis F117, B. infantis F34 and B. infantis Z45) were able to survive at pH 3.0 during the 3 h incubation period. At pH 6.5 (control), essentially all isolates of bifidobacteria survived during 3 h incubation.
  Idris, Y.M.A. , A.B. Sipat , M. Shuhaimi and A.M. Yazid
  Streblus asper (Kesinai) leaf contains a protease, which can be used to coagulate milk. This extract however, has a undesirable, very dark brown colour due to enzymatic browning. Several browning inhibitors were used in this study with the objective of preventing browning during extraction of the protease. Ascorbic acid at 10 mM concentration reduced browning and polyphenol oxidase (PPO) activity by 41 percent and 10 percent. The protease specific activity and coagulation activity were 88 percent and 143 percent. Citric acid at 10 mM concentration reduced browning and PPO activity by 64 percent and 72 percent. However, it has reduced protease and milk coagulation activity by 76 percent and 65 percent, respectively. L-cysteine inhibited browning and the minimum threshold was found to be 5 mM. It improved protease activity and milk coagulation activity, but did not inhibit PPO activity. Sodium metabisulphite was found to be more effective inhibitor of Streblus asper browning and the minimum threshold for inhibition was 2 mM. Metabisulphate treated extract has higher protease activity, milk coagulation activity and lower PPO activity compared to extracts prepared using other chemicals and to the control.
  Yazid A.M , M. Shuhaimi , A.R. Raizawanis and M. Rezaei-Sabet
  The degree of bile tolerance and their action on conjugated bile salts were studied on six different strains of Bifidobacteria. They were Bifidobacterium infantis (ATCC 27920), B. adolescentis (ATCC 11146), B. breve (ATCC 15698), B. bihdurn (ATCC 35914) and B. longum (ATCC 15708). Sodium taurocholate was used as conjugated bile salt. The ability to grow in the presence of 0.3 percent bile salt varied among the six strains tested. B. longum (ATCC 15708) was the most tolerant strain.TPY broth containing 0.05 percent of sodium taurocholate was used to measure the deconjugation activity. All bifidobacteria tested were able to deconjugate conjugated bile salt but at various degrees. B. infantis (ATCC 27920) showed the highest deconjugation activity, where the cholic acid released was 0.015 μmol/ml.
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