Pub Date : 2024-06-13DOI: 10.3329/jbas.v48i1.73005
Akm Azharul Islam
A significant advancement in materials science has been made with the 2D MXene nanomaterials that were etched from their parent 3D MAX phases. Layered ternary carbide, nitride, and boride compounds with the general formula Mn+1AXn (n=1,2, 3,4 ...) make up the 3D MAX phase materials, where A is an element of Group IIA or IIIA, M is an early transition metal, and X is either C, N, or B. MXene's chemical formula is Mn+1Xn, whereas that of the precursor is Mn+1AXn. The MAX materials have a distinct set of properties that are similar to those of metal and ceramic. They are helpful in the development of high-efficiency engines, thermal systems that can withstand damage, fatigue resistance enhancement, and high-temperature rigidity retention technologies. The 2D MXenes are potentially described as a „wonder material‟ in the class of nanomaterials. Because of their intriguing mechanical properties resulting from their atomically thin dimensions, as well as their unusual electrical and optical properties, these have become the focus of materials research in recent years. These nanomaterials are multilayer electrically conductive materials that are comparable to multilayer graphene. They have been discovered to be beneficial for a variety of applications, such as energy storage materials, composite reinforcement, chemical, environmental, and biological sensors, and electronic devices. The recent advancements in the use of nanomaterials in optoelectronics, field-effect transistors, transparent conductive electrodes and shielding against electromagnetic interference, energy storage, and other fields have been extensively documented. The potential of nanomaterials as a novel ceramic photothermal agent employed in cancer therapy has been revealed by a very recent study on Ti3C2 MXene. The same 2D nanomaterial can be used in water desalination and purification membranes since it has antibacterial qualities and is resistant to bio fouling. The MXene-based piezoresistive sensor is also capable of detecting weak pressures and the slight bending-release actions of humans. It can be applied to recover lost frictional energy from, say, walking or typing-related muscular contractions. Since MAX phases are precursors to MXenes, the former are valuable due to the growing interest in the latter. This review provides an overview of the literature, including the author's own work, from the groundbreaking MXene publication to the present. It provides information on the characteristics, synthesis, crystal structure, and current and future uses of the new wonder materials as well as the MAX phases. J. Bangladesh Acad. Sci. 48(1); 1-25: June 2024
从母体三维 MAX 相中蚀刻出的二维 MXene 纳米材料在材料科学领域取得了重大进展。通式为 Mn+1AXn （n=1,2,3,4......）的层状三元碳化物、氮化物和硼化物化合物构成了三维 MAX 相材料，其中 A 是 IIA 族或 IIIA 族元素，M 是早期过渡金属，X 是 C、N 或 B。MAX 材料具有一系列与金属和陶瓷相似的特性。它们有助于开发高效发动机、可承受损坏的热系统、抗疲劳性增强和高温刚性保持技术。二维 MXenes 有可能被称为纳米材料中的 "神奇材料"。由于其原子级的超薄尺寸所带来的奇妙机械特性，以及不同寻常的电学和光学特性，它们已成为近年来材料研究的焦点。这些纳米材料是与多层石墨烯相当的多层导电材料。研究发现，它们可用于多种应用，如储能材料、复合材料加固、化学、环境和生物传感器以及电子设备。最近，纳米材料在光电子学、场效应晶体管、透明导电电极、电磁干扰屏蔽、能量存储和其他领域的应用取得了长足的进步。最近一项关于 Ti3C2 MXene 的研究揭示了纳米材料作为新型陶瓷光热剂用于癌症治疗的潜力。同样的二维纳米材料也可用于海水淡化和净化膜，因为它具有抗菌和抗生物污垢的特性。基于 MXene 的压阻传感器还能检测微弱的压力和人类轻微的弯曲释放动作。它可用于恢复行走或打字时肌肉收缩所损失的摩擦能量。由于 MAX 相是 MXenes 的前体，前者的价值在于人们对后者的兴趣与日俱增。本综述概述了从开创性的 MXene 出版至今的文献，包括作者本人的工作。它提供了有关新奇材料以及 MAX 相的特性、合成、晶体结构、当前和未来用途的信息。J. Bangladesh Acad：2024 年 6 月
{"title":"New wonder materials - exciting technological horizon","authors":"Akm Azharul Islam","doi":"10.3329/jbas.v48i1.73005","DOIUrl":"https://doi.org/10.3329/jbas.v48i1.73005","url":null,"abstract":"A significant advancement in materials science has been made with the 2D MXene nanomaterials that were etched from their parent 3D MAX phases. Layered ternary carbide, nitride, and boride compounds with the general formula Mn+1AXn (n=1,2, 3,4 ...) make up the 3D MAX phase materials, where A is an element of Group IIA or IIIA, M is an early transition metal, and X is either C, N, or B. MXene's chemical formula is Mn+1Xn, whereas that of the precursor is Mn+1AXn. The MAX materials have a distinct set of properties that are similar to those of metal and