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 S.U. Ahmed
Total Records ( 8 ) for S.U. Ahmed
  H. Das , S.U. Ahmed , S.K. Shukla , S. Shukla , A. Latif and D. Sharma
  Mastitis represents a failure of innate immune mechanism of udder teat canal epithelial cells and peripheral PMN cells, whose cationic peptides constituted innate immunity. An attempt was made to examine in the year 2007, the actual presence of β-defensins peptides in milk of mastitis-affected buffalo (Bubalus bubalis), due to lack of such information. AU-PAGE revealed higher frequency and density of the peptides in case of mastitis milk as compared to normal milk sample, particularly in the most cationic zone with highest electrophoretic mobility or lower molecular weight region. These low molecular peptides were also separated out using 10 kDa cut-off membrane ultra filtration, which was subsequently examined for in vitro antibacterial sensitivity and subjected to SDS-PAGE and low molecular weight zone was further subjected to MALDI-TOF mass spectrometry, which identified the most anodic two peptides of about 5 kDa as β-defensin viz. The LAP (lingual antibiotic peptide) and BNBD-2 (bovine neutrophil beta-defensin-2) based on amino acid sequences unlike that of healthy buffalo milk. Sequence homology studies also supported mass spectrometry data as both the peptides shared 100 and 98.5% identities with cattle β-defensins, respectively. Antibacterial assay against S. aureus and E. coli revealed significant activity of these peptides against both gram-positive and gram-negative organisms at 10 μg concentration. It is concluded that expression of β-defensin peptides in ductal epithelium were induced in mastitis and these defensin peptides were also released into the milk.
  S.U. Ahmed , M.S. Rahman and M.S.A. Khan
  A study was undertaken to find out the effect of fertlization on the fatty acid profile of Artemia cysts (GSL strain, Utah, USA origin) produced from the modified traditional solar salt works of Bangladesh during winter months (January-March) through different fertilization treatments (T1,T2,T3). Application of fertilizer for T1 was 50 kg urea + 20 kg TSP/ha, T2 was 500 kg dried and powdered chicken manure/ha and T3 was 1000 kg dried and powdered chicken manure/ha with dress up weekly/bi-weekly fertilization in all the cases. Palmitic, Linolenic, Eicosapantaenonic and Docohexaenoic acids (mg/g.DW) were found highest for the cysts in T1 (16.0±1.36%), T2 (14.7±0.47%), T2 (4.7±0.40%) and T2 (0.7±0.06%) treatments, respectively. High amount of 18:3(n-3) acids in the cysts of all sources proves to be freshwater type of the cysts. The presence of marine type essential fatty acids in the cysts of all sources were found low for 20:5n-3 (3.7-4.7%) and very low for 22:6n-3 (0.09-0.7%). No significant variation was observed for 16:0 acids within the treatments, but for 18:3(n-3) acid, the variation was found highly significant (P= 0.0052) between T2 and T3. For 20:5(n-3), only variation between T2 and T3 was found insignificant (P=0.1161), but between other treatments, significant variation was observed between T2 and T3 (P=0.0241), T2 and T3 (P=0.0022) and T1 andT3 (P=0.0161).
  M.R. Saha , M.M. Rahman , S.U. Ahmed , S. Rahman and H.K. Pal
  A study was undertaken to evaluate the effect of stocking density on brood stock development of mud crab (Scylla serrate) in brackishwater earthen ponds. Four stocking densities such as 6000/ha (T1); 8000/ha (T2); 10000/ha (T3) and 12000/ha (T4) were tested and the crabs were allowed to fed with 50% slaughterhouse+25 percent tilapia (Oriochromis niloticus)+25% soft shrimp head. In terms of survival rate (both male and female) the stocking density having 6000/ha showed the best performance. For female crab significant lower survival (p<0.05) was observed for T3 and T4 compare to T1 and T2. But for final growth and carapace width, an insignificant variation was noted among the treatments. However, in case of T1 and T2, 2.5-3.0 percent of females were found to became berried showing significant variation with other two treatments proved that high stocking has inverse effect on brood development.
