Visual behavior of juvenile Limulus in their natural habitat and in captivity.
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Animals↗
Biomedical subjects
D Borst
Publications and source records attributed to D Borst.
Stage-specific production and release of juvenile hormone esterase from the ovary of Diploptera punctata.
Juvenile hormone esterase (JHE) is a catabolic enzyme that specifically degrades juvenile hormone (JH) and has been identified in hemolymph and tissues in both larvae and adults of numerous insect species. This study investigates the presence of JHE in ovaries of the viviparous cockroach, Diploptera punctata, and the in vitro release of JHE from these ovaries during the first gonadotrophic cycle. JHE is released in vitro from maturing basal (most posterior) follicles and from follicle cells isolated from oocytes during the short period of time between spermatophore release and chorion formation. Enzyme release is dependent upon the presence of calcium in the medium. This released ovarian JHE appears to be larger than and to display ionic characteristics that are different from the isolated hemolymph and fat body JHEs. In addition, JHE activity measured in homogenates of whole ovaries and subsequently oviposited basal oocytes increases dramatically following spermatophore release, coincident with a previously described decline in JH titer in the ovary. A likely role for ovarian JHE is the site-specific degradation of JH in and around the oocyte prior to fertilization and embryonic development.
Journal Article↗
Human resource management.
The occupational health physician can take advantage of the broad functions of human resource management to offer care and treatment in a very practical way in the day-to-day workplace. Understanding the capabilities and services of the human resource department can aid the occupational health practitioner in maintaining employee health and productivity. Thus, the individual is helped as well as the organization. This article describes the functions of the human resource department and delineates the close connection between it and the occupational health physician.
Humans↗