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RISS 인기검색어
- 검색키워드
- 저자 : Jiyoung Jeong (검색결과 348 건)
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Light Scattering Study of Glass Transition Temperatures of Glucose-Water Mixtures
서정아,오지영,김형국,황윤회 부산대학교 유전체물성연구소 2004 유전체 논문집 Vol.3 No.
We studied glass transition temperatures of glucose-water mixtures by using Brillouin light scattering. We fitted the polarized components of the Brillouin spectra measured by backscattering geometry to simple Lorentzian form and estimated the glass transition temperature from the slope of the temperature-dependent Brillouin peak shift.
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Jeong, Yu Jeong,An, Chul Han,Park, Sung-Chul,Pyun, Jang Won,Lee, Jiyoung,Kim, Suk Weon,Kim, Hyun-Soon,Kim, HyeRan,Jeong, Jae Cheol,Kim, Cha Young American Chemical Society 2018 Journal of agricultural and food chemistry Vol.66 No.16
<P>Isoflavonoids are a class of biologically active natural products that accumulate in soybean (<I>Glycine max</I> L.) seeds during development, play vital roles in plant defense, and act as phytoestrogens with important human health benefits. Plant cell suspension cultures represent an excellent source of biologically important secondary metabolites. We found that methyl jasmonate (MJ) treatment increased isoflavone production in soybean suspension cell cultures. To investigate the underlying mechanism, we examined the expression of structural genes (<I>CHS6</I>, <I>CHS7</I>, <I>CHI1</I>, <I>IFS1</I>, <I>IFS2</I>, <I>IFMaT</I>, and <I>HID</I>) in the isoflavonoid biosynthesis pathways in soybean suspension cells under various abiotic stress conditions. MJ treatment had the most significant effect on gene expression and increased the production of three glycosidic isoflavones (daidzin, malonyldaidzin, and malonylgenistin), with the maximum total isoflavone production (∼10-fold increase) obtained on day 9 after MJ application. MJ treatment significantly increased total phenolic contents and upregulated isoflavonoid biosynthesis genes, shedding light on the underlying mechanism.</P> [FIG OMISSION]</BR>
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Jeong, Jiyoung,Shin, Choongsoo S. Korean Society of Sport Biomechanics 2017 한국운동역학회지 Vol.27 No.3
Objective: The aim of this study was to examine the effect of foot landing type (forefoot vs. rearfoot landing) on kinematics, kinetics, and energy absorption of hip, knee, and ankle joints. Method: Twenty-five healthy men performed single-leg landings with two different foot landing types: forefoot and rearfoot landing. A motion-capture system equipped with eight infrared cameras and a synchronized force plate embedded in the floor was used. Three-dimensional kinematic and kinetic parameters were compared using paired two-tailed Student's t-tests at a significance level of .05. Results: On initial contact, a greater knee flexion angle was shown during rearfoot landing (p < .001), but the lower knee flexion angle was found at peak vertical ground reaction force (GRF) (p < .001). On initial contact, ankles showed plantarflexion, inversion, and external rotation during forefoot landing, while dorsiflexion, eversion, and internal rotation were shown during rearfoot landing (p < .001, all). At peak vertical GRF, the knee extension moment and ankle plantarflexion moment were lower in rearfoot landing than in forefoot landing (p = .003 and p < .001, respectively). From initial contact to peak vertical GRF, the negative work of the hip, knee, and ankle joint was significantly reduced during rearfoot landing (p < .001, all). The contribution to the total work of the ankle joint was the greatest during forefoot landing, whereas the contribution to the total work of the hip joint was the greatest during rearfoot landing. Conclusion: These results suggest that the energy absorption strategy was changed during rearfoot landing compared with forefoot landing according to lower-extremity joint kinematics and kinetics.
