Shahjalal University of Science and Technology
Sylhet, Bangladesh

Shahjalal University of Science and Technology also known as SUST is a state supported not-for-profit research university located in Sylhet, Bangladesh. It is also one of the nine PhD granting research universities of Bangladesh.The university was founded by the Government of Bangladesh according to a university act in 1986 to give special importance in science and technology education. It is the first specialized science & technology university of the country. After SUST, seven more science and technology universities have been established in Bangladesh.SUST is traditionally known for research and education in the physical science and engineering. It is one of the most selective higher learning institutions, and received 40,881 undergraduate applicants for 2012-2013 session—only admitting 1,385, an acceptance rate of 3.39%. Wikipedia.

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Glyoxalase is an evolutionary highly conserved pathway present in all organisms. Conventional glyoxalase pathway has two enzymes, glyoxalase I (GLYI) and glyoxalase II (GLYII) that act sequentially to detoxify a highly cytotoxic compound methylglyoxal (MG) toD-lactate with the help of reduced glutathione. Recently, proteins with DJ-1/PfpI domain have been reported to perform the same conversion in a single step without the help of any cofactor and thus termed as “unique glyoxalase III” enzyme. Genome-wide analysis of glyoxalase genes have been previously conducted in Arabidopsis, rice and Soybean plants, but no such study was performed for one of the agricultural important model legume species, Medicago truncatula. A comprehensive genome-wide analysis of Medicago identified a total of putative 29 GLYI, 14 GLYII genes, and 5 glyoxalase III (DJ-1) genes. All these identified genes and their corresponding proteins were analyzed in detail including their chromosomal distribution, gene duplication, phylogenetic relationship, and the presence of conserved domain(s). Expression of all these genes was analyzed in different tissues as well as under two devastating abiotic stresses- salinity and drought using publicly available transcript data. This study revealed that MtGLYI-4, MtGLYII-6, and MtDJ-1A are the constitutive members with a high level of expression at all 17 analyzed tissues; while MtGLYI-1, MtGLYI-11, MtGLYI-5, MtGLYI-7, and MtGLYII-13 showed tissue-specific expression. Moreover, most of the genes displayed similar pattern of expression in response to both salinity and drought stress, irrespective of stress duration and tissue type. MtGLYI-8, MtGLYI-11, MtGLYI-6, MtGLYI-16, MtGLYI-21, and MtGLYII-9 showed up-regulation, while MtGLYI-17 and MtGLYI-7/9 showed down-regulation in response to both stresses. Interestingly, MtGLYI-14/15 showed completely opposite pattern of expression in these two stresses. This study provides an initial basis about the physiological significance of glyoxalase genes in plant development and stress response of Medicago that could be explored further. © 2017 Ghosh.

Howladar M.F.,Shahjalal University of Science and Technology
Groundwater for Sustainable Development | Year: 2017

This study aims at analyzing the current hydrochemical condition for understanding the factors and processes controlling the chemical composition of surface water with their possible relation to environmental pollution around the Barapukuria Thermal Power Plant (BTPP) impacted area. In this study, the Hill-piper diagram, ratio plots and cross plots were used to recognize the various hydrogeochemical mechanisms involved in the evolution of the water chemistry and quality around the area. The basic statistics, IQR value, correlation matrix, cluster analysis were appealed to implicate the complex interrelationships between the ionic components of water. The principal component (PC) and factor analysis (FA) were computed to detect the possible source of water environmental pollution influenced either by natural or multiple anthropogenic sources like BTPP, existing agriculture activity and so on. The Hill-piper diagram presents two distinct hydrochemical facies such as CaHCO3 and Ca-Mg-Cl facies. The PC/FA revealed that three principal components explained about 63.63% of the total variability. The factor 2 indicated active mixing environmental process like natural and anthropogenic influence. Whereas the high positive loading ions like SiO2, Cr3+, PO3- 4, As3+, Cd2+ and Fe3+ of factors 1 and 3 represent the existence of industrial waste like BTPP while waste water with fly ash has high affinity with such components of water bodies. Thus these results confirmed that discharged from BTPP is the possible source of water environmental pollution for present and future. © 2017 Elsevier B.V.

Hossen A.,Shahjalal University of Science and Technology | Westhues A.,Wilfrid Laurier University
Qualitative Health Research | Year: 2010

This study was an exploration of the experiences of 17 women, age 60 or more years, from Bangladesh. The women were asked about decision-making processes with respect to their access to health care and whether they perceived that there were differences based on age and sex in the way a household responds to an illness episode. The overall theme that characterized their experiences was "being in a socially excluded space." The themes that explained this perception of social exclusion included gender- and age-based social practices, gender- and class-based economic practices, religious beliefs that restricted the mobility of women, and social constructions of health and illness that led the women to avoid seeking health care. We conclude that the Bangladesh constitutional guarantee that disparities will be eliminated in access to health care between rich and poor, men and women, rural and urban residents, and younger and older citizens has not yet been realized. © The Author(s) 2010.

