A device for collecting particles and microorganisms present in ambient air, the device comprising means for sucking air into a small volume enclosure in which the particles and microorganisms are separated from the sucked-in air by centrifuging, the device being portable, self-contained, and capable of being handled in one hand only, e. A transparent horizontally loading folded sheet protector, with a \xbd\u2033 ring retaining extension on the right edge of the back panel, was designed to mount onto the rings of this binder. The list of preferred mobile access networks for selection is determined in accordance with operator determined conditions. Another preferred device is deployed in the left ventricular outflow tract at a location adjacent the aortic valve. The plunger is slidable along an inner surface of the stator core. One configuration includes an alternating mix of full length and partial plies, in order to provide the total thickness needed for the axial overlap.