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Md Mahbubur Rahman,Nazmun Naher,Md. Mofijul Isam,Moinul Hasan,Farhana Naznin,Mohammad Musharraf Uddin Bhuiyan,Farida Yeasmin Bari,Nasrin Sultana Juyena 사단법인 한국동물생명공학회 2020 한국동물생명공학회지 Vol.35 No.2
The pregnancy rate in indigenous ewes inseminated with frozen-thawed Suffolk semen following natural and synchronized estrus was determined. The serum Progesterone and Estrogen concentration and vaginal electrical resistance (VER) of ewes at the time of Artificial Insemination (AI) were observed as successful pregnancy determinants. 21 healthy ewes were selected for this experiment during January-April, 2017. 10 ewes were inseminated in natural estrus. Whereas, 11 ewes were inseminated after estrus synchronization using intravaginal sponges containing 60 mg medroxyprogesterone acetate. Trans-cervical Al (TCAI) was performed in all ewes within 12-16 hours of observed heat. Prostaglandin E1 analogue impregnated vaginal sponge was used for cervical relaxation 6-8 hours before insemination. Pregnancy was diagnosed through trans-abdominal ultrasonography after 40 days of AI. The pregnancy rate of ewes in synchronized estrus was higher (54.5%) than in natural estrus (30%). Higher serum Progesterone level (0.90 ± 0.02 ng/mL) and significantly (p < 0.001) lower VER (257.78 ± 10.11 ohm) were observed at the time of AI in ewes becoming pregnant. Results suggest that higher Progesterone concentration and lower VER could be considered as pregnancy indicators. Oestrous synchronization could be implemented to increase the pregnancy rate in ewes.
Application of Minimally Invasive Plate Osteosynthesis to Tibial Shaft Fractures in Dogs
Md. Mahbubur Rahman,정인성,김남수 한국임상수의학회 2017 한국임상수의학회지 Vol.34 No.3
The objective of this study was to evaluate the effectiveness of the minimally invasive plate osteosynthesis (MIPO) method for treatment of tibial shaft ractures in dogs by comparing MIPO radiographic and fracture healing time results with those from the popular open reduction and internal fixation (ORIF) technique. In this clinical study at the Royal Animal Medical Center, five consecutive dogs with diagnoses of comminuted tibial shaft fractures weretreated with the MIPO surgical approach. For comparison, an additional five breed-, age-, and weight-matched dogs with comminuted tibial shaft fractures were treated with the ORIF technique. Mean healing time was 75.6 ± 12.5 days in the MIPO group and 131.8 ± 18.6 days in the ORIF group (p < 0.01). The mean surgery time in the MIPO group (36.4 ± 3.5 minutes) was significantly shorter (p < 0.01) than that for the ORIF group (47.0 ± 2.2 minutes). Based onthe short surgical and healing times, the MIPO approach is clinically superior to the ORIF approach and should be the preferred approach in tibial fracture cases.
Md. Mahbubur Rahman,김영준,이재준 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.1
Poly(thionine) (PTH)-modified glassy carbon (PTH-S/GCE and PTH-D/GCE) and gold (PTH-S/Au) electrodes were prepared for the label-free detection of DNA hybridizations and their performances in terms of sensitivity and selectivity were compared. Single-strand probe DNA (pDNA) was immobilized on the PTH films via covalent bonding between the amine (−NH2) group of PTH and the phosphate (PO43−) group at the 5' end of the pDNA. The PTH oxidation current was decreased because of the increase in the stiffness of PTH films. The current was further decreased after the duplex was formed by the hybridization of the target complementary DNA (cDNA). The pDNA/PTH-S/GCE, pDNA/PTH-D/GCE, and pDNA/PTH-S/Au sensors showed excellent sensitivities of ca. 2.1, 55, and 1.9 μA/cm2/nM, respectively, and the detection limits (S/N = 3) were ca. 40.6, 1.5, and 45 pM, respectively, for the hybridization of target cDNA.
M. Mahbubur Rahman,Un Taek Lim 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.04
Riptortus pedestris (F.) (Hemiptera: Alydidae) is an important pest of soybeans in Korea and Japan. A synthetic aggregation pheromone trap has been commercialized and used in soybean fields in Korea for both monitoring and mass-capture of this bug. As the trap’s efficacy in reducing the pest population or crop damage is unknown, in this study we evaluated the aggregation pheromone trap in experimental soybean fields located in Andong National University. Two treatments, one with traps deployed for the entire cultivation period and one with no traps, were tested in six small experimental fields. The total numbers of R. pedestris (in all life stages) in soybean field were not significantly different between the treatments until August. But, in presence of pheromone, the pest’s abundance increased significantly in September and October. Relative to the size of the bug population in the field, trap catch rate was low during the fall (when bug density was highest) and high in early summer when the field population was very low. Placement of aggregation traps in plots caused pod and seed damage from R. pedestris to increase 2.7 and 2.2 times compared to the control. In conclusion, R. pedestris populations increased significantly during the fall in the presence of the aggregation pheromone trap, which should therefore be used with great caution whether as a control measure or as a monitoring tool.
