Results 161 to 170 of about 33,233 (205)
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Early ontogeny of rhythm generation and control of breathing
Respiration Physiology, 1997The ability of central networks to produce rhythmic motor behaviours linked to the respiratory function, is a remarkably conserved property of the brainstem reticular formation in vertebrates. Conserved cellular and molecular mechanisms also underlie the early embryonic development of the brainstem, leading to a segmented rhombencephalon in all ...
V, Borday, G, Fortin, J, Champagnat
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Ontogeny and behaviour of early macrophages in the zebrafish embryo
Development, 1999Abstract In the zebrafish embryo, the only known site of hemopoieisis is an intra-embryonic blood island at the junction between trunk and tail that gives rise to erythroid cells. Using video-enhanced differential interference contrast microscopy, as well as in-situ hybridization for the expression of two new hemopoietic marker genes ...
P, Herbomel, B, Thisse, C, Thisse
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Early Ontogeny of Introduced Hydrangea Species
Russian Journal of Developmental Biology, 2021This work describes early ontogeny of Hydrangea L. species introduced into the Bashkir Cis-Urals. In Hydrangea, the four distinct age-states of the virginile ontogenetic period, namely seedlings, juveniles, immatures and mature vegetative plants, were identified and their morphologic features and development chronology were described. Hydrangeas become
F. K. Murzabulatova +2 more
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Early ontogeny of germinal center formation in the chicken
Developmental & Comparative Immunology, 1978Germinal center formation was studied in the spleen of young chickens immunized in ovo and at the time of hatching. When immunization was performed on day 18 in ovo and on the day of hatching, the first germinal centers were observed at 4 days. This is markedly earlier than in unimmunized chickens, where the first germinal centers appear at the age of ...
O, Vainio, M K, Viljanen, A, Toivanen
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The primate hippocampus: ontogeny, early insult and memory
Current Opinion in Neurobiology, 2005Recent evidence suggests that in primates, as in rodents, the hippocampus shows a developmental continuum that affects memory abilities from infancy to adulthood. In primates relatively few hippocampal-dependent abilities (e.g. some aspects of recognition memory) are present in early infancy, whereas others (e.g.
Jocelyne, Bachevalier +1 more
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Early ontogeny of the human femoral bicondylar angle
American Journal of Physical Anthropology, 1994AbstractThe presence of a femoral bicondylar angle consistently and significantly greater than 0° has been a hallmark of hominid bipedality, but its pattern of development has not been documented. We have therefore compiled cross‐sectional data on the development of the articular bicondylar angle for a clinical sample of modern humans and of the ...
C, Tardieu, E, Trinkaus
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Development of immune responses in early pig ontogeny
Veterinary Immunology and Immunopathology, 1994Low amounts of immunoglobulins, produced without any known cause of stimulation, can be detected in sera and cells of fetal and colostrum deprived newborn pigs. These immunoglobulins are believed to represent the preimmune antibody repertoire on the basis of their polyspecificity and reactivity against self antigens.
H, Tlaskalova-Hogenova +5 more
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Early Ontogeny in the Siberian Sturgeon
2017This chapter is a synthesis of published information describing the development of Siberian sturgeon during the embryonic (from fertilization to hatching), prelarval (from hatching to the onset of exogenous feeding) and larval (from first feeding to the juvenile stage) periods.
Enric Gisbert, Yoon Kwon Nam
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Protein digestion in early postnatal ontogeny
Bulletin of Experimental Biology and Medicine, 1974Newborn rats aged 3 days, removed from their mothers for 3 h, were given 0.4 ml of a 20% aqueous solution of human albumin by mouth. Pieces of tissue from the proximal jejunum and the renal cortex of the animals were investigated electron-microscopically by Gomori's reaction for acid phosphatase.
K. A. Zufarov +2 more
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The allometry of leaf form in early plant ontogeny
Bulletin of Mathematical Biology, 2005A general allometric model between metabolic rate and body size has been derived for early plant ontogeny. The scaling exponent is (2+N/6)/3, where N is the cell's degree of freedom of motion. For early plant ontogeny N=2, our prediction agrees well with Sack et al.'s observation [Sack, L., Maranon, T., Grubb, P.J., 2002. Science 295, 1923].
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