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Md. Anamul Hoque,Md. Mofaqkharur Rahman,Shamim Mahbub,Mezbah Hossain,Mohammed Abdullah Khan,Md. Ruhul Amin,Ali S. Alqahtani,Mohammad Z. Ahmed,Mohammed S. Alqahtani,Omar M. Almarfadi 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.7
Surfactant is one of the most important chemical entities in drug formulation which can bind with drug molecules. Herein, the binding interaction of ciprofloxacin hydrochloride (CFH) drug with two different surfactants (sodium dodecyl sulfate (SDS) and Triton X-100 (TX-100)) has been investigated through UV-Visible spectroscopic and cloud point measurement techniques at different conditions. The absorption spectrum of CFH was found to be dependent on presence of additives/temperature change. The binding constant (Kb) of CFH+SDS/CFH+TX-100 was found to be increased primarily, reached a maximum value and then decreased with the increase of temperature, except in water medium (pH=2.0) and 30% (v/v) methanol. The Kb values for CFH+SDS were found to be higher in the aqueous medium than almost all medium studied herein, while better binding was observed in the alcoholic medium in the case of the CFH+TX-100 system. The Gibbs free energy of binding (Gb o) for both CFH+SDS and CFH+TX- 100 systems were attained negative in each case studied, inferring the spontaneous binding phenomenon. The cloud point (CP) value of CFH+TX-100 mixture was lessened in ZnSO4·7H2O solution and the CP values exhibited a gradual reduction through the upsurge of electrolyte concentration. The positive values of the Gibbs free energy of clouding indicated the nonspontaneous clouding phenomena. To disclose the interaction between drug and surfactant, other thermodynamic parameters, e.g., enthalpy (Hb o) and entropy (Sb o), different transfer energies as well as entropyenthalpy compensation parameters of binding/clouding were evaluated and clarified with proper explanation.
Amin, Md. Ruhul,Hossain, Md. Shamim,Suh, Sang Jae,Kwon, Yong Jung Institute of Agricultural Science and Technology 2014 慶北大農學誌 Vol.32 No.4
Agriculture in Bangladesh is slowly transforming to the production of high-value fruit and vegetable crops to satisfy the nutrient requirements of their large size population, and this transformation is creating new challenges as regards improving and maintaining the productivity and crop quality. The country has a declining trend of insect pollinators due to habitat loss, land use changes, monoculture-dominated agriculture, and the excessive and indiscriminate use of pesticides. Such pollinator deficiencies can cause reduced yields, thereby threatening the subsistence of marginal farmers. In Bangladesh, growers enjoy free pollination services from the naturally occurring insect populations. While honeybees pollinate mustard, onions, and melons, many other hymenopterans, coleopterans, hemipterans, dipterans, and thysanopterans also visit the crop fields, making these insects significant for the food security, environment, and economy of the nation. Therefore, attention should be given to public policy, research, and human resource development that promotes knowledge and appreciation of the conservation and utilization of insect pollinators.
Md Ruhul Amin,Miltan Chandra ROY,Md Mahbubar RAHMAN,Md Giashuddin MIAH,권용정,서상재 한국곤충학회 2015 Entomological Research Vol.45 No.6
This study investigated the morphological and biochemical characteristics of the CB1, CB3, CB5, CB8 and CB12 cotton varieties and evaluated their effects on third instar larval movement, and body weight of the cotton armyworm Spodoptera litura at different developmental stages. The cotton varieties differed in their plant architecture, branching, stem color and hairiness, leaf color and hairiness, leaf trichome density, flower color, numbers of leaves and bolls per plant, concentrations of protein and starch, and boll length, width and weight. The CB1 and CB3 varieties possessed significantly higher trichome densities, while CB8 produced larger and heavier bolls. Boll bearing was found to be highest in CB1 and lowest in CB8. Biochemical analyses indicated the highest percentage of protein in CB5, and of starch in CB8; concentrations of both were lowest in CB12. Cotton varieties did not affect larval foraging, but their abundance on leaflet, mature and square differed significantly. Analysis of the growth response parameters of S. litura as a result of feeding on the tested varieties revealed that larval instars, pupae and adult moths attained the highest body weight on CB8, followed by CB5, and the lowest weight on CB12. Collectively, the results of this study show that the CB5 and CB8 varieties are favorable host‐plants for cotton armyworms; therefore, these varieties are the least suitable for cultivation.
Performance Study of Manual Reaper Compared to Manual Harvesting for Rice and Wheat
( Md. Maksudur Rahman ),( Md. Abu Ayub Siddique ),( Md. Ruhul Amin ),( Md. Kamal Uddin Sarker ),( Yong-joo Kim ),( Seo Bo Gun ) 한국농업기계학회 2017 한국농업기계학회 학술발표논문집 Vol.22 No.2
Considering scarcity and high wage of labor, higher shattering loss, mechanized harvesting is crying need to be introduced as alternative of manual harvesting for rice and wheat in Bangladesh. This paper was carried out to compare the performance of manual reaper against manual harvesting method for rice and wheat. The selected field operations were done in several times to calculate the average performance. The operation time was recorded by stop watch. The actual field capacity and break-even point were calculated by using empirical equation. The average field capacity of manual reaper was 0.3482 ha/day for rice and 0.3236 ha/day for wheat with fuel consumption of 0.755 L petrol/h and 0.625 L petrol/h respectively. In manual harvesting, the average field capacity was 0.0312 ha/man-day and 0.0452 ha/man-day for rice and wheat respectively. It was revealed that using manual reaper, harvesting cost could be saved 58% for rice and 53% for wheat, consequently harvesting of selected crops by reaper was efficient than manual harvesting. It was also observed that if manual reaper works below break-even point 0.32 ha and 0.52 ha for rice and wheat respectively, it would not be economically feasible to farmers. Finally, manual reaper could be suggested as better mechanization for harvesting of rice and wheat, cultivated on fragmented lands.
