pronucleus

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pronucleus

 [pro-noo´kle-us]
the haploid nucleus of a germ cell.
female pronucleus the haploid nucleus of the fully mature oocyte, which loses its nuclear envelope and liberates its chromosomes to meet the synapsis with those from the male pronucleus.
male pronucleus the nuclear material of the head of a spermatozoon, after it has penetrated the oocyte and acquired a pronuclear membrane.

pro·nu·cle·us

, pl.

pro·nu·cle·i

(prō-nū'klē-ŭs, -klē-ī),
1. One of a pair of nuclei undergoing fusion in karyogamy.
2. In embryology, the nuclear material of the head of the sperm (male pronucleus) or of the oocyte (female pronucleus), after the oocyte has been penetrated by the sperm; each pronucleus normally carries a haploid set of chromosomes, so that the merging of the pronuclei in fertilization reestablishes diploidy.

pronucleus

/pro·nu·cle·us/ (-noo´kle-us)
1. the precursor of a nucleus.
2. the haploid nucleus occurring after meiosis in a germ cell.

pronucleus

(prō-no͞o′klē-əs, -nyo͞o′-)
n. pl. pronu·clei (-klē-ī′)
The haploid nucleus of a sperm or egg before fusion of the nuclei in fertilization.

pro·nu′cle·ar adj.

pronucleus

[-no̅o̅′klē·əs] pl. pronuclei
Etymology: Gk, pro + L, nucleus, nut kernel
the nucleus of an ovum or a spermatozoon after fertilization but before fusion of the chromosomes to form the nucleus of the zygote. Each pronucleus contains the haploid number of chromosomes, is larger than the normal nucleus, and is diffuse in appearance. The pronucleus of the ovum is formed only after it has completed its second meiotic division and the second polar body has formed, which occur after the spermatozoon has penetrated. It then loses its nuclear envelope, releasing the chromosomes so that synapsis with the chromosomes of the male pronucleus, which is contained in the head of the spermatozoon, can occur. Also called germinal nucleus, germ nucleus. See also oogenesis, spermatogenesis.

pro·nu·cle·us

, pl. pronuclei (prō-nū'klē-ŭs, -ī)
1. One of a pair of nuclei undergoing fusion in karyogamy.
2. embryology The nuclear material of the head of the sperm (male pronucleus) or of the oocyte (female pronucleus), after the oocyte has been penetrated by the sperm; each pronucleus normally carries a haploid set of chromosomes, so that the merging of the pronuclei in fertilization reestablishes the diploidy.

pronucleus

pl. pronuclei; the haploid nucleus of a sex cell.

female pronucleus
the haploid nucleus of the fully mature ovum which loses its nuclear envelope and liberates its chromosomes to meet the synapsis with those from the male pronucleus.
male pronucleus
the nuclear material of the head of a spermatozoon, after it has penetrated the ovum and acquired a pronuclear membrane.
References in periodicals archive ?
In the event of a positive outcome from the expert panel, the team at Newcastle Fertility Centre, which is part of the Newcastle Hospitals NHS Foundation Trust, will submit an application for an HFEA licence to offer pronuclear transfer to women at high risk of transmitting mitochondrial DNA disease to their children.
In non-activated oocytes, the highest female pronuclear formation rate (p<0.
This outpouring of anxiety and anger aimed at the pronuclear policies of the government along with TEPCO's incompetence and mendacity sparked expectations that the coming election would be a referendum on nuclear power.
The first method is pronuclear microinjection (which is isolated).
The new Japanese government's shift away from a nuclear energy phase-out policy on Thursday angered antinuclear groups, pleased pronuclear organizations and confused communities where nuclear plants are located.
After the nuclear disaster of Fukushima, Merkel swiftly decreed a complete renunciation of the CDU's decade-old pronuclear power policy, when she re-established the previous SDP-Green government's nuclear power phase-out plan.
Amino acids in maturation medium and presence of cumulus cells at fertilization promote male pronuclear formation in porcine oocytes matures and penetrated in vitro.
POWER black outs and energy crisis in the country are being exploited by the pronuclear lobby to push for atomic power regardless of issues related to safety, environment and cost, anti- nuclear experts have said.
Embryology: Ovulation induction protocols, media preparation, oocyte retrieval, sperm preparation, insemination, pronuclear grading, syngamy check, embryo grading Day 3 through 5 , embryo selection for Day 3 or Day 5 transfer, laser hatching, catheter loading for transfer, quality control and IVF lab setup.
Puede suceder que la gente no quiera escuchar o se niegue a saber (un caso elocuente: las denuncias sobre catastrofes nucleares en la URSS ventiladas a finales de los anos '50 por refugiados sovieticos nunca fueron tomadas en serio en occidente porque la mentalidad pronuclear de la epoca no queria aceptar que tales desastres pudieran ocurrir); o que la revelacion no haga mella en sus creencias (vease el nulo impacto de muchas informaciones sobre corrupcion en el exito electoral de los candidatos imputados).
Pronuclear incumbent wins in Hokkaido mayoral election