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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/).
Electronic States for Dense Kondo Amorphous Alloy Ce-Al
Wuriga,Kotaro Segawa,Yusuke Amakai 한국물리학회 2023 새물리 Vol.73 No.12
We have performed the magnetic susceptibility χ, specific heat C<SUB>p</SUB>, and photoelectron spec-troscopy (XPS) measurements on the dense Kondo amorphous alloys Ce<SUB>50-x</SUB>La<SUB>x</SUB>Al<SUB>50</SUB> and discussed its electronic structure. The χ follows a Curie-Weiss law with the paramagnetic e_ective magnetic 2.1{2.3 _B/Ce-atom above 70 K. The electronic specific heat coe_cient per Ce-atom Ce is almost constant in each La concentration (<SUB>rCe</SUB> = 200 mJ mol<SUP>-1</SUP> K<SUP>-2</SUP>). From XPS measurements, the Ce-contained sample (x ≤ 25) is in a hybridization state with conduction electrons (Kondo effect) at room temperature, although the Ce is trivalent, and the Kondo temperature is distributed over a wide temperature range.
Liberalization, Industrial Nationalism, and the Malaysian Automotive Industry
KAORU NATSUDA,NORIYUKI SEGAWA,JOHN THOBURN 연세대학교 동서문제연구원 2013 Global economic review Vol.42 No.2
This paper examines the attempts by Malaysia to foster production by national automotive producers in a global industry dominated by a small number of major multinationals. Despite the use of a wide range of industrial policies, both standard import-substituting ones and more targeted policies, the main national producer, Proton, has been unable successfully to enter the automotive global value chain. We argue that Malaysia is probably faced with a choice of accepting foreign majority ownership, as with its second national producer, Perodua, or reconciling itself to Proton lagging in both technology and marketing.
An integrated airborne gravity survey of an offshore area near the northern Noto Peninsula, Japan
Komazawa, Masao,Okuma, Shigeo,Segawa, Jiro Korean Society of Earth and Exploration Geophysici 2010 지구물리와 물리탐사 Vol.13 No.1
An airborne gravity survey using a helicopter was carried out in October 2008, offshore along the northern Noto Peninsula, to understand the shallow and regional underground structure. Eleven flight lines, including three tie lines, were arranged at 2 km spacing within 20 km of the coast. The total length of the flight lines was ~700 km. The Bouguer anomalies computed from the airborne gravimetry are consistent with those computed from land and shipborne gravimetry, which gradually decrease in the offshore direction. So, the accuracy of the airborne system is considered to be adequate. A local gravity low in Wajima Bay, which was already known from seafloor gravimetry, was also observed. This suggests that the airborne system has a structural resolution of ~2 km. Reduction of gravity data to a common datum was conducted by compiling the three kinds of gravity data, from airborne, shipborne, and land surveys. In the present study, we have used a solid angle numerical integration method and an iteration method. We finally calculated the gravity anomalies at 300 m above sea level. We needed to add corrections of 2.5 mGals in order to compile the airborne and shipborne gravity data smoothly, so the accuracy of the Bouguer anomaly map is considered to be nearly 2 mGal on the whole, and 5 mGals at worst in limited or local areas.
Kentaro Ohuchi,Naohisa Miyakoshi,Yuji Kasukawa,Toyohito Segawa,Hayato Kinoshita,Yoichi Shimada 대한골다공증학회 2015 Osteoporosis and Sarcopenia Vol.1 No.2
Objectives: Diabetes mellitus (DM) causes secondary osteoporosis, which reduces bone mineral density (BMD) and bone strength. Akita mice (AM) are DM model mice used to evaluate glucose metabolism. However, bone metabolism in AM remains unclear. The purpose of this study was to evaluate BMD, bone strength, and serum sclerostin levels in AM. Methods: Female AM and control mice (C57/BL/6NCrSlc; CM) were divided into four groups: (1) a CM group sacrificed at 14 (CM-14w; n ¼ 8) or (2) 18 weeks of age (CM-18w; n ¼ 6); and (3) an AM group sacrificed at 14 (AM-14w; n ¼ 9) or (4) 18 weeks of age (AM-18w; n ¼ 6). Blood glucose level, serum sclerostin level, total tibial BMD, and femoral shaft bone strength were evaluated at each time point. Results: Blood glucose levels were significantly higher in AM than in CM (p < 0.001). Serum sclerostin levels were significantly lower in AM- 18w than in CM-18w (p < 0.001). BMD was significantly lower in AM-14w than in CM-14w (p ¼ 0.004). Stiffness of the femoral shaft was significantly lower in AM-18w than in CM-14w (p ¼ 0.04). Body weight (r ¼ 0.608, p < 0.01) and maximum load (r ¼ 0.438, p < 0.05) were significantly positively correlated with serum sclerostin levels, while blood glucose levels showed a significant negative correlation (r¼?0.708, p < 0.01). Conclusions: AM showed decreased BMD and bone strength with lower levels of serum sclerostin than CM. © 2015 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/).