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Han Chae-Min,Shin Jong-Hee,Kim Sang-Kuk,Ryu Jung-Gi 한국작물학회 2023 Journal of crop science and biotechnology Vol.26 No.3
In this study, the nutritional and volatile compositions of several rice varieties classifed by endosperm type were analyzed. The rice analyzed were a hard type (Ilpum), three soft types (Seolgaeng, Hangaru, and Shingil), and a foury type (Baromi 2). The general composition, fatty acids, and amino acid content of each rice variety was determined. An electronic nose (e-nose) was used for the volatile analysis. Correlation analyses of the aroma patterns of the rice fours were conducted. The nutritional components contributing to changes in the aroma patterns of the rice after milling were investigated. Principal component analysis (PCA) confrmed that the aroma patterns of hard rice and foury rice before and after milling were signifcantly diferent, with these groups being clearly distinguished. Strong negative or positive correlations were observed between the metal oxide semiconductor (MOS) sensors that detect fragrance and four fatty acids (oleic, arachidic, gadoleic, and lignoceric acids). The results demonstrated that milled foury rice and soft rice showed diferent fragrance patterns despite both types of rice being used for four production. We also found that the primary nutritional components involved in the fragrance patterns were the four fatty acids.
Macrofungal Survey of the Tian Shan Mountains, Kyrgyzstan
( Sung Eun Cho ),( Jong Won Jo ),( Nam Kyu Kim ),( Young-nam Kwag ),( Sang-kuk Han ),( Kae Sun Chang ),( Seung Hwan Oh ),( Chang Sun Kim ) 한국균학회 2019 Mycobiology Vol.47 No.4
The Tian Shan mountain system is one of the large mountain ranges located in Central Asia. This region is globally recognized as mountain ranges, offering inestimable wealth in fauna and flora with significant biodiversity values. We surveyed macrofungal diversity of Tian Shan in Kyrgyzstan from 2016 to 2018. A collection of macrofungi was made, and these were subjected to sequence comparisons and phylogenetic analysis to ensure the identity of the collected macrofungi. Of those collected, 95 out of 100 specimens were successfully sequenced and compared with those of other related species retrieved from GenBank. The sequenced specimens were classified into 2 phyla, 8 orders, 24 families, 47 genera, and 57 species, based on current taxonomic concepts (combining morphology and phylogeny). To the best of our knowledge, this study provides the first well-documented checklist and phylogenetic analysis of macrofungi recovered from the Tian Shan mountains in Kyrgyzstan.
Sung-Kuk Kim,Sang Mi Han,Se Gun Kim,Hyo Young Kim,Hong Min Choi,Hye Jin Lee,Hyo Jung Moon,Soon Ok Woo 한국양봉학회 2022 韓國養蜂學會誌 Vol.37 No.4
To evaluate the physicochemical properties of beeswax produced by Apis mellifera Linnaeus (Am) and Apis cerana Fabricius (Ac), we collected and extracted pure beeswax from a bee hive. Detailed analysis of the physicochemical properties was then performed at the Korean Health Supplement Institute. We tested eight characteristics of the beeswax, including the levels of lead, arsenic, and mercury; melting point; acid value; saponification value; esterification value; and peroxide value of both Am and Ac beeswax. The levels of all heavy metals were below safety values, and melting points at 64.5°C were the same for the two beeswax samples. The esterification value of Ac beeswax (79.94) was higher than that of Am beeswax (73.73). However, the saponification, peroxide, and acid values of Am beeswax were higher than those of Ac beeswax. The saponification values for Ac and Am beeswax were 87.41 and 95.44, respectively. Notably, there was a significant difference in peroxide values and acid values between Ac and Am beeswax. The acid value and peroxide value of Am beeswax were more than 3-times and 45-times higher, respectively. Based on these results, beeswax can safely be used as a food additive.
Han, Chae-Min,Shin, Jong-Hee,Kim, Sang-Kuk,Kwon, Tae-Young,KIM, Jong-Sang The Korean Society of Crop Science 2018 한국작물학회지 Vol.63 No.3
This study was conducted to examine the influence of different transplanting dates on rice quality and starch properties (morphology and pasting properties) of rice varieties that may be used for the production of rice flour. Three rice flour varieties, 'Seolgaeng', 'Hangaru', and 'Milyang317', were transplanted on May 20, May 30, June 10, and June 20. The peak viscosity decreased with a delay in the transplanting date. However, the amylose content increased with a delay in the transplanting date, whereas that of protein decreased. Amylopectin short-branch chain content increased in the rice varieties that were transplanted on May 30. The morphology of the starch granule of the varieties was determined by SEM. No apparent external difference in the starch granules was observed for the different transplanting dates. These results indicate that the transplanting date influenced the amylopectin structure and pasting properties, which led to changes in the physicochemical characteristics of rice starch.
( Sang Kuk Han ),( Pil Cho Choi ),( Chong Kun Hong ),( Dong Hyuk Shin ),( Ji Ung Na ),( Hyun Jung Lee ),( Seong Youn Hwang ),( Jun Hwi Cho ) 대한응급의학회 2016 대한응급의학회지 Vol.27 No.4
Purpose: The aim of this study was to evaluate whether a simple verbal instruction regarding the rescuer gazing point can improve the depth of chest compressions (CCs) in the hands-only cardiopulmonary resuscitation (CPR). Methods: Participants who took part in basic life support training courses for lay-rescuers were eligible for inclusion in this prospective, single-blinded, cluster randomized controlled study. After the training courses, both the control and the intervention groups performed the hands-only CPR for two minutes on a manikin placed on the ground. Immediately prior to CCs, instructors provided the intervention group with brief verbal instructions to look in the opposite direction of the adducted arm after placing the heel of the hand on the mid-sternum. Results: One hundred and twenty-two participants (61 for each group) were enrolled in this study. The intervention group showed significantly deeper CCs than the control group (47.9±8.2 mm vs. 43±8.4 mm, p<0.01); however, there were no significant differences between the two groups in the quality of chest recoil, CC rate, or duty cycle of CCs. However, the frequency of incorrect hand position was higher in the intervention group when compared with the control group (10.3 [2.3-35.7] vs. 5.7 [0-33.0], p=0.036) Conclusion: Instructions to look in the opposite direction of the adducted arm during CCs improved the mean depth of CCs without significant adverse effects on the quality of recoil, CC rate, or duty cycle of CCs. However, the frequency of incorrect hand position was higher in the intervention group than the control group.