mas-nmr
Structural Study of xNa2S + (1 − x)B2S3 Glasses and Polycrystals by Multiple Quantum MAS NMR of 11B and 23Na
... spectrometers equipped with home-built MAS NMR probes. A 5 mm rotor was filled with a sample in a glovebox and spun at 8 to 10 kHz, which sufficed to remove the spinning sidebands from the central portion ...
12
Modeling of chlorosomal light-harvesting antennae: molecular control of self-assembly of chlorins, resolved by MAS NMR
... Spinning NMR has been used to investigate the self-organization of bacteriochlorophylls in chlorosomal light-harvesting ...Cd MAS NMR signals indicate a five-coordination of the Cd ...combined ...
116
Photo-CIDNP in the reaction center of the diatom Cyclotella meneghiniana observed by 13C MAS NMR
... So far, there are eight species in which the solid-state photo-CIDNP effect has been observed (Figure 1, Table 1). These are all members of either the plant or the bacteria kingdom. According to the taxonomic ...
15
Recognition of membrane sterols by polyene antifungals amphotericin B and natamycin, a 13C MAS NMR Study
... yielded well-resolved resonances. Cholesterol and ergosterol structures are shown in Figure 1 alongside atom numbering used in resonance assignments (Zorin et al., 2010). Pure DOPC membranes were characterized for ...
12
Structure refinement of photosynthetic components with multidimensional MAS NMR dipolar correlation spectroscopy
... several NMR techniques have been developed that can be applied successfully with rapid MAS (≥ 10 kHz) to suppress the strong homonuclear dipolar interactions among the abundant ...high MAS speeds, ...
159
Assessing the detection limit of a minority solid state form of a pharmaceutical by 1H double quantum MAS NMR spectroscopy
... a MAS frequency of 30 ...increasing MAS frequency, 63,64 narrower 1 H linewidths would be observed using the higher MAS frequencies of >60 kHz that can be achieved with rotors of smaller outer ...
27
Mechanochemical Induced Structure Transformations in Lithium Titanates: A Detailed PXRD and 6Li MAS NMR Study
... intensities of the phase, is significantly lowered from 0.60% in model A to 0.28% in model B. However, since Li has a very low X-ray scattering factor the obtained values for the site occupancies in Table 1 are just an ...
17
13C CP/MAS NMR spectra of pectins: a peak fitting analysis in the C 6 region
... To explain the observed changes in the position of pyranoid ring carbon resonances, we calculated the alterations of chemical shifts in trigalacturonic acid as a result of methylation and (or) acetyla- tion. ...
12
Action spectroscopy on dense samples of photosynthetic reaction centers of Rhodobacter sphaeroides WT based on nanosecond laser-flash C-13 Photo-CIDNP MAS NMR
... photo-CIDNP MAS NMR intensities on the excitation wavelength at investigating 15 excitations wavelengths in the range from 720 till 940 ...the NMR detection pulse of 100 ...
12
HR MAS NMR spektroskopi: En hel ny verden for fødevareforskningen
... HR MAS NMR-spektroskopi er oplagt. Med enkeltkerne HR MAS NMR-spektroskopi er det muligt at undersøge sammensætningen af forskellige sorter og forskellige kernefyldningstrin uden at forstyrre ...
6
Measuring 19F shift anisotropies and 1H–19F dipolar interactions with ultrafast MAS NMR
... specific nuclear spin interactions averaged by MAS. This work makes use of the most flexible class of symmetry-based recoupling sequences, designated , which consist of N composite inversion pulses R, timed to ...
14
Surface Selective 1H and 27Al MAS NMR Observations of Strontium Oxide Doped γ-Alumina90-97
... Powdered samples were dried under vacuum at 350ºC overnight, before being packed in air-tight zirconia rotors under an inert atmosphere and were spun at 14 kHz in a static magnetic fi eld strength of 9.4 T. A widebore ...
8
Measuring proton shift tensors with ultrafast MAS NMR
... solid-state NMR Facility used in this research was funded by EPSRC and BBSRC, as well as the University of Warwick, including part funding through Birmingham Science City Advanced Materials Projects 1 and 2, ...
12
1H CSA parameters by ultrafast MAS NMR: measurement and applications to structure refinement
... of NMR crystallography is to develop “spectrum to structure” procedures [19] that involve identifying the actual crystal structure from an ensemble generated by structure prediction software without the need for ...
14
Characterization of Aluminum(III) Complexes in Coal Organic Matter
... Al MAS NMR) spectroscopy is sensitive to the local environment of central Al atoms [16] ...multiple-field NMR measure- ments, lineshape fitting or other more complex methods ...Al MAS ...
17
Quantifying Temperatures in the Early Solar Nebula and on Parent Bodies Using Cation Ordering in Spinel from CAIs in Carbonaceous Chondrites
... spinning frequency of 31.25 kHz, with a pulse width of 0.5 μs which produced a tip angle of 30° (π/6) to the solid. The relaxation delay was 5 seconds. Relative intensities of the tetrahedral and octahedral peaks were ...
566
Solid state NMR characterisation of the thermal transformation of a Hungarian white illite
... Al MAS NMR spectra from these samples showed a peak at ~52 ppm, indicating that all the aluminium became tetrahedrally ...previous NMR studies of these clays was the largely unknown effect of the ...
34
In situ lignocellulosic unlocking mechanism for carbohydrate hydrolysis in termites: crucial lignin modification
... (CP/MAS NMR) spectroscopy, Py-GC/MS with internal standard, and Py-GC/MS in the presence of S in the presence of tetramethylammonium hydroxide (Py- TMAH-GC/MS), in order to understand the lignocellu- losic ...
12
The ambient hydration of the aluminophosphate JDF 2 to AlPO 53(A):insights from NMR crystallography
... P MAS NMR spectroscopy, we have demonstrated that the ambient hydration of JDF-2 to AlPO- 53(A) proceeds slowly, with the hydration complete after 3 months under the conditions ...solid-state NMR ...
11
High-resolution magic angle spinning NMR studies for metabolic characterization of Arabidopsis thaliana mutants with enhanced growth characteristics
... Developing smart crops which yield more biomass to meet the increasing demand for plant biomass has been an active area of research in last few decades. We investigated meta- bolic alterations in two Arabidopsis thaliana ...
15