Remoción de cromo (VI) en solución acuosa por la biomasa modificada del grano de arroz (Oriza sativa L.) Chromium (VI) removal in aqueous solution by the modified biomass of rice grain (Oriza sativa L.
ResumenSe aislaron diferentes microorganismos de varios ríos de la Huasteca Potosina en México, los cuales crecen en presencia de petróleo como única fuente de carbono. Se determinó la actividad de alcohol oxidasa por un método colorimétrico. La bacteria más frecuentemente encontrada fue Pseudomonas aeruginosa (50%) y se encontró solamente una levadura, Candida albicans (6.25%). Además, presentan buena actividad de alcohol oxidasa en la fracción citosólica con diferentes sustratos. Se concluye que estos microorganismos pueden ser utilizados para la eliminación y degradación de petróleo en sitios contaminados.
Palabras clave: microorganismos, bacterias, contaminación por petróleo, Candida albicans, alcohol oxidasa
Isolation and Identification of Petroleum Resistant Bacteria and Yeast AbstractDifferent microorganisms were isolated from various rivers of the Huasteca Potosina, in Mexico that grow in the presence of petroleum as the sole carbon source. The activity of alcohol oxidase was determined by a colorimetric method. The most common bacteria present in the samples were Pseudomonas aeruginosa (50%) and only one type of yeast was found, Candida albicans (6.25%). Furthermore, they show good activity of alcohol oxidase in the cytosolic fraction with different substrates. It was concluded that this microorganisms could be used for decontamination of aquatic habitats polluted with petroleum.
We characterized an outbreak of imipenem-resistant Acinetobacter baumannii with clinical and environmental isolates from a tertiary care hospital in San Luis Potosi, Mexico. During a 4-month period, a total of 32 nonrepetitive imipenem-resistant clinical isolates of A. baumannii were collected. All isolates were susceptible to colistin and tigecycline and resistant to cefepime, ceftazidime, ceftriaxone, imipenem, and meropenem. Genotyping by pulsed-field gel electrophoresis showed a major clone (A). Multilocus sequence type (MLST) analysis was performed, revealing sequence type (ST) 417 (ST417) and 208 (ST208). The bla IMP-, bla VIM-, bla GIM-, bla SIM-, bla NDM-type , and bla OXA-type (bla OXA-23-like , bla OXA-24-like , bla OXA-51-like , and bla OXA-58-like ) genes were screened and showed that the bla OXA-51-like and bla OXA-24-like genes were present in all isolates. Sequencing and southern hybridization were performed, confirming the presence of the bla OXA-72 gene and its plasmid-borne nature. In addition, the bla OXA-72 -XerC/XerD-like association was identified. These findings indicate that a clonal spread of bla OXA-72 -producing A. baumannii ST417 had occurred throughout the hospital. The ST417 corresponded with a previous ST described in the United States.
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