noun

definition

The tissue structure of an organ, etc., that serves to support it.

Examples of stroma in a Sentence

The fundamental substance or stroma is colorless and homogeneous.

Deep to these is the ovarian stroma, composed of fibrous tissue, and embedded in it are numerous nests of epithelial cells, the Graafian follicles, in various stages of development.

This stage takes place in the stroma of the chloroplasts and involve the fixation of carbon dioxide and the synthesis of glucose.

Originally the calcareous substance of the plates (stereom) was pierced by irregular canals, more or less vertical, and containing strands of the soft tissue (stroma) that deposited the stereom, as well as spaces filled with fluid.

This was interpreted as evidence of local disorder in the array of collagen fibrils that comprise the corneal stroma.

The most important histological element is the connective tissue stroma.

It is located in the anterior stroma of the cornea and consists of an infiltration of lipid (fat ).

All malignant salivary gland tumors expressed similar intense HA in tumor stroma.

This pro-inflammatory cytokine is especially important in tumor stroma interactions.

The 4.1 kDa N-terminal transit peptide appears to target the nuclear encoded gene product through the chloroplast envelope into the chloroplast stroma.

The coloring matters are not dissolved in the stroma of the chrornoplast, but exist as amorphous granules, with or without the presence of a protein crystal, or in the form of fine crystalline needles, frequently curved and sometimes present in large numbers, which are grouped together in various ways in bundles and give the plastids their fusiform or triangular crystalline shape.

It is located in the anterior stroma of the cornea and consists of an infiltration of lipid (fat).

Fibronectin, laminin, collagen type IV and tenascin were found in stroma of the lymphoid tissue.

Lung stroma, the tissue of the lung, serves a supportive role for the bronchi, bronchioles, and alveoli.

These types of pneumonia primarily infect the walls of the alveoli and the stroma of the lung.

Endometrial stroma and glands are tissues found only in the uterus.

Here we have the cushion-like type (stroma) of Nectria and many Pyrenomycetes, the clavate "receptacle" of Clavaria, &c., passing into the complex forms met with in Sparassis, Xylaria, Polyporei, and Agaricini, &c. In these cases the compound sporophore is often termed the hymenophore, and its various parts demand special names (pileus, stipes, gills, po--es, &c.) to denote peculiarities of distribution of the hymenium owlthe surface.

Other series of modifications arise in which the tissues corresponding to the stroma invest the sporogenous hyphal ends, and thus enclose the spores, asci, basidia, &c., in a cavity.

Another simple case is where the plane or slightly convex surface of the stroma rises at its margins and overgrows the sporogenous hyphal ends, so that the spores, asci, &c., come to lie in the depression of a cavity - e.g.

In such examples as the above we may regard the hymenium (Solenia, Cyphella), zygospores, or asci as truly invested by later growth, but in the vast majority of cases the processes which result in the enclosure of the spores, asci, &c., in a "fructification" are much more involved, inasmuch as the latter is developed in the interior of hyphal tissues, which are by no means obviously homologous with a stroma.

Whether a true sexual process precedes these processes or not does not affect the present question, the point being that the resulting spheroidal "fructification" (cleistocarp, perithecium) has a definite wall of its own not directly comparable with a stroma.

The simpler forms bear the perithecia directly on the mycelium, but the more highly developed forms often bear them on a special mycelial development - the stroma, which is often of large size and special shape and colour, and of dense consistence.

The stereom and stroma become arranged in folds and strands at right angles to the sutures of the thecal plates; in higher forms the stereom-folds are in part specialized as pectini-rhombs.

The fibrous theca externa merges with the surrounding stroma.

In other cases (Hypomyces, Nectria) the perithecia arise on an already mature stroma, while yet more numerous examples can be given (Poronia, Hypoxylon, Claviceps, &c.) where the perithecia originate below the surface of a stroma formed long before.

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