scholarly journals Process of Oogenesis in Proechinocephalus Egreti (A Digenetic Trematode) Shrivastava, 1960

2016 ◽  
Vol 3 (3) ◽  
Author(s):  
Rajani Gautam
Keyword(s):  
Reproductive Organs ◽  
Digenetic Trematode ◽  
Cover Glass ◽  
Cattle Egret ◽  
Bubulcus Ibis ◽  
The Family ◽  
Indian Cattle ◽  
Whole Mounts ◽  
Female Reproductive Organs

<div><p>         <em>Present paper deals with the study of process of oogenesis of a digenetic trematode Proechinocephalus egreti (a digenetic trematode) of the family Echinostomatidae was collected from the intestine of an Indian cattle egret, Bubulcus ibis coromandus. A few of parasites were flattened on a clean slide under the slight pressure of a cover glass &amp; fixed in Alcoholic Bouin,s fluid for 12 hours. Stains like Gover’s Carmine, Mayer’s Para carmine &amp; Haemalum were  used for the preparation of whole mounts for identification &amp; the study of female reproductive organs &amp; the process of oogenesis in Proechinocephalus egreti.  </em></p></div>

Ultrastructure of the female reproductive organs (ovary, vitellaria, and Mehlis' gland) of Halipegus eccentricus (Trematoda: Derogenidae)

1986 ◽  
Vol 64 (10) ◽  
pp. 2203-2212 ◽  
Author(s):  
Jon M. Holy ◽  
Darwin D. Wittrock
Keyword(s):  
Cell Types ◽  
Reproductive Organs ◽  
Golgi Body ◽  
Digenetic Trematode ◽  
Secretory Cells ◽  
Cortical Granules ◽  
Golgi Bodies ◽  
Transmission Electron ◽  
Vitelline Cells ◽  
Female Reproductive Organs

The female reproductive organs (ovary, vitellaria, and Mehlis' gland) of the digenetic trematode Halipegus eccentricus were studied by transmission electron microscopy. Oocytes entered diplotene while in the ovary and produced cortical granules and lipid bodies. Vitelline cells produced large amounts of eggshell protein but no yolk bodies. Two types of Mehlis' gland secretory cells were present, distinguishable by the morphology of their rough endoplasmic reticulum, Golgi bodies, and secretory bodies, and by the persistence of recognizable secretory material within the ootype lumen after exocytosis. In an attempt to standardize the nomenclature regarding the cell types of the Mehlis' gland, a classification that takes into account these four criteria is proposed. Two basic types of Golgi body organization were noted for the cells of the female reproductive system: a stack of flattened cisternae (Mehlis' gland alpha cells) and spherical Golgi bodies with vesicular cisternae (oocytes, vitelline cells, and Mehlis' gland beta cells).

scholarly journals A systematic classification of Ephedraceae: living and fossil

Phytotaxa ◽  
2014 ◽  
Vol 158 (3) ◽  
pp. 283 ◽  
Author(s):  
Yong Yang
Keyword(s):  
Early Cretaceous ◽  
Reproductive Organs ◽  
New Classification ◽  
Generic Level ◽  
Systematic Classification ◽  
Evolutionary Hypothesis ◽  
The Family ◽  
Female Reproductive Organs

A number of Ephedroid macrofossils have been described from the Early Cretaceous in the last decade, indicating huge diversity of early Ephedraceae. However, relationships among these fossils and modern Ephedra remain ambiguous. This study proposes a new systematic classification of the family at the generic level based on the reduction and sterilization evolutionary hypothesis of female reproductive organs. Two subfamilies and two tribes are described as new to science. In this new classification, the family Ephedraceae consists of two subfamilies: Siphonospermoideae Y. Yang subfam. nov. and Ephedroideae Y. Yang subfam. nov., and the latter subfamily is divided again into two tribes: Liaoxieae Y. Yang trib. nov. and Ephedreae Y. Yang trib. nov. Ten genera are included in the new classification, and two genera are listed as doubtful due to their taxonomic characters being insufficient to place them in Ephedraceae. 

scholarly journals Molecular, morphological, and biogeographic perspectives on the classification of Acrobolboideae (Acrobolbaceae, Marchantiophyta)

Phytotaxa ◽  
2017 ◽  
Vol 319 (1) ◽  
pp. 56 ◽  
Author(s):  
LAURA R. E. BRISCOE ◽  
NYREE J. C. ZEREGA ◽  
H. THORSTEN LUMBSCH ◽  
MICHAEL STECH ◽  
EKAPHAN KRAICHAK ◽  
...  
Keyword(s):  
Phylogenetic Relationships ◽  
Morphological Characters ◽  
Reproductive Organs ◽  
The Family ◽  
Evolutionary Trajectories ◽  
Single Genus ◽  
Male Reproductive Organs ◽  
Lines Of Evidence ◽  
Female Reproductive Organs

