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Effects of irradiation source and dose level on quality characteristics of processed meat products
Ham, Y.K.,Kim, H.W.,Hwang, K.E.,Song, D.H.,Kim, Y.J.,Choi, Y.S.,Song, B.S.,Park, J.H.,Kim, C.J. Pergamon 2017 Radiation physics and chemistry Vol.130 No.-
<P>The effect of irradiation source (gamma-ray, electron-beam, and X-ray) and dose levels on the physicochemical, organoleptic and microbial properties of cooked beef patties and pork sausages was studied, during 10 days of storage at 30 +/- 1 degrees C. The processed meat, products were irradiated at 0, 2.5, 5, 7.5, and 10 kGy by three different irradiation sources. The pH of cooked beef patties and pork sausages was unaffected by irradiation sources or their doses. The redness of beef patties linearly decreased with increasing dose level (P < 0.05), obviously by e-beam irradiation compared to gamma-ray and X-ray (P < 0.05). The redness of pork sausages was increased by gamma-ray irradiation, whereas it decreased by e-beam irradiation depending on absorbed dose level. No significant changes in overall acceptability were observed for pork sausages regardless of irradiation source (P> 0.05), while gamma-ray irradiated beef patties showed significantly decreased overall acceptability in a dose-dependent manner (P < 0.05). Lipid oxidation of samples was accelerated by irradiation depending on irradiation sources and dose levels during storage at 30 degrees C. E-beam reduced total aerobic bacteria of beef patties more effectively, while gamma-ray considerably decreased microbes in pork sausages as irradiation dose increased. The results of this study indicate that quality attributes of meat products, in particular color, lipid oxidation, and microbial properties are significantly influenced by the irradiation sources. (C) 2016 Published by Elsevier Ltd.</P>
Lee, J.Y.,Lim, D.H.,Chae, J.E.,Choi, J.,Kim, B.H.,Lee, S.Y.,Yoon, C.W.,Nam, S.Y.,Jang, J.H.,Henkensmeier, D.,Yoo, S.J.,Kim, J.Y.,Kim, H.J.,Ham, H.C. Elsevier Scientific Pub. Co 2016 Journal of membrane science Vol.514 No.-
Poly(dibenzylated benzimidazolium) bromides (Bz-PBI-Br) were converted successfully to OH<SUP>-</SUP> ion conducting poly(dibenzylated benzimidazolium) hydroxides (Bz-PBI-hydroxides) by the treatment of KOH. The Bz-PBI-hydroxides obtained in this study showed an excellent alkali tolerance compared to previously synthesized poly(dimethylated benzimidazolium) hydroxides (Me-PBI-hydroxides). According to <SUP>1</SUP>H-NMR analysis, Me-PBI-hydroxides were decomposed during KOH treatment. In order to find out the reason, density functional theory (DFT) calculations of two benzimidazolium structures, e.g., dimethylated benzimidazolium (Me-BI<SUP>+</SUP>) and dibenzylated benzimidazolium (Bz-BI<SUP>+</SUP>), were performed. Bz-BI<SUP>+</SUP> showed lower electron affinity and OH<SUP>-</SUP>-binding energies at the C2 position of the benzimidazolium ring than Me-BI<SUP>+</SUP>. These DFT results strongly confirm that Bz-BI<SUP>+</SUP> is less vulnerable to an OH<SUP>-</SUP> attack than Me-BI<SUP>+</SUP>; this contributes to the enhanced stability and OH<SUP>-</SUP> ion conductivity of the Bz-PBI-hydroxides.
Kang, E. S.,Hwang, J. S.,Ham, S. A.,Park, M. H.,Kim, G. H.,Paek, K. S.,Yoo, T.,Lee, W. J.,Kang, K. R.,Lee, J. H.,Choi, Y. J.,Seo, H. G. Informa Healthcare 2014 Free radical research Vol.48 No.2
<P>The omega-6 fatty acid derivative 15-Deoxy-Δ<SUP>12,14</SUP>-prostaglandin J<SUB>2</SUB> (15d-PGJ<SUB>2</SUB>) is believed to play a role in cellular protection against oxidative stress in diverse cell systems. However, the cellular mechanisms by which protection is afforded by 15d-PGJ<SUB>2</SUB> are not fully elucidated in vascular smooth muscle cells (VSMCs). In this study, we report the finding that 15d-PGJ<SUB>2</SUB> elicited a time and concentration- dependent increase in aldose reductase (AR) expression. This induction was independent of the activation of peroxisome proliferator- activated receptor γ. Inhibition of phosphatidylinositol 3-kinase (PI3K) significantly suppressed the increase in expression and promoter activity of AR induced by 15d-PGJ<SUB>2</SUB>. Luciferase reporter assays demonstrated that 15d-PGJ<SUB>2</SUB> targets the multiple stress response regions comprising the antioxidant response element in the promoter of the AR gene. 15d-PGJ<SUB>2</SUB>-mediated induction of AR promoter activity was potentiated in the presence of nuclear factor-erythroid 2-related factor 2 (Nrf2), but not in cells expressing dominant negative Nrf2. Cells treated with 15d-PGJ<SUB>2</SUB> were resistant to oxidant-induced apoptotic cell death by inhibiting production of reactive oxygen species. These effects were significantly attenuated in the presence of an AR inhibitor or small interfering RNA against AR, indicating that AR plays a protective role against oxidative injury. Taken together, these findings demonstrate that activation of PI3K by 15d-PGJ<SUB>2</SUB> increases the expression of AR through Nrf2, and increased AR activity may function as an important cellular response against oxidative injury.</P>
김정자,함윤애,강지용,성낙응 梨花女子大學校 醫科大學 醫科學硏究所 1978 EMJ (Ewha medical journal) Vol.1 No.1
Total cholesterol content of fishes and shellfishes, which bought in the local market, was estimated in part (head, muscle, skin, egg, and roe). and also, the general analytical data(water, protein, fat, and ash) were examined in the parts. The results of cholesterol content are as follows; 1) In the fresh water fishes, the cholesterol content was highest in trout and watereel. 2) In the marine fishes, it was high in makerel, Spanish makerel, horse makerel, and hickory sard and low in sea-cucumber and thormbock stingray. 3) Cholesterol content of the parts in both fresh water fishes and marine fishes was highest in roe, and the next egg, skin, head, and muscle in the ordet named. 4) Cholesterol content of the shell fishes was 100mg∼200mg/100g. 5) Generally, the cholesterol content also was high in the sample that fat content was high.