  S.U. Ahmed , M.S. Ali , M.S. Islam and P.K. Roy
  A three and half month study was undertaken to evaluate the effect of culture management and stocking density on the growth and survival of Penaeus monodon in semi-intensive system of farming. Three treatments with stocking densities of 20 PL/m2, 25 PL/m2 and 30 PL/m2 wereapplied and considered as treatment T1, T2 and T3, respectively. All the ponds were supplied with commercial pelleted feed of different grades and amount (ranging from 10 to 2.8 percent of total biomass weight) based on the age and growth of shrimp. A significant (p<0.05) higher production (3876.66 kg/ha) was obtained from T2 and the study showed a positive correlation between the culture managed of shrimp farm and the shrimp production and an inverse relation between stocking density and survival rate.
  M.N. Islam , M.N. Islam , S.U. Ahmed , M.M. Hossain and S. Chowdhury
  The effect of mulch and bulb size on the growth of onion was studied using four mulch treatments, viz., non-mulch i.e. control, ridge method of mulch, straw and black polyethylene mulch; and five different sizes of seed bulbs, viz., very small (0.5 g), small (1.0 g), medium (1.5 g), large (2.5 g) and very large (4.5 g). Mulching and bulb size had significant effect on plant height, leaf number, pseudostem diameter, root number and length. The interaction effect of mulch and bulb size was significant in plant height, root length and root number but it was non-significant in leaf number and pseudostem diameter.
  M.K. Islam , M.A. Awal , S.U. Ahmed and M.A. Baten
  Influence of two set sizes viz. 1.6 and 2.44 g/set, three plant spacings viz. 20cm x 10cm, 20cm x 15cm and 20cm x 20 cm and four doses of N viz. 0, 60,120 and 180 kg/ha on the growth and bulb yield of onion was studied. Larger set produced the highest bulb yield (22.6 t/ha) over smaller one (19.9 t/ha) . Smaller set gave more number of single bulbs and took shorter growing period. The closest spacing produced the maximum number of single bulbs (31.6%) and the highest bulb yield (23.7 t/ha). N at zero level gave the highest number of single bulbs. N at 120 kg/ha produced the maximum bulb yield (28.5 t/ha), but N at 180 kg/ha gave the highest plant height and required the longest growing period. Interaction effects of all possible combinations caused significant variation on bulb yield and related components. Larger set with the closest spacing gave the highest bulb yield (25.6 t/ha). Smaller set with nitrogen at zero level produced the maximum number of single bulbs. The closest spacing with 120 N/ha gave the highest bulb yield (31.6 t/ha). Maximum bulb yield (33.7 t/ha) was recorded from the combination of larger set x closest spacing x 120 kg N/ha. Smaller set 'x closest spacing x zero level N produced the highest number of single bulbs.
  M.S. Islam , M.M. Islam and S.U. Ahmed
  The study was carried out in the Meghna river-estuaries of Bhola district from January, 1996 to December, 1997 with a view of quantify the extent of damage of shell and fin-fish larvae during collection of P. monodon larvae as target species. Study revealed that during collection of each Penaeus monodon (Fab.) post larva (PL), about 26 and 17 larvae of other shrimp, 16 and 7 fin-fishes and 90 and 39 macrozooplankters respectively were ruthlessly destroyed during the consequent years. During the study period, about 1.10 and 0.89 million man days/years, respectively were found to involve in shrimp fry collection. It was also recorded that about 11.0 and 8.2 million of P. monodon PLs respectively were harvested in 1996 and 1997 from the study area. The study indicates that indiscriminate killing of shell and fin-fishes and other valuable aquatic organisms during collection of P. monodon PL by shrimp seed collectors is causing threat to aquatic biodiversity conservation and ecology of coastal waters.
  M.S. Islam , M.S.A Khan and S.U. Ahmed
  An experiment was carried out at Brackishwater Station, Bangladesh Fisheries Research Institute, Paikgacha, Khulna from July to August, 1999 to assess the effect of feed on larval survival of Macrobrachium rosenbergii. Three treatments viz. Artemia nauplii plus egg custard (T1), Artemia nauplii only (T2) and rotifer-000 only (T3) were taken for the study each with three replicates. The experiment was conducted in celluloid tanks with M. rosenbergii larvae at a density of 50 nos./litre of water. Highest average survival rate (30.0%) was found in T1 and the lowest (4.5%) obtained in T3. Analysis of variance showed that the difference in larval survival under different treatments were significantly different (p<0.01). The results obtained implied that there is a immense potentiality for increasing freshwater prawn seed production through closed water system by using Artemia nauplii plus egg custard as feed.
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility