Read e-book online Advanced Magnetic Resonance Techniques in Systems of High PDF

By A. J. Shaka, Ray Freeman (auth.), Neri Niccolai, Gianni Valensin (eds.)

ISBN-10: 146158521X

ISBN-13: 9781461585213

ISBN-10: 1461585236

ISBN-13: 9781461585237

The moment quantity of the sequence on inorganic biochemistry and bio­ physics is singularly dedicated to magnetic resonance on platforms of excessive molecular complexity. lately, there were vital advances in magnetic resonance stories of polymers; those advances contact on all features of magnetic resonance, either theoretical and utilized. specific emphasis is positioned the following on multipulse experiments. We think such an file can be of substantial curiosity to the readers of our sequence because of the significance of magnetic resonance recommendations within the research of biopolymers. Ivano Bertini Harry grey sequence Editors Preface This ebook is a list of the court cases of the overseas Symposium on "Advanced Magnetic Resonance concepts in platforms of excessive Molecular Complexity", which was once held in Siena among 15 and 18 could 1985. the assumption of the assembly is because of Proff. N.M. Atherton, G. Giacometti and E. Tiezzi with the purpose of honouring the clinical character of Prof. S.I. Weissman. The assembly has been equipped with the help of a countrywide Committee shaped via R. Basosi, I. Bertini, P. Bucci, C. Corvaia, A. Gamba, G. Martini, G.F. Pedulli, P.A. Temussi, and C.A. Veracini. The invited academics answered enthusiastically and a complete photograph of the theoretical and functional elements of magnetic resonance might be for this reason supplied. The publication comprises all of the plenary lectures brought throughout the assembly and likewise a big variety one of the large volume of contributions amassed by means of the organizers.

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3732 PBB, Vol. 2 Advanced Magnetic Resonance Techniques in Systems of High Molecular Complexity G) 1986 Birkhauser Boston, Inc. NW14, Cambridge, Mass 02139, USA Two very different ways of simplifying homonuclear 2D correlation spectra are presented. "r, ! ~, f J •• " E 2 Q. Q. I:: :3 (\j ..... ~ , , >/ ~::;:~. : . ). \ . ,. i:: . , ~:: : :~ I .. Ii, iU' :3 W2/27T' 2 0 ppm Figure 1 - Double-quantum filtered COSY of BPTI 50 In the first case the simplification is achieved by using a pulse sequence designed to excite intense high-order multiple-quantum coherences providing the spin system conforms to a given coupling topology (1).

In this case one is dealing with two rotating frames that precess with different Larmor frequencies about the static magnetic field axis. scalar interaction, LS, then reduces to I S X x' because the y The and z components rotate at different Larmor frequencies. , and "I=~LI/2n, "S=,gSLS/2n, one obtains for the Hamiltonian under spin-locked conditions: (3) ~. In matrix form, this Hamiltonian is given by: . ~ "1 +lIS 0 0 J/4 0 "1-lIS J/4 0 0 J/4 11 -11 J/4 0 S 1 0 0 -1I1 -lIS (4) 27 and this matrix operates in the basic operator product function basis.

1: n. n. N II _ - - - - Tyr-23 '" ----= I: '" '" . IX) o '" o ,... o ... Y N ,... B '",... IX) ,... 6, using a 35 ms spin lock period. (6), and additionally suggests that resonances of Phe-22 should be reassigned as indicated 37 The phase alternated spin lock version of the Hartmann Hahn experiment makes it possible to cover fairly large spectral widths. 5 kHz rf field strength. Although the amplifier generated 8 W, 6 dB of this power was lost in the electronic circuitry (tuned diodes, bandpass filter, gating circuitry) and only 2 W rf power was dissipated in the high resolution probehead of our 500 MHz 1H probe.

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Advanced Magnetic Resonance Techniques in Systems of High Molecular Complexity by A. J. Shaka, Ray Freeman (auth.), Neri Niccolai, Gianni Valensin (eds.)

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