Ensuring Quality in Biometric Systems
Md. Mahbubur Rahman,Amit Karmaker,Md.Mahmudul Hasan,Samsuddin Ahmed 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.4
Biometric system is using for personal recognition of people in many social and economical activities now a days. A good biometric trait should be measurable, distinctive and stable over time. Real-world deployment of biometric systems often has to contend with degraded signal quality and erratic behavior of the biometric data. For last few years biometric data quality measure become an important concern after poor pathological sample and other many causes. The user, sensor and environmental facts are causes to quality degradation of biometric system. This study approaches that have been used to extract additional information about the biometric data that can then be used to improve performance in degraded conditions and also discuss about the sensor and environmental facts .This study will also discuss how this problem can be overcome to maintain the quality in biometric system with a special emphasis on face, fingerprint, iris modalities with different organizational standards.
Mohammad Mahbubur Rahman,Xiao-Bo Li,Nasrin Siraj Lopa,이재준 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.7
Sub-micrometer size gold particles were electrodeposited on a transparent fluorine-doped tin oxide (FTO) from acetonitrile solution containing AuCl4 − and tetramethylammonium tetraflouroborate (TMATFB) for detecting NO2 −. A series of two-electron (2e−) and one-electron (1e−) reductions of the AuCl4 −-AuCl2 −-Au redox systems were observed at FTO and a highly stable and homogeneous distribution of Au on FTO (Au/FTO) was obtained by stepping the potential from 0 to −0.55 V (vs. Ag/Ag+). The Au/FTO electrode exhibited sufficiently high catalytic activity toward the oxidation of NO2 − with a detection limit (S/N = 3) and sensitivity of 2.95 μM and 223.4 μA·cm−2·mM−1, respectively, under optimal conditions. It exhibited an interference-free signal for NO2 − detection with excellent recoveries from real samples.
Md. Mahbubur, Rahman,Hyeong Cheol, Kang,Kicheon, Yoo,Jae-Joon, Lee The Korean Electrochemical Society 2022 Journal of electrochemical science and technology Vol.13 No.4
A chemically sintered and binder-free paste of TiO<sub>2</sub> nanoparticles (NPs) was prepared using a binary-liquid mixture of 1-octanol and CCl<sub>4</sub>. The 1:1 (v/v) complex of CCl<sub>4</sub> and 1-octanol easily interacted chemically with the TiO<sub>2</sub> NPs and induced the formation of a highly viscous paste. The as-prepared binary-liquid paste (P<sub>BL</sub>)-based TiO<sub>2</sub> film exhibited the complete removal of the binary-liquid and residuals with the subsequent low-temperature sintering (~150℃) and UV-O<sub>3</sub> treatment. This facilitated the fabrication of TiO<sub>2</sub> photoanodes for flexible dye-sensitized solar cells (f-DSSCs). For comparison purposes, pure 1-octanol-based TiO<sub>2</sub> paste (P<sub>O</sub>) with moderate viscosity was prepared. The P<sub>BL</sub>-based TiO<sub>2</sub> film exhibited strong adhesion and high mechanical stability with the conducting oxide coated glass and plastic substrates compared to the P<sub>O</sub>-based film. The corresponding low-temperature sintered P<sub>BL</sub>-based f-DSSC showed a power conversion efficiency (PCE) of 3.5%, while it was 2.0% for P<sub>O</sub>-based f-DSSC. The P<sub>BL</sub>-based low- and high-temperature (500℃) sintered glass-based rigid DSSCs exhibited the PCE of 6.0 and 6.3%, respectively, while this value was 7.1% for a 500℃ sintered rigid DSSC based on a commercial (or conventional) paste.
M. Mahbubur Rahman,Eunmok Kim,Mohammad M. H. Bhuyain,Dongmok Kim,Un Taek Lim 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04
Riptortus pedestris is an important soybean pest in Korea and Japan. Aggregation pheromone traps were evaluated in 12 soybean fields in Andong using three treatments of trap installation, i.e., installation for whole cultivation period, installation up to September, and no installation. The number of R. pedestris (in all life stages) were not significantly different among the treatments until October, but its abundance significantly increased at mid October in the fields where traps were installed. Trap catch of R. pedestris was relatively higher in August while bug population was low in the fields. However, in fall, R. pedestris populations become abundant in the fields while trap catch was low. There was no significant difference in parasitism as well as seed and pod damage among the treatments. In conclusion, aggregation pheromone trap should’nt be used as control measure, but can be used as a monitoring tool of R. pedestris population up to August in soybean field.
Effect of Titanium Nanorods in the Photoelectrode on the Efficiency of Dye Sensitized Solar Cells
Mohammad Mahbubur Rahman,김현용,Young-Deok Jeon,정인수,노광모,이재준 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
The effect of TiO2 nanorods (TNR) and nanoparticles (TNP) composite photoelectrodes and the role of TNR to enhance the energy conversion efficiency in dye-sensitized solar cells (DSSCs) was investigated. The 5% TNR content into the TNP photoelectrode significantly increased the short-circuit current density (Jsc) and the open-circuit potential (Voc) with the overall energy conversion efficiency enhancement of 13.6% compared to the pure TNP photoelectrode. From the photochemical and impedemetric analysis, the increased Jsc and Voc for the 5% TNR/TNP composite photoelectrode was attributed to the scattering effect of TNR, reduced electron diffusion path and the suppression of charge recombination between the composite photoelectrode and electrolyte or dye.