(n.) A genus of echinoderms, including the common edible sea urchin of Europe.
(n.) The rounded molding forming the bell of the capital of the Grecian Doric style, which is of a peculiar elastic curve. See Entablature.
(n.) The quarter-round molding (ovolo) of the Roman Doric style. See Illust. of Column
(n.) A name sometimes given to the egg and anchor or egg and dart molding, because that ornament is often identified with Roman Doric capital. The name probably alludes to the shape of the shell of the sea urchin.
Example Sentences:
(1) The valve ossicle resembles that of Parechinus in its triangular valve shape and open blade form, contrasting with Echinus in these features.
(2) In contrast to these gene families, sequences complementary to an internally repetitious Echinus DNA clone were found primarily in the methylated DNA compartment.
(3) The account of the life history of P. echinus is emended accordingly and differences in structure and behavior between that species and P. pseudoechinus are described.
(4) Doublet microtubules were prepared from sea-urchin (Echinus esculentus and Stronglyocentrotus droebachiensis) and scallop (Pecten maximus) sperm by dialysing flagellar axonemes against 2 mM Tris-0-2 mM EDTA-0-5 mM DTT.
(5) DNA synthesis in Echinus esculentus eggs kept at 10 degrees C takes place just after fusion, 0.75-1.5h after fertilization, and at telophase at about 2.67-3.33h after fertilization.
(6) A screen of rough eye mutants identifies two genes, roughest and echinus, required for the normal elimination of cells from the retinal epithelium.
(7) Sea urchin (Echinus esculentus) DNA has been separated into high and low molecular weight fractions by digestion with the mCpG-sensitive restriction endonucleases Hpa II, Hha I and Ava I.
(8) The ultrastructure of the gills of Echinus esculentus is described using transmission electron microscopy.
(9) Experiments indicate that eggs and embryos of the North Sea sea urchin Echinus esculentus are excellent material to investigate the regulation of protein synthesis before and after fertilization.
(10) Nuclei were isolated from Echinus eggs through the first cleavage cycle by modification of existing techniques.
(11) The frequency of mutations at the different loci encompassed a wide range: while no mutations were recovered at the raspberry and carnation loci, at others, the numbers ranged from 1 at echinus to 31 at garnet; in addition, the proportion of mutations that was male-viable was also different, depending on the locus.
(12) Using cloned Echinus histone DNA, heterologous 5S DNA and ribosomal DNA probes, we have found that each of these gene families belongs to the unmethylated DNA compartment in all the tissues examined.
(13) The proportion of thiol groups in the total thiol+disulphide of histone extracts from fertilized eggs from Echinus and Psammechinus was increased during periods of structural alterations in the nucleus.
(14) The morphology of cells incorporating modified cilia in the epithelium of the spines, tube-feet and general surface of the ophiuroid echinoderm Ophiura ophiura are described using transmission and scanning electron microscopy and compared to those on the tube-feet of the echinoid Echinus esculentus.
(15) Although 2 species found in Echinus esculentus have been referred to S. echinorum by previous workers, neither is conspecific with it.
(16) An analysis of the ultrastructure of the tube feet of three species of sea urchins (Strongylocentrotus franciscanus, Arbacia lixula and Echinus esculentus) revealed that the smooth muscle, although known to be cholinoceptive, receives no motor innervation.
(17) A total of 85 isolates of mesophilic, aerobic, heterotrophic bacteria were isolated from the gut, peristomial membrane, and coelomic fluid from specimens of the sea urchin Echinus esculentus from the Clyde Sea area of Scotland.
(18) The 4-demethyl sterols of Echinus esculentus consisted of cholesterol as the major component, with lower concentrations of nine other C(26), C(27), C(28) and C(29) Delta(5) sterols.
(19) Life history studies reveal that developmental stages previously reported for P. echinus from gars belong instead to the new species.
Ovolo
Definition:
(n.) A round, convex molding. See Illust. of Column.