«GEMMULE»に関連する英語の本
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1
Stem Cells: From Hydra to Man
2.7.2. Gemmule. Formation. Some species of sponge, including the freshwater
sponge E. fluviatilis, used in our studies, have both sexual and asexual
reproduction systems (Fig. 2.2). Asexual reproduction in the sponge begins with
the ...
Gametogenesis in all cases followed rapidly on gemmule hatching. While it is
only theorizing to guess at the significance of this behaviour, it is possible to see
advantages for a sessile organism which disperses by free larvae. An isolated
larva ...
Patricia R. Bergquist,
1978
3
The Masterpiece of Nature: The Evolution and Genetics of ...
Small calcareous sponges living in the littoral and intertidal. Gemmule formation
is unknown but budding is common, and vegetative fragmentation may be a
regular mode of reproduction in some species. HEXACTINELL1DA (
Hyalospongiae).
4
Aquatic Invertebrates of Alberta: An Illustrated Guide
The other method is gemmule formation. Gemmules are small "seed-like"
structures usually about a half a millimeter in diameter (see porifera pictorial key).
They form when undifferentiated amoebocytes stream together and clump
together.
5
Progress in Invertebrate Zoology
at the base of the pore tube, the wall of which is continuous with the gemmule
shell. The pore tube is closed at the distal end by another thin membrane. The
more proximal micropyle membrane is formed by modified spongioblasts (
micropylar ...
6
A history of the vegetable kingdom
mode of germination. In the dicotyledonous embryo, the radicle is generally
conical and protuberant; the caulicle is cylindrical; and the gemmule is naked
and concealed between the bases of the two cotyledons, which are placed face
to face, ...
7
CURRENT TOPICS DEVELOPMENTAL BIOLOGY
the archaeocytes of the gemmule are generally referred to as thesocytes. The
number of cells in one gemmule ranges from several hundreds to several
thousands. C. HATCHING OF THE GE-MMULE In the resting gemmule, the two
nuclei of ...
A. A. Moscona, Alberto Monroy,
1976
The whole of the portion situated above the gemmule is the cotyledon (fig. 260, c)
. With strict attention, on examining with a lens of sufficient power the fresh or
moistened embryo, it is possible to determine these different regions, even
without ...
Adrien de Jussieu, James Hewetson Wilson,
1849
9
On Evolution: The Development of the Theory of Natural Selection
... basic laws of inheritance: (1) like produces like (gemmule replication and
elective affinity), (2) like produces novelty (gemmule variation), and (3)
grandchildren can revert to grandparents (gemmule dormancy). This boils
Introduction 217.
Charles Darwin, Thomas F. Glick, David Kohn,
1996
10
Pennak's Freshwater Invertebrates of the United States: ...
Scanning electron micrograph of a gemmule of Corvomeyenia everetti showing
embedded gemmoscleres and a few attached mega- scleres. Formerly it was
thought that gemmules appeared only at the close of the growing season, but it is
...
Douglas Grant Smith,
2001
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Bioblitz Turns Up Ancient Find in the Presidio
Technically, it was not an entire sponge but a sponge gemmule, an inactive phase that only evolved in the freshwater descendants of marine ... «Bay Nature, 7月 14»
BioBlitz Identifies More than 80 Species New to Golden Gate Parks
This discovery clearly indicates that this area has been a watershed for thousands of years as this gemmule—or desiccated version of a ... «National Geographic, 3月 14»
No, Scientists in Darwin's Day Did Not Grasp the Complexity of the …
But what about Darwin's citation of the gemmule? Does this help show ... A gemmule is, of course, a now-discredited concept. Darwin had an ... «Discovery Institute, 6月 13»
Soccer Science: Bunkering In
Our defensive backline, along with the ever-ready Hall, forms our protective shell in tough times, much like the Gemmule formed by sponge ... «Dynamo Theory, 3月 12»