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Improved Oxidative Stability of Enhanced Pork Loins Using Red Perilla Extract
Da Gyeom Lee,Juri Lee,Kyung Jo,Cheol Woo Lee,Hyun Jung Lee,Cheorun Jo,Samooel Jung 한국축산식품학회 2017 한국축산식품학회지 Vol.37 No.6
Enhanced meat is defined as fresh meat that has been minimally processed to improve quality and consistency. The present work investigated the quality of enhanced pork loins manufactured with the extract of red perilla leaves (ERP). ERP was prepared by the aqueous extraction of red perilla leaves followed by lyophilization. Enhanced pork loins were produced by injecting brine (15% v/w). The treatments consisted of a control (brine containing no ERP), ERP 0.2 (brine containing ERP at a concentration of 2 g/kg of pork loin), and ERP 0.4 (brine containing ERP at a concentration of 4 g/kg of pork loin). The enhanced pork loins were stored at 4°C for 7 d, and its quality parameters were investigated. Addition of ERP decreased the L*-value and increased the a*- and b*-values of enhanced pork loins compared to those of the control group at all storage intervals (p<0.05). A significantly lower pH than that of the control was found in ERP 0.4 after 7 d of storage. The malondialdehyde contents of the cooked pork loins were significantly lower in ERP 0.2 and ERP 0.4 than in those of the control after 4 and 7 d of storage (p<0.05). While ERP 0.4 received relatively low scores in taste, flavor, and overall acceptability of the cooked pork loins (p<0.05), no significant differences were found between the control and ERP 0.2. Enhanced pork loins can be produced using ERP to improve their oxidative stability.
( Da Jung Jo ),( In-hye Kang ),( Ji Hwoon Baek ),( Min Jae Gwak ),( Sang Jun Lee ),( Min Kyung Shin ) 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.2
Background: Melasma is an acquired type of hyperpigmentation that is characterized by the appearance of scattered light- to dark-brown macules and patches on the face. Recently, several lasers have been proposed as treatment options for melasma. In particular, the picosecond alexandrite laser is an ideal laser for selective photothermal melanolysis. Objectives: The aim of our study was to compare the effectiveness in melanolysis of a single treatment of the picosecond alexandrite laser with that of the Q-switched Nd:YAG laser using reflectance confocal microscopy imaging of the melasma lesions. Methods: We performed a spilt-face study using the picosecond alexandrite laser and Q-switched Nd:YAG laser in eight patients with melasma. Both melasma lesions and surrounding normal skin were examined under reflectance confocal microscopy 1 and 24 hours after treatment. The melanin intensity of each skin layer was investigated. Results: At baseline, melasma has irregular melanin distribution and a higher melanin density than surrounding normal skin under reflectance confocal microscopy. After a single treatment with either the picosecond alexandrite laser or the Q-switched Nd:YAG laser, both melanin-induced reflectance and melanin index decreased. Conclusion: Our findings suggest that it is feasible to assess the distribution of melanin by reflectance confocal microscopy and observe the melanolysis in melasma lesion after laser treatment.
( Da Eun Kim ),( Hyeri Yang ),( Won Hee Jang ),( Kyoung Mi Jung ),( Miyoung Park ),( Jin Kyu Choi ),( Mi Sook Jung ),( Eun Young Jeon ),( Yong Heo ),( Kyung Wook Yeo ),( Ji Hoon Jo ),( Jung Eun Park ) 영남대학교 약품개발연구소 2016 영남대학교 약품개발연구소 연구업적집 Vol.26 No.-
In order for a novel test method to be applied for regulatory purposes, its reliability and relevance, I.e., reproducibility and predictive capacity, must be demonstrated, Here, we examine the predictive capacity of a novel non-radioisotopic local lymph node assay, LLNA:BrdU-FCM (5-bromo-2`-deoxyuridine-flow cytome-try), with a cutoff approach and inferential statistics as a prediction model. 22 reference substances in OECDTG429 were tested with a concurrent positive control. Hexylcinnamaldehyde 25%(PC), and the stimulation index(SI) representing the fold increase in lymph node cells over the vehicle control was obtained. The optimal cutoff SI(2.7≤cutoff<3.5), with respect to predictive capacity, was obtained by a receiver operating character-istic curve, which produced 90.9% accuracy for the 22 substances. To address the inter-test variability in respon-siveness, SI values standardized with PC were employed to obtain the optimal percentage cutoff(42.6≤Cutoff<57.3%of PC), which produced 86.4% accuracy. A test subastance may be diagnosed as a sensitizer if a statistically significant increase in Si is elicited. The parametric one-sided t-test and non-parametric Wilcoxon rank-sum test produced 77.3% accuracy. Similarly, a test substance could be defined as a sensitizer if the SI means of the vehicle control, and of the low, middle, and high concentrations were statistically significantly different, which was test-ed using ANOVA or Kruskal-Wallis, with post hoc analysis, Dunnett, or DSCF(Dwass-Steel-Critchlow-Fligner), respectively, depending on the equal variance test, producing 81.8% accuracy. The absolute SI-based cutoff approach produced the best predictive capacity, however the discordant decisions between prediction models need to be examined further.
