Diatoms response to salinity changes: investigations using single pulse and cross polarisation magic angle spinning 29Si NMR spectra

The Analyst ◽  
2018 ◽  
Vol 143 (20) ◽  
pp. 4930-4935
Author(s):  
M. R. Johnston ◽  
J. R. Gascooke ◽  
A. V. Ellis ◽  
S. C. Leterme
Keyword(s):  
Nmr Spectra ◽  
Single Pulse ◽  
Magic Angle Spinning ◽  
Thalassiosira Pseudonana ◽  
Magic Angle ◽  
29Si Nmr ◽  
Chaetoceros Muelleri ◽  
Salinity Changes ◽  
29Si Nmr Spectra ◽  
Angle Spinning

Diatoms Thalassiosira pseudonana and Chaetoceros muelleri (Bacillariophyceae) were cultured at three different salinities and examined using 29Si MAS-NMR spectroscopy.

NMR of Tissues Exposed to Polysiloxane Gels

1998 ◽  
Vol 71 (1) ◽  
pp. 95-104 ◽  
Author(s):  
Leoncio Garrido
Keyword(s):  
Biomedical Applications ◽  
Breast Implants ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
29Si Nmr ◽  
29Si Nmr Spectra ◽  
Angle Spinning ◽  
Polysiloxane Gel

Abstract Silicone (polysiloxanes) gel-filled implants have been widely used for biomedical applications, mainly because they were considered to be nonbiodegradable. However, increasing concern about the health implications of polysiloxane exposure for women with silicone gel-filled breast implants has prompted interest to study the biochemistry of implanted polysiloxanes. The purpose of this work is to investigate the migration of polysiloxanes from the implant to local and distant sites and their chemical modification in living systems. Tissues from animals and humans exposed to polysiloxane gel implants are studied in vivo using proton NMR localized spectroscopy, and in vitro with proton and 29Si magic angle spinning (MAS) NMR spectroscopy. This work demonstrates that free polysiloxanes present in the gel-filled implants migrate to surrounding tissues and distant organs, such as the liver. In addition, 29Si NMR spectra of metabolically active tissues (liver) show the presence of chemically unchanged polysiloxanes and other silicon-containing compounds (silica) which suggest that these polymers are biodegradable.

Spinning-frequency-dependent linewidths in 1H-decoupled 13C magic-angle spinning NMR spectra

1994 ◽  
Vol 227 (6) ◽  
pp. 639-644 ◽  
Author(s):  
Toshihito Nakai ◽  
Charles A. McDowell
Keyword(s):  
Nmr Spectra ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Frequency Dependent ◽  
Angle Spinning

CPMAS (cross-polarization magic angle spinning) carbon-13 NMR spectra of quinones, hydroquinones, and their complexes. Use of CMR to follow a reaction in the solid state

1985 ◽  
Vol 107 (17) ◽  
pp. 4898-4904 ◽  
Author(s):  
J. Scheffer ◽  
Y. F. Wong ◽  
A. O. Patil ◽  
D. Y. Curtin ◽  
I. C. Paul
Keyword(s):  
Solid State ◽  
Nmr Spectra ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Cross Polarization ◽  
Angle Spinning

Structural Characterization of Zeolites by High Resolution Magic-Angle-Spinning Solid State 29Si-NMR Spectroscopy

1984 ◽  
pp. 193-210 ◽  
Author(s):  
Zelimir Gabelica ◽  
Janos B. Nagy ◽  
Philippe Bodart ◽  
Guy Debras ◽  
Eric G. Derouane ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
High Resolution ◽  
Structural Characterization ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
29Si Nmr ◽  
Angle Spinning ◽  
29Si Nmr Spectroscopy

Article

1999 ◽  
Vol 77 (11) ◽  
pp. 1962-1972
Author(s):  
Scott Kroeker ◽  
Roderick E Wasylishen
Keyword(s):  
Nmr Spectra ◽  
Magic Angle Spinning ◽  
Mas Nmr ◽  
Spin Coupling ◽  
Group Symmetry ◽  
Magic Angle ◽  
Chemical Shielding ◽  
Shielding Tensor ◽  
Angle Spinning ◽  
Spin Spin Coupling