ceramic. They are helpful in the development of high-efficiency engines, thermal systems that can withstand damage, fatigue resistance enhancement, and high-temperature rigidity retention technologies. The 2D MXenes are potentially described as a „wonder material‟ in the class of nanomaterials. Because of their intriguing mechanical properties resulting from their atomically thin dimensions, as well as their unusual electrical and optical properties, these have become the focus of materials research in recent years. These nanomaterials are multilayer electrically conductive materials that are comparable to multilayer graphene. They have been discovered to be beneficial for a variety of applications, such as energy storage materials, composite reinforcement, chemical, environmental, and biological sensors, and electronic devices. The recent advancements in the use of nanomaterials in optoelectronics, field-effect transistors, transparent conductive electrodes and shielding against electromagnetic interference, energy storage, and other fields have been extensively documented. The potential of nanomaterials as a novel ceramic photothermal agent employed in cancer therapy has been revealed by a very recent study on Ti3C2 MXene. The same 2D nanomaterial can be used in water desalination and purification membranes since it has antibacterial qualities and is resistant to bio fouling. The MXene-based piezoresistive sensor is also capable of detecting weak pressures and the slight bending-release actions of humans. It can be applied to recover lost frictional energy from, say, walking or typing-related muscular contractions. Since MAX phases are precursors to MXenes, the former are valuable due to the growing interest in the latter. This review provides an overview of the literature, including the author's own work, from the groundbreaking MXene publication to the present. It provides information on the characteristics, synthesis, crystal structure, and current and future uses of the new wonder materials as well as the MAX phases.\u0000J. Bangladesh Acad. Sci. 48(1); 1-25: June 2024","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"53 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141349534","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}
Pub Date : 2024-06-13DOI: 10.3329/jbas.v48i1.71278
M. S. I. Sujan, M. R. Alamin, MA Sattar, Shefael K Joarder, A. Tariq, A. K. Basak
The experimental angular distributions of differential cross-section (CS), vector analyzing power (iT11) and tensor analyzing powers (T20, T21 and T22 ) for the 12C(6Li, 6Li)12C elastic scattering at laboratory energy of 30 MeV are simultaneously analyzed in the structure of simple optical model (OM) using shallow Non-Monotonic (NM) and deep Monotonic Woods-Saxon (MWS) potentials. The Pauli-laden energy density functional (EDF) theory which results in NM potentials is also discussed. Equally good fits to the CS, T20, T21, and T22 data are obtained using both NM and MWS potentials. But iT11data is only reproduced well using NM potentials in OM. The conclusion is that the shallow NM potentials seem better than the deep MWS for simultaneous description of the CS, iT11, T20, T21 and T22 data. J. Bangladesh Acad. Sci. 48(1); 99-109: June 2024
{"title":"Comparison of non-monotonic and monotonic potentials for cross-sections and analyzing powers of 6Li elastic scattering on 12C at 30 MeV","authors":"M. S. I. Sujan, M. R. Alamin, MA Sattar, Shefael K Joarder, A. Tariq, A. K. Basak","doi":"10.3329/jbas.v48i1.71278","DOIUrl":"https://doi.org/10.3329/jbas.v48i1.71278","url":null,"abstract":"The experimental angular distributions of differential cross-section (CS), vector analyzing power (iT11) and tensor analyzing powers (T20, T21 and T22 ) for the 12C(6Li, 6Li)12C elastic scattering at laboratory energy of 30 MeV are simultaneously analyzed in the structure of simple optical model (OM) using shallow Non-Monotonic (NM) and deep Monotonic Woods-Saxon (MWS) potentials. The Pauli-laden energy density functional (EDF) theory which results in NM potentials is also discussed. Equally good fits to the CS, T20, T21, and T22 data are obtained using both NM and MWS potentials. But iT11data is only reproduced well using NM potentials in OM. The conclusion is that the shallow NM potentials seem better than the deep MWS for simultaneous description of the CS, iT11, T20, T21 and T22 data.\u0000J. Bangladesh Acad. Sci. 48(1); 99-109: June 2024","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"5 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141349626","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}
