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Human and ecological risks of metals in soils under different land-use types in an urban environment of Bangladesh

Pedosphere 2020年第2期30卷 201-213页

作者： md.Saiful islam md.Kawser AHMED md.Habibullah Al-MAMUN Dennis Wayne EATON Department of Soil Science Patuakhali Science and Technology UniversityDumkiPatuakhali 8602Bangladesh Graduate School of Environment and Information Sciences Yokohama National University79-7 TokiwadaiHodogaya-kuYokohamaKanagawa 240-8501Japan Department of Oceanography University of DhakaDhaka 1000Bangladesh Department of Fisheries University of DhakaDhaka 1000Bangladesh Contract Faculty Rutgers UniversityNew BrunswickNJ 08901-8554USA

Trace metal contamination in soil is of great concern owing to its long persistence in the environment and toxicity to humans and other *** of six potentially toxic trace metals,Cr,Ni,Cu,As,Cd,and Pb,in urban soils were measured in Dhaka City,*** from different land-use types,namely,agricultural field,park,playground,petrol station,metal workshop,brick field,burning sites,disposal sites of household waste,garment waste,electronic waste,and tannery wast,and construction waste demolishing sites,were *** concentration ranges of Cr,Ni,Cu,As,Pb,and Cd in soils were 2.4–1258,8.3–1044,9.7–823,8.7–277,1.8–80,and 13–842 mg kg^-1,*** concentrations of metals were subsequently used to establish hazard quotients(HQs)for the adult *** metal HQs decreased in the order of As>Cr>Pb>Cd>Ni>*** was the most vital exposure pathway of studied metals from soils followed by dermal contact and *** range of pollution load index(PLI)was 0.96–17,indicating severe contamination of soil by trace *** the comprehensive potential ecological risk(PER),soils from all land-use types showed considerable to very high ecological *** findings of this study revealed that in the urban area studied,soils of some land-use types were severely contaminated with trace ***,it is suggested that more attention should be paid to the potential health risks to the local inhabitants and ecological risk to the surrounding ecosystems.

关键词： hazard quotient health risk land use potential ecological risk soil pollution trace metals urban soil

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Antioxidant,antibacterial and cytotoxic effects of the phytochemicals of whole Leucas aspera extract

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Asian Pacific Journal of Tropical Biomedicine 2013年第4期3卷 273-279页

作者： md Atiar Rahman md Saiful islam Department of Biochemistry and Molecular Biology University of ChittagongChittagong-4331Bangladesh Department of Biochemistry School of BiochemistryGenetics and MicrobiologyUniversity of KwaZulu-Natal.(Westville Campus)Durban 4000South Africa

Objective:To investigate the antioxidant,antibacterial and cytotoxic activity of whole Leucas aspera(Labiatae)(***)alcoholic ***:Whole *** powder was extracted by absolute ethanol(99.50%).The ethanolic extract was subjected to antioxidant,antibacterial and brine shrimp lethality ***:The extract showed potent radical scavenging effect(antioxidant)with IC_(50)value of(99.58±1.22)μg/mL which was significant(P<0.01)in comparison to ascorbic acid with IC_(50)value of(1.25±0.95)μg/*** case of antibacterial screening,the extract showed notable antibacterial effect against the tested microbial ***(P<0.05)zone of inhibitions against Gram positive Bacillus subtilis[(12.00±1.32)mm]and Bacillus megaterium[(13.00±1.50)mm],Staphylococcus aureus[(8.00±0.50)mm]and Gram negative Salmonella typhi[(6.00±0.50)mm],Salmonella paratyphi[(8.00±1.00)mm],Shigella dysenteriae[(9.00±1.32)mm]and Vibrio cholerae[(9.00±0.66)mm]was *** brine shrimp lethality bioassay,the extract showed the LC_(50)value as(181.68±2.15)μg/mL which was statistically significant(P<0.01)compared to positive control vincristine sulfate[LC_(50)=(0.76±0.04)μg/mL].Conclusions:The results demonstrate that the ethanolic extract of *** could be used as antibacterial,pesticidal and various pharmacologic actives.

