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;Title: Biophysics;Authors: Gerald Ehrenstein, Harold Lecar;Subject: NMR spin relaxation;Year: 1982;Link: http://books.google.com/books?id=rThFVFmAdDAC&pg=PA14&dq=rotational+correlation+time+radian;Quote (page 14): "<blockquote>The value of tau_c can be approximated as the timerequired for the molecule containing the resonant nucleus to eitherrotate 1 radian (rotational correlation time) or diffuse a distanceequivalent to its own dimensions (translational correlation time)."</blockquote>

;Title: Protein NMR Spectroscopy (second edition);Authors: John Cavanagh, Wayne J. Fairbrother, Arthur G. Palmer, III,Nicholas J. Skelton, Mark Rance;Subject: NMR relaxation;Year: 2007;Link: http://books.google.com/books?id=2-LqLHOLHZwC&pg=PA366&dq=rotational+correlation+time+radian;Quote (page 366): "<blockquote>...in which the correlation time, tau_c, isapproximately the average time for the molecule to rotate by 1radian."</blockquote>

;Title: Hydration Processes in Biology: Theoretical and Experimental Approaches;Author: Marie-Claire Bellissent-Funel;Subject: Water motion;Year: 1999;Link: http://books.google.com/books?id=9tJaB00wXhgC&pg=PA243&dq=rotational+correlation+time+radian&lr=;Quote (page 243): "<blockquote>For such sites, the rotational and translationaldiffusion of water should both be rate-limited by H-bondrearrangements and it can therefore be argued that the residence time(the time taken to diffusion ca. 3 Angstrom) should be close to thefirst-rank rotational correlation time (the time taken to rotatethrough one radian), i.e., tau_W ~= 3 tau_s (where tau_s is thesecond-rank rotational correlation time)."(Interesting that the factor of 3 is only approximate here!!! Nils,do you have a citation where the equation is not appriximate?)</blockquote>

;Title: NMR of Macromolecules: A Practical Approach;Author: Gordon Carl Kenmure Roberts;Subject: NMR relaxation;Year: 1993;Link: http://books.google.com/books?id=K7n7SnmDbSAC&pg=PA9&dq=rotational+correlation+time+radian&lr=;Quote (page 9): "<blockquote>The rotational correlation time, tau_c, is the timetaken for the particle to rotate through an angle of one radian(57°)."</blockquote>

;Title: Fundamentals of Protein NMR Spectrosopy;Authors: Gordon S. Rule, T. Kevin Hitchens;Subject: NMR relaxation;Year: 2006;Link: http://books.google.com/books?id=8vmf5y6Jf84C&pg=PA441&dq=rotational+correlation+time+radian;Quote (page 441): "<blockquote>[tau_c] is the time required for a molecule torotate, on average, 1 radian."</blockquote>

;Title: Nuclear Magnetic Resonance in Biochemistry: Principles and Applications;Author: Thomas L. James;Subject: NMR;Year: 1975;Link: http://books.google.com/books?id=iItqAAAAMAAJ&q=rotational+correlation+time+radian&dq=rotational+correlation+time+radian&pgis=1;Quote (page ?): "<blockquote>The rotational correlation time (rc or rr) providesa ... having many molecular collisions before it turns 1 radian."</blockquote>

;Title: Biophysical Chemistry: Principles, Techniques, and Applications;Author: Alan G. Marshall;Subject: Rotational diffusion (for fluorescence);Year: 1978;Link: http://books.google.com/books?id=PJhqAAAAMAAJ&q=rotational+correlation+time+radian&dq=rotational+correlation+time+radian&pgis=1;Quote (page 720): "<blockquote>...decay of the correlation function forrotational diffusion, tau_rot may also be thought of as thecharacteristic time it takes for a typical macromolecule to rotate(diffusionally) through an angle of the order of a radian..."</blockquote>

;Title: Practical NMR Relaxation for Chemists;Author: Vladimir I. Bakhmutov;Subject: NMR relaxation;Year: 2004;Link: http://books.google.com/books?id=_gIh9KHIOx4C&pg=PA13&dq=rotational+correlation+time+radian&lr=;Quote (page 13): "<blockquote>However, a more correct definition of the tau_c isconnected with the, so-called autocorrelation function in the theoryof nuclear relaxation where the tau_c is an average time for themolecule to progresses (sic.) through one radian."</blockquote>

