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Forensic Medicine and Anatomy Research 2014年第4期2卷 95-100页

作者： Gazi Nurun Nahar Sultana Jannatul Ferdoush Tuli rokeya begum Rakesh Tamang Centre for Advanced Research in Sciences University of Dhaka Dhaka Bangladesh Department of Genetic Engineering and Biotechnology University of Dhaka Dhaka Bangladesh University of Kolkata Kolkata India

Mitochondrial DNA sequences of the entire control region and three coding regions were analyzed in 108 unrelated individuals from three regions of Bangladesh. Sequence evaluation was performed with validated primers and combined sequence comparison led to the identification of 14 different haplotypes characterized by 37 variable polymorphic sites. The Bangladeshi sequences exhibited high variations and low random match probability, indicating for forensic application. The mean pairwise difference between individual was 9.698 ± 1.8658 nucleotides (95% CI 9.67 - 9.69), compared to a mean pairwise difference of 9.890 ± 4.189 nucleotides reported from Northeast Asia and suggested significant differences in the mtDNA composition of the various populations. The sequence diversity of 108 Bangladeshi Bengali samples (n = 216 chromosomes) was estimated to be 0.8475 ± 0.13406. This study first time reports that the comparison of closely related mtDNA sequences can be very useful for improving mtDNA database quality, as well as provide haplotype information for forensic study in mainstream population of Bangladesh.

关键词： Forensic Database Mainstream Population mtDNA Control Region Coding Region Haplotype Bangladesh

Emblica officinalis improves glycemic status and oxidative stress in STZ induced type 2 diabetic model rats

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Asian Pacific Journal of Tropical Medicine 2014年第1期7卷 21-25页

作者： Aneesa Ansari Md.Shahed Zaman Shahriar Md.Mehedi Hassan Shukla Rani Das begum rokeya Md.Anwarul Haque Md.Enamul Haque Nirupam Biswas Tama Sarkar Department of Genetic Engineering and Biolechnology Jessore Science and Technology UniversityJessoreBangladesh Department of Biotechnology and Genetic Engineering Islamic UniversityKushtiaBangladesh Department of Biomedical Science Chonbuk National University Medical SchoolJeonju 561-712South Korea Department of Biochemistry and Molecular Biology Hajee Mohammad Danesh Science & Technology UniversityDinajpurBangladesh Department of Biochemistry and Cell Biology Bangladesh Institute of Research and Rehabilitation in DiabetesEndocrine and Metabolic Disorders (BIRDEM)DhakaBangladesh Department of Biochemistry and Molecular Biology University of DhakaDhaka-1000Bangladesh Department of Nutrition and Food Sciences University of HuddersfieldHuddersfiledHD1 3DHUnited Kingdom Department of Applied Nutrition and Food Technology Islamic UniversityKushtiaBangladesh

Objective:To evaluate the antidiabetic and antioxidant potential of Emblica officinalis(***)fruit on normal and type 2 diabetic ***:Type 2 diabetes was induced into the male Long-Evans *** rats were divided into nine groups including control groups receiving water,type 2 diabetic controls,type 2 diabetic rats treated with glibenclamide(T2GT)and type 2diabetic rats treated with aqueous extract of fruit pulp of *** were fed orally for8 weeks with a single *** was collected by cutting the tail tip on 0 and 28 days and by decapitation on 56 *** red blood cells and serum were used for evaluating different biochemical ***:Four weeks administration of aqueous extract of *** improved oral glucose tolerance in type 2 rats and after 8 weeks it caused significant(P<0.007)reduction in fasting serum glucose level compared to 0 *** decreased by 14%but there was no significant change in serum ALT,creatinine,cholesterol and insulin level in any ***,reduced erythrocyte malondialdehyde level showed no significant change(P<0.07)but reduced glutathione content was found to be increased significantly(P<0.05).Conclusions:The aqueous extract of *** has a promising antidiabetic and antioxidant properties and may be considered for further clinical studies in drug development.

关键词： Antioxidant Emblica officinalis Non-insulin dependent diabetes mellitus Type 2 diabetic rats Reduced glutathione

The antihyperglycemic effect of Bridelia ndellensis ethanol extract and its fractions is mediated by an insulinotropic action

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Journal of Diabetes Mellitus 2013年第3期3卷 111-115页

作者： Selestin Dongmo Sokeng begum rokeya Jamadder Mohammed Abdul Hannan Liaquat Ali Pierre Kamtchouing Department of Biological Sciences University of Ngaoundéré Ngaoundéré Cameroon Department of Pharmacy North South University Dhaka Bangladesh Laboratory of Animal Physiology Faculty of Science University of Yaounde Yaounde Cameroon Research Division Bangladesh Institute of Research and Rehabilitation in Diabetes Endocrine and Metabolic Disorders (BIRDEM) Dhaka Bangladesh

Backgroung: Bridelia ndellensis (Euphorbiaceae) is used as a traditional plant treatment of diabetes. The aim of the present study was to investigate the mechanism involved in the antihyperglycemic effects of this plant. Methods: An intestinal perfusion technique was used to study the effect of the ethanol extract of B. ndellensis on the intestinal absorption of glucose in normal rats fasted for 36 h. The effect of the extract (50 and 100 mg/kg) on Insulin secretion was evaluated using BRIN-BD11 pancreatic cells. Results: In a perfused rat intestinal preparation in situ, the plant extract at a concentration of 5 mg/ml did not show any inhibitory effects on glucose absorption when compared with control animals. Ouabain which is an inhibitor of glucose transport across the small intestine significantly (p < 0.001) decreased the glucose absorption during the whole perfusion period compared with the control group. On the other hand, the plant extract inhibited the gastrointestinal motility induced by Barium sulphate milk in rats. The ethanol extract of B. ndellensis at concentrations of 50 and100mg/ml stimulated in a concentration-dependent manner the insulin secretion from BRIN-BD11 cells in vitro. The induction of insulin release was significantly different when compared to control with the concentration of 100 μg/ml (P < 0.001). Alanine (10 mM) used as positive control, significantly (p < 0.001) stimulated insulin release from BRIN-BD11 cells. Conclusion: The present study has revealed that B. ndellensis ethanol extract stimulates insulin secretion and does not affect the glucose absorption, and it has suggested that the antihyperglycemic effects of B. ndellensis is partly mediated by the stimulation of insulin secretion.

关键词： Bridelia ndellensis Ethanol Extract Intestinal Glucose Absorption Insulin Secretion in Vitro

A New Compression Scheme for Secure Transmission

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International Journal of Automation and computing 2013年第6期10卷 578-586页

作者： M.Baritha begum Y.Venkataramani Saranathan College of Engineering

Encryption techniques ensure security of data during transmission. However, in most cases, this increases the length of the data, thus it increases the cost. When it is desired to transmit data over an insecure and bandwidth-constrained channel, it is customary to compress the data first and then encrypt it. In this paper, a novel algorithm, the new compression with encryption and compression （CEC）, is proposed to secure and compress the data. This algorithm compresses the data to reduce its length. The compressed data is encrypted and then further compressed using a new encryption algorithm without compromising the compression efficiency and the information security. This CEC algorithm provides a higher compression ratio and enhanced data security. The CEC provides more confidentiality and authentication between two communication systems.

关键词： Data compression encryption algorithm compression with encryption and compression (CEC) algorithm Huffmancoding run length coding bits per character (BPC).

A Brief Study on the Ignition of the Non-Thermal Atmospheric Pressure Plasma Jet from a Double Dielectric Barrier Configured Plasma Pencil

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Plasma Science and Technology 2013年第7期15卷 627-634页

作者： Asma begum Mounir LAROUSSI M. R. PERVEZ School of Engineering and Computer Science Independent UniversityDhaka Bangladesh Department of Electrical and Computer Engineering Old Dominion UniversityUSA Department of Physics Master Mind CollegeDhaka Bangladesh

To understand the self sustained propagation of the plasma jet/bullet in air under atmospheric pressure, the ignition of the plasma jet/bullet, the plasma jet/bullet ignition point in the plasma pencil, the formation time and the formation criteria from a dielectric barrier configured plasma pencil were investigated in this study. The results were confirmed by comparing these results with the plasma jet ignition process in the plasma pencil without a dielectric barrier. Electrical, optical, and imaging techniques were used to study the formation of the plasma jet from the ignition of discharge in a double dielectric barrier configured plasma pencil. The investigation results show that the plasma jet forms at the outlet of the plasma pencil as a donut shaped discharge front because of the electric field line along the outlet＇s surface. It is shown that the required time for the formation of the plasma jet changes with the input voltage of the discharge. The input power calculation for the gap discharge and for the whole system shows that 56% of the average input power is used by the first gap discharge. The estimated electron density inside the gap discharge is in the order of 1011 cm^-3. If helium is used as a feeding gas, a minimum 1.48× 10^-8 C charge is required per pulse in the gap discharge to generate a plasma jet.

关键词： plasma jet/bullet bullet formation dielectric barrier discharge non-thermalatmospheric pressure plasma

Acoustofluidic localization of sparse particles on a piezoelectric resonant sensor for nanogram-scale mass measurements

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Microsystems & Nanoengineering 2021年第4期7卷 117-125页

作者： Jingui Qian Habiba begum Joshua E.-Y.Lee Department of Electrical Engineering City University of Hong KongKowloonHong Kong SARChina State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong SARChina

The ability to weigh microsubstances present in low concentrations is an important tool for environmental monitoring and chemical *** instance,developing a rapid analysis platform that identifies the material type of microplastics in seawater would help evaluate the potential toxicity to marine *** this study,we demonstrate the integration of two different techniques that bring together the functions of sparse particle localization and miniaturized mass sensing on a microelectromechanical system(MEMS)chip for enhanced detection and minimization of negative *** droplet sample for analysis is loaded onto the MEMS chip containing a resonant mass *** the coupling of a surface acoustic wave(SAW)from a SAW transducer into the chip,the initially dispersed microparticles in the droplet are localized over the detection area of the MEMS sensor,which is only 200 pm *** accreted mass of the particles is then calibrated against the resulting shift in resonant frequency of the *** SAW device and MEMS chip are detachable after use,allowing the reuse of the SAW device part of the setup instead of the disposal of both *** platform maintains the strengths of noncontact and label-free dual-chip acoustofluidic devices,demonstrating for the first time an integrated microparticle manipulation and real-time mass measurement platform useful for the analysis of sparse microsubstances.

关键词： resonant sparse mass

Examining techno-economic interactions among fish species:A case of small-scale demersal fishery

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Aquaculture and Fisheries 2024年第4期9卷 682-695页

作者： Jaynab begum Yousuf Shekar Bose Humanities Research Centre Sultan Qaboos UniversityP.O Box 34Muscat123Oman Sultan Qaboos University Al KhoudMuscat123Oman Queen Street Brisbane CityQueensland4000Australia

Using the multi-product dual revenue function framework,this paper examines the nature and extent of technical and economic interactions among five demersal species of Al-Batinah demersal fishery,Oman during the 2010-2016 *** parameters of the system of output supply functions are estimated using Zellner’s seemingly unrelated regressions(SUR)*** likelihood ratio test in relation to the structure of the multi-output production technology rejects the null-hypothesis of input-output separability and non-jointness in *** results suggest that the underlying production technology is non-separable between the outputs and the quasi-fixed input,and the harvesting level of one species is likely to have spill-over economic effects on the harvesting levels of *** own-price elasticities of output supply are found to be positive,inelastic,and statistically significant in four out of five cases suggesting that,other things being equal,fishers’supply decisions are influenced by the prevailing market prices of *** estimated values of the cross-price elasticity of supply are negative,inelastic and statistically significant at the 5%level for eight output *** calculated values of the Morishima elasticity of substitution(MES)indicate the presence of substitutability between ten output *** cross-price elasticity estimates are in the range of􀀀0.001(between Emperor and Catfish)to􀀀0.275(between Seabream and Grouper)which is lower(in absolute value)than that of the MES *** magnitudes of the cross-price elasticity and the MES estimates indicate the extent of spill-over effects of one species on the other and signal the extent of species targeting by fishers.A statistically significant spatial,seasonal,and inter-annual variability is observed in all species ***,the implications of the findings are discussed from the perspective of developing effective management approaches,achieving sustainability of fisheries resource

关键词： Multi-product technology Separability Non-jointness Supply responses Targeting Small-scale fisheries Oman

On numerical modeling of low-head direct chill ingot caster for magnesium alloy AZ31

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Journal of Magnesium and Alloys 2014年第4期2卷 275-286页

作者： Mainul Hasan Latifa begum Department of Mining&Materials Engineering McGill UniversityM.H.Wong Building3610 University StreetMontrealQC H3A 0C5Canada

A comprehensive 3D turbulent CFD study has been carried out to simulate a Low-Head(LH)vertical Direct Chill(DC)rolling ingot caster for the common magnesium alloy *** model used in this study takes into account the coupled laminar/turbulent melt flow and solidification aspects of the process and is based on the control-volume finite-difference *** the aluminum/magnesium DC casting industrial practices,the LH mold is taken as 30 mm with a hot top of 60 *** previously verified in-house code has been modified to model the present casting *** quantitative results are obtained for four casting speeds,for three inlet melt pouring temperatures(superheats)and for three metal-mold contact heat transfer coefficients for the steady state operational phase of the *** variable cooling water temperatures reported by the industry are considered for the primary and secondary cooling zones during the ***,the temperature and velocity fields,sump depth and sump profiles,mushy region thickness,solid shell thickness at the exit of the mold and axial temperature profiles at the center and at three strategic locations at the surface of the slab are presented and discussed.

关键词： Low-head DC caster Magnesium alloy AZ31 3D CFD modeling Turbulent melt flow Solidification Mushy region thickness Sump profile

Semi-continuous casting of magnesium alloy AZ91 using a filtered melt delivery system

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Journal of Magnesium and Alloys 2015年第4期3卷 283-301页

作者： Mainul Hasan Latifa begum Department of Mining&Materials Engineering McGill UniversityM.H.Wong Building3610 University StreetMontrealQC H3A 0C5Canada

A 3-D numerical simulation of an industrial-sized slab caster for magnesium alloy AZ91 has been carried out for the steady state operational phase of the *** simulated model consists of an open-top melt delivery system fitted with a porous filter near the *** melt flow through the porous filter was modeled on the basis of Brinkmann-Forchimier-Extended non-Darcy model for turbulent *** in-house 3-D CFD code was modified to account for the melt flow through the porous *** are obtained for four casting speeds namely,40,60,80,and 100 mm/*** metal-mold contact region as well as the convective heat transfer coefficient at the mold wall were also *** addition to the above,the Darcy number for the porous media was also *** parametric studies were performed for a fixed inlet melt superheat of 64℃.The results are presented pictorially in the form of temperature and velocity *** sump depth,mushy region thickness,solid shell thickness at the exit of the mold and axial temperature profiles are also presented and correlated with the casting speed through regression analysis.©2015 Production and hosting by Elsevier *** behalf of Chongqing University.

关键词： Magnesium alloy AZ91 VDC casting Slab caster 3D CFD modeling Porous filter Non-Darcy model Turbulent melt flow Solidification Mushy region

Engineering of responsive polymer based nano-reactors for facile mass transport and enhanced catalytic degradation of 4-nitrophenol

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Journal of Environmental Sciences 2018年第10期30卷 43-52页

作者： Robina begum Zahoor HFarooqi Zonarah Butt Qingshi Wu Weitai Wu Ahmad Irfan Centre for Undergraduate studies University of the Punjab New Campus Institute of Chemistry University of the Punjab New Campus State Key Laboratory for Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical EngineeringXiamen University Department of Chemistry Faculty of Science King Khalid University Research Center for Advanced Materials Science King Khalid University

Silver nanoparticles with average diameter of 10 ± 3 nm were synthesized within the sieves of poly（N-isopropylacrylamide-2-hydroxyethylmethacrylate-acrylic acid）（p（NIPAAm-HEMA-AAc））polymer microgels. Free radial emulsion polymerization was employed for synthesis of p（NIPAAm-HEMA-AAc） polymer microgels. Silver nanoparticles were introduced within the microgels sphere by in situ reduction method. Microgels and hybrid microgels were characterized by Fourier transform infrared spectroscopy, ultra violet-visible spectroscopy,transmission electron microscopy and dynamic light scattering measurements. Catalytic activity of Ag-p（NIPAAm-HEMA-AAc） hybrid microgels was studied using catalytic reduction of 4-nitrophenol（4-NP） as a model reaction in aqueous media. The influence of sodium borohydride（Na BH4） concentration, catalyst dose and 4-NP concentration on catalytic reduction of 4-NP was investigated. A linear relationship was found between catalyst dose and apparent rate constant（kapp）. The mechanism of catalysis by hybrid microgels was explored for further development in this area. The deep analysis of catalytic process reveals that the unique combination of NIPAAm, HEMA and AAc does not only stabilize silver nanoparticles in polymer network but it also enhances the mass transport of hydrophilic substrate like 4-NP from outside to inside the polymer network.

关键词： Polymer microgels Metal nanoparticles Hybrid microgels Catalytic degradation