Características de la liberación de energía en una fulguración, determinadas de observaciones en rayos X y en radio

Usando los datos de rayos X (3.5-30 keV) del Hard X-ray Imaging Spectrometer (HXIS) del satélite Solar Maximum Mission (SMM), se han estudiado los aspectos morfológicos y la evolución temporal de tres fulguraciones solares de importancia del 29 de junio de 1980. Los eventos se produjeron a las 02:35, 10:40 y 18:22 TU, fue analizado en detalle, incluyendo le estudio del flujo total de rayos X duros (> 30 keV) del Hard X-ray Burst Spectrometer (HXRBS) del SMM y los datos en longitud de onda métrica del radioeliografo de Nancay.Asociación Argentina de Astronomí

Evaluation of antibiotics as a methodological procedure to inhibit free-living and biofilm bacteria in marine zooplankton culture

There is a problem with keeping culture medium completely or partially free from bacteria. The use of prokaryotic metabolic inhibitors, such as antibiotics, is suggested as an alternative solution, although such substances should not harm non-target organisms. Thus, the aim of this study was to assess the effectiveness of antibiotic treatments in inhibiting free-living and biofilm bacteria and their half-life in artificial marine environment using the copepod Acartia tonsa as bioindicador of non-harmful antibiotic combinations. Regarding to results, the application of 0.025 g L-1 penicillin G potassium + 0.08 g L-1 streptomycin sulphate + 0.04 g L-1 neomycin sulphate showed great potential for use in marine cultures and scientific experiments without lethal effects to non-target organisms. The effect of this combination starts within the first six hours of exposure and reduces up to 93 % the bacterial density, but the half-life is short, requiring replacement. No adverse changes in water quality were observed within 168 hours of exposure. As a conclusion, we can infer that this treatment was an effective procedure for zooplankton cultures and scientific experiments with the aim of measuring the role of free-living and biofilm in the marine community