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Those animals in which the protoplasmic mass, constituting the egg, is converted into a multitude of cells, which are metamorphosed into the tissues of the body. A central cavity is commonly developed, and the cells around it are at first arranged in two layers, -- the ectoderm and endoderm. The group comprises nearly…

A theoretical aggregation of molecules constituting a structural particle of protoplasm, capable of increase or diminution without change in chemical nature.

The denser part of the protoplasm of a cell.

ving the form of a monad; resembling a monad in having one or more filaments of vibratile protoplasm; as, monadiform young.

in that stage of development in which its form is simply that of a non-nucleated mass of protoplasm. It precedes the one- celled germ. So called from its likeness to a moner. Haeckel.

in; resembling mucin. The mucigenous basis is manufactured at the expense of the ordinary protoplasm of the cell. Foster.

The protoplasmic matter of which bacteria are composed.

A substance, present in the protoplasm of the retinal epithelium cells, and resembling, if not identical with, the substance (myelin) forming the medullary sheaths of nerve fibers.

hey are found on damp earth and decaying vegetable matter, and consist of naked masses of protoplasm, often of considerable size, which creep very slowly over the surface and ingest solid food. -- Myx`o*my*ce"tous (#), a.

The matter composing the nucleus of a cell; the protoplasm of the nucleus; karyoplasma.

A body, usually spheroidal, in a cell or a protozoan, distinguished from the surrounding protoplasm by a difference in refrangibility and in behavior towards chemical reagents. It is more or less protoplasmic, and consists of a clear fluid (achromatin) through which extends a network of fibers (chromatin) in which may…

An unfertilized, rounded mass of protoplasm, produced in an oögonium.

One of the protoplasmic cells which occur in the osteogenetic layer of the periosteum, and from or around which the matrix of the bone is developed; an osteoplast.

A more or less spherical and transparent mass of granular protoplasm, which by a process of multiplication and growth develops into a mass of cells, constituting a new individual like the parent; an egg, spore, germ, or germ cell. See Illust. of Mycropyle.

The fluid portion of the protoplasm of a cell.

also for the cultivation of bacteria and other organisms. It contains all the elements of protoplasm, and was originally made of the ash of yeast, some ammonia compound, sugar, and water.

The protoplasmic matter which surrounds the entoblast, or cell nucleus, and undergoes segmentation. -- Per`i*blas"tic, a.

Of or pertaining to a nucleus; situated around a nucleus; as, the perinuclear protoplasm.

ungi, the algal or algalike fungi. The plant body ranges from an undifferentiated mass of protoplasm to a well-developed and much- branched mycelium. Reproduction is mainly sexual, by the formation of conidia or sporangia; but the group shows every form of transition from this method through simple conjugation to perfe…

etable cell, out of which the various tissues are formed by a process of differentiation; protoplasm.