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Moriyama J, Ito T, Doi M, Seino K, Luong DH, Iwamoto A, Murakami H. Enhancing hospital quality management and patient safety in Vietnam: a technical assistance project utilizing online solutions during COVID-19 pandemic. Trop Med Health 2022; 50:45. [PMID: 35820964 PMCID: PMC9277891 DOI: 10.1186/s41182-022-00435-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 06/30/2022] [Indexed: 11/10/2022] Open
Abstract
Since 2015, the National Center for Global Health and Medicine in Japan has been conducting a technical assistance project for improving patient safety in Vietnamese hospitals. During the COVID-19 pandemic, the project conducted a patient safety training program utilizing online solutions for participants from Vietnam. This resulted in an increase in the number of participants, and ensured access from remote locations. The convenience of easy access from smartphones encouraged further participation. In addition to online training, the utilization of platforms such as Facebook, a common social networking service in Vietnam, contributed to the dissemination of good practices.
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Affiliation(s)
- Jun Moriyama
- Bureau of International Health Cooperation, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan.
| | - Tomoo Ito
- Bureau of International Health Cooperation, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan
| | - Masahiko Doi
- Bureau of International Health Cooperation, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan
| | - Kaori Seino
- Bureau of International Health Cooperation, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan
| | - Duong Huy Luong
- Quality Management Division, Medical Service Administration, Ministry of Health, Room 711, 138A Giangvo, Hanoi, 11155, Vietnam
| | - Azusa Iwamoto
- Bureau of International Health Cooperation, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan
| | - Hitoshi Murakami
- Bureau of International Health Cooperation, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan
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Seino K, Bechstedt F. Coverage-dependent geometries of nanowires on Ge(0 0 1)-Au surfaces: modification of trenches. J Phys Condens Matter 2016; 28:284005. [PMID: 27227337 DOI: 10.1088/0953-8984/28/28/284005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Despite intense research the microscopic atomic structure of Au-induced nanowires on Ge(0 0 1) substrates is still under discussion. We analyse a variety of structural models for Au-induced nanowires on the Ge(0 0 1) surface using first-principles calculations. Here we focus on subridge modifications at higher Au coverages and study geometries based on the giant missing row model with Ge-Ge dimers in the grooves between the nanowires due to replacing them by Ge-Au heterodimers or Au-Au homodimers. Stable geometries are predicted for higher Au coverages, which however have only a minor influence on the electronic structure. The findings are interpreted that the Au coverage and the actual geometry may vary in the various experiments according to the preparation conditions.
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Affiliation(s)
- Kaori Seino
- Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
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3
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Hötzel F, Seino K, Chandola S, Speiser E, Esser N, Bechstedt F, Pucci A. Metal-to-Insulator Transition in Au Chains on Si(111)-5×2-Au by Band Filling: Infrared Plasmonic Signal and Ab Initio Band Structure Calculation. J Phys Chem Lett 2015; 6:3615-3620. [PMID: 26722731 DOI: 10.1021/acs.jpclett.5b01530] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The Si(111)-5×2-Au surface is increasingly of interest because it is one of the rare atomic chain systems with quasi-one-dimensional properties. For the deposition of 0.7 monolayers of Au, these chains are metallic. Upon the evaporation of an additional submonolayer amount of gold, the surface becomes insulating but keeps the 5×2 symmetry. This metal-to-insulator transition was in situ monitored based on the infrared plasmonic signal change with coverage. The phase transition is theoretically explained by total-energy and band-structure calculations. Accordingly, it can be understood in terms of the occupation of the originally half-filled one-dimensional band at the Fermi level. By annealing the system, the additional gold is removed from the surface and the plasmonic signal is recovered, which underlines the stability of the metallic structure. So, recent results on the infrared plasmonic signals of the Si(111)-5 × 2-Au surface are supported. The understanding of potential one-dimensional electrical interconnects is improved.
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Affiliation(s)
- Fabian Hötzel
- Kirchhoff Institute for Physics, Heidelberg University , Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
| | - Kaori Seino
- Institute of Condensed Matter Theory and Solid State Optics, Friedrich Schiller University Jena , Max-Wien-Platz 1, 07743 Jena, Germany
| | - Sandhya Chandola
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Department Berlin, Schwarzschildstraße 8, 12489 Berlin, Germany
| | - Eugen Speiser
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Department Berlin, Schwarzschildstraße 8, 12489 Berlin, Germany
| | - Norbert Esser
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Department Berlin, Schwarzschildstraße 8, 12489 Berlin, Germany
| | - Friedhelm Bechstedt
- Institute of Condensed Matter Theory and Solid State Optics, Friedrich Schiller University Jena , Max-Wien-Platz 1, 07743 Jena, Germany
| | - Annemarie Pucci
- Kirchhoff Institute for Physics, Heidelberg University , Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
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4
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Hötzel F, Seino K, Huck C, Skibbe O, Bechstedt F, Pucci A. Metallic Properties of the Si(111) - 5 × 2 - Au Surface from Infrared Plasmon Polaritons and Ab Initio Theory. Nano Lett 2015; 15:4155-4160. [PMID: 25978621 DOI: 10.1021/acs.nanolett.5b01279] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The metal-atom chains on the Si(111) - 5 × 2 - Au surface represent an exceedingly interesting system for the understanding of one-dimensional electrical interconnects. While other metal-atom chain structures on silicon suffer from metal-to-insulator transitions, Si(111) - 5 × 2 - Au stays metallic at least down to 20 K as we have proven by the anisotropic absorption from localized plasmon polaritons in the infrared. A quantitative analysis of the infrared plasmonic signal done here for the first time yields valuable band structure information in agreement with the theoretically derived data. The experimental and theoretical results are consistently explained in the framework of the atomic geometry, electronic structure, and IR spectra of the recent Kwon-Kang model.
