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Ju´ lia Gy}orfi,Andra´s Geo¨sel,Ma´ria Kiss,Katalin Nemes,Mariann Cso´ka,Korne´l Kora´ny 한국식품영양과학회 2013 Journal of medicinal food Vol.16 No.2
In Hungary, fairly little is known about Agaricus subrufescens Peck (formerly called Agaricus blazei Murrill), which is cultivated on an industrial scale in the Far East. Nevertheless, this mushroom species exerts a curative influence and might become a new pillar of cancer research and antitumorous therapy. The present study gives a detailed discussion on the compositional differences of the scent components of A. subrufescens and its close relative Agaricus bisporus based on gas chromatography–mass spectrometry measurements, subsequent to Likens–Nickerson simultaneous distillation–extraction.
Cr-doped BiYO3 photocatalyst for degradation of oxytetracycline under visible light irradiation
Hernández-Arellano Diana L.,Durán-Álvarez Juan C.,Cortés-Lagunes Silvana,Zanella Rodolfo,Soto Tania E.,López-Juárez Rigoberto 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.1
Chromium-doped BiYO3 powders were synthesized by the Pechini method at low temperature between 400 and 800 °C for 1 h. From the XRD results it was observed the coexistence between tetragonal and cubic phases for samples calcined at 400 °C for 1 h. Meanwhile, for samples calcined at 600 and 800 °C, a single cubic phase was observed. The powders consisted of agglomerates of nanocrystals as shown in the SEM and TEM images. The specific surface area was in the order of 3.01–7.74 m2 g−1, obtained from BET analysis. The band gap of BiYO3 and Cr-doped BiYO3 was < 2.21 eV which corroborates that these materials absorb light in the visible region of the electromagnetic spectrum. The photocatalytic decomposition of oxytetracycline was successfully achieved using Cr-doped BiYO3, where the best performance was obtained with BiY0.98Cr0.02O3 ceramic powders calcined at 800 °C for 1 h. For this composition the removal of oxytetracycline after 240 min of visible light irradiation was 100% of degradation and 75% of mineralization. The photocatalytic process was driven by the photo-holes, as a negligible production of ·OH radicals was observed in tests using scavengers. The photocatalytic activity of the BiY0.995Cr0.005O3 and BiY0.98Cr0.02O3 materials was corroborated under more realistic conditions, using tap water and trace concentration of the antibiotic. The high stability of the photocatalyst was observed through four consecutive reaction cycles. The results demonstrate that the Cr-doping has clearly improved the catalytic performance of BiYO3 for degradation of oxytetracycline under visible light irradiation.
Characterization of CBD-CdSe1-ySy deposited at low-temperature for photovoltaic applications
J.I. Contreras-Rascón,J. Díaz-Reyes,J.E. Flores-Mena,M. Galvan-Arellano,L.A. Juárez-Morán,R.S. Castillo-Ojeda 한국물리학회 2015 Current Applied Physics Vol.15 No.12
We present the structural and optical characterization of cadmium selenide sulphur (CdSe1-ySy) deposited by chemical bath deposition (CBD) technique at low-temperature (20 ± 2 ℃). The sulphur molar fraction is varied from 0 to 42.13%. The chemical stoichiometry is estimated by energy-dispersive X-ray spectroscopy (EDS). The CdSe1-ySy shows hexagonal wurtzite crystalline phase, which was found by X-ray diffraction (XRD) analysis and it was confirmed by Raman spectroscopy. The average grain size of the CdSe1-ySy films was ranged from 1.20 to 1.68 nm that was determined by Debye-Scherrer equation from W(002) direction and it was confirmed by high resolution transmission electron microscopy (HRTEM). This average grain size indicates a high quantum confinement because of it is smaller than the Bohr radii of CdS (2.8 nm) and CdSe (4.9 nm). Raman spectra show two dominant vibrational bands about 208 and 415 cm-1 associated at CdSe-1LO-like and CdSe-2LO-like. By transmittance measurements at room temperature are found that the optical band gap energies vary from 1.86 to 2.16 eV in the range of investigated sulphur molar fraction. Room temperature photoluminescence shows radiative bands in the visible range and a dominant band in the UV range, approximately 3.0 eV, which can be associated with a radiative transition, bound exciton to donor impurity.
