PROPERTIES OF ZNS THIN-FILMS PREPARED BY 248-NM PULSED-LASER DEPOSITION

Pulsed laser deposition (PLD) from a hot pressed manganese doped ZnS target using a KrF laser, has produced a high rate deposition method for growing luminescent thin films. Good stoichiometric quality and typical luminescent crystal structures have been observed with a predominant hexagonal phase and little evidence of the cubic phase. The luminescent characteristics were determined by cathodoluminescence and photoluminescence excitation and stable electroluminescence was observed under pulsed dc conditions with a minimum brightness of 150 cd/m2. PLD film characteristics are compared with those observed in radio-frequency sputtered samples.

Cell type-dependent uptake, localization, and cytotoxicity of 1.9 nm gold nanoparticles

Background: This follow-up study aims to determine the physical parameters which govern the differential radiosensitization capacity of two tumor cell lines and one immortalized normal cell line to 1.9 nm gold nanoparticles. In addition to comparing the uptake potential, localization, and cytotoxicity of 1.9 nm gold nanoparticles, the current study also draws on comparisons between nanoparticle size and total nanoparticle uptake based on previously published data.

Methods: We quantified gold nanoparticle uptake using atomic emission spectroscopy and imaged intracellular localization by transmission electron microscopy. Cell growth delay and clonogenic assays were used to determine cytotoxicity and radiosensitization potential, respectively. Mechanistic data were obtained by Western blot, flow cytometry, and assays for reactive oxygen species.

Results: Gold nanoparticle uptake was preferentially observed in tumor cells, resulting in an increased expression of cleaved caspase proteins and an accumulation of cells in sub G1 phase. Despite this, gold nanoparticle cytotoxicity remained low, with immortalized normal cells exhibiting an LD50 concentration approximately 14 times higher than tumor cells. The surviving fraction for gold nanoparticle-treated cells at 3 Gy compared with that of untreated control cells indicated a strong dependence on cell type in respect to radiosensitization potential.

Conclusion: Gold nanoparticles were most avidly endocytosed and localized within cytoplasmic vesicles during the first 6 hours of exposure. The lack of significant cytotoxicity in the absence of radiation, and the generation of gold nanoparticle-induced reactive oxygen species provide a potential mechanism for previously reported radiosensitization at megavoltage energies.

Plasmonic junctions with cucurbit[5]uril 'glue': fabrication of precise sub-nm junctions in gold nanoparticle assemblies

Aggregation of gold nanoparticles with rigid cucurbit[5]uril molecules generates fixed inter-particle separations of 0.91 nm. These nanoparticle assemblies possess discrete plasmonic modes which elucidate nanoscale growth and serve as molecular-recognition based SERS substrates.

DC resistance and dielectric function at 3392 nm of YBCO films from 300 K to 80 K

The dielectric function of a YBCO film was determined at 3392nm at temperatures down to 80K. Results obtained were epsilon(i) = -24.09 - 0.0013T and epsilon(i) = 7.66 + 0.067T. The results for epsilon(i) are compared with the de resistance of the film. Intrinsic intragrain scattering, elastic and inelastic grain boundary scattering and optical interband absorption are estimated as 82%, 5%, 13% and 10% respecively at 0K.

High-temperature stability study of 1 nm Al2O3 deposited on InAs surfaces investigated by synchrotron radiation based photoemission spectroscopy

High-resolution soft x-ray photoemission spectroscopy (SXPS) has been used to study the high-temperature thermal stability of ultra-thin atomic layer deposited (ALD) Al2O3 layers (~1 nm) on sulfur passivated and native oxide covered InAs surfaces. While the arsenic oxides were removed from both interfaces following a 600 °C anneal, a residual indium oxide signal remained. No significant differences were observed between the sulfur passivated and native oxide surfaces other than the thickness of the interfacial oxide layer while the Al2O3 stoichiometry remained unaffected by the anneals. The energy band offsets were determined for the Al2O3 on the sulfur passivated InAs surface using both valence band edge and shallow core-level photoemission measurements.

Comunicación educativa y creación de ambientes de aprendizaje en la Preparatoria núm. 16 : propuesta de formación magisterial

Tesis (Maestría en Formación y Capacitación de Recursos Humanos) UANL

Relación entre los hábitos de estudio y el rendimiento académico en los alumnos de preparatoria núm. 22 de la Universidad Autónoma de Nuevo León

Tesis (Maestría en Enseñanza Superior) -- U.A.N.L. ; Facultad de Filosofía y Letras, 2004.

La relación de la formación pedagógica del docente de español de la preparatoria núm. 16 de la UANL y el aprovechamiento de sus alumnos

Tesis (Maestría en Enseñanza Superior) U.A.N.L.

Estrategias para incrementar el promedio de la materia de computación en grupos de cuarto semestre de la Preparatoria Núm.23 de la U.A.N.L.

Tesis (Maestro en Ciencias de la Administración con Especialidad en Relaciones Industriales) - UANL, 2004

Decreto núm. 128 sobre establecimiento y formación de Sociedades Patrióticas en el Estado libre de Nuevo León.

UANL

Proyecto de leyes de hacienda formado y circulados por la diputación permanente del honorable congreso del estado de Nuevo León conforme al Art. 2 del decreto núm. 107 y en cumplimiento del acuerto de 29 de marzo del corriente año.

UANL

Acta de fundación de la ciudad de Monterrey : anexo núm. 1

UANL

Suplemento al diario del Gobierno de Méjico núm. 1066 del sábado 31 de marzo de 1838

UANL