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Articles by S. Rahman
Total Records ( 8 ) for S. Rahman
  Rownok Jahan , Md. Abdul Quaiyum , Bhakta Supratim Sarker , M. Belal Hossain , K.M. Khalid Bin Jaman and S. Rahman
  Small (length <25 cm) indigenous fish species (SIS) play an important role in providing animal sources of protein in the poor rural houses of Bangladesh. They are also valuable sources of vitamin A, calcium and Iron. But since the green revolution started in Bangladesh their diversity has been decreased alarmingly. This investigation was carried out from December 2010 to November 2011 in the riversand beels of Karimganj Upazila, Bangladesh to assess the biodiversity status of SIS. The samples were collected from Balikholafish landing centre and thearea was visited at least once in a month. However, during the study period, only 30 species belonging to 7 orders and 15 families were identified where 19 species had normal abundance, 6 species moderate abundance and 5 species least abundance. The highest number (9) of species was recordedfrom the family Cyprinidae and Puntius sophore being the most dominant. Among the families, contribution of Cyprinidae was 30%, followed by Bagridae and Schilbeidae 10%, Channidae and Clupeidae 6.67% and rest of the each family was 3.33%. The species comprised 39% catfishes, 22% minnows, 17% barbs, 10% perch, 5% snakeheads, 2% gourami, and river shads, loaches, gar, glass fish, goby were 1% individually. The highest number of species (25) was found in October and the lowest (3) in February. The maximum yield of SIS was found in (Sep-Dec) period and the least availability of SIS found during (Jan-Apr). Among the fish species, 2 were considered as critically endangered (CR), 4 were endangered, 3 were vulnerable (VU) and 2 were Data Deficient (DD). From this repot, general people, researcher and policy makers would be able to know about the valuable SIS fishes of the study area, their present biodiversity status and their seasonal abundance. The information will be helpful for proper conservation and management of the SIS.
  S.M. Raquibul Hasan , M.M. Hossain , R. Akter , M. Jamila , M.E.H. Mazumder , M.A. Alam , A. Faruque , S. Rana and S. Rahman
  Analgesic potential of the pet ether (PECB), chloroform (CCB), n-butanol (NBCB) and hydromethanolic (HMCB) fractions of the aerial parts of Commelina benghalensis Linn. was evaluated for centrally acting analgesic property using hotplate and tail immersion method and peripheral pharmacological actions using acetic acid-induced writhing test to scientifically validate some of the folkloric and ethnomedical uses of the plant. All fractions, at the dose of 200 and 400 mg kg-1 b.wt., displayed significant analgesic action in a dose dependent manner in the tested models. In acetic acid-induced writhing test, all extracts exhibited significant (p<0.05) reduction of writhing response in a dose dependent manner; the response decreased in the order Diclofenac-Na (76.16%) > CCB2 (68.8%) > NBCB2 (61.9%) > HMCB2 (52.8%) > PECB2 (48.0%). In hotplate and tail immersion method, all fractions caused a significant (p<0.0-0.001) increase in latency time and the results are comparable to the standard drug Nalbuphine. These results suggest significant analgesic potential of C. benghalensis and thereby justify its traditional uses in various types of pain.
  D. R. Lapen , E. Topp , M. Edwards , L. Sabourin , W. Curnoe , N. Gottschalla , P. Bolton , S. Rahman , B. Ball-Coelho , M. Payne , S. Kleywegt and N. McLaughlin
  This study examined bacteria and nutrient quality in tile drainage and shallow ground water resulting from a fall land application of liquid municipal biosolids (LMB), at field application rates of 93,500 L ha–1, to silt-clay loam agricultural field plots using two different land application approaches. The land application methods were a one-pass AerWay SSD approach (A), and surface spreading plus subsequent incorporation (SS). For both treatments, it took between 3 and 39 min for LMB to reach tile drains after land application. The A treatment significantly (p < 0.1) reduced application-induced LMB contamination of tile drains relative to the SS treatment, as shown by mass loads of total Kjeldahl N (TKN), NH4–N, Total P (TP), PO4–P, E. coli., and Clostridium perfringens. E. coli contamination resulting from application occurred to at least 2.0-m depth in ground water, but was more notable in ground water immediately beneath tile depth (1.2 m). Treatment ground water concentrations of selected nutrients and bacteria for the study period (∼46 d) at 1.2-m depth were significantly higher in the treatment plots, relative to control plots. The TKN and TP ground water concentrations at 1.2-m depth were significantly (p < 0.1) higher for the SS treatment, relative to the A treatment, but there were no significant (p > 0.1) treatment differences for the bacteria. For the macroporous field conditions observed, pre-tillage by equipment such as the AerWay SSD, will reduce LMB-induced tile and shallow ground water contamination compared to surface spreading over non-tilled soil, followed by incorporation.
  S. Rahman , Bashir Ahmad , Mohammad Shafi and Jehan Bakht
  Statistical analysis of the data revealed that yield and yield components of Wheat cultivars were significantly (p<0.05) affected by different salinity levels. Agronomic characters i.e. plant height, tillers plant–1, number of grains plant–1, 100 grains weight, grain and straw yield and harvest index of two salt tolerant cultivars (Mutant and Lu 26S) were reduced less than salt sensitive cultivars (Yecora and WS 711). Mutant and Lu 268 proved more salt tolerant than other cultivars at all growth stages. It could be concluded from these findings that grain yield was more adversely affected by salinity than straw production.
  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.
  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. Rahman , M. M. Rahman , S. U. Ahmed and M. R. Kawser
  A study was undertaken to evaluate the possibility of utilizing natural brackishwater (from Shibsa River) in the hatching operation and larvae culture of Macrobrachium rossenbergii. Three treatments each with three replications were tested. Natural brackish water diluting by rainwater (T1), natural brackishwater diluting by under ground tap water (T2) and natural brackish water with salinity range from 12 to 20 ppt. (T3) were considered. In case of dilution (in T1 and T2) salinity concentration range was maintain from 4-18 ppt as per requirement of the experiment and stage of brood and larvae. Significant higher survival (23.38%) for T1 was observed followed by T3 with 13.63% and T2 with 4.38% up to post larvae (PL) stage. Significant (p<0.05) difference in survival rate of larvae between T1 and T2 and T2 and T3 was observed. Study reveals that natural brackishwater diluting by rain water can be effectively used in the hatching operation and larvae culture of the freshwater giant prawn, M. rossnbergii.
  S. Rahman and M. E. H. Mazumder
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