The order of 32 fold enhancement of antigen detection in the USSW system extends analytical capability to cover the antigen levels in the serum from most presenting patients. The USSW technique is specific, simple and rapid. Serogroup results with both methods were concordant. A force field ultrasonic filter for analytical environmental sample clarification. Environmental water samples, and analytical samples in a more general way, can benefit from the presence of an on-line particle prefilter e.g. when analysis is based on optical techniques.
Solid filters block with time.
Ultrasound, operating in the force field mode, now offers a viable alternative to solid phase filtration. When a suspension flows at the rate of millilitres per min into the chamber cells such as yeast or erythrocytes concentrate rapidly on axis, as illustrated below. Clarified off-axis fluid exits to the analyser from the side outlets. A numerical model that combines the influences of laminar flow and the USSW field on particle trajectories in the filter has been successfully developed. Plasma preparation from whole blood by a USSW Cells in highly concentrated suspensions, as in whole blood, rapidly attenuate ultrasound so that particle concentration and sedimentation in a USSW can be difficult.