(1) Studies of ontogenesis contribute to better understanding of regulatory events underlying the striking heterogeneity in B-cell differentiation pathways employed in the human mucosal immune system.
(2) During human ontogenesis the antigen appears very early.
(3) Using the cluster analysis of objects in the space of physique factors the objective classification of peripubertal stage of ontogenesis in girls has been constructed.
(4) Enzymo-histochemical study of the human joint cartilage in ontogenesis showed a high 5-nucleotidase activity at all stages of human development.
(5) In the whole, the results indicate the existence of marked genetic determination of physique's growth and development in a stage under study of human ontogenesis.
(6) Content of soluble and insoluble collagen, glycosamine glycans, glycoproteins, lipids and nucleic acids was studied in rat lungs during postnatal ontogenesis (up to 32 months).
(7) At all stages of ontogenesis glycogen phosphorylase (EC 2.4.1.1) from liver chick embryos in represented by an isoenzyme whose properties are close to those of isoenzyme IL or F. Total enzyme activity (a+b forms) from the 8th day of development up to hatching gradually increases 1.5-fold, a practically complete activation of enzyme being observed by the end of embryogenesis.
(8) Using material on the evolution of the fundus of the oral cavity in amphibians, four principles were established for the origin of heterochronia: efficiency of ontogenesis; adaptability of an earlier (than in ancestors) beginning for functioning of traits; loss of the adaptive significance of a trait at a previous stage, but a preservation of it at a subsequent stage; and, a prolongation of the adaptive significance of a trait at later stages.
(9) During a phase of relatively stable tapping performance regular fluctuations in the tapping frequency occurred with a period duration between 0.67 and 13.3 s. These oscillations of the motor activity developed during ontogenesis: The slow fluctuations were found in all groups, whereas those with shorter periods were best pronounced in the older children.
(10) The results show that a functional insulin receptor can be detected at the early stages of fetal development in both tissues and is conserved throughout ontogenesis to adulthood.
(11) The concept is based on the data on the philo- and ontogenesis, reactivity and adaptability+, complexity and dynamism, stages and phases of the process.
(12) Therefore, thymus active fractions obtained from sheep at different stages of ontogenesis had a stimulating effect on cell proliferation and immunogenesis.
(13) By means of biomicroscopy main regularities in development of the skin capillary network have been revealed in the nail torus in the postnatal ontogenesis.
(14) The specification of pathomorphological changes occurring during Varestrongylus capreoli ontogenesis was studied on the basis of different forms of inflammation.
(15) Quite possibly they may be actively involved in the pathological process not only in the prenatal, but also in some cases in the postnatal ontogenesis.
(16) The appearance of microtubules and the development of their interrelations with the synaptic area and the nuclear envelope in differentiating neuroblasts from the anterior horn of the spinal cord in the first half of human antenatal ontogenesis was traced by methods of electron microscopy.
(17) The ontogenesis of vasopressin receptors in the rat collecting duct was studied by measuring the binding of [1-(beta-mercapto-beta,beta-cyclopentamethylenepropionic acid),2-O-methyltyrosine,4-threonine,8-ornithine,9-125I-tyrosylamide+ ++]-vasotocin (125I-d(CH2)5[Tyr(Me)2,Thr4,Tyr-NH(9)2]-OVT) to isolated cortical collecting ducts (CCD), outer medullary collecting ducts (OMCD) and inner medullary collecting ducts (IMCD) microdissected from collagenase-treated kidneys of 2- to 34-day-old rats and adult animals.
(18) The polyploidization of somatic cells during the ontogenesis is shown to be the natural phenomenon for most plant tissues and it is correlated with the intensification of cellular metabolism.
(19) The greatest quantity of these substances concentrate in brain and liver tissues and in brain tissues the pesticides accumulate during all the period of ontogenesis, but in liver - only during last months of active feeding period.
(20) The functional implications of the location and structure of the radial fibers during ontogenesis are discussed.
Ontogenetic
Definition:
(a.) Of or pertaining to ontogenesis; as, ontogenetic phenomena.
Example Sentences:
(1) The involvement of phospholipids into the function of the hormonoreactive system realizing the catecholamine action on the skeletal muscle metabolism was studied at different stages of chicken ontogenetic development.
(2) Seizures elicited by posture change and intraperitoneal administration of convulsants were studied ontogenetically in the Mongolian gerbil (Meriones unguiculatus).
(3) Phylogenetic and ontogenetic justifications for this organization are adduced.
(4) The much less rapid ontogenetic decline seen for the predominant dopamine metabolite, homovanillic acid (HVA), indicates that differing factors affect CSF levels of the two acid metabolites.
(5) Further, there was no evidence of ontogenetic modification of the amylase isozymes.
(6) Consequently, the present results may mean that the studies using uptake of [3H]GABA, [3H]ACHC, or [3H]DABA as a specific marker for GABAergic neurons differentiating during the ontogenetic development of the central nervous system may have to be interpreted with caution.
(7) Ontogenetic changes of the total activity and the subcellular distribution of Ca2+-activated, phospholipid-dependent protein kinase (protein kinase C) were investigated in the cat visual cortex.
(8) The correlation with an anatomically and ontogenetically well-founded classification provides knowledge for use in the individual case which may be helpful in selecting the proper surgical procedure, in establishing a schedule, and in providing the prognosis.
(9) Plastic responses in leaf form resulting from ontogenetic or external influences are initiated very early in primordial development and are brought about by effects on the rate and direction of cell division and expansion in different regions of the primordium.
(10) Ontogenetic data on developmental stages I-IV of 3678 melanosomes based on geometric considerations (length, width, shape, and area) showed that MSH did not induce a complete transformation from spherical phaeomelanosomes to elliptical eumelanosomes.
(11) A certain recapitulation of the ontogenetic development of neuronal differentiation in PNETs is given by the fact that chromogranin A immunoreactivity can regularly be seen already in poorly differentiated neurons and synaptophysin in well-differentiated ones.
(12) Intercorrelations of dipeptidase activities vary ontogenetically, which is consistent with the need for coordinate expression of these enzymes during certain developmental stages.
(13) The ontogenetic study of pyruvate kinase in the brain and liver tissues was performed in different batches of rats, from the foetus at the 13th day of gestation to the adult subject.
(14) Ontogenetic differences in selenium metabolism could be one of the factors underlying the differences in the response of the young and the adult rats to toxic doses of selenite.
(15) It appeared only in the early phases of ontogenetic development (up to the age of 15 days); cataract was not observed during later development.
(16) The regimen of stress used is known to be associated with an abnormal ontogenetic pattern of testosterone secretion from the fetal testes.
(17) The backscattered electron imaging mode of the scanning electron microscope was used to study the ontogenetic acquisition of argyrophilia in Pneumocystis carinii in rats.
(18) The existence of an ontogenetic shift of tonotopic organization throughout the auditory pathway concomitant with cochlea maturation is a matter of controversy.
(19) This is similar to the ontogenetic sequence typically found for immune reactivity in vertebrates.
(20) The ontogenetic development of histamine was studied in the diabetes insipidus rat to clarify the possible interference between the lack of vasopressin and the development of histaminergic systems in the hypothalamus.