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Articles by A. Jabbar
Total Records ( 4 ) for A. Jabbar
  A. Jabbar , T. Lihan , M.A. Mustapha , Z.A. Rahman and S.A. Rahim
  Estuarine outflow associated with suspended matter concentrations and pollutants have a major impact on marine ecosystems. Understanding the dynamics and dispersal pattern of suspended matter from river water are important for management of coastal water quality and biological productivity. This study aimed to determine the variability of Pahang River plume signature at the coastal area. One km spatial-resolution normalized water-leaving radiance, (nLw 551) obtained from the Moderate Resolution Imaging Spectroradiometer (MODIS) on Aqua satellite were analyzed from the period of 2005-2010. The plume spectral signature estimated of the backscattering coefficient nLw 551 (proxy for suspended matter) was strongly correlated with the amount of monthly average rainfall over the study period. The plume signature distributions during 2005-2010 based on nLw 551 was highly variable. During northeast monsoon, the plume tends to propagate to the south and shows the strongest plume signature of nLw 551 value (>2.0 mW cm-2 μm-1 sr-1) meanwhile during southwest monsoon the plume dispersion to the north and exhibit weakest plume signature value (<1.5 mW cm-2 μm-1 sr-1). The variability of plume signature was determined by the backscattering characteristics of surface waters in the region of the river mouth as a result of rainfall, wind stress and surface current event.
  Iftikhar A. Khan , S.S. Alam and A. Jabbar
  Fusarium oxysporum f. sp. ciceris and its phytotoxins induced the leakage of electrolytes from chickpea leaflets, A direct correlation was found between the conductivity of the leaching solution and susceptibility to chickpea wilt. The resistant varieties (CM88 and ILC-3279) released lesser amount of electrolytes as compared to the susceptible varieties (Aug-424 and ILC-1929). The losses of most of the electrolytes such as phosphates, total phenols, protein, carbohydrates, K+ and Ca+ 2 were significantly higher in toxin treated tissues than in control of both the cultivars. There was a little effect of toxin on leakage of Na+ ion in resistant or in susceptible cultivars. The susceptible cultivars released higher amount of phosphates, carbohydrates and K+/Ca+2 ions from toxin treated tissues than the resistant cultivars.
  S. Rahman , M.M. Akbor , A. Howlader and A. Jabbar
  Alkaloids are important sources of drug that’s why we have conducted our research to find out the biological activity of the alkaloids of a plant that is the Amlaki. Alkaloids were extracted from the methanolic extract of the fresh ripe fruits of Amlaki (Emblica officinalis) through solvent-solvent partitioning method with n-hexane and chloroform. The chloroform soluble fraction of the crude methanolic extract of the ripe fruits of Amlaki containing alkaloids was subjected to antimicrobial activity and brine shrimp lethality bioassay for observing cytotoxic activity. The chloroform soluble fraction of the methanolic extract exhibited significant antimicrobial activity against some Gram positive and Gram negative pathogenic bacteria and strong cytotoxicity having a LC50 of 10.257±0.770 μg mL-1. It is concluded that the chloroform soluble fraction of the ripe fruits of Amlaki containing alkaloids are biologically active.
  A.R.M. Ruhul Amin , A. Jabbar and M.A. Rashid
  Three antibiotics (RA-1, RA-2 and RA-3) were isolated from the chloroform extract of the fermentation broth of a Penicillium strain of an unidentified species. These compounds exhibited a significant in vitro antibacterial activity against both gram-positive and gram-negative organisms. The MIC values for RA-1, RA-2 and RA-3 were also determined against Bacillus subtilis, Shigella sonnei and Escherichia coli. The chloroform extract also showed strong cytotoxicity in brine shrimp lethality assay.
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