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Jeongtae Kim,Meejung Ahn,Yuna Choi,Poornima Ekanayake,Gi‑Ok Kim,Taekyun Shin 경희대학교 융합한의과학연구소 2020 Oriental Pharmacy and Experimental Medicine Vol.20 No.1
We evaluated the antifibrotic effects of fermented black radish (FBR) on carbon tetrachloride (CCl4)-induced chronic liver injury in rats. Serum biochemical analysis indicated that FBR treatment attenuated the upregulation of alanine aminotransferase and aspartate aminotransferase. Moreover, Sirius red staining and histopathological examination revealed decreased fibrosis and inflammation in FBR-treated rats compared with CCl4 + vehicle-treated rats. Western blot analysis of alpha-smooth muscle actin expression levels confirmed the downregulation of fibrosis in the FBR treatment group compared with the CCl4 + vehicle treatment group. These results suggest that FBR treatment suppressed liver fibrosis in CCl4-exposed rats.
Kim, Jeongtae,Song, Yowook,Kim, Dong Woo,Fiaz, Muhammad,Kwon, Chan Ho The Korean Society of Grassland and Forage Science 2017 한국초지조사료학회지 Vol.37 No.1
In attempt to avoid crop damage through wild bird's picking, this study was designed with aim to evaluate several pre-sowing soybean seed coatings for optimum yield in corn-soybean mixed forage. It was investigated under four cropping treatments, viz. 1) corn sole, 2) corn mixed with soybean without any coating, 3) corn with iron coated soybean and 4) corn with thiram coated soybean. Each treatment had three replicates and corn sole was control treatment. Pioneer (P1184) and crossbred ($PI483463{\times}Hutcheson$) seeds were used for corn and soybean, respectively. The trial was conducted under randomized block design from $5^{th}$ June to $23^{rd}$ September, 2015. Data were an alyzed through ANOVA technique using SAS9.1.3 software. Results depicted that survivability of soybean against wild birds damage was found better (p<0.05) in thiram coating which was higher than iron coating and control treatment but later on thiram coating had adverse effects on subsequent growth of soybean plants. Corn stalk height was decreased (p<0.05) in thiram coating, whereas corn ear height was reduced in iron coating treatment. Iron coating enhanced (p<0.05) height of soybean plant (p<0.05) better than that of thiram coating. Soybean seed coatings didn't influence dry matter yield and nutritive value in terms of total digestible nutrients yield in corn soybean mixed forage. Conclusively, although presowing thiram coating enhanced survivability of soybean plants against wild bird damage but had adverse effects on its subsequent growth. However, soybean seed coatings didn't influence yield and nutritive value of corn soybean intercropping forage.
Recent Advancements in Technologies to Detect Enterohaemorrhagic Escherichia coli Shiga Toxins
Kim Jeongtae,Lee Jun Bong,Park Jaewon,Koo Chiwan,Lee Moo-Seung 한국미생물·생명공학회 2023 Journal of microbiology and biotechnology Vol.33 No.5
Shiga toxin (Stxs)-producing enterohaemorrhagic Escherichia coli (EHEC) and Shigella dysenteriae serotype 1 are major causative agents of severe bloody diarrhea (known as hemorrhagic colitis) and hemolytic uremic syndrome (HUS) associated with extraintestinal complications such as acute renal failure and neurologic impairment in infected patients under 9 years of age. Extreme nephrotoxicity of Stxs in HUS patients is associated with severe outcomes, highlighting the need to develop technologies to detect low levels of the toxin in environmental or food samples. Currently, the conventional polymerase chain reaction (PCR) or immunoassay is the most broadly used assay to detect the toxin. However, these assays are laborious, time-consuming, and costly. More recently, numerous studies have described novel, highly sensitive, and portable methods for detecting Stxs from EHEC. To contextualize newly emerging Stxs detection methods, we briefly explain the basic principles of these methods, including lateral flow assays, optical detection, and electrical detection. We subsequently describe existing and newly emerging rapid detection technologies to identify and measure Stxs.
