A bovine strain of Pasteurella multocida was found to produce a beta-lactamase. The minimal inhibitory concentrations of amoxicillin (128 mg/l) and ticarcillin (512 mg/l) were high for this strain. The enzyme was periplasmic and produced constitutively, and there was no obvious permeability barrier. This enzyme had a TEM-substrate profile, and no inhibition was detected with antisera (anti-TEM-1, anti-TEM-2). The apparent isoelectric point was estimated at 8.8.

Amoxicillin↗

PubMedDate not supplied

Optimization of contrast-enhanced MR angiography of the hands with a timing bolus and elliptically reordered 3D pulse sequence.

Our objective was to optimize bolus administration and sequence setting in gadolinium-enhanced magnetic resonance (MR) angiography of the hands. Elliptically reordered three-dimensional (3D) spoiled gradient-echo sequence with non-slab-selective radio frequency excitation was optimized according to the measurements of arterial and venous time-signal curves in 21 patients. Great variations in bolus arrival time and arterio-venous transit time could be observed. In most patients high-quality arterial depiction could be obtained with minor venous contamination. Contrast-to-noise, spatial resolution, and selective arterial filling is still a challenge for 3D MR angiography of the hand but can be optimized using Gadolinium-BOPTA and a dedicated pulse sequence setting with exact bolus timing.

Adolescent↗

PubMedDate not supplied

Working on family trees: a form of resident therapy.

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Genealogy and Heraldry↗

PubMedDate not supplied

Don't be afraid of children's projects.

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Aged↗

PubMedDate not supplied

Characterization of infectious bronchitis viruses isolated from outbreaks of disease in commercial flocks in Brazil.

Fifteen isolations of infectious bronchitis (IB) virus were made from a total of 126 Brazilian poultry flocks of all ages that were examined. These flocks (14 chicken and 1 quail) were experiencing a variety of IB-like conditions including respiratory disease, digestive and kidney problems, and drops in egg production. One of the isolates was of the Massachusetts serotype. The remainder were examined by means of cross-neutralization tests in tracheal organ cultures and were shown to belong to at least four antigenic groups, all different from ones described previously in other countries. Some, but not all, of the flocks from which they were isolated had been vaccinated against IB with vaccines of the Massachusetts serotype. In vivo protection studies showed that the MA5 vaccine (of the Massachusetts serotype) protected well against challenge with four of these isolates, representing the different serotypes reported in this study.

Animals↗

PubMedDate not supplied

Images in clinical radiology. Small bowel adenocarcinoma in a 28-year-old patient.

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Adenocarcinoma↗

PubMedDate not supplied

[Severe complications following intermittent administration of rifampicin].

In the last two years the authors have noted the cases of five patients with pulmonary tuberculosis to which intermittent treatment with Rifampicin was administered (twice weekly, 600-900 mg/day), in association with Ethambutol. Between 2 and 6 months after the treatment was started, 24-72 hours after the last administration of Rifampicin acute renal failure developed in all five cases. Two of the patients also had signs of liver failure (increased serum transaminase, lowered pseudo-cholinesterase, increased BSP retention), and in one of them there was also a hematological syndrome consisting in hemolytic anemia and thrombocytopenia. Four of the patients benefited from application of diuretics, hydroelectrolytic re-equilibration and/or hemodialysis. One of the subjects died 12 hours after being hospitalized, with acute pulmonary oedema, refractory to treatment. From the histopathological viewpoint glomerular lesions were found in the kidney (non-uniform thickening of the basal membranes by PAS-positive deposits). In two of the patients various immunological tests have been carried out (Coombs test, lymphocyte-migration inhibition, serum and urine immunelectrophoresis) that, by their alterations, provide some elements indicating the immunological origin of the phenomena.

Acute Kidney Injury↗

PubMedDate not supplied

[Ankylosing spondylarthritis and partial cauda equina syndrome. Apropos of 4 cases and review of the literature].

Four new cases of ankylosing spondylitis complicated by a cauda equina syndrome are reported. Similarly to the previous descriptions, the patients present with long-standing and severe spondylitis at the time when neurological symptoms, mainly radicular pain, develop. Computed tomography of the lumbar spine demonstrates in all cases typical laminar erosions and posterior arachnoid diverticula. Up to now, magnetic resonance imaging has rarely been performed in this particular pathology, though it is helpful in determining the anatomical relations and the nature of the lesions. Based on the previous publications, our study aims at describing the clinical and pathogenic aspects of the disease and defining the most useful diagnostic investigations and treatment choices. Therapeutic possibilities are often limited because of a late diagnosis. Better knowledge of this rare complication could lead to earlier recognition and more efficient therapy.

Aged↗

PubMedDate not supplied

[Primary ulcer of the small intestine. The value of peroperative endoscopy].