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Affiliation(s)
- Fabian Hötzel
- †Kirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
| | - Kaori Seino
- ‡Institute of Condensed Matter Theory and Solid State Optics, Friedrich Schiller University Jena, Max-Wien-Platz 1, 07743 Jena, Germany
| | - Christian Huck
- †Kirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
| | - Olaf Skibbe
- †Kirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
| | - Friedhelm Bechstedt
- ‡Institute of Condensed Matter Theory and Solid State Optics, Friedrich Schiller University Jena, Max-Wien-Platz 1, 07743 Jena, Germany
| | - Annemarie Pucci
- †Kirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
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Affiliation(s)
| | - C Green
- Washington State University; Pullman WA United States
| | - R Sides
- Washington State University; Pullman WA United States
| | - K Seino
- Washington State University; Pullman WA United States
| | - W Bayly
- Washington State University; Pullman WA United States
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Nasu M, Seino K, Tamura Y, Suzuki M, Iwabuchi Y, Maeda N, End M, Yamauchi F, Ohsawa M. Eicosapentaenoic acid restrains the development of the cardiovascular events independent of triglyceride and C-reactive protein reduction in Japanese hemodialysis patients. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht308.p1428] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Pichenda K, Nakamura K, Morita A, Kizuki M, Seino K, Takano T. Non-hospital DOT and early diagnosis of tuberculosis reduce costs while achieving treatment success. Int J Tuberc Lung Dis 2012; 16:828-34. [PMID: 22507700 DOI: 10.5588/ijtld.11.0688] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE 1) To evaluate the tuberculosis (TB) related financial burden of patients and health care providers over the course of diagnosis and treatment by choice of directly observed treatment (DOT); and 2) to examine treatment outcomes for different DOT programmes in Cambodia. SETTING AND DESIGN: Subjects were patients diagnosed with smear-positive pulmonary TB between July 2008 and January 2009 at 17 health facilities providing multiple DOT programmes. Treatment outcomes for the different DOT programmes as well as direct and indirect household costs and medical delivery costs for the treatment and care of 277 patients were examined. RESULTS Per patient costs of anti-tuberculosis treatment for patients with non-multidrug-resistant TB who did not have human immunodeficiency virus co-infection ranged from a high of US$1900 for in-patient DOT to a low of $395 for DOT provided at home. All costs among patients treated with hospital DOT were consistently higher than for those treated with non-hospital DOT. The percentage of treatment success was not significantly different between hospital and non-hospital DOT programmes (all >89%). CONCLUSION Non-hospital DOT programmes ease the financial burden on both patients and health care providers, while resulting in treatment success rates similar to those of hospital DOT.
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Affiliation(s)
- K Pichenda
- International Health Section, Division of Public Health, Graduate School of Tokyo Medical and Dental University, Tokyo, Japan
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8
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Seino K. Approach to new immune cell therapies in the age of regenerative medicine (LL3-5). Int Immunol 2010. [DOI: 10.1093/intimm/dxq206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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9
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Rios LMV, Sheu JJ, Day JF, Maruniak JE, Seino K, Zaretsky H, Long MT. Environmental risk factors associated with West Nile virus clinical disease in Florida horses. Med Vet Entomol 2009; 23:357-366. [PMID: 19941601 DOI: 10.1111/j.1365-2915.2009.00821.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The objective of this study was to examine the extrinsic risk factors of West Nile virus (WNV) clinical disease in Florida horses as established from confirmed and negative horses tested within the state from 2001 to 2003. An Arboviral Case Information Form (ACF) was submitted by a referring veterinarian at the time of testing to the Florida Department of Agriculture and Consumer Services on every horse suspected of a viral encephalitis in Florida. A follow-up survey that focused on arbovirus prevention and farm ecology was created and mailed to the owner of each tested horse. Data from the follow-up survey indicated peak WNV prevalence in the late summer months in Florida. Quarter horses were the most commonly affected breed. The WNV vaccine was highly protective and natural water on the property also had a protective association. Factors that increased the risk of WNV to horses were the use of fans and a stable construction of solid wood or cement. Some risk indicators were dead birds on the property and other ill animals on the property. Data from this retrospective study have helped identify factors associated with WNV transmission in equines in Florida. Horses that have not been vaccinated and show clinical signs of arboviral infection from June to November should be tested for WNV. Horses that have been vaccinated and show clinical signs should be tested when the vaccination was administered within 1 month or greater than 6 months prior to the onset of clinical symptoms associated with WN infection.
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Affiliation(s)
- L M V Rios
- Department of Entomology and Nematology, University of Florida, Gainesville, Florida 32611, USA.
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Abstract
Based on ab initio density functional theory we present electronic properties and the optical response for Si nanocrystals embedded in amorphous SiO(2) networks. Quasi-spherical dots with diameters from 0.8 to 1.6 nm are investigated. The results for Si nanocrystals embedded in SiO(2) are compared with corresponding results for hydrogenated Si nanocrystals of the same size. The calculations show the influence of the interface between nanocrystal and matrix on the electronic properties. The results are compared with recent experimental data and discussed in detail. As striking features, strong reductions of the gaps and their diameter variation are predicted due to the oxide presence. Electronic confinement mainly influences the absorption edge while at higher photon energies only broad peaks at almost fixed positions occur.
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Affiliation(s)
- K Seino
- Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität and European Theoretical Spectroscopy Facility (ETSF), Max-Wien-Platz 1, 07743 Jena, Germany.
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11
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Stekolnikov AA, Seino K, Bechstedt F, Wippermann S, Schmidt WG, Calzolari A, Nardelli MB. Hexagon versus trimer formation in in nanowires on Si(111): energetics and quantum conductance. Phys Rev Lett 2007; 98:026105. [PMID: 17358624 DOI: 10.1103/physrevlett.98.026105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2006] [Indexed: 05/14/2023]
Abstract
The structural and electronic properties of the quasi-one-dimensional In/Si(111) surface system are calculated from first principles. It is found that the symmetry lowering of the In chains is energetically favorable, provided neighboring nanowires are correlated, giving rise to a doubling of the surface unit cell both along and perpendicular to the chain direction. The recently suggested formation of hexagons within the In nanowires [C. González, F. Flores, and J. Ortega, Phys. Rev. Lett. 96, 136101 (2006)]--in clear contrast to the trimer formation proposed earlier-drastically modifies the electron transport along the In chains, in agreement with experiment.
