著者

Sato T. Matsui H. Takahashi T. Ding H. Yang H.-B. Wang S.-C. Fujii T. Watanabe T. Matsuda A. Terashima T. Kadowaki K.

出版者

American Physical Society

雑誌

Physical review letters (ISSN:00319007)

巻号頁・発行日

vol.91, no.15, pp.157003, 2003-10

被引用文献数

99 110

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We report a systematic high-resolution angle-resolved photoemission spectroscopy on high-Tc superconductors Bi2Sr2Can-1CunO2n+4 (n=1–3) to study the origin of many-body interactions responsible for superconductivity. For n=2 and 3, a sudden change in the energy dispersion, so called “kink”, becomes pronounced on approaching (π,0) in the superconducting state, while a kink appears only around the nodal direction in the normal state. For n=1, the kink shows no significant temperature dependence even across Tc. This could suggest that the coupling of electrons with Q=(π,π) magnetic mode is dominant in the superconducting state for multilayered cuprates, while the interactions at the normal state and that of single-layered cuprates have a different origin.

著者

Maclellan Philip C.

出版者

神戸女学院大学

雑誌

論集 (ISSN:03891658)

巻号頁・発行日

vol.48, no.3, pp.37-58, 2002-03

著者

Huré J.-M. Hersant F. Surville C. Nakai N. Jacq T.

出版者

EDP Sciences

雑誌

Astronomy and astrophysics (ISSN:00046361)

巻号頁・発行日

vol.530, pp.A145, 2011-06

被引用文献数

16 6

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We exploit our formula for the gravitational potential of finite size, power-law disks to derive a general expression linking the mass of the black hole in active galactic nuclei (AGN), the mass of the surrounding disk, its surface density profile (through the power index s), and the differential rotation law. We find that the global rotation curve v(R) of the disk in centrifugal balance does not obey a power law of the cylindrical radius R (except in the confusing case s = −2 that mimics a Keplerian motion), and discuss the local velocity index. This formula can help to understand how, from position-velocity diagrams, mass is shared between the disk and the black hole. To this purpose, we checked the idea by generating a sample of synthetic data with different levels of Gaussian noise, added in radius. It turns out that, when observations are spread over a large radial domain and exhibit low dispersion (standard deviation σ ≲ 10% typically), the disk properties (mass and s-parameter) and black hole mass can be deduced from a non linear fit of kinematic data plotted on a (R,Rv2)-diagram. For σ ≳ 10%, masses are estimated fairly well from a linear regression (corresponding to the zeroth-order treatment of the formula), but the power index s is no longer accessible. We have applied the model to 7 AGN disks whose rotation has already been probed through water maser emission. For NGC 3393 and UGC 3789, the masses seem well constrained through the linear approach. For IC 1481, the power-law exponent s can even be deduced. Because the model is scale-free, it applies to any kind of star/disk system. Extension to disks around young stars showing deviation from Keplerian motion is thus straightforward.

著者

C. リード [著] 彌永健一訳

出版者

岩波書店

巻号頁・発行日

2010

著者

Brian M Strem Kevin C Hicok Min Zhu Isabella Wulur Zeni Alfonso Ronda E Schreiber John K Fraser Marc H Hedrick

出版者

The Keio Journal of Medicine

雑誌

The Keio Journal of Medicine (ISSN:00229717)

巻号頁・発行日

vol.54, no.3, pp.132-141, 2005 (Released:2006-06-20)

参考文献数

108

被引用文献数

370 719 692

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Tissue engineering offers considerable promise in the repair or replacement of diseased and/or damaged tissues. The cellular component of this regenerative approach will play a key role in bringing these tissue engineered constructs from the laboratory bench to the clinical bedside. However, the ideal source of cells still remains unclear and may differ depending upon the application. Current research for many applications is focused on the use of adult stem cells. The properties of adult stem cells that make them well-suited for regenerative medicine are (1) ease of harvest for autologous transplantation, (2) high proliferation rates for ex vivo expansion and (3) multilineage differentiation capacity. This review will highligh the use of adipose tissue as a reservoir of adult stem cells and draw conclusions based upon comparisons with bone marrow stromal cells.

