FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2002596073> ?p ?o ?g. }

• W2002596073 endingPage "52" @default.
• W2002596073 startingPage "35" @default.
• W2002596073 abstract "Placental sharks sequentially utilize three modes of embryonic/fetal nutrition to nourish their developing young—viz., vitellogenesis, histotroph secretion, and hematrophic placentation. These are the principal modes employed by vertebrates in general. The progressive shift from reliance on yolk, to histotroph, then to the placenta mirrors the probable stages in the evolution of placentation in sharks. Preimplantation shark embryos begin their ontogenetic development by reliance on yolk. In vitellogenesis, energy-rich precursors of hepatic origin are stored in oocytes prior to ovulation. Following fertilization, embryogenesis and fetal development proceed at the expense of the yolk stores sequestered in the yolk sac. Yolk is made available to the developing young by two means. Yolk is partially solubilized in the yolk syncytium of the yolk sac and subsequently modulated through the yolk sac endoderm. Yolk metabolites are then transported across the vitelline endothelium to reach the fetal circulation. Yolk granules are physically transported to the fetal gut by ciliated cells lining the ductus vitellointestinalis. The ductus is an endodermally lined conduit that extends from the yolk sac to connect to the fetal gut where digestion and absorption occur. Following depletion of the yolk stores and prior to development of the placenta, nutrient substances may be supplied to the fetus by secretory activity of the uterus in the form of histotroph. Histotroph may then be ingested and/or absorbed. In the transition from the yolk-reliant and histotrophic phases to a placental situation, there is a coincident shift in the function of the maternal uterus to one of a nutrient-producing or -transporting organ. Essential adaptations of the uterus include: enhanced secretory function, expansion to accommodate the embryos, respiration, osmoregulation, waste disposal, and protection of the young. As the yolk sac differentiates into a placenta, focal areas of the uterus become modified as uterine attachment sites. It is at the utero-placental complex that nutrient and metabolic exchange between mother and fetus will be effected. Paraplacental uterine sites may also continue to play a role in the elaboration of histotroph. The placenta is specialized into two segments: a proximal, smooth portion that has characteristics of a steroid-producing tissue and a more richly vascularized distal portion that is a nutrient-transporting tissue. Evolution of placentation involves modifications of existing maternal and fetal membranes. The ontogenetic transformation of the shark oviduct into a functional uterus for the retention and metabolic support of developing young certainly is modulated by endocrine regulation. In the developing fetus, the yolk sac and stalk display terminal differentiation into a regionally specialized placenta and an umbilical cord respectively. Accessory vascular structures of the umbilical cord, termed appendiculae, are present in some species." @default.
• W2002596073 created "2016-06-24" @default.
• W2002596073 creator A5056367966 @default.
• W2002596073 date "1989-01-01" @default.
• W2002596073 modified "2023-09-27" @default.
• W2002596073 title "Evolution and morphogenesis of the placenta in sharks" @default.
• W2002596073 cites W1496455504 @default.
• W2002596073 cites W1543670588 @default.
• W2002596073 cites W1574043004 @default.
• W2002596073 cites W1581269643 @default.
• W2002596073 cites W1595853000 @default.
• W2002596073 cites W1598685556 @default.
• W2002596073 cites W1972220188 @default.
• W2002596073 cites W1972788430 @default.
• W2002596073 cites W1975784872 @default.
• W2002596073 cites W1977644858 @default.
• W2002596073 cites W1986066962 @default.
• W2002596073 cites W1995105231 @default.
• W2002596073 cites W2018577034 @default.
• W2002596073 cites W2030040346 @default.
• W2002596073 cites W2039270144 @default.
• W2002596073 cites W2048936228 @default.
• W2002596073 cites W2054662723 @default.
• W2002596073 cites W2061051176 @default.
• W2002596073 cites W2074897893 @default.
• W2002596073 cites W2075269677 @default.
• W2002596073 cites W2086523920 @default.
• W2002596073 cites W2088933278 @default.
• W2002596073 cites W2100634270 @default.
• W2002596073 cites W2114069742 @default.
