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Production of dehydrated fuel ethanol by pressure swing adsorption process in the pilot plant
Jun-Seong Jeong,Byung-Uk Jang,Young-Ran Kim,Gi-Wook Choi,Bong-Woo Chung 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.5
Fermented ethanol is gaining wide popularity as a car fuel additive. The pressure swing adsorption (PSA) process is attractive for the dehydration of bioethanol on the industrial scale, since its energy consumption is low and it is capable of producing a very pure product. 3 Å zeolite possesses micro-pores which, due to their small size, adsorb water molecules but not ethanol molecules. In this work, up to 2 kL/day of dehydrated ethanol (99.5% by weight) was successfully produced with 3 Å zeolite by the pressure swing adsorption process. The cycles of the PSA process were operated under the following variables: feed flow rate (27-62 N㎥/hr of 93.2% by weight), purge/feed ratio (30-24%), adsorption temperature (130-140℃) and adsorption pressure (1.2 atm).
Crystal structure of xenotropic murine leukaemia virus-related virus (XMRV) ribonuclease H
Kim, Ju ,Hee,Kang, Sunghyun,Jung, Suk-Kyeong,Yu, Keum ,Ran,Chung, Sang ,J.,Chung, Bong ,Hyun,Erikson, Raymond ,L.,Kim, Bo ,Yeon,Kim, Seung ,Jun Portland Press Ltd. 2012 Bioscience reports Vol.32 No.5
<P>RNase H (retroviral ribonuclease H) cleaves the phosphate backbone of the RNA template within an RNA/DNA hybrid to complete the synthesis of double-stranded viral DNA. In the present study we have determined the complete structure of the RNase H domain from XMRV (xenotropic murine leukaemia virus-related virus) RT (reverse transcriptase). The basic protrusion motif of the XMRV RNase H domain is folded as a short helix and an adjacent highly bent loop. Structural superposition and subsequent mutagenesis experiments suggest that the basic protrusion motif plays a role in direct binding to the major groove in RNA/DNA hybrid, as well as in establishing the co-ordination among modules in RT necessary for proper function.</P>
Kim, Min Jung,Lim, Chaeyun,Lee, Jun Young,Im, Kyung Ran,Yoon, Kyung-Sup,Song, Joon Myong SAGE Publications 2013 Journal of biomolecular screening Vol.18 No.4
<P>There is a growing interest in alopecia prevention strategies, as the number of alopecia patients is increasing. We examine the efficacy of herbal medicine for hair growth promotion/hair loss inhibition in two cell lines via Western blot and high-content screening (HCS). Nine herbal extracts were obtained from three different herbal medicine mixtures using 3 different extraction methods. Five target proteins—IGF-1 (insulin-like growth factor–1), TGF-β2 (transforming growth factor–β2), VEGF (vascular endothelial growth factor), DKK-1 (Dickkopf-1), and Wnt5α—were observed for the assessment of hair growth promotion/hair loss inhibition efficacy. The efficacies of nine extracts were compared with minoxidil as control. Efficacy was defined as a rise in the expression levels of IGF-1, VEGF, and Wnt5α but a decrease in DKK-1 and TGF-β2. Intracellular concurrent imaging of these proteins was successfully achieved using HCS, employing visible-to-near infrared probing based on quantum-antibody conjugates and hypermulticolor imaging.</P>
Catechins activate muscle stem cells by Myf5 induction and stimulate muscle regeneration
Kim, A Rum,Kim, Kyung Min,Byun, Mi Ran,Hwang, Jun-Ha,Park, Jung Il,Oh, Ho Taek,Kim, Hyo Kyeong,Jeong, Mi Gyeong,Hwang, Eun Sook,Hong, Jeong-Ho Elsevier 2017 Biochemical and biophysical research communication Vol. No.
