Bacterioplankton Activity in a Meso-eutrophic Subtropical Coastal Lagoon.

The aim of this study was to investigate whether the bacterioplankton activity in the meso-eutrophic Conceição Lagoon would increase significantly under allochthonous inputs of inorganic nutrients and organic carbon. Abundance and biomass of bacterioplankton were evaluated under three treatments: light (14 h light/10 h dark), complete darkness (dark-control), and nutrient (C + N + P-dark, 100 : 10 : 1) enrichments during 72 h. Nutrient enrichments promoted a significant increase in abundance (maximum of 19.

Southern Brazilian autumnal propolis shows anti-angiogenic activity: an in vitro and in vivo study.

The present study focuses on the effects of a hydro-alcoholic propolis extract collected in autumn (2010) in Santa Catarina State (Southern Brazil), on the angiogenesis, using in vitro and in vivo models. Cultures of human umbilical vein endothelial cells were used to assess the effects of propolis on viability, proliferation, and cell migration, as well as capillary tube formation. The propolis autumnal extracts significantly decreased the cell viability, based on CC50 values, which decreased (56%) from 297 to 130 μg/ml in 24 h and 72 h of treatment, respectively (cytotoxicity assay).

Cellulose biosynthesis by the beta-proteobacterium, Chromobacterium violaceum.

The Chromobacterium violaceum ATCC 12472 genome was sequenced by The Brazilian National Genome Project Consortium. Previous annotation reported the presence of cellulose biosynthesis genes in that genome. Analysis of these genes showed that, as observed in other bacteria, they are organized in two operons.