摘要:

The time of oviposition and the locomotor activity rhythm of pairs of male and female medaka,Oryzias latipes, under LD 16:8 and continuous light were investigated. The fish layed eggs just before or after the onset of light periods in LD 16:8 and the time of oviposition gradually delayed every day when the fish were transferred from LD 16:8 to continuous light. Thus, the oviposition rhythm is clearly entrained by light‐dark cycles and it shows a circadian rhythm in continuous light.

ISSN:0022-1945    

DOI:10.1080/09291018209359769

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The circadian leaf movement inOxalis regnellihas been investigated under the influence of continuous white light of different intensity between 50 to 2000 lux. The results obtained from the recordings can be summed up to the following statements:1.At dim light the development in time of the amplitude of movement shows an irregular decline characterized by a distinct but temporary attenuation.2.At dim light the shape of movement in the beginning is prevailed by the pronounced spreading movement but then changes to predominance of the folding movement. This change appears during the transient minimum of the amplitude.3.The development in time of amplitude and shape is compressed by bright light. Thus at high light intensities the folding movement remains during a few free‐running periods.4.Appearance and position in time of the amplitude attenuation accompanied by the change of the shape are influenced by pretreatment.5.Transient amplitude attenuations are not caused by interference of the two circadian systems coinciding with their pulses of opposite direction, but they reflect the fading‐out of one system succeeded by the other that produces amplitudes with still increasing size.

ISSN:0022-1945    

DOI:10.1080/09291018209359770

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

In order to investigate whether changes in basal metabolic rate (BMR) influence the basic 24‐h rhythm of body temperature we examined daily variations of body temperature in eight hyperthyroid patients and two patients with anorexia nervosa. Although they exhibited high and low BMR, respectively, they demonstrated the temperature rhythm patterns similar to those in healthy control. These results suggest that both an increased and a decreased BMR may not modify the circadian rhythm of human body temperature.

ISSN:0022-1945    

DOI:10.1080/09291018209359771

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Photoperiods are recognized to induce a variety of physiological events in organisms, in particular, several daily or circadian rhythms. Hormones are secreted in daily rhythm patterns and provide regulation of other rhythmic physiological events. Serotonin is understood by several investigators to be a hormone that is produced in response to photoperiods, and its pattern of secretion is circadian in output, e.g. under long term tissue culture conditions (previous study). This study shows that monochromatic lights in photoperiods cause circadian outputs of serotonin. Yellow light (578 nm) produced the serotonin secretion pattern most nearly similar to white (control) light. The highest levels of serotonin were seen in the early evening which was maintained throughout the night. Each end of the visible spectrum produced the least overall amount of serotonin in time and the middle of the spectrum the greatest amount. Notable exceptions to this general trend were the effects of ultra violet and violet light, which produced overall amounts more similar to that seen in green and orange light. No monochromatic light produced the amount seen in the control light. This would lead to the conclusion that the tissue photoreceptors are probably not single molecules, but more probably exist as a system which utilizes a variety of light wavelengths to regulate circadian events.

ISSN:0022-1945    

DOI:10.1080/09291018209359772

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

In sexually mature male and female mice the percentage of neurocytes containing lipofuscin pigment (LFP) has been specified as well as the accumulation of this pigment in the para‐ventricular nucleus (PVN), the arcuate nucleus (AN), and the supraoptic nucleus (SON). It has been found that the number of neurocytes containing LFP as well as the accumulation of LFP in PVN, AN and SON show essential diurnal changes. The greatest number of neurocytes containing LFP and also the concentration of this pigment in PVN, AN and SON were observed at 18.00 h, both in males and in females, and the smallest number at 6.00 h.

ISSN:0022-1945    

DOI:10.1080/09291018209359773

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

A whole blood lymphocyte stimulation test (using phytohemagglutinin and concanavalin‐A), an in vitro corollary of in vivo cell mediated immunity, was done with blood collected twice monthly from five male subjects over a period of 20 months (February 1979‐September 1980). Simple correlations between pairs of subjects were positive and, in general, statistically significant. For some subjects the data fit a harmonic function with an estimated peak activity in the winter of 1979, similar to our previous findings with dogs. The seasonal fluctuations were analyzed for possible association with 22 environmental parameters. Selected parameters were highly specific for each subject; however, parameters directly or indirectly associated with quality and quantity of solar radiation (e.g. sunspot numbers and number of minutes between sunrise and sunset) were often chosen as predictors of lectin‐induced lymphocyte transformation. No trend was observed in the correlation between environmental factors and immunity. The human subjects studied exhibit similar seasonal variation in immunity as do dogs.

ISSN:0022-1945    

DOI:10.1080/09291018209359774

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

A distinct daily cyclicity in the body weight of Spotted munia, a diurnal waxbill (fam.Estrildidae), was established. The results indicated that the cycle persists even after: (a) the removal of food contents; (b) fixing the food intake to constant intervals. No parallelism was found in daily feeding pattern and daily weight gain. The cyclicity is therefore not due to food intakeper sebut may be a physiological phenomenon. The body weight continued to cycle in LL and the cycles of different animals were desynchronized indicating an endogenous circadian nature. The cycles were entrainable to LD 12:12 and ahemeral light/dark cycles LD 8:8, LD 6:6. Since the body weight in Spotted munia exhibits a distinct annual/circannual rhythmicity, this bird may be an ideal model for the study of interaction, if any, between the daily/circadian and annual/circannual rhythms.

ISSN:0022-1945    

DOI:10.1080/09291018209359775

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

ISSN:0022-1945    

DOI:10.1080/09291018209359768

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor