Kim, Nam-Kuk;Kim, Sung-Kon;Heo, Kang-Nyeong;Yoon, Duhak;Lee, Chang-Soo;Im, Seok-Ki;Park, Eung-Woo
Journal of Animal Science and Technology
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v.50
no.3
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pp.293-300
/
2008
Muscle fat content including intramuscular fat content(IMF) is the most important parameter in meat quality of cattle. Triacylglycerol is the major component of fat and is found in adipocyte and skeletal muscle. In present study, we carried out the determined of triacylglycerol contents and mRNA expression patterns of genes related with triacylglycerol biosynthesis such as ACSS2, GPAT, MGAT and DGAT in Hanwoo longissimus muscle using the real-time PCR. The triacylglycerol contents were continuously increased during the fattening stages. Interestingly, the contents of triacylglycerol were 7.4 fold higher(0.34 vs. 2.51, P<0.01) in 27 months old group than 12 months old group. The mRNA levels of ACSS2, GPAT and DGAT genes were also increased during fattening stages, whereas that of MGAT gene did not show difference among the stages. Thus, these results suggested that increasing of the triacylglycerol contents in longissimus muscle during fattening stages may be related with increased expressions of triacylglycerol biosynthesis genes(ACSS2, GPAT and DGAT). These results will be helpful to understand the mechanism of muscle fat deposition in skeletal muscle.
The elution behavior of polystyrenes(PS), polymethylmethacrylates (PMMA), polybutadienes(PB), PS-PMMA(SM) block copolymers and PS-PB star shaped copolymers on the cross-linked polystyrene gels was studied. An interpretation was proposed for the plots of log hydrodynamic volume versus retention volume of solutes in the mobile phases such as tetrahydrofuran, toluene, chloroform, methylene chloride and tetrahydrofuran-cyclohexane mixture. In order to predict the retention of solutes from their physical properties, multiple stepwise regression analysis was applied to obtain the correlation. The distribution coefficients($K_p$) of solute-gel interactions in GPC for homopolymers and PS copolymers were also obtained in terms of network-limited separation mechanism. In the cases of PS and PB, $K_p$ values approach unity, while $K_p$ values for PMMA decrease as MW increase in the good solvent, but in poor solvent, $K_p$ values increase as MW increase. $K_p$ values of PS copolymers are dependent on their MW and composition, therefore, morohology of SM block copolymer is predicted to be random phase. A single universal plot of log[η]M vs. $(V_r-V_o)/K_p$
Kim, Jisu;Kim, Minseok;Cho, Youngchan;Oh, Hyunjoo;Lee, Choonoh
Journal of Soil and Groundwater Environment
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v.26
no.6
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pp.106-117
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2021
The purpose of this study is prediction of landslide occurrence reflecting the subsurface flow characteristics within the soil layer in the future due to climate change in a large scale watershed. To do this, we considered the infinite slope stability theory to evaluate the landslide occurrence with predicted soil moisture content by SWAT model based on monitored data (rainfall-soil moisture-discharge). The correlation between the SWAT model and the monitoring data was performed using the coefficient of determination (R2) and the model's efficiency index (Nash and Sutcliffe model efficiency; NSE) and, an accuracy analysis of landslide prediction was performed using auROC (area under Receiver Operating Curve) analysis. In results comparing with the calculated discharge-soil moisture content by SWAT model vs. actual observation data, R2 was 0.9 and NSE was 0.91 in discharge and, R2 was 0.7 and NSE was 0.79 in soil moisture, respectively. As a result of performing infinite slope stability analysis in the area where landslides occurred in the past based on simulated data (SWAT analysis result of 0.7~0.8), AuROC showed 0.98, indicating that the suggested prediction method was resonable. Based on this, as a result of predicting the characteristics of landslide occurrence by 2050 using climate change scenario (RCP 8.5) data, it was calculated that four landslides could occur with a soil moisture content of more than 75% and rainfall over 250 mm/day during simulation. Although this study needs to be evaluated in various regions because of a case study, it was possible to determine the possibility of prediction through modeling of subsurface flow mechanism, one of the most important attributes in landslide occurrence.
