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Dictionary » N » Niches

Niches

niche

A cavity, hollow, or recess, generally within the thickness of a wall, for a statue, bust, or other erect ornament. Hence, any similar position, literal or figurative. Images defended from the injuries of the weather by niches of stone wherein they are placed. (Evelun)

Origin: F, fr. It. Nicchia, prop, a shell-like recess in a wall, fr. Nicchio a shellfish, mussel, fr. L. Mytilus.


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Stem and Progenitor Cell Questions

... lineage, blood cell lineage, neuron cell lineage, etc.). 2. Progenitor cells are found all over the embryo. In fact, Stem Cells are only found in niches of the embryo. The 4 cell stage of many zygotes are totipotent. In that, you can separate the 4 cells and they will form 4 perfect organisms. ...

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by kolean
Wed Sep 02, 2009 11:08 pm
 
Forum: Cell Biology
Topic: Stem and Progenitor Cell Questions
Replies: 2
Views: 30

New perspectives in theory of evolution

... easily record them. Just from an ecological view, there have to be many more animal than plant species (and even more for bacteria), because the niches for them are much more numerous.

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by Darby
Mon Jun 01, 2009 12:28 pm
 
Forum: Evolution
Topic: New perspectives in theory of evolution
Replies: 4
Views: 1534

Natural selection is proven wrong

... doesn't explain how the mechanism works. Given that the seas where it happened were almost empty of multicellular life, this left open countless niches for an evolving species to exploit. I think the recent development of multicellular animals created the perfect conditions for such an explosion ...

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by GaryGaulin
Wed Apr 29, 2009 9:53 am
 
Forum: Evolution
Topic: Natural selection is proven wrong
Replies: 177
Views: 16351

Natural selection is proven wrong

... from an evolutionary point of view. Given that the seas where it happened were almost empty of multicellular life, this left open countless niches for an evolving species to exploit. I think the recent development of multicellular animals created the perfect conditions for such an explosion ...

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by alextemplet
Tue Apr 28, 2009 7:09 pm
 
Forum: Evolution
Topic: Natural selection is proven wrong
Replies: 177
Views: 16351

Natural selection is proven wrong

... forms appeared, there would be an explosion of biodiversity as all sorts of phyla (body plans) evolved to take advantage of the many unexploited niches available. To claim that the presence of cancer invalidates natural selection is foolish. As Astus pointed out, the real reason we have such ...

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by alextemplet
Wed Apr 22, 2009 11:44 pm
 
Forum: Evolution
Topic: Natural selection is proven wrong
Replies: 177
Views: 16351
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