polyspermy


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polyspermy

 [pol″e-sper´me]
fertilization of an ovum by more than one spermatozoon; occurring normally in certain species (physiologic polyspermy) but only abnormally in species such as humans (pathologic polyspermy).

pol·y·sper·my

(pol'ē-sper'mē),
The entrance of more than one sperm into the oocyte.
Synonym(s): polyspermia (1) , polyspermism

polyspermy

/poly·sper·my/ (-sper´me) fertilization of an oocyte by more than one spermatozoon; occurring normally in certain species (physiologic p.) and sometimes abnormally in others (pathologic p.) .

polyspermy

(pŏl′ē-spûr′mē)
n.
The entry of several sperm into one ovum during fertilization.

pol′y·sper′mic adj.

pol·y·sper·my

(pol'ē-spĕr'mē)
The entrance of more than one sperm into the oocyte during fertilization.
Synonym(s): polyspermia (1) , polyspermism.

polyspermy

fertilization of an ovum by more than one spermatozoon; occurring normally in certain species (physiological polyspermy) and sometimes abnormally in others (pathological polyspermy).
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References in periodicals archive ?
Fertilization in natural populations of the dioecious brown alga Fucus ceranoides and the importance of the polyspermy block.
Even if we insist that some central control is present in the hydatidiform mole--a possibility that makes more sense, perhaps, in the hydatidiform mole that suffers from polyspermy, since the presence of the maternal pronucleus allows for the possibility of the development of the body of the embryo proper--we would have to note that this controller is profoundly defective, so that the developing organism is doomed to die.
Low intracellular egg pH may prevent fertilization and subsequent development as well as slow the time that the fast block to polyspermy is established (Desrosiers et al, 1996; Kurihara, 2008; Reuter et al, 2011a).
Zona bock Biochemical changes in the oocyte that prevent more than one sperm from binding to the zona pellucida, thereby preventing polyspermy.
in press): (1) response to pathogens; (2) sexual selection by male-male competition; (3) female choice; and (4) avoidance of polyspermy (fertilization of an egg by more than one sperm).
However, such blockages apparently occur via alternative mechanisms, since the SFK antagonist PP2 promotes polyspermy (Fig.
The effects of exposing the sperm to GAGs on the rate of polyspermy and on formation of 2 pronuclei (2 PN) at 18 h after insemination was examined (Table 1).
Polyspermy resulting from high sperm density could be the cause of the abnormal development.
Meiotic arrest maintained by cAMP during the initiation of maturation enhances meiotic potential and developmental competence and reduces polyspermy of IVM/IVF porcine oocytes.