Journal of Bangladesh Academy of Sciences最新文献_第8页

Automatic detection of fetal health status from cardiotocography data using machine learning algorithms 使用机器学习算法从心脏造影数据中自动检测胎儿健康状况

Journal of Bangladesh Academy of Sciences Pub Date : 2022-01-26 DOI: 10.3329/jbas.v45i2.57206

Md Tamjid Rayhana, Asm Shamsul Arefina, Sabbir Ahmed Chowdhury

引用次数: 1

Comparative study of morphology and heterochromatin distribution in three oilseed species of Brassica L. 芸苔属三种油籽植物形态及异染色质分布的比较研究。

Journal of Bangladesh Academy of Sciences Pub Date : 2022-01-26 DOI: 10.3329/jbas.v45i2.57207

Faria Akbar, K. Begum

{"title":"Comparative study of morphology and heterochromatin distribution in three oilseed species of Brassica L.","authors":"Faria Akbar, K. Begum","doi":"10.3329/jbas.v45i2.57207","DOIUrl":"https://doi.org/10.3329/jbas.v45i2.57207","url":null,"abstract":"Morphological traits and nature of heterochromatins in interphase nuclei and prophase chromosomes of three oilseed species of Brassica L. (B. campestris, B. juncea, and B. napus) have been investigated in this study for morpho-cytotaxonomical evaluation. The three Brassica species displayed morphologically differences in the case of plant heights, size and the shape of upper and basal leaves, types of inflorescence and color of seeds, etc. After analyzing the staining properties of heterochromatins (nature and amount) in the interphase nuclei, it was unveiled that B. juncea had a simple chromocenter type of interphase nuclei and might be perceived as the most evolved one among the three species of Brassica. Moreover, the phylogenetic relationship derived from the mean values of morphological traits also manifested the distinct position of B. juncea than the other two studied species of Brassica. Therefore, the findings obtained in this study may be utilized as a feasible implementation of biosystematics for the identification and proper characterization of the three species of Brassica L.\u0000J. Bangladesh Acad. Sci. 45(2); 169-179: December 2021","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86310309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mathematically forecasting for generalized business by using fuzzy trapezoidal numbers 利用模糊梯形数对广义业务进行数学预测

Journal of Bangladesh Academy of Sciences Pub Date : 2022-01-26 DOI: 10.3329/jbas.v45i2.52330

F. Khatun, Md. Sahadat Hossain

引用次数: 1

An analytical technique for handling forced Van der Pol vibration equation 处理强迫范德波尔振动方程的一种解析技术

Journal of Bangladesh Academy of Sciences Pub Date : 2022-01-26 DOI: 10.3329/jbas.v45i2.56654

M. W. Ullah, M. Uddin, M. S. Rahman

引用次数: 1

Optimizing the wash time of the washing machine using several types of fuzzy numbers 利用几种类型的模糊数优化洗衣机的洗涤时间

Journal of Bangladesh Academy of Sciences Pub Date : 2021-07-15 DOI: 10.3329/JBAS.V45I1.54432

A. Islam, S. Hossain

引用次数: 3

Orcein and DAPI-stained karyotype analysis of Alocasia macrorrhizos (L.) G. Don 巨根海苔(Alocasia macrorhizos)核型分析g .不

Journal of Bangladesh Academy of Sciences Pub Date : 2021-07-15 DOI: 10.3329/JBAS.V45I1.54257

Ashma Ahmed Warasy

引用次数: 0

The effect of flight state parameters on the performance of photovoltaic modules in solar aircraft 飞行状态参数对太阳能飞机光伏组件性能的影响

Journal of Bangladesh Academy of Sciences Pub Date : 2021-07-15 DOI: 10.3329/JBAS.V45I1.54261

Saydul Morshed Tanvir, Xiao Wenbo, Jin Xin

{"title":"The effect of flight state parameters on the performance of photovoltaic modules in solar aircraft","authors":"Saydul Morshed Tanvir, Xiao Wenbo, Jin Xin","doi":"10.3329/JBAS.V45I1.54261","DOIUrl":"https://doi.org/10.3329/JBAS.V45I1.54261","url":null,"abstract":"Based on the power generation model of photovoltaic modules, the effects of flight speed, altitude, time and area in solar aircraft on the performance of photovoltaic modules have been studied. As the flight speed increases, the power generated by the module increases but tends to saturate. When the conversion efficiency of photovoltaic modules is improved, the required power of the solar aircraft and the power generated by the photovoltaic modules are balanced at a faster flight speed. The power generated by the modules increases with the flight altitude but tends to saturate due to the drop of air temperature and the surface temperature of the module. The higher the altitude, the smaller is the atmospheric density, and atmospheric permeability, and the greater is the solar radiation intensity, and thus the power generated by the module increases. The power generated by the components is the strongest at noon. Battery performance is the strongest in summer and the weakest in winter, as the module’s performance is mainly determined by the intensity of solar radiation. Finally, the energy distribution of solar aircraft and long-time space flight has been discussed. J. Bangladesh Acad. Sci. 45(1); 73-83: June 2021","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81634375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phytochemical profiling, antioxidant potentiality and antibacterial activity of the ethanolic extracts of Rosenvingea sp. of Bay of Bengal 孟加拉湾蔷薇草乙醇提取物的植物化学特征、抗氧化潜力和抗菌活性

