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Nakano E, Koyama S, Imai M, Machida Y, Sakanoue T, Nakahara T, Yaguchi Y, Tamai K, Ohkusu K. [Comparative Study of Rapid Antigen Test Reagents for Group A Streptococcus spp]. Rinsho Biseibutshu Jinsoku Shindan Kenkyukai Shi 2022; 32:1-11. [PMID: 36560902] [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: 06/17/2023]
Abstract
We compared rapid antigen detection kits widely used for the rapid diagnosis of group A streptococcal pharyngitis, evaluating their minimum detection sensitivity and operability in five levels. Five kits based on the immunochromatographic method were used: ImunoAce Strep A (Tauns), ImunoAce Strep A Neo (Tauns), Quick Navi-StrepA2 (Denka), Quick Vue Dipstick Strep A (SB Bioscience) and RapidTesta Strep A (SEKISUI MEDICAL). Thirteen strains were tested: 10 clinical isolates of Streptococcus pyogenes, 2 strains of Streptococcus dysgalactiae subsp. equisimilis (SDSE), and S. pyogenes ATCC 19615. All kits had the same or higher minimum detection sensitivity than previously reported. ImunoAce StrepA Neo had the highest detection sensitivity and the best overall evaluation among the group A streptococcal rapid antigen detection kits used in this study. The detection sensitivity of SDSE with group A polysaccharide antigen was comparable to that of S. pyogenes. Although culture tests are necessary to confirm the causative organism, SDSE may present with clinical symptoms similar to those of S. pyogenes, and detection with a rapid antigen detection kit may be of therapeutic value.
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Ichimura T, Nomura H, Shimizu H, Machida Y, Suzuki K. Cost-effectiveness of primary prophylaxis of febrile neutropenia with pegfilgrastim in docetaxel, cisplatin and 5-fluorouracil therapy for esophageal cancer. Pharmazie 2021; 76:450-454. [PMID: 34481537 DOI: 10.1691/ph.2021.1031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 09/29/2022]
Abstract
Objective: The efficacy of docetaxel, cisplatin, and 5-fluorouracil (DCF) therapy in treating esophageal cancer has been reported. However, febrile neutropenia (FN) is a potentially serious adverse event of DCF therapy with an incidence of 10 to 40%. Pegfilgrastim, a granulocyte colony-stimulating factor (G-CSF), has been shown to have a primary prophylactic role in FN. However, it has been suggested that excessive use of expensive G-CSF should be avoided. Therefore, we performed a cost-utility analysis of primary prophylaxis with pegfilgrastim. Design: Cost-effectiveness analysis using decision tree modelling. Methods: We used a decision tree analysis model based on the report of primary prophylaxis with pegfilgrastim. Based on a previous study, the FN incidence rate was set at 40.0% (95% confidence interval (CI): 11.9-68.1) for the pegfilgrastim group and 43.5% (95%CI: 21.6-65.4) for the no pegfilgrastim group. The FN treatment cost was US$726.63, and the duration of FN was 3.65±1.20 days. The utility value of patients who received DCF therapy was 0.643, and the change in utility value at FN onset was -0.15. Expected cost, quality-adjusted life year (QALY), and incremental cost-effectiveness ratio (ICER) were calculated, and cost-utility analysis was performed. Results: The ICER of pegfilgrastim was 184,976.75 USD/QALY. As a result of sensitivity analysis, the utility of FN had the greatest impact on the cost-effectiveness analysis, followed by the drug cost of pegfilgrastim. Conclusion: Primary prophylaxis of FN with pegfilgrastim might not be cost-effectiveness. In determining whether to administer pegfilgrastim it is necessary to consider patient factors, not just the incidence of FN.
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Affiliation(s)
- T Ichimura
- Department of Hospital Pharmaceutics, School of Pharmacy, Showa University, Japan
| | - H Nomura
- Department of Date Science/Pharmacy, National Cancer Center Hospital East, Japan
| | - H Shimizu
- Department of Pharmacy, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, Japan; Department of Nursing, School of Nursing and Rehabilitation Sciences, Showa University, Japan
| | - Y Machida
- Department of Pharmacy, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, Japan; Department of Nursing, School of Nursing and Rehabilitation Sciences, Showa University, Japan
| | - K Suzuki
- Division of Applied Pharmaceutical Education and Research, Hoshi University, Tokyo, Japan;,
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Michishita M, Ishizaki Y, Konnai M, Machida Y, Nakahira R, Hatakeyama H, Yoshimura H, Yamamoto M, Soeta S, Ochiai K, Misawa K, Yugeta N, Azakami D. Primary Lymphangiosarcoma of the Urinary Bladder in a Dog. J Comp Pathol 2020; 179:31-35. [PMID: 32958144 DOI: 10.1016/j.jcpa.2020.06.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 05/21/2020] [Accepted: 06/24/2020] [Indexed: 11/18/2022]
Abstract
Abdominal ultrasonographical and computed tomography examinations of a 12-year-old neutered female toy poodle revealed a protruding mass, approximately 2 cm in diameter, at the apex of the bladder. The mass was firm and haemorrhagic with a homogeneously brownish-yellow cut surface. Microscopically, it was unencapsulated and located in the muscle layer with invasion of the extra-muscular layer. It was composed of spindloid to oval neoplastic cells that formed irregular clefts and diffuse sheets that dissected bundles of collagen. Immunohistochemically, the neoplastic cells were positive for vimentin and lymphatic vessel endothelial hyaluronan receptor 1 antigens, but negative for cytokeratin AE1/AE3, factor VIII-related antigen, CD31, CD34, Prox-1, S100, desmin, α-smooth muscle actin and MyoD1. Negative immunolabelling for laminin antigen supported the absence of evidence of a basal lamina on ultrastructural examination. Based on these findings, this tumour was identified as a lymphangiosarcoma. To the best of our knowledge, this case is the first report of lymphangiosarcoma arising from the bladder in a dog.
