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polymer science and technology catalysis physical chemistry catalyst acid-base catalysis heterogeneous catalysis homogeneous catalysis enzyme catalysis current meter flow measuring instruments pitot tube introduction to fluid flow boiling regimes of boiling heat transfer phase change heat transfer condensation polystyrene plastics high impact polystyrene silk spider silk mechanical properties of silk degradation of silk structure of silk immunological response proteins natural polymer ultimate tensile machine thermogravimetry analysis scanning electron microscope