Das S.,University of Malaya | Das S.,Shahjalal University of Science and Technology | Wan Daud W.M.A.,University of Malaya
Renewable and Sustainable Energy Reviews | Year: 2014

Over the past years, a serious contemplation has revealed the need to resolve two major complications: global warming due to rising levels of atmospheric carbon dioxide (CO2) and the alarming consumption of energy resources. Solar fuel production from green CO2 gas would be a convenient solution to resolve both problems simultaneously. Various conventional technologies and their limitations over CO2 transformation into fuels are reviewed in this paper. In the main stream, the review categorizes different types of photocatalysts used in previous photocatalytic conversion of CO2 processes (with detailed information regarding operating conditions, catalysts' preparation techniques, physical properties of catalysts, radiation sources, and selectivity) based on metal oxides, sulfides, phosphides, p-type and non-metal oxide semiconductors. Also, the catalysts modified by doping co-metals, noble metals, transition metals and non-metals for visible light response have been highlighted. Moreover, the recent prospect and advancement of novel sensitized catalysts by dye elements, phthalocyanines and quantum dots (QDs) for harnessing solar fuels are prominent in this outline. Reviews of this topic have also focused on the progression of photocatalytic reactors especially for CO2 photoreduction. Recently, advanced optical fibers and monolith photochemical reactors have become prominent because of their vast photon-harvesting ability. However, this technology needs more implementation with efficient catalyst selection and the development of giant solar reactors for industrial establishment. The current scenario shows that immense prospects and opportunities still exist in this area, but require further investigation and establishment. © 2014 Elsevier Ltd.

Das S.,University of Malaya | Das S.,Shahjalal University of Science and Technology | Wan Daud W.M.A.,University of Malaya
RSC Advances | Year: 2014

The present situation reveals the dependence on fossil fuels, which is seriously accountable for two major impediments: (i) global warming due to increasing atmospheric carbon dioxide (CO2) and (ii) the alarming consumption of energy assets. The reduction of green CO2 in terms of producing solar fuels would be an expedient accomplishment to resolve both problems, simultaneously. The review classifies different categories of photocatalysts applied in foregoing photocatalytic CO2 conversion processes with detailed information concerning operating conditions, preparation techniques and physical properties of catalysts, radiation sources, and selectivity. The categories are concentrated on metal oxides, sulfides, phosphides, and p-type and nonmetal oxide semiconductors. In addition, their modification by doping co-metals, noble metals, transition metals and non-metals for visible light response is emphasized. Besides, for harnessing solar fuel, the recent prospect and advancement of novel sensitized catalysts by dye elements, phthalocyanines and quantum dots (QDs) are also highlighted in this review. This technology needs more efficient solar active catalysts to increase production rates as well as selectivity. The recent scenario indicates that massive prospects and opportunities still exist in this area for further investigation on catalyst selection. This journal is © the Partner Organisations 2014.

Chakrabarty S.,Shahjalal University of Science and Technology | Islam T.,Shahjalal University of Science and Technology
Energy | Year: 2011

To analyze financial viability as well as eco-efficiency of the solar home systems in Bangladesh six case studies are carried out in some selected villages of Chhatak upazila in Bangladesh where NGOs like Grameen Shakti and BRAC are delivering and servicing solar home systems. Financial viability of the SHS is measured by comparing prior expenditure (before implementing SHS) for kerosene, automobile battery and other conventional sources. Eco-efficiency refers to an estimator that seeks to maximize the effectiveness of financial viability while counting their costs on the environment. The financial viability and eco-efficiency for six different cases of SHS are calculated and compared. This provides information about the relative performance of the product in six different situations. Solar electrification results a number of income generating new green employments for the rural community in Bangladesh. Although financial viability of SHS is sensitive to kerosene subsidy, this study reveals that the SHS is financially more attractable when it is used for small income generating activities other than used only for lighting purpose. However, almost in all cases this technology is indispensable for improving environmental standard and eco-efficiency of the rural community. © 2011 Elsevier Ltd.

Haque K.M.M.,Shahjalal University of Science and Technology
Theory of Computing Systems | Year: 2012

The total edge irregularity strength tes(G) and total vertex irregularity strength tvs(G) are invariants analogous to irregular strength s(G) of a graph G for total labellings. Bača et al. (Discrete Math. 307:1378-1388, 2007) determined the bounds and precise values for some families of graphs concerning these parameters. In this paper, we show the exact values of the total edge irregularity strength and total vertex irregularity strength of generalized Petersen graphs P(n,k). © 2011 Springer Science+Business Media, LLC.

