Relación entre las características petrográficas y geotécnicas de agregados de la provincia de Buenos Aires

En este trabajo se presentan las relaciones encontradas entre los primeros resultados geotécnicos y las características geológicas y petrográficas estudiadas en áridos de la provincia de Buenos Aires (Argentina). Las muestras provienen de las principales canteras productoras de áridos de las Sierras Septentrionales, en las proximidades de las ciudades de Olavarria y Tandil. Las observaciones indican que los resultados geotécnicos dependen no sólo de la mineralogía de la roca, sino que también es de suma importancia su textura, la cual está directamente vinculada con su origen geológico. Por otra parte se estima que las tecnologías de trituración empleadas en las plantas, deben adecuarse a las características mencionadas de la roca para potenciar sus propiedades y obtener agregados que cumplan con las necesidades del mercado.ln this paper are presented the relationships found between first geotechnical results and geologic and petrography characteristics studied in aggregates of Buenos Aires province (Argentina). Samples are coming from main aggregates quarries of Sierras Septentrionales near Olavarria and Tandil city. The observations indícate that geotechnical results are not only dependent on the mineralogy of the rock, but also it performs supreme importance its texture, which is directly linked by the geológica! origin. On the other hand is estimated that crushing technology used at cracking plants must be adapted to the characteristics mentioned of the rock to promote their properties and to obtained aggregates which expire with the needs of the market

Ovarian Steroids in Uterine Lumen and in Follicular Fluid

162 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1976.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD

Insights on the phylogeny of phytoplankton-bacteria associations

Second EMBO Conference on Aquatic Microbial Ecology - SAME-14, 23-28 August 2015, UppsalaPeer Reviewe

Bacterioplankton niche partitioning in the use of phytoplankton-derived dissolved organic carbon: Quantity is more important than quality

Some prokaryotes are known to be specialized in the use of phytoplankton-derived dissolved organic carbon (DOCp) originated by exudation or cell lysis; however, direct quantification measurements are extremely rare. Several studies have described bacterial selectivity based on DOCp quality, but very few have focused on the quantity of DOCp, and the relative importance of each of these variables (for example, quantity versus quality) on prokaryote responses. We applied an adapted version of the MAR-FISH (microautoradiography coupled with catalyzed reporter deposition fluorescence in situ hybridization) protocol using radiolabelled exudates from axenic algal cultures to calculate a specialization index (d') for large bacterioplankton phylogenetic groups using DOCp from different phytoplankton species and at different concentrations to elucidate to what extent the bacterial response to DOCp is driven by resource quantity (different DOCp concentrations) or by quality (DOCp from different phytoplankton species). All bacterial phylogenetic groups studied had lower d' at higher DOCp concentration, indicating more generalist behavior at higher resource availabilities. Indeed, at increasing resource concentrations, most bacterial groups incorporated DOCp indiscriminately, regardless of its origin (or quality). At low resource concentrations, only some specialists were able to actively incorporate the various types of organic matter effectively. The variability of bacterial responses to different treatments was systematically higher at varying concentrations than at varying DOCp types, suggesting that, at least for this range of concentrations (10-100 μM), DOCp quantity affects bacterial responses more than quality does. Therefore, resource quantity may be more relevant than resource quality in the bacterial responses to DOCp and affect how bacterioplankton use phytoplankton-derived carbon. © 2016 International Society for Microbial Ecology All rights reserved