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1.
Phys Rev Lett ; 101(10): 102301, 2008 Sep 05.
Artículo en Inglés | MEDLINE | ID: mdl-18851210

RESUMEN

We report measurements of the pi;{-}p-->pi;{0}n differential cross sections at six momenta (104-143 MeV/c) and four angles (0 degrees -40 degrees ) by detection of gamma-ray pairs from pi;{0}-->gammagamma decays using a photon-pair spectrometer at TRIUMF. This kinematic region exhibits a vanishing zero-degree cross section from destructive interference between s and p waves, thus yielding special sensitivity to pion-nucleon dynamics. Our data and previous data do not agree, with important implications for earlier claims of large isospin-violating effects.

2.
Phys Rev Lett ; 88(1): 012301, 2002 Jan 07.
Artículo en Inglés | MEDLINE | ID: mdl-11800938

RESUMEN

New data are presented on the p(e,e'p)pi(0) reaction at threshold at a four-momentum transfer of Q(2) = 0.05 GeV(2)/c(2). The data were taken with the three-spectrometer setup of the A1 Collaboration at the Mainz Microtron MAMI. The complete center of mass solid angle was covered up to a center of mass energy of 4 MeV above threshold. Combined with measurements at three different values of the virtual photon polarization epsilon, the structure functions sigma(T), sigma(L), sigma(TT), and sigma(TL) are determined. The results are compared with calculations in heavy baryon chiral perturbation theory and with a phenomenological model. The measured cross section is significantly smaller than both predictions.

3.
Can J Hosp Pharm ; 45(4): 151-6, 1992 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-10123058

RESUMEN

Cefoxitin has been the prophylactic antibiotic of choice for appendectomy and colorectal surgery at this institution. Recent information suggests that cefazolin and metronidazole given as a single intravenous preparation could be a cost-effective alternative to cefoxitin or cefotetan for surgical antimicrobial prophylaxis of uncomplicated appendectomies. This study was conducted to determine the efficacy, toxicity, and cost of the current antibiotic regimens used for prophylaxis of uncomplicated appendectomies, to evaluate the efficacy, toxicity and cost of the cefazolin plus metronidazole combination in uncomplicated appendectomies, and to facilitate a cooperative working relationship between the Departments of Pharmacy and General Surgery. Although the numbers involved were small, this study suggests that the cefazolin/metronidazole combination is cost-effective. It is suggested that research is warranted in evaluating combinations such as this as cost-effective alternatives to current therapy.


Asunto(s)
Cefazolina/uso terapéutico , Quimioterapia Combinada/uso terapéutico , Metronidazol/uso terapéutico , Servicio de Farmacia en Hospital/economía , Premedicación/economía , Infección de la Herida Quirúrgica/prevención & control , Apendicectomía/efectos adversos , Apendicectomía/economía , Colombia Británica , Cefazolina/economía , Cefoxitina/economía , Cefoxitina/uso terapéutico , Análisis Costo-Beneficio , Costos de los Medicamentos , Quimioterapia Combinada/economía , Estudios de Evaluación como Asunto , Hospitales con más de 500 Camas , Humanos , Relaciones Interdepartamentales , Metronidazol/economía , Servicio de Farmacia en Hospital/estadística & datos numéricos , Distribución Aleatoria , Proyectos de Investigación , Infección de la Herida Quirúrgica/economía , Encuestas y Cuestionarios
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