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Affiliation(s)
- A A Stekolnikov
- Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany
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12
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Hahn PH, Schmidt WG, Seino K, Preuss M, Bechstedt F, Bernholc J. Optical absorption of water: coulomb effects versus hydrogen bonding. Phys Rev Lett 2005; 94:037404. [PMID: 15698323 DOI: 10.1103/physrevlett.94.037404] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2004] [Indexed: 05/24/2023]
Abstract
The optical spectrum of water is not well understood. For example, the main absorption peak shifts upwards by 1.3 eV upon condensation, which is contrary to the behavior expected from aggregation-induced broadening of molecular levels. We investigate theoretically the effects of electron-electron and electron-hole correlations, finding that condensation leads to delocalization of the exciton onto nearby hydrogen-bonded molecules. This reduces its binding energy and has a dramatic impact on the line shape. The calculated spectrum is in excellent agreement with experiment.
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Affiliation(s)
- P H Hahn
- Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany
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Ohtake A, Kocán P, Seino K, Schmidt WG, Koguchi N. Ga-rich limit of surface reconstructions on GaAs(001): atomic structure of the (4 x 6) phase. Phys Rev Lett 2004; 93:266101. [PMID: 15697992 DOI: 10.1103/physrevlett.93.266101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2004] [Indexed: 05/24/2023]
Abstract
The Ga-rich reconstruction of the GaAs(001) surface has been studied. Using scanning tunneling microscopy (STM), we have found the existence of a well-ordered (4 x 6) reconstruction under extreme Ga-rich conditions. A structure model, consisting of subsurface Ga-Ga dimers and surface Ga-As dimers, is proposed for the (4 x 6) surface. This model is found to be energetically favorable at the Ga-rich limit and agrees well with our experimental data from STM and reflection high-energy electron diffraction.
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Affiliation(s)
- Akihiro Ohtake
- National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan.
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14
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Totsuka E, Murata A, Nishimura A, Umehara M, Nara M, Ono H, Nozaki T, Takiguchi M, Wajima N, Takahashi K, Seino K, Narumi S, Hakamada K, Sasaki M. Attenuation of canine warm ischemic small bowel injury by novel combination of nitric oxide donor, FK409, and cytokine suppressive anti-inflammatory agent FR167653. Transplant Proc 2004; 36:1988-90. [PMID: 15518720 DOI: 10.1016/j.transproceed.2004.08.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Organ ischemia-reperfusion injury is caused by two consecutive steps, microcirculatory disturbance and neutrophil-endothelial cell interactions, which are caused by inflammatory cytokines. We examined the hypothesis that combination therapy with a donor (FK409) of nitric oxide, one of the potent mediators with diverse roles as a vosodilator and a platelet inhibitor, together with the cytokine suppressor agent (FR167653) attenuates warm ischemic injury in canine small bowel. Small bowel ischemia was initiated by clamping the superior mesenteric artery and vein. Animals were divided into two groups: a control group (n = 5) subjected to 2-hour small bowel ischemia only, and a combination therapy group (FK/FR group, n = 5) that received FK409 (300 mcg/kg/h) plus FR167653 (1 mg/kg/h) intravenously before and after the ischemic event. We evaluated animal survival, small bowel tissue blood flow, and enzyme release from the small bowel. All controls died from severe acidosis within 2 days and all the FK/FR animals survived 7 days (P < .05). The FK/FR group recovered more than 70% of blood flow immediately after the revascularization, while the flow was less than 40% among the controls. Serum creatine phosphokinase values in the control group after reperfusion were significantly higher than those in the FK/FR group. In conclusion improvement of the microcirculation by FK409 and inhibition of cytokine release by FR167653 together attenuated warm ischemic small bowel injury.
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Affiliation(s)
- E Totsuka
- Second Department of Surgery, Hirosaki University School of Medicine, Hirosaki, Japan.
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15
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Seino K, Schmidt WG, Bechstedt F. Energetics of Si(001) surfaces exposed to electric fields and charge injection. Phys Rev Lett 2004; 93:036101. [PMID: 15323837 DOI: 10.1103/physrevlett.93.036101] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2004] [Indexed: 05/24/2023]
Abstract
We perform density-functional calculations on the influence of external electric fields and electrons or holes injected into surface states on the relative stability of c(4x2) and p(2x2) reconstructed Si(001) surfaces. It is shown that an electric field parallel to the [001] direction or the insertion of electrons into surface states favors the formation of p(2x2) periodicities. Our results explain recent experimental studies reporting changes of surface reconstruction of Si and Ge(001) surfaces induced by the scanning tunneling microscope and the occurrence of p(2x2) reconstructions on (001) surfaces of n-doped Si.
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Affiliation(s)
- K Seino
- Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany.
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Preuss M, Schmidt WG, Seino K, Furthmüller J, Bechstedt F. Ground- and excited-state properties of DNA base molecules from plane-wave calculations using ultrasoft pseudopotentials. J Comput Chem 2004; 25:112-22. [PMID: 14634999 DOI: 10.1002/jcc.10372] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We present equilibrium geometries, vibrational modes, dipole moments, ionization energies, electron affinities, and optical absorption spectra of the DNA base molecules adenine, thymine, guanine, and cytosine calculated from first principles. The comparison of our results with experimental data and results obtained by using quantum chemistry methods show that in specific cases gradient-corrected density-functional theory (DFT-GGA) calculations using ultrasoft pseudopotentials and a plane-wave basis may be a numerically efficient and accurate alternative to methods employing localized orbitals for the expansion of the electron wave functions.
