Un lieu d'accueil et de soin pour personnes toxicomanes à Lausanne

Il s'agit d'un ensemble formé de deux bâtiments (centre de distribution d'héroïne et bureaux, restaurant) qui s'articulent autour d'une petite place par laquelle on accède depuis un escalier reliant les deux niveaux de la ville

Abundance and production of bacterioplankton in the Antarctic

The abundance and production rate of bacterioplankton in the Antarctic were measured in order to clarify their role in the food web. The production rate was estimated from the incorporation rate of [methyl-^3H] thymidine into TCA (trichloroacetic acid) insoluble fraction. In summer, the production in the upper layer ranged 0.45-5.2×(10)^7 cells/l/day, which correspond to e. g., 0.068-0.79μgC/l/day. The apparent doubling time of bacterial population was an order of a few days, which was equal to that observed in an equatorial area. Both abundance and production rate decreased with depth. The isotope dilution method to clarify the size of intracellular dTTP (deoxythymidine triphosphate) pool did not give meaningful data. The present results indicate that the abundance and production rate of bacterioplankton in the Antarctic were as high as those in an equatorial or temperate zone

Heterotrophic bacterial flora of the Antarctic Ocean

Vertical distribution of heterotrophic bacteria was surveyed at six sampling stations in the Antarctic and the Indian Oceans. Seawater samples were collected at various water depths, ranging from 0 to 2000m. Total bacterial counts were determined by the direct microscopic method. Plate counts were carried out by the surface spreading method and the filter method using ORI agar medium. At a sampling station in the Antarctic Ocean, the enumeration of oligotrophic bacteria was also made using an MPN method. The total bacterial counts per ml of seawater in the Antarctic region ranged from (10)^4 to (10)^5,whereas the plate counts by the filter method were (10)^0 to (10)^1 at the upper 500m layers and (10)^ to (10)^0 at the deeper water lyers. The plate counts at 2℃ incubation temperature were higher than those at 20℃ by 1-2 orders of magnitude for the samples at stations in the Antarctic region. In contrast, the 20℃ counts for seawater from the Indian Ocean were slightly higher than 2℃ counts. The surface spreading method gave bacterial counts that were one order of magnitude higher than the filter method, and the counts with the MPN method using diluted medium were greater still, reaching about 10% of total bacterial counts. The results suggested that a fairly large proportion of the bacterial population in Antarctic seawater is in the actively growing state. More than 87% of the bacterial strains isolated from surface water of the Antarctic Ocean were orange- and yellow-pigmented bacteria. Among the pigmented bacteria, Gram-negative, non-motile, orange-pigmented rods that appeared to constitute a single species belonging to Flavobacterium-Cytophaga predominated