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Meiotic role of SWI6 in Saccharomyces Cerevisiae
Araki, Hiroyuki,Leem, Sun-Hee,Chung, Chung-Nam,Sunwoo, Yangil 東亞大學校附設遺傳工學硏究所 1999 遺傳工學硏究 Vol.- No.6
The transcript levels of DNA replication genes and some recombination genes in Saccharomyces cerevisiae fluctuate and peak at the G1/S boundary in the mitotic cell cycle. This fluctuation is regulated by MCB(Mlu/cell cycle box) elements which are bound by the DSC1/MBF1 complex consisting of Swi6 and Mbp1. It is also known that some of the MCB-regulated genes are induced by treatment with DNA damaging agents and in meiosis. In this report, the function of △SWI6 in meiosis was investigated. △swi6 cells underwent sporulation as did wild-type cells. However, the deletion mutant cells showed reduced spore viability and lower frequency of recombination. The transcript levels of the recombination genes RAD51 and RAD54, which have MCB elements, were reduced in △swi6 cells. The transcript levels of SW16 itself were also induced and declined in meiosis. Furthermore, an increased dosage of SW16 enhanced the transcript level of the RAD51 gene and also the recombination frequency in meiosis. These results suggest that SW16 enhances the expression level of the recombination genes in meiosis in a dosage-dependent manner, which results in an effect on the frequency of meiotic recombination.
Araki, Shinji,Ishikawa, Yasuaki,Wang, Xudongfang,Uenuma, Mutsunori,Cho, Donghwi,Jeon, Seokwoo,Uraoka, Yukiharu Springer US 2017 NANOSCALE RESEARCH LETTERS Vol.12 No.1
<P>Fabrication methods for a 3D periodic nanostructure with excellent and unique properties for various applications, such as photonic and phononic crystals, have attracted considerable interest. Templating processes using colloidal crystals have been proposed to create nanoshell-based 3D structures over a large area with ease. However, there are technical limitations in structural design, resulting in difficulties for structural flexibility. Here, we demonstrate a combination of proximity field nanopatterning and infiltration processes using solution-derived ZnO for a nanoshell-based 3D periodic structure with high structural flexibility and controllability. A unique process of infiltration of a solution-derived material into a polymeric template prepared by a proximity field nanopatterning process achieves the fabrication of a pre-formed layer that works as a protective layer for the template and framework for the inverse structure. Subsequently, this process shows the controllability of nanoshell thickness and significant improvement in the structure height shrinkage factor (16%) compared to those of a previous non-vacuum infiltration method (34%). The proposed method offers high controllability and flexibility in the design of structural sizes, leading to further development toward nanoshell-based 3D structures for various applications including energy devices and sensors.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1186/s11671-017-2186-6) contains supplementary material, which is available to authorized users.</P>
Araki, Kazutoshi,Inami, Takeo,Nakajima, Hiroaki Institute of Pure and Applied Physics 2006 Progress of theoretical physics Vol.116 No.5
<P>We study the instanton equation of the supersymmetric <TEX>$CP^{N-1}$</TEX> sigma model on non(anti)commutative superspace in two dimensions. We show that the undeformed instanton equation is consistent with the deformed equations of motion. Then we conclude that the instanton equation is not deformed by superspace non(anti)commutativity.</P>
Rapid measurements of hydrogen cyanide concentration in combustion gas via terahertz spectroscopy
Araki Mitsunori,Matsuyama Ken 한국물리학회 2022 Current Applied Physics Vol.36 No.-
The development of a real-time measurement system to determine the concentrations of combustion gases mixed with smoke particles in fire environments is an essential technical issue in the fire safety field. In this study, the absorption line for the J = 8–7 rotational transition at 708.9 GHz of hydrogen cyanide (HCN) produced by the combustion of silk is rapidly measured in a 1 m cell during repeat scans (seven times a minute) via terahertz spectroscopy. The obtained time profile of HCN concentrations agrees well with the time profile obtained via Fourier transform infrared (FT-IR) spectroscopy. The maximum concentrations derived via terahertz spectroscopy are consistent with those derived via FT-IR within an accuracy of 10%. The minimum sensitivity of HCN is 100 ppm as detected via terahertz spectroscopy. The repetition rate, the accuracy, and the sensitivity for the scans demonstrate the potential of terahertz spectroscopy to rapidly diagnose combustion gas flow concentrations in fire environments.
