UV fine structure of the spectral sensitivity of flies visual cells

1980 ◽  
Vol 67 (11) ◽  
pp. 565-566 ◽  
Author(s):  
R. Gemperlein ◽  
R. Paul ◽  
E. Lindauer ◽  
A. Steiner
Keyword(s):  
Fine Structure ◽  
Spectral Sensitivity ◽  
Visual Cells

scholarly journals Spectral Sensitivity of Single Visual Cells

Nature ◽  
1961 ◽  
Vol 190 (4776) ◽  
pp. 639-639 ◽  
Author(s):  
H. AUTRUM ◽  
D. BURKHARDT
Keyword(s):  
Spectral Sensitivity ◽  
Visual Cells

Spectral sensitivity of visual cells of the compound eye ofBlatta orientalis

1985 ◽  
Vol 17 (1) ◽  
pp. 48-51 ◽  
Author(s):  
G. A. Mazokhin-Porshnyakov ◽  
A. D. Cherkasov
Keyword(s):  
Spectral Sensitivity ◽  
Compound Eye ◽  
Visual Cells

scholarly journals FINE STRUCTURE OF THE OCTOPUS RETINA

1965 ◽  
Vol 25 (2) ◽  
pp. 345-359 ◽  
Author(s):  
Toshiyuki Yamamoto ◽  
Kyoji Tasaki ◽  
Yoshio Sugawara ◽  
Akira Tonosaki
Keyword(s):  
Fine Structure ◽  
Plasma Membranes ◽  
Close Contact ◽  
Thick Layer ◽  
Layered Compound ◽  
Visual Cell ◽  
Supporting Cells ◽  
Blood Capillaries ◽  
Visual Cells ◽  
Capillary Endothelial Cells

The fine structure of the visual and the supporting cells and of the blood capillaries in the octopus retina is described. Lamellated structures contained in the proximal segment of the visual cell consist of compact arrays of dense membranes each of which is quintuple-layered and divides at its margins into two thinner sheets or membranes which are connected directly with the agranular or granular endoplasmic reticulum. Proximal to the deeper extremities of the rhabdomeres, the lateral plasma membranes of two adjoining visual cells contact each other forming a quintuple-layered compound membrane, which results in occlusion of the intercellular space. The central layer of the compound membrane is of high density, so that the membrane, as a whole, appears to be a single thick layer at low magnifications. The supporting cells are connected with the neighboring visual cells by two types of junctions. Long slender processes extend from the supporting cells to the surface of the retina through narrow spaces among the distal segments of the visual cells. The capillary endothelial cells are characterized by luminal surfaces irregularly contoured and by lateral surfaces elaborately interdigitated. The functional significance of the close contact between adjoining visual cells is discussed.

scholarly journals Properties of visual cells in the lateral eye of Limulus in situ.

1975 ◽  
Vol 66 (3) ◽  
pp. 303-326 ◽  
Author(s):  
E Kaplan ◽  
R B Barlow
Keyword(s):  
Optic Nerve ◽  
Spectral Sensitivity ◽  
Dark Adaptation ◽  
The Other ◽  
Low Light ◽  
Visual Cells ◽  
Increment Threshold ◽  
Lateral Eye ◽  
Nerve Recordings

Excitatory properties of visual cells in the lateral eye of Limulus, investigated by optic nerve recordings in situ, differ significantly from the properties of cells in the classical, excised eye preparation. The differences suggest the possibility that two receptor mechanisms function in the eye in situ: one mechanism encodes low light intensities and the other responds to high intensities. The two mechanisms enable each ommatidium to respond over an intensity range of approximately 10 log units. This hypothesis was tested by measuring the increment threshold and the spectral sensitivity, by studying light and dark adaptation, and by analyzing the variability of the impulse discharge. Although the results do not conclusively identify two receptor mechanisms, they indicate that a process or a part of a process that functions in the eye in situ is abolished by excising the eye or cutting off its blood supply.

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.

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