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Articles by M.A. Hoque
Total Records ( 6 ) for M.A. Hoque
  M.M. Rashid , M.A. Hoque , K.S. Huque and A.K.F.H. Bhuiyan
  The objective was to evaluate the effects of genotype×environment interaction on growth traits of Brahman crossbred cattle. The animals were reared in two environments viz., Central Cattle Breeding Station (on-station) and farmer’s herd (on-farm) where management system was respectively intensive and semi-intensive in nature. Birth weight was very similar across environments. Average body weight at different ages was greater in on-station herd than in on-farm herd (p<0.01). Body weight was 23.0, 25.4, 41.5 and 27.5 kg greater at 6, 9, 12 and 18 month in on-station herd than in the on-farm herd, respectively. Significant interaction between sire×environment in most of the growth traits (p<0.001) was observed. Heritability estimates for growth traits were greater in on-station herd (ranged from 0.29-0.47) than in on-farm herd (ranged from 0.48-0.50). Genetic correlations of the same growth trait between two environments showed a decreasing tendency with the increase in age of animal (from 0.74±0.05 at 3 months to 0.57±0.05 at 24 months). These results demonstrate that effects of G×E in Brahman crossbred cattle are large between two types of management system indicating that breeding bull selection and use should be carried out within environment basis.
  M. Aminul Haque , M.A. Hoque , Sukanta Saha and Md. Hadiuzzaman
  The research focuses on the solidification/stabilization of heavy metal contaminated landfill Decomposed Solid Waste (DSW). DSW samples were collected from Matuail and Aminbazar landfill sites of Dhaka South City Corporation and Dhaka North City Corporation respectively. Ordinary Portland Cement (OPC) was used as stabilizing binder to investigate the feasibility of solidifying/stabilizing the waste. A series of trials were observed for optimum composition of OPC and fine aggregate in mortar mixture. Solid waste was mixed as the substitute of total volume of fine aggregate as big as 10-70%, with the range of 10% per composition. The study observed the strength development and immobilization of heavy metals like Fe, Cu and Ni of the final product. This study revealed that 30% of the total volume of the fine aggregate can be replaced by dry decomposed solid waste having a mix proportion 1:3 of stabilizing binder (i.e., OPC) and fine aggregate which obtained compressive strength 2494 psi at 28 days curing period that satisfy the Bangladesh standard for paving block. Immobilization of Fe, Cu and Ni were obtained ranges from 96.5-95.0, 88.16-72.64 and 93.05-89.28%, respectively for different composition of solidified matrix. The Outcome of this study gives the information of compressive strength development of solidified waste mortar block and immobilization (i.e., entrap) of heavy metals within the block to minimize the release into the environment.
  F. Nikkon , S. Hasan , M.H. Rahman , M.A. Hoque , A. Mosaddik and M.E. Haque
  Two triterpenes, β-Amyrin and 12-Oleanene 3β, 21β-diol, were isolated as a mixture from the chloroform soluble fraction of an ethanolic extract of Duranta repens stem. The structures of these two compounds were confirmed by IR, 1H and 13C-NMR spectral data. In acute toxicity test, the chloroform soluble fraction showed toxic effect on rats but compound 1 (mixture of β-Amyrin and 12-Oleanene 3β, 21β-diol) had no toxic effect on rat at 2 mg/kg/day b.wt. Biochemical and hematological profiles of rat`s blood of chloroform soluble fraction were found statistically significant. In histopathological experiment, some degenerative changes on cellular structure of liver, heart and kidney except lungs were found in chloroform soluble fraction treated rats.
