Biomedical subjects

A Shapiro

Publications and source records attributed to A Shapiro.

At least 235 records · Page 13Linked to original sources

PubMed1977

Minimal requirements in defined media for improved growth of some radio-resistant pink tetracocci.

Defined media permitting extensive growth of representative pink radio-resistant tetracocci (Micrococcus radiodurans, Micrococcus roseus, and Micrococcus radiophilus) and two controls (an ultraviolet-sensitive mutant of M. radiodurans and Micrococcus luteus) are described. Availability of Fe (especially Fe3+) proved essential for good growth, as evidenced by (i) favorable effects of hydroxamic acids, e.g., salicylhydroxamic acid, and (ii) the growth promotion by hemin when joined with elevated concentrations of Fe. Cobalamin (B12) and methionine were interchangeable as an absolute requirement for methionine not affected by B12. M. luteus required neither. Pink radio-resistant micrococci may form a coherent group. Some divergences among them might be attributable to the method for isolating them, which for ordinary bacteria would be mutagenic to the point of total lethality. The ecology of these tetracocci vis-à-vis other pink-red radio-resistant organisms is discussed in relation to a question: can these bacteria be isolated without dependence on radiation as the cardinal selective factor?

Culture Media↗

PubMed1977

Self-disclosure as a function of self-concept and sex.

It was hypothesized that the amount of self-disclosure occurring in a dyadic interaction would be a function of the level of self-concept and the sex of the subjects, with high self-concept subjects and females disclosing more than low self-concept subjects and males. Two hundred and ten subject (105 females and 105 males) were measured for level of self-concept and then paired so that every possible combination of high, medium, and low self-concept subject paired with a partner of high, medium, or low self-concept, and a partner of the same or opposite sex, occurred. The amount of self-disclosure that occurred in the dyadic interaction was measured. It was found that self-concept was significantly related to the amount of self-disclosure. High self-concept subjects were more responsive to the level of self-concept of their partners than were other subjects. There was no relationship between the sex of the subject and the amount of self-disclosure.

Female↗

PubMed1977

Aerobic work capacity in high school students in Israel.

Maximal oxygen uptake (Vo2max) was predicted in 1,951 high school students aged 14 to 19 years--1,061 girls and 890 boys--from five different types of high school. The schools represented most of the ethnic groups. The mean Vo2max in the boys was 41.3 +/- 9.4 (SD), and in the girls, 34.7 +/- 10.1 ml - kg-1 - min-1; it was highest at the age of 16 in the boys, and at ages 14 and 15 in the girls. Significant ethnic differences in Vo2max were recorded; Vo2max was highest in students of Middle Eastern and North African origin [boys 42.7 +/- 9.3 (SD), girls 35.9 +/- 14.5], and lowest in the subjects of European and North American origin (boys 39.8 +/- 9.2, girls 33.2 +/- 9.3). Israel-born students showed average values (boys 40.7 +/- 9.6, girls 35.2 +/- 10.9). Significant differences in mean Vo2max values were observed in the general and agricultural high schools, and the lowest values in boys were oberved in the heshiva (parochial) high school, and in girls in the state religous high school. The differences in Vo2max in the various subpopulations in Israel can be attributed mainly to different patterns of physical activity and in part to ethnic origin.

Adolescent↗

PubMed1976

Transport calculations of gamma ray flux density and dose rate about implantable californium-252 sources.

Gamma flux density and dose rate distributions have been calculated about implantable californium-252 sources for an infinite tissue medium. Point source flux densities as a function of energy and position were obtained from a discrete-ordinates calculation, and the flux densities were multiplied by their corresponding kerma factors and added to obtain point source dose rates. The point dose rates were integrated over the line source to obtain line source dose rates. Container attenuation was accounted for by evaluating the point dose rate as a function of platinum thickness. Both primary and secondary flux densities and dose rates are presented. The agreement with an independent Monte Carlo calculation was excellent. The data presented should be useful for the design of new source configurations.

Californium↗

PubMed1976