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Late Professor Dr. Quazi Abdul Fattah 已故的Quazi Abdul Fattah教授
Pub Date : 2021-03-04 DOI: 10.3329/JBAS.V44I2.52282
Z. Begum
Abstract not available Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, i-iii, 2020
《孟加拉国科学院学报》,第44卷,第2期,2020年第1 - 3期
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引用次数: 0
Reminiscences of Past Days with Prof. Dr. Mohammad Ali Asgar, Fellow, BAS 与穆罕默德·阿里·阿斯加尔教授,英国科学系研究员追忆往事
Pub Date : 2021-03-04 DOI: 10.3329/JBAS.V44I2.52283
M. S. Ali
Abstract not available. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, iv-vii, 2020
摘要不可用。《孟加拉国科学院学报》,第44卷,第2期,2020年第4 - 7期
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引用次数: 0
Approximate solution of nonlinear differential system with time variation 时变非线性微分系统的近似解
Pub Date : 2021-01-19 DOI: 10.3329/JBAS.V44I2.51456
Rezaul Karim, Pinakee Dey, Saikh Shahjahan Miah
this paper develops a reliable algorithm based on the general Struble’s technique and extended KBM method for solving nonlinear differential systems. Moreover, we find a solution based on the KBM and general Struble’s technique of nonlinear autonomous systems with time variation, which is more powerful than the existing perturbation method. Finally, results are discussed, primarily to enrich the physical prospects, and shown graphically by utilizing MATHEMATICA and MATLAB software. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, 121-130, 2020
本文基于一般鲁布尔技术和扩展KBM方法,提出了求解非线性微分系统的可靠算法。此外,我们还找到了一种基于KBM和具有时变的非线性自治系统的一般Struble技术的解,它比现有的摄动方法更有效。最后对结果进行了讨论,主要是为了丰富物理前景,并利用MATHEMATICA和MATLAB软件进行了图形化展示。《孟加拉国科学院学报》,第44卷,第2期,121-130,2020
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引用次数: 0
Anti-fungal secondary metabolites and hydrolytic enzymes from rhizospheric bacteria in crop protection: a review 根际细菌抗真菌次生代谢物和水解酶在作物保护中的研究进展
Pub Date : 2021-01-19 DOI: 10.3329/JBAS.V44I2.51452
Farhana Tasnim Chowdhury, Nazia R. Zaman, M. R. Islam, Haseena Khan
Plant growth promoting rhizobacteria (PGPR) residing in soil rhizosphere provide enormous beneficial effects to a plant host producing diverse secondary metabolites and enzymes useful for plant growth and protection. Siderophores, antibiotics, volatile compounds and hydrolytic enzymes are the major molecules secreted by the PGPRs, which have substantial antifungal properties and can provide plant protection. These compounds are responsible for the lysis and hyperparasitism of antagonists against deleterious fungal pathogens. Siderophore-producing PGPRs function by depriving the pathogen of iron nutrition. Antibiotics have been reported to be involved in the suppression of different fungal pathogens by inducing fungistasis, inhibition of spore germination, lysis of fungal mycelia. The PGPRs also secrete a wide range of low molecular weight volatile organic compounds (VOCs) that inhibit mycelial growth, sporulation, germination of phytophathogenic fungi, etc. Hydrolytic enzymes, mostly chitinase, protease and cellulose, lyse the cell wall of fungi. Therefore, plant growth-promoting rhizobacteria can be considered as an effective, eco-friendly, and sustainable replacement to the chemical fungicides. There are many PGPRs that perform very well in controlled conditions but not in field conditions, and hence the commercializing of hese products is not easy.  Development of formulations with increased shelf life, a broad spectrum of action and consistent performance under field conditions can pave the way for commercializing the PGPRs at a faster rate. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, 69-84, 2020
