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  • 1
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    Changes in distribution of basic nuclear proteins and chromatin organization during spermiogenesis in the greater bandicoot rat, Bandicota indica (2008)
    Springer
    Details
    Publication Date: 2008-08-23
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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    PAPER CURRENT
  • 2
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    The marsupial shell membrane: an ultrastructural and immunogold localization study (1996)
    Springer
    Details
    Publication Date: 1996-03-22
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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  • 3
    Electronic Resource
    Electronic Resource
    The marsupial shell membrane: an ultrastructural and immunogold localization study (1996)
    Springer
    Cell & tissue research 284 (1996), S. 99-110 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Shell membrane ; Mucoid coat ; Utero-tubal junction ; Sminthopsis crassicaudata (Marsupialia)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. In the dasyurid marsupial, Sminthopsis crassicaudata, as the oocytes/embryos travel down the female reproductive tract two extracellular coats, the mucoid and shell membrane, come to surround them. Embryos recovered from the oviduct have a mucoid coat but no shell membrane which is only found surrounding uterine embryos. Initially, the shell membrane has a compact granular consistency but it later thins and becomes fibrous in texture with fibres oriented mainly in the plane of the membrane. Immunogold labelling with polyclonal antibodies raised against the extracellular coats was employed to determine the location and ultrastructural appearance of the secretory granules which contain mucoid and shell membrane precursors. Secretory granules in the luminal epithelium of the ampulla of the oviduct are of irregular electron density, while those in the isthmus are electron-dense and homogeneous. Both types give rise to the mucoid coat. Secretory granules in the epithelia of the utero-tubal junction and some endometrial glands are electron-lucent and contain some flocculent material which, after exocytosis, gives rise to the shell membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410050570
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  • 4
    Electronic Resource
    Electronic Resource
    Formation of the ventral hooks on the sperm head of the plains mouse, Pseudomys australis (1987)
    New York, NY : Wiley-Blackwell
    Gamete Research 17 (1987), S. 115-129 
    Details
    ISSN: 0148-7280
    Keywords: spermiogenesis ; actin ; perinuclear material ; postacrosomal region ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The sperm head of the plains mouse, Pseudomys australis, has three curved hooks projecting from its anterior margin. The two ventral hooks have previously been shown to consist largely of an extension of the subacrosomal material. To characterize further the structure and composition of the ventral hooks, we have examined their formation during spermiogenesis using transmission electron microscopy, silver staining, and actin localization with NBD-phallacidin. The ventral hooks develop as an extension of the perinuclear space and postacrosomal dense lamina on the anteroventral margin of the sperm head. Bundles of 6-nm-thick filaments appear in the core of each hook; these are probably actin filaments based on staining of the hooks with NBD-phallacidin. Just prior to spermiation, electron-dense material condenses in the core of the ventral hooks and concurrently in the perinuclear space in the remainder of the sperm head. The two ventral hooks thus appear to consist of a core of perinuclear material and actin filaments, which is enclosed by a continuation of the postacrosomal dense lamina.
    Additional Material: 23 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120170204
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  • 5
    Electronic Resource
    Electronic Resource
    The sperm head of the plains mouse, Pseudomys australis: Ultrastructure and effects of chemical treatments (1983)
    New York, NY : Wiley-Blackwell
    Gamete Research 8 (1983), S. 231-244 
    Details
    ISSN: 0148-7280
    Keywords: plains mouse ; sperm head ; hooks ; ultrastructure ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The ultrastructure of the sperm head of the plains mouse, Pseudomys australis, and the effects of chemical treatments on the sperm head components has been investigated to determine the nature of the material in the hooks on the apical margine of the sperm head. Ultrastructural studies indicated that the dorsal hook contained nuclear, subacrosomal, and acrosomal material, whereas the two ventral hooks were largely composed of an extention of the subacrosomal material with two thin acrosomal projections at their base. Acrosomal material was dispersed by mild detergent treatment, where as the bulk of the material in the ventral hooks were generally found to be similar to the subacrosomal material in the dorsal hook in their resistance to the various chemical treatments. Treatment of sperm with NaOH or guanidine-hydrochloride and DTT revealed two layers of material in the ventral hooks.
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120080304
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  • 6
    Electronic Resource
    Electronic Resource
    Structure of the zona pellucida and cumulus oophorus in three species of native Australian rodents (1989)
    New York, NY : Wiley-Blackwell
    Gamete Research 23 (1989), S. 279-287 
    Details
    ISSN: 0148-7280
    Keywords: oocyte ; sperm head ; zona pellucida ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The sperm head of many Australian hydromyine rodents has three curved hooks projecting from its anterior margin; the structure of the hooks has been characterized, but their function is unknown. In this study, we have investigated whether the hooks might have evolved to assist sperm penetration through more formidable egg vestments, particularly the zona pellucida. Cumulus-oocyte complexes were obtained from two species that possess a three-hooked sperm head (Pseudomys australis and P. nanus) and one species that does not (Notomys alexis) and examined by light and electron microscopy. After fixation in the presence of ruthenium red, the zona pellucida was found to consist of a fibrillar meshwork, but there were no interspecific structural differences. A corona radiata was absent, and the cumulus extracellular matrix was composed of filaments and electron-dense granules in each species. Measurements of the zona thickness in freshly ovulated, unfixed oocytes revealed that it was thinnest (7.8 μm) in P. australis. Which has a three-hooked sperm head, and thickest (11.4 μm) in N. alexis, the species in which the ventral hooks are absent. Hence, no correlation was found between the thickness of the zona pellucida or the structure of the cumulus-oocyte complex, and the presence of three hooks on the sperm head. We conclude, therefore, that it is unlikely that the evolution of the three-hooked sperm head is an adaptation for penetration of increased barriers around the oocyte.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120230305
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