Harald Brune

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Particles and semivolatiles from sidestream smoke of cigarettes smoked on a smoking machine were collected by a filter combination consisting of a glass fibre filter and silanized polystyrene beads. The extract of the glass fibre filter was separated by a Sephadex LH-20 column chromatography into a fraction containing non-aromatic material plus polycyclic(More)
The purpose of this investigation was to identify the substances mainly responsible for the carcinogenic effect of used engine oil from gasoline engines using topical application as a carcinogen-specific bioassay. This was performed by comparison of the tumorigenic effect of single fractions with that of an unseparated sample of the lubricating oil. The(More)
In a lifetime experiment benzo(a)pyrene (B(a)P) was administered to Sprague-Dawley rats either as an admixture to the diet or by gavage in an aqueous 1.5% caffeine solution. Dissolved benzo(a)pyrene induced more tumors of the forestomach than undissolved benzo(a)pyrene. The 1.5% caffeine solution (annual dose 27 g/kg) did not exert any carcinogenic activity(More)
Designing systems with large magnetic anisotropy is critical to realize nanoscopic magnets. Thus far, the magnetic anisotropy energy per atom in single-molecule magnets and ferromagnetic films remains typically one to two orders of magnitude below the theoretical limit imposed by the atomic spin-orbit interaction. We realized the maximum magnetic anisotropy(More)
The velocity and humidity dependence of nanoscopic sliding friction has been studied on CrN and diamondlike carbon surfaces with an atomic force microscope. The surface wettability is found to be decisive. Partially hydrophilic surfaces show a logarithmic decrease of friction with increasing velocity, the slope of which varies drastically with humidity,(More)
A 90-day feasibility study was performed in which rats and hamsters were exposed to the sidestream smoke of cigarettes. The only histopathological changes observed were hyperplasia and metaplasia of the epithelium covering the dorsal nasal turbinate bones in rats. These effects were reversible within 90 days.
Using a beeswax/tricaprylin mixture as vehicle, three doses each of acridine, benz[a]acridine (BaAC), benz[c]acridine (BcAC), dibenz[a,h]-acridine (DBa,hAC) and dibenz[a,j]acridine (DBa,jAC) were injected into the lungs of 35 female Osborne-Mendel rats per group. To compare the carcinogenic potency of the heterocycles, benzo[a]pyrene (BaP) was taken as(More)
The biologic activity of eight highly purified polycyclic aromatic hydrocarbons (PAH) widely distributed in the human environment was tested in the respiratory tracts of rats. These studies were performed for the examination of carcinogenic activity of the compounds and determination of a dose-response relationship. The lung implantation method was used in(More)
The urinary and faecal excretion of pyrene and 1-hydroxypyrene after oral (53.4%), intraperitoneal (3.1%), intratracheal (30-37%) and intrapulmonary application (0.003%) to rats has been determined by means of gas chromatography/mass spectrometry and the excretion rates were found to depend on the mode of application. With regard to the low urinary(More)