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Cha, J. W.,Piao, M. J.,Kim, K. C.,Zheng, J.,Yao, C. W.,Hyun, C. L.,Kang, H. K.,Yoo, E. S.,Koh, Y. S.,Lee, N. H. HUMANA PRESS INC 2014 Applied biochemistry and biotechnology Vol.172 No.5
The aim of the present study was to elucidate the protective properties of 3,4-dihydroxybenzoic acid (DBA) isolated from Cladophora wrightiana Harvey (a green alga) against ultraviolet B (UVB)-induced damage to human HaCaT keratinocytes. DBA exhibited scavenging actions against the 1,1-diphenyl-2-picrylhydrazyl radical, the superoxide anion, and the hydroxyl radical. Furthermore, DBA decreased the levels of intracellular reactive oxygen species generated by hydrogen peroxide or UVB treatment of the cells. DBA also decreased the UVB-augmented levels of phospho-histone H2A.X and the extent of comet tail formation, which are both indications of DNA damage. In addition, the compound safeguarded keratinocytes from UVB-induced injury by reversing the production of apoptotic bodies, overturning the disruption of mitochondrial membrane potential, increasing the expression of the anti-apoptotic protein, B-cell lymphoma 2, and decreasing the expression of the pro-apoptotic proteins, Bcl-2-associated X and cleaved caspase-3. Taken together, these results demonstrate that DBA isolated from a green alga protects human keratinocytes against UVB-induced oxidative stress and apoptosis.
Studies on Saccharification from Alginate using Stenotrophomonas maltophilia
Choi, D.,Ryu, B.Y.,Piao, Y.L.,Choi, S.k.,Jo, B.W.,Shin, W.S.,Cho, H. Korean Society of Industrial and Engineering Chemi 2008 Journal of industrial and engineering chemistry Vol.14 No.2
Various environmental factors affecting saccharification from alginate using Stenotrophomonas maltophilia were investigated in flask cultures. The cell concentrations increased from 0.6 to 0.92 optical density (OD) at 660nm when the agitation rate increased from 15 to 90rpm. On the other hand, the maximum concentration of sugar was obtained at 3.8g/l after 4 days of culture at 15rpm. After 3 days of preculture at 33<SUP>o</SUP>C, the sugar concentration peaked at 5.0g/l after 5 days of culture. When 10g/l of NaCl was used, the maximum concentration of sugar, 5.3g/l, was obtained after 5 days of culture. Yeast extract and peptone were the best nitrogen source for effective saccharification. Especially, the sugar concentration was 6.1g/l after 5 days of culture using a mixture of 1.0g/l of yeast extract and 1.0g/l of peptone. Under optimum conditions of culture and media, scale-up for effective saccharification from alginate was carried out in 5l flasks. The cell concentration after 2 days of culture was 0.61 OD at 660nm and showed no further increase after 3 days of culture. The sugar concentrations from alginate were increased with increasing culture time to 7.9g/l after 9 days of culture.
Pan, L.,Zhao, P.F.,Yang, Z.Y.,Long, S.F.,Wang, H.L.,Tian, Q.Y.,Xu, Y.T.,Xu, X.,Zhang, Z.H.,Piao, X.S. Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.12
Two experiments were conducted to evaluate effects of coated compound proteases (CC protease) on apparent total tract digestibility (ATTD) of nitrogen (N) and energy, and apparent ileal digestibility (AID) of amino acids (AA) and nutrients in diets for pigs. In Exp. 1, 12 crossbred barrows (initial body weight: $20.79{\pm}1.94kg$) were housed in individual metabolism crates and allotted into 2 treatments with 6 piglets per treatment according to weight in a randomized complete block design. The 2 diets were corn-soybean meal basal diets with (0.2 g/kg) or without CC protease supplementation. The CC protease supplementation increased (p<0.05) the digestible and metabolizable N and energy values and the digestibility and retention rate of N in the diet. The ATTD of energy and nutrients had been improved (p<0.05) in the diet supplemented with CC protease. In Exp. 2, 12 crossbred barrows (initial body weight: $20.79{\pm}1.94kg$), fitted with T-cannulas at the distal ileum, were blocked by body weight into 2 groups with 6 pigs each. The diets were the same as those in Exp. 1. The CC protease increased (p<0.05) the AID of crude protein and some essential AA including arginine, isoleucine and leucine. The AID and ATTD of energy and nutrients had been improved (p<0.05) by supplemental CC protease, but the hindgut digestibility of nutrients was unaffected. Overall, the CC protease improved the ATTD of N and energy and AID of some indispensible AA and nutrients in the corn-soybean meal diet for pigs. Therefore, the CC protease supplement could improve the utilization of protein in the corn-soybean meal diet and thus contribute to lower N excretion to the environment.
Chae, H.S.,Zhang, W.L.,Piao, S.H.,Choi, H.J. Elsevier 2015 Applied clay science Vol.107 No.-
Palygorskite (Pal) clay coated with semiconducting polyaniline (PANI) nanocomposite particles was prepared by oxidative polymerization using aniline monomer in the presence of Pal. The morphological characteristics of the synthesized Pal/PANI composite particles were examined by both field emission scanning electron microscopy and transmission electron microscopy. A rotational rheometer was also used to examine the rheological behavior of the Pal/PANI composite-based electrorheological (ER) fluid when the nanocomposite particles were dispersed in silicone oil. From its flow curve of shear stress vs. shear rate investigated under an applied electric field, the typical ER behavior of the Pal/PANI-based ER fluid was observed. In addition, polarizability and relaxation time of the ER system obtained from the dielectric spectra were well correlated with its ER performance.
Liu, Z.H.,Yang, F.Y.,Kong, L.J.,Lai, C.H.,Piao, X.S.,Gu, Y.H.,Ou, X.Q. Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.10
A single factorial experiment was conducted to test the effects of three dietary levels of energy on mRNA expression of fatty acid synthase (FAS-mRNA) and hormone-sensitive lipase (HSL-mRNA) and their association with intramuscular fat in finishing pigs. 72 crossbred (Large $White{\times}Rongchang$) barrows with an average initial body weight of 20.71 (s.e. 0.1) kg, were randomly allotted to three dietary treatments (11.75, 13.05 and 14.36 MJ DE/kg) and fed until slaughtered at 100 or 101 kg. The diets were iso-nitrogenous and iso-essential amino acids. The growth performances including the duration of finishing were changed linearly (p<0.05) or quadratically (p<0.05) with increased dietary energy levels. The effects of dietary energy content on the percentage of external fat, intramuscular backfat and the fat thickness were linear (p<0.05). The content of dietary energy increased FAS-mRNA linearly or quadratically, while HSL-mRNA decreased linearly or quadratically in backfat and Longissmus dorsi muscle. Meanwhile, significant positive correlations (p<0.05) were found between energy level and intramuscular fat, FAS-mRNA or the ratio of FAS-mRNA to HSL-mRNA, between the ratio of FAS-mRNA to HSL-mRNA and intramuscular fat. However, the correlations between HSL mRNA and dietary energy or intramuscular fat were negative (p<0.05). The results indicated that dietary energy level regulates lipid accumulation, especially intramuscular fat, possibly by modulating the mRNA of FAS and HSL together rather than individually.
신승호(S.H. Shin),장인혁(I.H. Jang),김보현(B.H. Kim),박정국(Z.G. Piao),최연옥(Y.O. Choi),정병호(B.H. Jeong),조금배(G.B. Cho),백형래(H.L. Beak) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.4
DC-DC converter is DC power equipment. which function is convert voltage DC to low voltage DC. Such as the DC-DC converter device, all the signal chain devices to provide a stable power supply is to maintain stable operation and high efficiency is needed in order to control the switching. In order to advantage of this high-efficiency switching power supply it of SMPS (Switching Mode Power Supply), The DC-DC converter has high efficiency. In this paper, Atmel, produced ATmegal28 RISC 8-bit micro-processor using, DC-DC converter to select a default form Buck type Converter Through circuit design, theoretical analysis and experimental characteristics through the present study.
