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Correlations between abnormalities of morphological details and DNA fragmentation in human sperm
Nguyen, Hiep Tuyet Thi,Dang, Hong Nhan Thi,Nguyen, Thai Thanh Thi,Nguyen, Trung Van,Dang, Thuan Cong,Nguyen, Quoc Huy Vu,Le, Minh Tam The Korean Society for Reproductive Medicine 2022 Clinical and Experimental Reproductive Medicine Vol.49 No.1
Objective: As the associations of sperm DNA fragmentation with morphology have not been examined in detail, this study aimed to investigate the relationship between abnormalities of morphological details and DNA integrity in human sperm. Methods: In this cross-sectional study, men from infertile couples were enrolled at Hue Center for Reproductive Endocrinology and Infertility, Vietnam. Conventional semen parameters, including morphological details, were analyzed following the World Health Organization 2010 criteria. Sperm DNA fragmentation was evaluated using a sperm chromatin dispersion assay. The relationships and correlations between semen parameters, sperm morphology, and the type of halosperm and the DNA fragmentation index (DFI) were analyzed. Results: Among 130 men in infertile couples, statistically significant differences were not found in the sperm halo type between the normal and abnormal sperm morphology groups. The percentage of round-head spermatozoa was higher in the DFI >15% group (16.98%±12.50%) than in the DFI ≤15% group (13.13% ±8.82%), higher values for amorphous heads were found in the DFI >15% group, and lower values for tapered heads were observed in the DFI ≤15% group; however, these differences were not statistically significant. Small-halo sperm and the DFI were positively correlated with round-head sperm (r=0.243, p=0.005 and r=0.197, p=0.025, respectively). Conclusion: The rate of general sperm morphological abnormalities in semen analysis was not related to sperm DNA integrity. However, round sperm heads were closely associated with sperm DNA fragmentation.
Nguyen, Thi Hong Nhan,Nguyen, Van Hon,Nguyen, Trong Ngu,Nguyen, Tien Von,Preston, T.R.,Leng, R.A. Asian Australasian Association of Animal Productio 2001 Animal Bioscience Vol.14 No.4
Farmers in the centre of Vietnam have a tradition of dosing young cattle with groundnut oil before fattening them on a diet of rice straw and road-side grass. These farmers claim the cattle grow faster. It was hypothesized that the effect of the oil could be to eliminate the protozoa from the rumen. This is known to increase the net microbial growth efficiency in the rumen and increase the protein supply to the animal. To test this hypothesis, two experiments were undertaken; one on-station with four cattle fitted with rumen cannulae and the second a growth trial with 25 young cattle in smallholder farms. When the cannulated animals were drenched with groundnut oil, the protozoa were eliminated from the rumen and animals could be kept free of protozoa by isolation. The ammonia concentration in the rumen fluid was decreased when the protozoa were eliminated and there was an indication of improved rumen dry matter degradability of the forage components of the diet. In the practical condition on the smallholder farms, the growth rates of cattle drenched with groundnut oil were increased considerably (65%) compared with untreated control animals. The laboratory results when taken together with the on-farm results indicate that these resource-poor farmers had been able to defaunate their cattle and to maintain the fauna-free state by isolation of their animals from extraneous stock. This traditional practice in Central Vietnam, whereby one family keeps only one or two animals that are hand fed and tethered, has quite a large potential for all of those countries where animals are fed agro-industrial by-products, as it is highly economic. The use of 1 litre of oil compared with 1 kg of rice polishing per day (300 kg over 300 days), would be highly profitable in all countries of South-East Asia.
Thi Nhan Nguyen,Van Cong Le,Byung Ryeon Kim,Chan Woo Park 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In this study, the heat transfer characteristics of evaporation and condensation is predicted using artificial intelligence. Evaporator and condenser are the core-parts of absorption refrigeration system, the optimization of evaporator and condenser can be done by improving the wettability and reducing the uneven distribution of liquid film. In terms of heat transfer efficiency, to improve the heat transfer coefficient and Nusselt number (Nu). In this study, a Random Forest Regression (RFR) model is used to predict Nu in the case evaporator and condenser. The prediction performance of Random Forest Regression model is evaluated by mean square error (MSE), mean absolute percentage error (MAPE), and coefficient of determination R2 (score). The results proved that RFR model predict Nu in both case with high performance.
