Competition structures ecological communities and alters host-pathogen interactions. In environmentally transmitted pathogens, an infection-resistant competitor may influence infection dynamics in a susceptible species through the negative impacts of competition (e.g., by reducing host density or causing nutritional stress that increases susceptibility to infection) and/or the positive impacts ...

Theoretical models suggest that overlapping generations, in combination with a temporally fluctuating environment, may allow the persistence of competitors that otherwise would not coexist. Despite extensive theoretical development, this "storage effect" hypothesis has received little empirical attention. Herein I present the first explicit mathematical analysis of the contribution of the stora...

Laboratory experiments identified microviridin J as the source of a fatal molting disruption in Daphnia species organisms feeding on Microcystis cells. The molting disruption was presumably linked to the inhibitory effect of microviridin J on daphnid proteases, suggesting that hundreds of further cyanobacterial protease inhibitors must be considered potentially toxic to zooplankton.

three extracts of pulicaria dysenterica were examined for antibacterial activity using the agar disk-diffusion method against six bacterial strains. some of these extracts were found to be active against some bacterial strains. the methanolic extract exhibited a superior level of antibacterial activity. all of the extracts were active against vibrio chlorea.

Se registra por primera vez a la especie invasora Tarentola mauritanica para provincia de Neuquén. Esta originaria África, posee una alta capacidad adaptación ambientes antrópicos, lo que su distribución es amplia, encontrándose en varios países América, incluyendo Argentina. En nuestro país está citada Buenos Aires, Salta, Tucumán y este nuevo registro

Medicinal plants are highly valued for their active compounds. These can be used in various fields and preservation of these environment. The present study aimed to screen medicinal traditional medicine Medina valleys the presence metabolites, answer following question: is ethnomedicinal importance conform primary secondary metabolite content. Eight (Pulicaria incise, Heliotropium arbainense, C...