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Biomedical subjects

I Anzai

Publications and source records attributed to I Anzai.

18 recordsLinked to original sources
PubMed2001

Concentration of 137Cs in dried Lentinula edodes (Shiitake) as an indicator of environmental contamination.

We analysed the concentration of radioactive cesium in dried Lentinula edodes (Shiitake) produced in Japan, and evaluated its use as an indicator of radioactive contamination. We collected Lentinula edodes (Shiitake) mushrooms grown on wood in 38 prefectures from north to south, and measured 137Cs, 134Cs and 40K concentrations with high purity Ge-detectors. The concentration ranges were as follows: 137Cs <0.003-61.1 Bq/kg, 40K 378.7-667.3 Bq/kg; 134Cs was undetectable. There was a positive correlation between 137Cs concentrations in Shiitake and those in rain and dry fallout (P < 0.05). They were also correlated inversely with atmospheric temperature (P < 0.01). The multiple correlation coefficient comparing 137Cs concentration with atmospheric temperatures, 40K concentrations and fallout levels was 0.56 which was statistically significant (P < 0.01). A variance analysis based on the 137Cs concentration classified by geographical area (Hokkaido-Tohoku, Kanto, Chubu, Kinki, Chugoku, Shikoku and Kyushu) showed that the variance between the groups was significantly greater than that within each group which, together with the above-mentioned information, suggests that the 137Cs levels are affected primarily by these environmental factors.

Analysis of Variance↗
PubMed1999

Measurement of airborne radon concentrations at several sites in a radioactivity research laboratory.

Radon-222 is a natural, gaseous, radioactive nuclide released from the ground and building materials into the air. Radon and its daughter nuclides can be an important disturbance factor for the measurement of environmental radioactivity. Radon concentrations in air in a radiation laboratory were measured with PICO-RAD detectors, which directly adsorb radon gas on activated charcoal. Generally, radon concentration increased in the absence of ventilation; a high concentration was observed in a radioisotope storage room without ventilation. Concentrations were low in other rooms used for experiments and measurement, which suggests that the radiation control practice in this laboratory is satisfactory and that the influence of natural radon gas on the measurement of radioactivity is negligible.

Air Pollutants, Radioactive↗
PubMedDate not supplied

A comparative study of body composition of urban and rural Japanese boys 12 to 14 years old.

Whole body counting of potassium-40 and anthropometric measurements were done on 88 urban and rural Japanese boys 12 to 14 years of age. The log-normal distribution provided a good fit to the observed data of potassium content in both groups. The urban and rural boys did not differ significantly in age, weight, body and sitting height, chest and abdomen circumferences, antero-posterior diameter of chest and abdomen, and grip strength. On the other hand, the mean potassium content, K/body weight, K/fat-free mass and estimated upper-arm muscle circumference were significantly greater in rural boys. Skinfold thickness and percentage fat were significantly greater in urban boys. In a regression analysis estimating whole body potassium from anthropometric variables, body weight and skinfold thickness were the most significant variables, accounting for 85.2% of the total variation. Estimation errors were smaller in the rural than in the urban group. Factor analysis was used to identify the factors which could explain the items measuring body composition and strength. Factor 1, in which potassium content and grip strength are the most important items, was designated as the 'Muscular Factor', and Factor 2, in which skinfold thickness and upper-arm circumference are the most significant items, was designated as the 'Fatness Factor'. The factor scores of rural subjects were scattered in a considerably narrower range than those of urban subjects.

Abdomen↗