Nguyen Quang Bau,Thi Thanh Nhan,Nguyen Vu Nhan 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.4
Analytic expressions for the absorption coefficient (ACF) of a weak electromagnetic wave (EMW)caused by electrons confined in rectangular quantum wires (RQWs) in the presence of laser radiationare calculated using the quantum kinetic equation for electrons in the case of electron-optical phononscattering. The dependence of the ACF of a weak EMW on the intensity E01 and the frequency 1 of the external laser radiation, the intensity E02 and the frequency2 of the weak EMW, thetemperature T of the system and the size L (Lx and Ly) of the RQWs is obtained. The resultsare numerically calculated and discussed for GaAs/GaAsAl RQWs. The numerical results showthat the ACF of a weak EMW in RQWs can have negative values. Thus, in the presence of laserradiation, under proper conditions, a weak EMW is increased. This is different from the similarproblem in bulk semiconductors and from the case without laser radiation
Phenylpropanoids from Lilium Asiatic hybrid flowers and their anti-inflammatory activities
Nhan Nguyen Thi,송혜승,오은지,이영근,고정환,권정은,강세찬,이대영,정인호,백남인 한국응용생명화학회 2017 Applied Biological Chemistry (Appl Biol Chem) Vol.60 No.5
Three phenylpropanoids were isolated from the flowers of Lilium Asiatic hybrids through repeated silica gel or octadecyl silica gel column chromatographies. The chemical structures were determined to be 1-O-trans-caffeoyl- b-D-glucopyranoside (1), regaloside A (2), and regaloside B (3), based on spectroscopic data gathered from nuclear magnetic resonance (NMR) spectroscopy, electron ionization mass spectrometry (EI/MS), polarimetry, and infrared spectroscopy (IR) experiments. Compounds 1 and 2 showed significant DPPH radical scavenging activity of 60.1 and 58.0% at 160 ppm, respectively, compared with the 62.0% activity of the positive control, a-tocopherol. At a concentration of 50 lg/mL, compounds 1–3 inhibited the expression of iNOS to 4.1 ± 0.01, 70.3 ± 4.07, and 26.2 ± 0.63, respectively, and decreasing COX-2 expression to 67.8 ± 4.86, 131.6 ± 8.19, and 98.9 ± 4.99. Also, at the same concentration, compounds 1–3 decreased the ratio of p-p65/p-65 to 43.8 ± 1.67, 40.7 ± 1.30, and 43.2 ± 1.60, respectively, and the expression of VCAM-1 to 42.1 ± 2.31, 48.6 ± 2.65, and 33.8 ± 1.74, respectively.
Thi Nhan Nguyen,Van Cong Le,Byung Ryeon Kim,Chan Woo Park 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In this study, the heat transfer characteristics of evaporation and condensation is predicted using artificial intelligence. Evaporator and condenser are the core-parts of absorption refrigeration system, the optimization of evaporator and condenser can be done by improving the wettability and reducing the uneven distribution of liquid film. In terms of heat transfer efficiency, to improve the heat transfer coefficient and Nusselt number (Nu). In this study, a Random Forest Regression (RFR) model is used to predict Nu in the case evaporator and condenser. The prediction performance of Random Forest Regression model is evaluated by mean square error (MSE), mean absolute percentage error (MAPE), and coefficient of determination R2 (score). The results proved that RFR model predict Nu in both case with high performance.
NaClO3를 함유한 염산용액으로 몰리브데나이트광의 침출
Thi Nhan Hau Nguyen,Thi Thu Huong Nguyen,이만승 한국자원리싸이클링학회 2022 資源 리싸이클링 Vol.31 No.5
Molybdenum is widely used in many materials; thus, its recovery from ores and secondary resources has attracted considerable attention. In this study, the leaching of molybdenite ore using hydrochloric acid containing sodium chlorate as an oxidizing agent was studied. The effects of several variables, such as the concentrations of HCl and NaClO3, reaction temperature and time, and pulp density, on the leaching of the ore were investigated. Under strong acidic and oxidizing conditions, the sulfide in the ore was dissolved as a sulfate ion, which formed gypsum with Ca(II), leading to a decrease in the leaching percentage of Mo(VI) from the ore. The leaching percentage of molybdenum was greater than 90%, while those of iron, calcium, and silicon were 38, 29, and 67%, respectively, under the optimum conditions: 2.0 M HCl, 0.5 M NaClO3, pulp density of 5 g/L, temperature of 90 °C, and treatment time of 60 min. 몰리브덴은 소재로 널리 사용되므로 광석 또는 2차자원으로부터 회수가 많은 관심을 끌고 있다. 몰리브데나이트광으로부터 산화제로NaClO3를 함유한 염산용액에 의한 몰리브데나이트광의 침출에 대해 조사했다. 염산 및 NaClO3의 농도, 반응 온도 및 시간과 광액밀도가 광석의 침출에 미치는 영향을 조사했다. 산화력이 센 강산용액에서 황화광은 황산이온으로 산화되면서 용해되어 칼슘이온과 gypsum 을 형성하여 몰리브덴(VI)의 침출률을 감소시켰다. 최적조건(2.0 M HCl, 0.5 M NaClO3, 광액밀도 5 g/L, 90, 60분)에서 몰리브덴, 철, 칼슘 및 실리케이트의 침출률은 각각 90, 38, 29 및 67%이었다.