Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
Articles by M. Shahjahan
Total Records ( 8 ) for M. Shahjahan
  Narayan Roy Md Belaluddin and M. Shahjahan
  Three xylanase-producing Aeromonas strains (St1, So1 and So2) were isolated from stagnant water from Rajshahi University campus. The strains were isolated on xylan agar media and screened by -xylanolysis method. This strains showed drug resistance to cotrimoxazole, ampicilline and amoxycilline when tested by disc diffusion method on nutrient agar or xylan agar plate respectively. This strains also showed sensitive to erythromycin, tetracycline and doxycyclin. The minimum inhibitory concentration (MIC) of erythromycin, tetracycline and doxycyclin was determined by serial dilution technique against three test bacterial strains. The MIC values of the above three drugs against St1 were 250, 125 and 250 μg ml-1, against So1 and So2 were 125, 62.5 and 125 μg ml-1 respectively. Plasmid DNA was isolated the multi-drug resistant strain St1. These drug resistant plasmids were transformed into sensitive E. coli LE 392. The transformed LE392 became resistant to cotrimoxazole, ampicilline and amoxycilline and the respective plasmid DNA was detected in the plasmid DNA isolated from transformed E. coli cells. The antibiotic resistant in Aeromonas was plasmid born.
  M.M.R. Chowdhury , M. Shahjahan , M.S. Rahman and M. Sadiqul Islam
  An experiment on duckweed (Lemna minor) as supplementary feed in monoculture of nile tilapia (Oreochromis niloticus) was conducted for a period of 90 days. The experiment had two treatments each with three replications. In treatment-1 ponds were supplied with duckweed as supplementary fish feed and in treatment-2 ponds were kept as control (without supply of duckweed). Ponds were stocked at a stocking density of 80 fingerlings per decimal. The ponds were fertilized fortnightly with poultry dropping at the rate of 5 kg decimal-1, urea 60 g decimal-1 and TSP 90 g decimal-1. Duckweeds were supplied to the ponds (treatment-1) at the rate of 60% of the total body weight (wet weight basis) of the fish. During the experimental period, the ranges of physico-chemical parameters viz., water temperature, transparency, dissolved oxygen, pH, total alkalinity, free CO2, PO4-P and NO3-N were within the productive limit and more or less similar in all the ponds under treatments 1 and 2. There were 27 genera of phytoplankton under five major groups and 11 genera of zooplankton under three major groups were found in the experimental ponds. Mean survival rates in treatments 1 and 2 were 94.37 and 93.75%, respectively. Specific growth rate (SGR, % per day) of the fish in treatments 1 and 2 were 1.16 and 0.80%, respectively. Calculated net production of the fish in treatment-1 was 16.28 kg decimal-1 year-1 and in treatment-2 was 8.92 kg decimal-1 year-1. By t test it was found that the net production of fish in treatment-1 was significantly (p< 0.05) higher than that of treatment-2.
  Ibrahim Shehu Jega , M. Idris Miah , Nahida Arfin Huda , M. Atiqur Rahman , Mst. Kaniz Fatema , M. Mahfujul Haque and M. Shahjahan
  Background and Objective: Knowledge of reproductive biology of a fish species is particularly important for conservation and plays significant role in determining its sustainable management and suitability for culture. Aspects of reproductive biology of Hemibagrus menoda from Kangsha River Netrakona district, Bangladesh were studied to evaluate the on-set and period of spawning season and its reproductive potential, which were hitherto not reported. Materials and Methods: A total of 479 females and 400 males were collected using Gill nets and Seine nets from March, 2015 to February, 2016. Gonadosomatic index (GSI), fecundity and histology of the gonads were investigated. Regression analysis was used to estimate the relationships between fecundity and standard length (SL), fecundity and body weight (BW) and fecundity and ovary weight (OW). Results: The monthly mean GSI of female H. menoda started to increase from May to June and reached the peak (12.50±4.97) in July, indicating the peak spawning season of the fish. Mean fecundity estimates based on mature females was 77273.77±276.82 for fishes with mean length of 31.85±2.39 cm and ranged from 22954.99; 25.00 (cm) in May to 222171.8; 40.20 (cm) in July. Fecundity correlated positively with SL (Log F = 0.0135+4.399 log SL; r2 = 0.774), BW (F = 198.7 BW-47602; r2 = 0.805) and OW (F = 1066 OW+6124; r2 = 0.832). Based on histological data, yolk vesicle, premature and mature stages of oocytes were abundant in May, June and July, which further confirms the distinct spawning season of H. menoda from May to July. Conclusion: Hemibagrus menoda spawns once a year and the spawning season extends from May to July with a peak in July. This reproductive pattern helps in development of culture program and conservation of the species.
