RESUMEN
The position of the connective tissue attachment was determined by Ramfjord's method in subjects aged 20-29 and 40-49 years. In the determination four surfaces of all remaining incisors, canines, and premolars were considered. A defect of the connective tissue attachment was found in about 95% of the analysed dental surfaces in subjects aged 40-49 years. The frequency of occurrence of these defects varied depending on the type dental surface.
Asunto(s)
Enfermedades Periodontales/patología , Adulto , Tejido Conectivo/patología , Humanos , Persona de Mediana Edad , Ligamento Periodontal/patologíaRESUMEN
Attempts to obtain burn toxin from animal and human skin are reported. Mouse skin was burned with a metal stamp by the method of Allgöwer. The human and the skin of various experimental animals was scalded in NaCl solution by the method of Rosenthal. Using the latter method it was possible to obtain the so-called "crude burn toxin" from the human skin. It was highly lethal to mice, rats, rabbits and guinea pigs after toxic. No toxic preparations were obtained from the skin of various experimental animals using the method of burning and processing described by Rosenthal.
Asunto(s)
Quemaduras , Piel/análisis , Extractos de Tejidos/análisis , Toxinas Biológicas/aislamiento & purificación , Adolescente , Adulto , Animales , Cercopithecus , Femenino , Cobayas , Humanos , Técnicas In Vitro , Masculino , Ratones , Persona de Mediana Edad , Conejos , Ratas , Porcinos , Toxinas Biológicas/toxicidadRESUMEN
Human skin and the skin of some laboratory animals was minced, scalded and homogenized. The preparation from scalded human skin (the "crude burn toxin") revealed to be highly toxic to mice after i.v. administration. It was found by immunodiffusion and immunoelectrophoresis, that the urea and buthanol extracts of the crude "toxin" contain tissue antigens which were absent in a control preparation from a native (non scalded) skin.