Skip to main content

Questions tagged [circadian-rhythms]

Any biological process which displays an endogenous, entrainable oscillation of time.

15 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
3 votes
0 answers
82 views

Blooming at moonlight

At the moment a popular question in the physics SE community is about night-blooming cereus: this flower blooms at full moon, that is it is capable of making difference between the moonlight and ...
Roger V.'s user avatar
  • 3,852
3 votes
0 answers
380 views

What is the purpose of Prostaglandin F2-alpha and the Prostaglandin F receptor in the melatonin cell signaling pathway?

I've been doing a lot of research recently on the melatonin cell signaling pathway for an extra credit project at school. I've included an image in this post, which is a diagram of the MT1 pathway. It ...
Baylor Norris's user avatar
2 votes
0 answers
73 views

Rationale for two-components in feedback loop of circadian molecular clock

The circadian clock in humans and fruit flies involves a feedback loop in which the active components are protein heterodimers. This is illustrated for humans in the diagram below: The nuclear ...
yoshi's user avatar
  • 121
2 votes
0 answers
35 views

Do circadian hormones fluctuations follow sleeping patterns or the time of day?

It is said that testosterone and cortisol are at their highest early in the morning, at 8 am, and lowest at night. What happens, though, if someone regularly goes to sleep at 8 am and wakes up in the ...
JJrussel's user avatar
  • 121
2 votes
0 answers
27 views

Is there benefit of use of red light over dim white light when interacting with rodents in the dark phase?

I've come across some "percieved wisdom" that rats and mice do not "see" red visible light and so use of this wavelength will allow humans to interact with rats in their active nocturnal phase without ...
Sarra's user avatar
  • 21
2 votes
0 answers
352 views

Circadian rhythm in birds

Animals can use their circadian clocks to determine direction from the position of the sun. In a particular experiment conducted in Iceland, a bird, kept in a cage open to the sky, was trained to ...
biogirl's user avatar
  • 8,601
2 votes
0 answers
122 views

Is there an entry-level circadian model of serotonin, ghrelin, dopamine and the sense of well being?

I've long been interested in circadian rhythms and recently came across a variety of articles that appear to indicate that the following neurotransmitters, transferases and hormones are connected. ...
Alex Stone's user avatar
  • 6,515
2 votes
0 answers
582 views

Can the sleep/wake cycle be influenced by non-visible spectrum electro-magnetic radiation?

I've been reading a few papers on Melanopsin and Suprachiasmatic Nucleus (SCN), and see that the sleep/wake transition is ...
Alex Stone's user avatar
  • 6,515
1 vote
0 answers
48 views

Delay of sleeping on cortisol cycle

I was told that cortisol has to be measured at 9am or 4pm, because those where its peak level. But I wonder if changes on sleep patters affect the cortisol cycle. I mean, if I usually go to sleep ...
Santiago's user avatar
  • 111
1 vote
0 answers
31 views

Does iris color effect the amount of light that reaches photosensitive ganglion cells?

Does eye color (of iris) have any effect on the amount of light reaching retina cells and hence effect melatonin production?
Charlie's user avatar
  • 462
1 vote
0 answers
115 views

How do PER/CRY complexes accumulate in the cytoplasm?

The Period/Cryptochrome (PER/CRY) complex is a heterodimer that transcriptionally regulates circadian rhythm. When it is phosphorylated, it is transported to the nucleus and it inhibits a ...
Glorwynn's user avatar
1 vote
0 answers
339 views

What is the cause of singularity in phase response curve of human sleep and bright light?

I have no background in science as I am a computer programmer, but I am trying to get information on phase response curves, human sleep and exposure to bright light as I am trying to get to grips with ...
Doahh's user avatar
  • 111
0 votes
0 answers
47 views

Temperature-dependence of circadian rythms

A circadian rhythm is a chemical clock. In the absence of light or other stimuli to entrain it, its speed depends on reaction rates. As a rule of thumb reaction rates double every 10C as long as the ...
Kevin Kostlan's user avatar
0 votes
0 answers
27 views

Does sleep schedule affect circadian rhythm?

During the circadian rhythm, the internal human body temperature supposedly peaks around 4-6 pm. Let us assume that the average person goes to bed around 11 pm and sleeps for 8 hours. In that case ...
Ethan's user avatar
  • 204
0 votes
0 answers
37 views

Which genes/proteins constitute the core components of the circadian clock?

What the title says. For instance in Drosophila melanogaster and Mus musculus (see Patke et al. 2020) the CLOCK, CYCLE/BMAL, CRYPTOCHROME, PERIOD setup seems to be conserved. But other components also ...
Dunois's user avatar
  • 176