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Stratum

Definition

noun, plural: strata

(1) (histology) Any from the layers of tissues arranged one atop another, thus forming an anatomical structure

(2) (ecology) A layer of plants or vegetation usually of the same or similar height

(3) (general) One of the stack of horizontal layers


Supplement

(Histology) The skin is an example of biological material comprised of several strata (or layers of tissues).

(Ecology) In a plant community, a stratum implicates dominance of that plant species.


Word origin: Latin strātum from strātus or sternere (to spread, strew)

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Does Langerhan cell in epidermis change to macrophage?

... monocytes(lymphocytes) in the blood, slips it way through into the tissue and differentiate into macrophages. Langerhans cells are found in the stratum spinosum in the epidermis of the skin. I know that langerhans cells are derived from monocytes but do langerhans cells undergo changes and become ...

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by AUY11345303
Tue Dec 20, 2011 3:58 pm
 
Forum: Human Biology
Topic: Does Langerhan cell in epidermis change to macrophage?
Replies: 0
Views: 1196

Re: Theories - Origin of Life

... does the fossil record falsify the evolution? Origin of Species Chapter 9 Darwins words “Why then is not every geological formation and every stratum full of such intermediate links? Geology assuredly does not reveal any such finely graduated organic chain; and this, perhaps, is the most obvious ...

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by scottie
Sun Dec 18, 2011 3:40 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
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Views: 906969

Re: Is DNA living or non-living thing?? get the answer here

... phenomena are demonstrated also in Earth’s smallest, base organisms, in the genes and genomes of multi-celled organisms, in our primal 1st stratum and 2nd stratum base organisms. A very good reason to smile. Now an interesting chain is exposed to our view, the Genes-Virtual Reality Chain, ...

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by Dov Henis
Thu Nov 24, 2011 3:22 pm
 
Forum: Molecular Biology
Topic: Is DNA living or non-living thing?? get the answer here
Replies: 24
Views: 54664

Re: Experimental evidence for evolution

... advocating punctuated equilibrium? Chapter 9 On the Imperfection of the Geological Record “Why then is not every geological formation and every stratum full of such intermediate links? Geology assuredly does not reveal any such finely graduated organic chain ; and this, perhaps, is the most ...

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by jevg
Mon Sep 06, 2010 4:35 pm
 
Forum: Evolution
Topic: Experimental evidence for evolution
Replies: 103
Views: 177622

Re: Marine Invertebrates and Evolution

... of literal creationism. Why? Because the fossil record doesn't indicate the simultaneous deaths of every "kind" on one single stratum, corresponding to either the beginning of death after the Fall, or to the massive death which would follow the Flood. In order to argue using ...

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by Lenoxus
Mon Apr 26, 2010 1:56 pm
 
Forum: Evolution
Topic: Marine Invertebrates and Evolution
Replies: 2
Views: 2969
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