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Toyohito Segawa,Naohisa Miyakoshi,Yuji Kasukawa,Hiroshi Aonuma,Hiroyuki Tsuchie,Yoichi Shimada 대한골다공증학회 2016 Osteoporosis and Sarcopenia Vol.2 No.1
Objectives: Reduced bone quality caused by vitamin C deficiency in older persons may lead to incidental fragility fractures during bisphosphonate treatment, although bisphosphonate increases bone mineral density (BMD). This study aimed to evaluate the effects of minodronate and ascorbic acid (Aa) on BMD, bone quality, and bone strength in Aa-deficient osteogenic disorder Shionogi (ODS) rats. Methods: Six-month-old ODS rats were divided into four groups (n ¼ 20 per group): (1) Aa supplementation (Aa þ ); (2) Aa-deficient (Aa ? ); (3) Aa supplementation and minodronate administration (Aaþ þ Mino); and (4) Aa-deficient and minodronate administration (Aa? þ Mino). BMD, bone strength, bone histomorphometry, and bone quality determined using Fourier transform infrared spectroscopy imaging (FTIRI) were evaluated after 4 and 8 weeks. Results: BMD was significantly higher in the Aaþ þ Mino group than in the Aa? group ( p < 0.05). Bone strength was significantly higher in the Aaþ and Aaþ þ Mino groups than in the Aa? group ( p < 0.05). Furthermore, bone strength was significantly higher in the Aaþ þ Mino group than in the Aa? þ Mino group ( p < 0.05). Minodronate treatment irrespective of Aa supplementation significantly decreased bone resorption compared with the Aaþ and Aa? groups ( p < 0.05). No significant differences in the parameters evaluated by FTIRI were observed between the groups. Conclusions: Aa supplementation improved bone strength in ODS rats. Combined treatment with minodronate and Aa, but not minodronate alone, improved bone strength and increased BMD. Aa is required for bone health because it is essential for osteoblast differentiation. © 2016 The Korean Society of Osteoporosis. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Early Stage of Algal Succession on Artificial Reefs at Muronohana, Ikata, Japan
Choi Chang Geun,Takayama Hiroshi,Segawa Shigeru,Ohno Masao,Sohn Chul Hyun The Korean Society of Fisheries and Aquatic Scienc 2000 Fisheries and Aquatic Sciences Vol.3 No.1
Different substrata fixed as the roof (for shadow) on artificial iron reef had been developed as a tool for valuable fishery resources. The experiment was set up on a sandy bottom substratum at 8m depth in Muronohana, Ikata, Japan. Within one month of placement of the plates, diatoms dominated the experimental plates with a coverage of $100\%$ approximately. Enteromorpha intestinalis and Colpomenia sinuosa dominated within three months after the placement. E. intestinalis coverage on substrata was estimated $7\%$ on the plate shaped iron bar, $12-14\%$ on concrete plates, $18\%$ on the plate fixed pebble, $61\%$ on the plate to accumulated wood, and 80-100% on the steel materials plate. Whereas after four months of placement, C. sinuosa coverage on plates became $1-36\%$ on different plates, and $100\%$ on the plate to accumulated wood. The differences in E. intestinalis and C. sinuosa colonization on the different substrata were probably due to variations in their surface roughness influencing the settlement of zoospores, and thus gametophyte. development. After five months of placement, the above two species slowly disappeared.
Shibayama Naoyuki,Kanda Hiroyuki,Yusa Shin-ichi,Fukumoto Shota,Baranwal Ajay K.,Segawa Hiroshi,Miyasaka Tsutomu,Ito Seigo 나노기술연구협의회 2017 Nano Convergence Vol.4 No.18
We confirmed the influence of ZnO nanoparticle size and residual water on performance of all inorganic perovskite solar cells. By decreasing the size of the ZnO nanoparticles, the short-circuit current density (Jsc) and open circuit photovoltage (Voc) values are increased and the conversion efficiency is improved. Although the Voc value is not affected by the influence of residual water in the solution for preparing the ZnO layer, the Jsc value drops greatly. As a result, it was found that it is important to use the oxide nanoparticles with a small particle diameter and to reduce the water content in the oxide forming material in order to manufacture a highly efficient all inorganic perovskite solar cells.
Ko, Soo-Byung,Ryu, Tae In,Cho, An-Na,Fujisawa, Junichi,Segawa, Hiroshi,Park, Nam-Gyu The Royal Society of Chemistry 2015 Physical chemistry chemical physics Vol.17 No.28
<P>Adsorption of the colorless 1,3-bis(dicyanomethylidene)indane (<B>BDMI</B>) onto a nanocrystalline TiO<SUB>2</SUB> surface unusually turned the <B>BDMI</B> a deep blue color. Upon contact of the <B>BDMI</B>-adsorbed TiO<SUB>2</SUB> (<B>BDMI-TiO<SUB>2</SUB></B>) with an iodide-based redox electrolyte, a photocurrent density as high as 14.9 mA cm<SUP>−2</SUP> was generated with a photovoltage of 0.42 V, leading to a power conversion efficiency of 3.63%. This unprecedented photovoltaic performance was simultaneously investigated by spectroscopic studies of <B>BDMI-TiO<SUB>2</SUB></B> films and density functional theory (DFT)/time-dependent DFT (TD-DFT) computational approaches for [<B>BDMI</B>]<SUP>−</SUP>[Ti(OH)<SUB>3</SUB>·H<SUB>2</SUB>O]<SUP>+</SUP> (<B>1</B>) as a simple model compound to inspect the light to current conversion abilities. All these results established that the color change from colorless to deep blue and the highly efficient photocurrent generation through binding on the TiO<SUB>2</SUB> surface originates from interfacial charge transfer transitions from anionic <B>BDMI</B> to TiO<SUB>2</SUB>.</P> <P>Graphic Abstract</P><P>Adsorption of colorless 1,3-bis(dicyanomethylidene)indane (<B>BDMI</B>) onto a nanocrystalline TiO<SUB>2</SUB> surface unusually turned the <B>BDMI</B> a deep blue color. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cp01512j'> </P>