Fluoropolymers including polytetrafluorethylene (PTFE) are used extensively in propulsion assembly due to their reputation for chemical inertness, but as newer propellants emerge in modern propulsion systems, such as nitrous oxide (N 2 O), the effects on seal performance and compatibility must be carefully studied
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doi: 10.1080/14740338.2023.2295397
Aib mimics the structure of d-amino acids, which considerably increases resistance against protease enzymes such as DPP-IV, leading to an extended half-life of up to 5 days
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A side-by-side comparison table is helpful to use as a decision-making tool to weigh long-term retention, integration, complication rates, materials, cell sources, and manufacturing methods