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The nucleus of a cell; the germinal or active spot of a cellule, through or in which cell development takes place.

The nucleus of the cytula or parent cell. Hæckel.

bstance of the body of a cell, as distinguished from the karyoplasma, or substance of the nucleus. -- Cy`to*plas"mic (-pl, a.

A double star; -- applied to the nucleus of a cell, when, during cell division, the loops of the nuclear network separate into two groups, preparatory to the formation of two daughter nuclei. See Karyokinesis.

which new cells are formed by the division of the parent cell. In this process, the cell nucleus undergoes peculiar differentiations and changes, as shown in the figure (see also Karyokinesis). At the same time the protoplasm of the cell becomes gradually constricted by a furrow transverse to the long axis of the nucl…

The basal substance of the cell nucleus; a hyaline or granular substance, more or less fluid during life, in which the other parts of the nucleus are imbedded.

Entoblast; endoplast. See Nucleus,

multiplication (Biol.), a method of cell formation, seen in cells having a cell wall. The nucleus and protoplasm divide into two distinct masses; these in turn become divided and subdivided, each division becoming a new cell, until finally the original cell wall is ruptured and the new cells are liberated (see Segmenta…

See Nucleus.

A group of Rhizopoda having a distinct nucleus, as the am

ucts of some Protozoa, or the entoplastic modification of the cell protoplasm, by which a nucleus is produced.

The nebulous covering of the head or nucleus of a comet; -- called also coma.

-- Germinal spot (Biol.), the nucleolus of the ovum. -- Germinal vesicle, (Biol.) , the nucleus of the ovum of animals.

in the earthworm, lobster, etc. When adult, they have a small, wormlike body inclosing a nucleus, but without external organs; in one of the young stages, they are amoebiform; -- called also Gregarinida, and Gregarinaria.

(Biol.) A cytode without a proper cell wall, but with a nucleus. Haeckel.

A cytode without either a cell wall or a nucleus. Haeckel.

A complex, nitrogenous radical, C8H5NO, regarded as the essential nucleus of indigo.

Any one of the derivatives of indogen, which contain that group as a nucleus.

Within the nucleus of a cell; as. the intranuclear network of fibrils, seen in the first stages of karyokinesis.

A soldier of a privileged military class, which formed the nucleus of the Turkish infantry, but was suppressed in 1826. [written also janissary.]