• W2002596073 cites W2161334091 @default.
• W2002596073 cites W2265975574 @default.
• W2002596073 cites W2328896247 @default.
• W2002596073 cites W2334168477 @default.
• W2002596073 cites W342440836 @default.
• W2002596073 cites W4230434120 @default.
• W2002596073 doi "https://doi.org/10.1002/jez.1402520406" @default.
• W2002596073 hasPublicationYear "1989" @default.
• W2002596073 type Work @default.
• W2002596073 sameAs 2002596073 @default.
• W2002596073 citedByCount "51" @default.
• W2002596073 countsByYear W20025960732013 @default.
• W2002596073 countsByYear W20025960732014 @default.
• W2002596073 countsByYear W20025960732015 @default.
• W2002596073 countsByYear W20025960732016 @default.
• W2002596073 countsByYear W20025960732017 @default.
• W2002596073 countsByYear W20025960732018 @default.
• W2002596073 countsByYear W20025960732019 @default.
• W2002596073 countsByYear W20025960732020 @default.
• W2002596073 countsByYear W20025960732021 @default.
• W2002596073 countsByYear W20025960732022 @default.
• W2002596073 countsByYear W20025960732023 @default.
• W2002596073 crossrefType "journal-article" @default.
• W2002596073 hasAuthorship W2002596073A5056367966 @default.
• W2002596073 hasConcept C105702510 @default.
• W2002596073 hasConcept C126322002 @default.
• W2002596073 hasConcept C134018914 @default.
• W2002596073 hasConcept C16685009 @default.
• W2002596073 hasConcept C172680121 @default.
• W2002596073 hasConcept C196843134 @default.
• W2002596073 hasConcept C2776690073 @default.
• W2002596073 hasConcept C2776953305 @default.
• W2002596073 hasConcept C2777043721 @default.
• W2002596073 hasConcept C2777702977 @default.
• W2002596073 hasConcept C2779066055 @default.
• W2002596073 hasConcept C2779234561 @default.
• W2002596073 hasConcept C2781321622 @default.
• W2002596073 hasConcept C45167389 @default.
• W2002596073 hasConcept C505870484 @default.
• W2002596073 hasConcept C54355233 @default.
• W2002596073 hasConcept C56366318 @default.
• W2002596073 hasConcept C71315377 @default.
• W2002596073 hasConcept C71924100 @default.
• W2002596073 hasConcept C86803240 @default.
• W2002596073 hasConcept C87073359 @default.
• W2002596073 hasConcept C95444343 @default.
• W2002596073 hasConceptScore W2002596073C105702510 @default.
• W2002596073 hasConceptScore W2002596073C126322002 @default.
• W2002596073 hasConceptScore W2002596073C134018914 @default.
• W2002596073 hasConceptScore W2002596073C16685009 @default.
• W2002596073 hasConceptScore W2002596073C172680121 @default.
• W2002596073 hasConceptScore W2002596073C196843134 @default.
• W2002596073 hasConceptScore W2002596073C2776690073 @default.
• W2002596073 hasConceptScore W2002596073C2776953305 @default.
• W2002596073 hasConceptScore W2002596073C2777043721 @default.
• W2002596073 hasConceptScore W2002596073C2777702977 @default.
• W2002596073 hasConceptScore W2002596073C2779066055 @default.
• W2002596073 hasConceptScore W2002596073C2779234561 @default.
• W2002596073 hasConceptScore W2002596073C2781321622 @default.
• W2002596073 hasConceptScore W2002596073C45167389 @default.
• W2002596073 hasConceptScore W2002596073C505870484 @default.
• W2002596073 hasConceptScore W2002596073C54355233 @default.
• W2002596073 hasConceptScore W2002596073C56366318 @default.
• W2002596073 hasConceptScore W2002596073C71315377 @default.
• W2002596073 hasConceptScore W2002596073C71924100 @default.
• W2002596073 hasConceptScore W2002596073C86803240 @default.
• W2002596073 hasConceptScore W2002596073C87073359 @default.
• W2002596073 hasConceptScore W2002596073C95444343 @default.

• next