Epimorphosis

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epimorphosis

[‚ep·ə′mȯr·fə·səs]
(physiology)
Regeneration in which cell proliferation precedes differentiation.

Epimorphosis

 

(1) Direct postembryonic development of animals whose larvae lack larval organs and differ little from adults. Epimorphosis is the opposite of indirect postembryonic development, or metamorphosis.

(2) A method of regeneration in animals by which the part of an organism or organ surviving after an injury becomes whole without substantial reorganization, as a result of growth and tissue differentiation at the wound surface. Epimorphosis occurs in many invertebrates, such as planarians and annelid worms, as well as in fish, amphibians, and reptiles, whose tails and extremities are capable of regenerating.

(3) A term (in Russian, epimorfoz) introduced by I. I. Shmal’gauzen in 1939 to designate the transition from biological evolution, that is, adaptation to environmental conditions, to social evolution, to dominance over the environment. Epimorphosis has occurred just once as an evolutionary trend in the history of the biosphere, that is, when as a result of the development of the brain and second signaling system man’s arms were no longer needed for locomotion.

References in periodicals archive ?
writing S for the class of split epimorphic trivial extensions, the category C is S-protomodular.
Note that, S being the class of split epimorphic trivial extensions, X is contained in the protomodular core SC given by S-special objects: if X [member of] X, then the first projection [p.sub.1]: X x X [right arrow] X is a trivial extension (because it is a morphism in X).
where f" and f' are split epimorphic trivial extensions.
Since C is an S-protomodular category, the pair ([p.sub.P], t) is jointly strongly epimorphic, thus jointly epimorphic (Remark 3.2).
where f and f' are split epimorphic trivial extensions.
Since the class S we are considering is the class of split epimorphic trivial extensions, then the S-special regular epimorphisms are precisely the normal extensions with respect to the Galois structure [GAMMA] (Definition 2.3).
Indeed, by Proposition 4.4, it is an l-reflexive graph since d is a split epimorphic trivial extension.
So, Mon is an S-protomodular category with respect to the class S of special homogeneous split epimorphisms, which are precisely the split epimorphic trivial extensions of the Galois structure we are considering.
Once again, the split epimorphic trivial extensions are precisely the special homogeneous split epimorphisms, while the normal (= central) extensions are the special homogeneous surjections; the proofs easily follow from those of Proposition 5.4 and Theorem 5.5.
Next, we shall prove that C is an S-protomodular category, where S is the class of split epimorphic trivial extensions.
The quartz forming the epimorphic shell is aligned parallel to the cleavage of the feldspar.