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Articles by Z.C. Cob
Total Records ( 6 ) for Z.C. Cob
  S. Abdullah , M.H. Selamat , Z.C. Cob and U.S. Sazaly
  In this study, we proposed a framework for measuring knowledge transfer process in e-learning environment. This framework provides an element that covers all aspects to better evaluate the KTP and e-learning and provide a better description in explaining issues of effectiveness. We set up questionnaires to survey users of E-Faculty (e-learning system developed by FSKTM, UPM) and make a descriptive and inferential analysis for better findings on measurement attributes and correlation between hypothesis and testing result. We conclude that our framework provide a proper guideline to conduct evaluation on determining the effectiveness of process in e-learning.
  Z.C. Cob , A. Arshad , J.S. Bujang and M.A. Ghaffar
  The age, growth, mortality and population structure of Strombus canarium Linnaeus, 1758 were examined in the Johor Straits, Malaysia from January to December 2005. A total of 2088 conchs were sampled where females were more abundant than males with monthly sex ratio of 1.72±0.17 (N = 12). The estimated growth parameter showed higher asymptotic length (L) and growth coefficient (K) in females (L = 70.20 mm, K = 1.50 year-1) compared with the males (L = 69.30 mm, K = 1.20 year-1). This resulted in better overall growth performance of females (φ’ = 3.81) compared with the males (φ’ = 3.48). The growth pattern of females and males showed positive allometric nature of growth (b>3, p<0.05), with estimated maximum life span of 2.0 and 2.5 year, respectively. The recruitment pattern was continuous, displaying only a single major peak event per year. The estimated natural mortality rate (M) was 0.95 year-1 in females and 0.86 year-1 in males, while the total mortality rate (Z) was 2.56 and 2.72 year-1, respectively. The fishing mortality rate (F) was 1.61 year-1 in females and 1.86 year-1 in males, which were higher than the natural mortality rates, thus indicating an unbalanced position of the stock. In addition, the exploitation rate (E) was higher than the maximum allowable limit of exploitation (EMSY), which was a further indication of overexploitation. For sustainable utilization of the resource, serious efforts should immediately be taken in reducing the exploitation rates of S. canarium in the study area.
  Z.C. Cob , A. Arshad , J.S. Bujang , W.L.W. Muda and M.A. Ghaffar
  Strombus canarium is a commercially important gastropod that has great potential for advancement into aquaculture. In this study, the metamorphosis response of Strombus canarium larvae to various metamorphosis cues associated with conch nursery habitat and to KCl and GABA, were tested. Bioassays were run as static, no choice experiment and adopting a continuous exposure approach. Strombus canarium larvae showed strong metamorphosis responses when sediment (i.e., conch nursery habitat sediment/SD-NU) and detrital substrata (i.e., Thalassia detritus leachate/T-LC) from their nursery habitat were used (p<0.05). There was no metamorphosis in treatments using sterilized conch nursery habitat sediment (SD-ST) and sediment taken from outside conch nursery habitat (SD-OT). Experiments using fresh macrophyte blades of Enhalus acoroides (EA), Thalassia hemprichii (TH), Halophila ovalis (HA) and Ulva (UL) and adult conditioned seawater (SD-SW) also showed negative respond. Conch larvae demonstrate active habitat selection during metamorphosis and no spontaneous metamorphosis was observed. Settlement in S. canarium is associative in nature where epibionts associated with conch nursery habitat could be the cue for the metamorphosis. However, the specific epibionts/inducers and mechanisms underlining the process were not studied and therefore are subjected to more detailed investigation. The use of KCl was comparable with treatments using natural inducers (SD-NU and T-LC), thus was suggested for application in hatchery spat production of the species.
  K.D. Simon , A.G. Mazlan , Z.C. Cob , A. Samat and A. Arshad
  In this study the most common bony structure (scales) and method was investigated for age determination of archer fishes. A total of 85 specimens of archer fishes (Toxotes chatareus and Toxotes jaculatrix) from the estuaries of South Johore, Malaysia were examined for age. Scale length is linearly proportion (r = 0.816) to standard length (SL). Relationship between scale length (L) and scale weight (W) can be expressed by the formula W = 0.0155L2.917. Daily growth rings and annulus of scales count up demonstrated that the ages of the samples for both species were mostly 1-2 years and a handful samples of T. jaculatrix were above 2 years.
  A. Arshad , S.M. Nurul Amin , Y.L.Z. Nuradiella , Z.C. Cob , R. Ara and D. Aziz
  The study was an attempt to examine the size frequency distribution, length-weight relationship and morphometric variation of the Acetes japonicus from four different sides of Kedah coastal waters between March to May 2007 by using SPSS and PRIMER software. The average total length of the females from Batu Lintang and male of Tg. Dawai were the highest with the values of 17.07 and 13.93 mm, respectively. The growth co-efficient (b) values ranged between 2.0 to 4.0, indicating varieties of the growth pattern (negative allometric, isometric and positive allometric) for A. japonicus. The highest correlation of length-length relationship in female and male were found in the population of Kuala Sala. The morphological characteristics showed variation among populations. The highest similarity of morphometric characteristics was between Batu Lintang and Tg. Dawai for all groups (female, male, combined sexes).
  Z.C. Cob , A. Arshad , J.S. Bujang and M.A. Ghaffar
  This study was conducted to analyze variation in Strombus canarium larvae development, growth and survivals when cultured during wet (main reproductive period) and dry seasons. Larvae were reared at 200 larvae L-1 in filtered seawater (0.22 μm) and fed with Isochrysis galbana at 1000 cells mL-1 ad libitum. The culture environment was maintained at 29 ± 1°C, salinity of 30 ± 1 PSU and photoperiod of 12:12 light dark cycle. Growth of the larvae was described on a length-at-age basis using the modified Gompertz regression. There was high correlation in shell length-at-age relationship for both wet season (R2 = 0.99) and dry season (R2 = 0.98) culture experiments. The maximal growth rate (M) and survival rate (S) were higher for larvae cultured during wet season (M = 62.44 μm day-1, S = 14.36 ± 2.31%), compared with dry season (M = 43.05 μm day-1, S = 5 ± 1.15%). The maximal attainable larval size (a) was however lower during wet season (950.19 ± 66.93 μm shell length) compared with dry season (1343.05 ± 586.51 μm shell length), which might be due to significantly low larvae density in the latter. Further studies are needed to investigate variation in bio-chemical composition of the egg mass, which was suggested as the main reason for the differences.
 
 
 
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