NMR with Multiple Receivers.
Summary of "NMR with Multiple Receivers."
Parallel acquisition NMR spectroscopy (PANSY) is used to detect simultaneously signals from up to four nuclear species, such as H-1, H-2, C-13, N-15, F-19 and P-31. The conventional COSY, TOCSY, HSQC, HMQC and HMBC pulse sequences have been adapted for such applications. Routine availability of NMR systems that incorporate multiple receivers has led to development of new types of NMR experiments. One such scheme named PANACEA allows unambiguous structure determination of small organic molecules from a single measurement and includes an internal field/frequency correction routine. It does not require the conventional NMR lock system and can be recorded in pure liquids. Furthermore, long-range spin-spin couplings can be extracted from the PANACEA spectra and used for three-dimensional structure refinement. In bio-molecular NMR, multi-receiver NMR systems are used for simultaneous recording of H-1 and C-13 detected multi-dimensional spectra. For instance, the 2D (HA)CACO and 3D (HA)CA(CO)NNH experiments can be recorded simultaneously in proteins of moderate size (up to 30 kDa). The multi-receiver experiments can also be used in combination with the fast acquisition schemes such as Hadamard spectroscopy, computer optimized aliasing and projection-reconstruction techniques. In general, experiments that utilize multiple receivers provide significantly more information from a single NMR measurement as compared to the conventional single receiver techniques.
Agilent Technologies, NMR and MRI Systems, Yarnton, Oxford, OX5 1QU, UK, email@example.com.
This article was published in the following journal.
Name: Topics in current chemistry
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21837554
- DOI: http://dx.doi.org/10.1007/128_2011_226
Medical and Biotech [MESH] Definitions
An element of the rare earth family of metals. It has the atomic symbol Y, atomic number 39, and atomic weight 88.91. In conjunction with other rare earths, yttrium is used as a phosphor in television receivers and is a component of the yttrium-aluminum garnet (YAG) lasers.
Multiple Birth Offspring
The offspring in multiple pregnancies (PREGNANCY, MULTIPLE): TWINS; TRIPLETS; QUADRUPLETS; QUINTUPLETS; etc.
Multiple Sclerosis, Chronic Progressive
A form of multiple sclerosis characterized by a progressive deterioration in neurologic function which is in contrast to the more typical relapsing remitting form. If the clinical course is free of distinct remissions, it is referred to as primary progressive multiple sclerosis. When the progressive decline is punctuated by acute exacerbations, it is referred to as progressive relapsing multiple sclerosis. The term secondary progressive multiple sclerosis is used when relapsing remitting multiple sclerosis evolves into the chronic progressive form. (From Ann Neurol 1994;36 Suppl:S73-S79; Adams et al., Principles of Neurology, 6th ed, pp903-914)
Multiple Chemical Sensitivity
An acquired disorder characterized by recurrent symptoms, referable to multiple organ systems, occurring in response to demonstrable exposure to many chemically unrelated compounds at doses below those established in the general population to cause harmful effects. (Cullen MR. The worker with multiple chemical sensitivities: an overview. Occup Med 1987;2(4):655-61)
Autosomal dominant disorder characterized by cone-shaped epiphyses in the hands and multiple cartilaginous exostoses. Mental retardation and abnormalities of chromosome 8 are often present. The exostoses in this syndrome appear identical to those of hereditary multiple exostoses (EXOSTOSES, HEREDITARY MULTIPLE).
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