tissue engineering polymer biomaterial scaffold material regenerative medicine electrospinning cloning transformation pcr hybridization dna and rna detection nucleic acid removal biopharmaceuticals voigt unit viscoelasticity psychorheology maxwell unit rheology oscillatory and creep methods cone and plate viscometer intensity distribution z-average size number distribution distribution polydispersity index volume distribution biocompatible polymer plga bulk erosion surface erosion biodegradable polymer process design solid dosage form pharmaceutical industry qbd scale-up
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