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Development of an optimal protocol to induce capacitation of boar spermatozoa in vitro
Seung-Ik Jang,Jae-Hwan Jo,Eun-Ju Jung,Woo-Jin Lee,Ju-Mi Hwang,Jeong-Won Bae,Woo-Sung Kwon The Korean Society of Animal Reproduction and Biot 2022 한국동물생명공학회지 Vol.37 No.4
In 1951, Colin Russell Austin and Min Chueh Chang identified "capacitation", a special process involving ejaculated spermatozoa in the female reproductive tract. Capacitation is a phenomenon that occurs in vivo, but almost all knowledge of capacitation has been obtained from in vitro studies. Therefore, numerous trials have been performed to establish in vitro capacitation methods for various studies on reproduction. Although a series of studies have been conducted to develop an optimal protocol for inducing capacitation, most have focused on identifying the appropriate chemical compounds to induce the capacitation of boar spermatozoa in vitro. Therefore, the purpose of this study was to identify the optimal incubation time for inducing capacitation in vitro. Duroc semen was incubated for various periods (60, 90, and 120 min) to induce capacitation. Sperm function (sperm motility, motion kinematic parameters, and capacitation status) was evaluated. The results showed that total sperm motility, rapid sperm motility, progressive sperm motility, curvilinear velocity, and average path velocity significantly decreased in a time-dependent manner. However, the capacitation status did not show any significant changes. Taken together, these results indicate that an incubation time of more than 60 min suppresses sperm motility and motion kinematic parameters. Therefore, we suggest that 60 min may be the best incubation time to induce capacitation without negative effects on sperm motility and motion kinematics in boar spermatozoa in vitro.
회분식 유동층에서 압력요동특성치를 이용한 유연탄의 산화방지제 효과 해석
장준호(Jun-Ho Jang),조정익(Jeong-Ik Cho),김지원(Ji-Won Kim),장윤영(Yoon-Young Jang),서동주(Dong-Ju Seo),박성준(Seong-Jun Park),이광희(Qhwang-Hee Rhee),박태성(Tae-Sung Park),장현태(Hyun-Tae Jang) 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.10
유연탄의 자연발화억제제 효과를 해석하고자 회분 유동층에서 유동화 특성 변화에 따른 압력요동 특성치, 온도 곡선을 유동층 축방향 위치에 따라 측정하였다. 유연탄의 자연발화 특성을 해석하기 위하여 내경 0.109 m의 유동층 반응기에서 회분식 석탄 시료 투입에 따른 유동화 특성과 탈휘발 및 점화 특성 실험을 수행하였다. 일반적으로 점화온도 이하에서 실험을 수행하여 산화 방지제에 의한 탈휘발 및 초기 발화점을 중심으로 연구를 수행하였다. 회분식 석탄시료 투입시 시간에 따른 압력요동 특성치의 평균압력, 압력요동의 표준편차, power spectrum, 온도 곡선을 이용하여 회분식 유동층에서 탈휘발 및 점화 특성을 측정하였다. 회분식 유동층 온도, 자연발화 억제제 적용량, 유동화 매질의 입자 크기에 따른 영향을 고찰하였다. 유연탄에 산화방지제 혼합량 0.16g 자연발화 억제제/1kg 석탄 이상의 적용량에서 유연탄의 탈휘발 및 점화 속도의 지연이 발생하였다. 저품위 갈탄의 경우 산화 방지제에 의한 발화 지연 영향이 더욱 크게 나타났다. 이러한 지연 효과는 유동층연소로의 연소 온도에서는 거의 영향이 없음을 알 수 있었다. The spontaneous ignition inhibitor effect on bituminous coal was analyzed by measuring the pressure fluctuation properties and temperature profiles. Characteristics of spontaneous ignition of bituminous coal, experiments on devolatilization of coal, and ignition according to batch feeding of coal were performed in a fluidized bed(I.D. 0.109m, bed height 0.9m). The bed temperature was maintained below the bituminous coal ignition temperature. The devolatilization and initial ignition temperature change by the antioxidant were measured, and the characteristics were determined in the batch fluidized bed using pressure fluctuations such as mean pressure, standard deviation of pressure fluctuations, power spectrum, and temperature profile according to operation time when the coal sample was batch feeding. We further examined the effects of spontaneous ignition inhibitor mixing fraction on the spontaneous ignition temperature and particle size of the in-bed material. The devolatilization of the bituminous coal and the ignition rate decreased at the mixing fraction of 0.16g spontaneous ignition inhibitor/1kg coal. In the case of low-grade lignite, the decreased ignition effect by the antioxidant was observed to increase. It was found that spontaneous ignition inhibitor has no effect on coal combustion at the combustion temperature of the fluidized bed combustor.
