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Articles by L. Hassan
Total Records ( 4 ) for L. Hassan
  Bisht, K.S. , N. Salim , L. Hassan , Z. Zunita , M.I. Kamarudin and A.A. Saharee
  Data on Haemorrhagic Septicaemia (HS) mortalities and climatological conditions (rainfall and temperature) were collected from 1993 to 2003 and subjected to a time series seasonal decomposition analysis. The 12-month Centered Moving Averages (CMA), Seasonal Indices (SI), Trends (T) and Cyclic patterns (C) were computed. A total of 1,489 mortalities of HS were recorded in Peninsular Malaysia with 62.9% of mortalities recorded during the last five years of the study period (1999-2003). The higher number of HS mortalities appeared to occur in the 1st and 4th quarters of the year. Seasonal index showed the greatest values during the months of 1st and 4th quarters of the year and the lowest indices were observed in 2nd and 3rd quarter of the year. The existence of 2-3-year cyclical fluctuations was observed with major peaks occurring in December 1998 to May 2000 and minor peaks observed in the year 1994-1996, 1997-1999, 2000-2001 and 2002-2003. Vaccination coverage over the study period was very low. The maximum coverage was 13.6% of the total cattle and buffalo population in year 1995. Difficulty in gaining access to the animals, inadequate facilities and the reluctance of owners to bring their animals for vaccination in the absence of disease might be the explanation for the observed epidemiological patterns of the disease. The rainfall seasonality combined with movement of carrier or susceptible animals appeared to be plausible explanations for the seasonal variations of HS. Furthermore, these findings suggested that since higher number of HS outbreaks appeared to occur during the 1st and followed by 4th quarter of the year, an appropriate control strategy may be to vaccinate animals before the 4th quarter of the year.
  L. Hassan , S.D. Ahmad and A. Okumus
  The genetics of plants regenerated from anther-derived callus was investigated using single crosses & inbreds of maize. Anther culture in maize (Zea mays L.) usually follows an indirect procedure involving callus induction and differentiation on at least two different media. Alternatively, development of a direct procedure by which plantlets can be regenerated directly on one medium seems desirable, if acceptable frequency of plant regeneration could be obtained and an effective procedure of chromosome doubling of regenerated plantlets is available. Yupie (YP) and N6 were used as basal media and 10 growth regulators (2,4-D, kinetin, NAA, IAA, IBA, dicamba, pCPA, 6-BA, 2ip and hypoxanthine) were tested to evaluate the feasibility of direct regeneration of haploid plantlets of eight single cross hybrids and four inbred lines. The results indicated that the direct generation of plantlets is feasible through anther culture, though it is genotype and medium dependent. Ten plantlets were regenerated directly from single cross hybrid M60 X M96. The more effective medium was N6 basal medium plus 2,4-D (2.0 mg l-1) and kinetin (1.5 mg l-1). Regeneration frequency (percent of anthers producing plantlets) ranged from 1 to 4%.
  P.K. Paul , M.S.E. Alam , L. Rahman , L. Hassan and S.K. Paul
  The soybean genotype were evaluated under different environment (Sowing dates) to determine the genotype x environment interaction vis-a-vis stability over a wide range of environment. The genotype, environment and genotype x environment interactions differed significantly for all studied characters. Considering the yield and yield contributing characters and using three stability parameters viz., phenotypic index greater than zero, regression co-efficient around unity (b = 1.0) and least deviation from regression (non-significant S2d). The lines BS-60, BS-15 and BAU-23 were found stable for plant height. The lines C.O.-1 and SAO-Luiz were identified most suitable for number of pods per plant. In case of number of seeds per pod the genotypes BAU-23 and BS-15 were observed stable but the genotype BS-12, Sohag and TGX-843, were found stable for percentage of pod per plant but the lines BS-60 and AGS-160 were found stable for 100-seed weight. It was revealed that lines BS-60 and TGX-843 were found stable for most of the characters. It is therefore suggested that the identified stable genotypes with respect of different characters might be used in breeding programme to transmit desirable trait (s) to develop stable genotype of Soybean.
  S.K. Talukder , K.M. Nasiruddin , S. Yasmin , L. Hassan and R. Begum
  The experiment was carried out in the Biotechnology Laboratories Departments of Biotechnology and Genetics & Plant Breeding, Bangladesh Agricultural University, Mymensingh during July-November 2002, to investigate the effect of BAP and NAA on orchid shoot regeneration. In this experiment shoot proliferation, root formation, leaf number, increment of shoot length and days required for shoot proliferation of orchid cultured on MS media containing different concentrations of BAP (0, 1, 2.5 and 5 mg l‾1) and NAA (0, 0.1, 0.5 and 1 mg l‾1) were observed. The results revealed that the use of different concentrations of BAP and NAA had a significant effect. Among the concentrations, the best shoot proliferation (1.90/explant), root formation (1.93/explant) leaf number (4.25/plantlet), increment of shoot length (0.472 cm) and the least time requirement for regeneration for regeneration (8.8 days) was obtained from 2.5 mg l‾1 BAP + 0.5 mg l‾1 NAA. At the same time, the lowest shoot proliferation (0.05/explant) was found in control and 0.1 mg l‾1 NAA, Leaf number (0.4/plantelt) from 5 mg l‾1 BAP, increment of shoot length (0.252 cm) from control and highest days requirement (23.8 days) from 5 mg l‾1 BAP +0.1 mg l‾1 NAA was found.
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