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1.
Phys Rev Lett ; 105(14): 145701, 2010 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-21230843

RESUMO

This Letter describes the shock-induced amorphization of single-crystal Si bombarded by nanodroplets. At impact velocities of several kilometers per second, the projectiles trigger strong compression pulses lasting tens of picoseconds. The phase transition, confirmed via transmission electron microscopy and electron backscatter diffraction, takes place when the projectile's stagnation pressure is approximately 15 GPa. We speculate that the amorphization results either from the decompression of the ß-Sn phase or during the compression of the diamond phase.

2.
Emergencias (St. Vicenç dels Horts) ; 21(5): 325-332, oct. 2009.
Artigo em Espanhol | IBECS | ID: ibc-84434

RESUMO

Objetivos: Investigar la evolución clínica de los síntomas y comprobar la seguridad del alta directa desde el servicio de urgencias hospitalario (SUH) en mujeres afectadas depielonefritis aguda (PNA) no complicada. Método: Estudio prospectivo, longitudinal, no intervencionista y multicéntrico de pacientes procedentes de 2 SUH diferentes con PNA no complicada cuya permanencia en el SUH fuese inferior o igual a 24 horas. Se recogieron antecedentes, datos de la enfermedad actual, exploraciones complementarias y tratamiento prescrito. A los 3-5días del alta se contactó telefónicamente para valorar su curación clínica (resoluciónde la fiebre, el dolor lumbar y el síndrome miccional) y, en caso de persistir algún síntoma, se contactó de nuevo a los 7-10 días. Se registraron las reconsultas y si ellohabía comportado cambios en el tratamiento y/o había requerido hospitalización. Resultados: Se incluyeron 71 mujeres, el 83% presentaba curación completa a los 10días del alta del SUH. Las curvas de curación resultaron casi superponibles en ambos SUH (p = NS). El dolor lumbar fue el síntoma que más tardó en desaparecer (p < 0,01respecto a la fiebre y el síndrome miccional). Reconsultaron 12 pacientes (16,9%) y sólo2 de ellas (2,8%) tuvieron que ser hospitalizadas. Algún factor se relacionó con la mayor persistencia de algún síntoma en concreto, pero ninguno con una curación más precoz. Conclusiones: La mayoría de las pacientes diagnosticadas de PNA no complicada alcanzan la curación clínica sin necesidad de hospitalización, por lo que es seguro proceder al alta directa desde el SUH tras un periodo de observación que permita administrarla primera dosis de antibiótico parenteral, elegir un antibiótico oral adecuado, advertir a la paciente de la posible duración prolongada de algunos síntomas y remitirla a un control ambulatorio adecuado (AU)


Objective: To determine the clinical course and safety of patients discharged home after hospital emergency department treatment of acute uncomplicated pyelonephritis. Methods: This prospective, longitudinal, nonintervention, multicenter study enrolled women diagnosed with acute uncomplicated pyelonephritis at 2 hospital emergency services. No patient stayed in the emergency room longer than24 hours. Medical history, current complaints, test results, and prescribed treatment were recorded for all patients. Between 3 to 5 days after discharge the patient was telephoned to assess clinical course (resolution of fever, lower backpain, and urinary tract symptoms). If symptoms persisted, the patient was called again between 7 and 10 days after discharge. The caller asked if the patient had consulted another doctor and if that consultation led to changes in treatment and/or hospitalization was required. Results: Seventy-one patients were enrolled; 83% experienced complete resolution within 10 days of discharge. The survival curves of cures were practically identical for the 2 emergency services (no significant difference). Lower back pain was the symptom that took the longest to resolve (P<.01, with respect to both fever and urinary tract symptoms).Twelve patients (16.9%) consulted a doctor again and only 2 (2.8% of the entire cohort) had to be hospitalized. Although certain factors were associated with longer duration of certain symptoms, no particular factor was found to correlate with early resolution. Conclusions: Most patients diagnosed with acute pyelonephritis are cured without requiring hospitalization. Discharge home from the emergency department is therefore justified after an observation period in which a first parenteral antibiotic dose is administered and an appropriate oral antibiotic is chosen. The patient should be warned of the possibility of the persistence of some symptoms and referred for appropriate outpatient follow-up (AU)


Assuntos
Humanos , Feminino , Pielonefrite/epidemiologia , Infecções Urinárias/epidemiologia , Estudos Prospectivos , Assistência Ambulatorial/métodos , Recidiva , Pielonefrite/diagnóstico , Pielonefrite/tratamento farmacológico
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