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Affiliation(s)
- M Michishita
- Department of Veterinary Pathology, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Tokyo, Japan.
| | - Y Ishizaki
- Department of Veterinary Pathology, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - M Konnai
- Department of Veterinary Pathology, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - Y Machida
- Department of Veterinary Pathology, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - R Nakahira
- Department of Veterinary Pathology, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - H Hatakeyama
- Laboratory of Comparative Cellular Biology, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - H Yoshimura
- Department of Applied Science, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - M Yamamoto
- Department of Applied Science, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - S Soeta
- Department of Veterinary Anatomy, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - K Ochiai
- Department of Basic Science, School of Veterinary Medicine, Nippon Veterinary and Life Science University
| | | | | | - D Azakami
- Laboratory of Veterinary Clinical Oncology, Tokyo University of Agriculture and Technology, Tokyo, Japan
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Machida Y, Fukuma E. Magnetic Resonance Imaging And Other Imaging Modalities Before And After Breast Cryosurgery. Cryobiology 2020. [DOI: 10.1016/j.cryobiol.2019.11.023] [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: 10/24/2022]
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Matsunaga H, Machida Y, Nakagawa M, Yamaguchi M, Ogawara Y, Shima Y, Yamagata K, Katsumoto T, Hattori A, Itoh M, Seki T, Nishiya Y, Nakamura K, Suzuki K, Imaoka T, Suzuki M, Sampetrean O, Saya H, Ichimura K, Kitabayashi I. Characterization of a novel BBB-permeable mutant IDH1 inhibitor, DS-1001b. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz243.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Michishita M, Fujiwara-Igarashi A, Suzuki S, Hatakeyama H, Machida Y, Yoshimura H, Yamamoto M, Azakami D, Ochiai K, Ishiwata T, Fujita M. Diffuse Pulmonary Meningotheliomatosis with Sarcomatous Transformation in a Shiba Dog. J Comp Pathol 2019; 171:1-5. [PMID: 31540619 PMCID: PMC7094254 DOI: 10.1016/j.jcpa.2019.06.005] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Revised: 06/18/2019] [Accepted: 06/24/2019] [Indexed: 11/17/2022]
Abstract
A 2-year-old neutered female Shiba dog exhibited laboured breathing for 1 month. Computed tomography of the thoracic cavity revealed multiple nodules (2-5 mm diameter) in the lungs. Grossly, the lungs were firm and normal in shape. The nodules were grey-white in colour. Microscopically, the nodules were non-encapsulated and exhibited an irregular shape. They were composed of polygonal or spindle cells with indistinct cell borders arranged in sheets. The cells had large, round, hyperchromatic nuclei and abundant pale eosinophilic cytoplasm with no atypia. Intrapulmonary arterial emboli and infiltration into the bronchioles were observed. Immunohistochemically, the cells were positive for vimentin and negative for cytokeratin, glial fibrillary acidic protein and α-smooth muscle actin. Ultrastructurally, the cells displayed cytoplasmic processes, desmosomes and intermediate filaments. These findings led to a diagnosis of diffuse pulmonary meningotheliomatosis with sarcomatous transformation. To the best of our knowledge, this is the first report of diffuse pulmonary meningotheliomatosis in a dog.
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Affiliation(s)
- M Michishita
- Department of Veterinary Pathology, School of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Tokyo.
| | - A Fujiwara-Igarashi
- Division of Veterinary Radiology, School of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Tokyo
| | - S Suzuki
- Division of Veterinary Surgery, School of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Tokyo
| | - H Hatakeyama
- Laboratory of Comparative Cellular Biology, School of Veterinary Medicine, School of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Tokyo
| | - Y Machida
- Department of Veterinary Pathology, School of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Tokyo
| | - H Yoshimura
- Department of Applied Science, School of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Tokyo
| | - M Yamamoto
- Department of Applied Science, School of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Tokyo
| | - D Azakami
- Department of Veterinary Nursing, School of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Tokyo
| | - K Ochiai
- Department of Basic Science, School of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Japan
| | - T Ishiwata
- Division of Aging and Carcinogenesis, Research Team for Geriatric Pathology, Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | - M Fujita
- Division of Veterinary Radiology, School of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Tokyo
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Ishiguro Y, Kuroki T, Eguchi H, Machida Y, Hattori N, Miwa H. Pseudogout as a complication of acute ischemic stroke. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3682] [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: 10/18/2022]
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Hayashi Y, Ishii Y, Nagasawa J, Arai S, Okada H, Ohmi F, Umetsu T, Machida Y, Kurasawa K, Takemasa A, Suzuki S, Senoh T, Sada T, Hirata K. Subacute sarcoid myositis with ocular muscle involvement; a case report and review of the literature. Sarcoidosis Vasc Diffuse Lung Dis 2016; 33:297-301. [PMID: 27758998] [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] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Accepted: 02/17/2016] [Indexed: 06/06/2023]
Abstract
Sarcoidosis is a chronic granulomatous disease that can affect multiple organs. The lungs, eyes, and skin are known to be highly affected organs in sarcoidosis. There have been reports based on random muscle biopsy that 32-80% of systemic sarcoidosis comprises noncaseating granulomas; however, muscle involvement in sarcoidosis is generally asymptomatic and has an unknown frequency. We describe a case of acute to subacute sarcoid myositis of the skeletal and extraocular muscles. Typical ophthalmic involvement (manifested by infiltration of the ocular adnexa, intraocular inflammation, or infiltration of the retrobulbar visual pathways) and extraocular sarcoid myositis (as with the present case) is infrequently reported. It is important to keep in mind the rare yet perhaps underestimated entity of sarcoid myositis, and to utilize muscle biopsy and imaging tests for appropriate diagnosis and management of patients with sarcoidosis.
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Taupin M, Knebel G, Matsuda TD, Lapertot G, Machida Y, Izawa K, Brison JP, Flouquet J. Thermal Conductivity through the Quantum Critical Point in YbRh_{2}Si_{2} at Very Low Temperature. Phys Rev Lett 2015; 115:046402. [PMID: 26252699 DOI: 10.1103/physrevlett.115.046402] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Indexed: 06/04/2023]
Abstract
The thermal conductivity of YbRh_{2}Si_{2} has been measured down to very low temperatures under field in the basal plane. An additional channel for heat transport appears below 30 mK, both in the antiferromagnetic and paramagnetic states, respectively, below and above the critical field suppressing the magnetic order. This excludes antiferromagnetic magnons as the origin of this additional contribution to thermal conductivity. Moreover, this low temperature contribution prevails a definite conclusion on the validity or violation of the Wiedemann-Franz law at the field-induced quantum critical point.
