PubMed:1797401 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/1797401","sourcedb":"PubMed","sourceid":"1797401","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/1797401","text":"13C-n.m.r. studies of the acetylation sequences in partially N-deacetylated chitins (chitosans).\nChitosans obtained under homogeneous conditions of N-deacetylation, with degrees of N-deacetylation between 46% and 94%, were depolymerised and their 125-MHz 13C-n.m.r. spectra have been interpreted. The sequence of 2-acetamido-2-deoxy-beta-D-glucopyranose (GlcNAc) and 2-amino-2-deoxy-beta-D-glucopyranose (GlcN) residues influenced the chemical shifts, and the diad and triad frequencies have been calculated. Chitosans that were N-deacetylated under homogeneous and heterogeneous conditions gave values for the diad and triad frequencies that were consistent with a random arrangement of GlcN and GlcNAc residues.","tracks":[{"project":"sentences","denotations":[{"id":"TextSentencer_T1","span":{"begin":0,"end":96},"obj":"Sentence"},{"id":"TextSentencer_T2","span":{"begin":97,"end":296},"obj":"Sentence"},{"id":"TextSentencer_T3","span":{"begin":297,"end":508},"obj":"Sentence"},{"id":"TextSentencer_T4","span":{"begin":509,"end":713},"obj":"Sentence"},{"id":"T1","span":{"begin":0,"end":96},"obj":"Sentence"},{"id":"T2","span":{"begin":97,"end":296},"obj":"Sentence"},{"id":"T3","span":{"begin":297,"end":508},"obj":"Sentence"},{"id":"T4","span":{"begin":509,"end":713},"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":"T1","pred":"source","obj":"sentences"},{"subj":"T2","pred":"source","obj":"sentences"},{"subj":"T3","pred":"source","obj":"sentences"},{"subj":"T4","pred":"source","obj":"sentences"}]},{"project":"NGLY1-deficiency","denotations":[{"id":"PD-NGLY1-deficiency-B_T1","span":{"begin":355,"end":361},"obj":"chem:24139"},{"id":"PD-NGLY1-deficiency-B_T2","span":{"begin":697,"end":703},"obj":"chem:24139"}],"namespaces":[{"prefix":"hgnc","uri":"https://www.genenames.org/data/gene-symbol-report/#!/hgnc_id/HGNC:"},{"prefix":"omim","uri":"https://www.omim.org/entry/"},{"prefix":"chem","uri":"https://pubchem.ncbi.nlm.nih.gov/compound/"}],"attributes":[{"subj":"PD-NGLY1-deficiency-B_T1","pred":"source","obj":"NGLY1-deficiency"},{"subj":"PD-NGLY1-deficiency-B_T2","pred":"source","obj":"NGLY1-deficiency"}]}],"config":{"attribute types":[{"pred":"source","value type":"selection","values":[{"id":"sentences","color":"#93e7ec","default":true},{"id":"NGLY1-deficiency","color":"#ecd693"}]}]}}