Currently, the systems for culturing buffalo spermatogonial stem cells (SSCs) in vitro are varied, and their effects are still inconclusive. In this study, we compared the effects of culture systems with undefined (foetal bovine serum) and defined (KnockOut Serum Replacement) materials on the in vitro culture of buffalo SSC-like cells. Significantly more DDX4- and UCHL1-positive cells (cultured for 2 days at passage 2) were observed in the defined materials culture system than in the undefined materials system (p < 0.01), and these cells were maintained for a longer period than those in the culture system with undefined materials (10 days vs. 6 days). Furthermore, NANOS2 (p < 0.05), DDX4 (p < 0.01) and UCHL1 (p < 0.05) were expressed at significantly higher levels in the culture system with defined materials than in that with undefined materials. Induction with retinoic acid was used to verify that the cultured cells maintained SSC characteristics, revealing an SCP3+ subset in the cells cultured in the defined materials system. The expression levels of Stra8 (p < 0.05) and Rec8 (p < 0.01) were significantly increased, and the expression levels of ZBTB16 (p < 0.01) and DDX4 (p < 0.05) were significantly decreased. These findings provided a clearer research platform for exploring the mechanism of buffalo SSCs in vitro.
This paper criticizes the ontological and epistemological dichotomy in social sciences including social welfare and probes into Critical Realism as an alternative paradigm. Many theories for social welfare have adhered to dichotomous ontological standpoint, 'agency' vs. 'social structure', and Eco-system approach have occupied dominant position to integrate this dichotomy. These theoretical standpoint have had great influence on social work practice. On the other hand, dichotomous epistemological standpoint which is constituted of different views of phenomena, 'positivism' and 'constructionism', have had great influence on social work research and practice. These dichotomous ontological and epistemological approach have a limit to reveal qualitative nature of the relationship between agency and social structure, to ponder the deeper reality, the mechanism of stratified reality, and the reality being independent of agency. Replacing these approaches, Critical Realism unfold the theoretical potential as an alternative paradigm for social welfare through the discussion on stratified realty(the empirical, the actual, and the real), intransitive/transitive dimension, double hermeneutics in these dimensions, and the conditions for conceptualization, duality of structure and practice, transformation model of agency and structure.
Youn Seon Min;Oh Young Kee;Kim Joo Heon;Park Mi Ja;Seong In Ock;Kang Kimun;Chai Gyuyong
Radiation Oncology Journal
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v.23
no.1
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pp.51-60
/
2005
Purpose : Selective inhibition of multiple molecular targets may improve the antitumor activity of radiation. Two specific inhibitors of selective cyclooxygenase-2 (COX-2) and epidermal growth factor receptor (EGFR) were combined with radiation on the HeLa cell line. To investigate cooperative mechanism with selective COX-2 inhibitor and EGFR blocker, in vitro experiments were done. Materials and Methods : Antitumor effect was obtained by growth inhibition and apoptosis analysis by annexin V-Flous method. Radiation modulation effects were determined by the clonogenic cell survival assay. Surviving fractions at 2 Gy ($SF_2$) and dose enhancement ratio at a surviving fraction of 0.25 were evaluated. To investigate the mechanism of the modulation of radiosensitivity, the cell cycle analyses were done by flow cytometry. The bcl-2 and bax expressions were analyzed by western blot. Results : A cooperative effect were observed on the apoptosis of the HeLa ceil line when combination of the two drugs, AG 1478 and NS 398 with radiation at the lowest doses, apoptosis of $22.70\%$ compare with combination of the one drug with radiation, apoptosis of $8.49\%$. In cell cycle analysis, accumulation of cell on $G_0/G_l$ phase and decrement of S phase fraction was observed from 24 hours to 72 hours after treatment with radiation, AG 1478 and NS 398. The combination of NS 398 and AG 1478 enhanced radiosensitivity on a concentration-dependent manner in HeLa cells with dose enhancement ratios of 3.00 and $SF_2$ of 0.12 but the combination of one drug with radiation was not enhanced radlosensitivity with dose enhancement ratios of 1.12 and SF2 of 0.68 (p=0.005). The expression levels of bcl-2 and bax were reduced when combined with AG 1478 and NS 398. Conclusion : Our results indicate that the selective COX-2 inhibitor and EGFR blocker combined with radiation have potential additive or cooperative effects on radiation treatment and may act through various mechanisms including direct inhibition of tumor cell proliferation, suppression of tumor cell cycle progression and inhibition of anti-apoptotic proteins.