;Title: Modern Protein Chemistry: Practical Aspects;Authors: Gary C. Howard, William E. Brown;Subject: NMR relaxation;Year: 2001;Link: http://books.google.com/books?id=MIxdC7GPz0sC&pg=PA45&dq=rotational+correlation+time+radian&lr=;Quote (page 45): "<blockquote>[tau_c] is roughly equal to the time it takes amolecule to rotate 1 radian while undergoing random rotationalmotion."</blockquote>

;Title: MRS of the Brain and Neurological Disorders;Authors: Koji Terada, Akihiro Igata, Toshiro Fujimoto, TetsuhikoAsakura, Institute of Advanced Medical Technology;Subject: Imaging;Year: 2000;Link: http://books.google.com/books?id=kF2dw7c33cAC&pg=PA41&dq=rotational+correlation+time+radian&lr=#PPA43,M1;Quote (page 41): "<blockquote>...Brownian motion. This has a time scale, therotational correlation time (tau_c) defined as the time taken onaverage for a solute molecule to rotate by one radian or roughly thereciprocal of the rate of tumbling in solution of the relevant pieceof the molecule."</blockquote>

;Title: Structural Biology: Practical NMR Applications;Author: Quincy Teng;Subject: NMR relaxation;Year: 2005;Link: http://books.google.com/books?id=dRmmGFkummIC&pg=PA36&dq=rotational+correlation+time+radian&lr=#PPA36,M1;Quote (page 36): "<blockquote>The correlation time is used to describe the rateof random motions and is expressed as the average time betweencollisions for translational motions or the time for a molecule torotate one radian in rotational motion."</blockquote>

;Title: High-resolution NMR Techniques in Organic Chemistry;Author: Timothy D. W. Claridge;Subject: NMR relaxation;Year: 1999;Link: http://books.google.com/books?id=9srIkkL-YMkC&pg=PA283&dq=rotational+correlation+time+radian&lr=#PPA284,M1;Quote (page 283): "<blockquote>... its rotational correlation time, tau_c. Thisis usually taken to define the average time required for the moleculeto rotate through an angle of 1 radian about any axis, ..."</blockquote>

;Title: A Dictionary of Concepts in NMR;Author: S. W. Homans;Subject: NMR relaxation;Year: 1989;Link: http://books.google.com/books?id=wpggNxUrzSMC&pg=PA72&dq=rotational+correlation+time+radian&lr=;Quote (page 72): "<blockquote>For example, in the case of random translationalmotions, tau_c is defined as the mean time between collisions, whereasin the case of reorientational (rotational) motion, it is defined asthe average time for the molecule to rotate by one radian."Note this book later on page 72 makes the mistake (according to me) ofsaying that 1</tau_c is in Hertz.blockquote>

Title: Molecular Crystals and Liquid CrystalsAuthor: Gordon and Breach Science PublishersSubject: CrystalsYear: 1974Link: http://books.google.com/books?id=bTW3AAAAIAAJ&q=rotational+correlation+time+radian&dq=rotational+correlation+time+radian&lr=&pgis=1Quote Note this book later on page 72 makes the mistake (page ?according to me): "The rotational correlation time may be computed fromthe linewidths of the ... roughly the time required for the radical toreorient by saying that 1 radian /tau_c is given by ..in Hertz."

;Title:Molecular Crystals and Liquid Crystals;Author:Gordon and Breach Science Publishers;Subject:Crystals;Year:1974;Link:http://books.google.com/books?id=bTW3AAAAIAAJ&q=rotational+correlation+time+radian&dq=rotational+correlation+time+radian&lr=&pgis=1;Quote (page ?)<blockquote>The rotational correlation time may be computed from the linewidths of the ... roughly the time required for the radical to reorient by 1 radian is given by ...</blockquote> ;Title: Industrial Research/development;Author: Technical Pub. Co.;Subject: NMR relaxation;Year: 1978;Link: http://books.google.com/books?id=EstVAAAAMAAJ&q=rotational+correlation+time+radian&dq=rotational+correlation+time+radian&lr=&pgis=1;Quote (page ?): " <blockquote> is the Larmor angular frequency in radians/sec andtau_c is the rotational correlation time of the nuclei in sec/radian."</blockquote>