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Affiliation(s)
- M Taupin
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
| | - G Knebel
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
| | - T D Matsuda
- Advanced Science Research Center, JAEA, Tokai, Ibaraki 319-1195, Japan
- Department of Physics, Tokyo Metropolitan University 1-1 Minami-Osawa, Hachioji-shi, Tokyo 192-0397, Japan
| | - G Lapertot
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
| | - Y Machida
- Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan
| | - K Izawa
- Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan
| | - J-P Brison
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
| | - J Flouquet
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
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Usuda K, Sagawa M, Motono N, Ueno M, Tanaka M, Machida Y, Maeda S, Matoba M, Tonami H, Ueda Y. Advantages of Diffusion Weighted Imaging of Pulmonary Nodules and Masses: Comparison with Positron Emission Tomography. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv046.02] [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: 11/13/2022] Open
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Uchida J, Iwai T, Kabei K, Machida Y, Kuwabara N, Naganuma T, Kumada N, Nakatani T. Effects of Conversion From a Twice-Daily Tacrolimus to a Once-Daily Tacrolimus on Glucose Metabolism in Stable Kidney Transplant Recipients. Transplant Proc 2014; 46:532-6. [DOI: 10.1016/j.transproceed.2013.11.146] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Revised: 11/07/2013] [Accepted: 11/27/2013] [Indexed: 12/21/2022]
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Uchida J, Iwai T, Machida Y, Kuwabara N, Kabei K, Kumada N, Nakatani T. Insulin resistance and insulin secretion in renal transplant recipients with hepatitis C. Transplant Proc 2013; 45:1540-3. [PMID: 23726615 DOI: 10.1016/j.transproceed.2013.01.053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 01/03/2013] [Indexed: 01/07/2023]
Abstract
BACKGROUND Several reports have suggested an association between hepatitis C virus (HCV) infection and new-onset diabetes after transplantation (NODAT). NODAT is a common complication after renal transplantation, and it has been associated with increased long-term morbidity and mortality. HCV-positive recipients may have abnormal glucose metabolism, even though NODAT has never been previously diagnosed. The aim of this study was to analyze the pathogenic factors responsible for glucose metabolism in a series of HCV-positive renal transplant recipients. METHODS The study population comprised 16 renal transplant patients who received their grafts from deceased or living donors with anti-HCV antibodies. HCV-negative transplant recipients were individually matched with these HCV-positive recipients by year of transplantation, sex, age, serum creatinine levels, and type of calcineurin inhibitors. None of the patients had been diagnosed with diabetes. Insulin secretion and insulin resistance were determined by a 75-g oral glucose tolerance test (OGTT) and compared between the 2 groups. Categories of glucose tolerance were defined according to World Health Organization criteria. RESULTS Glucose intolerance (impaired fasting glucose, impaired glucose tolerance, diabetes mellitus) as assessed by OGTT was detected in 7 of the HCV-positive recipients (43.8%) and 3 of the HCV-negative recipients. The homeostasis model assessment of insulin resistance was greater in the HCV-positive recipients than in the HCV-negative recipients. The homeostasis model assessment of β-cell function was higher in the HCV-positive recipients than in the HCV-negative recipients. CONCLUSIONS The frequency of glucose intolerance tended to be higher in HCV-positive recipients. Furthermore, insulin resistance was greater and insulin secretion higher in HCV-positive recipients, which indicated that the increase in insulin secretion compensated for insulin resistance observed in these patients. However, HCV-positive renal transplant recipients may ultimately develop NODAT as this compensation diminishes with time.
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Affiliation(s)
- J Uchida
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan.
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Machida Y, Tomokuni K, Izawa K, Lapertot G, Knebel G, Brison JP, Flouquet J. Verification of the Wiedemann-Franz law in YbRh2Si2 at a quantum critical point. Phys Rev Lett 2013; 110:236402. [PMID: 25167518 DOI: 10.1103/physrevlett.110.236402] [Citation(s) in RCA: 3] [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: 10/01/2012] [Revised: 02/04/2013] [Indexed: 06/03/2023]
Abstract
The thermal conductivity measurements are performed on the heavy-fermion compound YbRh(2)Si(2) down to 0.04 K and under magnetic fields through a quantum critical point (QCP) at B(c)=0.66 T∥c axis. In the limit as T→0, we find that the Wiedemann-Franz law is satisfied within experimental error at the QCP despite the destruction of the standard signature of Fermi liquid. Our results place strong constraints on models that attempt to describe the nature of the unconventional quantum criticality of YbRh(2)Si(2).
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Affiliation(s)
- Y Machida
- Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan
| | - K Tomokuni
- Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan
| | - K Izawa
- Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan
| | - G Lapertot
- SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, F-38054, France
| | - G Knebel
- SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, F-38054, France
| | - J-P Brison
- SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, F-38054, France
| | - J Flouquet
- SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, F-38054, France
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Machida Y, Kubota K, Katayama T, Toriihara A, Shibuya H. Diagnostic performance of fluorodeoxyglucose-positron emission tomography/computed tomography combined with ultrasonography-guided fine needle aspiration cytology for identifying axillary lymph node status in patients with breast cancer. Eur J Surg Oncol 2013; 39:26-30. [DOI: 10.1016/j.ejso.2012.10.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2012] [Revised: 08/30/2012] [Accepted: 10/12/2012] [Indexed: 02/05/2023] Open
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Machida Y, Uchida J, Kuwabara N, Kabei K, Koyama Y, Tachibana H, Naganuma T, Iwai T, Kumada N, Nakatani T. Once Daily Prolonged-Release Tacrolimus in de Novo Renal Transplantation: A Single-Center Experience. Transplantation 2012. [DOI: 10.1097/00007890-201211271-01976] [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: 11/25/2022]
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Uchida J, Machida Y, Iwai T, Kuwabara N, Kabei K, Kumada N, Nakatani T. Glucose Intolerance Is Associated with Increased Intimal Medial Thickness of the Carotid Artery and Increased Pulse Wave Velocity in Renal Transplant Recipients. Transplantation 2012. [DOI: 10.1097/00007890-201211271-01618] [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: 11/25/2022]
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Uchida J, Machida Y, Iwai T, Kuwabara N, Kabei K, Kumada N, Nakatani T. Glucose Intolerance Is Associated with Increased Intimal Medial Thickness of the Carotid Artery and Increased Pulse Wave Velocity in Renal Transplant Recipients. Transplantation 2012. [DOI: 10.1097/00007890-201211271-00583] [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: 11/25/2022]
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Machida Y, Tomokuni K, Ogura C, Izawa K, Kuga K, Nakatsuji S, Lapertot G, Knebel G, Brison JP, Flouquet J. Thermoelectric response near a quantum critical point of β-YbAlB4 and YbRh2Si2: a comparative study. Phys Rev Lett 2012; 109:156405. [PMID: 23102346 DOI: 10.1103/physrevlett.109.156405] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 07/25/2012] [Indexed: 06/01/2023]
Abstract
The thermoelectric coefficients have been measured down to a very low temperature for the Yb-based heavy-fermion compounds β-YbAlB4 and YbRh2Si2, often considered as model systems for the local quantum criticality case. We observe a striking difference in the behavior of the Seebeck coefficient S in the vicinity of their respective quantum critical point (QCP). Approaching the critical field, S/T is enhanced in β-YbAlB4, but drastically reduced in YbRh2Si2. The ratio of thermopower to specific heat remains constant for β-YbAlB4, but it is significantly reduced near the QCP in YbRh2Si2. In both systems, on the other hand, the Nernst coefficient shows a diverging behavior near the QCP. The interplay between valence and magnetic quantum criticality and the additional possibility of a Lifshitz transition crossing the critical field under magnetic field are discussed as the origin of the different behaviors of these compounds.