Journal of Bangladesh Academy of Sciences Pub Date : 2021-07-15 DOI: 10.3329/JBAS.V45I1.54260

A. Alim, Farzanoor Rahman, T. Ahsan, T. Islam, M. Alam, M. Hossain

{"title":"Phytochemical profiling, antioxidant potentiality and antibacterial activity of the ethanolic extracts of Rosenvingea sp. of Bay of Bengal","authors":"A. Alim, Farzanoor Rahman, T. Ahsan, T. Islam, M. Alam, M. Hossain","doi":"10.3329/JBAS.V45I1.54260","DOIUrl":"https://doi.org/10.3329/JBAS.V45I1.54260","url":null,"abstract":"The objective of the present study was to explore the phytochemical profiling, antioxidant and antimicrobial activity of 50% ethanolic extract of Rosenvingea sp. found in the Bay of Bengal of Bangladesh. Seven phytochemicals were tested from the ethanolic extract of Rosenvingea, where four phytochemicals, namely steroid, glycosides, alkaloids, and tannins were present. However, ethanol extract exhibited low antioxidant activity compared to standard ascorbic acid as measured by DPPH-Free radical scavenging assay. In Brine Shrimp lethality bioassay, 50% ethanolic extract showed an LC50 value of 10.88 mg/mL, whereas positive control (K2Cr2O7) showed LC50 59.97 µg/mL suggesting the less toxic property of the ethanolic extract. In-vitro antimicrobial activity of ethanolic extract of Rosenvingea sp. was investigated against gram-positive and gram-negative bacteria species (Staphylococcus, Bacillus, Pseudomonas, Salmonella, and Klebsiella) by agar disc diffusion method. The highest antibacterial activity was noticed against Klebsiella pneumonia, Pseudomonas aeruginosa, Staphylococcus hominis with a zone of inhibition of 5.00±1.00 mm, 3.66±0.57 mm, and 3.33±0.57 mm, respectively. This is the first study on Rosenvingea sp. from the Bay of Bengal, reporting its phytochemical, antioxidant, and antimicrobial potentiality. However, more study is required to elucidate its commercial viability in the food and medicine industries. \u0000J. Bangladesh Acad. Sci. 45(1); 59-71: June 2021","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88430172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Economically reproducible surface-enhanced Raman spectroscopy of different compounds in thin film 薄膜中不同化合物的经济可重复性表面增强拉曼光谱

Journal of Bangladesh Academy of Sciences Pub Date : 2021-07-15 DOI: 10.3329/JBAS.V45I1.54255

A. Islam, F. Tasneem, Z. H. Khan, Asif Rakib, S. Farhad, A. Talukder, A. Haider, Wahadoszamen

{"title":"Economically reproducible surface-enhanced Raman spectroscopy of different compounds in thin film","authors":"A. Islam, F. Tasneem, Z. H. Khan, Asif Rakib, S. Farhad, A. Talukder, A. Haider, Wahadoszamen","doi":"10.3329/JBAS.V45I1.54255","DOIUrl":"https://doi.org/10.3329/JBAS.V45I1.54255","url":null,"abstract":"We report herein an economically cheap and functionally stable surfaceenhanced Raman scattering (SERS) protocol of two photoactive pigments Rhodamine 6G (R6G) and Kiton Red (KR), implemented in thin films of silver (Ag) and gold (Au) nanoparticles (AgNPs and AuNPs). Both commercially available and chemically synthesized nanoparticles were used. The suitability of the nanoparticles toward SERS activity was tested through UV-visible absorption spectroscopy and scanning electron microscopy (SEM). The AgNPs and AuNPs based SERS substrates in the form of films were fabricated onto square-sized aluminum(Al) plates by simple drop deposition of colloidal nanoparticles solution onto their polished surfaces. The prepared nanoparticle films were sufficiently dried and coated further with the probe (R6G and KR) molecules by employing the identical deposition technique. The enhanced Raman signals of R6G and KR in such composite film structures were then recorded through a custom-built dispersive Raman spectrometer with He-Ne laser excitation at 632.8 nm. Our AgNPsfilm-based SERS protocol could yield the magnitude of the Raman signal enhancement up to 104 times for both R6G and KR. Moreover, AuNPs-based film was found to be less efficient toward the Raman enhancement of both compounds. Our SERS substrates can be easily fabricated, and SERS spectra are reproducible and stable, allowing one to consistently get a reproducible result even after 6 months. \u0000J. Bangladesh Acad. Sci. 45(1); 1-11: June 2021","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76411206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Late Professor Syed Nurun Nabi

Journal of Bangladesh Academy of Sciences Pub Date : 2021-07-15 DOI: 10.3329/JBAS.V45I1.54863

M. M. Rahman

引用次数: 0