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Articles by M.E. Islam
Total Records ( 3 ) for M.E. Islam
  T. Ahamed , K.M. Hossain , M.M. Billah , K.M.D. Islam , M.M. Ahasan and M.E. Islam
  Newcastle disease virus (NDV) is the infectious agent of Newcastle disease in poultry. This virus can grow within different animal cells including primary cell culture and established cell line. In order to adapt NDV on African green monkey kidney (Vero) cell line, five consecutive passages were done. Eagle`s minimum essential medium (EMEM) with supplements was used for both culturing Vero cells and maintaining NDV on Vero cells. During first and second passage, wild NDV didn`t produce any clear evidence of cytopathic effect (CPE), but in third passage changes in the characteristics of cell monolayer were observed. During fourth and fifth passages, clear and consistent CPE were observed within 50 to 60 hours of infection. CPE was characterized by formation of syncytium, giant cell, dendritic-shaped cell and finally plaque. The titer of passage 5 (P5) virus was 10-3.9TCID50, whose purity was tested by serum neutralization test (SNT) and the result was 1.6 x 104 units/ml.
  N.A. Khatune , M.E. Islam , M.A.A. Rahman , M.A. Baki , G. Sadik and M.E. Haque
  The pure compound, 6-(-3-methylbut-2-enyl)-6´-7-dihydroxycoumestan (1) isolated from the chloroform extract of the seeds of Psoralea corylifolia Linn. was evaluated for the pesticidal activity against both adults and different instars of Tribolium casteneum Hebrst. under laboratory conditions. The LD50 values for the compound were 910.34, 620.47, 388.45 and 1159.87, 714.88, 404.26 and 1395.70, 740.75, 493.97 and 1605.34, 835.61, 565.83 and 1652.84, 916.79, 729.50 and 1764.32, 994.16, 784.09 and 1678.52, 992.04, 795.67 and 2350.41, 1395.70, 985.12 ppm for the 1st, 2nd, 3rd, 4th, 5th, 6th, adult male and female, respectively at 24, 48 and 72 h post exposure. These results demonstrated that the earlier instars were more sensitive to the compound than those of late instars those follow to those of individual adults.
  P. Shrestha , M.M. Ahasan , K.M.D. Islam , M.M. Billah , M.E. Islam , M. Mehedi , S. Mitra and M.R. Islam
  In the present experiment, Enzyme linked immunosorbent assay (ELISA) was applied on a total of 49 samples collected from 4 breeds of chicken (BV-300, Broiler Kasile, LBM and Hisex) at different age (day 1, day 5, day 10 and day 15) to determine the level of maternally derived antibody (MDA) against infectious bursal disease (IBD). All the chickens were the progeny from the parentstock that had the history of vaccination. A total number of 10 broilers were used to determine the level of IBDV specific antibody in vaccinated and in non-vaccinated chickens following infection with field virus suspension. As these chickens attained the age of 14 days, 6 chickens were vaccinated with Gumboro D78 live vaccine while remaining 4 chickens were kept without vaccination. All the chickens were infected with field virus suspension on day 19 and blood samples collected on day 29 were subjected to ELISA. Slight variation in the antibody titer was observed among 4 breeds of chickens. An average antibody titer of 5320.79, 5877.15, 3676.24 and 5581.55 was found in day old BV-300, Broiler Kasile, LBM and Hisex respectively. Day old BV-300 contained high level of MDA (average of 5320.79) and the level gradually declined and persisted up to 15-20 days. Five days old, 10 days old and 15 days old BV-300 contained an average antibody titer of 3848.57, 2615.53 and 580.88, respectively. On day 29, there was a significant level of antibody (1489.50), much above minimum protection level, in vaccinated chicken whereas nil antibody level was observed in non-vaccinated chickens. Therefore, the chicks should be vaccinated at around day 14, at which time the antibody level reaches nearly to minimum protection level. Antibody level must be carefully monitored at proper interval of time in order to make the vaccination program more effective, to keep the chickens disease free, to increase the production and to prevent the economic loss.
 
 
 
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