Schreiner L J, Pintar M M, Dianoux A J, Volino F, Rupprecht A
Department of Physics, University of Waterloo, Ontario, Canada.
Biophys J. 1988 Jan;53(1):119-22. doi: 10.1016/S0006-3495(88)83073-X.
Preliminary results of neutron quasi-elastic scattering experiments are reported for hydrated paracrystals of sodium deoxyribonucleic acid (NaDNA). The samples were investigated at two water contents: 3.5 +/- 1.0 and 9.5 +/- 1.5 mol H2O per mole nucleotide. The results of the scattering experiments were almost independent of whether the NaDNA fibers were oriented parallel or perpendicular to the momentum transfer. The data indicate that at the lower hydration the water molecules do not diffuse appreciably on the time scale of the neutron measurements (approximately 3 X 10(-10) s). At the higher hydration the water molecules diffuse isotropically in a sphere of 9 A in diameter with a diffusion coefficient of (5 +/- 2) X 10(-6) cm2 s-1.
报道了对脱氧核糖核酸钠（NaDNA）水合副晶体进行中子准弹性散射实验的初步结果。对样品在两种含水量下进行了研究：每摩尔核苷酸含3.5±1.0和9.5±1.5摩尔H₂O。散射实验的结果几乎与NaDNA纤维是平行还是垂直于动量转移方向无关。数据表明，在较低水合度下，水分子在中子测量的时间尺度（约3×10⁻¹⁰秒）内不会有明显扩散。在较高水合度下，水分子在直径为9埃的球体内各向同性扩散，扩散系数为(5±2)×10⁻⁶平方厘米/秒。
