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Effect of gravitational acceleration on temperature wave propagation in a critical fluid (1998)

Ishii, Koji ; Maekawa, Toru

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 72 (1998), S. 16-18

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Temperature propagation near the critical point of a classical fluid is investigated theoretically. The governing equations of thermal energy transfer near the critical point are introduced and a linear analysis is carried out. The dispersion relation between the angular frequency and the wave number is obtained and the wave characteristics are discussed. The effect of gravitational acceleration on the temperature wave propagation is made clear. Through this analysis, the following results were obtained; (1) The propagation speed of temperature waves is γ/(ρ0κT),where γ, ρ0, and κT are, respectively, the ratio of specific heats, the density, and the isothermal compressibility, with or without gravity if the wavelength is larger than 10−3.(2) The amplitude of wave increases with time in the antigravitational direction and decreases in the gravitational direction but the decay time is long if the wave number is small. (3) Waves decay quickly if the wave number is larger than 104. © 1998 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.120632

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Malignant transformation of Nakamura type IV gastric polyp with CA 19-9 production (1998)

Nagai, Kazuki ; Ishii, Koji ; Matsumaru, Katsuhiko ; [et al.]

Springer

Journal of gastroenterology 33 (1998), S. 91-96

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ISSN: 1435-5922

Keywords: Key words: Nakamura type IV gastric polyp ; proliferating cell nuclear antigen (PCNA) labeling index ; DNA ploidy pattern analysis

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract: In a 68-year-old Japanese man, a gastric polyp 24 mm in diameter with a stalk 15 mm in diameter was diagnosed as well differentiated adenocarcinoma and treated by endoscopic polypectomy. Histologically, most of the resected tissue was adenoma, and atypical cells were papillarily proliferating to form adenocarcinoma in adenoma, a Nakamura type IV gastric polyp. Infiltration of carcinoma was limited to within the mucosal layer. Immunohistochemical study with anti-CA19-9 antibody revealed positive staining in carcinoma cells. Serum CA19-9 level, which showed slight elevation, returned to the normal range 1 month after the polypectomy. The proliferating cell nuclear antigen (PCNA) labeling index and DNA ploidy pattern were analyzed in the resected tissue. The PCNA labeling index was 30% in carcinoma, 17% in adenoma, and 0.1% in the normal tissue. The DNA ploidy pat-tern was diploid in adenoma and aneuploid in adenocarcinoma. These findings suggest that gastric adenoma, as well as colonic adenoma, may have the potential for malignant transformation.