PubMed:17889844 JSONTXT

{"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#"}],"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."}

{"project":"PubmedHPO","denotations":[{"id":"T1","span":{"begin":680,"end":685},"obj":"HP_0002063"}],"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."}