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Affiliation(s)
- Y Machida
- Department of Physics, Tokyo Institute of Technology, Meguro, Japan
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Machida Y, Itoh A, So Y, Izawa K, Haga Y, Yamamoto E, Kimura N, Onuki Y, Tsutsumi Y, Machida K. Twofold spontaneous symmetry breaking in the heavy-fermion superconductor UPt3. Phys Rev Lett 2012; 108:157002. [PMID: 22587277 DOI: 10.1103/physrevlett.108.157002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Indexed: 05/31/2023]
Abstract
The field-orientation dependent thermal conductivity of the heavy-fermion superconductor UPt3 was measured down to very low temperatures and under magnetic fields throughout the distinct superconducting phases: B and C phases. In the C phase, a striking twofold oscillation of the thermal conductivity within the basal plane is resolved reflecting the superconducting gap structure with a line of node along the a axis. Moreover, we find an abrupt vanishing of the oscillation across a transition to the B phase, as a clear indication of a change of gap symmetries. We also identify extra two line nodes below and above the equator in both B and C phases. From these results together with the symmetry consideration, the gap function of UPt3 is determined as a E(1u) representation characterized by a combination of two line nodes at the tropics and point nodes at the poles.
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Affiliation(s)
- Y Machida
- Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan
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Sakai N, Zhu L, Kurokawa A, Takeuchi H, Yano S, Yanoh T, Wada N, Taira S, Hosokai Y, Usui A, Machida Y, Saito H, Ichiyanagi Y. Synthesis of Gd2O3nanoparticles for MRI contrast agents. ACTA ACUST UNITED AC 2012. [DOI: 10.1088/1742-6596/352/1/012008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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21
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Tokumura T, Nagaoka M, Machida Y. Effect of doses and dosage forms on the bioavailability of amoxicillin in non-fasted rats. J Drug Deliv Sci Technol 2012. [DOI: 10.1016/s1773-2247(12)50098-5] [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: 11/26/2022]
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22
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Uchida J, Kuwabara N, Machida Y, Iwai T, Naganuma T, Kumada N, Nakatani T. Conversion of Stable Kidney Transplant Recipients From a Twice-Daily Prograf to a Once-Daily Tacrolimus Formulation: A Short-Term Study on its Effects on Glucose Metabolism. Transplant Proc 2012; 44:128-33. [DOI: 10.1016/j.transproceed.2011.11.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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23
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Balicas L, Nakatsuji S, Machida Y, Onoda S. Anisotropic hysteretic Hall effect and magnetic control of chiral domains in the chiral spin states of Pr2Ir2O7. Phys Rev Lett 2011; 106:217204. [PMID: 21699337 DOI: 10.1103/physrevlett.106.217204] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Indexed: 05/31/2023]
Abstract
We uncover a strong anisotropy in both the anomalous Hall effect (AHE) and the magnetoresistance of the chiral spin states of Pr(2)Ir(2)O(7). The AHE appearing below 1.5 K at a zero magnetic field shows hysteresis which is most pronounced for fields cycled along the [111] direction. This hysteresis is compatible with the field-induced growth of domains composed by the 3-in 1-out spin states which remain coexisting with the 2-in 2-out spin ice manifold once the field is removed. Only for fields applied along the [111] direction, we observe a large positive magnetoresistance and Shubnikov-de Haas oscillations above a metamagnetic critical field. These observations suggest the reconstruction of the electronic structure of the conduction electrons by the field-induced spin texture.
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Affiliation(s)
- L Balicas
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
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24
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Machida Y, Sakai S, Izawa K, Okuyama H, Watanabe T. Enhanced quasiparticle heat conduction in the multigap superconductor Lu2Fe3Si5 . Phys Rev Lett 2011; 106:107002. [PMID: 21469825 DOI: 10.1103/physrevlett.106.107002] [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] [Subscribe] [Scholar Register] [Received: 09/13/2010] [Indexed: 05/30/2023]
Abstract
Thermal transport measurements have been made on the Fe-based superconductor Lu2Fe3Si5 (T(c) ∼ 6 K) down to a very low temperature T(c)/120. The field and temperature dependences of the thermal conductivity confirm the multigap superconductivity with fully opened gaps on the whole Fermi surfaces. In comparison to MgB2, Lu2Fe3Si5 reveals a remarkably enhanced quasiparticle heat conduction in the mixed state. The results can be interpreted as a consequence of the unequal weight of the Fe 3d-electron character among the distinct bands.
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Affiliation(s)
- Y Machida
- Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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25
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Uchida J, Machida Y, Iwai T, Naganuma T, Kitamoto K, Iguchi T, Maeda S, Kamada Y, Kuwabara N, Kim T, Nakatani T. Desensitization Protocol in Highly HLA-Sensitized and ABO-Incompatible High Titer Kidney Transplantation. Transplant Proc 2010; 42:3998-4002. [DOI: 10.1016/j.transproceed.2010.09.043] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2010] [Accepted: 09/09/2010] [Indexed: 10/18/2022]
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26
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Ogita Y, Takahashi Y, Iwata M, Sasatsu M, Onishi H, Hashimoto S, Machida Y. Comparison of physical properties and drug-releasing characteristics of white petrolatums. Pharmazie 2010; 65:801-804. [PMID: 21155385] [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: 05/30/2023]
Abstract
White petrolatums of Japanese Pharmacopoeia grade and Sun white marketed as a cosmetic were characterized by measuring their physical properties and drug-releasing characteristics. White petrolatums of Japanese Pharmacopoeia grade available commercially in Japan were Perfecta, White 1S, Ultima, Snow, Snow V and Regent (Propeto). Penetrating stress, shear stress and spreading properties were measured as physical properties of the white petrolatums. The physical properties of white petrolatums varied, and Regent was the softest and the most spreadable ointment base. In vitro release test was performed using flow-through Franz diffusion cells. Fluorescein isothiocyanate and tetracycline hydrochloride were used as drug models. Their release characteristics varied among the tested white petrolatums, and Regent had the best release properties. Among the white petrolatums, with the exception of Regent, the release properties should depend on the distribution of drugs between white petrolatum and the receiver solution. Considerations of usability and characteristics of theprincipal agent are needed when choosing white petrolatums.
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Affiliation(s)
- Y Ogita
- Department of Pharmacy, Yokohama City University Medical Center, Yokohama, Japan
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27
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Uchida J, Machida Y, Iwai T, Naganuma T, Kitamoto K, Iguchi T, Maeda S, Kamada Y, Kumada N, Kuwabara N, Kim T, Nakatani T. DESENSITIZATION PROTOCOL IN HIGHLY HLA-SENSITIZED AND ABO-INCOMPATIBLE HIGH TITER KIDNEY TRANSPLANTATION. Transplantation 2010. [DOI: 10.1097/00007890-201007272-01249] [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: 11/25/2022]
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28
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Usami S, Okamoto S, Takebe I, Machida Y. Factor inducing Agrobacterium tumefaciens vir gene expression is present in monocotyledonous plants. Proc Natl Acad Sci U S A 2010; 85:3748-52. [PMID: 16593930 PMCID: PMC280295 DOI: 10.1073/pnas.85.11.3748] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Agrobacterium tumefaciens harboring the tumor-inducing Ti plasmid incites crown gall tumor on dicotyledonous species. Upon infection of these plants, Ti plasmid DNA sequence is stably transferred (T-DNA) by unknown mechanisms to plant cells to be integrated into nuclear DNA. The T-DNA processing and transfer require the expression of vir (virulence) genes on the Ti plasmid, which are known to be induced by certain phenolic compounds released from cells at the wounded inoculation site. The results of the present study demonstrate that wheat and oats contain a substance(s) that induces vir gene expression, yet the inducing substance of wheat differs from the phenolic inducers in that it is hydrophilic and has a molecular weight of several thousand. The novel inducer was not detectable in the exudates of seedlings of these plants but was found in an extract from the transition region between shoot and root of the seedlings and also in extracts from the seeds, bran, and germ. This finding suggests that T-DNA processing and possibly its transfer should take place when Agrobacterium invades suitable tissues of monocotyledonous plants.
