Search

Mit Hilfe einer kalorimetrischen Mesanordnung wurden der Mechanismus und die Kinetik der Radikalbildung aus Dibenzoylperoxid und aromatischem tertiaren Amin untersucht. Es konnte gezeigt werden, das nicht nur die Benzoyloxi-, sondern auch Aminradikale die Polymerisation von Methacrylaten auslosen. The mechanism and the kinetics of the formation of radicals from dibenzoyl peroxide and aromatic amine were investigated by means of a calorimeter. It is shown that both the benzoyloxy radicals and the amine radicals are able to start the polymerization of methacrylates.

Zur Charakterisierung von zwei unfraktionierten Polystyrenmustern unterschiedlicher Molmassenverteilung wurde ein Ringversuch durchgefuhrt, an dem 13 Laboratorien beteiligt waren. Die Proben wurden bei Vorgabe einzelner technischer Parameter mittels Membranosmometrie, Viskosimetrie, statischer und dynamischer Lichtstreuung und Ausschluschromatographie untersucht. A circular investigation with the participation of 13 laboratories has been carried out for the characterization of two unfractionated polystyrene samples with different molecular mass distribution. With some recommended technical parameters the samples were studied by membrane osmometry, viscosimetry, static and dynamic light scattering, and size exclusion chromatography.

A progress report on the use of hepatic function tests in detecting the blood carrier of viral hepatitis by means of hepatic function tests is presented. In the case of 29 single donors suspected of being hepatitis carriers who gave blood and who were examined in this hospital, three-fourths had one or more abnormal tests and one-half had an abnormal thymol turbidity and/or thymol flocculation tests. This is virtually the same incidence of abnormality as in imprisoned narcotic addicts. In the case of 29 single donors giving blood in the local Red Cross center or in Red Cross or community centers at a distance from Philadelphia on whom hepatic function tests were also done in this hospital, abnormal tests were found in only one-quarter, and thymol turbidity and/or thymol flocculation tests were abnormal in only one-sixth of them. These rates of abnormality are similar to those of the general donor population. It is suggested that persons from the lower social and economic classes of the large metropolitan centers of the United States who donate blood for a fee are apt to be alcoholics and narcotic addicts and are, therefore, more likely to be chronic carriers of viral hepatitis than are more stable elements of the population. It is in this group that the use of the thymol turbidity and flocculation tests appears to be valuable in a screening regimen for the carrier state of viral hepatitis.