1,155 research outputs found
Trapping of dielectric particles with light-induced space-charge fields
Light-induced space-charge fields in lithium niobate crystals are used to trap and manipulate dielectric particles on the surface of such crystals. Without any external voltage source, strong field gradients are present in the proximity of the crystal surface. These are used to trap particles with diameters in the range between 100 nm and some tens of micrometers
Subtropical coral reveals abrupt early 20th century freshening in the western North Pacific Ocean
Use of recombinant ApxIV in serodiagnosis of Actinobacillus pleuropneumoniae infections and development of an ApxIV ELISA
Actinobacillus pleuropneumoniae (App) is the etiological agent of porcine pleuropneumonia. The virulence of the fifteen serotypes of App is mainly determined by the three major RTX toxins ApxI, ApxII and ApxIII, which are secreted by the different serotypes in various combinations. A fourth RTX toxin, ApxIV, is produced by all 15 serotypes specifically during infection of pigs, but not under in vitro conditions. Pigs infected with App show specific antibodies directed against ApxIV. The analysis of sera of experimentally infected pigs revealed that ApxIV-immunoblots detected App infections in the second to third week post infection. We developed an indirect ELISA based on purified recombinant N’-terminal moiety of ApxIV that showed a specificity of 100% and a sensitivity of 93.8%
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