Search results for "Vitelline membrane"

showing 3 items of 3 documents

Effects of tributyltin(IV) chloride on fertilization of Styela plicata (Ascidiacea: Tunicata): II. Scanning and transmission electron microscopy stud…

2003

The morphological aspects of Styela plicata fertilization after treatment with tributyltin(IV) chloride are described by means of scanning and transmission electron microscopy investigations. Alterations have been shown both on female and male gametes; spermatozoa, all the egg envelopes and the mitochondria of the egg cortical cytoplasm are modified in relation to incubation time. As a consequence, the damage to gametes blocks sperm-egg interaction and fertilization does not occur. Copyright © 2003 John Wiley & Sons, Ltd.

Ascidiangameteanimal cellstyela plicataincubation timespermspecieanimal tissueInorganic Chemistrymalemorphologytransmission electron microscopytributyltin chloridemitochondrioncontrolled studyoocytevitelline membranenonhumanarticleoocyte cortexfemalespermatozoonTributyltin(IV) chlorideChemistry (miscellaneous)fertilizationSettore CHIM/03 - Chimica Generale E Inorganicacytoplasmovary follicle cellscanning electron microscopyAscidiacea
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Effects of tributyltin(IV) chloride on the gametes and fertilization ofAscidia malaca (Ascidiacea: Tunicata)

2003

Ascidia malaca gametes before fertilization incubated in 10-5 or 10-7 M solutions of tributyltin(IV) chloride, TBTCl, for 3 h appear highly damaged under transmission electron microscopy observation. Also, the fertilization process is affected by the compound: the damaged spermatozoa are present in the vitelline coat and the egg does not cleave. An increase of microbodies, structurally similar to peroxisomes, have been detected in the egg peripheral cytoplasm, probably in relation to their role in alleviating damage to some cellular components. The results have shown that the reproduction of ascidians under unfavourable environmental conditions is prevented. Copyright © 2003 John Wiley &amp…

Ascidianmedia_common.quotation_subjectgameteanimal cellChloridereproductionInorganic Chemistrychemistry.chemical_compoundGametes and reproductionHuman fertilizationenvironmental factortransmission electron microscopymedicinetributyltin chlorideMicrobodycontrolled studyperoxisomevitelline membranemedia_commonAscidiaceanonhumanbiologyChemistryPeroxisomes proliferationarticleGeneral Chemistrybiology.organism_classificationCell biologycell damagemicrobodyAscidiamedicine.anatomical_structurespermatozoonTributyltin(IV) chlorideChemistry (miscellaneous)fertilizationSettore CHIM/03 - Chimica Generale E InorganicacytoplasmTributyltinGameteoocyte cleavageReproductionAscidiaceacell structuremedicine.drugApplied Organometallic Chemistry
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Long-lasting exocytosis and massive structural reorganisation in the egg periphery during cortical reaction inPlatynereis dumerilii(Annelida, Polycha…

1995

SummaryThe course of the cortical reaction in thePlatynereis dumeriliiegg is described from live observation and from sectioned fixed material and is found to differ in several aspects from the course of cortical reactions in better-known systems. Cortical granules are unusually numerous. They are discharged by exocytosis during a period of about 25 min following fertilisation (18°C). Most of the surplus membrane material brought to the egg surface by exocytosis is set free into the perivitelline space. Swelling of egg jelly precursor secreted by cortical granule exocytosis may be causal for the detachment of the vitelline envelope from the egg cell surface which, however, remains attached …

Egg cellCytochalasin DVitelline membranePerivitelline spaceExocytosismedicineAnimalsCytoskeletonCell SizeOvumMicrovillibiologyChemistryCortical granule exocytosisNocodazoleCell MembranePolychaetaCell Biologybiology.organism_classificationOocyteCell biologyMicroscopy Electronmedicine.anatomical_structureMicroscopy FluorescenceFertilizationCortical reactionEgg jellyDevelopmental BiologyPlatynereisZygote
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