Ciencias del Mar

The response of the microphytoplanktonic community to the physical and chemical changes during an upwelling event is analyzed on a daily scale. The study coincided with the "El Niño" 1997-1998 presence, but the results did not show the anomalous condition associated with this event. The Upwelling Index values allowed us to divide the study period in two phases, the first

The antimicrobial resistance is coded in genetic elements which generate a horizontal flow of information, particularly in conditions that are under strong selective pressure like the nosocomial environment. In that sense, in the last decades, gram negative bacilli have become important agents of nosocomial infection. In order to investigate the presence of integrons among clinical isolates of gram negative bacilli and their relationship with their resistance profile, we studied 88 strains isolated from clinical specimens of different wards of the Hospital Torres Galdames, during the June-December period, 2004. They were identified according to biochemical tests. The antimicrobial susceptibility was evaluated by agar diffusion method. The integron presence was investigated by polymerase chain reaction (PCR). A cluster analysis was carried out to study the relationship between the presence of integrons and the resistance profile. The genotyping of the isolates was carried out by ERIC...

Se analiza la respuesta de la comunidad microfitoplanctonica a los cambios en la estructura fisica y quimica producidos por un evento de surgencia sobre una escala diaria. La epoca en la cual se realizo el estudio coincidio con la presencia de �El Nino� 1997-1998, pero los resultados no evidenciaron una condicion anomala asociada a dicho evento. Los valores del indice de surgencia permitieron dividir el periodo de estudio en dos fases, la primera, entre el 26 de agosto y el 7 de septiembre, cuando las magnitudes de los eventos estuvieron centradas en los 1.000 m3s-1, y la segunda entre el 9 y el 17 de septiembre, cuando los valores superaron los 2.000 m3s-1. La estructura comunitaria del microfitoplancton estuvo fuertemente acoplada a las fluctuaciones fisicas y quimicas ocasionadas por la variabilidad de los eventos de surgencia. Durante la primera fase hubo una predominancia absoluta de Thalassiosira subtilis (Ostenfeld) Gran emend. Hasle, la cual contribuyo con un 82,8% al total ...

Neisseria gonorrhoeae is a nonmotile, sporulated, aerobic or facultative anaerobic gram-negative diplococcus, catalase and oxidase positive. Sexually transmitted infections caused by this microorganism were established as public health problem since the 19th century, representing a great threat to human health due to its high prevalence and multi-resistance to antimicrobials. In recent decades, reports of strains resistant to penicillin, fluoroquinolones, sulfonamides, tetracycline, macrolides, and more recently to cephalosporins and azithromycin have increased. Such a panorama has generated concern worldwide, due to the increase in cases of gonorrhea associated with multi-resistant strains. In Chile, from 2010 to 2018, the National Surveillance Program for N. gonorrhoeae was developed in order to characterize this infection in the regions and record antimicrobial resistance. This review presents an updated, systematic bibliographic analysis of the main aspects of this microorganism, its response to antimicrobials, and provides diagnostic and treatment guidelines, while waiting to advance in the understanding of the molecular mechanism and the metabolic and immunological interactions that determine infection, with a view to designing an effective vaccine.