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Biomedical subjects

K Urushiyama

Publications and source records attributed to K Urushiyama.

6 recordsLinked to original sources
PubMed1998

Vibration acceleration magnitudes of hand-held tools and workpieces.

The magnitudes of the hand-transmitted vibration, 297 hand-held tools and workpieces were measured at workplaces. The tools were used mainly in construction and manufacturing industries. The current standard for the measurement of hand-transmitted vibration has been based on the frequency-weighted acceleration of dominant axis method. According to the proposal of ISO/CD5349-1, the results of measurements (462 points) were recalculated by the method of the frequency-weighted acceleration sum. There is 32% of difference in average value between the acceleration sum and the dominant axis method.

Acceleration↗
PubMed1994

Longitudinal study of workers exposed to mercury vapour at low concentrations: time course of inorganic and organic mercury concentrations in urine, blood, and hair.

Seven Japanese female workers exposed to mercury vapour at a concentration of < 0.02 mg Hg/m3 (8 h/day, 44 h/week) were examined for inorganic (I-Hg) and organic (O-Hg) mercury concentrations in urine, blood, and hair after 0, 4, 8, 17, and 23 months of exposure. Both I-Hg and O-Hg concentrations in urine and hair did not increase significantly even after 23 months of exposure. The concentration of I-Hg and O-Hg in plasma and O-Hg in erythrocytes, however, increased significantly after four months of exposure, and the high concentrations were maintained until the end of the study (23 months of exposure). Absence of a significant increase in the concentration of O-Hg in hair indicates that changes in concentrations of I-Hg and O-Hg in blood could be caused by the occupational exposure to mercury vapour. These results show clearly that mercury concentration in blood indicates the uptake of mercury compared with data from before employment with mercury. Even after 23 months of exposure to mercury vapour, however, urinary mercury concentration was not affected.

Adult↗
PubMed1988

Plasma levels of leukotriene C4, B4, slow reacting substance of anaphylaxis in chronological phases of cerebrovascular disease.

In this study we report and compare plasma leukotriene (LT) levels in seventeen (17) patients with cerebral infarction, five (5) patients with cerebral hemorrhage and twelve (12) age-matched healthy volunteers. Plasma samples were collected at intervals of 1-7 days, 8-14 days, 15-30 days and 31 days- after cerebrovascular accident. Plasma immunoreactive LTC4, LTB4 and SRS-A (Slow Reacting Substance of Anaphylaxis or total peptido-LT's) levels were measured for each sample. Immunoreactive LTC4 (and SRS-A) levels were elevated in patients with cerebral infarction whilst LTB4 levels were raised in the patients with cerebral hemorrhage. In particular, cerebral infarcted patients exhibited significantly elevated levels in phases 1-7 days and after 15 days when compared with the age-matched healthy volunteers. In patients with cerebral hemorrhage, significant increases in LTB4 were measured in days 1-7 only. These results suggest a clinical relationship between the plasma levels of LT's and cerebrovascular disease.

Adult↗
PubMed1976

Mercury in cigarettes.

Mercury in cigarettes of domestic and foreign products was measured by Magon's method, and the sample of a domestic brand was burned by a smoking machine and the smoke was collected for the measurement of mercury. In tobacco leaf and paper, only inorganic mercury was found in both domestic and foreign products. Its amount in tobacco leaf and paper of a piece of cigarette was about 60 ng in domestic products and about 30 ng in foreign products. By burning, the unit length of a cigarette released about 5-7 ng of mercury into smoke.

Filtration↗