  M.A. Hoque , V. Aravinthan , N.M. Pradhan and A. Sakhiya
  Off-line analysis of liquid phase samples have traditionally been used for the determination of organics and nitrogen load for process control or optimization in full-scale wastewater treatment plants. However, these sampling and analysis methods are labor-intensive and time-consuming. Besides, the results are not generally available on real-time to the operators who struggle on daily basis to meet the constant discharge license conditions of the effluent while the influent conditions change diurnally with varying loads. Combined respirometric titrimetric sensor is an on-line method that has been developed recently, indicating the oxygen demand exerted by organic and nitrogen loadings. This sensor monitors both the oxygen uptake as well as the proton production/consumption resulting from the biological reactions in activated sludge system. The basic-data can then be interpreted to find out the short-term BOD which can be used effectively for process control and optimization. Data interpretation and model development are still in progress as researchers keep on unraveling the mystery of how the substrates are biodegraded by activated sludge. Hence, in this study, it is aimed to develop an in-depth understanding about the aerobic biodegradation process using real-time biosensors through addition of different substrates such as acetate, surfactant (SDS) and ammonium to batch cultures of activated sludge by maintaining the pH of 7.8. Basic data interpretation was carried out to calculate Oxygen Uptake Rate (OUR) as well as proton production/consumption rate from the raw data. Besides, the improved bio-kinetic model calibration was presented in this study explaining the oxidation of different substrates in activated sludge system.
  M.A. Hoque , H.M. Salim , G.K. Debnath , M.A. Rahman and A.K.M. Saifuddin
  To evaluate the success rate of artificial insemination and average service required per conception of cows inseminated in different AI points of sub centers under Chittagong and Cox’s Bazar District of Bangladesh, last three years AI records were analyzed and interpreted. The lowest and highest conception rates in different points under Pahartali sub center were recorded to be 55 and 73%, respectively during 1998-1999; the same results being obtained during 1999-2001; 55 and 66%, respectively during 2000-2001. The lowest and highest average services required per conception of cows inseminated in these points was 1.3 and 1.8, respectively. On the contrary the lowest and highest conception rates were 41 and 42% during 1998-99 and the following year (1999-2000) with an improvement to 46 and 55 % during 2000- 2001 period, respectively in points under Shandip sub-center. The lowest and highest average service per conception were between 1.8 and 2.4 during the said period. The lowest and highest conception rate and average service per conception were obtained from different points of Cox’s Bazar sub center where 59 and 64%, 50 and 72%, 50 and 77% conception rates; and 1.6-1.7, 1.4-2.0, 1.3-2.0 average services per conception during the period of 1998-1999, 1999-2000 and 2000-2001 were recorded, respectively. These differences were proved to be statistically significant. The difference in successful conception rates between Shandip and Pahartali Sub center; and Shandip and Cox’s Bazar sub center during 1998-1999, 1999-2000, 2000-2001 period were also found statistically significant. However, as the overall (1998-2001) conception rates were compared between Shandip and Pahartali and Shandip and Cox’s Bazar, there were shown statistically insignificant. The overall conception rates and average services per conception to the animal of 1998-2001 were found to be significant as well.
  M.A. Hoque , D.H. Baik , M.S. Hussen and M.S. Rahman
  This experiment was conducted with 21,153 cows and heifers of 3 (three) genetic groups viz. Pabna (PB), PabnaxSahiwal (PBxSL) and PabnaxFriesian (PBxFN) inseminated with frozen semen of Sahiwal (SL), Friesian (FN) and SahiwalxFriesian (SLxFN) bulls to investigate the effects of breeding groups and environmental factors on conception rate (CR). Among the factors considered, it was reflected that parity of dam (p<0.05), time of insemination (P<0.01), season of insemination (p<0.05) and all interactions (p<0.05) had significant effects on CR. The highest CR were found for cows in 0 parity (heifer) (52.11%) or cows inseminated in spring season (51.30%) or inseminated between 8 to 14 hours after onset of estrus (53.24%). The highest CR were also observed in the interaction effects of PBxFN damsxSL sires (52.75%) or SL siresxspring season (52.17%) or PBxFN damsxwinter season (52.21%) or cows inseminated within 8 to 14 hours after the onset of estrusxspring season (54.55%)-indicating that combination of inseminating dams in right time of estrus using appropriate sire in appropriate season would contribute greatly to improve the status of CR in PB and its crossbred with SL and FN cows of Bangladesh.
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