A case of primary non-specific small bowel ulceration in a 39-year-old man is reported. Because of massive bleeding, an exploratory laparotomy was performed and the jejunal ulcer was discovered by fiberoptic endoscopy through a small jejunal enterotomy. The authors review the literature about the incidence, the diagnostic approach, the pathology, the aetiopathogenesis and treatment of this rare disease.

Adult↗

PubMedDate not supplied

Immunological comparison of constitutive beta-lactamases of gram-negative bacteria by neutralization in zymogram gels: properties of anti-TEM-1 and anti-TEM-2 sera.

The zymogram technique was applied to a beta-lactamase neutralization assay with anti-TEM-1 and anti-TEM-2 sera. Both were shown to contain neutralizing antibodies directed towards various beta-lactamases of Gram-negative bacteria. The quantitative neutralization allowed classification into five groups of the 28 beta-lactamases used as standards and 61 from clinical isolates. In the first were enzymes such as TEM-1 and TEM-2 including TLE-1, SHV-1, SHV-2, penicillinases of Klebsiella pneumoniae and CTX-1. Partial neutralization distinguished two groups containing the CARB group of enzymes, which are different from PSE-2 and PSE-3, and the MAL penicillinases of Levinea malonatica, which are different from L. amalonatica enzymes. Broad spectrum beta-lactamases of K. oxytoca constituted a unique group of partially neutralized enzymes. Among the beta-lactamases not neutralized by either serum were the plasmid-mediated OXA-enzymes, various species-specific beta-lactamases and cephalosporinases. The antigenic similarities of the enzymes appeared to correlate with the extent of similarities of their catalytic properties, namely those of penicillinases. Such comparisons between the beta-lactamase groups provide an indirect approach to the physiological and structural analysis of established and recently evolved beta-lactamases.

Epitopes↗

PubMedDate not supplied

[Beta-lactamases of ampicillin-resistant Salmonella].

One hundred and five strains of Salmonella, including 103 clinical isolates, were examined for resistance to beta-lactams (ampicillin, carbenicillin). The resistance frequency was 5.9 and 40.6%, respectively, according to the geographical source: France or Senegal. The mechanism of resistance to beta-lactam antibiotics was always related to the biosynthesis of one constitutive beta-lactamase (beta la+). By analytical isoelectric focusing on gel of all crude sonic extracts, four types of enzymes were identified: TEM-1, TEM-2, OXA-1 and SHV -1. TEM-1, the most prevalent, was observed among 17 serotypes, TEM-2 among 3 including S. poona , and OXA-1 among 2 serotypes. SHV -1 was detected in all isolates of S. ordonez (38) but only among strains of this serotype. Among others factors involved in their distribution, differences were reported according to the geographical origin of the studied strains. In France, the three types, TEM-1, TEM-2 and OXA-1, were isolated only in the north. Moreover, the resistance frequency was 4-fold higher (7.3%) than in the south (1.8%). In Africa (Senegal), three types were individualized: TEM-1, TEM-2 and SHV -1. The SHV -1 type was only detected in clinical isolates of S. ordonez from Senegal, all of which were multi-resistant to other antibiotics (chloramphenicol, sulfonamides and tetracyclines).

Ampicillin↗

PubMedDate not supplied

[Rapid determination of the synergy of clavulanic acid and beta lactams by measuring the intracellular ATP by bioluminescence].

Twenty clinical isolates of ampicillin- and carbenicillin-resistant or susceptible (two strains) Gram-negative rods, producing at least one beta-lactamase, were examined for susceptibility to a combination of ampicillin or carbenicillin with clavulanic acid (enzymatic inhibitor). Synergy was evaluated by the reduction of the beta-lactam agar dilution MIC and by the measurement of intracellular AYP using firefly bioluminescence. The potentiation effect of clavulanic acid was variable, depending on resistance levels, species and types of beta-lactamase (TEM, SHV-1, CARB, OXA, MAL and Cpase). The synergy was significant, with 10 mg/l of inhibitor for all the strains producing TEM-1, TEM-2 and Carb-2 except for one strain of Serratia marcescens (TEM-2). The synergy was weak for Levinea strains (Citrobacter diversus biotype b), biosynthesizing specific penicillinases as MAL-1. No potentiation effect was observed for strains producing a cephalosporinase, such as Escherichia coli and Pseudomonas aeruginosa. This effect appeared to be variable for strains producing the oxacillin-hydrolysing enzyme (OXA-1), such as E. coli and P. aeruginosa. A positive correlation was clearly demonstrated between the MIC values and the intracellular ATP concentration in bacteria within 2 h. The opportunity of using the firefly assay for the rapid determination of synergy between beta-lactam antibiotics and clavulanic acid is discussed.

Adenosine Triphosphate↗