Background : Bronchial asthma has been known as an inflmmatory disease. There have been many evidences that polymorphonuclear leukocytes (PMN) might play an important role in the pathogrnesis of asthma. Although many investigators suggested that pneumocyte injury by PMN-derived oxygen radicals may contribute to the pathogenesis of asthma, there has been few report for a direct evidence of oxygen radicals-mediated pneumocyte injury in bronchial asthma. Furthermore the exact mechanism of oxygen radicals-mediated pneumocyte injury is still controversy. This study was designed to establish a direct in vitro evidence and its clinical significance of pneumocyte injury by PMN-derived superoxide anion in bronchial asthma and to elucidate the main mechanism of superoxide anion-mediated pneumocyte injury. Methods : 12 stable asthmatics and 5 healthy volunteers were participated in this study. PMN was separated from peripheral venous blood samples by using dextran sedimentation and Ficoll-Hypaque density gradient separation method. Superoxide anion productions by PMN and plasma SOD activities were measured by spectrophotometric assay using the principle of SOD inhibitable cytochrome c reduction. PMN-mediated pneumocyte injuries were measured by $^{51}Cr$-release assay using A549 pneumocytes and were expressed as percent lysis and percent detachment. Results: 1) PMN from asthmatics produced more amount of superoxide anion compared to PMN from normal subjects ($6.65{\pm}0.58$ vs $2.81{\pm}0.95\;nmol/1{\times}10^6$ cells, p<0.05), and showed an inverse correlation with $FEV_1$(R=-0.63, p<0.05), but no correlation with $PC_{20}$ histamine in asthmatics. 2) Plasma SOD activities were decreased in asthmatics compared to normal subjects but not significant, and showed a positive correlation with $FEV_1$(R=0.63, p<0.05) but no correlation with $PC_{20}$ histamine in asthmatics. 3) There were a positive correlation between plasma SOD activity and superoxide anion production by PMN in normal subjects (R=0.88, p<0.05) but not in asthmatics. 4) PMN-mediated pneumocyte injury was predominantly expressed as cell detachment rather than cell lysis in both groups, and PMN from asthmatics showed more potent cytotoxic effect on A549 pneumocytes compated to PMN from normal subjects. PMN-mediated detachment rather than lysis of A549 pneumocytes was significantly inhibited by in vitro SOD but not by diluted serum. 5) PMN-mediated detachment rather than lysis of A549 pneumocytes showed a good correlation with superoxide anion production by PMN (R=0.90 in normal subjects, R=0.82 in asthmatics, p<0.05) but no correlation with plasma SOD activity. PMN-mediated pneumocyte injuries were not correlated with $FEV_1$ or $PC_{20}$ histamine in asthmatics. 6) There were no significant differences in PMN-mediated pneumocyte injuries between allergic and nonallergic asthmatics. Conclusion : Our results suggest that pneumocyte injury by PMN-derived superoxide anion may partially contribute to the pathogenesis of asthma and that cell detachment rather than cell lysis may be the mechanism of superoxide anion-mediated pneumocyte injury.
Journal of Korean Society of Environmental Engineers
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v.34
no.2
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pp.91-96
/
2012
In this study we investigated the effects of operational parameters of a multi-layered soil filtration (filter depth, filtration velocity, and continuous/intermittent operation) on removal of pollutants in river water. As filter depth increased removal of all the pollutants (COD, TP, TN, and $NH_4$-N) was increased because the increase in filter depth increased in contact time between media and pollutants. The removal of TP and $NH_4$-N more increased with the increase in filter depth, comparing to the biological COD removal which was performed only in the top layer, since the removal mechanism of TP and $NH_4$-N was physicochemical process occurring throughout the whole layers. However, the reduction in filtration velocity resulted in decrease of removal all the pollutants removal due to shorter retention time. Biological COD removal was more influenced with the reduction in filtration velocity (longer retention time), than the removal of TP and $NH_4$-N. Because biological process was occurred only in the top layer which has relatively shorter retention time, comparing with physicochemical process occurred throughout whole media. Therefore, it is desirable that the operation parameters be controlled toward increasing retention time, in order to achieve efficient pollutants removal. The change in operation mode (continuos vs. intermittent operations) did not provide significant effects on the pollutant treatment efficiency by the multi-layered soil filtration system. Our findings suggest that for stable long-term operation it should be considered keeping conditions for biological activity and accelerating clogging.
