National University Corporation Tottori University , abbreviated to Toridai , is a national university in Japan. The main campus is located in Koyamachō-Minami, Tottori City, Tottori Prefecture. Another campus, the Faculty of Medicine, is located on the Yonago Campus in Yonago, Tottori. Wikipedia.
Kimura R.,Tottori University
Scientific Online Letters on the Atmosphere | Year: 2012
The relationship between the strong wind and land cover in dust source regions and the Asian dust event over Japan (ADE) was analyzed using the weather reports and coverage of the Normalized Differential Vegetation Index (NDVI) derived from the MODIS-Terra reflectance products during the spring (March to May) of 2000 to 2011. The target area for the dust source area in northeast Asia was defined as 35°N to 45°N and 100°E to 115°E as with Kimura (2012), with reference to past results (Iwasaka et al. 2009; Lim and Chun 2006; Shao and Dong 2006; Sun et al. 2001). The annual change in the number of ADE agreed well with the Dust Storm Frequency (DSF) in the target area (R2 = 0.549). Strong wind has significant effect on ADE (R2 = 0.538), and coverage of NDVI ranging from 0.05 to 0.2 (bare land or bare land with less vegetation) and that of NDVI over 0.2 (vegetation surface reducing dust outbreaks) in April and May are also related to the number of ADE. The coverage of bare land or bare land surface with less vegetation decreased by 4%; in contrast, vegetation surface reducing dust outbreaks increased 4% in the 12 years from 2000 to 2011. Increasing trend of vegetation corresponded to the decreasing trend in ADE (R2 = 0.359). © 2012, the Meteorological Society of Japan.
Ifuku S.,Tottori University
Molecules | Year: 2014
Chitin nanofibers are prepared from the exoskeletons of crabs and prawns, squid pens and mushrooms by a simple mechanical treatment after a series of purification steps. The nanofibers have fine nanofiber networks with a uniform width of approximately 10 nm. The method used for chitin-nanofiber isolation is also successfully applied to the cell walls of mushrooms. Commercial chitin and chitosan powders are also easily converted into nanofibers by mechanical treatment, since these powders consist of nanofiber aggregates. Grinders and high-pressure waterjet systems are effective for disintegrating chitin into nanofibers. Acidic conditions are the key factor to facilitate mechanical fibrillation. Surface modification is an effective way to change the surface property and to endow nanofiber surface with other properties. Several modifications to the chitin NF surface are achieved, including acetylation, deacetylation, phthaloylation, naphthaloylation, maleylation, chlorination, TEMPO-mediated oxidation, and graft polymerization. Those derivatives and their properties are characterized. © 2014 by the authors licensee MDPI Basel Switzerland.
Takeuchi T.,Tottori University
Development Growth and Differentiation | Year: 2014
The regulation of cardiomyocyte proliferation is important for heart development and regeneration. The proliferation patterns of cardiomyocytes are closely related to heart morphogenesis, size, and functions. The proliferation levels are high during early embryogenesis; however, mammalian cardiomyocytes exit the cell cycle irreversibly soon after birth. The cell cycle exit inhibits cardiac regeneration in mammals. On the other hand, cardiomyocytes of adult zebrafish and probably newts can proliferate after cardiac injury, and the hearts can be regenerated. Therefore, the ability to reproliferate determines regenerative ability. As in other cells, the relationship between proliferation and differentiation is very interesting, and is closely related to cardiac development, regeneration and homeostasis. In this review, these topics are discussed. © 2014 The Author.
Kotani T.,Tottori University
Journal of the Physical Society of Japan | Year: 2014
We have developed the quasiparticle self-consistent GW (QSGW) method based on a recently developed mixed basis all-electron full-potential method (PMT method), which uses the augmented plane waves (APWs) and the highly localized muffin-tin orbitals (MTOs) simultaneously. We call this PMT-QSGW. Because of the two types of augmented bases, we have an efficient description of one-particle eigenfunctions in materials with a small number of basis functions. In QSGW, we have to treat a static nonlocal exchange-correlation potential, which is generated from the selfenergy. We expand the potential in the highly localized MTOs. This allows us to carry out stable interpolation of the selfenergy in the whole Brillouin zone. In addition, we have improved the offset-Γ method for the Brillouin zone integration, so that we take into account the anisotropy of the screened Coulomb interaction in the calculation of the selfenergy. For GaAs and cubic SiO2, we checked the convergence of calculated band gaps on cutoff parameters. PMTQSGW is implemented in a first-principles electronic structure package ecalj, which is freely available from github. © 2014 The Physical Society of Japan.
Kuwamoto S.,Tottori University
Human Pathology | Year: 2011
Recent outstanding research has rapidly revealed new aspects of the biology, etiology, and clinicopathology of Merkel cell carcinoma, a rare but highly aggressive neuroendocrine skin malignancy that affects the elderly and immunosuppressed patients. Molecular biological studies, especially the discovery of Merkel cell polyomavirus, have shed new light on the pathogenesis of the disease. Increasing evidence strongly suggests that this virus is causally related to the development of Merkel cell carcinoma. On the other hand, many studies have also indicated that a subset (approximately 20%) of Merkel cell carcinomas are not likely to be associated with the virus. Tumors with and without the virus have been shown to be significantly different in prognosis, oncogene expression, and histologic appearance, suggesting that they have different etiologies. Moreover, studies on the histopathology, immunohistochemistry, and cytogenetics have revealed several biological factors that are related to the clinical behavior and prognosis of the disease. This review summarizes the advances in the molecular biology of Merkel cell carcinoma based on recent study results. Although the exact molecular pathway of the pathogenesis of Merkel cell carcinoma remains unclear, further understanding of the pathophysiology of this tumor is expected to result in novel therapeutic approaches for management of the disease and contribute to better patient outcomes. © 2011 Elsevier Inc. All rights reserved.