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Affiliation(s)
- S Usami
- Department of Biology, Faculty of Science, Nagoya University Chikusa-ku, Nagoya 464, Japan
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29
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Tanaka M, Ueno M, Machida Y, Aikawa H, Usuda K, Sagawa M, Sakuma T. [Descending necrotizing mediastinitis]. Kyobu Geka 2009; 62:1073-1077. [PMID: 19894574] [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: 05/28/2023]
Abstract
We treated of 3 patients with descending necrotizing mediastinitis that is often to be fatal. There are 3 important issues regarding the treatment of this disease. First, the precise sites of abscess should be determined by computed tomography (CT) scans from the neck to diaphragm. Second, effective drainage of the neck and mediastinal abscess should be carried out immediately when the sites of abscess are determined. Third, drainage under video-assisted thoracic surgery (VATS) is an appropriate treatment because VATS is less invasive and provides an easier placement of the drainage tubes at abscess sites.
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Affiliation(s)
- M Tanaka
- Department of Thoracic Surgery, Kanazawa Medical University, Ishikawa, Japan
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30
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Usuda K, Sagawa M, Aikawa H, Ueno M, Tanaka M, Machida Y, Tsuchihara K, Masaki Y, Kinoshita E, Sakuma T. [Complete resection of an advanced mediastinal nonseminomatous germ cell tumor with multiple distant metastases after down-staging by chemotherapy]. Kyobu Geka 2009; 62:545-551. [PMID: 19588824] [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: 05/28/2023]
Abstract
A mediastinal nonseminomatous germ cell tumor was completely resected after down-staging by chemotherapy despite the presence of multiple distant metastases. A 22-year-old female was admitted for superior vena cava (SVC) syndrome. Her SVC was obstructed by a large anterior mediastinal tumor; she also exhibited distant metastases on a left rib, in the liver, and multiple in the lung. The blood alpha-fetoprotein (AFP) level was extremely elevated to 57,530 ng/ml. Four courses of BEP therapy [cisplatin (CDDP), bleomycin (BLM), etoposide (VP-16)] and a high dose chemotherapy followed by a peripheral blood stem cell transplantation made the tumor become smaller and effected its down-staging. Residual mediastinal tumor with an intravascular tumor in SVC was completely resected. The SVC was reconstructed by an artificial vessel graft. A mediastinal nonseminomatous germ cell tumor, even though it has multiple distant metastases, can achieve down-staging and complete resection by a chemotherapy based on scientific evidence.
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Affiliation(s)
- K Usuda
- Department of Thoracic Surgery, Kanazawa Medical University, Ishikawa, Japan
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31
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Kuga K, Karaki Y, Matsumoto Y, Machida Y, Nakatsuji S. Superconducting properties of the non-Fermi-liquid system beta-YbAlB4. Phys Rev Lett 2008; 101:137004. [PMID: 18851485 DOI: 10.1103/physrevlett.101.137004] [Citation(s) in RCA: 5] [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: 06/16/2008] [Indexed: 05/26/2023]
Abstract
beta-YbAlB4 is the first Yb-based heavy fermion superconductor with Tc = 80 mK. Our study using high-purity single crystals reveals that strongly type-II heavy fermion superconductivity emerges from the non-Fermi-liquid state with enhanced ferromagnetic fluctuations. High sensitivity of Tc to sample purity indicates strong pair-breaking effects due to impurities, probably of nonmagnetic type, suggesting an unconventional character of the superconductivity.
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Affiliation(s)
- K Kuga
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa 277-8581, Japan
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32
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Uchida J, Iwai T, Kato M, Machida Y, Naganuma T, Kumada N, Yoshimura R, Kawashima H, Kim T, Nakatani T. A Novel Approach to Successful ABO-Incompatible High-Titer Renal Transplantation. Transplant Proc 2008; 40:2285-8. [DOI: 10.1016/j.transproceed.2008.06.018] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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Kobayashi N, Ohno T, Yoshida K, Fukushima H, Mamada Y, Nomura M, Hirata H, Machida Y, Shinoda M, Suzuki N, Matsuoka H. Cardioprotective mechanism of telmisartan via PPAR-gamma-eNOS pathway in dahl salt-sensitive hypertensive rats. Am J Hypertens 2008; 21:576-81. [PMID: 18437150 DOI: 10.1038/ajh.2008.27] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND Recently, some investigators have shown that telmisartan, an angiotensin II (Ang II)-receptor blocker (ARB), is a partial agonist of the peroxisome proliferator-activated receptor-gamma (PPAR-gamma). We investigate whether telmisartan improves cardiovascular remodeling associated with the production of endothelial nitric oxide synthase (eNOS) through PPAR-gamma, inhibits the Rho-kinase pathway, and suppresses oxidative stress in Dahl salt-sensitive (DS) hypertensive rats. METHODS Telmisartan (1 mg/kg per day) or telmisartan plus PPAR-gamma inhibitor, GW9662 (1 mg/kg per day) was administered from the age of 6-11 weeks. Age-matched male Dahl salt-resistant (DR) rats served as a control group. RESULTS The levels of eNOS and PPAR-gamma expression, and eNOS phosphorylation were significantly lower in DS rats than in DR rats. Chronic telmisartan treatment in DS rats significantly increased these parameters, but not telmisartan plus GW9662. Telmisartan effectively inhibited the vascular lesion formation such as medial thickness and perivascular fibrosis, but not telmisartan plus GW9662. Moreover, upregulated RhoA protein, Rho-kinase mRNA, and myosin light-chain phosphorylation in DS rats was decreased by telmisartan to a similar degree as observed after treatment with Y-27632, a selective Rho-kinase inhibitor. In addition, NAD(P)H oxidase p22phox, p47phox, gp91phox expression, and mitogen-activated protein kinase and its downstream effector p70 S6 kinase phosphorylation in DS rats was also inhibited by telmisartan. CONCLUSIONS These results suggest that the cardioprotective mechanism of telmisartan may be partly due to improvement of endothelial function associated with PPAR-gamma-eNOS, oxidative stress, and Rho-kinase pathway.
