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Articles by S. Islam
Total Records ( 7 ) for S. Islam
  M.R. Islam , M. Jahiruddin and S. Islam
  The levels of arsenic in irrigation waters (STW), soils and rice plants (grain and straw) in five districts viz., Pabna, Chapai Nawabganj, Rajbari, Faridpur and Gopalganj of the Gangetic floodplains of Bangladesh were assessed during the year 2001. The arsenic concentrations for all samples (soil, water, grain and straw) varied considerably between locations. Generally, the arsenic levels in soils and waters were higher in Rajbari and Faridpur compared to the other three districts. There was a good correlation between water-As and soil-As over the locations. None of the soils had arsenic level more than 20 μg g-1 (the maximum acceptable limit for agricultural soils). About 16% grain samples had no detectable As and on the other hand 14% grains had As level more than 1 ppm. Comparing varietal effects, the grain As concentration in IR 8 and BRRI dhan 29 rice were higher in comparison with BRRI dhan 28 and Parija. There was no correlation between rice grain As and soil As content. The As concentrations were always lower in grain than in straw.
  F. Begum , M.N. Amin , S. Islam and M.A.K. Azad
  Nodal segments of in vitro germinated seedlings of three pummelo varieties [Var.-1 (pulp is pink colour), Var.-2 (pulp is white colour) and Var.-3 (pulp is red colour)] were cultured on half-strength MS medium for axillary shoot proliferation. A large number of shoot buds were produced when such four weeks old culture were subcultured on half-strength MS medium containing 1.0 mg l-1 BAP. Roots were induced when the isolated individual shoots were cultured on half-strength MS medium containing 0.1 mg l-1 each of NAA, IBA or IAA. Cent percent root were observed on half-strength MS medium having 0.1 mg l-1 NAA. These in vitro grown plantlets were then successfully transferred to outside natural condition through successive phases of acclimatization. About 93% of the regenerated plantlets survived under ex vitro condition.
  M.Z. Karim , M.N. Amin , M.A. Hossain , S. Islam , Faruk Hossin and R. Alam
  Protocol for induction of callus and regeneration response of two sugarcane varieties (Isd-16, Isd-28) was established through callus culture using leaf sheath. Multiple shoot regeneration at various frequencies was observed using different concentrations and combinations of growth regulators. The highest percentage of callus induction was observed in the medium containing 3.0 mg l -1 2,4-D with 10% coconut water (CM). The best response in terms of multiple shoot formation was observed that on MS medium supplemented with BAP 1.0 mg l -1 +IBA 0.5 mg l -1. NAA (3.0 mg l -1) was found effective in the production of roots. The variety Isd-16 showed better response than the variety Isd-28 towards shoot multiplication. Seventy percent of the plantlets produced from in vitro culture method survived in the ex vitro condition.
  F. Begum , M.N. Amin , S. Islam , M.A.K. Azad and M.M. Rehman
  Cotyledon explants from in vitro grown seedlings were cultured on half-strength of MS medium with different growth regulators for in vitro indirect regeneration of shoots. Optimum callus formation, when cotyledon explants were cultured on MS containing 1.0 mg l-1 BAP with 5.0 mg l-1 NAA. After that the calli were used for shoot regeneration by transferring them half-strength MS medium supplemented with only cytokinin. Maximum percentage of shoot regeneration was obtained on half strength MS medium in the presence of 1.0 mg l-1 BAP from callus in three varieties [Var.-1 (pink colour), Var.-2 (white colour) and Var.-3 (red colour)] of pummelo. For rooting, shoot cuttings were cultured on half strength MS salts with 0.1-1.0 mg l-1 NAA, IBA or IAA. The best and healthy rooting was observed on 0.1 mg l-1 NAA. The plantlets of three varieties were successfully established on soil. About 95% of plantlets survived under ex vitro condition.
  M.R. Islam , S. Islam , M. Jahiruddin and M.A. Islam
  A pot culture experiment was carried out at Bangladesh Agricultural University (BAU), Mymensingh to see the effects irrigation water arsenic (As) on Boro rice (February to June) and the residual effect on T. Aman rice (August-November). There were eight treatments consisting of Control, 0.10, 0.25, 0.50, 0.75, 1.00, 1.50 and 2.00 ppm As added through irrigation water. A total of 56 L of irrigation water having different concentrations of As was needed for the Boro rice (Cv. BRRI dhan 29). After harvest of Boro rice, T. Aman rice (Cv. BRRI dhan 33) was grown in the same pots with monsoon rain. Nutrients such as N, P, K and S @ 100, 25, 40 and 25 ppm, respectively were added to sustain normal growth of both Boro and T. Aman rice. The irrigation water added As up to 0.25 ppm enhanced the plant height, panicle length, filled grains/panicle, 1000-grain weight and finally the grain yield of Boro rice and the further doses of depressed the plant growth, yield and yield components. The concentration of As in rice grain or straw of Boro rice increased significantly with increasing As concentrations in the irrigation water, the values for grain As for every As treatment were below the Maximum Permissible Level (1.0 ppm). Application of As added to the first crop (Boro rice) had significant residual effects on the second crop (T. Aman rice) in respect of plant height, panicle length, grains/panicle, grain and straw yields. Arsenic concentrations were always higher in Boro rice grain and straw compared to T. Aman rice. The grain As of Boro rice was almost double the As levels in T. Aman rice grain over the treatments. The As treatments had an adverse effect on the N, P, K and S concentration of rice grain.
  Aly Khan , S.S. Shaukat , F. Qamar , S. Islam , A.A. Hakro and A.H. Jaffry
  The effect of three organic amendments including poultry manure, pigeon manure and sawdust and carbofuran on the population of Tylenchorhynchus curvus, Helicotylenchus indicus and Meloidogyne sp., larvae associated with chilli and the chilli yield were investigated. Population densities of the nematodes were reduced by the organic amendments to varied extent. Poultry manure caused greatest reduction of nematode populations. Yield of chilli was remarkably increased by poultry manure and carbofuran.
  Sarder Nasir Uddin , A.M. Hasan , M.R. Anower , M.A. Salam , M. J. Alam and S. Islam
  Until the advent of genetic engineering, enzyme producers were limited in their ability to produce innovative products for the marketplace. They were constrained to isolate enzymes from organisms approved for the industrial use. The desired characteristics could be enhanced only using classical in lit agenesis techniques. When these methods failed, no alternatives were available. Commercialization depended on incremental yield improvements gained by continuous programs of strain development. The ability to use recombinant DNA (rDNA) techniques has removed many of these barriers. Enzyme producers recognized early the potential for commercialization new products using genetic manipulation. They worked with a wide variety of single-celled organisms that were simpler and thus, easier to understand then the higher orders of plants and animals. The organisms already were well characterized for growth and expression rates. Short life cycles allowed rapid testing. These systems were ideal for genetic manipulation using rDNA techniques. Genetic engineering, combined with an understanding of biocatalysts to predict alterations for enzyme improvements, is revolutionizing the production and use of enzymes in the marketplace. Offering a recombinant produced product represents the culmination of a long and complex effort on the part of a multitude of disciplines: molecular and microbiology, X-ray crystallography, enzymology, protein and organic chemistry, biochemistry, fermentation and formulation engineering, assay chemistry and technical service/applications, marketing, sales. Because of the variety of disciplines required, a critical mass is needed to innovate products successfully and them to market. The continued proliferation of novel enzyme products requires development of core technologies so complex and expensive that they can be justified only rDNA technology must consider regulatory issues, ownership protection and consumer acceptance.
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