synapsis

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synapsis

 [sĭ-nap´sis]
the pairing off and union of homologous chromosomes from male and female pronuclei at the start of meiosis.

sy·nap·sis

(si-nap'sēz),
The point-for-point pairing of homologous chromosomes during the prophase of meiosis.
Synonym(s): synaptic phase
[G. a connection, junction]

synapsis

/syn·ap·sis/ (sĭ-nap´sis) the point-for-point pairing off of homologous chromosomes from male and female pronuclei during prophase of meiosis.

synapsis

(sĭ-năp′sĭs)
n. pl. synap·ses (-sēz)
The side-by-side association of homologous chromosomes during the first prophase of meiosis.

synapsis

[sinap′sis] pl. synapses
the pairing of homologous chromosomes during early meiotic prophase in gametogenesis to form double or bivalent chromosomes.

syn·apse

(sin'aps)
The functional membrane-to-membrane contact of the nerve cell with another nerve cell, an effector (muscle, gland) cell, or a sensory receptor cell. The synapse subserves the transmission of nerve impulses, commonly from a club-shaped axon terminal (the presynaptic element) to the circumscript patch of the plasma membrane of the receiving cell (the postsynaptic element) on which the synapse occurs. In most cases, the impulse is transmitted by means of a chemical transmitter substance (such as acetylcholine, gamma-aminobutyric acid, dopamine, norepinephrine) released into a synaptic cleft that separates the presynaptic from the postsynaptic membrane; the transmitter is stored in synaptic vesicles in the presynaptic element. In other synapses, transmission takes place by direct propagation of the bioelectrical potential from the presynaptic to the postsynaptic membrane.
Synonym(s): synapsis.
[syn- + G. hapto, to clasp]

synapsis

  1. the lying together of structures as in, for example, the junction of two nerve cells.
  2. (in genetics) the pairing of HOMOLOGOUS CHROMOSOMES in prophase 1 of MEIOSIS; the alignment of homologous regions of DNA prior to RECOMBINATION in prokaryotes.

synapsis

the pairing off and union of homologous chromosomes from male and female pronuclei at the start of meiosis.
References in periodicals archive ?
Through a range of experiments, they showed that when a brain cell receives signals from a neighbouring cell across a synapse, it actually releases SIRP-alpha into the space between the cells.
The entire population of synapses connected to certain groups of axons gets replaced many times during an animal's life, Svoboda and his colleagues propose.
To help confirm the role of the thrombospondins in synapse development, the scientists next developed a strain of mice that lacked the ability to produce thrombospondins 1 and 2; the brains of these mice had 40 percent fewer synapses than normal mice.
With our approach, however, we can't determine if extra professional experience actually caused new synapses to form, or if people with more synapses tended to choose challenging professions.
We have both excitatory and inhibitory synapses," Dr.
Her study focused on the visual system in rats, a convenient model for studying plasticity and how new circuits develop because retinal neurons are just one synapse away from the brain.
The adult brain stabilises the synapses so that we can use what we have learned in childhood for the rest of our lives.
11 issue of Cell, could help researchers understand diseases such as epilepsy and addiction in which too many synapses form.
Alzheimer's disease is characterized by abnormal deposits in the brain of the protein Amyloid-beta , which induces the loss of connections between neurons, called synapses.
Summary: TEHRAN (FNA)- The brain learns through changes in the strength of its synapses - the connections between neurons - in response to stimuli.
Adult female rats typically possess a comparably low number of connections, or synapses, in that area.
Our name, Synapse Capital, refers to our roots in the computer memory business, and our firm's mission to develop new synapses, or intelligent connections, with a host of leading lights in the entrepreneurial domain.