Ik-Sang Jang,Hyung-Woo Lee,Won-Ho Kim,Su-Yeon Cho,Mi-Jung Kim,Ki-Doek Lee,Ju Lee 한국자기학회 2011 Journal of Magnetics Vol.16 No.1
Interior permanent-magnet synchronous motors (IPMSMs) produce both magnetic and reluctance torques. The reluctance torque is due to the difference between the d- and q-axis inductances based on the geometric rotor structure. The steady-state performance analysis and precise control of the IPMSMs greatly depend on the accurate determination of the parameters. The three essential parameters of the IPMSMs are the armature flux linkage of the permanent magnet, the d-axis inductance, and the q-axis inductance. In the basic design step of an IPMSM, the inductance parameters are very important for determining the motor characteristics, such as the input voltage, torque, and efficiency. Thus, it is very important to accurately estimate the values of the motor inductances. The inductance parameters of IPMSMs have nonlinear characteristics along the magnet size because the iron core is saturated by the magnet and armature reaction fluxes. In this study, the inductance parameters were calculated using both the magnetic-equivalent-circuit method and the finite-element method (FEM). Then the calculated parameters were compensated by the saturation coefficient function, which was also calculated via the magnetic-equivalent-circuit method and FEM.
( Ju No Jang ),( Sung Hwan Hong ),( Ik Hwan Kim ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.1
A method for the rapid detection and quantification of Newcastle disease virus (NDV) produced in an animal cell culture-based production system was developed to enhance the speed of the NDV vaccine manufacturing process. A SYBR Green I-based real-time RT-PCR was designed with a conventional, inexpensive RT-PCR kit targeting the F gene of the NDV LaSota strain. The method developed in this study was validated for specificity, accuracy, precision, linearity, limit of detection (LOD), limit of quantification (LOQ), and robustness. The validation results satisfied the predetermined acceptance criteria. The validated method was used to quantify virus samples produced in an animal cell culture-based production system. The method was able to quantify the NDV samples from mid- or late-production phases, but not effective on samples from the early-production phase. For comparison with other quantifiable methods, immunoblotting, plaque assay, and tissue culture infectious dose 50 (TCID50) assay were also performed with the NDV samples. The results demonstrated that the real-time RT-PCR method is suitable for the rapid quantification of virus particles produced in an animal cell-culture-based production system irrespective of viral infectivity.
비소세포폐암의 난소전이 환자에서 Erlotinib을 사용한 치료
정익주,임승택,최연석,장태수,오선희,이주아,조도연 이화여자대학교 의과학연구소 2015 EMJ (Ewha medical journal) Vol.38 No.1
Ovarian cancer is generally primary cancer and less frequently originates from metastasis from non-gynecological cancer. Ovarian metastasis from lung cancer represents only 2~4% of all ovarian metastatic cancers. We report a case of ovarian metastasis of non-small cell lung cancer with epidermal growth factor receptor mutation. The patient underwent cytoreductive surgery for the ovarian mass and erlotinib therapy for the metastatic lung cancer. Erlotinib therapy markedly decreased the size of lung mass.
Jang, Hyeon-Gap,Lim, Jun-Tae,Oh, Ju-Hwan,Lee, Seon-Young,Kim, Yong-Ik,Lee, Jin-Seok The Korean Society for Preventive Medicine 2012 Journal of Preventive Medicine and Public Health Vol.45 No.2
Objectives: While there have been many quantitative studies on the public's attitude towards mental illnesses, it is hard to find quantitative study which focused on the contextual effect on the public's attitude. The purpose of this study was to identify factors that affect the public's beliefs and attitudes including contextual effects. Methods: We analyzed survey on the public's beliefs and attitudes towards mental illness in Korea with multi-level analysis. We analyzed the public's beliefs and attitudes in terms of prejudice as an intermediate outcome and social distance as a final outcome. Then, we focused on the associations of factors, which were individual and regional socioeconomic factors, familiarity, and knowledge based on the comparison of the intermediate and final outcomes. Results: Prejudice was not explained by regional variables but was only correlated with individual factors. Prejudice increased with age and decreased by high education level. However, social distance controlling for prejudice increased in females, in people with a high education level, and in regions with a high education level and a high proportion of the old. Therefore, social distance without controlling for prejudice increased in females, in the elderly, in highly educated people, and in regions with a high education and aged community. Conclusions: The result of the multi-level analysis for the regional variables suggests that social distance for mental illness are not only determined by individual factors but also influenced by the surroundings so that it could be tackled sufficiently with appropriate considering of the relevant regional context with individual characteristics.