Purpose : This study was performed not only to compare the brain activation regions associated with sexual arousal induced by visual stimulation and SP6 acupuncture, but also to evaluate its differential neuro-anatomical mechanism in healthy women using functional magnetic resonance imaging (fMRI) at 3 Tesla (T). Subjects and methods : A total of 21 healthy right-handed female volunteers (mean age 22 years, range 19 to 32) underwent fMRI on a 3T MR scanner. The stimulation paradigm for sexual arousal consisted of two alternating periods of rest and activation. It began with a 1-minute rest period, 3 minutes of stimulation with either of an erotic video film or SP6 acupuncture, followed by 1-minute rest. In addition, a comparative study on the brain activation patterns between an acupoint and a shampoint nearby GB37 was performed. The fMRI data were obtained from 20 slices parallel to the AC-PC line on an axial plane, giving a total of 2,000 images. The mean activation maps were constructed and analyzed by using the statistical parametric mapping (SPM99) software. Results : As comparison with the shampoint, the acupoint showed 5 times and 2 times higher activities in the neocortex and limbic system, respectively. Note that brain activation in response to stimulation with the shampoint was not observed in the regions including the HTHL in the diencephalon, GLO and AMYG in the basal ganglia, and SMG in the parietal lobe. In the comparative study of visual stimulation vs. SP6 acupuncture, the mean activation ratio of stimulus was not significantly different to each other in both the neocortex and the limbic system (p < 0.05). The mean activities induced by both stimuli were not significantly different in the neocortex, whereas the acupunctural stimulation showed higher activity in the limbic system (p < 0.05). Conclusions : This study compared the differential brain activation patterns and the neural mechanisms for sexual arousal, which were induced by visual stimulation and SP6 acupuncture by using 3T fMRI. These findings will be useful to understand the theory of traditional acupuncture and acupoint channel in scientific point of view.
Kim, Chong-Ju;Yeon, Kyu-Min;Kim, Shin-Tae;Wang, Joon-Ho;Yoo, Kwang-Ha
Tuberculosis and Respiratory Diseases
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v.52
no.6
/
pp.608-615
/
2002
Background : ADA is an enzyme found in most cells, and is involved in purine metabolism, but its chief role concerns the proliferation and differentiation of lymphocytes, especially T-lymphocytes. For that reason ADA has been looked on as a marker of cell-mediate immunity, which is the key mechanism of the tuberculous pleural effusion. Thus, the pleural fluid ADA activity is increased in the tuberculous pleural effusion. Age associated immune decline is characterized by decreases in both B and T-lymphocyte function and the former may be largely a result of the latter. Therefore, the pleural fluid ADA activity would be lower in old rather than in young, patients with tuberculous pleural effusion. We studied the relationship between age, and pleural fluid ADA activity, in patients with tuberculous pleural effusion. Materials and Methods : In the 46 patients with tuberculous pleural effusion enroll in this study, the pleural fluid ADA activities were measured by means of an automated kinetic method. Results : The mean age of the patients was $53.0{\pm}22.0$ years, with a male to female ratio of 30:16. The patients were divided into two groups, young patients, regarded as < 65 and old regarded as ${\geq}65$ years with 28 and 18 patients, respectively. The pleural fluid ADA activity in both groups show significant differences : $99.4{\pm}22.6$ IU/L(young patients) Vs. $75.8{\pm}30.9$ IU/L(old patients)(p<0.05), but a negative correlation with age (r=-0.311, p<0.05). Conclusion : Although pleural fluid ADA activity was not adequately increased, tuberculous pleural effusion, in older patients, would have to be considered clinically suspicious tuberculous pleural effusion.
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