著者

Uedono A. Shaoqiang C. Jongwon S. Ito K. Nakamori H. Honda N. Tomita S. Akimoto K. Kudo H. Ishibashi S.

出版者

American Institute of Physics

雑誌

Journal of applied physics (ISSN:00218979)

巻号頁・発行日

vol.103, no.10, pp.104505, 2008-08

被引用文献数

22 27

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A relationship between intra-4f transitions of Er and vacancy-type defects in Er-doped GaN was studied by using a monoenergetic positron beam. Doppler broadening spectra of the annihilation radiation were measured for Er-doped GaN grown by molecular beam epitaxy. A clear correlation between the defect concentration and the photoluminescence (PL) intensity was observed. The major defect species detected by positrons was identified as a Ga vacancy VGa, and its concentration increased with increasing Er concentration [Er]. For the sample with [Er]=3.3 at. %, the maximum integrated intensity of PL was observed. The VGa concentration was above 1018 cm−3 and additional vacancies such as divacancies started to be introduced at this Er concentration. For the sample with higher [Er], the PL intensity decreased, and the mean size of vacancies decreased due to an introduction of precipitates and/or metastable phases.

著者

Leiner Johannes Saleem Sajid Fenton J. C. Yamamoto Takashi Kadowaki Kazuo Warburton P. A.

出版者

American Institute of Physics

雑誌

Applied physics letters (ISSN:00036951)

巻号頁・発行日

vol.95, no.25, pp.252505, 2009-12

被引用文献数

2 2

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We have measured the response of an array of Bi2Sr2CaCu2O8+delta intrinsic Josephson junctions to irradiation at 3 GHz. By measuring the dependence of the switching current upon the radio-frequency current for five of the junctions in the array we show quantitatively that the junctions have identical impedances at 3 GHz, this impedance being given by the inverse of the slope of the current-voltage characteristics.

著者

Ko J.-H. Kojima S. Koo T.-Y. Jung J. H. Won C. J. Hur N. J.

出版者

American Institute of Physics

雑誌

Applied physics letters (ISSN:00036951)

巻号頁・発行日

vol.93, no.10, pp.102905, 2008-09

被引用文献数

69 45

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A strong relaxation mode was observed in the paraelectric phase of barium titanate (BaTiO3) single crystals by Brillouin scattering study and was found to correlate with the softening of the longitudinal acoustic mode and the increase in the hypersonic damping. These observations support the existence of polar percursors and their electrostrictive coupling with the strain caused by the acoustic waves, consistent with former studies evidencing off-centered Ti ions in the high-symmetry cubic phase. A critical slowing down has been clearly observed in the vicinity of the cubic-tetragonal phase transition, indicating order-disorder component contributes to the phase transition of BaTiO3.

著者

Franklin C. Shontz

出版者

Macmillan

巻号頁・発行日

1975

著者

斎藤 尚生 三澤 浩昭 佐藤 夏雄 赤祖父 俊一 Sun W. Deehr C. S.

出版者

国立極地研究所

雑誌

南極資料 (ISSN:00857289)

巻号頁・発行日

vol.53, no.3, pp.233-258, 2009-11-30

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地磁気嵐とその発生起源である太陽現象をペアとして捉える太陽・地球電磁関係物理学の手法に従い,従来のフレア型急始(Sc)嵐,コロナホール型緩始(Sg)嵐,フィラメント消失型Sc嵐のほかに,本研究では新たに次のような赤道横断磁気ループ型Sc嵐が見出された. 太陽の赤道を跨ぐ大きな磁気ループ(Transequatorial loop:TELと略称)が急激に膨張,爆発して,大規模なコロナ質量放出(CME)を発生させる事実は半世紀以上前から観測され,太陽のふち(limb)現象として,太陽物理学分野で大きく注目されてきた.このTEL型爆発は太陽のふち(limb)で頻繁に観測されるからには,太陽正面でも発生するはずであると推定して調べたところ,ディスク中心付近でかすかな線条構造が認められてから数日後に,地球で磁気嵐が発生していることが見出された.この線条付近ではフレアもフィラメントもコロナホールも認められなかったことから,これは新しいTEL型Sc嵐であると認定した.このようなTELは南北両半球にある黒点群または黒点消滅後の残留磁域とつながっているので,磁気ループの軸磁場の方向が求められる.この軸磁場は惑星間磁場(IMF)の強いBz成分を生むので,その地磁気嵐構成への影響について調べた.TEL型Sc嵐については,将来様々な興味深い研究成果が期待されるが,現時点で考えられる様々な課題についての提言がなされた.

