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PubMed · 9478113

[Heparins and thrombocytes].

Z Krska
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Abstract

The author discusses problems of less well known and less frequent complications of preventive or curative heparin administration. Published findings pertaining to this problem are supplemented by the author's clinical experience. As regards the risk of heparin induced thrombocytopenia, administration of low molecular heparins involves a smaller risk.

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HeparinHumansThrombocytopeniaEnglish AbstractJournal Article

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Z Krska. 1997. [Heparins and thrombocytes].. https://pubmed.ncbi.nlm.nih.gov/9478113/

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Thermally reversible pluronic/heparin nanocapsules exhibiting 1000-fold volume transition.

Novel Pluronic/heparin composite nanocapsules that exhibit a thermally responsible swelling and deswelling behavior were synthesized. Pluronic F-127 preactivated with p-nitrophenyl chloroformate at its two terminal hydroxyl groups was dissolved in a methylene chloride phase. The organic phase was dispersed in an aqueous phase containing heparin. At an organic/aqueous interface, Pluronic-cross-linked heparin nanocapsules were produced. They exhibited a 1000-fold volume transition (ca. 336 nm at 25 degrees C; ca. 32 nm at 37 degrees C), and a reversible swelling and deswelling behavior when the temperature was cycled between 20 and 37 degrees C. The reversible volume transition of Pluronic nanocapsules was caused by micellization and demicellization of cross-linked Pluronic polymer chains within the nanocapsule structure in response to temperature. The morphological characters were investigated with transmission electron microscopy and small angle neutron scattering. Pluronic/heparin nanocapsules had an aqueous fluid-filled hollow interior with a surrounding shell layer below the critical temperature, but they became a collapsed core/shell structure similar to that of Pluronic micelles above it.

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