ß-Lactams are the most widely used antibiotics, and ß-lactamases are the greatest source of resistance to them. Colorimetric tests are good, rapid, indicators of ß-lactamase production and its contingent resistance in Haemophilus, Moraxella and Neisseria spp. They can also be applied to Gram-negative bacilli but are less useful, since the usual question is not whether a ß-lactamase is produced ...

The aim of this study was to investigate the pathogenic potential and antibiotic resistance 59 Escherichia coli isolates from ready-to-eat (RTE) street food (n = 31) drinking water 28) sold in city Maputo, Mozambique. were characterized by XbaI subtyping analysis via pulsed field gel electrophoresis. Multiplex PCRs performed targeting five virulence genes (stx, lt, st, astA, eae) three groups a...

The electron spin resonance (ESR) spectra of 15NOand 14NO-ligated Hb Kansas have been measured at 77 K in the range of pH 5 to 10. At low pH the ESR spectrum is the composite of a type I and a type II spectrum which changes to another composite of a type I and type II spec­ trum at high pH. For the definition of type I and type II spectra and the correlation of these types with two tertiary con...

The role of Aeromonas spp. in a variety of human illnesses has been well documented during the last decades. The spectrum of infectious diseases caused by Aeromonas species includes gastrointestinal and extraintestinal infections. Aeromonas gastrointestinal infections are generally self-limiting and antibiotic therapy is unnecessary. However, for gastrointestinal infections in immunocompromised...

64 Rev Esp Quimioter 2010;23(2):100-102 The class B metallo carbapenem-hydrolyzing ß lactamases (MBLs) are enzymes of great concern because they possess activity against all ß -lactams, except monobactams. Up to now, several members of this family of enzymes have been described (IMP, VIM, SPM-1, GIM-1, SIM-1). Most of VIM and IMP genes usually reside within class 1 integrons as gene cassettes. ...

When the sub-core complex of photosystem II, D1/D2, is irradiated at 436 or 415 nm (absorption by chlorophyll and pheophytin and ß-carotene) or 540 nm (absorption primarily by pheophytin), the low temperature fluorescence spectrum has two maxima, at 685 and 674 nm. This shows the existence of at least two different fluorescent forms of chlorophyll (chlorophyll a and perhaps pheophytin a). When ...

Objective: In this work we report the molecular characterization of ß-lactam antibiotics resistance conferred by genes contained in plasmids from enterobacteria producing extended-spectrum ß-lactamases (ESBL). Material and Methods: Fourteen enterobacterial clinical isolates selected from a group of strains obtained from seven different hospitals in Mexico during 1990-1992 and 1996-1998 were ana...

22 Resistance to ß-lactams is constantly increasing, due to the emergence of totally new 23 enzymes, but also to the evolution of pre-existing ß-lactamases. GES-1 is a clinically24 relevant extended-spectrum -lactamase (ESBL) hydrolyzing penicillins and broad25 spectrum cephalosporins, but sparing monobactams and carbapenems. However, 26 several GES-1 variants (i.e. GES-2 and GES-5) previously ...