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In order to create active noise canceling headphones, a pair of Sennheiser HD 202 headphones was modified with microphones and a series of op-amp circuits. Attenuation of low frequency ambient noise was successfully observed.
The pathway of production, secretion, and extracellular deposition of type I collagen and osteonectin was studied by immunoelectron microscopy using respective polyclonal antibodies. Protein A gold and immunogold methods yielded to similar results in human callus tissue used as a model of bone formation. The intracellular distribution of osteonectin in… (More)