Detection of Tsh protein mucinolytic activity by SDS-PAGE.

The temperature-sensitive hemagglutinin (Tsh, 140 kDa) produced by Escherichia coli is cleaved into a fragment (106 kDa) containing mucinase activity, and an agglutinin fragment (33 kDa). By incorporating mucins into SDS-PAGE gels stained by Schiff's periodic acid, we could simultaneously detect about 0.5 microg of mucinase activity and the fragment molecular mass.

Virulence-associated genes in Escherichia coli isolates from poultry with colibacillosis: correction.

Several virulence genes of avian Escherichia coli were detected in 200 colibacillosis isolates from our region by PCR. However, the genes sfaDE and facA were not detected in that study. In this work we correct those data, showing by colony hybridization that sfaDE and facA are present in 40% and 30% of those isolates, respectively.

Virulence-associated genes in Escherichia coli isolates from poultry with colibacillosis.

Avian pathogenic Escherichia coli, the causative agent of colibacillosis, harbors several putative virulence genes. In this study we examined by polymerase chain reaction (PCR) the presence of 16 of those genes in 200 colibacillosis isolates from our region. The seven virulence genes iutA, iss, cvaC, tsh, papC, papG and felA were detected significantly more often amongst colibacillosis isolates than in fecal isolates from healthy birds, thereby confirming their worldwide occurrence and possible pathogenic role in colibacillosis.

Occurrence of the temperature-sensitive hemagglutinin among avian Escherichia coli.

In this study, we determined the occurrence of the tsh gene among 305 Escherichia coli isolates from chickens by means of the polymerase chain reaction and agglutination of chicken erythrocytes; 200 of those isolates were obtained from chickens with colisepticemia, 52 isolates were from lesions of cellulitis, and 53 were from feces of normal chickens. The tsh gene was found in 79 (39.5%) isolates from colisepticemia, in 10 (19%) cellulitis-derived E.

Clearance of manganese from the rat substantia nigra following intra-nigral microinjections.

Chronic exposure to manganese (Mn) positively correlates with the occurrence of Parkinsonism but little is known about mechanisms of its neurotoxicity. In the present study, we determined the clearance of Mn from rat substantia nigra after its nigral injection and correlated it with the establishment of apomorphine-induced rotational behaviour and loss of striatal tyrosine hydroxylase (TH) immunoreactivity. Our results suggest that Mn is slowly cleared from the substantia nigra, following a first-order kinetics with a t(1/2) of 3 days.