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Mycelial growth optimization of Armillaria sp. and its bioligical characteristics
Sung-I Woo,Youngae Park,Yeongseon Jang,Rhim Ryoo,Yeun Sug Jeong,Kang-Hyeon Ka 한국버섯학회 2018 버섯 Vol.22 No.1
Armillaria spp. have been used for edible and medicinal purposes in Asian countries for a long period of time. This study was carried out to obtain basic data for mycelial growth conditions of Armillaria spp. The growth of seven isolates of Armillaria species (A. gallica, A. mellea, and A. ostoyae) were tested with potato dextrose agar (PDA), Sabouraud dextrose agar (SDA), and malt extract agar (MEA). NIFoS 2319 and 2320 strains were selected because mycelium grew fast and showed fin density. All strains showed higher mycelial growth on PDA or SDA than MEA plates. The optimal temperature for mycelial growth was 25°C and the growth was good between 15°C and 25°C in all strains. Further study regarding their mycelial growth properties in various environmental conditions is needed to use this mushroom as applicable resource for food and pharmaceutical production.
Vascular Cell Responses against Oxidative Stress and its Application
Ryoo, Sung-Woo,Lee, Sang-Ki,Kim, Cuk-Seong,Jeon, Byeong-Hwa Biomedical Engineering Society for Circulation 2004 International Journal of Vascular Biomedical Engin Vol.2 No.2
The history of studies in biology regarding reactive oxygen species (ROS) is approximately 40 years. During the initial 30 years, it appeared that these studies were mainly focused on the toxicity of ROS. However, recent studies have identified another action regarding oxidative signaling, other than toxicity of ROS. Basically, it is suggested that ROS are reactive, and degenerate to biomolecules such as DNA and proteins, leading to deterioration of cellular functions as an oxidative stress. On the other hand, recent studies have shown that ROS act as oxidative signaling in cells, resulting in various gene expressions. Recently ROS emerged as critical signaling molecules in cardiovascular research. Several studies over the past decade have shown that physiological effects of vasoactive factors are mediated by these reactive species and, conversely, that altered redox mechanisms are implicated in the occurrence of metabolic and cardiovascular diseases ROS is a collective term often used by scientist to include not only the oxygen radicals($O2^{-{\cdot}},\;{^{\cdot}}OH$), but also some non-radical derivatives of oxygen. These include hydrogen peroxide, hypochlorous acid (HOCl) and ozone (O3). The superoxide anion ($O2^{-{\cdot}}$) is formed by the univalent reduction of triplet-state molecular oxygen ($^3O_2$). Superoxide dismutase (SOD)s convert superoxide enzymically into hydrogen peroxide. In biological tissues superoxide can also be converted nonenzymically into the nonradical species hydrogen peroxide and singlet oxygen ($^1O_2$). In the presence of reduced transition metals (e.g., ferrous or cuprous ions), hydrogen peroxide can be converted into the highly reactive hydroxyl radical (${^{\cdot}}OH$). Alternatively, hydrogen peroxide may be converted into water by the enzymes catalase or glutathione peroxidase. In the glutathione peroxidase reaction glutathione is oxidized to glutathione disulfide, which can be converted back to glutathione by glutathione reductase in an NADPH-consuming process.
Ryoo, Hyun-woo,Kim, You-sung,Lee, Jung-hyun,Shin, Woon-sup,Myung, No-seung,Hong, Hun-Gi Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.5
A new approach to fabricate an enzyme electrode was described based on the immobilization of horseradish peroxidase (HRP) on dithiobis-N-succinimidyl propionate (DTSP) self-assembled monolayer (SAM) formed on gold-nanoparticles (Au-NPs) which were electrochemically deposited onto glassy carbon electrode (GCE) surface. The overall surface area and average size of Au-NPs could be controlled by varying deposition time and were examined by Field Emission-Scanning Electron Microscope (FE-SEM). The $O_2$ reduction capability of the surface demonstrated that Au-NPs were thermodynamically stable enough to stay on GCE surface. The immobilized HRP electrode based on Au-NPs/GCE presented faster, more stable and sensitive amperometric response in the reduction of hydrogen peroxide than a HRP immobilized on DTSP/gold plate electrode not containing Au-NPs. The effects of operating potential, mediator concentration, and pH of buffer electrolyte solution on the performance of the HRP biosensor were investigated. In the optimized experimental conditions, the HRP immobilized GCE incorporating smaller-sized Au-NPs showed higher electrocatalytic activity due to the high surface area to volume ratio of Au-NPs in the biosensor. The HRP electrode showed a linear response to $H_2O_2$ in the concentration range of 1.4 $\mu$M-3.1 mM. The apparent Michaelis-Menten constant ($K _M\; ^{app}$) determined for the immobilized HRP electrodes showed a trend to be decreased by decreasing size of Au-NPs electrodeposited onto GCE.
