Journal of Bangladesh Academy of Sciences最新文献_第5页

Optimization of the cupric oxide nanoparticles synthesis by novel spondias mombin peel extract exhibited excellent peroxidase activity 新型山楂皮提取物合成氧化铜纳米颗粒的优化研究

Journal of Bangladesh Academy of Sciences Pub Date : 2022-12-31 DOI: 10.3329/jbas.v46i2.59895

Md. Rajibul Akanda, Umme Habiba Ema, M. Haque, M. Hasan, Md Al amin Miah

{"title":"Optimization of the cupric oxide nanoparticles synthesis by novel spondias mombin peel extract exhibited excellent peroxidase activity","authors":"Md. Rajibul Akanda, Umme Habiba Ema, M. Haque, M. Hasan, Md Al amin Miah","doi":"10.3329/jbas.v46i2.59895","DOIUrl":"https://doi.org/10.3329/jbas.v46i2.59895","url":null,"abstract":"This study describes a straightforward protocol for synthesizing cupric oxide nanoparticles from the peel extract of Spondias mombin. The CuO NPs were produced in a basic H2O solution as cubic-shaped, homogenous nanoparticles with excellent peroxidase activity without taking any special precautions. The influence of the concentration of the peel extract, temperature as well as the synthesis medium on CuO NPs production has been investigated extensively. The typical UV-visible absorption maxima observed at wavelengths of 279 and 383 nm observed in spectrophotometry confirmed the formation of CuO NPs. Moreover, the homogeneity, shape (cubic), and size (approximately averaged ⁓31nm (29nm⁓38nm)) of the synthesized CuO nanoparticles under optimum conditions were confirmed through the SEM technique. Besides, its elemental compositions, capping agent, and crystallinity were investigated through EDS, FT-IR and XRD. Finally, in the presence of hydrogen peroxide (H2O2), the as-prepared CuO NPs demonstrated excellent peroxidase activity against 3,3',5,5'-tetramethylbenzidine (TMB).\u0000J. Bangladesh Acad. Sci. 46(2); 135-145: December 2022 ","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76450622","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

Total variation denoising and Euclidean distance based distributed temperature monitoring in Brillouin optical time-domain analysis sensors 基于全变差去噪和欧氏距离的布里渊光时域分析传感器分布式温度监测

Journal of Bangladesh Academy of Sciences Pub Date : 2022-12-31 DOI: 10.3329/jbas.v46i2.63046

Taskin Sakin, Tanbin Ahmed, A. Azad

{"title":"Total variation denoising and Euclidean distance based distributed temperature monitoring in Brillouin optical time-domain analysis sensors","authors":"Taskin Sakin, Tanbin Ahmed, A. Azad","doi":"10.3329/jbas.v46i2.63046","DOIUrl":"https://doi.org/10.3329/jbas.v46i2.63046","url":null,"abstract":"The performance of Brillouin optical time domain analysis (BOTDA) sensors is largely deteriorated due to the poor signal-to-noise ratio (SNR) of Brillouin gain spectra (BGSs) collected from the BOTDA experiment. The fast monitoring of distributed temperature using BOTDA sensors is also vital for many longdistant applications. To cope with these requirements, this paper proposes total variation denoising (TVD) and Euclidean distance-based pattern recognition (TEPR) for high-performance BOTDA sensors. The performances of TEPR are analyzed explicitly, and rigorous comparisons have been made with traditional nonlinear least squares fitting (NLSF). The experimentally demonstrated results signify that the proposed TEPR can improve the measurement uncertainty by up to ~55% compared to NLSF without worsening the experimental spatial resolution. The signal processing for using TEPR is also ~4 times faster than that for using NLSF. Hence, the proposed technique is an efficient and reliable alternative for the fast and accurate monitoring of distributed temperature in BOTDA sensors. J.\u0000Bangladesh Acad. Sci. 46(2); 193-202: December 2022","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"126 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90568768","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

Growth and yield response of Kenaf (Hibiscus cannabinus L.) seed production to different sowing times 红麻制种对不同播期生长及产量的响应

Journal of Bangladesh Academy of Sciences Pub Date : 2022-12-31 DOI: 10.3329/jbas.v46i2.63418

M. Debnath, Md Maksuder Rahman, S. K. Biswas

引用次数: 0

Etiologies and antibiotic resistance patterns of acute bloodstream infections by gram-negative bacterial isolates in a tertiary care hospital, Sirajganj, Bangladesh 孟加拉国Sirajganj一家三级保健医院中革兰氏阴性细菌分离株急性血流感染的病因和抗生素耐药性模式

Journal of Bangladesh Academy of Sciences Pub Date : 2022-12-31 DOI: 10.3329/jbas.v46i2.63417

M. Z. Abedin, Md Muhaymenul Islam, Md. Babul Aktar, Muhammad Irfanul Islam, Nowshin Tarannum, Laila Jarin, Zohora Fatema Tuz, Ahmed Abdullah Akhtar