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Affiliation(s)
- M Preuss
- Friedrich-Schiller-Universität, Institut für Festkörpertheorie und Theoretische Optik, Max-Wien-Platz 1, 07743 Jena, Germany
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17
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Affiliation(s)
- K. Seino
- Institut für Festkörpertheorie und Theoretische Optik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
| | - W. G. Schmidt
- Institut für Festkörpertheorie und Theoretische Optik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
| | - M. Preuss
- Institut für Festkörpertheorie und Theoretische Optik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
| | - F. Bechstedt
- Institut für Festkörpertheorie und Theoretische Optik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
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18
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Seino K, Setoguchi Y, Ogino T, Kayagaki N, Akiba H, Nakano H, Taniguchi H, Takada Y, Yuzawa K, Todoroki T, Fukuchi Y, Yagita H, Okumura K, Fukao K. Protection against Fas-mediated and tumor necrosis factor receptor 1-mediated liver injury by blockade of FADD without loss of nuclear factor-kappaB activation. Ann Surg 2001; 234:681-8. [PMID: 11685033 PMCID: PMC1422094 DOI: 10.1097/00000658-200111000-00015] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
OBJECTIVE To investigate the role of FADD (Fas-associated protein with death domain) in Fas and tumor necrosis factor receptor 1 (TNFR1)-mediated hepatic injury and inflammatory response in vivo. SUMMARY BACKGROUND DATA Fas and TNFR1 are cell surface molecules that trigger apoptosis or inflammation on engagement by a specific ligand or antibody. FADD is recruited to the cytoplasmic domain of these receptors on their activation and works as a common mediator to induce apoptosis. It is known that a blockade of FADD can inhibit apoptosis mediated by Fas or TNFR1 in vitro. However, it is not known whether the blockade can prevent organ injury and whether the inflammatory cascade is affected in vivo. METHODS A FADD deletion mutant lacking the death effector domain was introduced into mice by transduction with an adenovirus vector, and the effect of this FADD dominant negative mutant was examined in several liver injury models. RESULTS Hepatic injury induced by anti-Fas monoclonal antibody or tumor necrosis factor (TNF)-alpha plus D-galactosamine was markedly ameliorated by the FADD dominant negative transduction, which abrogated the death rate. Further, the FADD dominant negative transduction efficiently blocked T cell- mediated concanavalin A-induced hepatitis while not affecting TNF-alpha production or TNF-alpha-induced nuclear factor-kappaB activation in the liver. CONCLUSIONS These results provide the basis for a novel therapeutic modality in which an unfavorable apoptotic process can be inhibited without affecting a favorable response for liver regeneration; this would be relevant to the clinical treatment of acute and chronic liver diseases as well as to some inflammatory disorders with hypercytokinemia, such as sepsis.
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Affiliation(s)
- K Seino
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, Tsukuba Science City, Japan.
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Umehara Y, Hakamada K, Seino K, Aoki K, Toyoki Y, Sasaki M. Improved survival and ammonia metabolism by intraperitoneal transplantation of microencapsulated hepatocytes in totally hepatectomized rats. Surgery 2001; 130:513-20. [PMID: 11562677 DOI: 10.1067/msy.2001.116929] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND We evaluated the effects of intraperitoneal transplantation of microencapsulated hepatocytes in a 3-stage total hepatectomy rat model. METHODS A new model of total hepatectomy was created as follows. First, the infrahepatic inferior vena cava was ligated just above the right renal vein. Seven days later, the portal vein was ligated and a portacaval shunt was established using a Teflon catheter over a venipuncture needle. Another 7 days later, total hepatectomy was completed by ligating and dividing the suprahepatic inferior vena cava, the hepatic artery, and the bile duct. Next, 4 x 10(7) hepatocytes (4% of the normal liver hepatocyte mass) isolated from male Wistar rats were microencapsulated within a collagen matrix enveloped by a 3-layer membrane of sodium alginate-poly-L-lysine-sodium alginate copolymer. Capsules containing hepatocytes (diameter, 500-800 microm) and empty capsules (control) were transplanted intraperitoneally 4 days before the total hepatectomy. Survival time and selected blood chemistry concentrations after the total hepatectomy were measured. The capsules were also examined histologically with hematoxylin and eosin staining and modified Gmelin's stain for bile pigments. RESULTS The survival time was greater in the rats given the microencapsulated hepatocytes than in the control rats (17.3 +/- 3 vs 3.7 +/- 0.1 hours; P <.01). The blood ammonia concentrations increased soon after total hepatectomy but remained significantly lower in the rats with microencapsulated hepatocytes (P <.05). The microcapsules contained numerous viable hepatocytes with abundant bile pigments and no lymphocytic infiltration. CONCLUSIONS Microencapsulated hepatocytes with an ultrathin polymer layer that protects them from inflammatory and lymphocytic reactions may facilitate their ability to function. In this study, 4 x 10(7) hepatocytes significantly prolonged the survival of rats that underwent hepatectomy and supported ammonia metabolism. Further development of this technique may permit its use in patients with hepatic failure.
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Affiliation(s)
- Y Umehara
- Second Department of Surgery, Hirosaki University School of Medicine, Hirosaki, Japan
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Tang W, Seino K, Ito M, Konishi T, Senda H, Makuuchi M, Kojima N, Mizuochi T. Requirement of ceramide for adhesion of Helicobacter pylori to glycosphingolipids. FEBS Lett 2001; 504:31-5. [PMID: 11522291 DOI: 10.1016/s0014-5793(01)02759-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Direct adhesion of Helicobacter pylori to immobilized glycosphingolipids (GSLs) was compared to that of their corresponding oligosaccharide-conjugated neoglycoconjugates in order to clarify the roles of the carbohydrate and lipid portions of GSLs in H. pylori adhesion. These bacteria were found to adhere to sulfatide, GM3, GalCer and LacCer, but not to ceramide, sphingomyelin, or polyacrylamides conjugated with beta-galactose, lactose, 3'-sialyllactose or 3'-sulfo-beta-galactose. Furthermore, neoglycolipids or bovine serum albumin derivatives with corresponding oligosaccharides were unable to serve as the ligands. H. pylori adhesion to GalCer with alpha-hydroxyl fatty acid was much stronger than GalCer with the non-hydroxyl fatty acid. These results suggest that H. pylori recognize the conformation of GSL with alpha-hydroxyl fatty acid on solid phase.
