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Articles by M.R. Karim
Total Records ( 4 ) for M.R. Karim
  M.A. Hossain , M.R. Karim , S. Begum , M.A. Hossain and M.A. Haque
  Experiment was carried out to investigate the effect of cephalexin on sex expression, fruit setting, fruit development and yield of cucumber. Cucumber was grown in the field at natural condition and treated with cephalexin solutions of 0,12.5, 25, 50, 75 and 100 ppm at seedling stage (2-true leaf stage). Data were collected on number of male flowers/plant, number of female flowers/plant, number of fruits/plant, days to first male flowers, days to first female flowers, % fruit setting, fruit size, fruit weight and fruit yield/plant. The results revealed that foliar application of cephalexin changed the growth habit of cucumber reducing the vegetative phase and extending flowering phase of the plant. The lowest vegetative phase (30.3 days) and the highest reproductive phase (65 days) was found in the plants treated with 50 ppm cephalexin. It suppressed the production of male flowers but increased the number of female flowers thereby subsiding the ratio of male to female flowers. Cephalexin significantly increased the fruit setting over control with the highest (68.7%) in 50 ppm. It also increased the fruit length, girth, weight and ultimately total yield/plant by 48.0, 55.0, 52.6 and 172.2%, respectively, in 50 ppm treatment.
  M.A. Habib , M.A.R. Sarker , M.R. Uddin , M.R. Karim and M.A. Hossain
  The experiment was conducted to examine the effect of rate and time of nitrogen application and their interaction on late transplant aman rice (cv. BR23) and comprised of four nitrogen rates and five timing of nitrogen application. Application of N-fertilizer @ 100 kg ha -1 produced the highest plant height, number of bearing tillers hill -1, panicle length, number of grains panicle -1, number of sterile spikelets panicle -1,1000-grain weight, grain yield, straw yield and biological yield which were similar to that of the plants fertilized with 80 kg N ha -1. Minimum values of the aforesaid parameters were observed in all plots when the crop was not fertilized with nitrogen. Nitrogen rate increased grain and straw yield up to the highest rate of nitrogen. The highest grain and straw yields were obtained from three equal split application of nitrogen at basal, early tillering and panicle initiation stages. Yield attributes like, number of total tillers hill -1, number of bearing tillers hill -1, panicle length, number of grains panicle -1, biological yield and harvest index were also increased in three equal split application compared to two split application of nitrogen. Interaction between rate and time of nitrogen application also significantly influenced the number of tillers hill -1, grain yield and harvest index. The highest grain yield obtained from the application of 100 kg N ha -1 in three equal splits at basal, early tillering and panicle initiation stages. Yield parameters were not significantly influenced by the interaction between rate and time of nitrogen application.
  F. Pervin , M.M. Hossain , S. Khatun , S.P. Siddique , K.A. Salam , M.R. Karim and N. Absar
  Six bioactive lectins were purified from the rootstock of Pondweeds (Potamogeton nodosus Poir) by conventional chromatographic methods. They showed cytotoxic effect in brine shrimp (Artemia salina L.) lethality bioassay. The LD-50 values of PNL-1, PNL-2, PNL-3, PNL-4, PNL-5 and PNL-6 were found to be 10.76, 7.03, 17.25, 10.52, 19.60 and 20.1 μg mL-1, respectively which implied that they have significant uses specially of PNL-2. Experimental results revealed that PNL-2 and PNL-4 were more cytotoxic than other lectins.
  M.Z. Rahman , Z.A. Saud , N. Absar , M.R. Karim and F. Hashinaga
  Two different amylase from the flesh of healthy and fruit-rot disease-affected Moringa fruit were purified by successive chromatography of the crude enzyme extract on DEAE-cellulose followed by CM-cellulose and were purified 46- and 50-fold respectively. Both the enzymes appeared to be homogeneous as judged by polyacrylamide gel electrophoresis. Molecular weights of amylases from healthy and diseased Moringa estimated by gel filtration were 59 kDa and 66.5 kDa respectively. The purified enzymes were classified as -amylase and consist of a single polypeptide chain. The amylase from healthy and diseased Moringa flesh showed the following characteristics: pH optima, 6.8 and 6.4; temperature optima, 38 °C and 40 °C; Km value, 0.28 and 0.22% for starch as substrate respectively.
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