著者

Nagao M Iso H Yamagishi K Date C Tamakoshi A the JACC Study Group

出版者

Nature Publishing Group

雑誌

European journal of clinical nutrition (ISSN:09543007)

巻号頁・発行日

vol.66, no.6, pp.687-693, 2012-06

被引用文献数

60

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BACKGROUND/OBJECTIVES:Although high or low (no) meat consumption was associated with elevated or reduced mortality from cardiovascular disease, respectively, few studies have investigated the association between moderate meat consumption and cardiovascular disease. We aimed to evaluate the associations between moderate meat consumption and cardiovascular disease mortality.SUBJECTS/METHODS:We conducted a prospective cohort study of 51,683 Japanese (20,466 men and 31,217 women) aged 40-79 years living in all of Japan (The Japan Collaborative Cohort Study; JACC Study). Consumptions of meat (beef, pork, poultry, liver and processed meat) were assessed via a food frequency questionnaire administrated at baseline survey. Hazard ratios (HRs) of mortality from cardiovascular disease were estimated from Cox proportional hazards regression models according to quintiles of meat consumption after adjustment for potential confounding variables.RESULTS:During 820,076 person-years of follow-up, we documented 2685 deaths due to total cardiovascular disease including 537 ischemic heart diseases and 1209 strokes. The multivariable HRs (95% confidence interval) for the highest versus lowest quintiles of meat consumption (77.6 versus 10.4 g/day) among men were 0.66 (0.45-0.97) for ischemic heart disease, 1.10 (0.84-1.43) for stroke and 1.00 (0.84-1.20) for total cardiovascular disease. The corresponding HRs (59.9 versus 7.5 g/day) among women were 1.22 (0.81-1.83), 0.91 (0.70-1.19) and 1.07 (0.90-1.28). The associations were similar when the consumptions of red meat, poultry, processed meat and liver were examined separately.CONCLUSION:Moderate meat consumption, up to ~100 g/day, was not associated with increased mortality from ischemic heart disease, stroke or total cardiovascular disease among either gender.

著者

edited by A.P.M.H. Lardinois M.G.M. van der Poel V.J.C. Hunink

出版者

Brill

巻号頁・発行日

2006

著者

Mengsu Yang Richard Y. C. Kong Najam Kazmi Andrew K. C. Leung

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.27, no.3, pp.257-258, 1998 (Released:2003-02-28)

参考文献数

10

被引用文献数

18

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Glass slides and silicon chips were modified with aminosilane and various linker molecules to provide activated surfaces for covalent immobilization of oligonucleotides under ambient condition, and the surface-attached oligonucleotides remain active for solid-phase DNA hybridization and polymerase chain reaction.

著者

Iamblichus translated with an introduction and notes by Emma C. Clarke John M. Dillon and Jackson P. Hershbell

出版者

Brill

巻号頁・発行日

2004

著者

菅原 明喜 西山 實 草間 薫 茂呂 周 西村 敏 工藤 逸郎 CHOW Laurence C. 高木 章三

出版者

一般社団法人日本歯科理工学会

雑誌

Dental Materials Journal (ISSN:02874547)

巻号頁・発行日

vol.11, no.1, pp.11-16, 111, 1992-06-25

被引用文献数

16 63

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Calcium Phosphate Cement(CPC)は,水の介在下において常温で短時間のうちにHydroxyapatite(HAp)に転化することが知られており,臨床的な報告もいくつかなられている。今回は,根管充填用に開発された数種のCPCペーストの生体親和性についてラットを用いた組織反応試験を行い,市販根管充填材料と比較することによって検討を行った。 その結果,CPCをベースとした各種試作根管充填材料は,市販のものと比較して極めて良好な生体親和性を示し,HApそのものと比較しても組織反応における明確な違いはなかった。今回使用した市販の根管充填材料は,既に臨床で広く用いられ充分な評価を得ているものばかりなので,本材料も臨床に応用し得るものであることが示唆された。