Md. Ruhul Amin,Tules Sarkar,전익조 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.5
A field experiment was conducted with a view to understand the fruit infestation rate by fruit fly, Bactrocera cucurbitae on ash gourd, ridge gourd, sweet gourd, bitter gourd and snake gourd, and life history of the fly on these cucurbitaceous crops were studied in laboratory condition. The highest (71.5%) and lowest (21.0%) fruit infestation rate were observed on sweet gourd and ridge gourd, respectively and the results were statistically different. Life history parameters indicated that the pre-mating durations of the flies were found 2.5 to 4.5 days. The highest fecundity and hatching rate were observed on sweet gourd (56.2 female^(-1) and 53.5%) and that were lowest on ridge gourd (36.7 female^(-1) and 34.8%). Incubation periods varied from 18.3 to 25.0 hours and the shortest period was found on sweet gourd. Pre-oviposition, oviposition, larval and pupal periods, and adult male and female longevity varied from 10.8 to 15.7, 5.5 to 9.5, 11.3 to 15.3, 7.3 to 10.5, 11.3 to 17.3 and 15.0 to 20.8 days, respectively. The highest infestation rate while shortest premating, pre-oviposition, incubation,larval and pupal periods on sweet gourd indicated that this plant is the most favorable host for B. cucurbitae among the studied crops.
Characteristics of three cotton varieties and their impact on feeding and growth of cotton armyworm
Md Ruhul Amin,Dil Afrose TITHI,권용정 한국곤충학회 2011 Entomological Research Vol.41 No.4
This study investigated morphological and biochemical characteristics of CB9, CB10 and SR05 cotton varieties and observed their effect on feeding and growth of cotton armyworm Spodoptera litura. Morphological characters of plant architecture, branching, color, hairiness, trichome density and boll size indicated that CB9 is a bushy, well developed, branched, light bronze colored and hairy variety with number of trichomes 193/㎠ and boll weight 5.5–6.0 g/boll. Both CB9 and CB10 bear normal leaves and spherical bolls whereas SR05 has well-ventilated branching, okra shaped and ventrally arranged light bronze colored leaves and oval bolls ranging 4.0–4.5 g/boll. Biochemical analysis indicated significant differences in starch and protein contents, which range 11.4–21.3 and 17.5–30.6%, respectively. The lowest percentages of starch and protein were found in SR05 and CB9, respectively. Cotton varieties showed significant effects on second, third, fourth and fifth instar larval weight and they attained the highest weights (22.7, 133.8, 168.2 and 1190.2 mg, respectively) when fed SR05. Larvae and moths fed SR05 also showed the significantly highest cocoon, exuviae, and adult male and female weights (434.5, 19.2, 161.3 and 232.4 mg, respectively). The cotton armyworm showed the significantly highest growth index (1.5) as well as lowest feeding index (0.05) on SR05. Results of this study indicated that SR05 is suitable for larval feeding and development, and suggest that this variety is least suitable for cotton growers in areas where S. litura is a major pest.
Md. Ruhul Amin,Kyi Kyi Than,권용정 한국응용곤충학회 2009 Journal of Asia-Pacific Entomology Vol.12 No.3
The influence of copulation duration on mating frequency and colony development were studied in Bombus terrestris (Hymenoptera: Apidae). Copulation time was recorded in transparent plastic boxes and was manipulated by separating mating pairs. Mean copulation duration was found to be 30.0±8.0 (mean±se) minutes and most matings lasted 20 to 40 min. When queens were only allowed to mate for 2 to 5 min, the chance that they would accept a second mating was 7.2±5.0 % (mean±se). Incompletely mated queens delayed to initiate colonies but they did not show significant difference from fully mated queens in production of new queens and males. This study shows that colony development was not affected by shortcopulation duration.
Md. Ruhul Amin,Yong Jung Kwon,Zin Mar Thet 한국응용곤충학회 2011 Journal of Asia-Pacific Entomology Vol.14 No.4
Bumblebee, Bombus terrestris queens undergo winter diapause and show a great difference in diapause duration in natural conditions. Queens emerged from diapause initiate colonies by producing a batch of diploid (fertilised) eggs that develop into workers. In this study we investigated the effects of both the duration of queen diapause (2, 3, 4, or 5 months) and colony size (artificially limited to 50, 100, 150, and 200workers) on the number of sexuals (males or new queens — gynes) produced, when gynes are produced and the longevity of both the foundress queen and the colony. Both worker population and diapause duration showed significant effect on sexual gyne production, foundress queen longevity and colony longevity but their interaction effect was insignificant. The worker number and diapause duration, respectively showed significant effect on sexual male production and gyne emergence period, but their interaction effects were insignificant.