Pub Date : 2023-12-21DOI: 10.3329/jbas.v47i2.65837
Mohammad Mohaddes Hossen, Md Abdullah Al Mamun, Md Mizanur Rahman, M. A. Karim
A field trial was laid out to mitigate the detrimental consequences of waterlogging (WL) on morpho-physiology and productivity of soybeans through potassium (K) application. Soybean genotypes AGS383 and G00166 were tested against 4 days of WL at the flowering stage. The K fertilizer was applied as (i) basal (full dose) and (ii) basal (50%) + top dress (50%) after the termination of a flood. The experiment's results showed that the WL negatively affected leaf greenness, water and chlorophyll (Chl) content, plant height, nodule and pod production, and soybean seed yield. However, the split application of K fertilizer minimized the detrimental effect of WL in the case of AGS383. This genotype produced taller plants, contained more Chl and water, higher nodules, bold seeds, and accumulated higher amounts of mineral nutrients in their grains under WL condition with K as basal + top dress after the termination of a flood. J. Bangladesh Acad. Sci. 47(2); 155-167: December 2023
{"title":"Exogenous application of potassium fertilizer alleviates the detrimental effect of waterlogging on soybean","authors":"Mohammad Mohaddes Hossen, Md Abdullah Al Mamun, Md Mizanur Rahman, M. A. Karim","doi":"10.3329/jbas.v47i2.65837","DOIUrl":"https://doi.org/10.3329/jbas.v47i2.65837","url":null,"abstract":"A field trial was laid out to mitigate the detrimental consequences of waterlogging (WL) on morpho-physiology and productivity of soybeans through potassium (K) application. Soybean genotypes AGS383 and G00166 were tested against 4 days of WL at the flowering stage. The K fertilizer was applied as (i) basal (full dose) and (ii) basal (50%) + top dress (50%) after the termination of a flood. The experiment's results showed that the WL negatively affected leaf greenness, water and chlorophyll (Chl) content, plant height, nodule and pod production, and soybean seed yield. However, the split application of K fertilizer minimized the detrimental effect of WL in the case of AGS383. This genotype produced taller plants, contained more Chl and water, higher nodules, bold seeds, and accumulated higher amounts of mineral nutrients in their grains under WL condition with K as basal + top dress after the termination of a flood. \u0000J. Bangladesh Acad. Sci. 47(2); 155-167: December 2023","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"53 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138948696","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}
The Bright Babul Blue, scientifically known as Azanus ubaldus (Stoll, 1782), has been observed for the first time in the Premtoli Social Forestation Area (N 24.387555, E 88.404246), Godagari Upazila, Rajshahi district, Bangladesh. This finding adds to our understanding of the butterfly's distribution and underscores the importance of conserving the unique biodiversity within the Premtoli Social Forestation Area. J. Bangladesh Acad. Sci. 47(2); 277-278: December 2023
{"title":"A new addition of bright babul blue - Azanus ubaldus - stoll, 1782 (Lepidoptera: Lycaenidae) for Bangladesh","authors":"Akash Mojumdar, Md Naim Ur Rashid, Md. Imrul Kayes, Umma Kadija, Md Najmul Hossain","doi":"10.3329/jbas.v47i2.67774","DOIUrl":"https://doi.org/10.3329/jbas.v47i2.67774","url":null,"abstract":"The Bright Babul Blue, scientifically known as Azanus ubaldus (Stoll, 1782), has been observed for the first time in the Premtoli Social Forestation Area (N 24.387555, E 88.404246), Godagari Upazila, Rajshahi district, Bangladesh. This finding adds to our understanding of the butterfly's distribution and underscores the importance of conserving the unique biodiversity within the Premtoli Social Forestation Area.\u0000J. Bangladesh Acad. Sci. 47(2); 277-278: December 2023","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"49 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138949616","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}
