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Articles by R. Abdullah
Total Records ( 6 ) for R. Abdullah
  F.A.A. Fuad , I. Ismail , N.M. Sidik , C.R.C.M. Zain and R. Abdullah
  The aim of this study was to compare the efficiency of two transformation vectors: binary and super binary vector in the process of gene transfer and expression in oil palm tissues. Two transformation vectors, namely pFA2 (binary vector, ~24.4 kb) and pFA3 (super binary vector, ~39.4 kb) that contains four essential genes (bktB, phaB, phaC and tdcB) to produce polyhydroxyvalerate have been successfully constructed. The two transformation vectors and pMR505, which used as a control were later transformed into oil palm tissues mediated by Agrobacterium tumefaciens. Oil palm immature embryos were cocultivated with A grobacterium. tumefaciens that carry pFA2, pFA3 and pMR505 separately and also contain the higromycin phosphotransferase (hpt) and α-glucuronidase (gus) genes. GUS assay was carried out on putatively transformed immature embryos as an indicator of successful gene transfer. From the analysis, high percentage of transient GUS expression ranging from 52.6-85.7, 70.5-96.7 and 80.9-93.8% for pFA2, pFA3 and pMR505, respectively were obtained from putative transformed immature embryos. The successful integration of bktB (1.2 kb), phaB (0.8 kb), phaC (1.0 kb) and tdcB (0.9 kb) genes into the immature embryos genome were confirmed by PCR analysis. Relative quantification through real-time PCR analysis indicates that the expression of PHBV gene in oil palm immature embryos transformed with pMR505 is 7 times higher than non transformed immature embryo, followed by transformed with pFA2 (2 times) and pFA3 (0.7 times), respectively. Thus, this data suggest the efficiency of super binary vector compared to binary vector in transferring foreign genes and enhancing its expression in oil palm tissues.
  H. Naderi , R. Abdullah and H. Tengku Aizan
  The study investigated the difference between gender-role identity and intelligence of students at Universities. The samples were 153 participants consisting of 48 females and 105 males` undergraduate Iranian students in Malaysia Universities. All students were given a Catell Culture Fair Intelligence Test (CCFIT). The instrument consisted two subscales, namely, intelligence (Form A) and intelligence (Form B). Each subscale had fifty items. The mean age and SD for female`s students (FS) were 22.27 and 2.62, for ages of 18 to 27 and for male`s students (MS) mean age and SD were 23.28 and 2.43, for ages of 19 to 27. The sampling method in this study was the simple randomization method. Descriptive statistics focusing on average and t-tests were used to examine differences between male and female students in this study. The CCFIT as a questioner test included 100 items about quantitative the 2 parts of Intelligence (Form A) (50 items) and intelligence (Form B) (50 items). In general, the results were not found significant between female and male students in relation to intelligence. Further research is needed to investigate whether identify factors at the university environment influence the development of female and male`s intelligence.
  K. Shafinah , M.H. Selamat , R. Abdullah , A.M. Nik Muhamad and A.G. Awang Noor
  System evaluation is a necessary step in system development process to measure the successfulness of a system. However, this step has often been overlooked by system developers during the development process. This study aimed to discuss several system evaluations for Decision Support Systems (DSSs) and to explain the methodology used to evaluate a DSS model. In this study, a DSS model has been developed to assist decision makers to select an appropriate tree species to be planted for commercial tree planting. Based on few literatures, eight usability factors (efficiency, understandability, operability, attractiveness, error prevention, learnability, accuracy and effectiveness) have been identified for the evaluation process. The results present the usability level for each factor and indicated the tested DSS model is in the excellent level. It is anticipated that system developers can improve the DSS based on these findings as well as from the comments and suggestions made by the respondents.
  H. Naderi , R. Abdullah , H. Tengku Aizan , J. Sharir and V.K. Mallan
  This study investigated the difference between gender-role identity and creativity of students at Malaysian Universities. The respondents were 153 undergraduate Iranian students (48 females, 105 males; aged 19 to 27 years) in Malaysia Universities. All students were given a Khatena-Torrance Creative Perception Inventory Test (KTCPI). The instrument comprised two subscales, namely, Something About Myself (SAM) and What Kind of Person Are You (WKOPAY)? Each subscale had fifty items. The results revealed no significant difference between female and male students` overall creative perception. Further examination revealed that male students score higher in the WKOPAY subscale (t = 2.578, p = 0.011), while females scored higher than males in the initiative factor (t = 3.566, p = 0.000) and males scored higher than females in the environmental sensitivity factor (t = -2.216, p = 0.028) in the SAM subscale. Further replications on similar samples are needed.
  N. Huda , R. Abdullah , P. Santana and T. A. Yang
  This study investigated the effect of five different dryoprotectants (sucrose, sorbitol, polydextrose, palatinose and trehalose) to protect protein of surimi powder during the drying process. Threadfin bream (Nemipterus japonicus) surimi powders treated with five different dryoprotectants and a control without dryoprotectant were produced using the oven-drying method at 60±5°C and their functional properties were compared. Treated surimi powders contained 74.80-75.34% protein which was lower than that of the control (88.60%). In contrast, the carbohydrate content of treated surimi powders (13.06-14.83%) was also higher than that of the control (0.01%). Treated surimi powders exhibited better emulsification, foaming properties and protein solubility in 3% NaCl compared to the control. However, there was no significant difference in water holding capacity among treated samples and the control (p>0.05). Overall, this study found that the addition of trehalose provided the best dryoprotective effect, followed by palatinose, sucrose, polydextrose and sorbitol.
  R. Abbasalipourkabir , A. Salehzadeh and R. Abdullah
  Recently more focus has been put to the development of innovative drug-delivery systems that includes polymer nanoparticles, emulsions and liposomes and solid lipid nanoparticles (SLNs). The SLNs have been proposed to be an alternative colloidal drug delivery system. The aim of this study was preparation and characterization of solid lipid nanoparticle (SLN) using varieties of emulsifier for encapsulation of the drug with poor water solubility. In these study four types of solid lipid nanoparticles were prepared based on different compositions of palm oil (S154) and lecithin (Lipoid 100) using the high pressure homogenization method. The SLN formulation had the following (palm oil+lecithin) compositions: SLN-01 (90+10%, respectively), SLN-02 (80+20%, respectively), SLN-03 (70+30%, respectively) and SLN-04 (60+40%, respectively). The SLNs were characterized and the optimum stability factors for one year storage determined. The parameters used to characterize the SLNs were particle size and polydispersity index (particle sizer), zeta potential (zetasizer), crystallinity (differential scanning calorimetry and wide angle X-ray diffraction), ultrastructure (transmission electron microscopy). Varying the palm oil and lecithin compositions resulted in SLNs of variable sizes and zeta potentials. The particle sizes of SLN-01, SLN-02, SLN-03 and SLN-04 were 298.40±11.80, 255.40±3.20, 145.00±3.39 and 273.00±86.50 nm, respectively, while the zeta potentials were -19.44±60.00, -19.50±1.80, -17.83±10.00 and -13.33±2.30 mV, respectively. Thermoanalysis and X-ray diffraction analysis showed that the SLNs had lower crystallinity than bulk lipid. The SLNs were generally round and uniform in shape under transmission electron microscopy. The SLN dimensional data suggested they had high quality physicochemical characteristics, which are conducive for the loading of poor water solubility drugs.
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