MPPT를 적용한 독립형 태양광 발전 시스템의 베터리 충 · 방전 제어기 설계
신승호(S.H. Shin),김대승(D.S. Kim),박정국(Z.G. Piao),이강연(G.Y. LEE),김현철(H.C. Kim),김대곤(D.G. Kim),백형래(H.L. Beak) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
신재생 에너지의 일환인 태양에너지를 이용한 태양광 발전은 태양전지의 외부조건에(온도, 일사량) 대해 출력 특성이 비선형 적으로 변화되는 특성을 가진다. 따라서 외부조건에 대해 태양전지가 항상 최대 전력점에서 동작 할수 있도록 추종해주는 컨버터가 필요하다. 본 논문에서는 이러한 문제점을 해결하기 위해 MPPT(Maximum power point tracking)를 적용한 170W 독립형 태양광 발전 시스템의 베터리충 · 방전 제어 시스템에 대해서 연구된다. 제안된 컨버터는 DC-DC 플라이벡 컨버터를 사용하였고 제어 MCU(Micro controller unit)은 Atmel 사의 8bit RISC 방식의 ATmega128, 제어 알고리즘에 Pertur bation & Observation (P&O) 방식을 적용 함으로서 시뮬레이션을 통해 그 타당성을 검증 하였다.
Jin, Y.H.,Oh, H.K.,Piao, L.G.,Jang, S.K.,Choi, Y.H.,Heo, P.S.,Jang, Y.D.,Kim, Y.Y. Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.9
This experiment evaluated the effects of dietary lysine restriction and energy density on growth performance, nutrient digestibility and meat quality of finishing pigs. A $2{\times}2$ factorial arrangement of treatments was utilized in a randomized complete block (RCB) design, and factor 1 was lysine restriction and factor 2 was energy density. The control diet was formulated to contain 3.265 Mcal of ME/kg, 0.75% lysine in the early-finishing phase and 3.265 Mcal of ME/kg, 0.60% lysine in the late-finishing phase and other nutrients met or exceeded NRC (1998) standards. Compared to the control diet (CON), lysine levels of experimental diets were restricted to 15% (treatment EL, EEL) or 30% (treatment ELL, EELL), whereas energy level of experimental diets was increased by 0.100 or 0.200 Mcal of ME/kg. A total of 100 crossbred pigs ([Yorkshire${\times}$Landrace]${\times}$Duroc), with average initial body weight of $58.47{\pm}1.42\;kg$, were allotted to 5 dietary treatments based on sex and body weight. Each treatment had 5 replicates with 4 pigs (two barrows and two gilts) per pen. ADG, ADFI and feed efficiency were calculated in an 8-week growth trial. In the late finishing period (5-8 weeks), pigs fed ELL or EELL diets had decreased ADG and feed efficiency (p<0.01), however, when the EEL diet was provided, a similar growth performance was observed compared to those fed the CON diet during the whole experimental period (p>0.05). In a metabolic trial, 15 pigs were used to evaluate the effect of dietary lysine restriction and energy density on nutrient digestibility. The digestibility of dry matter, crude fat and crude ash was not improved by restricting dietary lysine or energy density. However, crude protein digestibility was decreased (p<0.05) as dietary lysine was restricted. When dietary lysine was restricted, fecal nitrogen was increased whereas nitrogen retention was decreased. BUN concentration was affected by dietary lysine restriction; treatments ELL and EELL had higher BUN values than other treatments (p<0.01). Carcass characteristics and meat quality were measured when average body weight of pigs reached $107.83{\pm}1.50\;kg$. Treatment ELL had higher last rib backfat depth (p<0.05) than treatment CON, but ELL and EEL did not differ significantly. The ELL and EEL treatments had higher (p<0.05) subjective marbling score than treatment CON. Treatment EEL showed higher longissimus fat content than treatment EL and CON (p<0.01). The results indicated that finishing pigs fed a diet with 15% lysine restriction and 3.465 Mcal of ME/kg energy density had no detrimental effects on growth performance and N utilization, and could achieve substantial increases in marbling and longissimus fat content of pork.