关键词： Leucas aspera Radical scavenging Antibacterial Cytotoxic Probit

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Seasonal influence of freshwater discharge on spatio-temporal variations in primary productivity, sea surface temperature, and euphotic zone depth in the northern Bay of Bengal

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Acta Oceanologica Sinica 2024年第6期43卷 1-14页

作者： Hafez Ahmad Felix Jose md.Simul Bhuyan md.Nazrul islam Padmanava Dash Geosystems Research Institute/Department of Geosciences Mississippi State UniversityStarkville 39759USA Department of Oceanography University of ChittagongChittagong 4331Bangladesh Department of Marine&Earth Sciences Florida Gulf Coast UniversityFort Myers 33965USA Bangladesh Oceanographic Research Institute Cox’s Bazar 4730Bangladesh Faculty of Marine Sciences&Fisheries Institute of Marine SciencesUniversity of ChittagongChittagong 4331Bangladesh Department of Geography and Environment Jahangirnagar UniversityDhaka 1342Bangladesh Department of Geosciences Mississippi State UniversityStarkville 39759USA

Ocean productivity is the foundation of marine food web,which continuously removes atmospheric carbon dioxide and supports life at sea and on ***-temporal variability of net primary productivity(NPP),sea surface temperature(SST),sea surface salinity(SSS),mixed layer depth(MLD),and euphotic zone depth(EZD) in the northern B ay of Bengal(BoB) during three monsoon seasons were examined in this study based on remote sensing data for the period 2005 to *** compare the NPP distribution between the coastal zones and open BoB,the study area was divided into five zones(Z1-Z5).Results suggest that most productive zones Z2 and Zl are located at the head bay area and are directly influenced by freshwater discharge together with riverine sediment and nutrient *** Z1-Z5,the NPP ranges from 5 315.38 mg/(m^(2)·d) to 346.7 mg/(m^(2)·d)(carbon,since then the same).The highest monthly average NPP of 5 315.38 mg/(m^(2)·d) in February and 5 039.36 mg/(m^(2)·d) in June were observed from Z2,while the lowest monthly average of 346.72 mg/(m^(2)·d) was observed in March from Z4,which is an oceanic *** values vary from 6-154 m for the study area,and it has an inverse correlation with NPP *** is deeper during the summer season and shallower during the wintertime,with a corresponding increase in *** the year,monthly SST shows slight fluctuation for the entire study area,and statistical analysis shows a significant correlation among NPP,and EZD,overall positive between NPP and MLD,whereas no significant correlation among SSS,and SST for the northern ***-term trends in SST and productivity were significantly po sitive in head bay zones but negatively productive in the open *** findings in this study on the distribution of NPP,SST,SSS,MLD,and EZD and their seasonal variability in five different zones of BoB can be used to further improve the management of marine resources and overall environmental condition in response to clim

关键词： chlorophyll a sea surface temperature euphotic zone depth primary productivity Ganges-Brahmaputra ocean color Bay of Bengal monsoon

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Regulation of regeneration in Arabidopsis thaliana

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aBIOTECH 2023年第4期4卷 332-351页

作者： md Khairul islam Sai Teja Mummadi Sanzhen Liu Hairong Wei Computational Science and Engineering Program Michigan Technological UniversityHoughtonMI 49931USA Computer Science Michigan Technological UniversityHoughtonMI 49931USA Department of Plant Pathology Kansas State UniversityManhattanKS 66506USA College of Forest Resources and Environmental Science Michigan Technological UniversityHoughtonMI 49931USA

We employed several algorithms with high efficacy to analyze the public transcriptomic data,aiming to identify key transcription factors(TFs)that regulate regeneration in Arabidopsis ***,we utilized CollaborativeNet,also known as TF-Cluster,to construct a collaborative network of all TFs,which was subsequently decomposed into many subnetworks using the Triple-Link and Compound Spring Embedder(CoSE)*** analysis of these subnetworks led to the identification of nine subnetworks closely associated with *** further applied principal component analysis and gene ontology(GO)enrichment analysis to reduce the subnetworks from nine to three,namely subnetworks 1,12,and *** for TF-binding sites in the promoters of the co-expressed and co-regulated(CCGs)genes of all TFs in these three subnetworks and Triple-Gene Mutual Interaction analysis of TFs in these three subnetworks with the CCGs involved in regeneration enabled us to rank the TFs in each ***,six potential candidate TFs-WOx9A,LEC2,PGA37,WIP5,PEI1,and AIL1 from subnetwork 1-were identified,and their roles in somatic embryogenesis(GO:0010262)and regeneration(GO:0031099)were discussed,so were the TFs in Subnetwork 12 and 17 associated with *** TFs identified were also assessed using the CIS-BP database and Expression *** analyses suggest some novel TFs that may have regulatory roles in regeneration and embryogenesis and provide valuable data and insights into the regulatory mechanisms related to *** tools and the procedures used here are instrumental for analyzing high-throughput transcriptomic data and advancing our understanding of the regulation of various biological processes of interest.

