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Articles by M.A. Islam
Total Records ( 10 ) for M.A. Islam
  M.M. Khatun , M.A. Islam , B.K. Baek and S.I. Lee
  The study was undertaken to investigate the cellular and humoral immune responses as well as antigen recognition in the acute and sub-acute stages of Brucella abortus biotype 1 infection in Sprague-Dawley (SD) rats. The SD rats were infected intraperitoneally with 1x1010 colony forming unit (cfu) of B. abortus biotype 1 Korean bovine isolate. The cellular and humoral immune responses were measured at 0, 3, 7, 14, 21, 28, 35, 42, 60, 90 and 120 days after infection against Crude Brucella Protein (CBP) by Lymphocyte Proliferation Assay (LPA) and Indirect Enzyme-linked Immunosorbent Assay (IELISA). The experimentally infected rats developed specific lymphoproliferative and humoral immune response within 1 week post infection. A significant increase in the proliferative response to CBP was recorded on day 28 post infection. Brucella abortus specific IgG responses were initiated in SD rats at 3 days after infection. The highest IgG antibody titers were recorded at 35 days after infection and then the titer gradually decreased until the end of the experiment. Recognition of immunodominant antigens in CBP of B. abortus was performed by Western Blot (WB) assay using infected rat sera collected at 0, 3, 7, 14, 21, 28, 35, 42, 60, 90 and 120 days after infection. Western blot assay of the sera using CBP antigens revealed a wide array of protein bands between molecular weight of 19 and 125 kDa. Proteins of 125, 105, 82, 66, 54, 46, 32, 24, 22, 21 and 19 kDa were frequently recognized by the sera of infected rats during the experiment. The 82, 46, 32, 24, 22, 21 and 19 kDa proteins were intensely recognized during the course of infection. These antigens should be considered useful for the diagnostic of B. abortus infection.
  M.A. Islam , N. Absar and Abdus Salam Bhuiyan
  Two lipases designated as Lip-1 and Lip-2 were purified from dorsal part of grey mullet (Liza parsia) to homogeneity by 85% (NH4)2SO4 fractionation followed by simultaneous desalting and concentration by ultrafiltration and Sephadex G-50 and DEAE-cellulose chromotography and CM-cellulose chromotography. The molecular weight of two lipases was determined by SDS-PAGE and gel filtration about 46.5 and 41.2 KDa, respectively. Both the enzymes were dimer in nature remained unchanged the presence and absence of reducing agent under SDA-PAGE. The Lip-1 and Lip-2 lipases were active within the pH range of 7-8.5, with an optimum pH of 8 and 8.5.0 and were stable from 2.0-10.5. The enzyme was active within the temperature range of 30-60°C and maximum activities were observed around 33 and 35°C, respectively and beyond which it lost activity progressively. The hydrolytic activity was enhanced by Ca+ and EDTA (concentration 0.001-0.003 M) but strongly inhibited by heavy metal s Cd++, Zn++ and Hg++. The presence of Zn++ and Hg++ potently inhibited lipolytic activities of the lipases from grey mullet, while activities were slightly inhibited in the presence of Cu++ salts.
  M.A. Islam , P.M. Dowling , P.J. Milham , L.C. Campbell and B.C. Jacobs
  Acid tolerance of Austrodanthonia accessions was evaluated in two experiments. In the first, seeds of the 183 Austrodanthonia accessions from 15 species, two Austrodanthonia cultivars (Taranna and Bunderra) and three exotic grasses, were sown in pots containing a sandy loam soil at pHCa 3.9, 4.4 and 5.3. Seedling emergence and survival were recorded at 44 and 170 Days After Sowing (DAS) and Dry Weight (DW) at 186 DAS. In the second experiment, seedlings of 20 of the Austrodanthonia accessions and cvs used in experiment 1 were planted into a brown chromosol/brown kurosol soil located near Carcoar, New South Wales (33°37’S, 149°13’E, elevation 820 m), into areas with natural pHCa values of 4.3 or 4.9. Plant growth was monitored over 16 months. Half the planting area was pre-sprayed with glyphosate to kill the resident pasture. In experiment 1, the lowest pHCa value (3.9) severely decreased emergence, survival and DW. In experiment 2, the pHCa value of 4.3 decreased survival and DW and there was an interaction with the herbicide pre-treatment. In both experiments, there were large differences between accessions in growth potential and acid tolerance. Relative acid tolerance rankings of accessions/cvs were similar in each experiment and DW seemed to be the most reliable index of acid tolerance. The diversity of acid tolerance and growth potential in Austrodanthonia may be useful in studying the genetics of Al tolerance and in plant breeding and selection.
  M.A. Islam , Chu Chi Ming , Pogaku Ravindra and Eng-Seng Chan
  Rheological studies of boehmite sols based on pH was (1) to study the nature of flow properties of the boehmite sols and (2) to identify the sol-gel transition of boehmite sols with the change of pH of the liquid. It is evident that the shear rate and viscosity of the liquid exhibit a pseudoplastic (shear thinning) flow behavior for all pH level. The transformation of sol-gel at low pH probably due to the hydrogen bond between the layers of the boehmite structure. The temperature has an appreciable effect on the activation energy during the sol-gel transition. The flow activation energies ΔEη are in the range of 1.75 to 6.25 J mol-1 at temperature 298-384 K. Based on these results, the flow activation energy of boehmite sols sharply decreases with decreasing the pH. The flocculation of the suspension at pH 4 to 1 showed to be favourable in term of enhanced density of boehmite.
