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Articles by M. R. Karim
Total Records ( 3 ) for M. R. Karim
  F. Islam , M. R. Karim , M. Shahjahan , M. O. Hoque , M. Robiul Alam and M. Akhtar Hossain
  The research work was conducted to find out the optimum plant spacing for maximizing the yield of turmeric. Four plant spacing i.e., 45 x 10, 45 x 20, 45 x 30 and 60 x 30 cm2 were considered in the study. The highest average yield (17.87 t ha-1) was obtained from 45 x 10 cm2 plant spacing which was closely followed (16.77 t ha-1) by 45 x 20 cm2 plant spacing. While the lowest average yield (13.42 t ha-1) was recorded from 60 x 30 cm2 plant spacing in respective two years. So, in agronomic point of view, 45 x 10 cm2 plant spacing is suitable but economically 45 x 20 cm2 plant spacing is viable for turmeric production.
  M. A. Bakr , M. Ahmed , M. A. Islam , M. R. Karim and M. H. U. Biswas
  BMalic acid-propane 1, 2-diol and malic acid-propane 1, 2-diol-glycerol copolyesters are synthetic polymers and it was reported that both of them are good enteric coating materials. The research work was conducted to investigate the toxicological study of both compound. The LC50 values on brine shrimp nauplii of malic acid-propane 1, 2-diol and malic acid-propane 1, 2-diol-glycerol copolyesters were found to be 5.00 μg ml-1 and 5.62 μg ml-1, respectively. It is slightly higher toxic than standard ampicillin trihydrate on brine shrimp nauplii.
  M. R. Karim and F. Hashinaga
  Limonoid glucosyltransferase (LGTase) is an enzyme in citrus that converts limonoids into corresponding glucosides and eventually reduces limonoid bitterness. Albedo from seven varieties of citrus were screened for this enzyme and its storage properties were examined. The varieties studied were Buntan (Citrus grandis Osbeck), Banpeiyu (C. grandis Osbeck), Natsudaidai (C. natsudaidai Hayata), Ponkan (C. reticulata Blanco), Iyomikan (C. iyo hort.), Meiwa kumkuat (Fortunella crassifolia Swingle) and Hassaku (C. hassaku hort.). Banpeiyu exhibited the highest specific activity followed by Buntan and Iyomikan. Banpeiyu also contained the highest amount of albedo per fruit weight followed by Buntan. Crude enzymes from all the seven varieties showed higher stability in the pH range of 5.5 to 7.5. The enzymes retained the activity up to 1 year as precipitate in ammonium sulfate while the activity lost very rapidly when stored in 10 mM Tris-HCl buffer, pH 7.5 at -20 or -80°C. Storage at 4°C in the same buffer could retain about 60% of enzyme activity only up to 10 days. Saline was the simpler and preferable medium for extraction of the enzyme. Banpeiyu and Buntan were the most suitable varieties for extracting LGTase in terms of saline extractability, specific activity, and stability of the enzyme. The pattern of protein bands in the selected varieties in terms of molecular weight were also compared.
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