Sometimes the perithecia are solitary or scattered, and sometimes gregarious, whilst in other instances they are closely aggregated and immersed in a stroma of variable size and form.
The little subglobose bodies which spring from a common stroma or stem are hollow shells or capsules, externally granular, internally filled with a gelatinous nucleus.
This will lead to the suspicion, which can afterwards be verified, that the red heads are really produced on the stem or stroma of the pink tubercles.
Here, then, we have undoubted evidence of Nectria cinnabarina, with its fruit, produced in asci growing from the stroma or stem, and in intimate relationship with what was formerly named Tubercularia vulgaris.
There is no proper excipulum or peridium, and the spores spring direct from a more compacted portion of the mycelium, or from a cushion-like stroma of small cells.
In several species of Dermatea the stylospores and spermatia co-exist, but they are disseminated before the appearance of the ascigerous receptacles, yet they are produced upon a common stroma not unlike that of Tubercularia.
In the pileate forms, the stroma is fleshy and highly developed; in the cup-shaped, it is reduced to the external cells of the cup which enclose the hymenium.
When the spermatia are expelled, the stromathickens for the production of asci and sporidia, which are afterwards developed during the autumn and winter.
A perithecium, or cell excavated in thestroma which fulfils the functions of a perithecium, is always present.
In other Craniata the ridge, though at first in this condition, very soon becomes much more prominent, and is formed of a central core of stroma enclosed in the germinal epithelium (fig.
The growths of stroma into the germinal epithelium appear shortly after the formation of the earlier follicles.
The layer of stroma below the superficial epithelium forms in the mammalian ovary the tunica albuginea.
The cells which form this are, as has been already explained, derived from the germinal epithelium[25], and frequently arrange themselves around the ovum before the appearance of the growths of stroma into the epithelium.
The stroma grows into the germinal epithelium while it is still formed of rounded indifferent cells, and divides it into trabeculae as described above.
Amphibia the ovary remains during embryonic life nearly in this condition, though a small prominence of the adjacent stroma also becomes formed.
When pus forms it may infiltrate the stroma of the gland, or may be collected into several small foci.
The pigment layer does not atrophy in proportion to the stroma of the iris; by the contraction of the stroma of the pigment layer is doubled upon itself at the pupillary margin, forming a black ring of greater or less width (ectropian uveae).
Where the iris tissue lies in contact with the cornea, the stroma of the iris almost totally disappears.
As the disease progresses, the stroma of the iris atrophies and contracts.
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.
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.
The stroma is vertical and fleshy, head distinct, hyaline or colored; sporidia repeatedly divided and sub-moniliform.
Under Xylariæi we have: Stipitate-- Stroma corky, subelavate Xylaria.
Cancer of the stomach is characterized anatomically by the formation in this organ of a new growth, composed of a connective-tissue stroma so arranged as to enclose alveoli or spaces containing cells resembling epithelial cells.
Histologically, medullary cancer is composed of a scanty stroma of connective tissue enclosing an abundance of cancerous alveoli filled with polyhedrical or cylindrical epithelial cells.
The stroma is often richly infiltrated with lymphoid cells, and contains blood-vessels which often present irregular dilatations of their lumen.
Microscopic examination shows the lardaceous material in the vessels, and also in the stroma of the mucous membrane and villi.
The fibrous stromawhich extends through this central soft material has a reticulated arrangement and a shining, fibrous appearance.
Ulceration is extensive, and one may here also often discover the villous, tufted appearance of villous cancer, caused by the fringe-like shreds of stroma entangling cellular elements not yet detached from the mass.
The stroma is generally scanty and rich in cells, but it may be abundant.
These new cells excite proliferation of the cells of the connective-tissue stroma and of the epithelium.
The ovary is exceptional, on account of the large size of the stromaingrowths into the epithelium.
The follicular epithelium is much thicker on the side adjoining the stroma than on the upper side of the ovum.
