RESUMEN
Motivated by recent measurement of the magnetism and conductance of the oxygen-assisted Pt nanojunctions, we performed first principle calculations of the magnetic order and electronic transport by explicitly including fully relativistic effects. Our results show that the spin alignment is a cycloidal spiral feature attributed to the Dzyaloshinskii-Moriya interaction, which indicates that the observed magnetism in experiments is of noncollinear nature. The oxygen concentration is the responsible for the switching of the rotational sense of the spiral magnetic order found in oxygen-assisted Pt nanojunctions. Furthermore, the magnetic moments and magnetoresistances vary with oxygen concentration in the chain, which can be used to tune the magnetism and magnetotransport. The oxygen-assisted Pt nanojunctions offer a possibility for spintronic applications in magnetic memory and quantum devices.
RESUMEN
OBJECTIVE: To study the chemical constituents of Lagopsis supina. METHOD: Compounds were separated by solvent extraction, column chromatography and TLC, and the structures were determined by chemical and spectral analyses. RESULTS: Six compounds were isolated from the ethanol extract of L. supina and identified as eicosanoic acid octadecyl ester, eicosanoic acid-16-methyl-15, 16-hetadecenyl ester, palmitic acid, beta-sitosterol, oleanolic acid and daucosterol. CONCLUSION: Except beta-sitosterol, all the compounds were isolated from this genus for the first time.
Asunto(s)
Lamiaceae/química , Ácido Palmítico/aislamiento & purificación , Plantas Medicinales/química , Sitoesteroles/aislamiento & purificación , Ácido Oleanólico/química , Ácido Oleanólico/aislamiento & purificación , Ácido Palmítico/química , Sitoesteroles/químicaAsunto(s)
Enfermería en Salud Comunitaria/métodos , Enfermería en Salud Comunitaria/normas , Servicios de Atención de Salud a Domicilio/normas , Guías de Práctica Clínica como Asunto , Enfermería en Salud Comunitaria/economía , Femenino , Servicios de Atención de Salud a Domicilio/economía , Humanos , Persona de Mediana Edad , Planificación de Atención al Paciente , Mecanismo de Reembolso , Estados Unidos , United States Agency for Healthcare Research and QualityRESUMEN
PIP: Gossypol has been applied during clinical experiments throughout China and the results of its applications have been quite satisfactory. The process of extracting and purifying gossypol is costly, poisonous, and complicated. Various methods of large-scale extraction of gossypol from cotton seeds through the use of a 75-78% liquid acetone solution are discussed as well as some improvements on the methods currently used for purification of gossypol.^ieng