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Cross-section

Cross-section

(Science: physics) Usually refers to the (apparent) area presented by a target particle to an oncoming particle (or electromagnetic wave). This measures the probability of an interaction occuring. For typical interactions between ions and electrons, or between two nuclei, these cross sections are generally measured in barns.

(Science: anatomy) a transverse cut through a structure or tissue. The opposite of a cross-section is a longitudinal section. By analogy, a study may be cross-sectional or longitudinal.


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Re: Natural selection is proven wrong

... even breeds exist, not only between European cattle and zebu but also with yaks (called a dzo), banteng, gaur, and bison ("cattalo"), a cross-genera hybrid. For example, genetic testing of the Dwarf Lulu breed, the only humpless "Bos taurus-type" cattle in Nepal, found them ...

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by GaryGaulin
Tue Sep 01, 2009 4:51 pm
 
Forum: Evolution
Topic: Natural selection is proven wrong
Replies: 177
Views: 16301

Re:

... have three more genes than domestic camels and so they have concluded that they are a completely different species. F1 Camel Is the result of cross breeding of Dromedary and Bactrian camel. This method of mating is prevalent in Afghanistan, Iran, Russia, and Turkey. Crossbreeding generally ...

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by GaryGaulin
Tue Sep 01, 2009 12:22 am
 
Forum: Evolution
Topic: Natural selection is proven wrong
Replies: 177
Views: 16301

Natural selection is proven wrong

... have three more genes than domestic camels and so they have concluded that they are a completely different species. F1 Camel Is the result of cross breeding of Dromedary and Bactrian camel. This method of mating is prevalent in Afghanistan, Iran, Russia, and Turkey. Crossbreeding generally ...

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by gamila
Mon Aug 31, 2009 4:37 pm
 
Forum: Evolution
Topic: Natural selection is proven wrong
Replies: 177
Views: 16301

How does Head To Head Telomere Fusion express itself?

... to either break off and freely go with the rest of the chromosome, or stay together and stall the cell cycle. Now in Meiosis, there are chiasmata/crossingover going on, but that is just when the chromosome is decondensed and supporting proteins help in the process. After the process is done, the ...

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by kolean
Fri Aug 28, 2009 10:34 pm
 
Forum: Cell Biology
Topic: How does Head To Head Telomere Fusion express itself?
Replies: 3
Views: 63

Can a turtle and a frog breed?

My son came home from school with the assignment of researching whether a cross between a turtle and a frog exists. We didn"t find any, but of course, I, being a bored housewife, couldn't let it go and kept looking. I came up with the theory that they couldn't ...

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by jbfurby
Thu Aug 27, 2009 2:07 am
 
Forum: General Discussion
Topic: Can a turtle and a frog breed?
Replies: 1
Views: 88
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