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34
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Sagawa M, Usuda K, Tsuchihara K, Aikawa H, Machida Y, Tanaka M, Ueno M, Nakagawa K, Sakuma T. [Comparison of the images in virtual bronchoscopy under different conditions]. Kyobu Geka 2008; 61:102-108. [PMID: 18268944] [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: 05/25/2023]
Abstract
OBJECTIVE We report herein the comparison of the virtual bronchoscopy (VB) images which were constructed with 2 different computed tomography (CT) scanners combined with 3 different applications in 2 healthy adult volunteers. METHODS CT scanners were multi-detector row CT (MDCT) [64 detectors] and MDCT (16 detectors). Applications, by which VB images were made, were Leonardo (Leo), Ziostation (Zio), and Plus XNVZ2 (Plus). The image quality was evaluated by 3 expert bronchoscopists. RESULTS The change of the threshold value was necessary in Leo for practical use in subsegmental bronchi and more distal area, but unnecessary in Plus or Zio. When Plus was used, the VB images from the data obtained with MDCT (16 detectors) and MDCT (64 detectors) had almost equal quality. CONCLUSIONS Although the process to construct VB images was different in each application, it was regarded that Plus was not inferior to Zio or Leo in VB image quality.
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Affiliation(s)
- Motoyasu Sagawa
- Department of Thoracic Surgery, Kanazawa Medical University, Ishikawa, Japan
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35
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Aikawa H, Sagawa M, Usuda K, Ueno M, Tanaka M, Machida Y, Sakuma T. [Multidisciplinary treatment of lung cancer in 21st century]. Kyobu Geka 2008; 61:51-54. [PMID: 18186274] [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: 05/25/2023]
Abstract
Lung cancer is the leading cause of cancer deaths in Japan. Recently, big progress in the treatment of lung cancer has been achieved, such as new anti-cancer drugs, molecular targeted therapy, stereotactic radiotherapy, etc. Multidisciplinary approach has been required to the therapy for lung cancer patients. In this paper, we introduce The 21st Century Multidisciplinary Center in Kanazawa Medical University, and the Hokuriku Training Program for Making Specialists in Cancer Treatment.
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Affiliation(s)
- Hirokazu Aikawa
- Department of Thoracic Surgery, Kanazawa Medical University, Kanazawa, Japan
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36
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Takahashi Y, Takeda C, Seto I, Kawano G, Machida Y. Formulation and evaluation of lactoferrin bioadhesive tablets. Int J Pharm 2007; 343:220-7. [PMID: 17600641 DOI: 10.1016/j.ijpharm.2007.05.032] [Citation(s) in RCA: 20] [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] [Received: 04/25/2006] [Revised: 04/09/2007] [Accepted: 05/17/2007] [Indexed: 11/19/2022]
Abstract
For the treatment of chronic inflammation in the oral cavity, we attempted to develop bioadhesive tablets of bovine lactoferrin (B-LF) which has antibacterial properties and immune regulatory functions. B-LF tablets containing pectin, tamarind gum or carboxymethylcellulose (CMC) were prepared by direct compression. Tablets consisting of B-LF, pectin and xylitol passed through 60- or 100-mesh sieves were also prepared. The tablets containing CMC had insufficient bioadhesive force. Although the tablets containing tamarind gum showed the longest residence time in the oral cavity, an unpleasant taste gradually developed. The tablets containing pectin showed the highest value of bioadhesive force and the taste was acceptable. The characteristics of the B-LF tablets were improved by adding an appropriate amount of xylitol and using the ingredients sieved by a 100-mesh sieve. The therapeutic effect was evaluated by using rats with an ulcer on the oral mucosa. In the present study, swelling on the periphery of the ulcer was observed after administration of the B-LF tablets, and then the ulcer has reduced overall.
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Affiliation(s)
- Y Takahashi
- Department of Drug Delivery Research, Hoshi University, 2-4-41 Ebara, Tokyo 142-8501, Japan.
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37
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Machida Y, Nakatsuji S, Maeno Y, Tayama T, Sakakibara T, Onoda S. Unconventional anomalous Hall effect enhanced by a noncoplanar spin texture in the frustrated Kondo lattice Pr2Ir2O7. Phys Rev Lett 2007; 98:057203. [PMID: 17358893 DOI: 10.1103/physrevlett.98.057203] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2006] [Indexed: 05/14/2023]
Abstract
We have investigated the Hall effect in the geometrically frustrated Kondo lattice Pr2Ir2O7. In its spin-liquid-like paramagnetic regime, the Hall resistivity rho(xy) is found to increase logarithmically on cooling. Moreover, in this low temperature region, the field dependence of the Hall conductivity sigma(xy) shows a large enhancement up to 30 Omega(-1) cm(-1) as well as a nonmonotonic change with the magnetization. Our results are far different from the anomalous Hall effect due to the spin-orbit coupling observed in ordinary magnetic conductors. We discuss the possible spin-chirality effect in the Ir 5d conduction band due to the noncoplanar texture of Pr<111> Ising-like moments.
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Affiliation(s)
- Y Machida
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
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Hattori N, Machida Y, Sato S, Noda K, Iijima-Kitami M, Kubo S, Mizuno Y. Molecular mechanisms of nigral neurodegeneration in Park2 and regulation of parkin protein by other proteins. J Neural Transm Suppl 2006:205-8. [PMID: 17017530 DOI: 10.1007/978-3-211-45295-0_31] [Citation(s) in RCA: 5] [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] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Most of the patients with Parkinson's disease (PD) are sporadic. However, Since identification of monogenic forms of PD, the contribution of genetic factors to the pathogenesis of sporadic PD is proposed as one of major risk factors. Indeed, this is supported by the demonstration of the high concordance in twins, increased risk among relatives of PD patients in case control and family studies. Thus, the functional analysis for the gene products for familial PD provides us a good hint to elucidate the pathogenesis of nigral degeneration. For example, although alpha-synuclein is involved in a rare dominant form of familial PD with dopa responsive parkinsonian features, this molecule is a major component of and Lewy bodies (LBs). In contrast, Park2 (parkin-related disease) is the most frequent form among patients with young-onset PD. However, Park2 brains generally lack the formation of LBs. In the other word, parkin responsible for Park2 is essential for the formation of LBs. Thus, both alpha-synuclein and parkin are speculated to share a common pathway. Here, we reviewed the parkin function and molecular mechanisms of Park2.
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Affiliation(s)
- N Hattori
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, Japan.
