PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 11145339

Dynamic balancing in NMR double rotor system.

A Chakraborty
View original source ↗Export metadata ↓

Abstract

An exact solution to the problem of dynamic balancing in a NMR double rotor system is presented. This will enable one to perform high speed spinning about two intersecting axes. Double rotation is used in solid state NMR to average away second-order broadening, thus enhancing the resolution of spectra from quadrupolar nuclei in solid state NMR. An exact expression for imbalance due to asymmetric distribution of weights about the rotation axes is provided.

Explore related subjects

Magnetic Resonance SpectroscopyMechanicsJournal ArticleResearch Support, Non-U.S. Gov't

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

A Chakraborty. 2000. Dynamic balancing in NMR double rotor system.. https://doi.org/10.1016/s1386-1425(00)00315-2

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2007

Structure of the alpha-homo-DNA:RNA duplex and the function of twist and slide to catalogue nucleic acid duplexes.

High-resolution NMR studies of an alpha-homo-DNA:RNA duplex reveal the formation of a right-handed parallel-oriented helix. It differs significantly from a standard A- or B-type helix by a small twist value (26.2 degrees ), which leads to a helical pitch of 13.7 base pairs per helical turn, a negative inclination (-1.78 Angstrom) and a large x displacement (5.90 Angstrom). The rise (3.4 Angstrom) is similar to that found in B-DNA. The solution of this new helix structure has stimulated us to develop a mathematical and geometrical model based on slide and twist parameters to describe nucleic acid duplexes. All existing duplexes can be positioned within this landscape, which can be used to understand the helicalization process.

Magnetic Resonance Spectroscopy↗
PubMed2007

15N NMR study of substituted 2-(phenylamino)-5-phenyl-1,3,4-oxadiazoles.

Substituted 2-(phenylamino)-5-phenyl-1,3,4-oxadiazoles were studied by 15N NMR spectroscopy. All signals were assigned on the basis of HMQC and HMBC experiments. Chemical shifts values were correlated with empirical Hammett parameters as well as with calculated electron densities and chemical shieldings.

Magnetic Resonance Spectroscopy↗
PubMed2006

Functionalization of titanium oxide surfaces by means of poly(alkyl-phosphonates).

The use of a multiple attachment sites strategy is considered in order to improve the stability of monomolecular adlayers. The hypothesis was tested in the case of PEG-ylated compounds carrying phosphonate groups, known for their affinity toward titanium oxide surfaces. As a result, a new class of co- and terpolymers were synthesized by free-radical polymerization of three different monomers: dialkyl(methacryloyloxyalkyl)phosphonates, PEG methyl ether methacrylate, and/or butyl methacrylate monomers. Adlayers were formed following a simple dip-and-rinse protocol using diluted aqueous polymer solutions and were characterized by evaluating their thicknesses with variable angle spectroscopic ellipsometry (VASE) and their elemental compositions with X-ray photoelectron spectroscopy (XPS). The same techniques were used to determine changes of the adlayer as a function of exposure to electrolytes at different pH values and to monitor nonspecific protein adsorption upon serum exposures. The results indicated that the poly(alkyl-phosphonate)-based adlayers combine multiple site attachment of phosphonic groups and presentation of PEG side chains to the aqueous environment, resulting in both improved stability over a wide pH range in comparison to the tested reference surfaces and excellent resistance to protein adsorption when exposed to full human serum.

Magnetic Resonance Spectroscopy↗