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The axoneme: the propulsive engine of spermatozoa and cilia and associated ciliopathies leading to infertility
(Springer, 2016-02)
This review article provides a critical analysis of the structure and molecular mechanisms of the microtubule axoneme of cilia and sperm flagella and their associated elements required for male fertility. A broad range of ...
Phenotypic varieties of sperm pathology: Genetic abnormalities or environmental influences can result in different patterns of abnormal spermatozoa
(Elsevier Science, 2018-07)
The present paper reviews in detail ultrastructural and molecular studies addressed to characterize different phenotypes of sperm pathology in sterile men. In each case ultrastructural, immunocytochemical, molecular and ...
The making of abnormal spermatozoa: Cellular and molecular mechanisms underlying pathological spermiogenesis
(Springer, 2010-09)
Fertilization in mammals occurs via a series of well-defined events in the secluded environment of the female reproductive tract. The mode of selection of the fertilizing spermatozoon nevertheless remains unknown. As has ...
Collenchyma in Panicum maximum (Poaceae): localisation and possible role
(CSIRO Publishing, 2003-01-01)
This work relates the occurrence and distribution of collenchyma in Panicum maximum Jacq. P. maximum leaves were collected at different phases of development and sampled from both the base of the sheath and from the ...
Collenchyma in Panicum maximum (Poaceae): localisation and possible role
(CSIRO Publishing, 2003-01-01)
This work relates the occurrence and distribution of collenchyma in Panicum maximum Jacq. P. maximum leaves were collected at different phases of development and sampled from both the base of the sheath and from the ...
Collenchyma in Panicum maximum (Poaceae): localisation and possible role
(CSIRO Publishing, 2014)
Sin título
(1982-01-01)
Mesoscopic observations on the hypoglossal nerve at the level of the superior portion of the hypoglossal canal, show that this nerve is separated by bundles, which are attached to the wall of the venous plexus of the ...
Morphology of the atrioventricular junction in Iguana iguana (Reptilia-Iguanidae)Morfologia da junção atrioventricular em Iguana iguana (Reptilia-Iguanidae)
(2006-01-01)
The atrioventricular junctional area (AVJA), including atrioventricular (AV) node and bundle was investigated in seven hearts of common or green iguana (Iguana iguana) using the light microscopy. Adult animals, both sexes, ...
Ultrastructure of the Spermatozoa of the Domestic Duck (Anas platyrhynchos sp.)
(Wiley-Blackwell, 2012-06-01)
The ultrastructure of the spermatozoa of the domestic duck (Anas platyrhynchos sp.) was analysed by transmission and scanning electron microscopies and compared with the results obtained in preliminary studies involving ...
Electron microscopy study of lizard spermiogenesis in Tropidurus torquatus (Lacertilia)
(1977-12-01)
In the course of an investigation on lizard spermiogenesis, the authors have observed events connected with the differentiation of the acrosome and middle-piece of the spermatozoa. Some differences from other reptilians ...