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THE STRUCTURE, FUNCTION, AND DEVELOPMENT OF THE FOLLICULAR PLACENTA IN THE VIVIPAROUS POECILIID FISH, HETERANDRIA FORMOSA.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	THE STRUCTURE, FUNCTION, AND DEVELOPMENT OF THE FOLLICULAR PLACENTA IN THE VIVIPAROUS POECILIID FISH, HETERANDRIA FORMOSA./
Author:	GROVE, BRYON DENNIS.
Description:	1 online resource (310 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 46-06, Section: B, page: 1841.
Subject:	Zoology. -
Online resource:	click for full text (PQDT)

THE STRUCTURE, FUNCTION, AND DEVELOPMENT OF THE FOLLICULAR PLACENTA IN THE VIVIPAROUS POECILIID FISH, HETERANDRIA FORMOSA.
GROVE, BRYON DENNIS.

THE STRUCTURE, FUNCTION, AND DEVELOPMENT OF THE FOLLICULAR PLACENTA IN THE VIVIPAROUS POECILIID FISH, HETERANDRIA FORMOSA. - 1 online resource (310 pages)

Source: Dissertation Abstracts International, Volume: 46-06, Section: B, page: 1841.

Thesis (Ph.D.)--Clemson University, 1985.

Includes bibliographical references

Embryos of the viviparous poeciliid fish, Heterandria formosa undergo a 3900% increase in dry weight during development, indicating substantial maternal-embryonic nutrient transfer. Gestation occurs within the ovarian follicle. During development, a highly vascularized pericardial sac envelops the embryonic head and has been implicated in metabolite exchange. The embryonic surface and follicular epithelium are closely apposed to form a follicular placenta.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

Subjects--Topical Terms:

593903
Zoology.
Index Terms--Genre/Form:

554714
Electronic books.

THE STRUCTURE, FUNCTION, AND DEVELOPMENT OF THE FOLLICULAR PLACENTA IN THE VIVIPAROUS POECILIID FISH, HETERANDRIA FORMOSA.
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245 1 4 $a THE STRUCTURE, FUNCTION, AND DEVELOPMENT OF THE FOLLICULAR PLACENTA IN THE VIVIPAROUS POECILIID FISH, HETERANDRIA FORMOSA.
264 0 $c 1985
300 $a 1 online resource (310 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 46-06, Section: B, page: 1841.
502 $a Thesis (Ph.D.)--Clemson University, 1985.
504 $a Includes bibliographical references
520 $a Embryos of the viviparous poeciliid fish, Heterandria formosa undergo a 3900% increase in dry weight during development, indicating substantial maternal-embryonic nutrient transfer. Gestation occurs within the ovarian follicle. During development, a highly vascularized pericardial sac envelops the embryonic head and has been implicated in metabolite exchange. The embryonic surface and follicular epithelium are closely apposed to form a follicular placenta.
520 $a For most of development, the entire surface epithelium of embryos is bilaminar and possesses apical microvilli, apical coated pits and vesicles, and vesicles displaying features of lysosomes. However, near the end of gestation, the epidermis differentiates and surface cells on all regions of the embryo, except the pericardial and belly sacs, lose their microvilli. Autoradiography of embryos exposed to ('3)H-glycine demonstrated that those regions of the embryonic surface possessing microvillous cells absorbed glycine. Rates of glycine and glucose absorption by embryos were age dependant with the youngest embryos displaying the greatest weight specific rates of absorption. Ultrastructural studies demonstrated that the macromolecules, iron dextran and ferritin, also were absorbed by surface, absorptive cells.
520 $a Follicle cells are characterized by apical microvilli, basal infoldings, basal endocytotic vesicles, and lysosome-like vesicles but lack secretory granules. Iron dextran and ferritn injected into females were absorbed by follicle cells and sequestered in dense-staining vesicles, but they did not enter the follicular fluid. However, electrophoretic analysis of follicular fluid polypeptides indicates that some serum polypeptides are transported across the follicular epithelium.
520 $a It is concluded from these studies that embryos are capable of absorbing macromolecules as well as low molecular weight compounds. However, transport of serum macromolecules per se across the follicular epithelium is limited and, therefore, low molecular weight compounds may be the primary nutrient source. It is speculated that follicle cells enhance utilization of serum components for embryonic nutrition by absorbing and degrading serum polypeptides and by transporting the resulting low molecular weight products to the embryo.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Zoology. $3 593903
655 7 $a Electronic books. $2 local $3 554714
690 $a 0472
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Clemson University. $3 657972
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8516375 $z click for full text (PQDT)