What's the difference between heterochrony and species?
Heterochrony
Definition:
(n.) In evolution, a deviation from the typical sequence in the formation of organs or parts.
Example Sentences:
(1) A detailed analysis of the frontal, medial prefrontal and hippocampal regions also shows a heterochrony within these regions.
(2) These groups correspond to different stages of neuroblast development in vivo and their presence in the tissue cultures of different brain regions reflects the heterochrony of cell development in these regions.
(3) Direct development is achieved primarily by heterochrony, that is, by the abbreviation or elimination of larval developmental processes and the acceleration of processes involved in development of adult features.
(4) Ontogeny in the tube-crested dinosaur Parasaurolophus (Hadrosauridae) and heterochrony in hadrosaurids.
(5) The concepts of chronogenetics, heterochrony, and developmental field defects appear relevant to yet another set of patients with chromosome anomalies.
(6) It has been pointed out, that there is a complex heterochrony of regional development in the brain.
(7) Certain single malformations such as holoprosencephaly immediately suggest heterochrony by their resemblance to antecedent phylogenetic or embryologic structures.
(8) Some male sterile mutations can decouple the development of the different components of a germ cell, i.e., they may lead to a heterochrony of the development of the different subcellular structures, or they may permit the differentiation of some components of a germ cell even in the complete absence of an organelle.
(9) He has only mentioned the concept of heterochrony to which we give much more importance nowadays.
(10) The role of altered developmental timing or heterochrony in morphologic evolution has intrigued classical and modern biologists.
(11) During prenatal life of monkey and man in the development of the frontal area the phenomena of heterochrony (common for both species) and anabolia (peculiar for man only) are observed (the appearance of new more complex structures).
(12) It is theorized that hormones are a major factor in the non-random regulation of cellular heterochrony in tumourigenesis.
(13) The data obtained suggest a heterochrony and different rate of the functional callosal connexions maturation in projection and associative areas of the cortex.
(14) The perspective of heterochrony stresses the molecular history and hierarchy which is recapitulated with each pregnancy, and reconciles apparent discrepancies between the rates of molecular and morphologic evolution.
(15) In terms of heterochrony such a pattern most likely is the result of a process termed "acceleration", i.e.
(16) Notwithstanding this, gross regularities of heterochrony in the neurogenetic behavior of the different segments lead to a definition of elemental longitudinal compartments of the forebrain and mesencephalon (floor, paramedian, basal, and alar regions) on the basis of precocious differentiation of the basal region and retarded differentiation of the paramedian and alar regions.
(17) Molecular mechanisms underlying heterochrony are thereby described.
(18) We propose that such a shift in relative timing of the developmental phenomena involved inhibits pigment cell migration in embryos of the white axolotl mutant and, accordingly, that the restricted pigmentation of the mutant larva is generated through heterochrony.
(19) In its normal ontogeny, Hydractinia symbiolongicarpus, a closely related hydractiniid hydroid, not only shows morphological heterochrony similar to that induced in P. carnea by DNP, but also shows a pattern of gastrovascular flow similar to that observed in P. carnea under treatment with DNP.
(20) In view of elucidating the origin of this heterochrony, we make an electrophoretic study of the different extracts from juveniles, adults in activity, in natural sleep and awakning.
Species
Definition:
(n.) Visible or sensible presentation; appearance; a sensible percept received by the imagination; an image.
(n.) A group of individuals agreeing in common attributes, and designated by a common name; a conception subordinated to another conception, called a genus, or generic conception, from which it differs in containing or comprehending more attributes, and extending to fewer individuals. Thus, man is a species, under animal as a genus; and man, in its turn, may be regarded as a genus with respect to European, American, or the like, as species.
(n.) In science, a more or less permanent group of existing things or beings, associated according to attributes, or properties determined by scientific observation.
(n.) A sort; a kind; a variety; as, a species of low cunning; a species of generosity; a species of cloth.
(n.) Coin, or coined silver, gold, ot other metal, used as a circulating medium; specie.
(n.) A public spectacle or exhibition.
(n.) A component part of compound medicine; a simple.
(n.) An officinal mixture or compound powder of any kind; esp., one used for making an aromatic tea or tisane; a tea mixture.
(n.) The form or shape given to materials; fashion or shape; form; figure.
Example Sentences:
(1) The variation in thickness of the LLFL may modulate the species causing damage to the cells below it.
(2) Comparison of the S100 alpha-binding protein profiles in fast- and slow-twitch fibers of various species revealed few, if any, species- or fiber type-specific S100 binding proteins.
(3) The data indicate that ebselen is likely to be useful in the therapy of inflammatory conditions in which reactive oxygen species, such as peroxides, play an aetiological role.
(4) These membrane perturbation effects not observed with bleomycin-iron in the presence of a hydroxyl radical scavenger, dimethyl thiourea, or a chelating agent, desferrioxamine, were correlated with the ability of the complex to generate highly reactive oxygen species.
(5) When compared with lissencephalic species, a great horizontal fibrillary system (which is vertically arranged in gyral regions) was observed in convoluted brains.
(6) The TxA2 antagonistic effects of KW-3635 were compared with that of daltroban in PRP from various animals species.
(7) Only the approximately 2.7 kb mRNA species was visualized in Northern blots of total cellular and poly(A+) RNA isolated from cardiac ventricular muscle.
(8) Comparison of developmental series of D. merriami and T. bottae revealed that the decline of the artery in the latter species is preceded by a greater degree of arterial coarctation, or narrowing, as it passes though the developing stapes.
(9) The immunological methods based on the use of a flagellum-specific serum have confirmed the presence of a common flagellum antigen for all Legionella species described to date.
(10) This observation not only provides definitive evidence for the photogeneration of O2-, but also indicates that only a fraction of this species is transformed into H2O2 in the absence of SOD.
(11) To further characterize the molecular forms of GnRH in each species, the extracts were injected into a high pressure liquid chromatograph (HPLC).
(12) Each species has approximately 500 core histones cluster repeats per haploid genome.
(13) After immunoadsorbent purification, the final step in a purification procedure similar to that adopted for colon cancer CEA, two main molecular species were identified: 1) Material identical with colon cancer CEA with respect to molecular size, PCA solubility, ability to bind to Con A, and most important the ability to bind to specific monkey anti-CEA serum.
(14) Both of these species belong to the serotype B. MCAs T11 and T15, the first recorded with a specificity for only sub-serotype A2 EF, were tested further against 28 sub-serotype A2 and three sub-serotype A2B2EFs from L. tropica strains.
(15) The results suggest that involucrin-like proteins have a wider species distribution than originally appreciated.
(16) Sequence specific binding of protein extracts from 13 different yeast species to three oligonucleotide probes and two points mutants derived from Saccharomyces cerevisiae DNA binding proteins were tested using mobility shift assays.
(17) The genome characterization of the typing strains for all 13 species of the genus Staphylococcus, included into the Approval List of the Names of Bacterial (1980), is presented.
(18) Two lectins, wheat germ agglutinin (WGA) and peanut agglutinin (PNA), were used to compare domains within the interphotoreceptor matrices (IPM) of the cat and monkey, two species where the morphological relationship between the retinal pigment epithelium (RPE) and photoreceptors is distinctly different.
(19) The regional distribution of the receptor showed insignificant species differences.
(20) Temelastine produces these species-specific changes by enhancing thyroxine clearance from the circulation in the rat, but not in the dog or mouse.