Abstract: Probes comprise S1 and P1 nuclease (as an enzyme label) linked to a specific binding member such as a nucleotide sequence or an antibody. Such probes are useful for sandwich assays. As compared with known probes using alkaline phosphatase as a label, advantages include relative insensitivity to phosphate and elevated temperature and reduced risk of nonspecific binding.

Abstract: Methods for fabricating nano-structured surfaces having geometries in which the passage of elementary particles through a potential barrier is enhanced are described. The methods use combinations of electron beam lithography, lift-off, and rolling, imprinting or stamping processes.

Abstract: Hydrolase enzymes are sensitively determined using novel substituted FAD substrates. The substituted FAD substrates are hydrolysed to FAD by the enzyme to be detected. The FAD is then combined with an apoenzyme to form a holoenzyme which is used to initiate a reaction that leads to a detectable product. When the hydrolase to be detected is phosphatase, the novel substrate is a phosphorylated derivative of FAD. A suitable apoenzyme is apo-glucose oxidase which provides exceptional sensitivity. Apo-D-amino acid oxidase, which is suitable for use in a "single pot" assay system, can also be used.