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Articles by Md. Azharul Islam
Total Records ( 3 ) for Md. Azharul Islam
  Shahanara Begum , Satoshi Nakaba , Md. Azharul Islam , Yusuke Yamagishi and Ryo Funada
  Effects of low temperature on cambial cells induced by localized heating in Cryptomeria japonica and Abies firma were investigated during winter dormancy in January-February. Localized heating induced cambial reactivation in the stems earlier than natural cambial reactivation. In heated Cryptomeria japonica and Abies firma stems, cambial reactivation occurred after 6 and 2 days of heating, on 14 January 2007 and 15 January 2010, respectively. We stopped the electric heating system just after cambial reactivation in stems. When we stopped the heating system, the minimum atmospheric temperature was about 0°C. After cambial reactivation, due to rapid decrease in temperature, cell contents of cambium became coagulated but nucleus was present in ray cambial cells. After one month, the shrunk cambium produced new deformed tracheids with abnormal cell shape. The results suggest that rapid decrease in temperature just after cambial reactivation might induce temporary damage of cambium that produces deformed tracheids indicating that cambium and its derivatives can response directly to changes in temperature which provides a useful experimental model system for studies of cambial biology and xylogenesis.
  Atanu Kumar Das , Md. Azharul Islam , Md. Iftekhar Shams , Md. Obaidullah Hannan and Subir Kumar Biswas
  This study summarizes the results of Medium Density Fiberboard (MDF) made from bagasse using urea formaldehyde as a binder agent and without binding agent. Important physical and mechanical properties were examined. The density of MDF bagasse with binding agent and without binding agent was respectively 0.90 and 0.87 g cm-3. The Modulus of Rupture (MOR) of MDF bagasse with binding agent and without binding agent was 44.98 and 34.94 N mm-2 respectively. The Modulus of Elasticity (MOE) was 3532.34 and 3454.28 N mm-2 respectively for UF bonded bagasse MDF and without binding agent bagasse MDF. Board with addition of binding agent showed higher performance than that of without binding agent board for both physical and mechanical properties. But both kind of board followed the standard and also showed better quality than that of the previous studies. There is a possibility of using MDF of bagasse for both types as a substitute of MDF made from other agricultural residues.
  Shahanara Begum , Md. Azharul Islam and A.K.M. Azad-ud-doula Prodhan
  Anatomical investigation has been made on the stem of pigeonpea (Cajanas cajan (L.) Millsp.) at different stages of growth following the standard paraffin method of microtechnique. The vascular bundle of the stem are collateral and arranged in a ring. The cambium initiates in the primary vascular bundle between xylem and phloem at the basal part of the stem of 3 days old plant. After the formation of fascicular cambium it gives rise to secondary xylem adaxially and secondary phloem abaxially. Most of the vessel members are solitary and few are paired while others are multiple. The solitary vessel members are more in mature stem as compared to that of the younger stem. The well developed periderm was found in mature stem. The pith resembles a typical dicotyledonous stem.
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