关键词： Regeneration Pluripotency Transcription factor Collaborative network

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Phototropin-and photosynthesis-dependent mitochondrial positioning in Arabidopsis thaliana mesophyll cells^FA

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Journal of Integrative Plant Biology 2020年第9期62卷 1352-1371页

作者： md Sayeedul islam Toan Van Nguyen Wataru Sakamoto Shingo Takagi Department of Biological Sciences Graduate School of ScienceOsaka UniversityMachikaneyama-cho 1-1ToyonakaOsaka 560-0043Japan Agricultural Genetics Institute National Key Laboratory for Plant Cell BiotechnologyPham Van Dong roadBac Tu Liem districtHa NoiVietnam Institute of Plant Science and Resources Okayama UniversityKurashikiOkayama 710-0046Japan

Mitochondria are frequently observed in the vicinity of chloroplasts in photosynthesizing cells, and this association is considered necessary for their metabolic in-teractions. We previously reported that, in leaf palisade cel s of Arabidopsis thaliana, mitochondria exhibit blue-light-dependent redistribution together with chloroplasts, which conduct accumulation and avoidance responses under the control of blue-light receptor phototropins. In this study, precise motility analyses by fluorescent micro-scopy revealed that the individual mitochondria in palisade cel s, labeled with green fluorescent protein, exhibit typical stop-and-go movement. When exposed to blue light, the velocity of moving mitochondria increased in 30 min, whereas after 4 h, the frequency of stoppage of mi-tochondrial movement markedly increased. Using different mutant plants, we concluded that the presence of both phototropin1 and phototropin2 is necessary for the early acceleration of mitochondrial movement. On the contrary, the late enhancement of stoppage of mitochondrial movement occurs only in the presence of phototropin2 and only when intact photosynthesis takes place. A plasma-membrane ghost assay suggested that the stopped mi-tochondria are firmly adhered to chloroplasts. These re-sults indicate that the physical interaction between mi-tochondria and chloroplasts is cooperatively mediated by phototropin2- and photosynthesis-dependent signals. The present study might add novel regulatory mechanism for light-dependent plant organel e interactions.

关键词： tropin Arabidopsis movement

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Bilateral Coupled Epsilon Negative Metamaterial for Dual Band Wireless Communications

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Computers, Materials & Continua 2022年第4期71卷 1263-1281页

作者： md Mhedi Hasan Mohammad Tariqul islam md Moniruzzaman Mohd Hafiz Uddin Norsuzlin Binti Mohd Sahar md Samsuzzaman Department of Electrical Electronic and Systems Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaSelangor43600Malaysia Space Science Centre Institute of Climate ChangeUniversiti Kebangsaan MalaysiaSelangor43600Malaysia Department of Computer and Communication Engineering Faculty of Computer Science and EngineeringPatuakhali Science and Technology UniversityPatuakhali8602Bangladesh

This work presents a dual band epsilon negative(ENG)metamaterial with a bilateral coupled split ring resonator(SRR)for use in C and X band wireless communication *** traditional split-ring resonator(SRR)has been amended with this engineered *** proposed metamaterial unit cell is realized on the 1.6 mm thick FR-4 printed media with a dimension of 10×10 *** resonating patch built with a square split outer *** interlinked inner rings are coupled vertically to the outer ring to extend its electrical length as well as to tune the resonance *** simulation is performed using CST studio suite 2019 to design and performance *** transmission coefficient(S21)of the proposed unit cell and array configuration exhibits two resonances at 6.7 and 10.5 GHz with wide bandwidth extended from 4.86 to 8.06 GHz and 10.1 to 11.2 GHz,*** permittivity is noted at frequencies between 6.76–9.5 GHz and 10.5–12 GHz,consecutively,with near-zero refractive index and *** optimal EMR value depicts the compactness of the proposed *** 1×2,2×2 and 4×4 arrays are analyzed that shows similar response compared to the unit *** results of the 2×2 array shows the close similarity of S21 response as compared to *** observed properties of the proposed unit cell ascertain its suitability for wireless communications by enhancing the gain and directivity of the antenna system.

关键词： Metamaterial epsilon negative near-zero index split ring resonator wireless communications

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Application of Parzen Window estimation for incipient fault diagnosis in power transformers

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High Voltage 2018年第4期3卷 303-309页

作者： md Mominul islam Gareth Lee Sujeewa Nilendra Hettiwatte School of Engineering and Information Technology Murdoch UniversityMurdochPerthAustralia School of Engineering National School of Business ManagementHomagamaSri Lanka

Accurate faults diagnosis in power transformers is important for utilities to schedule maintenance and minimises the operation *** gas analysis(DGA)is one of the proven and widely accepted tools for incipient fault diagnosis in power *** improve the accuracy and solve the cases that cannot be classified using Rogers’Ratios,IEC ratios and Duval triangles methods,a novel DGA technique based on Parzen window estimation have been presented in this *** model uses the concentrations of five combustible hydrocarbon gases:methane,ethane,ethylene,acetylene and hydrogen to compute the probability of transformers fault *** of the proposed method has been evaluated against different conventional techniques and artificial intelligence-based approaches such as support vector machines,artificial neural networks,rough sets analysis and extreme learning machines for the same set of transformers.A comparison with other soft computing approaches shows that the proposed method is reliable and effective for incipient fault diagnosis in power transformers.

