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Exposure

Exposure

(Science: radiobiology) a quantitative measure of x or gamma radiation at a certain place, based on its ability to produce ionisation in air. The former special unit of exposure was the roentgen (R). 1R = 2.58 x 10-4 C/kg. In the international system (si unit), the special unit is coulomb per kilogram. (exposure also is frequently used as a synonym for irradiation).


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Re: Vitamin D absorption for different skin types

This seems to be an area that is just beginning to draw research interest. Darker skin evolved in high light-exposure populations to protect deeper skin layers from UV damage, but tones lightened in pops with lower exposure, to allow enough UV to reach the D-generating skin tissues. ...

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by Darby
Tue Jul 15, 2014 7:39 pm
 
Forum: Human Biology
Topic: Vitamin D absorption for different skin types
Replies: 1
Views: 572

Re: biology urgent need help?

... clock going, by which they like to be in light or darkness for N hours. Their response should vary considerably according to the length of their exposure to artificial light.

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by animartco
Sun May 18, 2014 11:57 am
 
Forum: General Discussion
Topic: biology urgent need help?
Replies: 3
Views: 1638

Humans Natural Habitat/Optimal Environment

... we be living? For years I have been pondering about Homo Sapiens natural habitat. This includes all aspects from lifestyle to nutrition to sun exposure, etc.... It started when i was getting into instinctive nutrition. I was eating a lemon thinking... Why does my body love citrus so much? Did ...

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by Anopsology
Sun Mar 02, 2014 10:30 pm
 
Forum: Evolution
Topic: Humans Natural Habitat/Optimal Environment
Replies: 2
Views: 3895

Re: Are predators always smarter than their prey?

... can be innate, for example, animals can identify predators as a threat even if they have never encountered them before , or learned only after exposure to a predatory threat which they did not provide any examples or detail explanation

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by Gannet
Mon Feb 24, 2014 10:18 am
 
Forum: Zoology Discussion
Topic: Are predators always smarter than their prey?
Replies: 14
Views: 8722

Re: Am I the Next Step in Human Evolution?

... individual but that is all I am gathering. I am not going to feign a vast knowledge regarding the immune system, but it could have been due to exposure to certain viruses as a child or just a matter of luck in not contracting the illnesses. But a strong immune system should be part of evolution, ...

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by badgertoes
Sat Dec 28, 2013 8:31 am
 
Forum: Evolution
Topic: Am I the Next Step in Human Evolution?
Replies: 23
Views: 31079
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