Safety effects of unsignalized superstreets in North Carolina.

Arterials across the United States are experiencing far too many collisions. Agencies tasked with improving these arterials have few available effective solutions. Superstreets, called restricted crossing u-turns by the Federal Highway Administration (FHWA), are part of a menu of unconventional arterial intersection designs that may provide a promising solution. Up to this point, there is little valid information available on the safety effects of superstreets, as study results have been from basic analyses that only account for traffic volume changes. The purpose of this research was to determine the safety effects of the unsignalized superstreet countermeasure on existing arterials in North Carolina. The safety study involved traffic flow adjustment, comparison-group, and Empirical Bayes analyses of 13 unsignalized superstreet intersections in North Carolina. The superstreets have been installed in the last few years across the state as opportunities presented themselves, but not necessarily at the most hazardous sites. The unsignalized superstreet countermeasure showed a significant reduction in total, angle and right turn, and left turn collisions in all analyses. Analyses also showed a significant reduction in fatal and injury collisions. The authors recommend that future analysts use a crash modification factor of 46 percent when considering the conversion of a typical unsignalized arterial intersection into a superstreet.

Papel de la mitomicina C como adyuvante a la radioterapia en el tratamiento de cáncer del cuello uterino localmente avanzado / Role of mitomycin C as adyunct in the treatment of locally advanced cancer of uterine cervix

El cáncer de cuello uterino representa un problema de grandes proporciones dentro del campo de la oncología en Venezuela, con un incremento en su incidencia desde 1985. Sigue ocupando el primer lugar en la incidencia y mortalidad por cáncer en la población femenina, con 2962 casos nuevos por año y 1214 muertes. La radioterapia constituye el tratamiento de elección en los estadios localmente avanzados de la enfermedad, del estadio IIB en adelante; sin enbargo, los resultados de control local de la enfermedad y sobrevida deben ser mejorados. En 1990 se inicia un estudio fase II en conjunto con la Universidad de Yale con objeto de estudiar el valor de un agente alquilante biorreductor, la mitomicina C, como adyuvante al tratamiento radiante en base a la toxicidad selectiva de esta droga para las células hipóxicas. Este estudio se ha venido realizando en el Hospital Universitario de Caracas, Hospital Domingo Luciani y en el Instituto Médico la Floresta