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Matsuyama, Junko,Sato, Takuichi,Takahashi, Nobuhiro Korean Academy of Oral Biology and the UCLA Dental 2000 International Journal of Oral Biology Vol.25 No.3
Restriction fragment length polymorphism (RFLP) analysis of polymerase chain reaction〔PCR〕-amplified 16S ribosomal RNA genes〔16S rRNA genes PCR-RFLP〕using MnlI has been shown to be a useful tool in defferentiating oral Actinomyces species. In this study, the method was applied to Actinomyces isolates from human dental plaque〔n=77〕, and the findings were compared with those obtained by biochemical identification methods. As a result, 46 strains out of 55 A. naeslundii genospecies 1 strains were mis-identified as A. israelii〔n=35〕 and A. meyeri〔n=11〕; and 2 strains out of 12 A. naeslundii genospecies 2 strains were mis-identified as A. israelii by biochemical identification methods. Therefore, one should pay attention to the mis-identification of a. naeslundii species by conventional biochemical tests.
ON CURVATURE PINCHING FOR TOTALLY REAL SUBMANIFOLDS OF $H^n$(c)
Matsuyama, Yoshio Korean Mathematical Society 1997 대한수학회지 Vol.34 No.2
Let S be the Ricci curvature of an n-dimensional compact minimal totally real submanifold M of a quaternion projective space $HP^n (c)$ of quaternion sectional curvature c. We proved that if $S \leq \frac{16}{3(n -2)}c$, then either $S \equiv \frac{4}{n - 1}c$ (i.e. M is totally geodesic or $S \equiv \frac{16}{3(n - 2)}c$. All compact minimal totally real submanifolds of $HP^n (c)$ satisfy in $S \equiv \frac{16}{3(n - 2)}c$ are determined.
Effects of Deep Seawater on the Growth of a Green Alga, Ulva sp.(Ulvophyceae, Chlorophyta)
Matsuyama, Kazuyo,Serisawa, Yukihiko,Nakashima, Toshimitsu The Korean Society of Phycology 2003 ALGAE Vol.18 No.2
In order to examine the effects of deep seawater (mesopelagic water in the broad sense) on the growth of macroalgae, the growth and nutrient uptake (nitrate and phosphate) of Ulva sp. (Ulvophyceae, Chlorophyta) were investigated by cultivation in deep seawater (taken from 687 m depth at Yaizu, central Japan, in August 2001), surface seawater (taken from 24 m depth), and a combination of the two. Culture experiments were carried out in a continuous water supply system and an intermittent water supply system, in which aerated 500-mL flasks with 4 discs of Ulva sp. (cut sections of ca. 2 $cm_2$) were cultured at 20$^{\circ}C$ water temperature, 100 $\mu$mol photons $m^{-2}{\cdot}s^{-1}$ light intensity, and a 14:10 light:dark cycle. Nutrient uptake by Ulva sp. was high in all seawater media in both culture systems. The frond area, dry weight, chlorophyll a content, dry weight per unit area, and chlorophyll a content per unit area of Ulva sp. at the end of the experimental period were the highest in deep seawater and the lowest in surface seawater in both culture systems. These values, except for dry weight per unit area and chlorophyll a content per unit area, for each seawater media in the intermittent water supply system were higher than those in the continuous water supply system. We conclude that not only deep seawater as the culture medium but also the seawater supply system is important for effective cultivation of macroalgae.
ON SUBMANIFOLDS OF A SPHERE WITH BOUNDED SECOND FUNDAMENTAL FORM
Matsuyama, Yoshio Korean Mathematical Society 1995 대한수학회보 Vol.32 No.1
Let $S^{n+p}$(c) be the (n + p)-dimensional Euclidean sphere of constant curva ture c and let M be an n-dimensional compact minimal submanifold isometric ally immersed in $S^{n+p}$(c). Let $A_\xi$ be the second fundamental form of M in the direction of a normal $\xi$ and T the tensor defined by $T(\xi, \eta) = traceA_\xi A_\eta$.
The Wholesomeness Evaluation of Irradiated Foods at National and International Levels
Matsuyama, Akira The Korean Society of Food Hygiene and Safety 1987 한국식품위생안전성학회지 Vol.2 No.3
The wholesomeness studies on irradiated foods and the evaluation of the data obtained have been conducted at both national and international levels. The conclusion of the FAO/IAEA/WHO Expert Committee on Wholesomeness of Irradiated Food in 1980 that irradiated foods treated with doses up to 10 kGy are safe for human consumption are being significantly influencing on the regulatory circumstances, in individual countries as well as a regional economic community. Principles of the wholesomeness evaluation, importance of radiation chemical considerations, methodology of toxicological testing and the interpretation of in vitro and in vivo toxicity studies are discussed. Emphasis is placed on the progress of methods for wholesomeness studies and data evaluations and also on the importance e of comparative assessments together with safety problems concerning other food treatments and environmental factors.