土壤根际促进植物生长的根际细菌(PGPR)为植物寄主提供了巨大的有益作用,产生了多种对植物生长和保护有用的次生代谢产物和酶。铁载体、抗生素、挥发性化合物和水解酶是PGPRs分泌的主要分子,具有很强的抗真菌活性,对植物具有一定的保护作用。这些化合物负责对有害真菌病原体的拮抗剂的裂解和过度寄生。产生铁载体的PGPRs通过剥夺病原体的铁营养发挥作用。据报道,抗生素通过诱导抑菌,抑制孢子萌发,裂解真菌菌丝来抑制不同的真菌病原体。PGPRs还分泌广泛的低分子量挥发性有机化合物(VOCs),抑制菌丝生长、产孢、植物致病真菌萌发等。水解酶,主要是几丁质酶、蛋白酶和纤维素酶,可以分解真菌的细胞壁。因此,促进植物生长的根瘤菌可以被认为是化学杀菌剂的有效、环保和可持续的替代品。有许多pgpr在受控条件下表现非常好,但在现场条件下表现不佳,因此这些产品的商业化并不容易。开发具有更长的保质期、更广泛的作用范围和在现场条件下一致的性能的配方可以为pgpr更快的商业化铺平道路。《孟加拉国科学院学报》,第44卷第2期,2020年第69-84期
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引用次数: 5
Proximate analysis and nutrient content estimation of marine fish species of saint martin’s island in Bangladesh 孟加拉圣马丁岛海鱼种类近似值分析及营养成分估计
Pub Date : 2021-01-19 DOI: 10.3329/JBAS.V44I2.51462
Tanhaul Islam, M. Shoeb, Md. Nazrul Islam, Rafiza Islam, M. Rhaman, Nilufar Nahar
Saint Martin’s Island is a unique coral island in Bangladesh. Locally available fish species (both fresh and dry fish) were collected from the island to study moisture, ash, fat, protein content, fatty acid compositions and heavy metals. Fish oil was extracted from samples by solid phase dispersion method and fatty acid compositions were analyzed by GC-FID. Protein content in fresh fish samples was determined by the micro-Kjeldahl method.  Homogenized samples were digested, filtered and analyzed by AAS for determining toxic heavy metals in the fish samples. The fresh fishes appear to be a good source of dietary protein. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, 191-195, 2020
圣马丁岛是孟加拉国一个独特的珊瑚岛。从岛上收集当地可用的鱼类(新鲜和干鱼),研究水分、灰分、脂肪、蛋白质含量、脂肪酸组成和重金属。采用固相分散法提取鱼油,GC-FID分析脂肪酸组成。采用微凯氏定氮法测定鲜鱼样品中的蛋白质含量。匀浆后的样品经消化、过滤和原子吸收光谱分析,用于测定鱼样品中的有毒重金属。新鲜的鱼似乎是膳食蛋白质的良好来源。孟加拉国科学院学报,第44卷,第2期,191-195,2020
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引用次数: 1
Numerical computation of natural ventilation system at the top floor of a multistory building in Dhaka city 达卡市某多层建筑顶层自然通风系统的数值计算
Pub Date : 2021-01-19 DOI: 10.3329/JBAS.V44I2.51460
Zavid Iqbal Bangalee, M. Ferdows, Roushanara Begum
urban environment studies have become more and more critical in the past decades because of the rapid development of urbanization in industrial countries. Temperature, velocity, average mass flow, etc. at different unit on the top floor of a multistory building are discussed here. For the numerical computation of the air flow inside the building rooms, the k−ε turbulence model is used. ANSYS CFX software is used to solve the governing equations. For modeling the building, Bangladesh's national building code is applied. The turbulence model is also validated by comparing the result with an experimental result and a numerical result. Satisfactory ventilation rate is also ensured by comparing the result with ANSI/ASHRAE Standard 62.1-2004. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, 161-178, 2020