Lifetime Assessment for Oil-Paper Insulation using Thermal and Electrical Multiple Degradation
Jeongtae Kim,Woobin Kim,Hung-Sok Park,Ji-Won Kang 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
In this paper, in order to investigate the lifetime of oil-paper insulation, specimens were artificially aged with thermal and electrical multiple stresses. Accelerated ageing factors and equivalent operating years for each aging temperatures were derived from results of tensile strengths for the aged paper specimens. Also, the evaluation for the multi-stress aged specimens were carried out through the measurement of impulse breakdown voltage at high temperature of 85℃. The lifetimes of the oil-paper insulations were calculated with the value of 66.7 for 1.0 mm thickness specimens and 69.7 for 1.25 mm thickness specimens throughout the analysis of impulse BD voltages using equivalent operating years, which means that dielectric strengths would not be severely decreased until the mechanical lifetime limit. Therefore, for the lifetime evaluation of the oil-paper insulation, thermal aging would be considered as a dominant factor whereas electrical degradation would be less effective.
Kim, Jeongtae,Yoon, Ji-Sub,Choi, Sang-Won The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.5
<P>In this study, in order to analyze the lifetime for flexible cables used in portable electric machines, artificial accelerating aging was carried out for VCT(Vinyl Cab-Tire) cables in consideration of thermal, mechanical and electrical multiple-stresses. Accelerated aging factors were calculated with aging temperatures based on the Arrhenius relationship. Through Weibull statistical analysis in the AC breakdown voltages for aged cables after low-temperature mechanical tests, it was analyzed that AC breakdown voltages were proportional to the elongation rates and 19kV of the scale parameter in Weibull analysis was suggested as limit value of lifetime. Using this criterion, it was deduced that the lifetimes with thermal and mechanical multiple-stresses for 70 degrees C, 50 degrees C and 40 degrees C continuous operation were calculated to be 3.3 years, 9.9 years and 15.7 years respectively. Based on these analysis procedure, it is possible to suggest the lifetime assessment technique with multiple stresses for low voltage cables.</P>
Lifetime Assessment for Oil-Paper Insulation using Thermal and Electrical Multiple Degradation
Kim, Jeongtae,Kim, Woobin,Park, Hung-Sok,Kang, Ji-Won The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
In this paper, in order to investigate the lifetime of oil-paper insulation, specimens were artificially aged with thermal and electrical multiple stresses. Accelerated ageing factors and equivalent operating years for each aging temperatures were derived from results of tensile strengths for the aged paper specimens. Also, the evaluation for the multi-stress aged specimens were carried out through the measurement of impulse breakdown voltage at high temperature of $85^{\circ}C$. The lifetimes of the oil-paper insulations were calculated with the value of 66.7 for 1.0 mm thickness specimens and 69.7 for 1.25 mm thickness specimens throughout the analysis of impulse BD voltages using equivalent operating years, which means that dielectric strengths would not be severely decreased until the mechanical lifetime limit. Therefore, for the lifetime evaluation of the oil-paper insulation, thermal aging would be considered as a dominant factor whereas electrical degradation would be less effective.
Jeongtae Kim,Jiyoon Chun,Meejung Ahn,Kyungsook Jung,Changjong Moon,Tae-Kyun Shin 대한해부학회 2022 Anatomy & Cell Biology Vol.55 No.1
Experimental autoimmune uveitis (EAU), an animal model of human uveitis, is characterized by infiltration of autoimmune T cells in the uvea as well as in the retina of susceptible animals. EAU is induced by the immunization of uveitogenic antigens, including either retinal soluble-antigen or interphotoreceptor retinoid-binding proteins, in Lewis rats. The pathogenesis of EAU in rats involves the proliferation of autoimmune T cells in peripheral lymphoid tissues and breakdown of the blood-retinal barrier, primarily in the uvea and retina, finally inducing visual dysfunction. In this review, we describe recent EAU studies to facilitate the design of a therapeutic strategy through the interruption of uveitogenic factors during the course of EAU, which will be helpful for controlling human uveitis.