Direct NMR observation of copper-63/65 nuclei in solid K3Cu(CN)4 provides the first experimental example of anisotropic copper chemical shielding. Axially symmetric by virtue of the space group symmetry, the shielding tensor spans 42 ppm, with the greatest shielding when the unique axis is perpendicular to the applied magnetic field. The nuclear quadrupole coupling constant is also appreciable, CQ(63Cu) = -1.125 MHz, reflecting a deviation of the Cu(CN)43- anion from pure tetrahedral symmetry. Spin-spin coupling to 13C nuclei in an isotopically enriched sample is quantified by line-shape simulations of both 13C and 63/65Cu magic-angle spinning (MAS) NMR spectra to be 300 Hz. It is shown that this information is also directly available by 63/65Cu triple-quantum (3Q) MAS NMR. The relative merits of these three approaches to characterizing spin-spin couplings involving half-integer quadrupolar nuclei are discussed. Chemical shielding tensors for nitrogen-15 and carbon-13 are obtained from NMR spectra of non-spinning samples, and are compared to those of tetrahedral group 12 tetracyanometallates. Finally, 2J(63/65Cu,15N) detected in 15N MAS experiments are found to be 19 and 20 Hz for the two crystallographically distinct cyanide ligands.Key words: NMR, quadrupolar nucleus, chemical shielding tensor, multiple-quantum magic-angle spinning, metal cyanide, spin-spin coupling.

scholarly journals Effect of positional isomerism and vanadium substitution on 51V magic angle spinning NMR Spectra Of Wells-Dawson polyoxotungstates

2017 ◽  
Vol 84 ◽  
pp. 28-33
Author(s):  
Rupal Gupta ◽  
Wenlin Huang ◽  
Lynn C. Francesconi ◽  
Tatyana Polenova
Keyword(s):  
Nmr Spectra ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Vanadium Substitution ◽  
Positional Isomerism ◽  
Angle Spinning

Distinction between normal and renal cell carcinoma kidney cortical biopsy samples using pattern recognition of1H magic angle spinning (MAS) NMR spectra

2000 ◽  
Vol 13 (2) ◽  
pp. 64-71 ◽  
Author(s):  
A. Rosemary Tate ◽  
Peta J. D. Foxall ◽  
Elaine Holmes ◽  
Detlef Moka ◽  
Manfred Spraul ◽  
...  
Keyword(s):  
Renal Cell Carcinoma ◽  
Pattern Recognition ◽  
Cell Carcinoma ◽  
Renal Cell ◽  
Nmr Spectra ◽  
Magic Angle Spinning ◽  
Mas Nmr ◽  
Magic Angle ◽  
Angle Spinning

Ultrafast high-resolution magic-angle-spinning NMR spectroscopy

The Analyst ◽  
2015 ◽  
Vol 140 (12) ◽  
pp. 3942-3946 ◽  
Author(s):  
Marion André ◽  
Martial Piotto ◽  
Stefano Caldarelli ◽  
Jean-Nicolas Dumez
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
Nmr Spectra ◽  
Magic Angle Spinning ◽  
Mas Nmr ◽  
Magic Angle ◽  
Solid Samples ◽  
Semi Solid ◽  
Angle Spinning

The acquisition of ultrafast high-resolution magic-angle spinning (HR-MAS) NMR spectra of semi-solid samples is demonstrated.

Sealed capsules for convenient acquisition of variable-temperature controlled-atmosphere magic-angle-spinning NMR spectra of solids

1986 ◽  
Vol 68 (3) ◽  
pp. 561-563 ◽  
Author(s):  
T Adrian Carpenter ◽  
Jacek Klinowski ◽  
D Tilak ◽  
B Tennakoon ◽  
Cyril J Smith ◽  
...  
Keyword(s):  
Nmr Spectra ◽  
Variable Temperature ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Controlled Atmosphere ◽  
Temperature Controlled ◽  
Angle Spinning

A Comparison of NMR Spectra Obtained for Solid-Phase-Synthesis Resins Using Conventional High-Resolution, Magic-Angle-Spinning, and High-Resolution Magic-Angle-Spinning Probes

1996 ◽  
Vol 119 (1) ◽  
pp. 65-75 ◽  
Author(s):  
Paul A. Keifer ◽  
Laima Baltusis ◽  
David M. Rice ◽  
Adrienne A. Tymiak ◽  
James N. Shoolery
Keyword(s):  
High Resolution ◽  
Nmr Spectra ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Phase Synthesis ◽  
Angle Spinning
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