近几十年来,由于工业化国家城市化的快速发展,城市环境研究变得越来越重要。本文讨论了多层建筑顶楼不同单元的温度、速度、平均质量流量等。对于建筑室内气流的数值计算,采用k−ε湍流模型。采用ANSYS CFX软件对控制方程进行求解。为了对建筑进行建模,采用了孟加拉国的国家建筑规范。通过与实验结果和数值结果的比较,验证了湍流模型的正确性。通过与ANSI/ASHRAE标准62.1-2004的比较,保证了满意的通风量。孟加拉国科学院学报,第44卷,第2期,161-178,2020
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引用次数: 0
Relative renal functions for children using 99mTC-DTPA and 99mTC-DMSA 99mTC-DTPA和99mTC-DMSA对儿童相对肾功能的影响
Pub Date : 2021-01-19 DOI: 10.3329/JBAS.V44I2.51455
F. Akter, Nure Alam Abdullah, M. A. Momin, M. Reza
Radionuclides are widely used to study the relative renal functions (RRFs) for kidney patients. This work reports the determination of the RRFs using the technetium-99m dimercaptosuccinic acid (99mTc-DMSA) and technetium-99m diethylenetriamine-pentaacetic acid (99mTc-DTPA) for children having kidney diseases. The two methods are then compared to find the choice of scintigraphy for a particular type of disease. A total of 65 child kidney patients of ages 5 months - 16 years were the representative samples of the study. The mean RRFs calculated with 99mTc-DTPA was found as  and respectively, for the left and right kidneys. On the other hand, the values are  and  respectively, using 99mTc-DMSA. a significant positive correlation () were found between the RRFs calculated with the two scanning methods in Pearson correlation analysis. In one way ANOVA test, we did not find any difference between the RRFs calculated with 99mTc-DTPA and 99mTc-DMSA between the left and right kidneys. In Bland-Altman Plots, no mean difference was found between the two scanning methods and the correlation limit lies between -13.5 and12.6. The present study suggests using a single method for a particular type of disease. 99mTc-DMSA is the primary choice for the evaluation of RRF since it is easy, inexpensive and also provides cortical morphology, renal scar and cyst evaluation. But for glomerular filtration rate and renogram curve, 99mTc-DTPA should be the obvious selection as 99mTc-DMSA fails to provide any information for these cases. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, 109-119, 2020
放射性核素被广泛用于研究肾脏患者的相对肾功能(RRFs)。本工作报道了使用锝-99m二巯基琥珀酸(99mTc-DMSA)和锝-99m二乙烯三胺-五乙酸(99mTc-DTPA)测定肾脏疾病儿童的RRFs。然后对这两种方法进行比较,以找到针对特定类型疾病的闪烁成像选择。65例5个月~ 16岁的儿童肾病患者为本研究的代表性样本。用99mTc-DTPA计算的平均RRFs分别为左肾和右肾。另一方面,使用99mTc-DMSA时,值分别为和。在Pearson相关分析中,两种扫描方法计算的RRFs之间存在显著的正相关()。在单因素方差分析检验中,我们没有发现左肾和右肾用99mTc-DTPA和99mTc-DMSA计算的RRFs有任何差异。在Bland-Altman图中,两种扫描方法之间没有平均差异,相关极限在-13.5 ~ 12.6之间。目前的研究建议对特定类型的疾病使用单一方法。99mTc-DMSA是评估RRF的首选方法,因为它简单、便宜,还能提供皮质形态学、肾瘢痕和囊肿的评估。但对于肾小球滤过率和肾图曲线,99mTc-DTPA应该是明显的选择,因为99mTc-DMSA不能提供任何信息。《孟加拉国科学院学报》,第44卷,第2期,109-119,2020
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引用次数: 0
New variants of the bottleneck tower of Hanoi problems 新变种瓶颈塔的河内问题
Pub Date : 2021-01-19 DOI: 10.3329/JBAS.V44I2.51463
A. Majumdar
