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Principal protocols for the processing of cultured meat
( Seung Yun Lee ),( Hea Jin Kang ),( Da Young Lee ),( Ji Hyeop Kang ),( Sivasubramanian Ramani ),( Sungkwon Park ),( Sun Jin Hur ) 한국축산학회(구 한국동물자원과학회) 2021 한국축산학회지 Vol.63 No.4
The purpose of this study was to establish a basic principal procedure for the processing of cultured meat. The first stage involved isolating satellite cells from the desired muscle of an animal using enzymatic digestion (i.e., by using proteases, collagenases, and pronases). The second stage involved culturing the isolated muscle satellite cells in a growth medium containing fetal bovine serum and penicillin/streptomycin with growth factors for an optimal period of time. The second stage involved a basic method for the isolated muscle cells to proliferate while sub-culturing to further induce differentiation in gelatin-coated culture dishes with the general culture medium. The third stage involved the induction of differentiation of muscle satellite cells or formation of myotubes using myogenic medium. Lastly, the fourth stage involved the identification of cell differentiation or myotube formation (myogenesis) using fluorescent dyes. Moreover, the principle of these protocols can be applied to perform primary culture of animal cells. This study will assist beginners with the technical aspects of culturing meat (isolation, cultivation, and differentiation of muscle satellite cells as well as identification of myotube formation for myogenesis).
Methods for improving meat protein digestibility in older adults
Seung Yun Lee,Ji Hyeop Kang,Da Young Lee,정재원,김재현,문성실,허선진 한국축산학회 2023 한국축산학회지 Vol.65 No.1
This review explores the factors that improve meat protein digestibility and applies the findings to the development of home meal replacements with improved protein digestion rates in older adults. Various methods improve the digestion rate of proteins, such as heat, ultrasound, high pressure, or pulse electric field. In addition, probiotics aid in protein digestion by improving the function of digestive organs and secreting enzymes. Plant-derived proteases, such as papain, bromelain, ficin, actinidin, or zingibain, can also improve the protein digestion rate; however, the digestion rate is dependent on the plant enzyme used and protein characteristics. Sous vide processing improves the rate and extent of protein digestibility, but the protein digestion rate decreases with increasing temperature and heating time. Ultrasound, high pressure, or pulsed electric field treatments degrade the protein structure and increase the proteolytic enzyme contact area to improve the protein digestion rate.
( Seung-hyeop Nam ),( Chi-heum Cho ),( Sang-hoon Kwon ),( So-jin Shin ),( Tae-kyu Jang ),( Hye-won Chung ),( Seung-mee Lee ) 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
Objective: To compare the operative outcomes of patients undergoing either robotic (RH) or laparoscopic single-site hysterectomy (LH) in benign gynecological diseases. Methods: This is a retrospective study comparing perioperative outcomes of RH and LH in benign gynecological diseases including leiomyoma, adenomyosis, carcinoma in situ of cervix and endometrial hyperplasia. Patient demographic data and operative data were abstracted from the electronic charts. Parameters for comparison included total operation time, postoperative hospital stay, conversion and complication. Results: One hundred patients underwent LH between December 2011 and April 2013 and three hundreds patients underwent RH February 2014 to August 2017 at Keimyung University, Daegu, Korea. No significant differences were found in terms of age, body mass index (BMI) and uterus weight. Operative time was similar: 98.3 minutes in RH and 80 in LH. Estimated blood loss was also similar: 100ml in both groups. However, there were 2 cases of conversion in LH when there was no case of conversion in RH. Postoperative hospital stay was 2.8 days in RH and 3 days in LH. No intraoperative complications occurred in both groups. Postoperative complications were 0.65% in RH and 4.9% in LH. Conclusion: This single center experience presents that RH is safe and feasible surgical approach in benign gynecological diseases with comparable outcomes while RH overcomes technical limitations of LH.
Analysis of in vitro digestion using human gut microbiota in adult and elderly individuals
Seung Yun Lee,Da Young Lee,Ji Hyeop Kang,Jae Won Jeong,Dong Hoon Oh,Hyun Woo Kim,Jae Hyeon Kim,Sun Jin Hur 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
In vitro human digestion models are widely used to determine the digestibility of bioactive substances and to perform drug delivery analyses. To develop the most accurate in vitro human digestion model reported to date, we simulated all digestion conditions, including pH and digestion time, with changes in the amount of digestive enzymes, motility, and proportion of human gut microbiota in adult and elderly individuals. Using this newly developed model, the digestibility of bioactive materials between adult and elderly individuals. This was demonstrated through an experiment comparing the digestibility of different types of emulsified vitamin E between adult and elderly individuals. The digestibility of vitamin E emulsified by lard was found to be significantly different between adults and the elderly. Therefore, it can be concluded that this protocol provides a novel method for measuring in vitro human digestion to compare differences in drug delivery between adult and elderly individuals. In addition, this study can help to improve our understanding of the in vitro human digestion system for adults and the elderly.
Overview of the status of the development of antiviral drugs for COVID-19
Seung Yun Lee(Seung Yun Lee),Ji Hyeop Kang(Ji Hyeop Kang),Hea Jin Kang(Hea Jin Kang),Sun Jin Hur(Sun Jin Hur) 한국축산식품학회 2020 Food and Life Vol.2020 No.2
In this study, we surveyed worldwide media reports and research papers on the development of vaccines and antiviral drugs for COVID-19 treatment published over the past few months. We found that more studies were being conducted on the use of already approved drugs (remdesivir, lopinavir/ritonavir, chloroquine, niclosamide, and ivermectin) as new COVID-19 treatments, than on the development of new antiviral drugs. This could be due to the urgent need for drug development. We found that till date, there seem to be no results on current or future COVID-19 vaccine development. However, media reports showed that numerous companies have invested in vaccine development and some clinical trials are already underway (mostly in phase I–II). According to the results of our survey, the drugs that have been previously approved to treat other diseases have not yet been found to be very effective in treating COVID-19 patients; however, remdesivir is the most promising drug. Due to the pandemic situation, the number of patients participating in these clinical trials, compared to that in other previous clinical studies, is small. Therefore, due to the low reliability of the findings, additional experiments must be continued.
이상협(Sang-Hyeop Lee),양동호(Dong-Ho Yang),차승환(Seung-Whan Cha),곽진(Jin Kwak),이종찬(Jong-Chan Lee),이영식(Young-Sik Lee) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.8
This study is to evaluate the structural stability of heavy duty structure of the Complex CNC automatic lathe. The analysis conditions were analyzed by applying the weight and load of the part itself and then applying the weight of the upper assembly unit. As a result of the structural analysis, the values of stress and strain are small and safety factor is high, and as a result of the dynamic analysis, there will be no resonance outside the equipment driving area, so there will be no problem in equipment stability.