Pub Date : 2023-12-21DOI: 10.3329/jbas.v47i2.68520
Md Abu Hanif Sarkar
We study doubly nonlinear parabolic equation with sign changing solutions. We establish the Hölder regularity of the singular parabolic equations within a parabolic domain. J. Bangladesh Acad. Sci. 47(2); 241-248: December 2023
{"title":"Interior regularity to the signed solution of the singular doubly nonlinear parabolic equations","authors":"Md Abu Hanif Sarkar","doi":"10.3329/jbas.v47i2.68520","DOIUrl":"https://doi.org/10.3329/jbas.v47i2.68520","url":null,"abstract":"We study doubly nonlinear parabolic equation with sign changing solutions. We establish the Hölder regularity of the singular parabolic equations within a parabolic domain.\u0000J. Bangladesh Acad. Sci. 47(2); 241-248: December 2023","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"13 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138953055","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}
Pub Date : 2023-12-21DOI: 10.3329/jbas.v47i2.67851
Nure Asma Lata, N. Parvez, Sumaiya Farah Khan
DCDC2 is a clinically significant protein causing a number of neurological disorders and, hence, is an important protein for analysis. In this study, multiple tools were employed to identify missense SNPs that are harmful to the protein itself and destabilize the interaction of this protein with tubulin subunits. After analyzing all 378 missense SNPs retrieved from the dbSNP database, thirteen were found to have harmful effects on the protein, which are L20P, R23L, G25W, G25R, D26E, I36N, G60E, P68S, G83R, T174I, L179R, R186G, V208E. Among these, four SNPs- T174I, L179R, R186G, and V208E were suggested to be significantly destabilizing for the interaction of the C-DC domain with microtubule, and three SNPs- L20P, D26E, and G83R for the interaction of N-DC domain with microtubule. Based on the total ΔΔG value, SNP R186G and L20P seem most destabilizing for the interaction of the C-DC and N-DC domains. These SNPs are found to affect the protein negatively by analysis using several computational tools. Genetic association and protein-protein interaction studies focused on these SNPs can reveal new findings about dyslexia or other neurodevelopmental disorders. J. Bangladesh Acad. Sci. 47(2); 181-193: December 2023
{"title":"In silico analysis of deleterious SNPs of human DCDC2 gene and their impacts on subsequent protein-protein interactions","authors":"Nure Asma Lata, N. Parvez, Sumaiya Farah Khan","doi":"10.3329/jbas.v47i2.67851","DOIUrl":"https://doi.org/10.3329/jbas.v47i2.67851","url":null,"abstract":"DCDC2 is a clinically significant protein causing a number of neurological disorders and, hence, is an important protein for analysis. In this study, multiple tools were employed to identify missense SNPs that are harmful to the protein itself and destabilize the interaction of this protein with tubulin subunits. After analyzing all 378 missense SNPs retrieved from the dbSNP database, thirteen were found to have harmful effects on the protein, which are L20P, R23L, G25W, G25R, D26E, I36N, G60E, P68S, G83R, T174I, L179R, R186G, V208E. Among these, four SNPs- T174I, L179R, R186G, and V208E were suggested to be significantly destabilizing for the interaction of the C-DC domain with microtubule, and three SNPs- L20P, D26E, and G83R for the interaction of N-DC domain with microtubule. Based on the total ΔΔG value, SNP R186G and L20P seem most destabilizing for the interaction of the C-DC and N-DC domains. These SNPs are found to affect the protein negatively by analysis using several computational tools. Genetic association and protein-protein interaction studies focused on these SNPs can reveal new findings about dyslexia or other neurodevelopmental disorders. J. Bangladesh Acad. Sci. 47(2); 181-193: December 2023","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"26 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139166074","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}
