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Khan M.Z.H.,Jessore University of Science and Technology
Surface Engineering and Applied Electrochemistry | Year: 2016

The aim of this review is to discuss the effect of different pretreatments on the physical and chemical properties of Indium Tin Oxide (ITO) thin films, as well as device performance towards sensor applications. The emphasis is on the surface science studies of ITO thin films before and after treatment in order to provide connecting points between surface properties with a broader field of materials science of ITO. The morphology of a monolayer deposited on ITO directly affects the surface properties of prepared ITO films. Thus, it is a topic of interest to study the influence pretreatment on the surface morphology of ITO films on device fabrication and applications as a device platform. © 2016, Allerton Press, Inc.

Zakir Hossain H.M.,Jessore University of Science and Technology | Zakir Hossain H.M.,The University of Shimane | Sampei Y.,The University of Shimane | Roser B.P.,The University of Shimane
Organic Geochemistry | Year: 2013

Distribution and possible sources of polycyclic aromatic hydrocarbons (PAHs) have been investigated in 23 late Eocene to early Pleistocene mudstones from the Sylhet succession of the northeastern Bengal Basin, Bangladesh. Paleoclimatic conditions in the southern Himalaya region throughout the Himalayan uplift were reconstructed, based on combustion derived PAHs and aromatic land plant derived biomarkers. Phenanthrene, fluoranthene (Fla), pyrene (Py), benz[a]anthracene (BaAn), chrysene/triphenylene (Chry+Tpn), benzofluoranthenes (Bflas), benzo[e]pyrene (BePy), benzo[a]pyrene (BaPy), perylene (Pery), indeno[1,2,3-cd]pyrene (InPy), benzo[ghi]perylene (BghiP), coronene (Cor) and retene (Ret) were the identified PAHs. Fla/(Fla+Py) ratios>0.5 and InPy/(InPy+BghiP)>0.2 from almost all Sylhet samples suggest occurrence of natural wildfires. Low contents of BaAn and BaPy indicate decomposition by long exposure to sunlight before sedimentation, or early diagenetic weathering. Increased Cor, InPy and BghiP contents suggest occurrence of larger, high temperature wildfires. Correlation coefficients of the PAHs and p-values for statistical hypothesis testing showed that the positive and negative correlations within the PAHs may be indicative of high or low temperatures in wildfires. Fungi derived Pery showed negative correlations with Py (r=-0.67, p=4.6×10-4) and Fla (r=-0.56, p=5.0×10-3), but not with Cor, Bflas, InPy and BghiP. Based on the correlation coefficients for all PAHs and their p-values, five statistical groups ([Py, Fla], [Cor, Bflas, InPy, BghiP], [BaAn, Chry+Tpn, BaPy], [Pery] and [Ret]) were recognized. These groups are probably correlated with origins and depositional processes. According to the results, the Sylhet succession was deposited in three differing paleoclimatic regimes: (1) First phase (late Eocene to early Miocene, early to middle stage of Himalayan uplift): High contents of combustion derived PAHs (Fla, Py and BePy), significant gymnosperm derived Ret, and low Pery abundances in the Jaintia and Barail groups indicate arid climatic conditions. Although wildfires could often occur, 5- or 6-ring combustion PAHs (Cor, InPy and BghiP) contents are low, suggesting that the wildfires were relatively low temperature. (2) Second phase (middle to late Miocene: middle to late stage of Himalayan uplift): Combustion derived PAHs and fungi derived Pery were dominant in the Surma Group. The climate was arid to humid and seasonal, with a dry season giving conditions suitable for combustion. Abundant Fla, Bflas, BePy, Cor, InPy and BghiP imply high temperatures in large wildfires. However, frequency of the wildfires decreased because of wet climate. (3) Third phase (late Miocene to Pleistocene: late stage of Himalayan uplift): Moderate to high Pery contents and low Fla, Py and BePy abundances in the Tipam and Dupitila groups indicate establishment of more humid climate. InPy, BghiP, Cor, Bflas and BaPy were predominant. Intensified humid and seasonal climate arising from the Himalayan monsoon decreased the incidence and frequency of general wildfires, but increased the ratio of large to small wildfires. © 2012 Elsevier Ltd.