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Affiliation(s)
- W Tang
- Department of Applied Biochemistry, Tokai University, Hiratsuka, Kanagawa, Japan
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21
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Luo ML, Sakuragi N, Shimizu M, Seino K, Okamoto K, Kaneuchi M, Ebina Y, Okuyama K, Fujino T, Sagawa T, Fujimoto S. Prognostic significance of combined conventional and immunocytochemical cytology for peritoneal washings in endometrial carcinoma. Cancer 2001; 93:115-23. [PMID: 11309777 DOI: 10.1002/cncr.9017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Noncancerous cells simulating adenocarcinoma cells may interfere with the analysis of peritoneal cytology (PC) in patients with endometrial carcinoma. Immunocytochemistry (ICC) may improve the diagnosis of PC. METHODS PC slides from 115 patients with endometrial carcinoma were reviewed. Suspicious or positive cell clusters were recovered with a cell transfer method and were subjected to ICC for MOC-31, cytokeratin 5/6, and p53. Conventional Papanicolaou staining and ICC results were compared directly on the same cells. RESULTS By combined conventional and immunocytochemical PC (CONV-ICC-PC), cytodiagnosis was positive in 18 of 115 patients (15.7%) and suspicious in 3 of 115 patients (2.6%). According to a multivariate Cox regression analysis of patients with tumors confined to the uterus that included grade, myometrial invasion, cervical involvement, and CONV-ICC-PC, only CONV-ICC-PC was an independent prognostic factor (P < 0.05). A multivariate analysis for all of the patients studied that compared CONV-ICC-PC with staging variables revealed that only peritoneal metastasis (P < 0.0001) and lymph node metastasis (P < 0.01) were independent prognostic factors. When peritoneal metastases were excluded, CONV-ICC-PC (P < 0.01) and lymph node metastasis (P < 0.0025) were the independent prognostic factors. By cell transfer and p53 immunostaining in samples from 14 patients with malignant cells in their peritoneal washings, no deaths occurred among 5 patients with negative p53, whereas 5 of 9 patients with positive p53 died of disease at the time of data analysis. CONCLUSIONS MOC-31 immunostaining improves the diagnosis of PC in endometrial carcinoma. Positive PC is an important prognostic factor for patients with endometrial carcinoma confined to the uterus. The p53 positive cells in PC have possible prognostic significance.
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Affiliation(s)
- M L Luo
- Department of Obstetrics and Gynecology, Hokkaido University School of Medicine, Sapporo, Japan
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22
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Gu M, Takada Y, Fukunaga K, Ishiguro S, Taniguchi H, Seino K, Yuzawa K, Otsuka M, Todoroki T, Fukao K. Role of platelet-activating factor in hepatectomy with Pringle's maneuver. J Surg Res 2001; 96:233-8. [PMID: 11266278 DOI: 10.1006/jsre.2000.6067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Interruption of hepatic inflow is commonly used to reduce blood loss during extensive liver resection, but may cause liver dysfunction. The present study investigated the effects of platelet-activating factor (PAF) antagonist E5880 on total liver warm ischemia and 70% hepatectomy. METHODS Rabbits were used in this study and were divided into four groups: group 1, those treated with only 70% hepatectomy; group 2, those treated with only 20 min Pringle's maneuver; group 3, those treated with both Pringle's maneuver and 70% hepatectomy without pretreatment; and group 4, those pretreated with PAF antagonist E5880 (0.3 mg/kg) followed by Pringle's maneuver and 70% hepatectomy. The remnant liver function was then evaluated after reperfusion. RESULTS Seven-day survival rates in both groups 1 and 2 were 100%. E5880 treatment significantly increased 7-day survival rate (group 4: 38% vs group 3: 0%, P < 0.05) after a combination of Pringle's maneuver and 70% hepatectomy. The elevations of serum liver enzymes (GOT, GPT, mGOT, and LDH) were significantly inhibited in group 4 at 1 and 4 h after reperfusion. Portal venous pressure and the energy charge of liver were also significantly improved in group 4, compared with those in group 3. Endothelin-1 levels of arterial and portal venous blood progressively increased after reperfusion; however, there were no significant differences between the two groups. Leukocyte infiltration into the liver was significantly inhibited in group 4. CONCLUSION E5880 pretreatment has protective effects on liver function after 70% hepatectomy with Pringle's maneuver in rabbits.
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Affiliation(s)
- M Gu
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba City, Ibaraki, 305-8575, Japan
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23
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Affiliation(s)
- K Seino
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, Tsukuba-City, Japan
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24
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Gu M, Takada Y, Fukunaga K, Ishiguro S, Seino K, Taniguchi H, Yuzawa K, Otsuka M, Todoroki T, Fukao K. Improvement of graft function without donor pretreatment in liver transplantation from non-heart-beating donors. Transplant Proc 2001; 33:837-8. [PMID: 11267089 DOI: 10.1016/s0041-1345(00)02338-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- M Gu
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, 305-8575, Tsukuba City, Ibaraki, Japan
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25
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Takada Y, Otsuka M, Seino K, Taniguchi H, Koike N, Kawamoto T, Koda K, Adachi S, Yuzawa K, Nozue M, Todoroki T, Fukao K. Hepatic resection for metastatic tumors from noncolorectal carcinoma. Hepatogastroenterology 2001; 48:83-6. [PMID: 11269007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
BACKGROUND/AIMS The role of liver resection for hepatic metastases from noncolorectal carcinomas has yet to be clarified. The present study examines a single institutional experience of hepatic resection for noncolorectal metastases. METHODOLOGY From January 1987 to March 1999, 14 patients underwent curative resection for liver metastases from noncolorectal carcinomas. Records of these patients were reviewed. RESULTS Resections were performed for liver metastases from gastric cancers (n = 8), pancreatic cancers (n = 2), and cancers of bile duct, the papilla of Vater, kidney, and breast (n = 1, each). Six patients (5 with gastric cancers and 1 with pancreas cancer) presented with synchronous disease and 8 with metachronous disease. In the gastric cancer patients, there are 2 disease-free survivors (26 and 53 months) in the metachronous group, though all of the 5 patients with synchronous disease died within 29 months. All of the 4 patients with pancreatobiliary carcinomas died within 2 years. One case of breast cancer and another of renal cell cancer are alive without disease at 49 and 9 months, respectively. CONCLUSIONS For metastases from gastric cancers, better survival after hepatic resection is expected in metachronous cases than in synchronous cases. Hepatic resection may afford little benefit for patients with liver metastases from pancretobiliary cancers.
