scholarly journals Fine structure and distribution of photoreceptor cells under the antacoria of antennae in the American cockroaches

1995 ◽  
Vol 46 (2) ◽  
pp. 209
Author(s):  
Kiku Okamoto
Keyword(s):  
Fine Structure ◽  
Photoreceptor Cells

Sequence of Changes in the Fine Structure of the Retina of Dogs Irradiated During Retinal Maturation

1967 ◽  
Vol 25 ◽  
pp. 166-167
Author(s):  
James N. Shively ◽  
Robert D. Phemister ◽  
Glenwood P. Epling
Keyword(s):  
Fine Structure ◽  
Ionizing Radiation ◽  
Photoreceptor Cells ◽  
Rosette Formation ◽  
Severe Dysplasia ◽  
Outer Segments ◽  
Mammalian Retina ◽  
Retinal Dysplasia

It has been known since early in this century that exposure to ionizing radiation during maturation of the mammalian retina results in necrosis of post-mitotic differentiating cells in the nuclear layer, followed by marked retinal dysplasia with rosette formation, and partial to complete agenesis of outer segments of photoreceptor cells. The effect has been morphologically related to the area of the retina undergoing differentiation at the time of irradiation. Alteration in spacial and pressure relationships are said to result in the tubular rosette formations. These effects have been described in mice, rats, monkeys, dogs and man. Doses less than 25 R have produced severe dysplasia in the developing retina of mice. The mature retina is damaged only by doses of several hundred to a few thousand R.

Fine structure of photoreceptor cells in the earthworm, Lumbricus terrestris

1970 ◽  
Vol 104 (3) ◽  
pp. 345-357 ◽  
Author(s):  
P. R�hlich ◽  
B. Aros ◽  
Sz. Vir�gh
Keyword(s):  
Fine Structure ◽  
Lumbricus Terrestris ◽  
Photoreceptor Cells ◽  
Earthworm Lumbricus

Pineal Photoreceptor Cells in Culture: Fine Structure, and Light/ Dark Control of Cyclic Nucleotide Levels and Melatonin Secretion

1992 ◽  
Vol 4 (5) ◽  
pp. 641-651 ◽  
Author(s):  
Jack Falcoón ◽  
Valérie Bégay ◽  
Colette Besse ◽  
Jean-Paul Ravault ◽  
Jean-Pierre Collin
Keyword(s):  
Fine Structure ◽  
Cyclic Nucleotide ◽  
Photoreceptor Cells ◽  
Melatonin Secretion ◽  
Dark Control ◽  
Cells In Culture

Fine Structure of Platelet Interaction with a New Microcrystalline Collagen Preparation

1974 ◽  
Vol 32 ◽  
pp. 58-59
Author(s):  
W. H. Zucker ◽  
R. G. Mason
Keyword(s):  
Fine Structure ◽  
Platelet Aggregation ◽  
Hydrochloric Acid ◽  
Whole Blood ◽  
Platelet Adhesion ◽  
Hemostatic Agent ◽  
Native Collagen ◽  
Fibrillar Morphology ◽  
Clinical Interest ◽  
New Form

Platelet adhesion initiates platelet aggregation and is an important component of the hemostatic process. Since the development of a new form of collagen as a topical hemostatic agent is of both basic and clinical interest, an ultrastructural and hematologic study of the interaction of platelets with the microcrystalline collagen preparation was undertaken.In this study, whole blood anticoagulated with EDTA was used in order to inhibit aggregation and permit study of platelet adhesion to collagen as an isolated event. The microcrystalline collagen was prepared from bovine dermal corium; milling was with sharp blades. The preparation consists of partial hydrochloric acid amine collagen salts and retains much of the fibrillar morphology of native collagen.

Pituitary Follicular Cells: Their Origin, Possible Function and Fate

1974 ◽  
Vol 32 ◽  
pp. 34-35
Author(s):  
E. Horvath ◽  
K. Kovacs ◽  
G. Penz ◽  
C. Ezrin
Keyword(s):  
Fine Structure ◽  
Secretory Granules ◽  
Follicular Cells ◽  
Human Pituitary ◽  
Rat Pituitary ◽  
Pituitary Glands ◽  
Junctional Complexes

Follicular structures, in the rat pituitary, composed of cells joined by junctional complexes and possessing few organelles and few, if any, secretory granules, were first described by Farquhar in 1957. Cells of the same description have since been observed in several species including man. The importance of these cells, however, remains obscure. While studying human pituitary glands, we have observed wide variations in the fine structure of follicular cells which may lead to a better understanding of their morphogenesis and significance.

Ultrastructure and Staining of Developing Elastic Tissue

1971 ◽  
Vol 29 ◽  
pp. 244-245
Author(s):  
E. N. Albert
Keyword(s):  
Fine Structure ◽  
Phosphotungstic Acid ◽  
Staining Method ◽  
Rat Aorta ◽  
Uranyl Acetate ◽  
The Other ◽  
Elastic Fibers ◽  
Elastic Tissue ◽  
Lead Citrate ◽  
New Born

Silver tetraphenylporphine sulfonate (Ag-TPPS) was synthesized in this laboratory and used as an electron dense stain for elastic tissue (Fig 1). The procedures for the synthesis of tetraphenylporphine sulfonate and the staining method for mature elastic tissue have been described previously.The fine structure of developing elastic tissue was observed in fetal and new born rat aorta using tetraphenylporphine sulfonate, phosphotungstic acid, uranyl acetate and lead citrate. The newly forming elastica consisted of two morphologically distinct components. These were a central amorphous and a peripheral fibrous. The ratio of the central amorphous and the peripheral fibrillar portion changed in favor of the former with increasing age.It was also observed that the staining properties of the two components were entirely different. The peripheral fibrous component stained with uranyl acetate and/or lead citrate while the central amorphous portion demonstrated no affinity for these stains. On the other hand, the central amorphous portion of developing elastic fibers stained vigorously with silver tetraphenylporphine sulfonate, while the fibrillar part did not (compare figs 2, 3, 4). Based upon the above observations it is proposed that developing elastica consists of two components that are morphologically and chemically different.

The Dermal Glands of Rhodnius Prolixus

1969 ◽  
Vol 27 ◽  
pp. 258-259
Author(s):  
J. E. Lai-Fook
Keyword(s):  
Fine Structure ◽  
Secretory Activity ◽  
Rhodnius Prolixus ◽  
Outermost Layer ◽  
Cement Layer ◽  
Dermal Glands

Dermal glands are epidermal derivatives which are reported to secrete either the cement layer, which is the outermost layer of the epicuticle or some component of the moulting fluid which digests the endocuticle. The secretions do not show well-defined staining reactions and therefore they have not been positively identified. This has contributed to another difficulty, namely, that of determining the time of secretory activity. This description of the fine structure of the developing glands in Rhodnius was undertaken to determine the time of activity, with a view to investigating their function.

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