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Differential scanning calorimetry (DSC) thermograms of δ-mannitol, β-galactosidase, polyethylene oxide (PEO), polyvinyl alcohol (PVA), the physical mixture of the fiber components, and the ground electrospun PVA + PEO + mannitol + β-galactosidase (high-speed electrostatic spinning (HSES) fibers).