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Nakatsuji S, Machida Y, Maeno Y, Tayama T, Sakakibara T, Duijn JV, Balicas L, Millican JN, Macaluso RT, Chan JY. Metallic spin-liquid behavior of the geometrically frustrated Kondo lattice. Phys Rev Lett 2006; 96:087204. [PMID: 16606220 DOI: 10.1103/physrevlett.96.087204] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2005] [Indexed: 05/08/2023]
Abstract
Strongly frustrated magnetism of the metallic pyrochlore oxide Pr2Ir2O7 has been revealed by single crystal study. While Pr 4f moments have an antiferromagnetic RKKY interaction energy scale of /T*/ = 20 K mediated by Ir 5d-conduction electrons, no magnetic long-range order is found except for partial spin freezing at 120 mK. Instead, the Kondo effect, including a lnT dependence in the resistivity, emerges and leads to a partial screening of the moments below /T*/. Our results indicate that the underscreened moments show spin-liquid behavior below a renormalized correlation scale of 1.7 K.
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Affiliation(s)
- S Nakatsuji
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
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40
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Sakurai H, Takahashi Y, Machida Y. Influence of low-frequency massage device on transdermal absorption of ionic materials. Int J Pharm 2005; 305:112-21. [PMID: 16239087 DOI: 10.1016/j.ijpharm.2005.09.008] [Citation(s) in RCA: 5] [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] [Received: 05/15/2005] [Revised: 08/25/2005] [Accepted: 09/05/2005] [Indexed: 11/23/2022]
Abstract
The influence of a low-frequency massage device on transdermal absorption of sodium benzoate, ketoprofen and diclofenac sodium was investigated in rats. Electrode pads spread with a hydroxypropyl cellulose gel containing the drug model were placed on excised skin in vitro. The transdermal permeation studies were carried out in the treatment group with the pulse applied through electrode pads spread with the gel, the pretreatment group with the gel applied after the application of the pulse and in the control group in which the gel was applied without the pulse. In vivo, transdermal absorption of ketoprofen was examined in the same groups used for the in vitro study. The pharmacokinetics of ketoprofen in plasma after intravenous injection was also studied. The treatment group showed higher cumulative permeated amounts of the drug models than the control in vitro. However, the enhancing effect was not observed in the pretreatment group. In vivo, the plasma ketoprofen level increased temporarily after the pulse was applied and then increased gradually as compared with the control. Since the distribution of ketoprofen from the central to the peripheral compartment was enhanced by the pulse in the injection study, enhancement of the biodistribution of ketoprofen by the low-frequency pulse was suggested.
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Affiliation(s)
- H Sakurai
- Department of Drug Delivery Research, Hoshi University, 2-4-41, Ebara, Shinagawa-ku, Tokyo 142-8501, Japan.
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41
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Kagawa M, Machida Y, Nishi H, Haginaka J. Direct Enantiomeric Purity Determination of Acetyl-L-carnitine by LC with a Ligand-Exchange Chiral Stationary Phase. Chromatographia 2005. [DOI: 10.1365/s10337-005-0610-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Mizutani K, Machida Y, Sugiyama K, Unzai S, Park SY, Tame JRH. The crystal structures of the pseudouridine synthases RluC and RluD. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305092573] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Souma S, Machida Y, Sato T, Takahashi T, Matsui H, Wang SC, Ding H, Kaminski A, Campuzano JC, Sasaki S, Kadowaki K. The origin of multiple superconducting gaps in MgB2. Nature 2003; 423:65-7. [PMID: 12721624 DOI: 10.1038/nature01619] [Citation(s) in RCA: 204] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2003] [Accepted: 04/08/2003] [Indexed: 11/09/2022]
Abstract
Magnesium diboride, MgB2, has the highest transition temperature (T(c) = 39 K) of the known metallic superconductors. Whether the anomalously high T(c) can be described within the conventional BCS (Bardeen-Cooper-Schrieffer) framework has been debated. The key to understanding superconductivity lies with the 'superconducting energy gap' associated with the formation of the superconducting pairs. Recently, the existence of two kinds of superconducting gaps in MgB2 has been suggested by several experiments; this is in contrast to both conventional and high-T(c) superconductors. A clear demonstration of two gaps has not yet been made because the previous experiments lacked the ability to resolve the momentum of the superconducting electrons. Here we report direct experimental evidence for the two-band superconductivity in MgB2, by separately observing the superconducting gaps of the sigma and pi bands (as well as a surface band). The gaps have distinctly different sizes, which unambiguously establishes MgB2 as a two-gap superconductor.
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Affiliation(s)
- S Souma
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
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Ide M, Yamate J, Machida Y, Nakanishi M, Kuwamura M, Kotani T, Sawamoto O. Emergence of different macrophage populations in hepatic fibrosis following thioacetamide-induced acute hepatocyte injury in rats. J Comp Pathol 2003; 128:41-51. [PMID: 12531686 DOI: 10.1053/jcpa.2002.0603] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [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: 01/21/2023]
Abstract
Macrophages may play a role in fibrogenesis. The kinetics and distribution of different macrophage populations were investigated immunohistochemically in hepatic lesions following acute hepatocyte injury induced in F344 rats by a single injection of thioacetamide (TAA) (300 mg/kg body weight, intraperitoneally). Hepatocyte degeneration or necrosis induced by TAA occurred mainly in the perivenular areas of hepatic lobules as early as post-injection (PI) days 1 and 3; fibrotic lesion development began in the damaged areas on day 1, and peaked on day 5; thereafter (PI days 7 and 10), the fibrotic areas decreased and were replaced by regenerated hepatocytes on PI days 15 and 20, indicating a remodelling process. In this rat model, the number of macrophages reacting with ED1 antibody (specific for exudate macrophages), ED2 (recognizing cell membrane antigens of resident macrophages, including Kupffer cells) and OX6 (recognizing MHC class II antigens expressed in antigen-presenting macrophages and dendritic cells) began to increase on PI day 1, peaking on PI day 3. The numbers gradually decreased on PI days 5 and 7; however, the statistically significant increase was maintained in respect of ED1-positive cells up to PI day 20, whereas no significant increase in ED2- and OX6-positive cells remained from PI day 10 onwards. Interestingly, of the ED1-, ED2- and OX6-positive cells, the OX6-positive cells were the least numerous. ED1- and OX6-positive cells appeared exclusively in the injured perivenular areas, whereas ED2-positive cells were present mainly in the mid-zonal areas and in smaller numbers in the perivenular areas. These findings indicated differences in kinetics and distribution between macrophage populations appearing in hepatic fibrosis. In addition, RT-PCR revealed that mRNA expression of osteopontin, a factor for induction and maintenance of macrophages in inflammation, was markedly increased on PI days 5, 7 and 10, suggesting a role in the pathogenesis of hepatic fibrosis.
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Affiliation(s)
- M Ide
- Department of Veterinary Pathology, Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University, Gakuencho 1-1, Sakai, Osaka 599-8531, Japan
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Affiliation(s)
- Y Okuma
- Department of Neurology, Juntendo University School of Medicine, Juntendo Izu-Nagaoka Hospital, 1129 Nagaoka, Izu-Nagaoka, Tagata-gun, Shizuoka 410-2295 Japan.
