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Yu Kawano,Jakapan Chantana,Takashi Minemoto 한국물리학회 2015 Current Applied Physics Vol.15 No.8
Tin(II) sulfide (SnS) films are one of the most promising absorber materials for high efficiency solar cells without using rare metals. In this work, SnS films were deposited by the thermal evaporation on glass substrates under the variation of growth temperatures of 100-250 ℃. It was revealed that the SnS thin film prepared under the temperature of 100 ℃ had relatively small crystal grains. On the other hand, the denser and larger crystal grains of the SnS films were obtained with the constant compositions, when the growth temperature increased to 225 ℃. With the temperature of higher than 225 ℃, the SnS began to be re-evaporated from the films. The highest Hall mobility of the films was obtained under the temperature of 200 ℃. Ultimately, the results suggested that the optimized growth temperature of SnS by the evaporation is 200 ℃, giving rise to compact and large crystal grains and the highest Hall mobility, thereby contributing to the 2.53%-efficient SnS thin-film solar cell.
Nakai, Naoya,Kawano, Fuminori,Oke, Yoshihiko,Nomura, Sachiko,Ohira, Takashi,Fujita, Ryo,Ohira, Yoshinobu Korean Society for Molecular and Cellular Biology 2010 Molecules and cells Vol.30 No.6
It has been proposed that mechanically induced tension is the critical factor in the induction of muscle hypertrophy. However, the molecular mechanisms involved in this process are still under investigation. In the present study, the effect of mechanical stretch on intracellular signaling for protein translation initiation and elongation was studied in C2C12 myoblasts. Cells were grown on a silicone elastomer chamber and subjected to 30-min of 5 or 15% constant static or cyclic (60 cycles/min) uniaxial stretch. Western blot analyses revealed that p70 S6 kinase (p70S6K) and eukaryotic elongation factor 2 (eEF2), which are the markers for translation initiation and peptide chain elongation, respectively, were activated by both static and cyclic stretch. The magnitude of activation was greater in response to the 15% cyclic stretch. Cyclic stretch also increased the phosphorylation of MAP kinases (p38 MAPK, ERK1/2 and JNK). However, the pharmacological inhibition of MAP kinases did not block the stretch-induced activation of p70S6K and eEF2. An inhibitor of the mammalian target of rapamycin (mTOR) blocked the stretch-induced phosphorylation of p70S6K but did not affect the eEF2 activation. A broad-range tyrosine kinase inhibitor, genistein, blocked the stretch-induced activation of p70S6K and eEF2, whereas Src tyrosine kinase and Janus kinase (JAK) inhibitors did not. These results suggest that the stretch-induced activation of protein translation initiation and elongation in mouse myoblast cell lines is mediated by tyrosine kinase(s), except for Src kinase or JAK.
Kita, Yasuyuk,Shibata, Norio,Kawano, Noriyuki,Tohjo, Takashi,Fujimori, Chino,Ohishi, Hirofumi 梨花女子大學校 藥學硏究所 1994 藥學硏究論文集 Vol.- No.4
We report the first biomimetic conversion of Arnstein tripeptide analogues (1a and 1b) into cis, ß-lactams (2a and 2b) using O-silylated ketene acetal (3) involving asymmetric induction from the sulfoxide sulfur to the α-carbon. The peptide 1 was treated with 3 at room temperature in the presence of a catalytic amount of ZnI_2, in MeCN to give cis-2, trans-2, and α-siloxysulfide (7). Reaction of R-1 with 3 gave cis-2 predominantly, and S-1 gave a mixture of cis-2 and trans-2. High cis selectivity was obtained by the use of a large volume of solvent and was strongly influenced by the absolute stereochemistry of the sulfaxide, the cysteinylamino group, and the volume of solvent. The cis ß-lactams (2a,b) were obtained preferentially from R-la,b. These chemical transformations strongly support Baldwin's mechanism which involves the initial formation of the cis ß-lactam by the Pummerer-type cyclization of the Arnstein tripeptide in penicillin biosynthesis and provide useful information on the first key step in penicillin biosynthesis.