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Jeong, Jiyoung,Lee, Seonghan,Kim, Sung-Hyun,Han, Youngju,Lee, Dong-Keon,Yang, Jun-Young,Jeong, Jayoung,Roh, Changhyun,Huh, Yun Suk,Cho, Wan-Seob Informa UK (TaylorFrancis) 2016 Nanotoxicology Vol.10 No.10
<P>Although surface area metric was suggested as an appropriate dose metric for acute lung inflammation of NPs, it might not be effective for fast-dissolving NPs because they lose their reactive surface when dissolved in the phagolysosomes. Herein, we evaluated the dose metric for fast-dissolving NPs using a rat intratracheal instillation model. A panel of fast-dissolving NPs (CoO, CuO and ZnO) and their constituent metal ions (CoCl2, CuCl2 and ZnCl2) were compiled and each compound was intratracheally instilled into the lungs of female Wistar rats at the same molar concentrations in the NP doses (40, 100 and 400g/rat). The toxicity endpoints including cytological and biochemical data in bronchoalveolar lavage fluid were evaluated at 24h after instillation. To evaluate the dose metric, each toxicity endpoint was plotted against the instilled dose (mass or surface area) or the equivalent dose (mass or surface area) that was weighted by the ratio of specific dose-generated responses between metal chlorides. Dose-response curves of fast-dissolving NPs about percentage of granulocytes, lactate dehydrogenase levels and total protein levels showed similar pattern but slightly less potential than those of their respective metal chlorides. When each toxicity endpoint was plotted against the equivalent mass dose, three types of NPs showed more overlapping dose-response curves than other dose metrics. In conclusion, this study implies that the equivalent mass dose is an appropriate dose metric for fast-dissolving NPs and the main factor determining the slope of the dose-response curve is the intrinsic toxicity of the their constituent ions.</P>
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( Jiyoung Jeong ),( Choongsoo S. Shin ) 한국체육학회 2016 국제스포츠과학 학술대회 Vol.2016 No.1
Purpose: The purpose of this study was to examine the effect of two different landing techniques (forefoot and rearfoot) on lower extremity joint kinematics and /kinetics during single leg landing. Method: Five males (age: 25.6±1.5 yrs, height: 174.6±3.4 cm, mass: 70.4±4.3 kg) were recruited. All participants performed single leg landing by stepping off a 30-cm platform in two different landing techniques; forefoot and rearfoot contact landing. Three dimensional hip, knee, and ankle joint kinematics and kinetics were calculated using motion capture system equipped with six infrared cameras sampled at 400Hz. Obtained kinematic and kinetic parameters were compared using a paired two-tailed Student’s t test at a significance level of 0.05. Result: At initial contact, there were significant differences in the ankle plantar(+)/dorsi(-) flexion angle (forefoot: 10.7±2.0°, rearfoot: -21.2±8.5°, p<0.001), the ankle inversion(+)/eversion(-) angle (forefoot: 2.3±1.5°, rearfoot: -0.1±1.1°, p=0.017), and the hip external(+)/internal(-) rotation angle (forefoot: 9.8±3.1°, rearfoot: -1.1±3.7°, p=0.001). The peak knee extension moment (forefoot: 0.222±0.021 Nm/(BW*Ht), rearfoot: 0.260±0.042 Nm/(BW*Ht), p<0.001), the peak knee valgus moment (forefoot: 0.078±0.005 Nm/(BW*Ht), rearfoot: 0.090±0.021 Nm/(BW*Ht), p<0.001), and the peak tibial internal rotation moment (forefoot: 0.012±0.004 Nm/(BW*Ht), rearfoot: 0.009±0.002 Nm/(BW*Ht), p<0.001) were significantly greater during rearfoot landing when compared to forefoot landing. The peak ankle plantarflexion moment was significantly smaller during rearfoot landing (forefoot: 0.239±0.058 Nm/(BW*Ht), rearfoot: 0.139±0.030 Nm/(BW*Ht), p<0.001), but the peak ankle varus moment was greater than forefoot landing (forefoot: 0.025±0.011 Nm/(BW*Ht), rearfoot: 0.041±0.013 Nm/(BW*Ht), p<0.001). Conclusion: The present study showed significant differences in 3D hip, knee, and ankle joint kinematics and kinetics between forefoot and rearfoot landing. The combination of the knee valgus and internal tibial rotation moment increase the risk of anterior cruciate ligament injury. Also, many ankle sprains occur during the combined movement of inversion and plantarflexion. Therefore, the results of this study suggest that altering landing technique may bring the lower extremity injury risks.
