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Dictionary » F » Fluctuations

Fluctuations

Fluctuation

1. A motion like that of waves; a moving in this and that direction; as, the fluctuations of the sea.

2. A wavering; unsteadiness; as, fluctuations of opinion; fluctuations of prices.

3. (Science: medicine) The motion or undulation of a fluid collected in a natural or artifical cavity, which is felt when it is subjected to pressure or percussion.

Origin: L. Fluctuatio; cf. F. Fluctuation.


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Re: blood brain barrier

... blood to the brain. Ion concentration levels in plasma may fluctuate abruptly. The blood- brain barrier protects the brain against surging fluctuations in ion concentrations. The concept of the blood brain barrier was first introduced by Paul Ehrlich. He found that intravenous injection ...

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by lipoflorida
Fri Jun 19, 2009 10:05 am
 
Forum: Physiology
Topic: blood brain barrier
Replies: 2
Views: 702

Re: Electrons... To be or not to be...

The physicists offer a stranger story about the vacuum, where quantum fluctuations cause spontaneous appearance of virtual particles. http://en.wikipedia.org/wiki/Virtual_particles In particular, scroll down to the section "Manifestations" and see ...

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by jonmoulton
Wed Feb 11, 2009 11:14 pm
 
Forum: General Discussion
Topic: Electrons... To be or not to be...
Replies: 14
Views: 683

Properties of water

... [/b]Water has a specific heat (1 cal/g) and high heat of vapourisation (80 cal/g).These physical properties of water help to prevent rapid fluctuations (an effective cooling agent) in body temperature, either hot or cold, and permit small amount of it (perspiration and transpiration) to ...

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by abbassido
Wed Sep 10, 2008 7:33 am
 
Forum: General Discussion
Topic: Properties of water
Replies: 4
Views: 2651

yeast Media

... not. I pH'd the third batch and the liter with the ppt dropped to 5.4. The other without the ppt was 5.8. Can anyone help me? Is it temperature fluctuations in my autoclave? Is it evaporation? anyone's suggestions would be very much appreciated- there must be a sensitive component I'm not considering. ...

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by jamiejlg
Mon Dec 17, 2007 7:45 pm
 
Forum: Cell Biology
Topic: yeast Media
Replies: 2
Views: 725

production of different sized cells in monocots/dicots

well, i would agree that w/ different seasons comes different fluctuations in water supply. And you'd be more likely to find flacid plant cells in absence of water and turgid plant cells in presence of water, but many environments have a fairly steady rate ...

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by utexas1215
Wed Oct 17, 2007 3:23 pm
 
Forum: Botany Discussion
Topic: production of different sized cells in monocots/dicots
Replies: 2
Views: 1475
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