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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.
Synthesis and characterization of YAG : Eu spray dryed powders
J. Zárate-Medina,R. López-Juárez,E. A. Aguilar-Reyes,J. Muñoz-Saldaña 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.1
YAG compounds doped with Eu have been successfully synthesized by spray drying a solution of precursor nitrates. Aluminum and yttrium nitrates, europium oxide, ethylene glycol and citric acid were used as reagents. The resultant solution was fed to a spray dryer to obtain precursor powders, which were in turn heat treated at 800, 850 and 900oC and characterized by X-ray diffraction. Morphology of the synthesized powders was observed by scanning and transmission electron microscopy. Results showed that the crystallization temperature of the powders is below 850oC without the presence of intermediate phases. The powders consist of spherical agglomerates constituted of primary particles of 40 nm diameter approximately. YAG compounds doped with Eu have been successfully synthesized by spray drying a solution of precursor nitrates. Aluminum and yttrium nitrates, europium oxide, ethylene glycol and citric acid were used as reagents. The resultant solution was fed to a spray dryer to obtain precursor powders, which were in turn heat treated at 800, 850 and 900oC and characterized by X-ray diffraction. Morphology of the synthesized powders was observed by scanning and transmission electron microscopy. Results showed that the crystallization temperature of the powders is below 850oC without the presence of intermediate phases. The powders consist of spherical agglomerates constituted of primary particles of 40 nm diameter approximately.
Effects of Dietary Spirulina on Vascular Reactivity
M.A. Juárez-Oropeza,D. Mascher,P.V. Torres-Durán,J.M. Farias,M.C. Paredes-Carbajal 한국식품영양과학회 2009 Journal of medicinal food Vol.12 No.1
There are several reports suggesting that Spirulina (Arthrospira) may have a beneficial effect in the prevention of cardiovascular diseases. Here we review the results of studies on the effects of dietary Spirulina on the vasomotor reactivity of aortic rings excised from either lean or obese Wistar rats. We also review preliminary results on the effects of Spirulina intake on plasma lipids and blood pressure in humans. The results of the former studies strongly suggest that Spirulina induces a tone-related increase in the synthesis/release of nitric oxide by the endothelium as well as an increase in the synthesis/release of a vasodilating cyclooxygenase-dependent metabolite of arachidonic acid and/or a decrease in the synthesis/release of a vasoconstricting eicosanoid by the endothelium. In humans, Spirulina maxima intake decreases blood pressure and plasma lipid concentrations, especially triacylglycerols and low-density lipoprotein-cholesterol, and indirectly modifies the total cholesterol and high-density lipoprotein-cholesterol values.
The Genomic Landscape and Clinical Relevance of A-to-I RNA Editing in Human Cancers
Han, L.,Diao, L.,Yu, S.,Xu, X.,Li, J.,Zhang, R.,Yang, Y.,Werner, Henrica M.J.,Eterovic, A.,Yuan, Y.,Li, J.,Nair, N.,Minelli, R.,Tsang, Y.,Cheung, Lydia W.T.,Jeong, K.,Roszik, J.,Ju, Z.,Woodman, Scott Cell Press 2015 CANCER CELL Vol. No.
Adenosine-to-inosine (A-to-I) RNA editing is a widespread post-transcriptional mechanism, but its genomic landscape and clinical relevance in cancer have not been investigated systematically. We characterized the global A-to-I RNA editing profiles of 6,236 patient samples of 17 cancer types from The Cancer Genome Atlas and revealed a striking diversity of altered RNA-editing patterns in tumors relative to normal tissues. We identified an appreciable number of clinically relevant editing events, many of which are in noncoding regions. We experimentally demonstrated the effects of several cross-tumor nonsynonymous RNA editing events on cell viability and provide the evidence that RNA editing could selectively affect drug sensitivity. These results highlight RNA editing as an exciting theme for investigating cancer mechanisms, biomarkers, and treatments.
Park, S.A.,Choi, J.,Ju, S.,Jegal, J.,Lee, K.M.,Hwang, S.Y.,Oh, D.X.,Park, J. IPC Science and Technology Press 2017 Polymer Vol.116 No.-
From an industrial/engineering point of view, the greatest demerit of solely isosorbide (ISB)-based polycarbonate is its fragility; this is considerably overcome in this study by using a dual-diol strategy with 1,4-cyclohexanedimethanol (CHDM). A series of copolycarbonates of ISB, a bio-derived diol with a rigid heterocyclic structure, and ductile CHDM monomers with diphenyl carbonate were prepared by transesterification polymerization. The weight-average molecular weight of the polycarbonates gradually decreases as the ratio of ISB increases; however, their T<SUB>g</SUB> and storage modulus increase. The ultimate elongation of the copolycarbonates is enhanced from 4.6 to 20% as the content of CHDM is increased from 30 to 80 mol%. ISB content greater than 50 mol% makes the copolycarbonates strong but brittle, and ISB content less than 50 mol% makes the copolycarbonates ductile but soft. The polycarbonate with 70/30 mol% of ISB/CHDM shows a 1.25-fold higher Young's modulus, 1.05-fold higher ultimate tensile strength, and one-grade higher pencil hardness than the bisphenol-A (BPA)-based polycarbonate. Interestingly, the hydrophilic ISB content does not affect the degree of hydrophilicity of the copolycarbonate samples. Water droplet contact angles are in the range of 81-87<SUP>o</SUP>, comparable to that of the BPA-based polycarbonate.
Effect of hypoxic treatment on bone marrow cells that are able to migrate to the injured liver
Ju, S.Y.,Cho, K.A.,Cho, S.J.,Jung, Y.J.,Woo, S.Y.,Seoh, J.Y.,Han, H.S.,Ryu, K.H. Published for the International Federation for Cel 2009 Cell biology international Vol.33 No.1
Restricted numbers and poor regenerative properties limit the use of adult stem cells. We tested the effect of hypoxic treatment as a method by which to increase cell migration. Bone marrow cells (BMCs) were cultured under oxygen saturations of 0.1, 3, and 20% for 24h. After hypoxic treatment, BMCs of apoptotic fraction were decreased. The expression of CXCR4 was noticeably increased in the hypoxia-treated BMCs and their migration in response to SDF-1α was enhanced compared with cells cultured under normoxic condition. Hypoxic BMCs had a higher degree of engraftment to the CCl<SUB>4</SUB>-injured liver than the normoxic cells. Hypoxic treatment of BMCs may have merits in decreasing apoptosis of those cells as well as in enhancing cellular migration to SDF-1α, the chemokine which binds to BMCs expressed CXCR4 and to the injured tissue, such as CCl<SUB>4</SUB> damaged liver.
Identification of a Novel SHP-2 Protein Tyrosine Phosphatase Inhibitor
Ju, A.,Seo, H.,Kim, H.,Park, B.C.,Park, S.G.,Kim, J.H.,Choi, H.-K.,Min, K.H.,Cho, S. THE JAPAN PUBLICATIONS TRADING CO LTD 2014 Bulletin of the Chemical Society of Japan Vol.87 No.3
The Src homology 2 (SH2) domain-containing phosphatase 2 (SHP-2) is a nonreceptor protein tyrosine phosphatase (PTP) involved in extracellular-regulated kinase (ERK) activation. Recent studies have shown that gain-of-function mutations in SHP-2 are associated with several diseases, including LEOPARD syndrome, Noonan syndrome, and juvenile myelomonocytic leukemia. In this study, we identified the novel SHP-2 inhibitor 3-(1-benzimidazolylmethyl)-6-p-tolyl-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazole (MLS-001). SHIP-2 activity was inhibited by MLS-001, whereas other types of PTPs, namely ACP1, CDC25A, DUSP3, DUSP14, DUSP18, DUSP22, DUSP23, DUSP26, and SSH3, were not. Furthermore, TCPTP and SHP-1 that are closely related to SHP-2 were not inhibited by the inhibitor. Kinetic studies with MLS-001 and SHP-2 revealed a competitive inhibition. The SHP-2 expressing cells treated with MLS-001 demonstrated reduced SHP-2 phosphatase activity, thereby suggesting that MLS-001 effectively passes through cell membranes. In addition, MLS-001 reduced SHP-2-mediated phosphorylation in the activation loop of ERK in cells. Therefore, MLS-001 could be a lead compound for developing a potent SHP-2 inhibitor.
A highly annotated whole-genome sequence of a Korean individual
Kim, Jong-Il,Ju, Young Seok,Park, Hansoo,Kim, Sheehyun,Lee, Seonwook,Yi, Jae-Hyuk,Mudge, Joann,Miller, Neil A.,Hong, Dongwan,Bell, Callum J.,Kim, Hye-Sun,Chung, In-Soon,Lee, Woo-Chung,Lee, Ji-Sun,Seo, Macmillan Publishers Limited. All rights reserved 2009 Nature Vol.460 No.7258
Recent advances in sequencing technologies have initiated an era of personal genome sequences. To date, human genome sequences have been reported for individuals with ancestry in three distinct geographical regions: a Yoruba African, two individuals of northwest European origin, and a person from China. Here we provide a highly annotated, whole-genome sequence for a Korean individual, known as AK1. The genome of AK1 was determined by an exacting, combined approach that included whole-genome shotgun sequencing (27.8× coverage), targeted bacterial artificial chromosome sequencing, and high-resolution comparative genomic hybridization using custom microarrays featuring more than 24 million probes. Alignment to the NCBI reference, a composite of several ethnic clades, disclosed nearly 3.45 million single nucleotide polymorphisms (SNPs), including 10,162 non-synonymous SNPs, and 170,202 deletion or insertion polymorphisms (indels). SNP and indel densities were strongly correlated genome-wide. Applying very conservative criteria yielded highly reliable copy number variants for clinical considerations. Potential medical phenotypes were annotated for non-synonymous SNPs, coding domain indels, and structural variants. The integration of several human whole-genome sequences derived from several ethnic groups will assist in understanding genetic ancestry, migration patterns and population bottlenecks.