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Lymphocyte subsets in bronchoalveolar lavage after exposure to Actinobacillus pleuropneumoniae in pigs previously immunized orally or by aerosol (1995)

Pabst, R. ; Delventhal, S. ; Gebert, A. ; [et al.]

Springer

Lung 173 (1995), S. 233-241

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ISSN: 1432-1750

Keywords: Bronchoalveolar lavage ; Actinobacillus (Haemophilus) pleuropneumoniae ; Immunization ; Lymphocyte subsets ; Pig

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract Young pigs were immunized with the lung-pathogenic bacterium Actinobacillus (Haemophilus) pleuropneumoniae by aerosol or orally using viable and inactivated bacteria. The cellular changes in the bronchoalveolar lavage (BAL) were studied in repeated lavages after the pigs were infected with live bacteria. The nucleated cells in the BAL were differentiated and lymphocyte subsets determined. There were no major differences between the two routes of immunization or between viable and inactivated bacteria. The immunization induced an increase in all lymphocyte subsets studied and in the appearance of plasma cells and lymphoid blasts. The infection did not cause a further increase except in granulocytes. The lack of a booster-type increase in lymphocytes in the BAL might indicate a different immunologic reaction of the lung or that lymphocytes of the BAL do not represent lung lymphocytes in general. The protective effect of the immunization might be deduced from the increase in lymphocytes after immunization but not from the reaction pattern after infection.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00181875

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Electrochemical investigations on the bulk glass forming Zr55Cu30Al10Ni5 alloy (1997)

Gebert, A. ; Mummert, K. ; Eckert, J. ; [et al.]

Weinheim [u.a.] : Wiley-Blackwell

Materials and Corrosion/Werkstoffe und Korrosion 48 (1997), S. 293-297

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ISSN: 0947-5117

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Description / Table of Contents: Elektrochemische Untersuchungen an Massivproben der glasbildenden Zr55Cu30Al10Ni5-LegierungEs ist das elektrochemische Verhalten der amorphen Zr55Cu30Al10Ni5 Legierung, welche in Form zylindrischer massiver Proben mit einem Durchmesser von 7 mm hergestellt wurde, untersucht worden. Zyklische potentiodynamische Polarisationsmessungen, die an den Querschnittsflächen der Proben in luftgesättigten und stickstoffgespülten Sulfat- bzw. Hydroxidlösungen ausgeführt wurden, zeigen, daß die Legierung sehr schnell schützende Passivschichten mit geringer Elektronenleitfähigkeit bildet, die in einem weiten pH-Wert- und Potentialbereich stabil sind. Anodische Schichtbildungsreaktionen werden charakterisiert. In chloridhaltigen Elektrolyten besteht eine Lochkorrosionsanfälligkeit des massiven Materials. Die Wirkung kristalliner Defekte als aktive Plätze für die Initiierung von lokalen Korrosionsprozessen wird kritisch diskutiert.

Notes: The electrochemical behaviour of the Zr55Cu30Al10Ni5 amorphous alloy prepared as cylindrical bulk samples with 7 mm diameter has been investigated. Cyclic potentiodynamic polarization measurements carried out on the cross section areas of the samples in air-saturated and nitrogen-purged sulphate and hydroxide solutions, respectively, show that the alloy rapidly forms protective passive layers with low electron conductivity which are stable in a wide pH-value and potential range. Anodic layer formation reactions are characterized. In chloride containing electrolytes a pitting corrosion susceptibility of the bulk material exists. The effect of crystalline defects as active sites for the initiation of localized corrosion processes is critically discussed.

Additional Material: 8 Ill.