Results 191 to 200 of about 31,775 (244)

Motile Components in Spermatids as Related to Transport of Spermatids and Spermatozoa*

Andrologia, 2009
Two distinctly different components of motility were detected in living early spermatids of the rat using phase contrast microscopy and video-analysis: the primary flagellum (a 9 + 2 axonema) executes wave-like motion in three dimensions. At the same time the flagellum displays alternatively in clockwise and counter-clockwise directions partial torsion,
H, Walt, C, Hedinger
openaire   +2 more sources

Round spermatid injection

Fertility and Sterility, 2000
This finding has caused great concern with round spermatid enthusiasts. A major complaint is that “one should not restrict the label of round spermatid only to those cells in which an acrosomal vesicle is visible” (p. 2977) (4). However, our observation is based not only on phase-contrast evaluation of TESE microdroplets but also on detailed stained ...
Silber, Sherman, Johnson, Larry, Verheyen, Greta, Van Steirteghem, Andre   +3 more
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THE DEVELOPMENT OF THE RAT SPERMATID

Journal of the Royal Microscopical Society, 1951
SYNOPSIS.The stages of development of the rat spermatid as seen with the phase‐contrast microscope are described and illustrated. The process as thus discerned is generally consistent with previous accounts, but differs in certain particulars.The short dark rods in the Golgi apparatus of the early spermatids form a U‐shaped structure at later stages ...
C R, AUSTIN, C S, SAPSFORD
openaire   +2 more sources

MICROTUBULES IN THE SPERMATIDS OF THE DOMESTIC FOWL [PDF]

Journal of Cell Biology, 1967
Spermiogenesis in chicken has been examined in order to see whether the radical changes observed in cell shape can be related to the presence of cytoplasmic microtubules. A highly ordered array of tubules has been found which surrounds the nucleus as it elongates from a sphere to a slender cylinder.
J Richard McIntosh
exaly   +3 more sources

Spermatids as male gametes

Reproduction, Fertility and Development, 1995
Intracytoplasmic sperm injection (ICSI) is becoming increasingly popular in human infertility clinics as an efficient method for the treatment of male infertility. It is proposed that spermatids can be used as substitutes for spermatozoa if men are unable to produce sperm in their testes.
A, Ogura, R, Yanagimachi
openaire   +2 more sources

Spermatogenesis in anthozoa: Differentiation of the spermatid

Cell And Tissue Research, 1975
The fine structure of spermatids has been examined in Calliactis, Protanthea, Gonactinia and Parazoanthus (Cnidaria, Anthozoa). The sperm cells are relatively simple and lack distinct acrosomes. Their nuclei, spherical in the zoanthid, in the actinians are slendertipped cones. Condensation of the chromatin is interpreted in terms of progressive coiling
E B, Lyke, E A, Robson
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Nuclear reorganization in ram spermatids

Journal of Ultrastructure Research, 1979
Nuclear changes as a function of ram spermatid differentiation have been studied using electron microscopy, cytochemistry, and treatment of isolated nuclei with chemical and mechanical agents. In round nuclei, chromatin consists of intertwined knobby fibers about 210 and 120 A in diameter.
M, Loir, J L, Courtens
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Microtubules in the spermatid of the rabbit

Zeitschrift f�r Zellforschung und Mikroskopische Anatomie, 1969
In the cytology of the developing rabbit spermatid two systems of microtubules are conspicuous features. One corresponding to the manchette of light microscopy is in correlation with changes in the nuclear membrane giving rise to the posterior nuclear space.
openaire   +2 more sources

Myosin in early spermatids of the rat

Virchows Archiv B Cell Pathology Including Molecular Pathology, 1981
In order to obtain insight into the basic mechanism of cytoplasmic undulation in early spermatids, tubuli seminiferi of young adult rats were fixed in Stieve’s solution and examined immunohistochemically with anti-fast skeletal muscle myosin serum. A number of nuclei of spermatogonia, spermatocytes and spermatids stained intensely, but in addition the ...
H, Walt, P, Saremaslani, C W, Heizmann, C, Hedinger   +3 more
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Transformation of ram spermatid chromatin

Experimental Cell Research, 1978
Abstract In order to investigate the sequence of changes in nuclear basic proteins throughout ram spermiogenesis, we have used different techniques to obtain populations of spermatid nuclei in specific stages of maturation. Sedimentation of testis cells at 1 gravity followed by treatment with Triton X-100 resulted in one population of round spermatid
M, Loir, M, Lanneau
openaire   +2 more sources