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DETECTION OF B-MODE POLARIZATION AT DEGREE SCALES USING BICEP2
NGUYEN, HIEN T. The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
In this article, I give a brief description of Bicep2 experiment, and a summary of its result.
Oxidize Graphene by UV-Ozone Treatment in Vacuum Chamber
Dinh, S. Thach,Pham, T. H. Nhung,Nguyen, T. T. Hien,Dinh, N. T. Nghia,Vu, V. Quang,Hoang, T. K. Dung,Duong, D. Loc American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.8
<P>As changing graphene properties is vital to promote it as electronic device, we developed graphene modified method with epoxy group by two simple methods: ultraviolet irradiation with various partial oxygen pressures and ultraviolet irradiation under rich oxygen condition with various temperatures. By Hall measurement, the electric mobility in graphene was decreased with increasing temperature during UV-ozone treatment at 50 degrees C, 80 degrees C, 100 degrees C and 120 degrees C. At low partial oxygen pressure (less than 160 Torr) the oxidation degree is not significant. Additionally, Raman spectroscopy showed the disrupted pi-pi structure in graphene. Based on the above identification we supposed that epoxy group might establish on graphene surface.</P>
Ly H. Luu,Pham Hang L. B.,Huynh Hue T. T.,Nguyen Linh N.,Vu Trinh T.,Le Hien T. T. 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.2
Panax vietnamensis Ha et Grushv., an important medicinal plant in Vietnam, consists of several valuable ginsenosides. Compared to other Panax species, molecular and in silico studies concerning its transcriptomes and ginsenoside biosyn- thesis-related genes are still lacking. In this study, the transcriptomes of 1-year-old leaves and roots of P. vietnamensis were sequenced and analyzed using the Illumina system. The expression of the selected ginsenoside biosynthesis-related genes was confirmed using real-time PCR. In total, 42,724, 41,564, and 43,021 unigenes were assembled for leaves, roots, and leaf and root tissues, respectively. More than 60% of the unigenes from both tissues were functionally annotated using at least one database from the Kyoto encyclopedia of genes and genomes, Pfam, gene ontology, the National Center for Biotechnol- ogy Information (NCBI) non-redundant protein sequence database, and the evolutionary genealogy of genes. Furthermore, the expression of the predominant transcripts in each cDNA library was analyzed and identified. In addition, 457 unigenes encoding the enzymes involved in ginsenoside biosynthesis were identified. Most genes encoding enzymes related to ginse- noside biosynthesis via both MVA and non-MVA pathways are indicated. Quantitative PCR analysis showed that β-amyrin synthase (β-AS), cytochrome P450 (CYP716A53v2, CYP716A52v2), and UDP-glycosyl transferase (UGT74AE2) were highly expressed, more so in the roots than in the leaves. Our results may answer the question of how genes are expressed and whether ginsenosides are produced and accumulated in the first growing year of P. vietnamensis leaves and roots. This first comprehensive transcriptome data of 1-year-old leaves and roots of P. vietnamensis is useful for further investigation of gin- seng development, biosynthesis, major secondary metabolite pathways, and related gene expression in different tissues and developmental stages. Data also provide useful information for improving ginseng biosynthesis using biotechnology tools.