Zakir Hossain H.M.,Jessore University of Science and Technology | Hasna Hossain Q.,The University of Shimane | Uddin Monir M.M.,Jessore University of Science and Technology | Ahmed M.T.,Jessore University of Science and Technology
Renewable and Sustainable Energy Reviews | Year: 2014

With radically increased population, rapid economic growth and expansion of urbanization and industrialization, mega-cities of Bangladesh are faces the complexity of municipal solid waste (MSW) management. The purpose of this paper is to review the types of MSW that are currently being used for renewable energy sources. To meet up the power supply for city dwellers and reducing space for new landfills, waste-to-energy (WTE) incineration is playing a vital role for renewable energy production from discarded MSW. Incineration of MSW is complex owing to its low calorific value (~3000 kJ/kg) and high water content (~60%). MSW in Bangladesh contains relatively high proportion of organic matter (74.6%) than paper (9.1%) and plastic (3.5%). Using landfill gas recovery process, generation of electricity from MSW in six mega-cities is ~186,408 kW h/day. Therefore, WTE incineration system contributes greater supply of renewable energy in Bangladesh. © 2014 Elsevier Ltd.

Humayan Kabir A.,University of Rajshahi | Swaraz A.M.,Jessore University of Science and Technology | Stangoulis J.,Flinders University
Journal of Plant Nutrition and Soil Science | Year: 2014

Zinc (Zn) deficiency is a well-documented problem in plants, causing decreased yields and nutritional quality. When facing a shortage in Zn supply, plants acclimatize by enhancing the Zn acquisition. In this review, we highlight recent progress in understanding of plant resistance to Zn deficiency and discuss the future challenges to fully unravel its molecular basis of regulation. Emphasis is given on the physiological and molecular basis of Zn acquisition, the long-distance transport of Zn and the genotypic variations in Zn use efficiency of plants. Prospects of Zn biofortification strategies as well as further efforts for crop improvement to overcome Zn deficiency are also addressed. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Jahid I.K.,Chung - Ang University | Jahid I.K.,Jessore University of Science and Technology | Lee N.-Y.,Chung - Ang University | Kim A.,Chung - Ang University | Ha S.-D.,Chung - Ang University
Journal of Food Protection | Year: 2013

Aeromonas hydrophila recently has received increased attention because it is opportunistic and a primary human pathogen. A. hydrophila biofilm formation and its control are a major concern for food safety because biofilms are related to virulence. Therefore, we investigated biofilm formation, motility inhibition, quorum sensing, and exoprotease production of this opportunistic pathogen in response to various glucose concentrations from 0.05 to 2.5% (wt/vol). More than 0.05% glucose significantly impaired (P < 0.05) quorum sensing, biofilm formation, protease production, and swarming and swimming motility, whereas bacteria treated with 0.05% glucose had activity similar to that of the control (0% glucose). A stage shift biofilm assay revealed that the addition of glucose (2.5%) inhibited initial biofilm formation but not later stages. However, addition of quorum sensing molecules N-3-butanoyl-DL-homoserine lactone and N-3-hexanoyl homoserine lactone partially restored protease production, indicating that quorum sensing is controlled by glucose concentrations. Thus, glucose present in food or added as a preservative could regulate acyl-homoserine lactone quorum sensing molecules, which mediate biofilm formation and virulence in A. hydrophila. Copyright ©, International Association for Food Protection.

Jahid I.K.,Chung - Ang University | Jahid I.K.,Jessore University of Science and Technology | Ha S.-D.,Chung - Ang University
Foodborne Pathogens and Disease | Year: 2014

The present article focuses on the inactivation kinetics of various disinfectants including ethanol, sodium hypochlorite, hydrogen peroxide, peracetic acid, and benzalkonium chloride against Aeromonas hydrophila biofilms and planktonic cells. Efficacy was determined by viable plate count and compared using a modified Weibull model. The removal of the biofilms matrix was determined by the crystal violet assay and was confirmed by field-emission scanning electron microscope. The results revealed that all the experimental data and calculated Weibull α (scale) and β (shape) parameters had a good fit, as the R2 values were between 0.88 and 0.99. Biofilms are more resistant to disinfectants than planktonic cells. Ethanol (70%) was the most effective in killing cells in the biofilms and significantly reduced (p<0.05) the biofilms matrix. The Weibull parameter b-value correlated (R2=0.6835) with the biofilms matrix removal. The present findings deduce that the Weibull model is suitable to determine biofilms matrix reduction as well as the effectiveness of chemical disinfectants on biofilms. The study showed that the Weibull model could successfully be used on food and food contact surfaces to determine the exact contact time for killing biofilms-forming foodborne pathogens. © 2014 Mary Ann Liebert, Inc.