Naoya Nakai,Fuminori Kawano,Yoshihiko Oke,Sachiko Nomura,Takashi Ohira,Ryo Fujita,Yoshinobu Ohira 한국분자세포생물학회 2010 Molecules and cells Vol.30 No.6
It has been proposed that mechanically induced tension is the critical factor in the induction of muscle hypertrophy. However, the molecular mechanisms involved in this process are still under investigation. In the present study,the effect of mechanical stretch on intracellular signaling for protein translation initiation and elongation was studied in C2C12 myoblasts. Cells were grown on a silicone elastomer chamber and subjected to 30-min of 5 or 15%constant static or cyclic (60 cycles/min) uniaxial stretch. Western blot analyses revealed that p70 S6 kinase (p70S6K) and eukaryotic elongation factor 2 (eEF2), which are the markers for translation initiation and peptide chain elongation, respectively, were activated by both static and cyclic stretch. The magnitude of activation was greater in response to the 15% cyclic stretch. Cyclic stretch also increased the phosphorylation of MAP kinases (p38 MAPK,ERK1/2 and JNK). However, the pharmacological inhibition of MAP kinases did not block the stretch-induced activation of p70S6K and eEF2. An inhibitor of the mammalian target of rapamycin (mTOR) blocked the stretch-induced phosphorylation of p70S6K but did not affect the eEF2activation. A broad-range tyrosine kinase inhibitor, genistein,blocked the stretch-induced activation of p70S6K and eEF2, whereas Src tyrosine kinase and Janus kinase (JAK) inhibitors did not. These results suggest that the stretch-induced activation of protein translation initiation and elongation in mouse myoblast cell lines is mediated by tyrosine kinase(s), except for Src kinase or JAK.
Kazuhiko Kinoshita,Kazuki Ginnan,Keita Kawano,Hiroki Nakayama,Tsunemasa Hayashi,Takashi Watanabe 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
In recent years, LTE system with unlicensed bands is proposed. It can achieve not only to boost the capacity of cellular networks but also to use unlicensed bands effectively since LTE can achieve better spectrum efficiency than Wi-Fi. However, when LTE is introduced into an environment where Wi-Fi access points are already deployed, significant interference may be caused to Wi-Fi. Therefore, the coexistence of LTE and Wi-Fi with unlicensed bands is the problem. In this paper, we assume an environment where LTE base stations and Wi-Fi access points are deployed high-densely with unlicensed bands and co-channel interference frequently is caused. Then, we aim to enhance the average user throughput and its fairness through a centralized control of LTE and Wi-Fi. Specifically, we propose a channel assignment method and a users’ access system selection method using GA. The proposed method enhances both the average user throughput and the fairness of user throughput compared with conventional static channel assignment methods.
Takeguchi Kota,Chantana Jakapan,Nakayama Koichi,Kawano Yu,Nishimura Takahito,Hishikawa Yoshihiro,Minemoto Takashi 한국물리학회 2021 Current Applied Physics Vol.28 No.-
Spectral mismatch correction factor (MM) is determined by average photon energy (APE). APE based on wide solar spectral ranges leads to better description of solar spectral shape. Moreover, error between corrected outdoor short-circuit current (ISC) of PV module and its ISC under standard test conditions is investigated using PV module irradiance sensor (PVMS) and/or MM, where PVMS is a single-crystalline silicon PV module. The error of muti-crystalline silicon (mc-Si) PV module is as low as about 1% regardless of the use of MM attributed to small spectral mismatch between PVMS and mc-Si PV module. On the other hand, the low error of CdTe test PV module is obtained under the use of both PVMS and MM caused by the high spectral mismatch between PVMS and CdTe test PV module. The error is further decreased, when MM is estimated from the APE based on wide ranges of the solar spectrum.