Abstract: An apparatus and method are provided for preparing specimens of biological cells uniformly distributed over a substrate surface. The method comprises providing a suspension of biological cells in fluid, and then extracting biological target cells from the suspension to leave debris and contaminants behind. The extracted target cells are distributed over a substrate surface into a primary layer of cells coupled to the substrate surface with the remaining cells forming a secondary layer on top of the primary layer. The target cells forming the secondary layer are then removed to produce a substantially non-overlapping layer of target cells coupled to the substrate surface.

Abstract: A pack convertible to a pannier for bicycling and a backpack for hiking. The pack comprises a multiple compartment travel bag. The compartments are attached to a hinged back member. The pack includes a pair of shoulder straps and a waist belt for carrying the pack as a backpack and fastening straps for converting the pack to a backpack. In pannier mode, the hinged back member allows the compartments to attach to each side of a pannier rack and the fastening straps are connected to the shoulder straps to secure the straps out of the way. To convert to a backpack, the fastening straps are cinched together to straighten the back member. When converted to a backpack, the back member forms an internal frame to assist in supporting the load carried by the hiker.backslash.cyclist.