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(13)C, (15)N CPMAS NMR and GIAO DFT calculations of stereoisomeric oxindole alkaloids from Cat's Claw (Uncaria tomentosa).
Paradowska K, Wolniak M, Pisklak M, Gliński JA, Davey MH, Wawer I. Paradowska K, et al. 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), …
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/ …