This paper considers two variants of the bottleneck Tower of Hanoi problems with n (≥1) discs and the bottleneck size b (≥2), which allows violation of the “divine rule” (at most) once. Denoting by MB3(n, b) the minimum number of moves required to solve the new variant of the bottleneck Tower of Hanoi problem, an explicit form of MB3(n, b) is found. Also, MB4(n, b) denotes the minimum number of moves required to solve the new variant of the bottleneck Reve’s puzzle, a closed-form expression of MB4(n, b) is derived. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, 197-200, 2020
本文考虑了具有n(≥1)个圆盘和瓶颈大小为b(≥2)的瓶颈Tower of Hanoi问题的两种变型,这两种变型允许(最多)违反一次“神圣规则”。用MB3(n, b)表示解决河内瓶颈塔问题新变体所需的最小步数,得到MB3(n, b)的显式形式。同时,MB4(n, b)表示解决瓶颈Reve谜题新变体所需的最小步数,推导出MB4(n, b)的封闭表达式。《孟加拉国科学院学报》,第44卷,第2期,197- 200,2020
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引用次数: 0
Genetic variability and character association of Bangladeshi popular varieties of mustard (Brassica rapa L.) 孟加拉国流行品种芥菜的遗传变异及性状关联
Pub Date : 2021-01-19 DOI: 10.3329/JBAS.V44I2.51454
F. Sultana, J. Rahman, M. Hasan
A study was conducted to estimate genetic variability, correlation and direct and indirect effects of yield attributes on seed yield of fourteen Bangladeshi varieties of Brassica rapa. High heritability coupled with high genetic advance was recorded in a number of secondary branches plant-1, a number of siliqua plant-1 and a number of seeds siliqua-1 indicating the effects of additive genes in controlling the traits. Significant and positive association with seed yield plant-1 were observed in the number of primary branches plant-1, a number of seeds siliqua-1, while a negative association was found in days to maturity. The path analysis revealed that the days to first flowering, number of secondary branches plant-1 and 1000 seed weight were the main contributors to seed yield. The results suggest that days to first flowering, number of primary and secondary branches plant-1 and 1000 seed weight may be considered for selection to improve the seed yield in B. rapa. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, 95-107, 2020
对孟加拉国14个油菜品种进行了遗传变异、相关性及产量性状对种子产量的直接和间接影响研究。许多次枝植物-1、许多硅藻植物-1和许多种子植物-1均有较高的遗传力和遗传先进性,说明加性基因在性状控制中的作用。一次枝数plant-1和种子数sililqua -1与种子产量呈显著正相关,而成熟期呈负相关。通径分析表明,初花期、次枝数和千粒重是影响种子产量的主要因素。结果表明,为了提高拉柏种子产量,可考虑选择开花期、一次枝数和次枝数plant-1和1000粒重。《孟加拉国科学院学报》,第44卷第2期,2020年第95-107期
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引用次数: 1
Fuzzy pairwise regular bitopological spaces in quasi-coincidence sense 准重合意义上的模糊对偶正则双拓扑空间
Pub Date : 2021-01-19 DOI: 10.3329/JBAS.V44I2.51458
R. Amin, S. Hossain, Saikh Shahjahan Miah
This paper introduces three notions of fuzzy pairwise regular between bitopological spaces in quasi-coincidence sense. Then, we investigate some relations between ours and other counterparts. We observe that all these concepts are preserved under one-one, onto, fuzzy closed, fuzzy open, and fuzzy continuous mappings. Also, the hereditary property is satisfied by these concepts. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, 139-143, 2020
本文引入了准重合意义下双拓扑空间间模糊对正则的三个概念。然后,我们调查了我们与其他同行的一些关系。我们观察到所有这些概念在一一映射、上映射、模糊闭映射、模糊开映射和模糊连续映射下都是保持的。同时,这些概念也满足了世袭性。《孟加拉国科学院学报》,第44卷,第2期,139-143,2020
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引用次数: 2
期刊
Journal of Bangladesh Academy of Sciences
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