<P><B>Abstract</B></P> <P>Muscle weakness is one of the most common symptoms in aged individuals and increases risk of mortality. Thus, maintenance of muscle mass is important for inhibiting aging. In this study, we investigated the effect of catechins, polyphenol compounds in green tea, on muscle regeneration. We found that (−)-epicatechin gallate <B>(</B>ECG) and (−)-epigallocatechin-3-gallate (EGCG) activate satellite cells by induction of Myf5 transcription factors. For satellite cell activation, Akt kinase was significantly induced after ECG treatment and ECG-induced satellite cell activation was blocked in the presence of Akt inhibitor. ECG also promotes myogenic differentiation through the induction of myogenic markers, including Myogenin and Muscle creatine kinase (MCK), in satellite and C2C12 myoblast cells. Finally, EGCG administration to mice significantly increased muscle fiber size for regeneration. Taken together, the results suggest that catechins stimulate muscle stem cell activation and differentiation for muscle regeneration.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Catechins stimulate muscle regeneration after muscle damage. </LI> <LI> Catechins activate muscle satellite cells through Akt activation and Myf5 induction. </LI> <LI> Catechins stimulate myogenesis through the induction of Myogenin and MCK. </LI> </UL> </P>
Kim, Su Ran,Lee, Hye Won,Jun, Ji Hee,Ko, Byoung-Seob KOREAN PHARMACOPUNCTURE INSTITUTE 2017 Journal of pharmacopuncture Vol.20 No.1
Objectives: Gan Mai Da Zao (GMDZ) decoction is widely used for the treatment of various diseases of the internal organ and of the central nervous system. The aim of this study is to investigate the effects of GMDZ decoction on neuropsychiatric disorders in an animal model. Methods: We searched seven databases for randomized animal studies published until April 2015: Pubmed, four Korean databases (DBpia, Oriental Medicine Advanced Searching Integrated System, Korean Studies Information Service System, and Research Information Sharing Service), and one Chinese database (China National Knowledge Infrastructure). The randomized animal studies were included if the effects of GMDZ decoction were tested on neuropsychiatric disorders. All articles were read in full and extracted predefined criteria by two independent reviewers. Results: From a total of 258 hits, six randomized controlled animal studies were included. Five studies used a Sprague Dawley rat model for acute psychological stress, post-traumatic stress disorders, and unpredictable mild stress depression whereas one study used a Kunming mouse model for prenatal depression. The results of the studies showed that GMDZ decoction improved the related outcomes. Conclusion: Regardless of the dose and concentration used, GMDZ decoction significantly improved neuropsychiatric disease-related outcomes in animal models. However, additional systematic and extensive studies should be conducted to establish a strong conclusion.
Fumigant Toxicity of Plant Essential Oils to Camp corticalis (Diptera: Cecidomyiidae)
Jun-Ran Kim,Haribalan Perumalsamy,Bong ki Son,Young-Joon Ahn 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.05
The toxicity of 102 plant essential oils against third instars of cecidomyiid gall midge, Camptomyia corticalis, was examined using a vapor-phase mortality bioassay. Results were compared with that of a conventional insecticide dichlorvos. Based on 24 h LC50 values, all essential oils were less toxic than dichlorvos (LC50, 0.027 mg/cm3). The LC50 of caraway seed, armoise, sage (Clary), oreganum, lemongrass, niaouli, spearmint, cassia special, sage (Dalmatian), thyme red, bay, garlic, and pennyroyal essential oil is between 0.55–0.60 mg/cm3. The LC50 of cassia pure, thyme white, cassia redistilled, star anise, peppermint, wintergreen, cinnamon bark, majoram, chamomile romon, eucalyptus, rosemary, cedar wood, pimento berry, savory (summer), lavender, and coriander oil is between 0.61–0.99 mg/cm3. All other essential oils tested exhibited low toxicity to the cecidomyiid larvae (LC50,>0.99 mg/cm3). The active principles of active essential oils were identified by GC-MS analysis. The major active principles are such as pulegone, thujone, camphor, 1,8-cineole, a-pinene, thymol, menthol. At a rate of 5 mg/cm3, pulegone, and thujone, exhibited 100% morality whereas camphor, 1,8-cineole, α-pinene, thymol and menthol showed 90% mortality at 15 mg/cm3. Global efforts to reduce the level of highly toxic synthetic insecticides in the agricultural environment justify further studies on the essential oils and their constituents described as potential insecticides for the control of the mushroom fly as fumigants with contact action.
Jun-Ran Kim,In-Hong Jeong,Sang-Guei Lee,Hyun Gwan Goh 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04
The acaricidal activity of Asarum heterotropoides root-derived principles, methyleugenol, safrole, 3-carene, α-asarone, pentadecane and A. heterotropoides root steam distillate constituents was tested against poultry red mites Dermanyssus gallinae (De Geer). All active principles were identified by spectroscopic analysis. Results were compared with those of two conventional acaricides, benzyl benzoate and N,N-diethyl-3-methylbenzamide (DEET). Methyleugenol (24 h LC50 = 0.57 μg/cm2) and safrole (24 h LC50 = 8.54 μg/cm2) were the most toxic compounds toward D. gallinae, followed by 3,4,5-trimethoxytoluene, 3,5-dimethoxytoluene, estragole, α-terpineol, verbenone, eucarvone, linalool, and terpinen-4-ol (LC50 = 15.65–27.88 μg/cm2). Methyleugenol was 16.7× and 11.0× more toxic than benzyl benzoate (LC50 = 9.52 μg/cm2) and DEET (LC50 = 6.28 μg/cm2), respectively; safrole was 1.1× and 0.73× more toxic. Asarum heterotropoides root-derived materials, particularly methyleugenol and safrole, merit further study as potential acaricides. Global efforts to reduce the level of highly toxic synthetic acaricides in indoor environments justify further studies on A. heterotropoides root extract and steam distillate preparations containing the active constituents described as potential contact-action fumigants for the control of mites.