cytogenesis
细胞发生
细胞发生
cytogenesis n 1 :
the origin and development and variation of cells [
synonym :
{
cytogenesis }, {
cytogeny }]
Cytogenesis \
Cy `
to *
gen "
e *
sis \ (
s ?`
t ?-
j ?
n "?-
s ?
s ),
n . [
Gr .
ky `
tos hollow vessel E .
genesis .] (
Biol .)
Development of cells in animal and vegetable organisms .
See {
Gemmation }, {
Budding }, {
Karyokinesis };
also {
Cell development },
under {
Cell }.
[
1913 Webster ]
Cytogenic
Cell \
Cell \,
n . [
OF .
celle ,
fr .
L .
cella ;
akin to celare to hide ,
and E .
hell ,
helm ,
conceal .
Cf . {
Hall }.]
1 .
A very small and close apartment ,
as in a prison or in a monastery or convent ;
the hut of a hermit .
[
1913 Webster ]
The heroic confessor in his cell . --
Macaulay .
[
1913 Webster ]
2 .
A small religious house attached to a monastery or convent . "
Cells or dependent priories ." --
Milman .
[
1913 Webster ]
3 .
Any small cavity ,
or hollow place .
[
1913 Webster ]
4 . (
Arch .)
(
a )
The space between the ribs of a vaulted roof .
(
b )
Same as {
Cella }.
[
1913 Webster ]
5 . (
Elec .)
A jar of vessel ,
or a division of a compound vessel ,
for holding the exciting fluid of a battery .
[
1913 Webster ]
6 . (
Biol .)
One of the minute elementary structures ,
of which the greater part of the various tissues and organs of animals and plants are composed .
[
1913 Webster ]
Note :
All cells have their origin in the primary cell from which the organism was developed .
In the lowest animal and vegetable forms ,
one single cell constitutes the complete individual ,
such being called unicelluter orgamisms .
A typical cell is composed of a semifluid mass of protoplasm ,
more or less granular ,
generally containing in its center a nucleus which in turn frequently contains one or more nucleoli ,
the whole being surrounded by a thin membrane ,
the cell wall .
In some cells ,
as in those of blood ,
in the am [
oe ]
ba ,
and in embryonic cells (
both vegetable and animal ),
there is no restricting cell wall ,
while in some of the unicelluliar organisms the nucleus is wholly wanting .
See Illust .
of {
Bipolar }.
[
1913 Webster ]
{
Air cell }.
See {
Air cell }.
{
Cell development } (
called also {
cell genesis }, {
cell formation },
and {
cytogenesis }),
the multiplication ,
of cells by a process of reproduction under the following common forms ;
segmentation or fission ,
gemmation or budding ,
karyokinesis ,
and endogenous multiplication .
See {
Segmentation }, {
Gemmation },
etc .
{
Cell theory }. (
Biol .)
See {
Cellular theory },
under {
Cellular }.
[
1913 Webster ]
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