Photoperiodic regulation of the hamster testis: dependence on circadian rhythms
Journal Article
·
· Proc. Natl. Acad. Sci. U.S.A.; (United States)
The testes of hamsters exposed to short days (10 hr of light per day) regress within 13 weeks. Administration of 7.5 percent deuterium oxide to hamsters lengthens the period of free running circadian activity rhythms by 2.2 percent and prevents testicular regression during short-day exposure. This is consistent with predictions derived from an external coincidence model for photoperiodic time measurement: Deuterium oxide changes phase relationships between the light-dark cycle and the circadian system, the hamster's daily photosensitive phase is stimulated with light during short days, and the testes remain large. Conservation of the period of circadian rhythms within narrow limits has adaptive significance for hamster photoperiodism and for the occurrence and phasing of the annual reproductive cycle.
- Research Organization:
- Univ. of California, Berkeley
- OSTI ID:
- 7085540
- Journal Information:
- Proc. Natl. Acad. Sci. U.S.A.; (United States), Journal Name: Proc. Natl. Acad. Sci. U.S.A.; (United States) Vol. 75:2; ISSN PNASA
- Country of Publication:
- United States
- Language:
- English
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·
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Related Subjects
551000 -- Physiological Systems
560172* -- Radiation Effects-- Nuclide Kinetics & Toxicology-- Animals-- (-1987)
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
ANNUAL VARIATIONS
BIOLOGICAL EFFECTS
BODY
DAILY VARIATIONS
DISEASES
GONADS
HAMSTERS
HEAVY WATER
HYDROGEN COMPOUNDS
MALE GENITALS
MAMMALS
ORGANS
OXYGEN COMPOUNDS
PATHOLOGICAL CHANGES
PHOTOPERIOD
REPRODUCTION
RODENTS
TESTES
VARIATIONS
VERTEBRATES
WATER
560172* -- Radiation Effects-- Nuclide Kinetics & Toxicology-- Animals-- (-1987)
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
ANNUAL VARIATIONS
BIOLOGICAL EFFECTS
BODY
DAILY VARIATIONS
DISEASES
GONADS
HAMSTERS
HEAVY WATER
HYDROGEN COMPOUNDS
MALE GENITALS
MAMMALS
ORGANS
OXYGEN COMPOUNDS
PATHOLOGICAL CHANGES
PHOTOPERIOD
REPRODUCTION
RODENTS
TESTES
VARIATIONS
VERTEBRATES
WATER