PubMed:17889844 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/17889844","sourcedb":"PubMed","sourceid":"17889844","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/17889844","text":"Molecular imaging of single cellulose chains aligned on a highly oriented pyrolytic graphite surface.\nIndividual cellulose macromolecules were successfully visualized on a highly oriented pyrolytic graphite (HOPG) surface by tapping-mode atomic force microscopy under ambient condition. Monomolecular-level dispersion of cellulose chains was achieved through the momentary contact of dilute cellulose/cupri-ethylenediamine (Cu-ED) solution onto the HOPG substrate. Both concentrations of cellulose and Cu-ED provided critical impacts on the topographical images. Single cellulose chains with molecular height of ca. 0.55 nm could be observed under the optimal conditions, showing rigid molecular rods with a unique morphology of hexagonal regularity. It was strongly suggested that the cellulose chains were aligned along the HOPG crystal lattice through a specific attraction, possibly due to a CH-pi interaction between the axial plane of cellulose and the HOPG pi-conjugated system. These phenomena would imply the potential applications of an HOPG substrate for not only nano-level imaging, but also for molecular alignment of cellulose and other structural polysaccharides.","tracks":[{"project":"PubmedHPO","denotations":[{"id":"T1","span":{"begin":680,"end":685},"obj":"HP_0002063"}],"attributes":[{"subj":"T1","pred":"source","obj":"PubmedHPO"}]},{"project":"sentences","denotations":[{"id":"TextSentencer_T1","span":{"begin":0,"end":101},"obj":"Sentence"},{"id":"TextSentencer_T2","span":{"begin":102,"end":286},"obj":"Sentence"},{"id":"TextSentencer_T3","span":{"begin":287,"end":464},"obj":"Sentence"},{"id":"TextSentencer_T4","span":{"begin":465,"end":562},"obj":"Sentence"},{"id":"TextSentencer_T5","span":{"begin":563,"end":615},"obj":"Sentence"},{"id":"TextSentencer_T6","span":{"begin":616,"end":750},"obj":"Sentence"},{"id":"TextSentencer_T7","span":{"begin":751,"end":985},"obj":"Sentence"},{"id":"TextSentencer_T8","span":{"begin":986,"end":1178},"obj":"Sentence"},{"id":"T1","span":{"begin":0,"end":101},"obj":"Sentence"},{"id":"T2","span":{"begin":102,"end":286},"obj":"Sentence"},{"id":"T3","span":{"begin":287,"end":464},"obj":"Sentence"},{"id":"T4","span":{"begin":465,"end":562},"obj":"Sentence"},{"id":"T5","span":{"begin":563,"end":615},"obj":"Sentence"},{"id":"T6","span":{"begin":616,"end":750},"obj":"Sentence"},{"id":"T7","span":{"begin":751,"end":985},"obj":"Sentence"},{"id":"T8","span":{"begin":986,"end":1178},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"attributes":[{"subj":"TextSentencer_T1","pred":"source","obj":"sentences"},{"subj":"TextSentencer_T2","pred":"source","obj":"sentences"},{"subj":"TextSentencer_T3","pred":"source","obj":"sentences"},{"subj":"TextSentencer_T4","pred":"source","obj":"sentences"},{"subj":"TextSentencer_T5","pred":"source","obj":"sentences"},{"subj":"TextSentencer_T6","pred":"source","obj":"sentences"},{"subj":"TextSentencer_T7","pred":"source","obj":"sentences"},{"subj":"TextSentencer_T8","pred":"source","obj":"sentences"},{"subj":"T1","pred":"source","obj":"sentences"},{"subj":"T2","pred":"source","obj":"sentences"},{"subj":"T3","pred":"source","obj":"sentences"},{"subj":"T4","pred":"source","obj":"sentences"},{"subj":"T5","pred":"source","obj":"sentences"},{"subj":"T6","pred":"source","obj":"sentences"},{"subj":"T7","pred":"source","obj":"sentences"},{"subj":"T8","pred":"source","obj":"sentences"}]}],"config":{"attribute types":[{"pred":"source","value type":"selection","values":[{"id":"PubmedHPO","color":"#95ec93","default":true},{"id":"sentences","color":"#ec93af"}]}]}}