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Articles by M. A. Rahman
Total Records ( 6 ) for M. A. Rahman
  M. A. Rahman , S.M. N. Amin , F. Md. Yusoff , A. Arshad , P. Kuppan and M. Nor Shamsudin
  The present study is an attempt to describe the size frequency distribution, length weight relationships and fecundity estimates of long-spined Sea Urchin, Diadema setosum from the Pulau Pangkor, Peninsular Malaysia. In total 101 specimens of D. setosum were collected from the inter-tidal reef of Pulau Pangkor of Parek during the breeding season in May–August, 2010. Individual total length (TL) was measured using digital slide calipers and individual body weight (BW) was taken using a digital balance. Mean length of D. setosum was estimated as 59.66 mm and the mean weight was 101.68 g. Among the 101 specimens, 52 were males and 49 were females, indicating a sex ratio of male to female of 1:0.94. The logarithmic form of length-weight relationship of D. setosum was Log W = -1.3977 + 1.9049*Log TL, while the exponential form of equation obtained for the length-weight relation was W = 0.04*TL1.9049. The value of regression co-efficient (r2) estimated for the species was 0.63. The mean fecundity was estimated at 7,313,600 (±567,992) with a range between 6,290,000 and 7,980,000 eggs. Analysis of the relationship between the absolute fecundity (F) and total length (TL), and also between the fecundity and drained body weight (DW), revealed a linear regression model with a positive and significant relationship. This study presents results on the total length-body weight relationships and fecundity estimates of this Sea Urchin from Pulau Pangkor, Peninsular Malaysia for the first time.
  M. A. Rahman and M. G. Rabbani
  Investigation was carried out at the Horticulture Farm of Bangladesh Agricultural University, Mymensingh during 1992-93 and 1993-94 growing seasons to study the effects of storage conditions of seed tubers on the subsequent crop performance of some indigenous potato varieties. Seed tubers (20-30 mm dia) were stored either in cold storage (6-8°C and 85-90% relative humidity) or in diffuse light storage under thatched house conditions. Plant emergence, percent foliage coverage at 60 DAP and the number of tubers per hill were significantly higher in plants from cold-stored seed tubers. There were no significant effects of storage conditions of seed tubers on plant height and yield of tubers in 1992-93. Seed tubers stored in cold storage produced higher yield in 1993-94. Yield of the indigenous potato varieties differed widely. Also significant interactions were observed among varieties and storage conditions of seed tubers. The results of the two separate experiments in two subsequent years indicate that diffuse light storage of seed tubers in farm-house conditions may be practiced without substantial yield loss of indigenous potatoes in Bangladesh.
  M. A. Rahman , S. M. Nurul Amin , G. C. Haidar and M. A. Mazid
  Population parameters of Tenualosa ilisha were estimated using FISAT software with length-frequency data collected from different landing centre of Bangladesh. The von Bcrtalanffy growth parameters L∞ and K for the species were 61.50 cm and 0.83 yr–1 respectively. The annual rate of natural (M) and fishing mortality (F) were found to be 1.28 and 2.01 respectively. The estimated values of the exploitation rate (E) using the length converted catch curve and Virtual Population Analysis were 0.61 and 0.346 respectively. Emax was found to be 0.697. The recruitment pattern of this species was continuous with one peak per year. The present investigation clearly showed the over fishing (E>0.50) condition for T. ilisha in Bangladesh. The estimated length weight relationship for the combined sex was found to be W = 0.01351*TL2.974.
  M. A. Rahman , M. S. Saad , O. Azizah and G. B. Saleh
  Variation and transgressive segregations were studied in the backcross generations of populations involving three crosses in long bean [Vigna sesquipedalis (L.) Fruw]. Trends were different for different crosses. In Cross 1, high mean, variance and significant transgressive segregation (STS) pattern were exhibited by BC2F1 generation for shelf life, pod yield per plant and pod weight. In Cross 2, high means were shown by BC1F1 generations for shelf life and pod yield per plant, but high STS were observed in BC2F1 generation for shelf life, BC1F1 for pod yield per plant and BC1F2 for pod weight. In Cross 3, BC1F2 generation revealed high variances for shelf life, pod yield per plant and number of pods per plant, but highest STS values were revealed for BC1F3 (selected) for shelf life and pod yield per plant, BC2F1 for number of pods per plant, and BC1F2 for pod weight. In general, shelf life was found to have exhibited high mean and STS in the BC2F1 generation. Pod length, in general did not show good transgressive segregation in the crosses. Exploitation of these transgressive segregants in breeding programmes for improvement of the character of interest is suggested.
  M. A. Rahman , A.K.M.S. Islam , A. Khair and B.K. Bala
  Two tests were conducted using xenon (Xe), krypton (Kr) and nitrogen (N2) for storage of persimmon fruits. Under test-1, fruits were treated with Xe, Kr and N2 at a partial pressure of 0.3MPa for nine days at 10 oC. In test-2, only Xe gas was applied with 0.3MPa to the fruits for 17 days at 15 oC. In test-1, the estimated respiration rate was the lowest at 3.1 mgCO2 kg–1 h–1 in Xe treated sample, while it was 5.9, 6.7 and 6.9 mgCO2 kg–1 h–1 for Kr, N2 and control treatments respectively. No significant changes in colour and taste were observed at all. In test-2, Xe treatment showed a lower respiration rate (8.0 mgCO2 kg–1 h–1) as compared with the control (10.2 mgCO2 kg–1 h–1). The respiration rates were 47 and 22% lower in Xe treated persimmons than that of the control at 10oC and 15oC, respectively. In the control treatment, colour was started to deteriorate after nine days (test -2). Suppression of both the colour change and browning of flesh were observed in the treated sample. Metabolic activity was suppressed in samples treated with Xe. It was concluded that the Xe treated sample was in good condition. Therefore, the Xe treatment could be used for extending the storage life of persimmon fruit.
  M. A. Rahman , A.K.M.S. Islam , B.K. Bala and A. Khair
  Xenon treated eggplant fruit was studied to examine the formation of structured water through nuclear magnetic resonance (NMR) measurements. Spin-lattice relaxation time (T1) and spin-spin relaxation time (T2), were carried out immediately after sample preparation and one day of xenon application, and continued for 15 days at the same temperature. It was found that the mean relaxation times T1 (921 ms) and T2 (324 ms) were shorter in the xenon treated samples compared with the control ones, T1 (995 ms) and T2 (344 ms), respectively. Two phase behaviours were observed for both T1 and T2. T2 was also found to be independent to temperature. Browning of flesh was developed in the control sample after 6 days, while no sign of flesh browning was developed after 17 days in the treated sample. Formation of structured water by xenon gas results in suppression of the metabolic activity. Thus, xenon application was found to be effective in extending the storage life and maintaining the quality of fresh agricultural products.
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