Effects of homonuclear scalar couplings during multiple refocusing sequences in nuclear magnetic resonance
Graph Chatbot
Chat with Graph Search
Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.
DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.
A Turkish couple suffering from McArdle disease (myophosphorylase deficiency) and their two sons aged 5 and 9 years, respectively, were studied using 31phosphorus magnetic resonance spectroscopy (31P MRS). During exercise both sons showed the same patholog ...
A novel approach to inversion recovery in NMR is described which combines adiabatic inversion with the observation of a spin echo refocused by a chirp pulse. This echo method allows one to generate in-phase magnetization over a broad range of frequencies. ...
Longitudinal nuclear magnetic relaxation in coupled two-spin systems is discussed in terms of magnetization transfer modes, a generalization of the magnetization modes commonly used in the discussion of one-dimensional NMR relaxation expts. The symmetry pr ...
A novel spin-echo expt. is proposed that uses semiselective Gaussian pulse cascades for refocusing in systems with homonuclear couplings. The expt. allows one to obtain evdience of differential T2 effects due to cross-correlation of proton chem. shift anis ...
If the 90 Deg selective pulses that are normally used for vol. localization are replaced with self-refocusing 270 Deg pulses having a Gaussian time-domain amplitude profile, various pulse sequences can be made shorter, thus reducing the effects of transver ...
The peak intensities within the multiplets in a 2-dimensional NOESY expt. with small flip angles reflect the transition probabilities due to dipolar and other relaxation mechanisms. In the initial rate approxn., the relaxation rates (elements of the W matr ...
A soln. is presented to the problem of phase dispersion in the resultant magnetization for pulses used for high-resoln. NMR work by demonstrating how a Gaussian pulse having an on-resonance flip angle of 270 Deg has much improved phase properties over the ...
The measurement of the migration of longitudinal 2-spin order by 2-dimensional (2D) exchange spectroscopy or by selective 1-dimensional (1D) methods (2D or 1D zz-exchange spectroscopy) allows unambiguous differentiation between chem. exchange and cross-rel ...
In NMR of quadrupolar spins with S >= 3/2, excitation and observation of multiple-quantum coherence is possible in the absence of scalar, dipolar, or quadrupolar splittings, in contrast to the widely accepted view that nonvanishing couplings are a prerequi ...
A discussion with 8 refs. is given on the assignment of NMR spectra of complex systems, such as 1H or 13C spectra of macromols., which can be greatly facilitated by exploiting the phenomenon of coherence transfer. The topol. of the spin systems, i.e. the n ...