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Affiliation(s)
- Y Takada
- Department of Surgery, Institute of Clinical Medicine, Tsukuba University, Ten-nodai 1-1-1, Tsukuba, Ibaraki 305-8575, Japan
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Abstract
We recently experienced a rare case of chronic pancreatitis in a 13-year-old Japanese boy. Recently, in hereditary pancreatitis patients, some mutations have been identified in the trypsinogen gene. The purpose of this study was to investigate whether the same mutations could also be found in this patient. Polymerase chain reaction (PCR)-amplified products of his cationic and anionic trypsinogen genes were examined by direct sequence analysis. The gene analysis failed to show any mutation in any exons and their flanking intronic sequences of his trypsinogen genes. These findings indicate that the chronic calcifying pancreatitis in the present patient is "idiopathic", and thus a rare case of juvenile pancreatitis.
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Affiliation(s)
- K Seino
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, Tennodai, Tsukuba Science City, Japan
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27
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Suzuki A, Taniguchi H, Zheng YW, Takada Y, Fukunaga K, Seino K, Yazawa K, Otsuka M, Yoshiki A, Kusakabe M, Fukao K, Nakauchi H. Proliferative and functional ability of transplanted murine neonatal hepatocytes in adult livers. Transplant Proc 2000; 32:2370-1. [PMID: 11120204 DOI: 10.1016/s0041-1345(00)01703-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- A Suzuki
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan
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28
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Zheng YW, Taniguchi H, Suzuki A, Takada Y, Fukunaga K, Seino K, Yuzawa K, Otsuka M, Fukao K, Nakauchi H. Effects of combined growth factors on clonal growth and albumin secretion of murine fetal hepatocytes in low density culture. Transplant Proc 2000; 32:2372-3. [PMID: 11120205 DOI: 10.1016/s0041-1345(00)01704-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Y W Zheng
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
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29
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Takada Y, Fukunaga K, Mei G, Ishiguro S, Taniguchi H, Seino K, Yuzawa Y, Otsuka M, Fukao K. Porcine model of fulminant hepatic failure treated by liver transplantation. Transplant Proc 2000; 32:2243-4. [PMID: 11120150 DOI: 10.1016/s0041-1345(00)01652-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Y Takada
- Department of Surgery, Institute of Clinical Medicine, Tsukuba University Tennodai 1-1-1, Tsukuba City, Ibaraki, Japan.
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30
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Fukunaga K, Takada Y, Gu M, Ishiguro S, Seino K, Taniguchi H, Yuzawa K, Otsuka M, Goto K, Fukao K. Peri- and postoperative kinetics of endothelin-1/big endothelin-1 and effects of endothelin antagonist in porcine liver transplantation from non-heart-beating donors. Transplant Proc 2000; 32:1647-9. [PMID: 11119874 DOI: 10.1016/s0041-1345(00)01436-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- K Fukunaga
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan
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31
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Suzuki A, Taniguchi H, Zheng YW, Takada Y, Fukunaga K, Seino K, Yazawa K, Otsuka M, Fukao K, Nakauchi H. Clonal colony formation of hepatic stem/progenitor cells enhanced by embryonic fibroblast conditioning medium. Transplant Proc 2000; 32:2328-30. [PMID: 11120186 DOI: 10.1016/s0041-1345(00)01685-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- A Suzuki
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan
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32
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Otsuka M, Yuzawa K, Takada Y, Taniguchi H, Fukunaga K, Seino K, Todoroki T, Fukao K. Long-term graft survival of living-related kidneys after donor-specific transfusion. Transplant Proc 2000; 32:1741-2. [PMID: 11119914 DOI: 10.1016/s0041-1345(00)01428-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- M Otsuka
- University of Tsukuba, Ibaraki, Japan
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33
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Seino K, Tun T, Ohshima N, Hamada H, Yoshino K, Ikeda S, Fukunaga K, Taniguchi H, Takada Y, Yuzawa K, Otsuka M, Todoroki T, Fukao K. Inhibition of CD95 ligand-mediated inflammation. Transplant Proc 2000; 32:2038-9. [PMID: 11120056 DOI: 10.1016/s0041-1345(00)01548-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- K Seino
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan
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34
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Zheng YW, Taniguchi H, Suzuki A, Takada Y, Fukunaga K, Seino K, Yuzawa K, Otsuka M, Fukao K, Nakauchi H. Effects of four extracellular matrices associated with growth factors on clonal culture and proliferation of murine fetal hepatocytes. Transplant Proc 2000; 32:2498-9. [PMID: 11120265 DOI: 10.1016/s0041-1345(00)01765-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Y W Zheng
- Department of Surgery, Institute of Clinical Medicine, and University of Tsukuba, Tsukuba, Ibaraki, Japan
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35
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Gu M, Takada Y, Fukunaga K, Ishiguro S, Taniguchi H, Seino K, Yuzawa K, Otsuka M, Todoroki T, Fukao K. Pharmacologic graft protection without donor pretreatment in liver transplantation from non-heart-beating donors. Transplantation 2000; 70:1021-5. [PMID: 11045637 DOI: 10.1097/00007890-200010150-00006] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Non-heart-beating donors (NHBDs) are considered potential sources of transplant organs in an effort to alleviate the problem of donor shortage in clinical liver transplantation. We investigated the possibility of pharmacologic protection of hepatic allograft function from NHBDs without donor pretreatment. METHODS Orthotopic liver transplantation was performed using pigs. In donors, cardiac arrest was induced by stopping the respirator. Forty-five minutes after cessation of the respirator, the liver was flushed with cold lactated Ringer's solution including heparin and with the University of Wisconsin (UW) solution, and then preserved for 8 hr at 4 degrees C in the UW solution. The pigs were divided into two groups: a control group and a treated group. In the treated group, an endothelin antagonist TAK-044 was added to the UW solutions (10 mg/L), and TAK-044 (10 mg/kg body weight) and a platelet activating factor antagonist E5880 (0.3 mg/kg body weight) were also administered to the recipients. RESULTS TAK-044 and E5880 treatment significantly increased the 7-day survival rate of the recipients (100% vs. 17%, P<0.05). In the treated group, portal venous pressure immediately after reperfusion of the graft was significantly lower than in the control group, and postoperative increase in serum concentrations of glutamic oxaloacetic transaminase and total bilirubin was attenuated. Moreover, the energy charge and adenosine triphosphate concentration of the liver were rapidly restored after reperfusion. CONCLUSIONS Pharmacologic modulation with TAK-044 and E5880 avoiding donor pretreatment can improve the viability of hepatic allografts procured from NHBDs.