著者

Kristine C. Harper

出版者

MIT Press

巻号頁・発行日

2008

著者

Claudine A Feio Maria C Izar Silvia S Ihara Soraia H Kasmas Celma M Martins Max N Feio Luís A Maués Ney C Borges Ronilson A Moreno Rui M Póvoa Francisco A Fonseca

出版者

一般社団法人 日本動脈硬化学会

雑誌

Journal of Atherosclerosis and Thrombosis (ISSN:13403478)

巻号頁・発行日

vol.19, no.3, pp.237-245, 2012 (Released:2012-03-26)

参考文献数

29

被引用文献数

10 32

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Aim: Euterpe Oleracea (açai) is a fruit from the Amazon region whose chemical composition may be beneficial for individuals with atherosclerosis. We hypothesized that consumption of Euterpe Oleracea would reduce atherosclerosis development by decreasing cholesterol absorption and synthesis.Methods: Male New Zealand rabbits were fed a cholesterol-enriched diet (0.5%) for 12 weeks, when they were randomized to receive Euterpe Oleracea extract (n = 15) or water (n = 12) plus a 0.05% cholesterol-enriched diet for an additional 12 weeks. Plasma phytosterols and desmosterol were determined by ultra-performance liquid chromatography and mass spectrometry. Atherosclerotic lesions were estimated by computerized planimetry and histomorphometry.Results: At sacrifice, animals treated with Euterpe Oleracea had lower levels of total cholesterol (p =0.03), non-HDL-cholesterol (p = 0.03) and triglycerides (p = 0.02) than controls. These animals had smaller atherosclerotic plaque area in their aortas (p = 0.001) and a smaller intima/media ratio (p = 0.002) than controls, without differences in plaque composition. At the end of the study, campesterol, β-sitosterol, and desmosterol plasma levels did not differ between groups; however, animals treated with Euterpe Oleracea showed lower desmosterol/campesterol (p = 0.026) and desmosterol/ β-sitosterol (p =0.006) ratios than controls.Conclusions: Consumption of Euterpe Oleracea extract markedly improved the lipid profile and attenuated atherosclerosis. These effects were related in part to a better balance in the synthesis and absorption of sterols.

著者

Rômulo D. NOVAES Reggiani V. GONÇALVES Maria do Carmo G. PELUZIO Antônio J. NATALI Izabel R. S. C. MALDONADO

出版者

(社)日本農芸化学会

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.76, no.5, pp.1025-1027, 2012-05-23 (Released:2012-05-23)

参考文献数

20

被引用文献数

4 3

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3,4-Dihydroxycinnamic acid (3,4-DA) is a natural compound with high antioxidant potential found in various foods. This study found that animals administered with 3,4-DA had higher exercise tolerance, reduced blood lactate, and markers of hepatic oxidation. Blood glucose and antioxidant enzymes were not affected by this treatment. 3,4-DA may have applicability in reducing the fatigue associated with exercise.

著者

C.Tobias[作詞]

出版者

ビクター

巻号頁・発行日

1936-06

著者

Elizabeth L. HOMMEL Gang MA Heather C. ALLE

出版者

(社)日本分析化学会

雑誌

Analytical Sciences (ISSN:09106340)

巻号頁・発行日

vol.17, no.11, pp.1325-1329, 2001 (Released:2005-04-20)

参考文献数

32

被引用文献数

22 45

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An important advance in surface science has been the evolution of sum frequency generation to the application of studying surface structure and chemistry of liquid surfaces at the molecular-level by probing the vibrational signatures of surface molecules. Recently, broad-bandwidth sum frequency generation (BBSFG) spectroscopy has become an important tool for investigating gas-solid interfaces. BBSFG spectroscopy allows, theoretically, a surface sum frequency spectrum to be acquired within one pulse of the laser. In this paper, the viability of BBSFG to study inherently small nonlinear response interfaces and the time-resolving capability of this surface-selective technology are demonstrated. Presented here are the first published accounts of spectra from a liquid surface utilizing the broad-bandwidth sum frequency technology with acquisition times as low as 500 milliseconds.