关键词： artificial diagnosis fault

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Ecological fitness of brown planthopper, Nilaparvata lugens (Stål), to rice nutrient management

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Ecological Processes 2017年第1期6卷 149-158页

作者： md.Mamunur Rashid Mahbuba Jahan Khandakar S.islam md.Abdul Latif Plant Physiology Division Bangladesh Rice Research Institute(BRRI)Gazipur 1701Bangladesh Department of Entomology Bangladesh Agricultural UniversityMymensingh 2202Bangladesh Plant Pathology Division Bangladesh Rice Research Institute(BRRI)Gazipur 1701Bangladesh

Introduction:The brown planthopper(BPH),Nilaparvata lugens(Stål)(Hemiptera:Delphacidae),is a notorious insect pest of *** supplementation can alter plant biochemical compositions which may indirectly affect on ecological fitness parameters of its insect ***,few findings are available on nutrient-induced ecological fitness of BPH and relationship of BPH fitness parameters with its host rice plant biochemical ***:We studied the main and interaction effects of nitrogen(N),phosphorus(P),and potassium(K)inputs on BPH fitness,as measured by the following variables:nymph survival,nymphal duration,adult body weight,and its *** planthopper fitness parameters were regressed as function of rice plant(Oryza sativa)biochemical composition.A completely randomized design with four replications in a factorial scheme was used considering N,P,and K levels as ***:Nitrogen application to the host rice plants provided greater survival and enhanced body weight of *** nymphal duration was found to decrease with N subsidy that caused shorter generation time of *** compounds N and soluble protein(SP),total free sugar(TFS),and silicon(Si)content in rice plant tissue correlated strongly with all fitness traits of ***,SP,and TFS associated positively with BPH survival and body weight,while negatively with nymphal *** contrast,Si had negative correlation with BPH survival and body weight,but positive with nymphal *** supplementation to host plant contributed to increase BPH body *** of P with all parameters of BPH were weak except body weight which was highly significant and *** between N and P inputs demonstrated significant effect on BPH body *** of K had no significant effect on BPH survival and *** analysis did not detect significant relationship of BPH fitness parameters with plant tissue content of ***:The res

关键词： Nilaparvata lugens Nutrient management Survival Nymphal duration Body weight

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A Model of Teaching and Learning Online in Asian Context

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开放教育研究 2005年第6期11卷 63-67页

作者： md Kabirul islam Bangladesh Open University Bangladesh

Online teaching and learning practices in Asian universities are different from that in western universities. Western universities give emphasis on student-student interaction for learning. Online courses offered by most Asian universities are a kind of mixed mode that comprised simultaneous face-to-face tutorials and online interaction facility. In this situation most students use the online facility to collect resources and to contact their teachers. The quantity of student-student interaction was sporadic in many courses. So research is needed to improve the situation and create an environment for students where they can learn what peer group interaction is and practice it. This paper has presented a model of teaching and learning online for Asian universities. Possible barriers in teaching and learning situations in Asia and students' abilities have been considered to develop the model.

关键词：亚洲在线学习开放教育现代远程教育教学模式

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Determining asphalt surface temperature using weather parameters

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第6期6卷 577-588页

作者： Zafrul H.Khan md Rashadul islam Rafiqul A.Tarefder Department of Civil Engineering University of New MexicoAlbuquerqueNM 87131USA Civil Engineering Technology Colorado State University-PuebloPuebloCO 81001USA

Temperature affects the structural response of asphalt concrete(AC) pavement To evaluate the performance,it is important to accurately predict the pavement surface *** study develops three regression models to determine the surface temperature of an asphalt pavement using field measured data such as air temperature,wind speed,wind direction,relative humidity,and solar *** models namely,24-h model,day-time model and night-time model were developed based on one-year continuous *** weather data were measured from October 2012 to October 2013 at an instrumented pavement section on Interstate I-40 near Albuquerque,New *** developed regression models were validated using October 2014 to June 2015 weather data,which were not used in developing the regression *** temperatures predicted using the developed regression models were then compared to those predicted using the pavement mechanistic-empirical(ME) software’s default *** is observed that the regression models are better predictors of pavement surface temperatures than the ME default models.A parametric study was also performed in this study to identify the effects of weather parameters on the pavement surface temperature *** authors of this study expect that this study will be useful in pavement design especially in cold regions.

关键词： Asphalt pavement Air temperature Surface temperature Wind Relative humidity Solar radiation

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