Results 161 to 170 of about 1,917 (204)
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Biotin-binding proteins in eggs of oviparous vertebrates
Experientia, 1981Biotin-binding was found in the egg whites and yolks of all 23 avian species studied, and in a turtle, but the amount varied considerably even in related species. There was no clear correlation in biotin-binding between egg white and yolk in various species.
J K, Korpela +3 more
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Lipids of the eggs and neonates of oviparous and viviparous lizards
Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 1999The purpose of this article is to collate the compositional data for the lipids of the eggs and neonates of ten species of lizards displaying a range of parity modes, to highlight emergent trends and to identify some of the physiological changes central to the evolution of viviparity.
B K, Speake, M B, Thompson
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Yolk utilization in Scyliorhinus canicula, an oviparous dogfish
Environmental Biology of Fishes, 1993Using plastic embedding techniques and semithin sections, in order to overcome the difficult sectioning of yolky eggs, we have been able to carry out histological study of the external yolksac from fertilization until birth in the oviparous dogfish Scyliorhinus canicula.
Henri Lechenault +2 more
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Milk provisioning in oviparous caecilian amphibians
ScienceAmong vertebrates, the yolk is commonly the only form of nutritional investment offered by the female to the embryo. Some species, however, have developed parental care behaviors associated with specialized food provisioning essential for offspring survival, such as the production of lipidic-rich parental milk in mammals.
Pedro L. Mailho-Fontana +7 more
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The metabolic cost of reproduction in an oviparous lizard
Functional Ecology, 2000Abstract1. Studies of reproductive effort in ectotherms have focused primarily on the energetic investment in gamete production; much less is known about the indirect energetic costs of reproduction, such as increased metabolic costs of maintenance or activity.2.
M. J. Angilletta, M. W. Sears
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Ovarian folliculogenesis in the oviparous Mexican lizardCtenosaura pectinata
Journal of Morphology, 1996The ovarian follicles of Ctenosaura pectinata exhibit a clear seasonal cycle in morphology. Early in development, each oocyte is surrounded by a granulosa composed of a single layer of cuboidal or squamous cells and thin thecal layers. As folliculogenesis progresses, the granulosa becomes multilayered and composed of three distinct cell types.
María Del Carmen A, Uribe +2 more
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The evolution of oviparity in squamate reptiles: An adaptationist perspective
Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, 2015AbstractPhylogenetically based analyses can suggest directions of evolutionary transitions, based on parsimony, but can never provide unambiguous answers. To clarify the relative frequency of phylogenetic shifts from oviparity to viviparity versus the reverse, we need additional sources of evidence.
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Development of the pulmonary surfactant system in two oviparous vertebrates
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 2000In birds and oviparous reptiles, hatching is often a lengthy and exhausting process, which commences with pipping followed by lung clearance and pulmonary ventilation. We examined the composition of pulmonary surfactant in the developing lungs of the chicken, Gallus gallus, and of the bearded dragon, Pogona vitticeps.
Johnston, Sonya D. +3 more
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Oviparous Hermaphroditic Fish with Internal Self-Fertilization
Science, 1961Adults of Rivulus marmoratus (Cyprinodontidae) contained eggs when dissected or laid eggs when kept alive. They invariably oviposited solo, emitting eggs in various developmental stages. Both juvenescent and senescent fish have functional ovotestes.
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Oviparity in a Sea-Snake (Laticauda colubrina)
Nature, 1930IN view of the fact that all sea-snakes (Hydrophiidae) are generally regarded as viviparous,1 the following occurrence seems worthy of note.
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