Kim, J.H.,Jeun, E.J.,Hong, C.P.,Kim, S.H.,Jang, M.S.,Lee, E.J.,Moon, S.J.,Yun, C.H.,Im, S.H.,Jeong, S.G.,Park, B.Y.,Kim, K.T.,Seoh, J.Y.,Kim, Y.K.,Oh, S.J.,Ham, J.S.,Yang, B.G.,Jang, M.H. Mosby 2016 The journal of allergy and clinical immunology Vol.137 No.2
<P>Background: The incidence of food allergies has increased dramatically during the last decade. Recently, probiotics have been studied for the prevention and treatment of allergic disease. Objective: We examined whether Bifidobacterium longum KACC 91563 and Enterococcus faecalis KACC 91532 have the capacity to suppress food allergies. Methods: B longum KACC 91563 and E faecalis KACC 91532 were administered to BALB/c wild-type mice, in which food allergy was induced by using ovalbumin and alum. Food allergy symptoms and various immune responses were assessed. Results: B longum KACC 91563, but not E faecalis KACC 91532, alleviated food allergy symptoms. Extracellular vesicles of B longum KACC 91563 bound specifically tomast cells and induced apoptosis without affecting T-cell immune responses. Furthermore, injection of family 5 extracellular solute-binding protein, a main component of extracellular vesicles, into micemarkedly reduced the occurrence of diarrhea in a mouse food allergy model. Conclusion: B longum KACC 91563 induces apoptosis of mast cells specifically and alleviates food allergy symptoms. Accordingly, B longum KACC 91563 and family 5 extracellular solute-binding protein exhibit potential as therapeutic approaches for food allergies.</P>
Ham, J.S.,In, Y.M.,Jeong, S.G.,Kim, J.G.,Lee, E.H.,Kim, H.S.,Yoon, S.K.,Lee, B.H. Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.7
This study was carried out to obtain conjugated linoleic acid (CLA) producing lactic acid bacteria for further study on the enzymes related to the production of CLA which has gained considerable attention and on the development as a probiotic culture. Total 34 lactic acid bacteria were isolated from 19 feces samples of healthy babies. CLA forming ability was measured spectrophotometrically by the modification of linoleate 12-cis, 11-trans-isomerase activity measuring method, and CLA of the cultures were extracted, methylated, and examined by HPLC analysis. CLA methyl ester of only one culture showing the highest value of CLA forming ability could be detected by HPLC analysis. The culture was found to be Gram positive, rods and catalase negative. It grows at $45^{\circ}C$ but not at $15^{\circ}C$, and was identified to be Lactobacillus fermentum on the basis of the biochemical characteristics and the utilization of substrates. These results provide an efficient experimental method to screen CLA producing lactic acid bacteria.
Lee, J.,Choi, S.,Kang, J.,Won, E.,Tae, W.S.,Lee, M.S.,Ham, B.J. Elsevier/North Holland Biomedical Press 2017 Psychiatry research, Neuroimaging Vol.269 No.-
Bipolar I disorder (BD-I) is often misdiagnosed, leading to inadequate treatment and significant disability along with reduced quality of life. Recent neural models suggest that the reward circuitry is affected in bipolar disorder. The purpose of the present study was to identify structural abnormalities in the brain reward-processing neural circuitry among patients with BD-I. 21 patients with BD-I and 21 healthy controls (HC) participated in this study. Structural magnetic resonance imaging was performed. Region-of-interest (ROI) voxel-based morphometry analysis was applied to assess the presence of structural changes between the BD-I patient group and the control group. The results of the reward circuitry ROI analysis revealed lower gray matter volumes in the left ventromedial prefrontal cortex (VMPFC), left dorsomedial prefrontal cortex (DMPFC), and left ventrolateral prefrontal cortex (VLPFC) in patients with BD-I compared to HC. Our results suggest that abnormalities in the brain reward-processing neural circuitry, especially those in the left VMPFC, left DMPFC, and left VLPFC, may play an important role in the pathophysiology of BD-I.