Pub Date : 2023-12-21DOI: 10.3329/jbas.v47i2.66872
M. N. M. Asif, Rashedul Islam, MA Goni, S. Ganguli, Ashok Kumar Chakraborty, Mahbub Kabir, Md. Abdus Sabur
This study investigates the effectiveness of oyster mushroom (Pleurotus platypus) for the removal of Cr(III) and Cr(VI) from aqueous solutions by conducting a series of batch adsorption experiments. Results from the adsorption pH envelope experiments show that while the adsorption of Cr(III) increases with increasing pH, the adsorption of Cr(VI) decreases as the pH rises. These two distinct pH envelope patterns for Cr(III) and Cr(VI) suggest that the adsorption processes are primarily driven by the electrostatic force of attractions followed by the ligand exchange process. Findings from the adsorption isotherm experiments demonstrate that chromium binding to the adsorbent surface is better described by the Freundlich model than the Langmuir model, underscoring the presence of multiple surface binding sites. The study highlights the significance of identifying dominant chromium species before they are subjected to adsorptive removal from contaminated waters. J. Bangladesh Acad. Sci. 47(2); 267-275: December 2023
{"title":"Speciation of Cr(III) and Cr(VI) in aqueous solution and their removal by oyster mushroom biomass","authors":"M. N. M. Asif, Rashedul Islam, MA Goni, S. Ganguli, Ashok Kumar Chakraborty, Mahbub Kabir, Md. Abdus Sabur","doi":"10.3329/jbas.v47i2.66872","DOIUrl":"https://doi.org/10.3329/jbas.v47i2.66872","url":null,"abstract":"This study investigates the effectiveness of oyster mushroom (Pleurotus platypus) for the removal of Cr(III) and Cr(VI) from aqueous solutions by conducting a series of batch adsorption experiments. Results from the adsorption pH envelope experiments show that while the adsorption of Cr(III) increases with increasing pH, the adsorption of Cr(VI) decreases as the pH rises. These two distinct pH envelope patterns for Cr(III) and Cr(VI) suggest that the adsorption processes are primarily driven by the electrostatic force of attractions followed by the ligand exchange process. Findings from the adsorption isotherm experiments demonstrate that chromium binding to the adsorbent surface is better described by the Freundlich model than the Langmuir model, underscoring the presence of multiple surface binding sites. The study highlights the significance of identifying dominant chromium species before they are subjected to adsorptive removal from contaminated waters.\u0000J. Bangladesh Acad. Sci. 47(2); 267-275: December 2023","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"41 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138950042","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}
Pub Date : 2023-12-21DOI: 10.3329/jbas.v47i2.68474
M. F. Jaman, Md. Fazle Rabbe, Arnob Saha, A. R. Shome, M. M. Alam
Monitoring wildlife communities in protected areas is pivotal to successful conservation efforts. This study employed a direct observations-based approach to examine the diversity and community structure of wildlife in four protected deciduous national parks (Ramsagar, Birganj, Singra, and Nawabganj) in the northern Dinajpur district of Bangladesh. This study assessed the wildlife assemblage structures by measuring α diversity and β diversity. This research recorded a total of 159 wildlife species under 29 orders. Singra National Park displayed the highest species richness (N=73) and was found to be more diverse (H=3.36 ± 0.16) and even in distribution (J=0.9 ± 0.01). Analysis of Similarity test showed significant differences across all study sites (R=0.5216; p=0.0001). Whittaker Plot ranked Dendrocygna javanica as dominating, species making the community uneven. We found significant differences in species richness among seasons (F2, 9=17.8, p=0.0001). For example, winter and rainy seasons were significantly richer over summer. This study identified profound human intrusions, which could potentially impact wildlife communities in the study area. Our findings underscore the conservation efforts to safeguard the threatened species in the study area. J. Bangladesh Acad. Sci. 47(2); 249-265: December 2023
