PubMed Health⌕ Search

PubMed · 8496461

Fish scale-induced dermatitis.

Abstract

BACKGROUND: Fish scales loosened during the process of cleaning that come in contact with human skin will adhere and "grow," creating a raised skin lesion if not washed off immediately. OBJECTIVE: The purpose of this study was to examine the process of fish scale-induced dermatitis. METHODS: Fish scales from the blue gill (Lepomis machrochirus) were placed on the intact skin of denuded Swiss Webster mice that had no prior sensitization. RESULTS: The scales physically adhered and formed a raised fold of skin within minutes after placement. Lesions were submitted for pathologic evaluation on days 2 and 7. A subacute irritant dermatitis was observed that evolved into a chronic dermatitis with hyperkeratosis. Inverted fish scales (the anatomically reversed surface) and fish epidermis did not produce such lesions on the mice. CONCLUSION: Fish scales are able to induce an irritant dermatitis. They most likely do so through initial adhesion via mucopolysaccharide secretions.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

F Y Chiou, J A Tschen. 1993. Fish scale-induced dermatitis.. https://doi.org/10.1016/0190-9622(93)70138-j

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

Effect of capillary condensation on friction force and adhesion.

Friction force measurements have been conducted with a colloid probe on mica and silica (both hydrophilic and hydrophobized) after long (24 h) exposure to high-humidity air. Adhesion and friction measurements have also been performed on cellulose substrates. The long exposure to high humidity led to a large hysteresis between loading and unloading in the friction measurements with separation occurring at large negative applied loads. The large hysteresis in the friction-load relationship is attributed to a contact area hysteresis of the capillary condensate which built up during loading and did not evaporate during the unloading regime. The magnitude of the friction force varied dramatically between substrates and was lowest on the mica substrate and highest on the hydrophilic silica substrate, with the hydrophobized silica and cellulose being intermediate. The adhesion due to capillary forces on cellulose was small compared to that on the other substrates, due to the greater roughness of these surfaces.

Adhesiveness↗

Evaluation of bond strength of soft relining materials to denture base polymers.

OBJECTIVES: To evaluate the initial bonding properties of recently and previously introduced soft relining materials to denture base polymers with different polymerization techniques and different water content. METHODS: The initial tensile bond strength of 10 soft liners (Mollosil Plus, Dentusil, Ufi gel Soft, GC Reline Soft, Silagum Comfort, Vertex Soft, Astron Soft, Molloplast B, Flexacryl Soft, Triad Resiline) to three denture base polymers (Paladon 65, Palapress Vario, Ivocap Plus) were assessed with a modified method. Paladon 65 specimens immersed in water for 3 months were also used to test the effect of water content of denture base polymer on bond strength results. After testing, a visual examination of the fracture surfaces and a SEM investigation of the interface structure were performed. Tensile strength of each soft liner material was also tested. Data were analyzed statistically by two-way ANOVA (alpha = 0.05). RESULTS: Significant differences were found among tensile bond strength results (P < 0.05). Vinyl poly(organosiloxane) soft liners (Mollosil Plus, Dentusil, Ufi gel Soft, GC Reline Soft, Silagum Comfort) and a plasticized PMMA soft liner (Vertex Soft) gave statistically similar bond strength results for different denture base polymers (P>0.05). For the other materials used (Astron Soft, Molloplast B, Flexacryl Soft, Triad Resiline), different denture base polymers caused significantly different results (P < 0.05). Poly(organosiloxane) based materials gave slightly higher bond strength results with water immersed specimens than with the dry specimens. SIGNIFICANCE: A wide variety of newly formulated soft liners used in this study gave comparable or better bond strength results compared to Molloplast B.

Adhesiveness↗

Flat and sigmoidally curved contact zones in vesicle-vesicle adhesion.

Using the membrane-bending elasticity theory and a simple effective model of adhesion, we study the morphology of lipid vesicle doublets. In the weak adhesion regime, we find flat-contact axisymmetric doublets, whereas at large adhesion strengths, the vesicle aggregates are nonaxisymmetric and characterized by a sigmoidally curved, S-shaped contact zone with a single invagination and a complementary evagination on each vesicle. The sigmoid-contact doublets agree very well with the experimentally observed shapes of erythrocyte aggregates. Our results show that in identical vesicles with large to moderate surface-to-volume ratio, the sigmoid-contact shape is the only bound morphology. We also discuss the role of sigmoid contacts in the formation of multicellular aggregates such as erythrocyte rouleaux.

Adhesiveness↗