Woo, Ainieng,Min, Byung-Sun,Ryoo, Sung-Woo Korean Society for Biochemistry and Molecular Bion 2010 Experimental and molecular medicine Vol.42 No.7
Arginase competitively inhibits nitric oxide synthase (NOS) via use of the common substrate L-arginine. Arginase II has recently reported as a novel therapeutic target for the treatment of cardiovascular diseases such as atherosclerosis. Here, we demonstrate that piceatannol- 3'-O-${\beta}$-D-glucopyranoside (PG), a potent component of stilbenes, inhibits the activity of arginase I and II prepared from mouse liver and kidney lysates, respectively, in a dose-dependent manner. In human umbilical vein endothelial cells, incubation of PG markedly blocked arginase activity and increased NOx production, as measured by Griess assay. The PG effect was associated with increase of eNOS dimer ratio, although the protein levels of arginase II or eNOS were not changed. Furthermore, isolated mice aortic rings treated with PG showed inhibited arginase activity that resulted in increased nitric oxide (NO) production upto 78%, as measured using 4-amino-5-methylamino- 2',7'-difluorescein (DAF-FM) and a decreased superoxide anions up to 63%, as measured using dihydroethidine (DHE) in the intact endothelium. PG showed $IC_{50}$ value of 11.22 ${\mu}M$ and 11.06 ${\mu}M$ against arginase I and II, respectively. PG as an arginase inhibitor, therefore, represents a novel molecule for the therapy of cardiovascular diseases derived from endothelial dysfunction and may be used for the design of pharmaceutical compounds.
Systematic Review of Hominis Placenta Pharmacopuncture in English and Korean Literature
Ryoo, Dek-Woo,Kim, Hong-Guk,Kim, Sung-Jin,Baek, Seung-Won,Jeong, Seong-Mok,Yoon, Jin-Young,Lee, Chang-Hee,Goo, Bon-Hyuk,Kim, Min-Jeong,Park, Yeon-Cheol,Baek, Yong-Hyeon,Nam, Sang-Soo,Seo, Byung-Kwan Korean AcupunctureMoxibustion Medicine Society 2017 Korean Journal of Acupuncture Vol.34 No.4
Background: Hominis placenta (HP) is used in Korean medicine to tonify qi and blood, and enrich yin and tonify yang. HP has been reported to have therapeutic effects. Methods: A survey of international and Korean electronic databases was conducted using the search terms "hominis placenta pharmacopuncture" and "hominis placenta extract". The search was limited to material published up to May 31, 2017. Results: A total of 83 studies were included in this systematic review: 50 were clinical studies, 25 were basic studies, and 8 were other types of study. Among clinical studies, the most frequently treated disease groups were musculoskeletal diseases and nervous system diseases. In vitro studies were conducted mainly on anti-inflammatory, analgesic, and anti-cell necrosis models. Most of the in vivo studies were performed in rheumatoid arthritis or diabetic complications models. Conclusion: HP pharmacopuncture has effects in the treatment of various diseases. Further large-scale randomized controlled trials are needed to improve the level of evidence for HP pharmacopuncture. It would be helpful if future in vitro and in vivo studies could identify the mechanism of action of HP pharmacopuncture.
Ryoo, Soo-Ryoon,Lee, Jieon,Yeo, Jinah,Na, Hee-Kyung,Kim, Young-Kwan,Jang, Hongje,Lee, Jung Hyun,Han, Sang Woo,Lee, Younghoon,Kim, Vic Narry,Min, Dal-Hee American Chemical Society 2013 ACS NANO Vol.7 No.7
<P>MicroRNA (miRNA) is an important small RNA which regulates diverse gene expression at the post-transcriptional level. miRNAs are considered as important biomarkers since abnormal expression of specific miRNAs is associated with many diseases including cancer and diabetes. Therefore, it is important to develop biosensors to quantitatively detect miRNA expression levels. Here, we develop a nanosized graphene oxide (NGO) based miRNA sensor, which allows quantitative monitoring of target miRNA expression levels in living cells. The strategy is based on tight binding of NGO with peptide nucleic acid (PNA) probes, resulting in fluorescence quenching of the dye that is conjugated to the PNA, and subsequent recovery of the fluorescence upon addition of target miRNA. PNA as a probe for miRNA sensing offers many advantages including high sequence specificity, high loading capacity on the NGO surface compared to DNA and resistance against nuclease-mediated degradation. The present miRNA sensor allowed the detection of specific target miRNAs with the detection limit as low as ∼1 pM and the simultaneous monitoring of three different miRNAs in a living cell.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-7/nn401183s/production/images/medium/nn-2013-01183s_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn401183s'>ACS Electronic Supporting Info</A></P>
Constructing u‐City of Seoul by future foresight analysis
Woo, Jung‐,Hun,Kim, HyungSeok,Lim, Sang Boem,Kim, Jae‐,Jin,Lee, Jonghyun,Ryoo, Rina,Kim, Hansoo,Minh, Le Dinh John Wiley Sons, Ltd. 2011 Concurrency and computation Vol.23 No.10
<P><B>Abstract</B></P><P>AirScope is a micro‐scale modeling system as well as a micro‐scale air quality monitoring system, which comprises as a micro‐scale air quality management system. Importance of micro‐scale air monitoring is rising due to the concern about environment near residential places. Traditional monitoring methods are providing overall air quality indexes. However, these methods have limited functionalities to provide air quality of near my house or where I am now. In this paper, we are trying to overcome the limitation of traditional methods by using ubiquitous sensor network (USN). AirScope consists of computational fluid dynamics based air quality modeling, USN‐based sensor monitoring, and multi‐modal interaction platform. We present a brief overview of AirScope and several aspects of constructed initial indoor test environment with a few validity tests. The proposed system will be extended to an outdoor real‐world testbed with most of modern urban elements. Copyright © 2011 John Wiley & Sons, Ltd.</P>