Araki, Kaori,Kodani, Iku,Gupta, Nidhi,Gill, Diane L. The Korean Society for Preventive Medicine 2013 예방의학회지 Vol.46 No.suppl
Multicultural scholarship in sport and exercise psychology should help us understand and apply cultural competencies for all to be physically active. In the present study, two Asian countries, Japan and Singapore, were chosen. The participation rate for physical activities among adolescent girls tends to be lower than that of boys in both countries. Thus, the purpose of the project was to gain knowledge and understanding about sociocultural factors that may explain adolescent girls' perceptions and behaviors toward sport, physical activity, and physical education (PE). A qualitative approach using semi-structured interviews with focus groups was used to understand meanings of physical activity among Buddhist Japanese, and Hindu Indians and Christian Chinese from Singapore. Each focus group consisted of four or five girls and female researchers. Based on the analysis, we created four themes which were "cultural identities", "Asian girls and sport/physical activities", "PE experiences", "motivation for future involvement". The Buddhist Japanese, Hindu Indian, and Christian Chinese participants each reported unique physical activity experiences, and all the participants were aware of how Asian culture may affect being physically active. Experiences of PE classes were similar but perceptions of their PE attire were different for Christian Chinese and Hindu Indian adolescent girls. Based on the results, the importance of nurturing cultural competencies and ways to encourage girls to be physically active throughout life were discussed.
Cover Crop Use in Tomato Production in Plastic High Tunnel
Araki Hajime,Shiori Hane,Yoichiro Hoshino,Toshiyuki Hirata 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.4
More than 70% of fresh tomato is produced in plastic high tunnel or greenhouse and much fertilizer and agricultural chemicals have been applied for tomato production. Cover crop is one of the important tools for sustainable agro-production because of improving soil properties. Effect of cover cropping on soil properties and tomato production in plastic high tunnel was examined in Sapporo, Japan, snow cover region. Plastic high tunnel was set before snow-melting, late in March, 2007. Two cover crops, legume (hairy vetch; Vicia villosa R.) and non legume (wild oat; Avena sterigosa L.), were planted each alone or mix-planted in the plot (0.8 m in width and 3.5 m in length) early in April. Seeding density in mono-culture was 5 ㎏/10a in hairy vetch and 10 ㎏/10a in wild oat. For bi-culture, density was 3.5 ㎏/10a in hairy vetch and 5 ㎏/10a in wild oat. Above ground biomass (dry weight) was shown 445 ㎏/10a in hairy vetch and 982 ㎏/10a in wild oat late in May. However, in mix-culture, it was 190 ㎏/10a in hairy vetch and 602 ㎏/10a in wild oat. Cover crops were killed for residue mulch just before tomato planting. Seedlings of tomato ‘Momotaro’ were planted in the plots covered with cover crop residue and 12 ㎏/10a N fertilizer application (12 ㎏ N/10a) and bare plot with 12 ㎏/10a or 24 ㎏/10a N fertilizer (24 ㎏ N/10a) application. Nitrate concentration of the petiole sap in the leaf just below the first fruit cluster was higher in the tomatoes grown in bare plot with 24㎏ N/10a and in hairy vetch mulch with 12㎏ N/10a at 40 days after transplanting. Large yield was shown in bare plot with 24㎏ N/10a (7.9t/10a) and in hairy vetch plot with 12㎏ N/10a (7.8t/10a). The yield in bare plot with 12㎏ N/10a and Mix plot with 12㎏ N/10a was 6.9t/10a. The yield in wild oat plot with 12㎏ N/10a was the smallest (6.1t/10a). Soil carbon in the plots with cover crop mulch became higher than that of bare plots after tomato production. It will be possible to obtain current yield and to increase soil carbon in cover cropping with reduction of N fertilizer. This technique will lead the organically grown system in plastic high tunnel production.