Yousuf A.,Shahjalal University of Science and Technology
Waste Management | Year: 2012

Biodiesel can be a potential alternative to petroleum diesel, but its high production cost has impeded its commercialization in most parts of the world. One of the main drivers for the generation and use of biodiesel is energy security, because this fuel can be produced from locally available resources, thereby reducing the dependence on imported oil. Many countries are now trying to produce biodiesel from plant or vegetable oils. However, the consumption of large amounts of vegetable oils for biodiesel production could result in a shortage in edible oils and cause food prices to soar. Alternatively, the use of animal fat, used frying oils, and waste oils from restaurants as feedstock could be a good strategy to reduce the cost. However, these limited resources might not meet the increasing demand for clean, renewable fuels. Therefore, recent research has been focused the use of residual materials as renewable feedstock in order to lower the cost of producing biodiesel. Microbial oils or single cell oils (SCOs), produced by oleaginous microorganisms have been studied as promising alternatives to vegetable or seed oils. Various types of agro-industrial residues have been suggested as prospective nutritional sources for microbial cultures. Since the most abundant residue from agricultural crops is lignocellulosic biomass (LCB), this byproduct has been given top-priority consideration as a source of biomass for producing biodiesel. But the biological transformation of lignocellulosic materials is complicated due to their crystalline structure. So, pretreatment is required before they can be converted into fermentable sugar. This article compares and scrutinizes the extent to which various microbes can accumulate high levels of lipids as functions of the starting materials and the fermentation conditions. Also, the obstacles associated with the use of LCB are described, along with a potentially viable approach for overcoming the obstacles that currently preclude the commercial production of biodiesel from agricultural biomass. © 2012 Elsevier Ltd.

Howladar M.F.,Shahjalal University of Science and Technology
Environmental Earth Sciences | Year: 2013

The present research makes an effort towards awareness of the impact of underground coal mining on water environment around the Barapukuria coal mining area, Dinajpur by direct field investigation, questionnaire survey and laboratory analysis. For this research, the three foremost errands have been mulled over which are the water level data analysis for 10 years from 2001 to 2011, ground water major parametric analysis and the questionnaire survey on the availability of ground water before and after coal mining operation. The results of field and laboratory analysis show that the characteristics and concentrations of all the major physical and chemical parameters such as pH, EC, Temperature, HCO3 -, NO3 -, SO4 2-, Cl-, Na+, K+, Mg2+, Ca2+ and Fe(total) are still tolerable for all purposes and also within the standard limit. On the other hand, the questionnaire survey and water level data analysis confirm almost similar results regarding the depletion of water level. The water level has depleted more than 5 m from 2001 to 2011. Therefore, currently the availability of ground water is normal in the rainy and winter seasons but is slight problematic in the dry season where ground water was available at all times prior to coal mining in the area. From these scenarios, it is comprehensible that the ground water level moves downwards than earlier because of the excess pumping of water from the mine area. Besides the natural recharge condition is not enough and somewhere breaks off while some of the mines out areas are subsided, consequently the upper part of the water bearing formations (aquifer) loses its porous and permeable properties resulting water recharging problem which is directly responsible for depleting the ground water level over the area. Moreover, the water levels will also decline relative to the location, depth, recharge, and discharge conditions of the mine both aerially and vertically while there is a typical relationship between the depth of mining and static water level which is water levels will decline more as the mine goes deeper. Therefore, taking into account the current ground water condition and the depth of Barapukuria coal mine, this research implied that the water level will deplete more in day coming and the water crisis will be more for future. Thus, this research recommends a sustainable guideline for long-term planning and also suggests that regular monitoring with time to time more detail qualitative and quantitative assessments of water bodies in the area. © 2012 Springer-Verlag Berlin Heidelberg.

Redowan M.,Shahjalal University of Science and Technology
Journal of the Indian Society of Remote Sensing | Year: 2013

Biodiversity maps are crucial to conservation management. The present study assesses the accuracy of detecting tree diversity in an Italian forest site by combining mid-resolution images from Landsat-TM or Advanced Land Observation Satellite (ALOS)'s Advanced Visible and Near Infrared Radiometer type 2 (AVNIR-2) sensors with environmental data namely elevation, slope, aspect and solar radiation in an artificial Neural Network (NN) classifier. The map accuracies obtained for Landsat-TM and ALOS images are 60 % and 53 % respectively. Use of environmental data increases accuracies to 91 % and 81 % respectively. Landsat-TM detects tree diversity more accurately than ALOS. Both the coarser pixel size and finer spectral resolution of Landsat-TM contributed to its higher accuracy. © 2013 Indian Society of Remote Sensing.

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