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Md. Rafiqul Islam,Jeong-Eui Hong,Hoy-Taek Kim,Jong-In Park,Ill-Sup Nou 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
Acidovorax citrulli (A. citrulli) strain causes bacterial fruit blotch (BFB) in cucurbit crops and watermelon, is an economically devastating disease in watermelon. Molecular characterization of causal strains and identification of sources of resistance are essential to control this important disease. BFB were identified by partial sequencing and documented in GenBank. Recently, there was an outbreak of BFB strain NIHHS16-088 in watermelon fields (North Jeolla Province, South Korea) that severely hampered watermelon production in Korea. Therefore, we characterized NIHHS16-088 by partially sequencing the 16S rRNA gene using PCR-based markers. The partial sequence of the 16S rRNA gene of NIHHS16-088 was much more similar to A. citrulli strains allied with watermelon and melon hosts than other cucurbit hosts. A PCR-based assay identified the strain (NIHHS16-088) as belonging to A. citrulli group II, which mostly infects watermelon cucurbits (virulent to watermelon). Seventy watermelon accessions were screened against NIHHS16-088 in a detached-leaf inoculation assay. The lack of visible disease symptoms 12 days after inoculation in lines SNKW41 and SNKW85 indicated these to be highly resistant, whereas moderate resistance was observed in SNKW60, SNKW61, SNKW103 and SNKW104. The characterized A. citrulli strain NIHHS16-088 (group II) and identified resistant lines will assist as a precious resource for further genetic studies and development of BFB resistance in watermelon.
Strain Dependent Performance Analysis of InGaN Multi-junction Solar Cell
Md. Aminur Rahman,Md. Jahirul Islam,Md. Rafiqul Islam,M. A. Parvez Mahmud 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.6
This study reports the strain-dependent efficiency of the InGaN-based multi-junction solar cell (MJSC) for the first time. The route of strain in MJSC is identifi ed to be the results of dissimilar lattice constants between layers of sub-cell grown epitaxially with bandgap stepping. Utilising multi-layered strain model, the state of strain and its magnitude is evaluated for three types of MJSC structures referred to as MJSC-1, MJSC-2, and MJSC-3. It is found that the MJSC position-dependent strain is strongly dependent on the sub-cell thickness as well as on the number of sub-cells. Employing the MJSC position-dependent strain in combination with deformation potentials, strain-induced energy bandgap is calculated when imposed under tensile strain condition. Finally, the strain-dependent efficiencies of different MJSC structures are estimated and obtained to be lower with that of reported with strain effects over sighted. The loss of efficiency is identifi ed to be due to the open circuit voltage which decreases under tensile strain condition. Among the MJSC structures studied here, MJSC-3 with 7-layers is less efficient and its efficiency decreases up to 3.01% when strain effect is taken into consideration.
Md Mahbubur Rahman,Mohammad Saiful Islam,Adam G.O,Md. Rafiqul Alam,유명조 한국임상수의학회 2014 한국임상수의학회지 Vol.31 No.3
Acidosis conditions either acute or chronic following ingestion of excessive amounts of readily fermentedcarbohydrate are great production problems for goat in Bangladesh. This study designed to investigate the prevalenceof lactic acidosis and then response to different therapeutic agents. For this purpose, 1,128 goat were examined atoutdoor District Veterinary Hospital, Faridpur, Bangladseh for treatment of which 40 goats were found positive forlactic acidosis showing 3.55% prevalence of disease. The highest occurrence found in female (4.64%) of over 3 yearsage (4.64%) in indigenous goat (2.7%). For therapeutic assessment the forty affected goats were divided into fourgroups A, B, C and D comprising of 10 animals each. Group A were given magnesium hydroxide 8% w/v at 1 g/kg body weight orally. In group B magnesium hydroxide 8% w/v at a dose as group A combination with 7.5% sodiumbicarbonate at the rate of 0.9 ml/Kg body weight intravenously administered. Goat in group D were treated with mixtureof ginger, nuxvomica, sodium carbonate, cobalt sulphate, dried ferrous sulphate and thiamin mononitrate at the rateof 1 g/kg body weight orally. Goat of group C treated with combination drugs of group A, B and D. The rectaltemperature, pulse rate, respiration rate, was performed before and after treatment. It was found that the highest recoveryin group C with an average period of 21 ± 1.8 hours. It was concluded that lactic acidosis is a common disease ofgoats and its severity can be effectively reduced by using combination drugs.
Islam, Md Rafiqul,Bach, Long Giang,Vo, Thanh-Sang,Lee, Doh C,Lim, Kwon Taek American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.8
<P>A facile synthetic route has been developed for the covalent grafting of biocompatible poly(lactic acid) (PLA) onto CdSe Quantum Dots (QDs) using surface initiated ring opening polymerization (ROP) to afford CdSe-g-PLA nanocomposites. At first, 2-mercaptoethanol (ME) capped CdSe QDs were synthesized through a wet chemical process. The surface initiated ROP of lactide was accomplished with Sn(Oct)2 to give CdSe-g-PLA nanocomposites having surface hydroxyl functionality. FT-IR data suggested that a robust covalent bond was formed between ME capped CdSe QDs and polymer moieties. The grafting density of PLA on CdSe QDs was found to be moderate as measured by TGA analysis. The CdSe QDs were well dispersed in CdSe-g-PLA nanocomposites matrices as captured by TEM. The cubic phase crystal structure of CdSe QDs in the nanocomposites was determined by XRD. The optical properties of the CdSe-g-PLA nanocomposites were investigated by UV-vis and photoluminescence spectroscopy which suggested their potentialities as optical materials in biomedical application. Cell viability studies revealed that the biocompatibility of CdSe QDs was improved upon PLA immobilization.</P>
Islam, Md Rafiqul,Bach, Long Giang,Vo, Thanh-Sang,Lim, Kwon Taek American Scientific Publishers 2015 Journal of nanoscience and nanotechnology Vol.15 No.1
<P>A simple protocol for covalent immobilization of biotin onto the surface of Fe3O4 magnetic nanoparticles (MNPs) for improving the biocompatibility of original MNPs has been realized. MNPs were first prepared by co-precipitation method which was subsequently anchored with functionalized biotin. The as-synthesized MNPs were observed to be monocrystalline as evidenced from XRD and TEM images. The covalent grafting of biotin to MNPs was confirmed by FT-IR. The XPS analysis suggested the successful preparation of Biotin-f-MNPs. The as-synthesized Biotin-f-MNPs were found to be superparamagnetic character as recorded by SQUID. Cell viability studies revealed that the biocompatibility of MNPs was improved upon Biotin immobilization.</P>
Islam, Md Rafiqul,Bach, Long Giang,Jeong, Jung Hyun,Kim, Hyun Gyu,Lim, Kwon Taek American Scientific Publishers 2013 Journal of nanoscience and nanotechnology Vol.13 No.5
<P>A nanocomposite of TiO2 nanoparticle with an electroactive poly(4-vinylpyridine) (PVP) was synthesized via a simple surface thiol-lactam initiated radical polymerization upon grafting from protocol. This can be achieved through the primary modification of the TiO2 surface with a silane coupling agent leading to thiol functionalized TiO2 (TiO2-SH). Subsequently, a controlled radical polymerization of 4-vinylpyridine in the presence of TiO2-SH and butyrolactam afforded PVP-g-TiO2 nanocomposites. The grafting of PVP on the surface of TiO2 was confirmed by FT-IR, TGA, XPS, EDX, TEM and SEM analyses. The UV-vis studies of the synthesized PVP-g-TiO2 nanocomposite demonstrated an exceptionally good dispersibility in organic solvents.</P>