Christina Wise

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The vast majority of ‘oil-droplets’ in the dark and light-adapted retinal twin-cones ofPoecilia reticulata is of the ‘matrix-type’. In bright light (day light+overhead strip light) there occurs in some regions a very pronounced numerical change from ‘matrix’ to ‘cristate-type’, whereas other regions remain unaffected. The functional significance of these(More)
The ultrastructure of the accessory outer segment (AOS) — a ciliumlike structure emanating from the inner segment and running alongside the outer segment of photoreceptors — is described. The AOS occurs in both rods and cones of Poecilia reticulata. Its ultrastructure, including the arrangement of microtubules, which originate from the ciliary stalk, is the(More)
Ultrastructural analyses of retinal development in the guppy embryo show that at midgestation all types of photoreceptors are differntiated in the fundus, and at birth differentiation extends over the whole retina. Formation of discs of outer segments is more rapid in rods than in cones. Double cones differentiate simultaneously with long single cones and(More)
The density and size distribution of intramembranous particles (IMP) were determined for cells of the erythroid series. The number and size of IMP were measured on both fracture faces of erythroblastic leukemia cells, phenylhydrazine-induced reticulocytes and mature erythrocytes. We found that the number of IMP adhering to the protoplasmic fracture face of(More)
The argentea of thePoecilia reticulata eye is divided into a black-iridescent dorsal and a silvery-iridescent ventral region. An opaque black patch lies on the dorso-ventral meridian passing through the optic nerve. The structure and ultrastructure of the various layers of the argentea and sciera are described. Three types of crystals occurring in the(More)
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