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Biomedical subjects

A Shitara

Publications and source records attributed to A Shitara.

15 recordsLinked to original sources
PubMed2000

[Three-dimensional analysis of eye movements induced by roll and pitch tilt].

The torsional eye movements induced by the right and left ear-down position are known as "ocular counter-rolling" but the mechanism of the horizontal and vertical eye movements has not been clarified. The vertical eye movements induced by backward tilt are known as the "doll reflex", but clear eye movements are induced by forward tilt. The mechanism of horizontal and torsional eye movements are unclear. To detect 3D eye movements in the roll and pitch planes, we performed 3D analysis of eye movements by our video-oculographic method. During roll tilt, counter-torsional eye movements were clearly induced, but no definite, eye movements were observed in the horizontal and vertical components of eye movements. During pitch tilt, downward eye movements were observed following backward tilt, but no clear eye movements were observed following forward tilt. Moreover, no clear horizontal or torsional eye movements were observed during pitch tilt. These results suggest that the response to pitch tilt depends on the saccular input.

Adult↗
PubMed2000

Three dimensional eye movement analysis during off vertical axis rotation in human subjects.

Three dimensional analysis of eye movements during OVAR was performed in 37 healthy human subjects using the computerized image recognition technique developed by us. The modulation component of eye movement was observed in all three components (horizontal, vertical and torsional), whereas the bias component was only clearly seen in the horizontal eye movement. The phase lag of the torsional component was quite consistent with a small variation between each subject with respect to the head position. The phase of vertical eye movement was, however, less consistent compared to that of the horizontal and torsional eye movements. From these results, in human subjects, there should be some differences in the dynamic function of the otolith system compared to that observed in monkeys.

Adult↗
PubMed1999

Three-dimensional analysis of pressure nystagmus in labyrinthine fistulae.

In this study we analysed pressure nystagmus three-dimensionally in subjects with labyrinthine fistulae. The fistulae were localized in the lateral canal in five patients, in the posterior canal in one patient and in both lateral and anterior canals in two patients. The eye velocities during the fistula test in patients with lateral canal fistula and in a patient with posterior canal fistula were closely aligned with the anatomical axes. On the other hand, pressure nystagmus in cases with fistulae of both the lateral and anterior canals were not aligned with the anatomical axes of the combination of both canals.

Ear Canal↗
PubMed1993

Effects of fasting on distribution and excretion of lead following long-term lead exposure in rats.

Lead was given to rats through drinking water containing 100 ppm lead acetate for 20 days. Delta-aminolevulinic acid dehydratase (ALAD) activity in erythrocytes was significantly lower (p < 0.05) at 20 days after Pb treatment. Erythrocytic ALAD activity was significantly lower (p < 0.05) in fasted rats than in fed rats with or without Pb pretreatment. Serum glutamic pyruvic transaminase and glutamic oxaloacetic transaminase activities after 6 days of fasting were significantly higher (p < 0.05) in Pb pretreated rats than in other groups (Pb nontreated fed and fasted rats, and Pb pretreated fed rats). Long periods of fasting strongly enhanced these serum-enzymes elevations induced by lead. Maximum Pb concentrations and total amount in feces increased in rats fasted for 3 days regardless of Pb pretreatment. On the other hand, total amount of Pb in feces of rats fasted for 6 days were not significantly different from the other groups because their fecal volume decreased to about 1% of fed rats. The Pb concentrations of liver, kidney, spleen, and femur increased significantly in Pb pretreated rats compared to in controls, but there were no significant differences between the fed and fasted rats.

Alanine Transaminase↗
PubMed1991

4'-galactooligosaccharide affects sodium and potassium metabolism in rats.

The effect of different levels (0, 10 and 20%) of O-beta-D-galactopyranosyl-(1-4)-O-beta-D-galactopyranosyl-(1-4)-D- glucose (4'-GL) on the bioavailability of sodium and potassium was studied in 18 male rats. Three 3-d metabolic balance studies were conducted during the 62-d feeding trial. These were between d 30 and 32 (first period), 45 and 47 (second period) and 60 and 62 (third period). Growth and food intake were not significantly different (P less than 0.05) between the control group and the 4'-GL-fed groups. In rats fed 10 and 20% 4'-GL diet, the fecal sodium excretion was significantly greater (P less than 0.05) in all three balance periods. Fecal potassium excretion was significantly greater (P less than 0.05) in the 10% 4'-GL-fed group in the second balance period and the 20% 4'-GL-fed group in all balance periods relative to the control group. Although not statistically significant, rats in the 4'-GL-fed groups exhibited a tendency for lower sodium retention and higher potassium retention compared with the control group. The cecal weight of rats in both 4'-GL-fed groups was significantly heavier (P less than 0.05) than that of the control group at the end of study. Sodium concentration in the cecum was significantly lower (P less than 0.05) in the 20% 4'-GL-fed group relative to the other groups.

Animals↗
PubMed1987

Merkel cell tumor.

A Merkel cell tumor appeared on the left cheek of an 83-year-old female was reported. The tumor was located mainly in the dermis and infiltrated to the subcutaneous adipose tissue with an involvement of the blood vessels and lymphatics at the periphery. Electron-microscopically, few of the dense-cored granules and the single globular aggregates of intermediate filaments at the nuclear indentations were observed. Electron-microscopic uranaffin reaction proved positive reaction on the dense-cored granules. Half of the cytoplasmic border was smooth, while the rest had short projections. Desmosomes or junctional complexes were not detected among the tumor cells. Immunohistochemically, the cytoplasm of tumor cell showed positive reaction to both neuron-specific enolase (NSE) and keratin. The single globular positive spots of the latter were localized in accordance with the aggregates of intermediate filaments. These findings suggested a neurogenic origin with double differentiation, epithelial and neuroendocrine, of the Merkel cell tumor.

Adenocarcinoma↗
PubMed1986

A T cell leukemia line produces factor(s) that render rat neutrophils cytotoxic.

Proteose-peptone-induced intraperitoneal neutrophils from rats were activated in terms of tumor cytotoxicity by pretreatment with culture supernatants from a human T cell leukemia line, Jurkat (culture sup). Culture sup-treated neutrophils showed cytotoxicity against various tumor cell lines. The cytotoxicity of culture sup-treated neutrophils was dependent on the number of neutrophils and the concentration of culture sup. Cytostasis by activated neutrophils was observed very early in the assay incubation period (within 6 hr), but cytolysis first occurred at 24 hr after the start of incubation. Factor(s) in culture sup responsible for the activation of cytotoxic neutrophils were stable to temperature and pH treatments, and their molecular weight was higher than 10,000. The responsible factor(s) for activation of cytotoxic neutrophils were different from interleukin-2, serum-derived factor, and bacterial lipopolysaccharide.

Animals↗
PubMed1977

Nevus cells observed in the sebaceous glands.

Of sebaceous gland-containing specimens of melanocytic nevi, a total of 79 specimens from 70 cases of nevocellular nevus (consisting of 10 cases of compound nevus and 60 of intradermal nevus), four cases of juvenile melanoma and three of blue nevus were examined light-microscopically in detail for the presence or absence of nevus cells or dermal melanocytes in the sebaceous glands. As a result, clusters of cells that appeared to be nevus cells were found in the sebaceous glands of specimens from a total of three cases, that is, two cases of nevocellular nevus i.e. compound nevus, and one of the cases of juvenile melanoma. Two cases were infantile and one case was the age of puberty. The origin of the nevus cells found in the sebaceous glands is discussed.

Adolescent↗