ANNIHILATING PROPERTY OF ZERO-DIVISORS
Jung, Da Woon,Lee, Chang Ik,Lee, Yang,Nam, Sang Bok,Ryu, Sung Ju,Sung, Hyo Jin,Yun, Sang Jo Korean Mathematical Society 2021 대한수학회논문집 Vol.36 No.1
We discuss the condition that every nonzero right annihilator of an element contains a nonzero ideal, as a generalization of the insertion-of-factors-property. A ring with such condition is called right AP. We prove that a ring R is right AP if and only if Dn(R) is right AP for every n ≥ 2, where Dn(R) is the ring of n by n upper triangular matrices over R whose diagonals are equal. Properties of right AP rings are investigated in relation to nilradicals, prime factor rings and minimal order.
Prevalence of Latent Tuberculosis Infection among Medical Students in South Korea
Jung, Da Ho,Jo, Kyung-Wook,Shim, Tae Sun The Korean Academy of Tuberculosis and Respiratory 2012 Tuberculosis and Respiratory Diseases Vol.73 No.4
Background: We investigated the prevalence of latent tuberculosis infection (LTBI) among medical students in South Korea. Methods: Students from one medical school, who were in second- or third-year classes before clerkship course, were enrolled for three consecutive years in the study. A standard questionnaire was given to each participant, and tuberculin skin test (TST), QuantiFERON-TB GOLD In-Tube (QFT-GIT) assay, and chest radiography were performed. Results: A total of 153 participants were enrolled in the study. The mean age of the subjects was $21.9{\pm}0.9$ years, 105 (68.6%) were male, and 132 (86.3%) had been vaccinated with Bacille Calmette-Gu$\acute{e}$rin (BCG). Four students (2.6%) had a history of contact with tuberculosis (TB) patients during medical practice. No abnormal chest radiograph findings were found for any of the subjects. Of the 153 subjects, 23 (15.0%) tested positive for the TST, and 8 (5.2%) tested positive for the QFT-GIT. The agreement between the two tests was determined to be 0.34 using kappa coefficients. Of the four students who had a history of contact with TB patients, only one subject tested positive for both tests, and the other three students tested negative for both tests. Conclusion: A low prevalence of LTBI was found among medical students before clerkship course in South Korea.
GABA from reactive astrocytes impairs memory in mouse models of Alzheimer's disease
Jo, Seonmi,Yarishkin, Oleg,Hwang, Yu Jin,Chun, Ye Eun,Park, Mijeong,Woo, Dong Ho,Bae, Jin Young,Kim, Taekeun,Lee, Jaekwang,Chun, Heejung,Park, Hyun Jung,Lee, Da Yong,Hong, Jinpyo,Kim, Hye Yun,Oh, Soo- Nature Publishing Group, a division of Macmillan P 2014 Nature medicine Vol.20 No.8
In Alzheimer's disease (AD), memory impairment is the most prominent feature that afflicts patients and their families. Although reactive astrocytes have been observed around amyloid plaques since the disease was first described, their role in memory impairment has been poorly understood. Here, we show that reactive astrocytes aberrantly and abundantly produce the inhibitory gliotransmitter GABA by monoamine oxidase-B (Maob) and abnormally release GABA through the bestrophin 1 channel. In the dentate gyrus of mouse models of AD, the released GABA reduces spike probability of granule cells by acting on presynaptic GABA receptors. Suppressing GABA production or release from reactive astrocytes fully restores the impaired spike probability, synaptic plasticity, and learning and memory in the mice. In the postmortem brain of individuals with AD, astrocytic GABA and MAOB are significantly upregulated. We propose that selective inhibition of astrocytic GABA synthesis or release may serve as an effective therapeutic strategy for treating memory impairment in AD.
Da Hee Kang,Hanjoo Jo,Min-Jung Jung,Kyoung Hoon Kim,Young-Seak Lee 한국탄소학회 2018 Carbon Letters Vol.27 No.-
TiO2-doped activated carbon fibers(ACFs) were successfully prepared as capacitive deionization(CDI) electrode materials by facile ultrasonication-assisted process. ACFs were treated with titanium isopropoxide(TTIP) and isopropyl alcohol solutions of different concentrations and then calcinated by ultrasonication without heat-treatment. The results show that a certain amount of anatase TiO2 was present on the ACF surface. The specific capacitance of the TiO2-doped ACF electrode was remarkably improved(by 93.8% at scan rate of 50 mV s-1) over that of the untreated ACF electrode, despite decreases in the specific surface area and total pore volume upon TiO2 doping. From the CDI experiments, the salt adsorption capacity and charge efficiency of the sample with TTIP percent concentration of 15% were found to considerably increase by 71.9 and 57.1%, respectively. These increases are attributed to the improved wettability of the electrode, which increases the number of surface active sites and facilitates salt ion diffusion in the ACF pores. Additionally, the Ti-OH groups of TiO2 act as electrosorption sites, which increases the electrosorption capacity.