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What does NAS stand for?

NAS stands for NVP)/N-acryloxysuccinimide

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Elaboration of Densely Functionalized Polylactide Nanoparticles from N-Acryloxysuccinimide.
A simple approach has been developed to prepare conjugates between oligodeoxyribonucleotides (ODNs) and linear copolymers of N-vinylpyrrolidone (NVP)/N-acryloxysuccinimide (NAS). These conjugates were of higher than expected molecular weight, as determined by light scattering. Side reactions between amino groups on heterocyclic bases, especially of cytosine, are proposed to explain the formation of aggregates.
Glycopolymer-corona-based micelles are obtained in a one-pot procedure, through reaction of D-mannosamine or D-glucosamine with the N-succinimidyl (NS) esters of a poly(D,L-lactide)-block-poly(N-acryloxysuccinimide.
Well-defined poly(N-acryloxysuccinimide) (PNAS) and poly(N-acryloxysuccinimide-co-N-vinylpyrrolidone) (P(NAS-co-NVP)) were prepared by nitroxide-mediated polymerization in N,N-dimethylformamide in the presence of free SG1 with MAMA-SG1 alkoxyamine (BlocBuilder) as initiator. The reactivity ratios of NAS and NVP were determined to be rNAS = 0. 12 and rNVP = 0, indicating a strong alternating tendency for the obtained copolymer.
We report a one-pot synthesis of well-defined micron-sized or nanoscale poly(N-acryloxysuccinimide-co-N-vinylpyrrolidone) particles. We show that these pre-activated particles can be easily coupled to an amine-functionalized cargo in a single step to generate particles with uniform fluorescence.
Glycopolymer-corona-based micelles are obtained in a one-pot procedure, through reaction of D-mannosamine or D-glucosamine with the N-succinimidyl (NS) esters of a poly(D,L-lactide)-block-poly(N-acryloxysuccinimide.