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46
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Tanaka H, Onouchi H, Kondo M, Hara-Nishimura I, Nishimura M, Machida C, Machida Y. A subtilisin-like serine protease is required for epidermal surface formation inArabidopsisembryos and juvenile plants. Development 2001; 128:4681-9. [PMID: 11731449 DOI: 10.1242/dev.128.23.4681] [Citation(s) in RCA: 145] [Impact Index Per Article: 6.3] [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: 01/10/2023]
Abstract
The surfaces of land plants are covered with a cuticle that is essential for retention of water. Epidermal surfaces of Arabidopsis thaliana embryos and juvenile plants that were homozygous for abnormal leaf shape1 (ale1) mutations were defective, resulting in excessive water loss and organ fusion in young plants. In ale1 embryos, the cuticle was rudimentary and remnants of the endosperm remained attached to developing embryos. Juvenile plants had a similar abnormal cuticle. The ALE1 gene was isolated using a transposon-tagged allele ale1-1. The predicted ALE1 amino acid sequence was homologous to those of subtilisin-like serine proteases. The ALE1 gene was found to be expressed within certain endosperm cells adjacent to the embryo and within the young embryo. Expression was not detected after germination. Our results suggest that the putative protease ALE1 affects the formation of cuticle on embryos and juvenile plants and that an appropriate cuticle is required for separation of the endosperm from the embryo and for prevention of organ fusion.
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Affiliation(s)
- H Tanaka
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
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Nakamura R, Egashira K, Arimura K, Machida Y, Ide T, Tsutsui H, Shimokawa H, Takeshita A. Increased inactivation of nitric oxide is involved in impaired coronary flow reserve in heart failure. Am J Physiol Heart Circ Physiol 2001; 281:H2619-25. [PMID: 11709431 DOI: 10.1152/ajpheart.2001.281.6.h2619] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Recent evidence suggests that increased inactivation of endothelium-derived nitric oxide (NO) by oxygen free radical (OFR) formation is involved in the pathogenesis of endothelial dysfunction in heart failure (HF). However, it is unclear whether increased OFR limits coronary flow reserve in HF. To test this hypothesis, we examined the effects of antioxidant therapy on coronary flow reserve in a canine model of tachycardia-induced HF. The flow reserve (percent increase in coronary blood flow) to adenosine or to 20-s ischemia was less and OFR formation (electron-spin resonance spectroscopy) in myocardial tissues was greater in HF dogs than in controls. Immunohistochemical staining of 4-hydroxy-2-nonenal, an OFR-induced lipid peroxide, was detected in coronary microvessels of HF dogs. Intracoronary infusion of a cell-permeable OFR scavenger, tiron, suppressed OFR formation and improved the vasodilating capacity to adenosine or brief ischemia in HF dogs but not in controls. A NO synthesis inhibitor, N(G)-monomethyl-L-arginine (L-NMMA), diminished the beneficial effects of tiron in HF dogs. Vasodilation to sodium nitroprusside was similar between control and HF dogs, and no change in its response was noted with tiron or tiron + L-NMMA in either group. In summary, antioxidant treatment with tiron improved coronary flow reserve by increasing NO bioactivity in HF dogs. Thus increased OFR formation may impair coronary flow reserve in HF by reducing NO bioactivity.
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Affiliation(s)
- R Nakamura
- Department of Cardiovascular Medicine, Kyushu University Graduate School of Medicine, Fukuoka, Japan
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Abstract
Plant cytokinesis involves the formation of a cell plate. This is accomplished with the help of the phragmoplast, a plant-specific cytokinetic apparatus that consists of microtubules and microfilaments. During centrifugal growth of the cell plate, the phragmoplast expands to keep its microtubules at the leading edge of the cell plate. Recent studies have revealed potential regulators of phragmoplast microtubule dynamics and the involvement of a mitogen-activated protein kinase cascade in the control of phragmoplast expansion. These studies provide new insights into the molecular mechanisms of plant cytokinesis.
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Affiliation(s)
- R Nishihama
- Department of Biology, University of North Carolina, Chapel Hill, North Carolina 27599-3280, USA
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Abstract
In order to clarify the suitability of assay method, the stability of amoxycillin (AMX) in the acidic solution at pH 1.2 was determined by two different methods, ultraviolet absorption (UV) and HPLC methods. The determination was simultaneously performed for the same sample solutions. The data from HPLC method indicated that AMX degraded and the concentration of AMX in the acidic solution was decreased. The apparent first-order rate constant (k(obs)) for the degradation was 9.83x10(-2) h(-1), and the half-life was calculated to be 7.04 h. On the other hand, the data obtained from UV method apparently represented that the concentration of AMX increased with time-course. This phenomena was brought about by the increase of UV absorption at 272 nm, which accompanied with the degradation of AMX. These results clearly indicate that UV method can not be used for determining the samples accompanying the degradation of AMX. In general, the dissolution test (drug release test) has been used for the evaluation of a sustained-release dosage form of AMX. It is impossible to avoid the degradation of AMX in the test under acidic conditions. The results indicated that the UV method should not be used for the determination of AMX in the test.
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Affiliation(s)
- T Tokumura
- Department of Drug Delivery Research, Hoshi University, Ebara 2-4-41, Shinagawa, 142-8501, Tokyo, Japan.
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Hamamoto K, Koike R, Machida Y. The effect of soybean oil refuse powder used as vehicle on the absorption of oxolinic acid in chickens under fasting and nonfasting conditions and the correlation with in vitro dissolution. J Vet Pharmacol Ther 2001; 24:333-41. [PMID: 11696083 DOI: 10.1046/j.1365-2885.2001.00347.x] [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: 11/20/2022]
Abstract
The effect of soybean oil refuse powder (SOR) when used as a vehicle on the absorption of oxolinic acid (OXA) powder in chicken, the dissolution profile of OXA and the correlation between in vivo and in vitro study were examined. To examine in vivo bioavailability, chickens fed or fasted were studied using a 2 x 2 crossover design. The OXA was administered OXA or OXA-SOR (1 : 9) mixture 20 mg OXA/kg. In vitro dissolution rates for OXA and OXA-SOR were measured using the paddle (PD) and the rotatory dialysis cell dissolution (PTSW) methods. Maximum plasma concentration (Cmax) and area under the curve (AUC) were significantly increased by the addition of SOR to OXA. Differences between OXA and OXA-SOR were more remarkable under fasted as compared with fed condition. In vitro dissolution rates of OXA-SOR pH 1.2, 6.5 and 7.2 as determined by the PD and the PTSW methods were increased in the presence of SOR vehicle. Differences between OXA and OXA-SOR in vitro dissolution rates were greater than in vivo bioavailability. Correlation between in vitro release (%) and in vivo absorption (%) showed good linearity (gamma=0.8805-0.9999).
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Affiliation(s)
- K Hamamoto
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, Tokura 1-15-1, Kokubunji-shi 185-8511, Tokyo, Japan
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