The stroma of the ovarian ridge is exceptionally scanty.
The mucous and colloid cancers are those whose alveolar contents or stroma have undergone a mucous or colloid degeneration.
These are hard, firm, and resistant, and histologically consist of a dense fibrous stroma interspersed with the spindle-shaped cells.
Hemorrhages into the stroma of the kidneys, the Malpighian tufts, and the uriniferous tubules arrest urinary secretion, and thus entail death.
The degenerations of the epithelioid cells and stroma suggest qualifying terms.
He is again on record in 1713, in which year he disponed the Nethertoun of Stroma to his nephew, Murdoch Kennedy, son of his sister Jane, and her husband, John Kennedy of Carmunks.
In 1706 he appears among the heritors of Caithness for the Nethertoun of Stroma in the parish of Canisbay.
If the alveoli are large and the intervening stroma is scanty and delicate, the tumour is soft and brain-like, and is described as a medullary or encephaloid cancer.
If the alveoli are small and the intervening stroma is abundant and composed of dense fibrous tissue, the tumour is hard, and is known as a scirrhous cancer--a form which is most frequently met with in the breast.
Melanin pigment is formed in relation to the cells and stroma of certain epithelial tumours, giving rise to melanotic cancer, one of the most malignant of all new growths.
An aborally-placed motor nerve-centre gives off branches to the stroma connecting the various plates of the theca and of its brachial, anal and columnar extensions, and thus co-ordinates the movements of the whole skeleton.
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 remainder of the stroma of the ovarian ridge has now acquired a definite structure, which remains constant through life, and is eminently characteristic of the genital ridge of both sexes.
Apart from these more obvious points, an examination of the follicle cells from the surface, and not in section, demonstrates that the general resemblance in shape of follicle cells to the stroma cells is quite delusory.
In the full-grown female the stroma of the ovarian region is denser and has a more fibrous aspect than in the younger animal.
In the stroma many isolated cells are present, which appear to me, from a careful comparison of a series of sections, to belong to the germinal epithelium.
The ovary of this age was preserved in osmic acid, which is the most favourable reagent, so far as I have seen, for observing the relation of the stroma and epithelium.
In the ovaries of very young animals the cells of the follicular epithelium are more columnar on the side towards the stroma than on the opposite side, but this irregularity soon ceases to exist.
The inspection of a single such nest is to my mind a satisfactory proof that the follicular epithelium takes its origin from the germinal epithelium and not from the stroma or tubuliferous tissue.
Part of the stromaeventually forms a layer close below the surface, which becomes in the adult the tunica albuginea.
Between the columns of it are numerous vascular channels (shewn diagrammatically in my figures) and a few normal stroma cells.
Stroma hollow, filled with a brown mass of spores and hyphae remnants.
This might be made a genus, corresponding to Hypoxylon as to stroma, but having the stroma hollow and filled with a pulverulent mass.
Perithecia carbonous, forming several stratose layers, imbedded in the stroma in the depressions.
In the latter case the black stroma at the base was thicker and more in evidence.
Diabella calculates, that with the same amount of hæmoglobin in two blood testings, the stroma may effect differences of 3-5 per thousand in the specific gravity.
Should the parallelism between the number of red blood corpuscles and the amount of hæmoglobin be considerably disturbed, the influence of the stroma of the red discs on the specific gravity of the blood will then be recognisable.
The surroundingstroma loses its vascularity, the prominence at this part of the ovary gradually subsides, and the ovary returns to its former size.
Upon impregnation taking place, one or more of the most prominent Graafian vesicles begins to show marks of considerable vascularity, both in its external capsule and in the surrounding stroma of the ovary.
In the substance of the stroma are embedded a number of vesicles of various sizes, which, although previously described by Vesalius and Fallopius, have been called Graafian vesicles, after De Graaf.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "stroma" in a variety of sentences. We hope that you will now be able to make sentences using this word.
