Biomedical subjects

S Stöckel

Publications and source records attributed to S Stöckel.

6 recordsLinked to original sources

PubMed2003

Comparative investigations of structure and properties of BCN coatings deposited by thermal and plasma-enhanced CVD.

Hard BCN films were deposited by chemical vapour deposition (CVD) on Si(100) substrates. TCVD (thermal activated) and PECVD (GD or RF microwave plasma-activated, respectively) were used. The films were analysed with respect to chemical state, composition, morphology and microstructure, oxidation behaviour and hardness. Wavelength dispersive X-ray spectroscopy (EPMA), infrared spectroscopy (IR), transmission electron microscopy (TEM), differential thermal analysis (DTA) and hardness evaluation were employed for film characterization. A correlation between deposition parameters and film composition, structure and hardness could be proved in every CVD process. Parallels between TCVD and PECVD films emerged in the case of chemical composition and the correlation between carbon content and hardness values. Considerable differences exist with regard to the microstructure, especially the texture of the films. Moreover in TCVD films the carbon is preferentially incorporated between the BN basal planes, whereas in PECVD films it is incorporated preferentially in as well as between the BN basal planes.

Journal Article↗

PubMed2002

[Giant cavernous hemangioma of the scalp].

Cavernous hemangiomas of the scalp associated with vascular tumors of the skull occur rarely in older patients. Giant hemangiomas can cause complications secondary to extensive bleeding. Here we report on a 78-year-old female presenting with a giant ulcerated cavernous hemangioma of the scalp. Before admission to the hospital, she had suffered from severe bleeding of the vascular tumor, with resulting anemia. Because of her cardiovascular disease, the tumor mass, and possible vascular connections to osseous hemangiomas, complete surgical removal of the hemangioma was not indicated. Therefore the superficial ulceration was covered with a split skin transplant. After complete wound healing, no further bleeding occurred.

Aged↗

PubMed2002

[Multiple miliary osteomas of the face].

Osteoma cutis is a single or multiple ectope calcification with development of bony structures in the skin. We distinguish between primary and secondary ossification. Multiple miliary osteoma in the face has mostly been described secondary to preexisting acne vulgaris. We present a 62-year-old woman who developed multiple miliary osteoma in the face together with repeated doses of estrogen and discuss pathogenesis and therapeutic possibilities.

Biopsy↗

PubMed1997

[Not Available].

Explore the source record for details and available documents.

Germany↗

PubMed1997

[Not Available].

Explore the source record for details and available documents.

Child↗

PubMedDate not supplied

Dapsone-induced photodermatitis in a patient with linear IgA dermatosis.

Dapsone (4, 4' diaminodiphenylsulfone) is an efficient antiinflammatory agent. Its therapeutic use may result in a variety of adverse effects. The most frequent unwanted reactions are hemolytic anemia and methemoglobinemia. By oral route dapsone is mainly metabolized to monoacetyldapsone (MADDS) and hydroxylamine dapsone (DDS-NOH). We report a 76-year-old female patient with linear IgA dermatosis who developed a dapsone-induced photosensitivity 8 weeks after initiation of sulfone therapy. She showed a widespread erythematous eruption in UV-exposed skin area. After clearing of skin lesions the photopatch test revealed positive reactions to dapsone, MADDS and DDS-NOH. Dapsone-induced photosensitivity to date has been described only in leprosy patients. We demonstrate for the first time that this adverse reaction is not restricted to leprosy and that dapsone metabolites may also contribute to the mechanism of photosensitivity like the parent sulfone. Dapsone-induced photosensitivity is a rare, not dose-related adverse effect of the sulfone and can also occur in patients with inflammatory skin disorders.

Aged↗