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Jiyoung Kim,JooYeon Jhun,Jin Seok Woo,Seung Hoon Lee,Jeong-Hee Jeong,KyungAh Jung,Wonhee Hur,Seon-Yeong Lee,Jae Yoon Ryu,Young-Mee Moon,Yoon Ju Jung,Kyo Young Song,Kiyuk Chang,Seung Kew Yoon,Sung-Hwan 한국실험동물학회 2021 한국실험동물학회 학술발표대회 논문집 Vol.2021 No.7
Obesity, a condition characterized by excessive accumulation of body fat, is a metabolic disorder related to an increased risk of chronic inflammation. Obesity is mediated by signal transducer and activator of transcription (STAT) 3, which is regulated by genes associated with retinoid interferon-induced mortality (GRIM) 19, a protein ubiquitously expressed in various human tissues. In this study, we investigated the role of GRIM19 in diet-induced obese C57BL/6 mice via intra venous or intramuscular administration of a plasmid encoding GRIM19. Splenocytes from wild-type and GRIM19-overexpressing mice were compared using enzyme-linked immunoassay, real-time polymerase chain reaction, Western blotting, flow cytometry, and histological analyses. GRIM19 attenuated the progression of obesity by regulating STAT3 activity and enhancing brown adipose tissue (BAT) differentiation. GRIM19 regulated the differentiation of mouse-derived 3T3-L1 preadipocytes into adipocytes, while modulating gene expression in white adipose tissue (WAT) and BAT. GRIM19 overexpression reduced diet-induced obesity and enhanced glucose and lipid metabolism in the liver. Moreover, GRIM19 overexpression reduced WAT differentiation and induced BAT differentiation in obese mice. GRIM19-transgenic mice exhibited reduced mitochondrial superoxide levels and a reciprocal balance between Th17 and Treg cells. These results suggest that GRIM19 attenuates the progression of obesity by controlling adipocyte differentiation.
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( Jiyoung Jeong ),( Choongsoo S. Shin ) 한국운동역학회 2016 한국운동역학회지 Vol.26 No.2
Objective: The purpose of this study was to determine the knee and ankle joint kinematics and kinetics bycomparing downhill walking with valley-shape combined slope walking.Method: Eighteen healthy men participated in this study. A three-dimensional motion capture systemequipped with eight infrared cameras and a synchronized force plate, which was embedded in the slopedwalkway, was used. Obtained kinematic and kinetic parameters were compared using paired two-tailedStudent``s t-tests at a significance level of 0.05.Results: The knee flexion angle after the mid-stance phase, the mean peak knee flexion angle in the earlyswing phase, and the ankle mean peak dorsiflexion angle were greater during downhill walking comparedwith valley-shape combined slope walking (p < 0.001). Both the mean peak vertical ground reaction force(GRF) in the early stance phase and late stance phase during downhill walking were smaller than thosevalues during valley-shape combined slope walking. (p = 0.007 and p < 0.001, respectively). The mean peakanterior GRF, appearing right after toe-off during downhill walking, was also smaller than that of valleyshapecombined slope walking (p = 0.002). The mean peak knee extension moment and ankle plantar flexionmoment in late stance phase during downhill walking were significantly smaller than those of valleyshapecombined slope walking (p = 0.002 and p = 0.015, respectively).Conclusion: These results suggest that gait strategy was modified during valley-shape combined slopewalking when compared with continuous downhill walking in order to gain the propulsion for lifting thebody up the incline for foot clearance.
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