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Affiliation(s)
- M Gu
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan
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36
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Taniguchi H, Kondo R, Suzuki A, Zheng YW, Takada Y, Fukunaga K, Seino K, Yuzawa K, Otsuka M, Fukao K, Nakauchi H. Clonogenic colony-forming ability of flow cytometrically isolated hepatic progenitor cells in the murine fetal liver. Cell Transplant 2000; 9:697-700. [PMID: 11144968 DOI: 10.1177/096368970000900517] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Stem cells are defined as cells having multilineage differentiation potential and self-renewal capability. Hepatic stem cells have aroused considerable interest not only because of their developmental importance but also for their therapeutic potential. However, their presence in the liver has not yet been demonstrated. With the use of a fluorescence-activated cell sorter (FACS) and monoclonal antibodies, we attempted to ascertain whether hepatic stem cells are present in the murine fetal liver. For this purpose, we optimized a cell isolation technique for FACS sorting of fetal liver cells. When isolated CD45 TER119 cells (the non-blood cell fraction in the fetal liver) were tested for their clonogenic colony-forming ability, mechanical dissociation (pipetting) was the most suitable cell isolation technique for FACS sorting. We confirmed that these colonies contained not only cells expressing hepatocyte markers but also cells expressing cholangiocyte markers. To identify hepatic stem cells, studies must focus on CD45TER119- cells in the murine fetal liver.
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Affiliation(s)
- H Taniguchi
- Department of Surgery, Institute of Clonical Medicine, University of Tsukuba, Ibaraki, Japan.
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37
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Aoki K, Hakamada K, Umehara Y, Seino K, Itabashi Y, Sasaki M. Intraperitoneal transplantation of microencapsulated xenogeneic hepatocytes in totally hepatectomized rats. Transplant Proc 2000; 32:1118-20. [PMID: 10936388 DOI: 10.1016/s0041-1345(00)01153-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- K Aoki
- Department of Surgery, Hirosaki University School of Medicine, Hirosaki, Japan
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38
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Affiliation(s)
- Y Umehara
- Second Department of Surgery, Hirosaki University School of Medicine, Hirosaki, Japan
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39
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Tani A, Seino K. Effects of side cooling on temperature, humidity and water recycling efficiency in a culture vessel for a space experiment--results of ground experiment. Seibutsu Kankyo Chosetsu 2000; 38:79-87. [PMID: 12371436 DOI: 10.2525/ecb1963.38.79] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Seed-to-seed experiments using dwarf plants will be conducted in Cell Biology Experiment Facility (CBEF) set up in the International Space Station (ISS). Development of a simple system to recycle water transpired by plants is necessary to save space and electrical power. A cooling system using a cooling plate that cools one side of the ventilated culture vessel to enhance water vapor condensation was developed. Effects of side cooling on air temperature, relative humidity and water recycling efficiency in the culture vessel were investigated on the ground. Decreasing the cooling plate temperature lowered temperatures of cooled side and inside air. Cooling treatment also decreased relative humidity inside the vessel less than 90% and lowered the amount of water vapor lost from the vessel through ventilation filters. This seemed to be due to the increased water vapor condensation onto the cooled side. To investigate the effect of increases in outside humidity on water recycling efficiency in the culture vessel, a water vapor transfer model was established. The calculation results indicate that an increase in relative humidity around the vessel can decrease water vapor loss from the vessel, increase water condensation onto the cooled side, and therefore, enhance water recycling efficiency in the vessel. The side cooling system seems to be useful for the CBEF in ISS because relative humidity in the CBEF is controllable.
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Affiliation(s)
- A Tani
- School of High-Technology for Human Welfare, Tokai University, Numazu, Japan
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40
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Seino K, Yamauchi T, Ishibashi A, Tokuhara N, Kobayashi S, Fukunaga K, Taniguchi H, Takada Y, Yuzawa K, Otsuka M, Todoroki T, Fukao K. Prolongation of mouse skin allograft survival by novel agonists selective for retinoic acid receptor-alpha. Transplant Proc 2000; 32:257-8. [PMID: 10715409 DOI: 10.1016/s0041-1345(99)00949-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- K Seino
- Department of Surgery, University of Tsukuba School of Medicine, Tsukuba, Japan
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41
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Taniguchi H, Suzuki A, Zheng Y, Kondo R, Takada Y, Fukunaga K, Seino K, Yuzawa K, Otsuka M, Fukao K, Nakauchi H. Usefulness of flow-cytometric cell sorting for enrichment of hepatic stem and progenitor cells in the liver. Transplant Proc 2000; 32:249-51. [PMID: 10715407 DOI: 10.1016/s0041-1345(99)00947-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- H Taniguchi
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, Tsukuba Science-city, Ibaraki, Japan.
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42
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Takada Y, Fukunaga K, Gu M, Ishiguro S, Taniguchi H, Seino K, Yuzawa K, Otsuka M, Fukao K. Improvement of allograft viability with organs procured from non-heart-beating donors in porcine liver transplantation. Transplant Proc 2000; 32:277-8. [PMID: 10715416 DOI: 10.1016/s0041-1345(99)00956-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Y Takada
- Department of Surgery, Institute of Clinical Medicine, Tsukuba University, Tsukuba-city, Japan.
