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The effects of hydration, relaxation time and crystallinity were systematically investigated. It is concluded that low signal\u2010to\u2010noise ratios are the result of the typically low density of protein preparations and not an intrinsic magnetic resonance phenomenon, and that line broadening is principally the result of poor molecular packing in noncrystalline protein preparations.<\/jats:p>","DOI":"10.1002\/mrc.1260311109","type":"journal-article","created":{"date-parts":[[2005,5,28]],"date-time":"2005-05-28T18:47:58Z","timestamp":1117306078000},"page":"1001-1007","source":"Crossref","is-referenced-by-count":7,"title":["Factors affecting the line widths and signal\u2010to\u2010noise ratios of the <sup>13<\/sup>C CP\/MAS spectra of proteins"],"prefix":"10.1002","volume":"31","author":[{"given":"Peter S.","family":"Belton","sequence":"first","affiliation":[]},{"given":"Ana M.","family":"Gil","sequence":"additional","affiliation":[]},{"given":"Stephen F.","family":"Tanner","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2005,4,14]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma00208a047"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/0141-8130(87)90056-0"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1432-1033.1982.tb06997.x"},{"key":"e_1_2_1_5_2","doi-asserted-by":"publisher","DOI":"10.1021\/bi00401a020"},{"key":"e_1_2_1_6_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1432-1033.1973.tb02599.x"},{"key":"e_1_2_1_7_2","doi-asserted-by":"publisher","DOI":"10.1021\/bi00310a021"},{"key":"e_1_2_1_8_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF01121955"},{"key":"e_1_2_1_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/0003-2697(88)90021-8"},{"key":"e_1_2_1_10_2","doi-asserted-by":"publisher","DOI":"10.1016\/0022-0248(88)90332-6"},{"key":"e_1_2_1_11_2","doi-asserted-by":"publisher","DOI":"10.1002\/bip.360250213"},{"key":"e_1_2_1_12_2","doi-asserted-by":"publisher","DOI":"10.1002\/bip.360291411"},{"key":"e_1_2_1_13_2","series-title":"ACS Symp. 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