Regulation of bile acid synthesis in man is incompletely understood, in part because of difficulty in making measurements over short time periods when the enterohepatic circulation is intact. We investigated the possibility of a diurnal rhythm of bile acid synthesis in three human subjects given [26-14C]cholesterol. When this isotope of cholesterol, which is randomly labeled in the 26 and 27 po...

BACKGROUNDS Tension-type headache is a common psychosomatic disease. However, diurnal variation of headache is yet to be clarified, perhaps due to the lack of an appropriate method to investigate it. Like other painful diseases, it would be helpful to know if there is diurnal variation in tension-type headaches, both for managing headaches and understanding their pathophysiology. The aim of thi...

biological organization, ranging from molecules to humans, including clinical investigations. It is published 12 times a year investigations that illuminate normal or abnormal regulation and integration of physiological mechanisms at all levels of publishes original A neural theory of circadian rhythms: AschofFs rule in diurnal and nocturnal mammals CARPENTER, GAIL A., AND STEPHEN GROSSBERG. A ...

Recent progress in satellite remote-sensing techniques for precipitation estimation, along with more accurate tropical rainfall measurements from the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) and precipitation radar (PR) instruments, have made it possible to monitor tropical rainfall diurnal patterns and their intensities from satellite information. One year (August 1998...

This paper uses dissipation values derived from UARS/HRDI observations in a recently published diurnal-tide model. These model structures compare quite well with the UARS/HRDI observations with respect to the annual variation of the diurnal tidal amplitudes and the size of the amplitudes themselves. It is suggested that the annual variation of atmospheric dissipation in the mesosphere-lower the...

this study assesses the air quality of two urban localities, fahaheel and al-rabia city, to assistlocal authorities to generate information supporting the planning of pollution control strategies to keeppollutants within safe limits in the long run. in terms of diurnal and seasonal variations, almost all measured pollutants exhibited two peaks: one in the morning and another in the afternoon. t...

The diurnal variation in cholesterol synthesis exhibited by rat liver has been examined in fed, fasted, and adrenalectomized animals. Fasting for 3 days caused a lowering of the rate of synthesis but did not abolish the diurnal rhythm. Adrenalectomy abolished the diurnal variation, and caused synthesis to remain at a uniformly high level. We suggest that corticosterone may play an essential rol...

The present study examined the relationship between ageing, physical function and the diurnal rhythms of cortisol and dehydroepiandrosterone (DHEA). Participants were 36 community dwelling older adults aged between 65 and 86 years old. Salivary cortisol and DHEA were measured over the course of one day: immediately upon awakening, 30 min later, and then 3 h, 6 h, 9 h and 12 h post-awakening. Pa...

Disputable questions of modern somnology, the neuroscience branch involving wakefulness-sleep cycle regulation, circadian and diurnal rhythms and other related problems, are regarded. Among them are the questions of the extent of similarity of the alternation of active-rest periods in the nematode, fruit fly, zebrafish and other simple model organisms to the waking-sleeping rhythm in warm-blood...