Genetic diversity and natural selection of Duffy binding protein of Plasmodium vivax Korean isolates
Ju, H.L.,Kang, J.M.,Moon, S.U.,Bahk, Y.Y.,Cho, P.Y.,Sohn, W.M.,Park, Y.K.,Park, J.W.,Kim, T.S.,Na, B.K. Verlag für Recht und Gesellschaft ; Elsevier 2013 Acta tropica Vol.125 No.1
Plasmodium vivax Duffy binding protein (PvDBP) is a micronemal type I membrane protein that plays an essential role in erythrocyte invasion of merozoites. PvDBP is a prime blood stage vaccine candidate antigen against P. vivax, but its polymorphic nature represents a major obstacle to the successful design of a protective vaccine against vivax malaria. In this study, we analyzed the genetic polymorphism and natural selection at the N-terminal cysteine-rich region of PvDBP (PvDBPII) among 70 P. vivax isolates collected from Korean patients during 2005-2010. Seventeen single nucleotide polymorphisms (SNP), which resulted in 14 non-synonymous and 3 synonymous mutations, were found in PvDBPII among the Korean P. vivax isolates. Sequence analyses revealed that 13 different PvDBPII haplotypes, which were clustered into 3 distinct clades, were identified in Korean P. vivax isolates. The difference between the rates of nonsynomyous and synonymous mutations suggested that the region has evolved under natural selection. High selective pressure preferentially acted on regions identified or predicted to be B- and T-cell epitopes and MHC binding regions of PvDBPII. Recombination may also contribute to genetic diversity of PvDBPII. Our results suggest that PvDBPII of Korean P. vivax isolates display a limited genetic polymorphism and are under selective pressure. These results have significant implications for understanding the nature of the P. vivax population circulating in Korea and provide useful information for development of malaria vaccines based on this antigen.
농업부산물 바이오매스의 온도별 질량감소에 따른 반탄화(torrefaction) 수율 예측 및 특성분석
주영민 ( Ju Y. M. ),조라훈 ( L. H. Cho ),이서현 ( S. H. Lee ),박선용 ( S. Y. Park ),정인선 ( I. S. Jeong ),이상열 ( S. Y. Lee ),이충건 ( C. G. Lee ),주상연 ( S. Y. Joo ),김대현 ( D. H. Kim ),오광철 ( K. C. Oh ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2017 강원 농업생명환경연구 Vol.29 No.1
Recently, global warming and environmental pollution are accelerating because of the continuous use of fossil fuels. Energy sources from biomass are considered one of the possible solutions to overcome this problem. In this study, application of agricultural by-products as new bioenergy resources through torrefaction was investigated. Pepper stems were selected from among domestic agricultural by-products to perform this energy conversion process. The sample was crushed and separated (standard testing sieve) into particles of 2.36 mm or less. The selected materials were injected into a prototype capsule, and the experiment was repeated three times for 10 min at a reaction temperature of 200°C, 230°C, or 270°C for up to 40 min. Mass reduction was measured after 1 h of cooling to minimize rapid reaction with oxygen in the atmosphere. Frequency factor coefficients and activation energy of lignocellulosic biomass were investigated for simulation analysis. The reaction rate constants were derived from the experimental results, and mass reduction was predicted with respect to different temperatures through a simulation. The experimental results were in good agreement with the simulation values 0.95 of the correlation and 0.46 of the RMSE. It will be necessary to develop a model that includes dry moisture, particle size, and reactor shape, because these factors may have a significant influence on the torrefaction process.
Chung, S.I.,Moon, H.,Ju, H.L.,Cho, K.J.,Kim, D.Y.,Han, K.H.,Eun, J.W.,Nam, S.W.,Ribback, S.,Dombrowski, F.,Calvisi, D.F.,Ro, S.W. Elsevier Science Publishers 2016 Journal of hepatology Vol.64 No.3
<P>Background & Aims: Liver fibrosis is an increasing health concern worldwide and a major risk factor for hepatocellular carcinoma (HCC). Although the involvement of Hedgehog signaling in hepatic fibrosis has been known for some time, the causative role of activated Hedgehog signaling in liver fibrosis has not been verified in vivo. Methods: Using hydrodynamics-based transfection, a transgenic mouse model has been developed that expresses Sonic Hedgehog (SHH), a ligand for Hedgehog signaling, in the liver. Levels of hepatic fibrosis and fibrosis-related gene expression were assessed in the model. Hepatic expression of SHH was induced in a murine model for hepatocellular adenoma (HCA) and tumor development was subsequently investigated. Results: The transgenic mice revealed SHH expression in 2-5% of hepatocytes. Secreted SHH activated Hedgehog signaling in numerous cells of various types in the tissues. Hepatic expression of SHH led to fibrosis, activation of hepatic stellate cells, and an upregulation of various fibrogenic genes. Liver injury and hepatocyte apoptosis were observed in SHH mice. Persistent expression of SHH for up to 13 months failed to induce tumors in the liver; however, it promoted liver tumor development induced by other oncogenes. By employing a HCA model induced by P53(R172H) and KRAS(G12D), we found that the SHH expression promoted the transition from HCA to HCC. Conclusions: SHH expression in the liver induces liver fibrosis with concurrent activation of hepatic stellate cells and fibrogenic genes. It can also enhance hepatocarcinogenesis induced by other oncogenes. (C) 2015 European Association for the Study of the Liver. Published by Elsevier B.V. All rights reserved.</P>
TWEAK Promotes Osteoclastogenesis in Rheumatoid Arthritis
Park, J.S.,Kwok, S.K.,Lim, M.A.,Oh, H.J.,Kim, E.K.,Jhun, J.Y.,Ju, J.H.,Park, K.S.,Park, Y.W.,Park, S.H.,Kim, H.Y.,Cho, Y.G.,Cho, M.L. American Association of Pathologists and Bacteriol 2013 The American journal of pathology Vol.183 No.3
Bone destruction is critical in the functional disability of patients with rheumatoid arthritis (RA). Osteoclasts, specialized bone-resorbing cells regulated by cytokines, such as receptor activator of NF-κB ligand (RANKL), are primarily implicated in bone destruction in RA. The aim of the study was to examine whether tumor necrosis factor-like weak inducer of apoptosis (TWEAK), a member of the tumor necrosis factor superfamily, has osteoclastogenic activity in patients with RA and in animal models, including mice with collagen-induced arthritis (CIA) and IL-1 receptor antagonist knockout (IL-1RaKO) mice. TWEAK was increased in the synovium, synovial fluid, and serum of patients with RA and in the synovium of CIA mice and IL-1RaKO mice. TWEAK induced RANKL expression in mixed joint cells and splenocytes from CIA mice, IL-1RaKO mice, and fibroblast-like synoviocytes from patients with RA. Both osteoclast precursor cells and osteoclasts express TWEAK receptor fibroblast growth factor-inducible 14. In addition, TWEAK enhanced in vitro osteoclastogenesis without the presence of RANKL-providing cells and by inducing RANKL expression in fibroblast-like synoviocytes. Moreover, treatment with fibroblast growth factor-inducible 14-Fc inhibited RANKL-induced osteoclastogenesis, indicating that endogenous TWEAK also has osteoclastogenic activity. Our data demonstrated that TWEAK promotes osteoclastogenesis in RA, suggesting that therapeutic strategies targeting TWEAK could be effective for treatment of patients with RA, especially in preventing bone destruction.