  M. Shahjahan , M.I. Miah and M.M. Haque
  A field study was conducted on the hydrographic parameters, types of fishing gears used, catch assessment survey (CAS) and species composition of fish of the Jamuna River adjacent to the Dhunat upazilla under the district Bogra. The study was conducted from July to October, 2000. Hydrographic parameters were in the suitable ranges for fish. Various types of fishing gears were found to operate in this river, they were broadly classified into 3 groups, such as, nets, traps and wounding gears. A total of 5 types of nets, 2 types of traps and 1 type of wounding gear were recorded. A total of 38 species of fish were identified in the catches of different gears used by the fishermen. Among the different types of nets, the highest number of species (25) were recorded in catches of ber jal (sein net), which was followed by jhaki jal cast net (18) and relatively less number of species (7) were recorded in the catches of thella jal (push net).
  M. Mofazzel Hossain , M. Shahjahan , A.K.M. Azad-ud-doula Prodhan , M. Sirajul Islam and M. A. Begum
  Resistance or susceptibility of brinjal varieties/lines to shoot and fruit borer seems to be related with some anatomical characters. Varieties/lines having thick cuticle, broad and thick collenchymatous area (hypodermis), compact parenchyma cells in the cortical tissue, small area in the cortical tissues, more vascular bundles with narrower spaces in the interfascicular region, and compact arrangement of vascular tissue with lignified cells and small pith were the main characters of resistant/tolerant varieties. On the other hand, thinner cuticle and collenchymatous area (hypodermis), loose parenchyma cells in the cortical region, larger spaces between vascular bundles i.e., interfascicular region and large pith, less number of trichomes, soft parenchymatous cells in the interfascicular region, might be responsible for the susceptibility to brinjal shoot and fruit borer.
  M. Robiul Alam , M.S.H. Molla , M. Shahjahan , M.O. Hoque , M. Akhtar Hossain and F. Islam
  The research work was conducted to observe weed vegetation and to ascertain the comparative control efficiency of weeding methods in upland direct seeded Aus rice. Weed density was affected significantly by weeding methods at 60 days after sowing. The highest weed density (149.14 m–2) was observed in control plot. The lowest weed density (77.64 m–2) was recorded in T6 (ronstar @ 2.5 L ha–1) treatment and the second lowest density of weed was attained from T5 (ronstar @ 2.0 L ha–1) and T2 (Two hand weeding) treatment. Most of the weed species infested in experimental plots were graded as good control in T6 (ronstar @ 2.5 L ha–1), T5 (2.0 L ha–1) and T2 treatment. But the application of ronstar @ 2.5 L ha–1 resulted in phytotoxic effect and rice plants were short statured and flowering was delayed. Moreover conventional two hand weeding method was observed very much laborious, time consuming and less cost effective for controlling the weeds. It was evident that the application of ronstar @ 2.0 L ha–1 was found the easiest and economically viable method for controlling different weed species grown in upland direct seeded Aus rice.
  Muhammed Saiful Islam , M. Shahjahan , Mohammad Abdul Motaleb and Md. Abdul Hye
  The acetone, ethanol, methanol and water extracts of bitter gourd, karanja, mehedi, and urmoi, leaf and seed/bark were evaluated for their growth inhibition, and grain protection effect against granary weevil, Sitophilus granarius L. The highest reduction in number of adults was in urmoi followed by karanja, bitter gourd and mehedi extracts. Extracts of all the four plants showed grain protective effects up to 30 DAT, though the effects of different plant extracts lost gradually with the increase in duration. In most of the cases the extracts of ethanol were more effective than those of other three solvents. The seed extracts were more effective than leaf. Efficacy of the extracts increased proportionally with the increase in doses and decreases proportionally with the increase in time. The extracts did not show any adverse effect on germination capability of wheat seeds even after 3 months of treatments.
  M. Mofazzel Hossain , M. Shahjahan , M. Abdus Salam and M.A. Begum
  Twenty varieties and lines of brinjal were screened out to observe their resistance level to brinjal shoot and fruit borer Leucinodes orbonalis Guenee (Pyralidae:Lepidoptera) infestation in the field conditions. The infestation varied significantly among the varieties/ lines. The brinjal shoot and fruit borer infestations for different varieties/lines were found in the following order of intensity: Nayankajal >BL095 >BL085 >BL098 >BL0 114 >Khotkhotia-2 >Borka >Laffa >Islampuri >BL045 >Dhohazari-2 >BLO101 >Dhohazari-1 >Khotkhotia-1 >BL096 > Sada ball > Singnath > Uttara > Baromashi > Jhumki. Varietal resistance of brinjal against brinjal shoot and fruit borer indicated significant variations among different brinjal varieties/line. Plant age had significant effect on the incidence of brinjal shoot and fruit borer. Highest percentage (32.89) of brinjal shoot and fruit borer infestation was observed at 70 DAT and lowest (5.18) was found at 40 DAT. The rate of infestation gradually increased with the increase of plant age and then decreased in 100 DAT. Highest percentage of infestation was observed in 70 DAT, which was significantly different from 40 DAT but identical with 100 DAT.
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility