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L-carnitine improves developmental competence of buffalo oocytes in vitro

Asian pacific Journal of Reproduction 2022年第5期11卷 236-242页

作者： Avijit Kumar Modak Md Nuronnabi Islam Asma Khatun Md Hasanur Alam Ireen Akter AKM Ahsan Kabir Md Abul Hashem mohammad moniruzzaman Department of Animal Science Bangladesh Agricultural UniversityMymensingh-2202Bangladesh

Objective:To investigate the effect of L-carnitine on in vitro maturation and subsequent in vitro embryo production of buffalo oocytes.Methods:Cumulus oocyte complexes(COCs)were aspirated from ovaries of slaughtered buffaloes.COCs were classified into good and fair qualities based on morphological observation of numbers and integrity of cumulus cells surrounding the oocyte.Both categories of COCs were placed in in vitro maturation medium with supplementation of different concentrations(0,0.250,0.375 or 0.500 mg/mL)of L-carnitine.Oocytes from both qualities were in vitro fertilized and in vitro cultured for 7 days,to examine the developmental competence.Results:Supplementation of L-carnitine to in vitro maturation medium increased the cumulus cell expansion rate of COCs to grade A,and reduced the cumulus cell expansion of COCs to grade B and grade C in both good and fair quality oocytes.Similarly,L-carnitine induced the in vitro meiotic progression of buffalo oocytes to metaphaseⅡin both good and fair quality oocytes.Additionally,L-carnitine reduced the rate of oocyte degeneration in both good and fair quality oocytes.L-carnitine increased the rate of cleaved formation at day 2 and blastocyst formation at day 7 during in vitro culture in both qualities of oocytes.Moreover,a higher rate of blastocyst production was observed in L-carnitine-treated fair quality oocytes,which was higher than the results in the untreated good quality oocytes.Conclusions:L-carnitine enhances meiotic maturation and subsequent embryo development from both good and fair quality buffalo oocytes.

关键词： Buffalo Cumulus oocyte complex Embryo In vitro maturation In vitro fertilization L-carnitine

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Extraction and characterization of alumina nanopowders from aluminum dross by acid dissolution process

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International Journal of Minerals,Metallurgy and Materials 2015年第4期22卷 429-436页

作者： Saifur Rahman Sarker Zahangir Alam Rakibul Qadir M A Gafur mohammad moniruzzaman Department of Applied Chemistry and Chemical Engineering University of Dhaka Pilot Plant & Project Development Centre (PP& PDC) Bangladesh Council of Scientific and Industrial Research (BCSIR) BCSIR Laboratories Dhaka

A significant amount of aluminum dross is available as a waste in foundry industries in Bangladesh. In this study, alumina was ex- tracted from aluminum dross collected from two foundry industries situated in Dhamrai and Manikgang, near the capital city, Dhaka. Alu- minum dross samples were found to approximately contain 75wt% A1203 and 12wt% SIO2. An acid dissolution process was used to recover the alumina value from the dross. The effects of various parameters, e.g., temperature, acid concentration, and leaching time, on the extrac- tion of alumina were studied to optimize the dissolution process. First, AI（OH）3 was produced in the form of a gel. Calcination of the AI（OH）3 gel at 1000℃, 1200℃, and 1400℃ for 2 h produced O-AlcOa, （t~＋O）-A1203, and u-alumina powder, respectively. Thermal charac- terization of the AI（OH）3 gel was performed by thermogravimetric/differential thermal analysis （TG/DTA） and differential scanning calo- rimetry （DSC）. The phases and crystallite size of the alumina were determined by X-ray diffraction analysis. The dimensions of the alumina were found to be on the nano level. The chemical compositions of the aluminum dross and alumina were determined by X-ray fluorescence （XRF） spectroscopy. The microstructure and morphology of the alumina were studied with scanning electron microscopy. The purity of the alumina extracted in this study was found to be 99.0%. Thus, it is expected that the obtained alumina powders can be potentially utilized as biomaterials.

关键词： aluminum dross alumina nanoparticles acid dissolution calcination X-ray fluorescence analysis

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Interactive effect of dietary vitamin E and inorganic mercury on growth performance and bioaccumulation of mercury in juvenile olive flounder, Paralichthys olivaceus treated with mercuric chloride

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Animal Nutrition 2017年第3期3卷 276-283页

作者： mohammad moniruzzaman Jun-Ho Lee Jin-Hyeok Lee Seonghun Won Jim H.Damusaru Sungchul C.Bai Department of Marine Bio-materials and Aquaculture Feeds & Foods Nutrition Research CenterPukyong National University

A 6-week feeding trial was carried out to evaluate the effects of dietary vitamin E(DL-a-tocopheryl acetate, TA) on growth and mercury(Hg) accumulation in juvenile olive flounder(Paralichthys olivaceus)treated with mercuric chloride(HgCl_2). Vitamin E and HgCl_2 were added to the semi-purified basal diet.Six semi-purified diets in a 2 × 3 factorial design were formulated to contain 2 levels of Hg(0 or 20 mg HgCl_2/kg diet) and 3 levels of vitamin E(0, 100, or 200 mg TA/kg diet). Experimental fish(n = 360,9.99 ± 0.15 g) were randomly allocated into 30-L tanks at a density of 20 fish per tank with 3 replicates in each treatment and were fed twice a day. At the end of the feeding trial, dietary Hg depressed the growth performances in terms of weight gain(WG), specific growth rate(SGR), feed efficiency(FE) and protein efficiency ratio(PER) in fish, while fish fed the diets supplemented with vitamin E showed significant growth improvement in both presence and absence of HgCl_2 in the diets(P < 0.05). Survival rate was not affected in fish fed the experimental diets. Whole body compositions of fish such as lipid and moisture contents were influenced by dietary vitamin E supplementation. Total Hg contents of muscle, liver and kidney tissues were significantly reduced in fish fed diets supplemented with vitamin E(P< 0.05), while the two-way ANOVA showed that increasing Hg concentration has resulted in a reduction in vitamin E.Whole body fatty acids of fish like eicosapentaenoic acid(EPA) and docosahexaenoic acid(DHA) contents were decreased by dietary Hg. However, supplementation of dietary vitamin E improved the a-linolenic acid(ALA) and EPA contents in fish. Our results suggest that dietary supplementation of vitamin E has potential effects on growth improvement and ameliorating inorganic Hg bioaccumulation in juvenile olive flounder.

关键词： Vitamin E Mercury Growth Bioaccumulation Olive flounder

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Foreign Direct Investment, Foreign Trade and Economic Growth:A Study on Bangladesh

Foreign Direct Investment, Foreign Trade and Economic Growth...

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作者： mohammad moniruzzaman 东南大学

学位级别：硕士

研究表明,采用协整方法,从1976到2016年,在年度数据的辅助下,外国直接投资和贸易存在着联系和影响,从而加速了孟加拉国的经济增长。外国直接投资和贸易变量对人均国内生产总值的增长率有相当大的影响。因为在孟加拉国,外国直接投资和贸... 详细信息

