Physically, he had no sense of night, morning, or any diurnal rhythm.

The group of four in the basement developed their own diurnal rhythm as the days stretched into weeks.

Most of the time, unless emergency conditions prevailed, the Enterprise worked on a regular diurnal rhythm.

Human beings have a built-in diurnal rhythm; we try to adjust to it."

Diurnal rhythms are known to depend on visual pathways and to respond to light intensity.

He wasn't sure if he missed Athos's diurnal rhythm or its weather more.

Like many ecozones, the sector follows a diurnal rhythm.

Many reptiles have a preferred temperature range within internally regulated diurnal rhythms.

There was no remnant of a diurnal rhythm in the genes of these creatures.

Further, Enterprise's diurnal rhythms had been tied in with the Admiralty upon departure.

The secretion of aldosterone has a diurnal rhythm.

Thermoregulation in the rock hyrax has been subject to much research, as their body temperature varies with a diurnal rhythm.

The idea that time's passage has an objective dimension connected with diurnal rhythms is, of course, increasingly quaint, and may eventually become obsolete.

These cycles are often affected by changes in sleep cycle (too much or too little), diurnal rhythms, and environmental stressors.

Humans, left to themselves, adopt a longer diurnal rhythm than the 24-hour day, so they can be reset like a lot of little clocks at sunset.

The first category was labeled "Diurnal Rhythms."

Most aquatic insects hatch and lay their eggs between late morning and midafternoon in autumn, returning to the diurnal rhythms of early spring.

But however far they travel from their native world, human beings can never escape the diurnal rhythm, set ages ago by its cycle of light and darkness.

They undergo a diurnal rhythm of physiological dormancy, when their bodily functions, including respiration and blood circulation, slow down dramatically.

Thus, melatonin serves as a vital seasonal time cue that may help animals keep their internal diurnal rhythms synchronized with natural cycles of light and dark.

If you do not have this daily change (diurnal rhythm) in cortisol levels, you may have overactive adrenal glands.

Most anterior pituitary hormones exhibit a diurnal rhythm of release, which is subject to modification by stimuli influencing the hypothalamus.

Knowing the diurnal rhythm of teenagers I didn't expect to see Kit before noon, so I threw on my gear and hiked to the gym.

Usually the OGTT is performed in the morning as glucose tolerance can exhibit a diurnal rhythm with a significant decrease in the afternoon.

The hormone has a strong diurnal rhythm; it is released only at night and its production shuts down when daylight reaches the eyes and is perceived by the brain.