{"paper":{"title":"Manning free counterions fraction for a rod-like polyion - short DNA fragments in very low salt","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.soft","authors_text":"Damir Aumiler, Danijel Grgicin, Francoise Livolant, Joachim Raedler, Sanja Dolanski Babic, Silvia Tomic, Tomislav Vuletic","submitted_at":"2010-10-04T23:42:25Z","abstract_excerpt":"We quantified the Manning free (uncondensed) counterions fraction $\\theta$ for dilute solutions of rod-like polyions - 150bp DNA fragments, in very low salt $<0.05$mM. Conductivity measurements of aqueous DNA solutions in the concentration range $0.015\\leq c \\leq 8$~mM (bp) were complemented by fluorescence correlation spectroscopy (FCS) measurements of the DNA polyion diffusion coefficient $D_p(c)$. We observed a crossover in the normalized conductivity $\\sigma(c)/c$ which nearly halved across $c=0.05-1$ mM range, while $D_p(c)$ remained rather constant, as we established by FCS. Analyzing th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1010.0730","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}