Results 211 to 220 of about 87,734 (258)

Pigmentation pattern formation on snakes

Journal of Theoretical Biology, 1991
We consider a cell-chemotaxis model mechanism for generating some of the common, simple and complex, patterns found on the skin of snakes. By investigating the pattern generation potential of the model we show that many of the more complex patterns might result from growth of the integument during the pattern formation process.
J D, Murray, M R, Myerscough
openaire   +2 more sources

Pattern Dystrophy of the Pigment Epithelium

American Journal of Ophthalmology, 1977
Three generations of a family showed alterations in the retinal pigment epithelium along with mild visual disturbance. Younger members had granular pigment dispersed beneath the fovea while older members showed a reticular pigment pattern. The electro-oculogram was subnormal in most affected individuals, but visual fields, color vision, dark adaptation,
M F, Marmor, B, Byers
openaire   +2 more sources

Method for disarranging the pigment pattern of zebrafish by optogenetics

Developmental Biology, 2020
To investigate the spatiotemporal dynamics of skin pattern formation, we developed a simple method for artificially disarranging the placement of all three pigment cell types in the body trunk of zebrafish (Danio rerio). We generated transgenic fish with melanophores that ectopically expressed a variant of channelrhodopsin-2 (ChR2).
Shigeru Kondō
exaly   +3 more sources

Pattern Dystrophy of the Retinal Pigment Epithelium

Ophthalmology, 1982
The pattern dystrophies are a group of hereditary macular dystrophies characterized by lesions of the retinal pigment epithelium (RPE) arranged in various patterns of dots, lines, and branched figures. This report of two pedigrees expands the clinical spectrum.
James C. Folk, Robert C Watzke, R C Watzke   +2 more
exaly   +3 more sources

Pattern dystrophies of the retinal pigment epithelium

Acta Ophthalmologica Scandinavica, 1996
ABSTRACT Pattern dystrophies of the retinal pigment epithelium are infrequent fundus abnormalities arranged in various patterns of dots, lines and branches. The basic lesion appears to be yellow deposits of abnormal lipofuscin accumulated within degenerated retinal pigment epithelium cells.
S, Daniele, A, Carbonara, C, Daniele, G, Restagno, F, Orcidi   +4 more
openaire   +2 more sources

Patterned Pigmentation in Children

Pediatric Clinics of North America, 2010
The terms pigmentary mosaicism or patterned dyspigmentation describe a spectrum of clinical findings that range from localized areas of dyspigmentation with no systemic findings to widespread dyspigmentation with associated neurologic, musculoskeletal, and cardiac abnormalities, and other sequelae that can lead to early demise. Given this wide spectrum,
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Computer simulation of a Mulluscan pigmentation pattern

Journal of Theoretical Biology, 1969
The formal characteristics of a colour pattern of complex appearance on a molluscan shell were studied by developing a computer program which produces an acceptable simulation of it. The pattern clearly involves a random factor determining points of initiation of diverging lines of pigment.
C H, Waddington, R J, Cowe
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Pattern dystrophy of the retinal pigment epithelium

International Ophthalmology, 1987
We describe six related patients presenting with an autosomal dominantly inherited pattern dystrophy of the retinal pigment epithelium, significantly abnormal electro-oculogram and minor colour vision abnormalities. There is a continuum of variable phenotypic expression within the pattern dystrophies of the retinal pigment epithelium.
A Pinckers, J R Cruysberg
exaly   +3 more sources

Patterned Dystrophies of the Retinal Pigment Epithelium

Archives of Ophthalmology, 1977
Three varieties of patterned dystrophies of the retinal pigment epithelium have been described in the literature: They are reticular dystrophy, macroreticular dystrophy, and butterfly-shaped pigment dystrophy of the fovea (macula). They are all inherited and are bilateral and symmetric.
R C, Hsieh, B S, Fine, J S, Lyons
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PATTERN DYSTROPHY OF THE RETINAL PIGMENT EPITHELIUM

Retina, 1990
The authors describe a family in which one member had pattern dystrophy of the retinal pigment epithelium. The proband also had neovascular membranes which resulted in decreased visual acuity. Two other family members had abnormal electro-oculographic findings, but a clinical normal-appearing fundus that could represent an early stage of the disease ...
T, Shiono, A, Ishikawa, S, Hara, M, Tamai   +3 more
openaire   +2 more sources