{"title":"Etiologies and antibiotic resistance patterns of acute bloodstream infections by gram-negative bacterial isolates in a tertiary care hospital, Sirajganj, Bangladesh","authors":"M. Z. Abedin, Md Muhaymenul Islam, Md. Babul Aktar, Muhammad Irfanul Islam, Nowshin Tarannum, Laila Jarin, Zohora Fatema Tuz, Ahmed Abdullah Akhtar","doi":"10.3329/jbas.v46i2.63417","DOIUrl":"https://doi.org/10.3329/jbas.v46i2.63417","url":null,"abstract":"Bloodstream infections (BSI) are serious, life-threatening, and critical clinical conditions with high global human morbidity and mortality rates. This study aimed to determine the Gram-negative bacterial profiles and antimicrobial resistance patterns of acute bloodstream infections in rural patients. Three hundred forty-six blood samples were collected and analyzed with the BD BactecTM FX40 automated culture system, selective media culture, and biochemical parameters. Finally, antimicrobial susceptibility testing was performed using the disk diffusion method. The most common age group affected out of 51 cases was 41-60 years, with 20 patients (39.22%), and 1-15 years, with 2 patients (3.92%). Male patients were more susceptible (66.67%) than female patients. Among the isolates, E. coli was the most common, with 23 cases (45.1%); Cephradine was the most resistant antibiotic, and Imipenem was the most sensitive. Multiple drug-resistant pathogens were one of the most notable findings in our work. Our study will surely provide the best guide for properly treating antibacterial-resistant bacterial diseases and minimizing their critical mortality and morbidity.\u0000 J. Bangladesh Acad. Sci. 46(2); 185-191: December 2022 ","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79207555","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

The Reve’s Puzzle with single relaxation of the Divine rule 《雷夫的谜题》是关于神的规则的单一放松

Journal of Bangladesh Academy of Sciences Pub Date : 2022-12-31 DOI: 10.3329/jbas.v46i2.60444

A. Majumdar

引用次数: 0

Estimation of prolonged lifetimes of excited states of neutral oxygen atom (OI) by time-resolved laser-induced breakdown spectroscopy (TR-LIBS) 用时间分辨激光诱导击穿光谱(TR-LIBS)估计中性氧原子(OI)激发态延长寿命

Journal of Bangladesh Academy of Sciences Pub Date : 2022-12-31 DOI: 10.3329/jbas.v46i2.63416

A. Haider, N. Hoque, Arifur Rahaman, Zulfiqar Hasan Khan

{"title":"Estimation of prolonged lifetimes of excited states of neutral oxygen atom (OI) by time-resolved laser-induced breakdown spectroscopy (TR-LIBS)","authors":"A. Haider, N. Hoque, Arifur Rahaman, Zulfiqar Hasan Khan","doi":"10.3329/jbas.v46i2.63416","DOIUrl":"https://doi.org/10.3329/jbas.v46i2.63416","url":null,"abstract":"Lifetimes of the upper states of excited oxygen atoms corresponding to transitions to the common lower state in the case of the emission lines around 777 nm and 844 nm have been estimated by measuring the line intensities as a function of the delay time between the Q-switching of the laser and the opening of the window of the ICCD. In the case of the emission line around 777 nm, resulting from the transitions from the three very closely spaced upper energy levels, 2s2 2p3 (4S0) 3p5P3 (777.194 nm), 2s2 2p3 (4S0) 3p5P2 (777.417 nm) and 2s2 2p3 (4S0) 3p5P1 (777.539 nm) to the common lower energy level 2s2 2p3 (4S0) 3s5S2, the lifetime was measured to be 253 ns. Similarly, in the case of the emission-line around 844 nm, resulting from the transitions from the three very closely spaced upper energy levels 2s2 2p3 (4S0) 3p3P0 (844.625 nm), 2s2 2p3 (4S0) 3p3P2 (844.636 nm) and 2s2 2p3 (4S0) 3p3P1 (844.676 nm) to the common lower energy level 2p3 (4S0) 3s3S1, the lifetime was measured to be 278 ns by this technique. The measured lifetimes in our experiment, for both 777 nm and 844 nm atomic transition lines of oxygen (O), are almost nine times higher than the theoretical value. Self-absorption and radiation trapping are possible mechanisms responsible for the mismatch between measured and intrinsic lifetimes. Last but not least, utilizing the TR-LIBS technique is yet another incredible application to estimate the prolonged lifetime of closely spaced excited states of an atom in the presence of self-absorption and radiation trapping. The average plasma cooling temperature (excitation temperature) lifetime was found to be 1183 ns, which is compatible with the previously reported values.\u0000J. Bangladesh Acad. Sci. 46(2); 175-183: December 2022","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82483487","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

Changes in morpho-physiological and yield attributes of Sesamum indicum under waterlogging at different growth stages 涝渍对芝麻不同生育期形态生理及产量属性的影响

Journal of Bangladesh Academy of Sciences Pub Date : 2022-12-31 DOI: 10.3329/jbas.v46i2.63415

T. I. Anee, P. K. Biswas, M. Hasanuzzaman

引用次数: 0

Optimization of Interval Cost Multi-objective Transportation Problem in Uncertain Parameters: A Modified Least-Cost Method 不确定参数下区间成本多目标运输问题的优化:一种改进的最小成本法

Journal of Bangladesh Academy of Sciences Pub Date : 2022-12-31 DOI: 10.3329/jbas.v46i2.62168

Md. Tariqul Islam, M. Miah

引用次数: 0

Late Professor Hironmoy Sen Gupta (1934-2022) 已故教授Hironmoy Sen Gupta (1934-2022)

Journal of Bangladesh Academy of Sciences Pub Date : 2022-06-29 DOI: 10.3329/jbas.v46i1.60343

M. S. Ali

引用次数: 0

Fate of heavy metals in Swarna rice after traditional cooking and submerged fermentation linked to bacterial interactions 传统烹饪和浸没发酵后斯瓦纳米中重金属的命运与细菌的相互作用有关

Journal of Bangladesh Academy of Sciences Pub Date : 2022-06-29 DOI: 10.3329/jbas.v46i1.59177

M. Haque, M. Rahman, J. Ferdousi, Md. Bokhtiar Rahman, A. Halilu

引用次数: 1