Patchy senile elastoma of the lip resembling leukoplakia

No Abstrac

Pyridine nucleotide micro-assay by the method of slater and sawyer

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Dermatology of the infant

No Abstract

Development of the springbok skin — colour pattern, hair slope and horn rudiments in Antidorcas marsupialis

In the foetal springbok skin, identifiable melanocytes are present before colour patterns are established. These pigment cells fail to appear in the pouch and belly areas, indicating that these zones are piebald and not albinotic. Areas of regional colour differences are sharply separated. Their distinctiveness is caused by a discontinuous change in brightness of the hairy coat. This is due to a stepwise shift in the average quanta of melanin in the hairs. The pigment itself does not alter its colour from one colour-zone to another, but the density of the pigment particles merely changes. It is suggested that the steps could correspond to a discontinuous difference in tissue dosage, resulting perhaps from differing activation among multiple melanizing genes. Anatomical peculiarities of the pouch area and horn rudiment are described. A proposal is made that hair slope is brought about by traction from mobile superficial fibroblasts. These cells travel preferentially in the direction of the greatest tissue strain. By dragging the papillary layer components along behind them, such as the hair buds and arrector pili muscles, the hair streams could arise. The tips of the hair shafts will then point away from each direction of greatest internal expansion, which the fibroblasts strive to cover

Scleromyxoedema

No Abstract

Dermatomyositis in the Transvaal and its occurrence in the bantu

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Book Reviews

Book Review 1Book Title: Early Life Histories of Fishes: New Developmental, Ecological and Evolutionary PerspectivesBook Author: Edited by E.K. BalonDr W. Junk, Dordrecht. 280 pp.Book Review 2Book Title: Comparative Aspects of Extracellular Acid-base BalanceBook Author: J.P. TruchotSpringer, 1987. 248 pp. 51 figures.Book Review 3Book Title: Insect Flight: Dispersal and MigrationBook Author: Edited by W. DanthanarayanaSpringer-Verlag, Berlin, 1986. 289 pp.Book Review 4Book Title:  The Mammalian Herbivore Stomach. Comparative Anatomy, Function and EvolutionBook Author: Peter LangerGustav Fischer, Stuttgart, 1988. 557 pages, 246 figures and 72 tablesBook Review 5Book Title:  Biology of the Integument. Vol. 2: VertebratesBook Authors: Edited by J. Bereiter-Hahn, A.G. Matoltsy & K.S. RichardsSpringer, Berlin, 1986. 855 pp.Book Review 6Book Title:  Advances in the Biology of Turbellarians and related PlatyhelminthesBook Author: Edited by Seth TylerDr. W. Junk Publishers, 1986. 357 pages; 253 figuresBook Review 7Book Title: Evolutionary Physiological EcologyBook Author: Edited by P. CalowCambridge University Press, Cambridge. 239 pp.Book Review 8Book Title: DragonfliesBook Author: Peter L. MillerCambridge University Press, Cambridge, New York and Melbourne, 1987. 84 pp

A fault of epidermal protein metabolism in psoriasis: A biochemical review

No Abstrac

Hyalinosis cutis et mucosae (lipoid proteinosis)

No Abstrac