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Biomedical subjects

R Cook

Publications and source records attributed to R Cook.

At least 55 records · Page 3Linked to original sources
PubMed1975

The attractiveness to males of female Drosophila melanogaster: effects of mating, age and diet.

Decapitated females were used to examine the attractiveness to males (duration of courtship elicited) of female Drosophila melanogaster. Decapitated females show but few behavioural responses. The attractiveness of virgin females varied with age, being at a maximum on the day of eclosion, and declining thereafter. Even though decapitated inseminated females do not extrude their genitalia they received less courtship than decapitated virgin females. In protein-fed inseminated females attractiveness to males returned in parallel with sexual receptivity. A sucrose diet rendered both virgin and inseminated decapitated females more attractive to males, but did not prevent the change in attractiveness due to mating. The ejaculate and ovarian activation are suggested as causal factors in these processes.

Age Factors↗
PubMedDate not supplied

The dosimetric properties of an intraoperative radiation therapy applicator system for a Mevatron-80.

An applicator system for intraoperative radiation therapy has been fabricated which does not require physical docking with the accelerator. A dosimetric study has been completed which documents the properties of this system for a variety of electron beam energies, applicator sizes, collimator settings, both primary and secondary, and source-surface distance (SSD) settings. Sensitivity of the system to common misalignment errors was also determined. Results indicate (a) applicator leakage of less than 5%, (b) beam flatness to within plus or minus 5% at the dMAX with a single primary collimator setting, (c) smooth changes in output with cone size, beam energy and SSD, and (d) negligible changes in dose distributions within alignment errors permitted by the system.

Brachytherapy↗