Antibacterial activity of Thymus phenols by direct bioautography

Planar chromatography is a powerful technique for separating certain classes of compound of biological interest. In higher plants there are many substances which have antimicrobial effect. Bioautography is a method to localize antibacterial activity on a chromatogram. Thymol and carvacrol have antibacterial effect against Erwinia amylovora and Erwinia carotovora. Rosmarinic and caffeic acids were detected in some Thymus taxa but have no antibacterial activity with direct bioautography

SHEAR PARAMETERS OF VARVED CLAY

Investigations on changes of shear parameters of varved clay with different approaches in triaxial test and direct shear are subject of the following paper. Also statistical estimation of physical parameters of clay in soil massif has been presented and the usefulness of normal distribution in selecting adequate probablistic model of variability distribution of shear resistance coefficient in direct shear test has been evaluated

Effect of the grape chrome-mosaic and grape fanleaf yellow-mosaic virus-infection on the photosynthetical carbon dioxide fixation in vine-leaves

The intensity of photosynthetical C02-fixation in red Veltliner leaves, strongly or slightly infected with GCM, was compared with leaves of healthy individuals. Leaves of white Sultana, slightly infected with GFYM virus were also compared with leaves of healthy plants. The photosynthetic activity was calculated by measuring the CO2-fixation in dark and in light and the data thus obtained were compared with the content of chlorophyll. In GCM infected leaves with slight symptoms the chlorophyll level and the intensity of photosynthetical CO2 -fixation gradually decreased; in leaves with severe symptoms, the specific activity (CO2-fixation/mg chlorophyll) was relatively higher, presumably· due to the increased transparency of the tissues. After GFYM infection the photosynthetical CO2-fixation decreased strinkingly, independently of the strength of leaf symptoms. It is supposed that the destruction of the chlorophyll-protein-complexe caused by the virus infection asserts an inhibiting effect on the photosynthetic activity

Meteorite Like Nano and Pico Space Devices and Robots and the Polar Region of Mars

第3回極域科学シンポジウム/第35回南極隕石シンポジウム 11月29日（木）、30日（金） 国立国語研究所 2階講