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404 results on '"Omata Y"'

10. Epidemiology of hospitalised paediatric community-acquired pneumonia and bacterial pneumonia following the introduction of 13-valent pneumococcal conjugate vaccine in the national immunisation programme in Japan

Author

Takeuchi, N., primary, Naito, S., additional, Ohkusu, M., additional, Abe, K., additional, Shizuno, K., additional, Takahashi, Y., additional, Omata, Y., additional, Nakazawa, T., additional, Takeshita, K., additional, Hishiki, H., additional, Hoshino, T., additional, Sato, Y., additional, and Ishiwada, N., additional

Published
2020
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12. Growth of Au nanoparticle films and the effect of nanoparticle shape on plasmon peak wavelength.

Author

Horikoshi, S., Matsumoto, N., Omata, Y., and Kato, T.

Subjects
GOLD nanoparticles, THIN films, PLASMONS (Physics), SCANNING electron microscopy, FIELD emission
Abstract

Metal nanoparticles (NPs) exhibit localized surface plasmon resonance (LSPR) and thus have potential for use in a wide range of applications. A facile technique for the preparation of NP films using an electron-cyclotron-resonance plasma sputtering method without a dewetting process is described. Field emission scanning electron microscopy (FE-SEM) observations revealed that the Au NPs grew independently as island-like particles during the first stage of sputtering and then coalesced with one another as sputtering time increased to ultimately form a continuous film. A plasmon absorption peak was observed via optical measurement of absorption efficiency. The LSPR peak shifted toward longer wavelengths (red shift) with an increase in sputtering time. The cause of this plasmon peak shift was theoretically investigated using the finite-difference timedomain calculation method. A realistic statistical distribution of the particle shapes based on FESEM observations was applied for the analysis, which has not been previously reported. It was determined that the change in the shape of the NPs from spheroidal to oval or slender due to coalescence with neighbouring NPs caused the LSPR peak shift. These results may enable the design of LSPR devices by controlling the characteristics of the nanoparticles, such as their size, shape, number density, and coverage. [ABSTRACT FROM AUTHOR]

Published
2014
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18. Intra- and extracellular reactive oxygen species (ROS) generated by blue light

Author

Omata, Y., Lewis, J.B., Rotenberg, S., Lockwood, P.E., Messer, R.L.W., Noda, M., Hsu, S.D., Sano, H., and Wataha, J.C.

Subjects
dehydrogenase, tumor cells, photopolymerization, cancer, DFDA, cell-culture, succinate
Abstract

The title when publishing in the magazine [Intra- and extracellular reactive oxygen species generated by blue light], Blue light from dental photopolymerization devices has significant biological effects on cells. These effects may alter normal cell function of tissues exposed during placement of oral restorations, but recent data suggest that some light-induced effects may also be therapeutically useful, for example in the treatment of epithelial cancers. Reactive oxygen species (ROS) appear to mediate blue light effects in cells, but the sources of ROS (intra- versus extracellular) and their respective roles in the cellular response to blue light are not known. In the current study, we tested the hypothesis that intra- and extracellular sources of blue light-generated ROS synergize to depress mitochondrial function. Normal human epidermal keratinocytes (NHEK) and oral squamous cell carcinoma (OSC2) cells were exposed to blue light (380-500 nm; 5-60 J/cm2) from a dental photopolymerization source (quartz-tungsten-halogen, 550 mW/cm2). Light was applied in cell-culture media or balanced salt solutions with or without cells present. Intracellular ROS levels were estimated using the dihydrofluorescein diacetate (DFDA) assay; extracellular ROS levels were estimated using the leucocrystal violet assay. Cell response was estimated using the MTT mitochondrial activity assay. Blue light increased intracellular ROS equally in both NHEK and OSC2. Blue light also increased ROS levels in cell-free MEM or salt solutions, and riboflavin supplements increased ROS formation. Extracellularly applied ROS rapidly (50-400 M

Published
2006

20. AB1058 The New Joint Weighted Scoring System Which Predicts The Modified Health Assessment Questionnaires Scores in Rheumatoid Arthritis Patients: A Validation Study Using The National Database of Rheumatic Diseases by iR-net in Japan

Author

Ono, K., primary, Ohashi, S., additional, Oka, H., additional, Kadono, Y., additional, Omata, Y., additional, Matsumoto, T., additional, Izawa, N., additional, Nishino, J., additional, Tanaka, S., additional, and Tohma, S., additional

Published
2016
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33. Redescription of Neospora caninum and its differentiation from related coccidia

Author

Dubey, JP, Barr, BC, Barta, JR, Bjerkås, I, Björkman, C, Blagburn, BL, Bowman, DD, Buxton, D, Ellis, JT, Gottstein, B, Hemphill, A, Hill, DE, Howe, DK, Jenkins, MC, Kobayashi, Y, Koudela, B, Marsh, AE, Mattsson, JG, McAllister, MM, Modrý, D, Omata, Y, Sibley, LD, Speer, CA, Trees, AJ, Uggla, A, Upton, SJ, Williams, DJL, Lindsay, DS, Dubey, JP, Barr, BC, Barta, JR, Bjerkås, I, Björkman, C, Blagburn, BL, Bowman, DD, Buxton, D, Ellis, JT, Gottstein, B, Hemphill, A, Hill, DE, Howe, DK, Jenkins, MC, Kobayashi, Y, Koudela, B, Marsh, AE, Mattsson, JG, McAllister, MM, Modrý, D, Omata, Y, Sibley, LD, Speer, CA, Trees, AJ, Uggla, A, Upton, SJ, Williams, DJL, and Lindsay, DS

Abstract

Neospora caninum is a protozoan parasite of animals, which before 1984 was misidentified as Toxoplasma gondii. Infection by this parasite is a major cause of abortion in cattle and causes paralysis in dogs. Since the original description of N. caninum in 1988, considerable progress has been made in the understanding of its life cycle, biology, genetics and diagnosis. In this article, the authors redescribe the parasite, distinguish it from related coccidia, and provide accession numbers to its type specimens deposited in museums. Published by Elsevier Science Ltd. on behalf of Australian Society for Parasitology Inc.

Published
2002

44. Redescription of Neospora caninum and its differentiation from related coccidia

Author

Dubey, J.P, primary, Barr, B.C, additional, Barta, J.R, additional, Bjerkås, I, additional, Björkman, C, additional, Blagburn, B.L, additional, Bowman, D.D, additional, Buxton, D, additional, Ellis, J.T, additional, Gottstein, B, additional, Hemphill, A, additional, Hill, D.E, additional, Howe, D.K, additional, Jenkins, M.C, additional, Kobayashi, Y, additional, Koudela, B, additional, Marsh, A.E, additional, Mattsson, J.G, additional, McAllister, M.M, additional, Modrý, D, additional, Omata, Y, additional, Sibley, L.D, additional, Speer, C.A, additional, Trees, A.J, additional, Uggla, A, additional, Upton, S.J, additional, Williams, D.J.L, additional, and Lindsay, D.S, additional

Published
2002
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