{"title":"Wildlife diversity and community structure in northern deciduous forest of Bangladesh","authors":"M. F. Jaman, Md. Fazle Rabbe, Arnob Saha, A. R. Shome, M. M. Alam","doi":"10.3329/jbas.v47i2.68474","DOIUrl":"https://doi.org/10.3329/jbas.v47i2.68474","url":null,"abstract":"Monitoring wildlife communities in protected areas is pivotal to successful conservation efforts. This study employed a direct observations-based approach to examine the diversity and community structure of wildlife in four protected deciduous national parks (Ramsagar, Birganj, Singra, and Nawabganj) in the northern Dinajpur district of Bangladesh. This study assessed the wildlife assemblage structures by measuring α diversity and β diversity. This research recorded a total of 159 wildlife species under 29 orders. Singra National Park displayed the highest species richness (N=73) and was found to be more diverse (H=3.36 ± 0.16) and even in distribution (J=0.9 ± 0.01). Analysis of Similarity test showed significant differences across all study sites (R=0.5216; p=0.0001). Whittaker Plot ranked Dendrocygna javanica as dominating, species making the community uneven. We found significant differences in species richness among seasons (F2, 9=17.8, p=0.0001). For example, winter and rainy seasons were significantly richer over summer. This study identified profound human intrusions, which could potentially impact wildlife communities in the study area. Our findings underscore the conservation efforts to safeguard the threatened species in the study area.\u0000J. Bangladesh Acad. Sci. 47(2); 249-265: December 2023","PeriodicalId":15109,"journal":{"name":"Journal of Bangladesh Academy of Sciences","volume":"82 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138951305","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}
Pub Date : 2023-12-21DOI: 10.3329/jbas.v47i2.67665
S. Pranto, Mohammad Asadul Haque, Md Fazlul Hoque
Transplanted (T) Aman rice covers most of the arable land in the south coastal region of Bangladesh, where nitrogen fertilizer requirement in the Ganges tidal water flooded ecosystem yet not determined. The on-farm experiment was conducted at Dumki Upazila, Patuakhali district of Bangladesh, during T. Aman rice season 2020. The three replicated randomized complete block design was used in the experiment. There were eight treatments with different rates of nitrogen, e.g., control (no nitrogen fertilizer), 18, 36, 54, 72, 90, 108, and 126 kg N ha-1, which was equivalent to 0, 20, 40, 60, 80, 100, 120 and 140% of the current recommended rate, respectively. The test variety of rice was BR23. An increase in nitrogen rates progressively increased the grain yield of rice. The highest yield of 5.04 t ha-1 was found in 54 kg N ha-1 rate. However, using a quadratic equation, the most optimum rate was 75 kg N ha-1, 17% lower than the current recommendation. Nitrogen amendment could increase T. Aman rice grain yield by only 35% over control under tidal water flooded conditions. The agronomic efficiency, recovery efficiency, and physiological efficiency of nitrogen were higher in lower rates of N and gradually decreased with the increase of the rate of N application. The present study recommends 75 kg N ha-1 for cultivating T. Aman rice (BR23) in tidal water flooded the south coastal ecosystem of Bangladesh. J. Bangladesh Acad. Sci. 47(2); 169-180: December 2023
移栽安缦水稻覆盖了孟加拉国南部沿海地区的大部分耕地，而恒河潮水淹没的生态系统对氮肥的需求尚未确定。2020 年移栽安缦水稻季节，在孟加拉国帕图阿卡利县 Dumki Upazila 进行了农场试验。试验采用三重复随机整群设计。共有 8 个不同氮肥施用量的处理，如对照（无氮肥）、18、36、54、72、90、108 和 126 千克氮（公顷-1），分别相当于当前推荐施用量的 0、20、40、60、80、100、120 和 140%。试验水稻品种为 BR23。氮肥用量的增加会逐步提高水稻的产量。氮肥用量为 54 千克/公顷时，产量最高，为 5.04 吨/公顷。然而，根据二次方程，最适宜的施氮量为 75 kg N ha-1，比目前的建议施氮量低 17%。在潮水淹没条件下，施氮仅能使缇香缦水稻比对照增产 35%。氮素的农艺效率、回收效率和生理效率在施氮量较低时较高，随着施氮量的增加而逐渐降低。本研究建议在潮水淹没的孟加拉国南部沿海生态系统中种植 T. Aman 水稻（BR23）时，施氮量为 75 公斤/公顷。47(2); 169-180：2023 年 12 月
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Pub Date : 2023-12-21DOI: 10.3329/jbas.v47i2.70506
Zahurul Karim
Abstract not available J. Bangladesh Acad. Sci. 47(2); December 2023
摘要暂缺 J. Bangladesh Acad.47(2); December 2023
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