Postural Skin Colour Changes during the Corticosteroid Blanching Assay

1999 ◽  
Vol 12 (4) ◽  
pp. 199-210 ◽  
Author(s):  
F. Henry ◽  
I. Fumal ◽  
G.E. Piérard
Keyword(s):  
Skin Colour ◽  
Colour Changes

Reflectance spectrophotometric quantification of skin colour changes induced by topical corticosteroid preparations

1982 ◽  
Vol 106 (4) ◽  
pp. 437-444 ◽  
Author(s):  
J. W. FEATHER ◽  
K.S. RYATT ◽  
J.B. DAWSON ◽  
J.A. COTTERILL ◽  
D.J. BARKER ◽  
...  
Keyword(s):  
Topical Corticosteroid ◽  
Skin Colour ◽  
Colour Changes

scholarly journals A colorimetric comparison of sunless with natural skin tan

2020 ◽  
Author(s):  
Kinjiro Amano ◽  
Kaida Xiao ◽  
Sophie Wuerger ◽  
Georg Meyer
Keyword(s):  
Principal Component ◽  
Critical Factor ◽  
Skin Colour ◽  
Control Group ◽  
Naturally Occurring ◽  
Median Error ◽  
Natural Range ◽  
Colour Changes ◽  
The Difference ◽  
Cielab Colour

AbstractThe main ingredient of sunless tanning products is dihydroxyacetone (DHA). DHA reacts with the protein and amino acid composition in the surface layers of the skin, producing melanoidins, which changes the skin colour, imitating natural skin tan caused by melanin. The purpose of this study was to characterise DHA-induced skin colour changes and to test whether we can predict the outcome of DHA application on skin tone changes.To assess the DHA-induced skin colour shift quantitatively, colorimetric and spectral measurements of the inner forearm were obtained before, four hours and 24 hours after application of a 7.5% concentration DHA gel in the experimental group (n = 100). In a control group (n = 60), the same measurements were obtained on both the inner forearm (infrequently sun-exposed) and the outer forearm (frequently sun-exposed); the difference between these two areas was defined as the naturally occurring tan. Skin colour shifts caused by DHA tanning and by natural tanning were compared in terms of lightness (L*), redness (a*) and yellowness (b*) in the standard CIELAB colour space. Naturalness of the DHA-induced skin tan was evaluated by comparing the trajectory of the chromaticity distribution in (L*, b*) space with that of naturally occurring tan. Twenty-four hours after DHA application, approximately 20% of the skin colour samples became excessively yellow, with chromaticities outside the natural range in (L*, b*) space. A principal component analysis was used to characterise the tanning pathway. Skin colour shifts induced by DHA were predicted by a multiple regression on the chromaticities and the skin properties. The model explained up to 49% of variance in colorimetric components with a median error of less than 2 ΔE. We conclude that the control of both the magnitude and the direction of the colour shift is a critical factor to achieve a natural appearance.

EFFECT OF NEMBUTAL AND NIALAMIDE ON THE PARS INTERMEDIA AND SKIN COLOUR CHANGES IN RANA CYANOPHLYCTIS SCHNEIDER

1971 ◽  
Vol 68 (2) ◽  
pp. 264-270 ◽  
Author(s):  
N. H. Gopal Dutt ◽  
M. R. Rajasekharasetty
Keyword(s):  
Skin Colour ◽  
Prolonged Treatment ◽  
Pars Intermedia ◽  
Histochemical Analysis ◽  
Pentobarbital Sodium ◽  
Low Concentration ◽  
Colour Changes ◽  
Melanophore Stimulating Hormone ◽  
Stimulating Hormone

ABSTRACT The administration of pentobarbital sodium (nembutal) at low concentration causes darkening of the skin. However, at higher dose or after prolonged treatment a moderate blanching of the skin is noticed. Nialamide also produces a moderate blanching effect. Both these drugs considerably increase the number of colloid vesicles in the pars intermedia of the frog, Rana cyanophlyctis. These drugs, however, do not reverse the darkening of the skin due to ACTH in hypophysectomized frogs. Histochemical analysis suggests that the colloid vesicles may represent stored melanophore-stimulating hormone.

Morphological skin colour changes in teleosts

2009 ◽  
Vol 11 (2) ◽  
pp. 159-193 ◽  
Author(s):  
Eric Leclercq ◽  
John F Taylor ◽  
Hervé Migaud
Keyword(s):  
Skin Colour ◽  
Colour Changes

Observations on skin colour changes in juvenile lumpsuckers

1995 ◽  
Vol 47 (1) ◽  
pp. 143-154 ◽  
Author(s):  
J. Davenport ◽  
C. Bradshaw
Keyword(s):  
Skin Colour ◽  
Colour Changes

scholarly journals Autonomic Dysfunction Post-Inoculation with ChAdOx1 nCoV-19 Vaccine

2021 ◽  
Author(s):  
Keyvan Karimi Galougahi
Keyword(s):  
Single Dose ◽  
Autonomic Dysfunction ◽  
Skin Colour ◽  
Post Inoculation ◽  
Haemodynamic Changes ◽  
Colour Changes

Abstract This report describes persistent paresthesia, haemodynamic changes including orthostatic tachycardia, and skin colour changes due to autonomic dysfunction after a single dose of the ChAdOx1-nCoV-19 vaccine (AstraZeneca) in a healthy 29-year-old male.

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