58 research outputs found
Virulence factors and drug resistance in Escherichia coli isolated from extraintestinal infections
Purpose: To determine the virulence factors produced by Escherichia
coli isolated from extraintestinal infections, to study the drug
resistance pattern in E. coli with special reference to extended
spectrum β -lactamase (ESBL) and to evaluate screening methods for
ESBL. Methods: A total of 152 isolates of E. coli from various
extraintestinal infections were screened for virulence factors such as
haemolysin, surface hydrophobicity, serum resistance and protease. All
the isolates were also studied for antibiotic susceptibility pattern
using modified Kirby Bauer disk diffusion method. ESBL production was
screened by standard disk diffusion method and confirmed using
phenotypic confirmatory method. Results: Among 152 isolates, 36
(23.7%) were haemolytic, 42 (27.6%) were hydrophobic, 132 (86.8%) were
serum resistant and only four were positive for protease. Multiple
virulence factor were observed in 67 (44%) of isolates. Seventy-nine
(51.4%) isolates produced ESBL. ESBL producing isolates showed
multidrug resistance. There was a significant association ( P <
0.001) between multiple virulence factors and ESBL production by
extraintestinal E. coli . Conclusions: The present study shows the
expression of virulence factors and multidrug resistance in E. coli
isolated from various extraintestinal infections. The study also shows
that appropriate methods of detecting drug resistance and ESBL
production are required for the judicious use of antibiotics in
managing these infections
CRYSTAL FIELD AND MAGNETIC PROPERTIES OF Dy(OH)
The electric quadrupole and magnetic hyperfine interactions rneasured from the 161Dy Mössbauer
resonance in crystalline Dy(OH)3 and from the 166Er resonance in crystalline Ho(OH)3 and Er(OH)3
are interpreted using the crystal field and molecular exchange field model . The crystal field parameters
established from previous optical spectroscopy results account weIl for these hyperfine parameters.
The crystal-field and magnetic properties of these ferromagnetic insulators are described
weIl within the model
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Characteristics of the 7-GeV advanced photon source: A guide for users
In this document we present the characteristics of the electromagnetic radiation from various types of sources on the 7-GeV Advanced Photon Source (APS) storage ring. The sources include bending magnets, undulators, and wigglers. The characteristics are compared with those of other synchrotron sources when operated at their design specifications. The influence of positron beam size on the on-axis brilliance is discussed, along with the power distribution from these sources. The goal of this document is to provide users with enough information on the characteristics of radiation from the APS storage ring so that experiments can be efficiently planned. 23 refs., 20 figs., 8 tabs
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