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Biomedical subjects

T Omori

Publications and source records attributed to T Omori.

At least 91 records · Page 5Linked to original sources
PubMed1989

Model of neural visual system with self-organizing cells.

This paper describes a model of a neural visual system of a higher animal, in which the capability of pattern recognition develops adaptively. To produce the adaptability, we adopted "self-organizing cells," and with them modeled feature-detecting cells which were discovered by Hubel and Wiesel and whose plasticity was found by Blakemore and Cooper. Combining the "self-organizing cells" and the learning principle of a Perceptron-type system, we constructed a model of the whole visual system. The model is also equipped with an eye movement control mechanism for gazing, which reduces the number of "self-organizing cells" required for pattern recognition, thus contributing to their quick self-organization. Computer simulation and an experiment using a hardware simulator showed that "self-organizing cells" quickly become sensitive to the features often seen and that the resulted system can classify patterns with a rather small number of feature-detecting cells.

Computer Simulation↗
PubMed1987

Hemagglutination with transmissible gastroenteritis virus.

Transmissible gastroenteritis virus grown in primary swine kidney cell cultures agglutinated erythrocytes from chicken, guinea pig and cattle but not erythrocytes from mouse and goose. The optimal incubation temperature was at 4 degrees C. The hemagglutination (HA) reaction was inhibited by specific antiserum. Some factors involved in the HA and HA-inhibition (HI) were investigated and standard HA and HI tests were established. HI antibody titers of individual pig sera showed a significant positive correlation with their neutralizing antibody titers.

Animals↗
PubMed1987

Purification and properties of haloalkane dehalogenase from Corynebacterium sp. strain m15-3.

A haloalkane dehalogenase was purified to electrophoretic homogeneity from cell extracts of a 1-chlorobutane-utilizing strain, m15-3, which was identified as a Corynebacterium sp. The enzyme hydrolyzed C2 to C12 mono- and dihalogenated alkanes, some haloalcohols, and haloacids. The Km value of the enzyme for 1-chlorobutane was 0.18 mM. Its molecular weight was estimated to be 36,000 by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and 33,000 by gel filtration. The isoelectric point was pH 4.5. The optimum pH for enzyme activity was found to be 9.4, and the optimum temperature was 30 to 35 degrees C. The enzyme was stable for 1 h at temperatures ranging from 4 to 30 degrees C but was progressively less stable at 40 and 50 degrees C.

Amino Acids↗
PubMed1985

Rapid cooling contracture in frog striated muscles treated with chlorpromazine and haloperidol.

Rapid cooling contracture (RCC) was observed in frog toe muscles pretreated with caffeine, chlorpromazine (CPZ), or haloperidol (HPD). During rapid cooling contracture in the presence of caffeine (caffeine-RCC) tension developed to more than 0.8 of the maximum tetanic tension (P0). CPZ inhibited twitch but induced rapid cooling contracture (CPZ-RCC) between 50 and 150 microM; the tension saturated at the level of 0.75 P0 at 100 microM. HPD also inhibited twitch and induced rapid cooling contracture (HPD-RCC) at concentrations greater than 25 microM; the maximum tension was 0.25 P0. In the presence of dantrolene (10 microM), the tension during CPZ-RCC was reduced by 40%. Procaine (0.25%) reduced the CPZ-RCC tension by as much as 60%. These results suggest that CPZ and HPD induced rapid cooling contracture by reducing Ca2+-accumulation in sarcoplasmic reticulum.

Animals↗