Jahid I.K.,Chung - Ang University | Jahid I.K.,Jessore University of Science and Technology | Han N.,Chung - Ang University | Ha S.-D.,Chung - Ang University
Food Research International | Year: 2014

Disease outbreaks from fresh produce have been increasing as a result of the increasing global consumption of produce. We evaluated the efficiency of cold oxygen plasma (COP), a new technology for the decontamination of fresh produce, in reducing biofilm of Aeromonas hydrophila, an emerging food-borne pathogen on lettuce. Lettuce leaves were inoculated with A. hydrophila at different temperatures to form biofilm and planktonic populations, and the inactivation kinetics of COP were determined using a modified Weibull model. To elucidate the antimicrobial mechanism of COP, we used field emission scanning electron microscopy (FESEM) and a quorum sensing (QS) assay. We found that 5. min of treatment with COP significantly (p<. 0.05) reduced the biofilm populations of A. hydrophila on lettuce by 5.0-log incubation at lower than 15. °C, whereas biofilm populations displayed enhanced resistance to COP treatment at higher temperatures (≥. 15. °C). Planktonic populations also decreased by >. 5.0-log within 15. s treatment of COP by incubating at any temperature. The mean Td-values for a 5-log reduction (analogous to the traditional D-value) ranged from 4.4-8.1. s and 1.84-25.33. min for the planktonic and biofilm populations, respectively. However, higher temperatures (≥. 15. °C) resulted in a significantly higher QS (p<. 0.05) as well as biofilm formation and internalization in stomata, suggesting that higher biofilm formation and internalization might be the main factors mediating resistance to COP. In summary, this study highlights the impact of temperature on the modulation of QS, biofilm formation, internalization, and COP resistance in lettuce. © 2013.

Rahman S.,Jessore University of Science and Technology | Parvin R.,Chittagong Veterinary and Animal Sciences University
Asian Pacific Journal of Tropical Disease | Year: 2014

Medicinal plants are used in herbalism. They form the easily available source for healthcare purposes in rural and tribal areas. In the present review, an attempt has been made to congregate the phytochemical and pharmacological studies done on an important medicinal plant Aegle marmelos. Extensive experimental and clinical studies prove that Aegle marmelos possesses antidiarrhoeal, antimicrobial, antiviral, radioprotective, anticancer, chemopreventive, antipyretic, ulcer healing, antigenotoxic, diuretic, antifertility and anti-inflammatory properties, which help it to play role in prevention and treatment of many disease. Therefore, it is worthwhile to review its therapeutic properties to give an overview of its status to scientist both modern and ancient. This review also encompasses on the potential application of the above plant in the pharmaceutical field due to its wide pharmacological activities. © 2014 Asian Pacific Tropical Medicine Press.

Halder P.K.,Jessore University of Science and Technology | Paul N.,Bangladesh University of Engineering and Technology | Beg M.R.A.,Rajshahi University of Engineering and Technology
Renewable and Sustainable Energy Reviews | Year: 2014

Bangladesh is energy starve country facing a severe power crisis for the last few decades because of inadequate power generation capacity compared with demand. The power generation of the country largely depends on the non-renewable (fossil fuel) energy sources, mainly on the natural gas as accounts 64.5% of recent installed capacity. This trend causes rapid depletion of non-renewable energy sources. Thus, it is necessary to trim down the dependency on non-renewable energy sources and utilize the available renewable resources to meet the huge energy demand facing the country. Most of the people living in rural, remote, coastal and isolated areas in Bangladesh have no electricity access yet. However, renewable energy resources, especially biomass can play a pivotal role to electrify those rural, remote, coastal and isolated areas in the country. Humankind has been using biomass as an energy source for thousands of years. This study assesses the bio-energy potential, utilization and related Renewable Energy Technologies (RETs) practice in Bangladesh. Improved cooking stove, biogas plant and biomass briquetting are the major RETs commonly practiced in Bangladesh. The assessment includes the potential of agricultural residue, forest residue, animal manure and municipal solid waste. The estimated total amount of biomass resource available for energy in Bangladesh in 2012-2013 is 90.21 million tons with the annual energy potential of 45.91 million tons of coal equivalent. The recoverable amount of biomass (90.21 million tons) in 2012-2013 has an energy potential of 1344.99 PJ which is equivalent to 373.71 TWh of electricity. © 2014 Elsevier Ltd.

Halder P.K.,Jessore University of Science and Technology
Renewable and Sustainable Energy Reviews | Year: 2016

Solar home systems (SHSs) are the real hope for electrification of the off-grid areas in Bangladesh by utilizing the solar energy in renewable and sustainable basis. This paper demonstrates the solar energy prospect, the present status and dissemination schemes of SHSs in off-grid and coastal areas of Bangladesh by several government and Non-government organizations (NGOs). The country has an average daily solar radiation ranges between 4–6.5 kWh/m2. Currently, more than 3.8 million SHSs of capacity range 10–135 Wp (watt peak) with a total capacity of 150 MW have been disseminated in rural and isolated areas in Bangladesh. In this paper, ten case studies of capacity 20 Wp, 30 Wp and 42 Wp were investigated to evaluate economic viability at two randomly selected villages in Sirajgonj district and Jessore district, Bangladesh. The analysis showed that the SHSs for small business enterprise and household with small income generation are economically viable rather than only household lighting. © 2016 Elsevier Ltd

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