The liverwort subfamily Acrobolboideae has historically contained the three genera: Acrobolbus, Marspidium, and Tylimanthus. Generic delimitations in this subfamily have been historically inferred from morphological characters, specifically the location of gametangia. Taxonomists have had difficulty separating the genera, with some combining Tylimanthus and Acrobolbus, whereas others merged Marsupidium and Tylimanthus. We used five chloroplast loci to reconstruct a phylogeny of the group, revealing all three genera are polyphyletic as currently described. An assessment of key morphological characters used to separate genera in the subfamily resulted in several observations: characters used to circumscribe Acrobolbus were homoplasious; characters used to circumscribe each genus (e.g., the placement of female reproductive organs) do not reflect phylogenetic relationships; and the evolutionary trajectories of some characters (i.e., the number of antheridia, male reproductive organs, per male bract) correspond directly with previous evolutionary hypotheses for the family, but do not follow historical taxonomic inferences. Irrespective of generic concepts, several well–supported clades within the phylogeny have a strong biogeographic structure. Using these lines of evidence, we recognize Acrobolbus as a single genus in Acrobolboideae.

Ultrastructural aspects of gymnosperms reproductive organs tissues due to their functional condition

1978 ◽  
Vol 36 (2) ◽  
pp. 440-441
Author(s):  
G. M. Kozubov
Keyword(s):  
Metabolic Activity ◽  
Functional Condition ◽  
Reproductive Organs ◽  
Considerable Change ◽  
Complicated Structure ◽  
Tetrad Stage ◽  
Ubisch Bodies ◽  
Similar Organization ◽  
Female Reproductive Organs ◽  
High Metabolic Activity

The ultrastructure of reproductive organs of pine, spruce, larch and ginkgo was investigated. It was found that the male reproductive organs possess similar organization. The most considerable change in the ultrastructure of the microsporocytes occur in meiosis. Sporoderm is being laid at the late tetrad stage. The cells of the male gameto-phyte are distinguished according to the metabolic activity of the or- ganells. They are most weakly developed in the spermiogenic cell. Ta-petum of the gymnosperms is of the periplasmodic - secretorial type. The Ubisch bodies which possess similar structure in the types investigated but are specific in details in different species are produced in tapetum.Parietal and subepidermal layers are distinguished for their high metabolic activity and are capable of the autonomous photosynthesis. Female reproductive organs differ more greatly in their struture and have the most complicated structure in primitive groups. On the first stages of their formation the inner cells of nucellus are transformed into the nucellar tapetum in which the structures similar to the Ubisch bodies taking part in the formation of the sporoderm of female gametophyte have been found.

Cattle Egret (Bubulcus ibis)

2019 ◽  
Author(s):  
Raymond C. Telfair II
Keyword(s):  
Cattle Egret ◽  
Bubulcus Ibis

Medical Metaphors of Women's Bodies: Menstruation and Menopause

1988 ◽  
Vol 18 (2) ◽  
pp. 237-254 ◽  
Author(s):  
Emily Martin
Keyword(s):  
19Th Century ◽  
Reproductive Organs ◽  
Central Control ◽  
Centralized Control ◽  
Medical Texts ◽  
Women's Bodies ◽  
Waste Products ◽  
Bureaucratic Organization ◽  
Medical Metaphors ◽  
Female Reproductive Organs

Implicit, underlying imagery in medical descriptions of menstruation and menopause is exposed, beginning with 19th century views. Contemporary medical texts and teaching reveal two fundamental assumptions about women's bodies. First, they assume that female reproductive organs are organized as if they form a hierarchical, bureaucratic organization under centralized control. Given this assumption, menopause comes to be described negatively, as a process involving breakdown of central control. Second, they assume that women's bodies are predominantly for the purpose of production of desirable substances, primarily babies. Given this assumption, menstruation comes to be seen negatively, as a process involving failed production, waste products, and debris. Alternative imagery that works from our current understanding of physiology, but avoids denigration of women's bodies, is suggested.

Effects of Growth Hormone on Female Reproductive Organs

2001 ◽  
Vol 30 (5) ◽  
pp. 265-271 ◽  
Author(s):  
G. G. Kaiser ◽  
F. Sinowatz ◽  
G. A. Palma
Keyword(s):  
Growth Hormone ◽  
Reproductive Organs ◽  
Female Reproductive Organs

On the Anatomy of the Trematode Petasiger exaeretus Dietz 1909, from the Intestine of Phalacrocorax Carbo

Parasitology ◽  
1934 ◽  
Vol 26 (1) ◽  
pp. 133-137 ◽  
Author(s):  
Evan Davies
Keyword(s):  
Small Intestine ◽  
Type Species ◽  
Detailed Account ◽  
Serial Sections ◽  
Phalacrocorax Carbo ◽  
The Family ◽  
Whole Mounts

The genus Petasiger which belongs to the family Echinostomidae was proposed by Dietz in 1909, with Petasiger exaeretus as the type species. The description given by Dietz of this species is incomplete and it is proposed therefore to present below a more detailed account of the anatomy, based on an examination of whole mounts and serial sections. The material was obtained from the small intestine of cormorants shot on the coast of Cardigan Bay between Aberystwyth and Llanrhystyd. Five cormorants were shot in July, and of these two contained a large number of Petasiger exaeretus in the small intestine.

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