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43
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Tani A, Tahara N, Seino K, Kitaya Y, Saito T, Goto E, Takahashi H. [Development of plant growth chambers for the experiments under microgravity conditions (4)-results of two experiments for water circulation in parabolic flight]. Biol Sci Space 1999; 13:224-5. [PMID: 12533008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
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44
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Seino K, Ogino T, Fukunaga K, Taniguchi H, Takada Y, Yuzawa K, Otsuka M, Yagita H, Okumura K, Fukao K. Attempts to reveal the mechanism of CD95-ligand-mediated inflammation. Transplant Proc 1999; 31:1942-3. [PMID: 10455926 DOI: 10.1016/s0041-1345(99)00219-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- K Seino
- Department of Surgery, University of Tsukuba School of Medicine, Japan
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45
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Fukunaga K, Takada Y, Mei G, Taniguchi H, Seino K, Yuzawa K, Otsuka M, Todoroki T, Goto K, Fukao K. An endothelin receptor antagonist ameliorates injuries of sinusoid lining cells in porcine liver transplantation. Am J Surg 1999; 178:64-8. [PMID: 10456707 DOI: 10.1016/s0002-9610(99)00107-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND TAK-044 is an endothelin receptor antagonist. Whether the agent has protective effects on liver graft injuries from non-heart-beating donors is unknown. METHODS In donor pigs, cardiac arrest was induced by stopping the respirator. Forty-five minutes after cessation of the respirator, the liver was flushed with University of Wisconsin (UW) solution, preserved for 8 hours at 4 degrees C, and transplanted orthotopically. The pigs were divided into two groups: a control group and a drug-treated group in which TAK-044 was given in the UW solutions (10 mg/L) and was administered to recipients (10 mg/kg body weight). RESULTS TAK-044 treatment significantly increased recipient survival rate. After reperfusion of the graft, portal venous pressure and 15-minute retention rate of indocyanine green were significantly reduced in the drug-treated group. Electron microscopic findings indicated that TAK-044 attenuated endothelial cell injuries. CONCLUSION TAK-044 treatment improves the viability of livers harvested from non-heart-beating donors. The main effect of the agent is protection of endothelial cells from ischemia/reperfusion injuries.
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Affiliation(s)
- K Fukunaga
- Department of Surgery, Institute of Clinical Medicine, University of Tsukuba, Tsukuba City, Ibaraki, Japan
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Seino K, Kayagaki N, Yamaguchi N, Takada Y, Uyama S, Kiuchi T, Tanaka K, Yagita H, Okumura K, Fukao K. Soluble forms of CD95 and CD95 ligand after living related liver transplantation. Transplantation 1999; 67:634-6. [PMID: 10071041 DOI: 10.1097/00007890-199902270-00026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Soluble forms of CD95 and CD95 ligand (sCD95 and sCD95L, respectively) can increase in the serum of patients with some inflammatory disease. In this study, we investigated the serum levels of sCD95 and sCD95L in liver transplantation recipients. METHODS Serum levels of sCD95 and sCD95L in living related liver transplant recipients were analyzed by ELISA and their relation to the clinical findings estimated. RESULTS Serum samples from the recipients did not show detectable levels of sCD95L but showed significantly increased levels of sCD95. The increase of sCD95 was positively associated with that of total-bilirubin and incidence of rejection, infection, and graft ischemia. CONCLUSIONS The present results indicate an existence of sCD95 in the recipients of living related liver transplants. The increased serum levels of sCD95 may modify the immunological situation of the recipients after transplantation or represent the ongoing graft damage.
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Affiliation(s)
- K Seino
- Department of Surgery, University of Tsukuba School of Medicine, Ibaraki, Japan.
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Taniguchi H, Kondo R, Suzuki A, Zheng Y, Ito S, Takada Y, Fukunaga K, Seino K, Yuzawa K, Otsuka M, Fukao K, Yoshiki A, Kusakabe M, Nakauchi H. Evidence for the presence of hepatic stem cells in the murine fetal liver. Transplant Proc 1999; 31:454. [PMID: 10083186 DOI: 10.1016/s0041-1345(98)01704-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- H Taniguchi
- Department of Surgery, University of Tsukuba, Ibaraki, Japan.
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Seino K, Ogino T, Ju ST, Hamada H, Yagita H, Okumura K, Fukao K. Biological factors that affect CD95 ligand-mediated inflammation. Transplant Proc 1999; 31:893-5. [PMID: 10083393 DOI: 10.1016/s0041-1345(98)01824-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
MESH Headings
- Animals
- Antigens, Surface/genetics
- Antigens, Surface/immunology
- Fas Ligand Protein
- Inflammation/immunology
- Liver Neoplasms, Experimental/immunology
- Liver Neoplasms, Experimental/pathology
- Male
- Membrane Glycoproteins/genetics
- Membrane Glycoproteins/immunology
- Mice
- Mice, Inbred C3H
- Mice, Inbred C57BL
- Mice, Inbred MRL lpr
- Mice, Inbred Strains
- Neoplasm Transplantation
- Recombinant Proteins/immunology
- Transfection
- Transplantation, Homologous
- Transplantation, Isogeneic
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Affiliation(s)
- K Seino
- Department of Surgery, University of Tsukuba School of Medicine, Ibaraki, Japan
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Seino K, Iwabuchi K, Kayagaki N, Miyata R, Nagaoka I, Matsuzawa A, Fukao K, Yagita H, Okumura K. Chemotactic activity of soluble Fas ligand against phagocytes. J Immunol 1998; 161:4484-8. [PMID: 9794371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
A recombinant soluble form of human Fas ligand (sFasL) was tested for its chemotactic activity against human and mouse polymorphonuclear neutrophils (PMN) by the Boyden chamber method. sFasL exhibited a potent chemotactic activity against both human and mouse PMN and HL-60 cells when differentiated into neutrophils or monocytes. A neutralizing anti-FasL mAb abolished the chemotactic activity, while control mAb did not. Ligation of Fas by either IgM- or IgG-type anti-Fas mAb also induced PMN migration. PMN derived from lpr mice that express few Fas molecules did not respond to sFasL. In contrast, those derived from lpr(cg) mice that express Fas molecules with a mutated death domain normally responded to sFasL chemotaxis. These results directly indicated a chemotactic activity of sFasL against PMN and suggest a novel signaling function of Fas, which appears to be independent of the death domain-mediated apoptosis.
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Affiliation(s)
- K Seino
- Department of Immunology, Juntendo University School of Medicine, Tokyo, Japan.
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Allison J, Seino K, Yagita H. Can expression of CD95 (Fas/APO-1) ligand on grafts or tumor cells prevent their rejection? Springer Semin Immunopathol 1998; 19:311-22. [PMID: 9540159 DOI: 10.1007/bf00787228] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- J Allison
- Walter and Eliza Hall Institute of Medical Research, Royal Melbourne Hospital, Parkville, Australia
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