RESUMEN
The advance of the agricultural frontier in the north of Río Negro led to the land on the plateau being used for dryland livestock production. Livestock practices such as these result in an ecological imbalance that involves the spontaneous plant species in the scrublands. In this study, the species that grow spontaneously in this area were identified, as well as their specific richness and distribution. The native species were related to cattle consumption and the exotic species to toxic potential. The Sörensen similarity index was calculated to express the degree of similarity between the sites. The study area included 59 families, 197 genera and 300 species of vascular plants. The most representative families being the Asteraceae, Poaceae, Fabaceae, Solanaceae, Verbenaceae and Chenopodiaceae. The highest percentage of species consumed were native and 66% of the exotic species are potentially toxic to cattle. The Riparian Zone presented a greater number of exotic species. The highest similarity was between the Plateau Plain and the Foot of Escarpment. The information provided is a basis for evaluative studies between dryland cattle production and plant conservation in the Middle Valley of Río Negro.
El avance de la frontera agropecuaria en el norte de Río Negro impulsó a que los campos de meseta se destinaran a la producción ganadera de secano. Dichas prácticas ganaderas generan un desequilibrio ecológico que involucra a las especies vegetales espontáneas del monte. En este trabajo se identificó las especies que crecen en forma espontánea en estos campos, su distribución y su riqueza específica; se relacionó las especies nativas con el consumo por parte del ganado y las especies exóticas con el potencial tóxico y se calculó el índice de similitud de Sörensen para expresar el grado de semejanza entre los sitios. El área estudiada cuenta con 59 familias, 197 géneros y 300 especies de plantas vasculares. Las familias más representativas son Asteraceae, Poaceae, Fabaceae, Solanaceae, Verbenaceae y Chenopodiaceae. El mayor porcentaje de especies consumidas son nativas y el 66% de las especies exóticas son potencialmente tóxicas para el ganado. La Zona Riparia presenta mayor número de especies exóticas. La similitud más elevada se da entre la Planicie de Meseta y el Pie de Barda. Los aportes brindados son la base para estudios evaluativos entre la ganadería de secano y la conservación vegetal en el Valle Medio de Río Negro.
RESUMEN
In order to determine the normal values of arterial blood gases in the umbilical artery of term infants at 3400 m altitude, a cross-sectional study was conducted. It was performed in the umbilical artery blood of 300 term infants, with an adequate gestational age and whose birth took place between January 2010 and December 2011 at the Essalud National Hospital Adolfo Guevara Velazco (Cusco, Peru). It was found that the average pH of healthy term infants was 7.33 ± 0.07; the values for percentiles 5 and 95 were 7.18 and 7.40 respectively. Tables with the 5th and 95th percentiles for pH, pO2, pCO2, SO2, p50, base excess and HCO3 of the umbilical artery of term infants at 3400 m altitude are provided.
Asunto(s)
Altitud , Análisis de los Gases de la Sangre , Sangre Fetal , Recién Nacido/sangre , Estudios Transversales , Humanos , Perú , Valores de Referencia , Nacimiento a TérminoRESUMEN
Con el objetivo de determinar los valores normales de gases en sangre en la arteria umbilical de neonatos a término a 3400 m de altitud se hizo un estudio transversal, realizado en la sangre de la arteria umbilical de 300 neonatos a término, adecuados para la edad gestacional y cuyo parto se dio entre enero de 2010 a diciembre de 2011 en el Hospital Nacional Adolfo Guevara Velazco de EsSalud (Cusco, Perú). Se encontró que la media del pH de neonatos sanos a término fue de 7,33 ± 0,07, los valores para los percentiles 5 y 95 fueron 7,18 y 7,40 respectivamente. En conclusión, se han construido las tablas con los percentiles 5 al 95 para el pH, pO2, pCO2, SO2, p50, exceso de bases y HCO3, de la arteria umbilical de neonatos a término a 3400 m de altitud.
In order to determine the normal values of arterial blood gases in the umbilical artery of term infants at 3400 m altitude, a cross-sectional study was conducted. It was performed in the umbilical artery blood of 300 term infants, with an adequate gestational age and whose birth took place between January 2010 and December 2011 at the Essalud National Hospital Adolfo Guevara Velazco (Cusco, Peru). It was found that the average pH of healthy term infants was 7.33 ± 0.07; the values for percentiles 5 and 95 were 7.18 and 7.40 respectively. Tables with the 5th and 95th percentiles for pH, pO2, pCO2, SO2, p50, base excess and HCO3 of the umbilical artery of term infants at 3400 m altitude are provided.