研究表明,采用协整方法,从1976到2016年,在年度数据的辅助下,外国直接投资和贸易存在着联系和影响,从而加速了孟加拉国的经济增长。外国直接投资和贸易变量对人均国内生产总值的增长率有相当大的影响。因为在孟加拉国,外国直接投资和贸易是经济增长的两个重要组成部分;它正在减少资本流动的障碍以及促进增长的框架政策。孟加拉国目前的外国直接投资情况仍未达到令人满意的水平。在过去的十年里,外国投资使孟加拉国等资本匮乏的国家能够建立资本,发展工业和转型经济,实现商业自由化,促进宏观经济增长。评估框架的有效性需要改变来促进货币管理,并改善经营状况。此外,应该落实消除官僚作风节以及简化贸易制度的政策。影响孟加拉国直接投资的因素有基础设施薄弱,缺乏技术劳动力以及技术的提升,存在政治不稳定以及官僚主义的弊端。与过去十年相比,近年来,孟加拉国在国际贸易中有了相当大的增长。在适当的补充政策下,贸易可以为生产力增长,充足的就业机会以及增加消费者选择提供稳定的基础。全球经济环境的变化反映了对外直接投资和贸易的国际联系日益扩大和不断升级。孟加拉国的出口贸易主要依靠一些传统商品;其出口商品受到限制。在过去的二十年里,政府和有关部门都在强调成衣,冷冻食品,农产品等。出口可以引领经济增长的初期阶段,之后依赖外国直接投资可能是现实的选择。根据结果显示,贸易贡献促进孟加拉国的经济增长比外国直接投资重要得多。然而,可利用的丰富资源,熟练而廉价的劳动力,稳定的政治环境,有效的货币政策,基础设施的完善以及适当刺激外国投资的战略计划,都有可能创造有利的环境来吸引更多的外国直接投资进入孟加拉国。

关键词：外商直接投资贸易经济增长协整ADF 孟加拉国

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Wordsworth＇s Nature Poetry： An Eco-Scientific Perspective

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Sino-US English Teaching 2012年第12期9卷 1793-1800页

作者： mohammad moniruzzaman Miah Jazan University Jazan KSA

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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 systems.The traditional split-ring resonator(SRR)has been amended with this engineered structure.The proposed metamaterial unit cell is realized on the 1.6 mm thick FR-4 printed media with a dimension of 10×10 mm2.The resonating patch built with a square split outer ring.Two interlinked inner rings are coupled vertically to the outer ring to extend its electrical length as well as to tune the resonance frequency.Numerical simulation is performed using CST studio suite 2019 to design and performance analysis.The 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,respectively.Negative permittivity is noted at frequencies between 6.76–9.5 GHz and 10.5–12 GHz,consecutively,with near-zero refractive index and permeability.The optimal EMR value depicts the compactness of the proposed structure.The 1×2,2×2 and 4×4 arrays are analyzed that shows similar response compared to the unit cell.Measured results of the 2×2 array shows the close similarity of S21 response as compared to simulation.The 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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Effect of Natural Disasters and Their Coping Strategies in the Kuakata Coastal Belt of Patuakhali Bangladesh

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Computational Water, Energy, and Environmental Engineering 2018年第4期7卷 161-182页

作者： mohammad Zahangeer Alam Joan Halsey Md. Manjurul Haque Mimi Talukdar Md. moniruzzaman Alex R. Crump Department of Environmental Science Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh Department of Environmental Science Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur BangladeshBangladesh Washington State University Pullman WA USA Department of Soil and Water Systems University of Idaho Moscow ID USA

Bangladesh has experienced a number of severe natural disasters. Most recently, tropical storms Aila, Sidr and Mohaseen have affected the Kuakata coastal belt. These natural disasters have had substantial negative impacts on natural resources. Development of coping strategies for the protection of natural resources across this belt is significantly important. The present research is focused on the effects of tropical storms on crops, humans, fish, livestock and infrastructure. There were 99 fatalities recorded during the Sidr and Aila natural disasters. These disasters impacted 910.94 ha (Sidr) and 973.69 ha (Aila) of cropland. The total number of affected livestock and fishes such as, 18,200 fish ponds, 1209 cattle, 3324 goats, 6888 chickens, 1716 ducks, 103 buffalo and 144 sheep. After tropical cyclones of Sidr, Aila, Heavy rainstorms and Mohaseen 12,970, 17,703, 10,050 and 2500 households respectively reported some form of damage. Cattle, goat, chicken and buffalo were found more injured than other livestock due to the natural disasters of Sidr. Temperature and wind speed were both found to be statistically significant (p ≤ 0.05) with humidity. Climatic parameters trend has been increased significantly since 1979. Regular monitoring of climatic variables, preparedness activities, and coping strategies would be significantly important for this coastal communities.

关键词： Tropical Storm Natural Disaster Coping Strategies Coastal Belt Preparedness

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