  M.N. Islam , A.A. Mahfuz , M.O. Hannan and M.A. Islam
  A study was conducted to evaluate the feasibility of using dhaincha (Sesbania aculeata) for particleboard manufacturing. The physical and mechanical properties of dhaincha particleboard were examined to assess its quality. It was found that the density of dhaincha particleboard was 602 kg m-3, the modulus of rupture was 154 kg cm-2, the modulus of elasticity was 21649 kg cm-2, the tensile strength was 9.3 kg cm-2, screw withdrawal capacity was 81 kg in edge and 82 kg in face, the surface soundness was 16 kg cm-2, the percentage swelling in thickness were 1.8 after 2 h and 9.5 after 24 h, the percentage swelling in width were 0.42 after 2 h and 0.67 after 24 h, the percentage of swelling in length were 0.35 after 2 h and 0.66 after 24 h, the absorption of water were 26.8 after 2 h and 69.49% after 24 h, the moisture content after curing was 6.5% for dhaincha particleboard. Therefore, dhaincha can be an alternative raw material for the particleboard industries.
  S.M. Asaduzzaman , M.K. Hasan , B.C. Kundu , M.A. Islam and S.M.N. Islam
  The field experiment was carried out to find a suitable and economic dose of fertilizer (combination of N, P2O5, K2O and S) for potato cultivation in no tillage mulching situation. Three fertilizer packages with a control (without fertilizer) were tested. At all locations, the treatment F4 (120, 100, 120 and 20kg ha–1 N, P2O5, K2O and S respectively, out yielded the control as well as other fertilizer doses. The tuber yield pattern due to different fertilizer packages followed the same trend for all tested locations but overall performance of Shariatpur was better than Madaripur and Gopalgong. The gross return, gross margin and marginal rate of return were also found the highest in same treatment at all the three locations.
  M.R. Karim , S.M. Asaduzzaman , F. Islam , M.A. Islam , S.M.N. Islam and Q. Naher
  Two types of fungicides and their mixture viz. Rovral, Ridomil and Rovral+Ridomil along with five combinations of different fertilizers were tested to find the best integrated package method for successful garlic production. The highest fertilizer dose especially nitrogenous fertilizer F5 (200, 166, 200, 20 and 1000 kg N, P2O5, K2O, S and Cow dung ha–1) produced the highest bulb yield of garlic (6.36 and 7.89 t ha–1 during 1997 and 1998 respectively), which was statistically similar with the yield of F4 (6.28 and 7.57 t ha–1 during 1997 and 1998 respectively) where 150, 166, 200, 20 and 1000 kg N, P2O5, K2O, S and CD ha–1 were applied. The mixed application of Rovral and Ridomil was better in case of garlic bulb yield (6.44 and 7.79 t ha–1 in 1997 and 1998 respectively). The incidence of purple blotch was significantly reduced (1.6 and 1.7 score in 1997 and 1998 respectively) by mixed application fungicide. The interaction between fertilizer and fungicide had no significant effect on garlic yield.
  S.M.N. Islam , M.A. Islam , S.M. Asaduzzaman , S.M. Zaman , A. Karim and M. Khatun
  The on-farm trial was carried out to know the effect of inter-cropping Dhanicha (Sesbania aculeata L.) with direct seeded upland rice for two consecutive years. Sole aus rice with four various populations of S. aculeata was evaluated on the basis of productivity and economic return. The results showed that although the yield of aus rice slightly reduced when S. aculeata were grown, but its seed and stick value increased much higher economic return. On the other hand, unseen benefit of S. aculeata regarding the improvement of soil health and control of insect in the rice field was emphasized. So, in the aus rice field, the population of S. aculeata (3,333 to 6,666 plants ha-1) could be grown successfully.
  M.A. Islam
  This study has been discussed about the existing Poultry products processing and marketing system, its problems and its potential solutions in Bangladesh. Traditionally chickens are sold alive till today, because of lacking trust on slaughtering method (Halal or not), fear of disease or dead birds slaughtered, lack of processing and preserving technology and skill man power. Egg grading and packing has not yet been developed. Marketing system of it is in traditional. As a result producers are not getting remunerative price that is why middleman are being gainer. Therefore modern Poultry processing plant, preserving technology and proper marketing channels are suggested to establish.
  M. Moniruzzaman , S. Akter , M.A. Islam and Z. Mia
  The microbiological status of water from dispensers in different roadside restaurants of Dhaka city and Savar area was analyzed in this study. Seven samples from Dhaka and 8 samples of Savar were checked. The heterotrophic plate count was in a range of 1.0x103 CFU mL-1 to 2.0x104 CFU mL-1 (from new bottles), 1.0x103 to 1.5x104 CFU mL-1 (after dispensation), and 1.5x103 CFU mL-1 to 1.0x105 CFU mL-1 (from serving glass). In several of the samples, the heterotrophic plate count was higher than the count in water from new bottle or after dispensation, suggesting added contamination from the serving glass. 80% of the samples were contaminated with total and fecal coliform bacteria, which render these waters unacceptable for human consumption. The samples were found to contain gram negative bacteria like E. coli, Shigella sp., Klebsiella sp., Enterobacter sp., Pseudomonas sp., and Salmonella sp., which are potential pathogens and thus pose a serious threat to public health. This study elucidates the importance of monitoring the bottling companies and the restaurants and put them under strict regulations to prevent future outbreak of any water borne diseases caused by consumption of dispensed water.
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