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(13)C, (15)N CPMAS NMR and GIAO DFT calculations of stereoisomeric oxindole alkaloids from Cat's Claw (Uncaria tomentosa).
Solid State Nucl Magn Reson. 2008 Nov;34(4):202-9. doi: 10.1016/j.ssnmr.2008.10.002. Epub 2008 Oct 22.
Solid State Nucl Magn Reson. 2008.
PMID: 19019638
Theoretical GIAO DFT calculations of shielding constants provide arguments for identification of asymmetric centers and proper assignment of NMR spectra. These alkaloids are 7R/7S and 20R/20S stereoisomeric pairs. Based on the (13)C CP MAS chemical shifts the 7S alkaloids …
Theoretical GIAO DFT calculations of shielding constants provide arguments for identification of asymmetric centers and proper assignment of …
Surface Superconductivity Changes of Niobium Sheets by Femtosecond Laser-Induced Periodic Nanostructures.
Cubero Á, Martínez E, Angurel LA, de la Fuente GF, Navarro R, Legall H, Krüger J, Bonse J.
Cubero Á, et al.
Nanomaterials (Basel). 2020 Dec 16;10(12):2525. doi: 10.3390/nano10122525.
Nanomaterials (Basel). 2020.
PMID: 33339202
Free PMC article.
This study pays special attention to the surface superconducting layer that persists above the upper critical magnetic field strength H(c2), and disappears at a higher nucleation field strength H(c3). Characteristic changes were distinguished between the surface properties …
This study pays special attention to the surface superconducting layer that persists above the upper critical magnetic field strength H(c2), …
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Chemical characterization of naturally weathered oil residues in arid terrestrial environment in Al-Alamein, Egypt.
Barakat AO, Qian Y, Kim M, Kennicutt MC.
Barakat AO, et al.
Environ Int. 2001 Oct;27(4):291-310. doi: 10.1016/s0160-4120(01)00060-5.
Environ Int. 2001.
PMID: 11686640
The ratios of C2-dibenzothiophenes/C2-phenanthrenes (C2-DBTs/C2-PHENs), C3-dibenzothiophenes/C3-phenanthrenes (C3-DBTs/C3-PHENs), C2-chrysenes/C1-chrysenes (C2-CHRYs/C1-CHRYs), and C2-dibenzothiophenes/C1-dibenzothiophenes (C2-DBTs/C1-DBTs) were nearly …
The ratios of C2-dibenzothiophenes/C2-phenanthrenes (C2-DBTs/C2-PHENs), C3-dibenzothiophenes/C3-phenanthrenes (C3-DBTs/ …
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