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Articles by M.A. Alam
Total Records ( 4 ) for M.A. Alam
  M.A. Alam , M.A. Matin , M.M. Hoque and A.T.M.R. Hoque
  The morphological characteristics of the fruits and seeds, germination and seedling growth performance of Ipil-Ipil (Leucaena leucocephala (Lam.) de wit.) were studied under different conditions in the nursery. The average length (cm), breath (cm) and number of seed per fruits varied from (19.71±0.08); (2.11±0.03) and (20.08±0.61) as well as seeds, the length (cm), breath (cm), thickness (cm) and dry weight per seeds (g) ranges from (0.83±0.03); (0.55±0.014); (0.169±0.04) and (0.059±0.002). The rate of untreated seed germination was tried in the polybag, seed tray and seedbed. The highest germination was found in polybag under peat with cowdung mixture about (66%) and lowest germination was found in seedbed in all rooting media.
  S.M. Raquibul Hasan , M.M. Hossain , R. Akter , M. Jamila , M.E.H. Mazumder , M.A. Alam , A. Faruque , S. Rana and S. Rahman
  Analgesic potential of the pet ether (PECB), chloroform (CCB), n-butanol (NBCB) and hydromethanolic (HMCB) fractions of the aerial parts of Commelina benghalensis Linn. was evaluated for centrally acting analgesic property using hotplate and tail immersion method and peripheral pharmacological actions using acetic acid-induced writhing test to scientifically validate some of the folkloric and ethnomedical uses of the plant. All fractions, at the dose of 200 and 400 mg kg-1 b.wt., displayed significant analgesic action in a dose dependent manner in the tested models. In acetic acid-induced writhing test, all extracts exhibited significant (p<0.05) reduction of writhing response in a dose dependent manner; the response decreased in the order Diclofenac-Na (76.16%) > CCB2 (68.8%) > NBCB2 (61.9%) > HMCB2 (52.8%) > PECB2 (48.0%). In hotplate and tail immersion method, all fractions caused a significant (p<0.0-0.001) increase in latency time and the results are comparable to the standard drug Nalbuphine. These results suggest significant analgesic potential of C. benghalensis and thereby justify its traditional uses in various types of pain.
  Ashfaqun Nahar , M.A.B. Siddik , M.A. Alam and M.R. Chaklader
  To elucidate genetic differentiation in three river populations (Tentulia, Paira and Kirtonkhola) of Polynemus paradiseus, ten enzymes encoded by seventeen presumptive loci were screened using allozyme electrophoresis marker, where five were polymorphic (Est-1*, Gpi-1*, Gpi-2*, G3pdh-2* and Mdh-1*). The mean proportions of polymorphic loci were observed 17.65, 29.41 and 11.76% in Tentulia, Paira and Kirtonkhola populations, respectively. The highest mean number of allele per locus and mean proportion of heterozygous loci per individual were observed in the Paira population (1.294 and 16.667%, respectively). The highest observed heterozygosity (Ho) and average expected heterozygosity (He) were 0.078 and 0.050, respectively found in Tentulia population. The highest pair-wise population differentiation (FST = 0.148) and lowest gene flow (Nm = 1.443) were found in Tentulia-Kirtonkhola indicate the close relationship among them. Based on genetic distance, UPGMA dendrogram showed that the three river populations of P. paradiseus constructed two clusters. Paira and Kirtonkhola populations made one cluster (D = 0.001) and separated from Tentulia population by the genetic distance of 0.014. The results suggested that the considerable genetic variation is maintained among the natural P. paradiseus populations.
  M.A. Alam and M.Z. Jumaat
  This study presents the results of an experimental study investigating the effect of U-shaped end anchors on flexurally strengthened reinforced concrete beams for the prevention of premature end peeling. A simple design guideline for the anchorage length of end anchor is proposed. A total of five beams, each 2300 mm long, 125 mm wide and 250 mm deep with a tension steel reinforcement ratio of 0.73%, was cast and tested. One beam was left un-strengthened and used as a control, two beams were strengthened with steel plates and the remaining two beams were strengthened with Carbon Fibre Reinforced Polymer (CFRP) laminates. One each of the steel plate and CFRP laminate strengthened beams were further strengthened with mild steel U-shape end-anchors at both ends of the beams. The beams were then tested under two-point loading. The experimental results revealed that the U-shaped end anchors of designed anchorage length eliminated premature end peeling and it had significant effects on the failure mode, ultimate load, deflections and strain characteristics of the strengthened beams. It is seen from the results that the end-anchored strengthened beams showed higher ultimate load and more ductile behaviour compared to the un-anchored strengthened beams.
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