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Abstract

The effects of four low doses of synthetic steroids, administered orally and starting on day 8 (group I) or on day 10 of the menstrual cycle (group II), upon LH surge, ovarian steroidogenesis, follicular maturation and menstrual cycles were studied in 10 eumenorrheic women. The results revealed that the day before the LH surge, the highest level of estrone-3-glucuronide was observed in both groups. Twenty-four hours after the last dose, the maximum urinary LH levels were recorded in groups I (day 11), and II (day 13). Pregnanediol-3 alpha glucuronide remained low during the study in group I, whereas in group II a gradual rise of this hormone starting on day 13 was registered and the highest level was found at day 21 of the menstrual cycle. Follicular maturation and ovulation were observed only in women from group II. Short and normal length cycles were recorded in groups I and II, respectively. In summary, low doses of exogenous synthetic steroids administered on day 8, but not on day 10 of the cycle, inhibit follicular maturation and ovulation.

Calidad del empleo y segmentación laboral: un análisis para el mercado laboral colombiano 2001-2006

“…Los trabajos mejor remunerados son los que cuentan con una mejor categorización social y una mayor estabilidad del empleo y, en general, se relacionan con mejores condiciones de vida; por otro lado, los puestos de trabajo más inestables tienden a estar asociados a bajos ingresos, menor categorización social y, en general, peores condiciones laborales (Recio, 1997). Los empleos de buena calidad tienen atributos que se han generalizado principalmente en estudios empíricos (Farné, 2003), los cuales permiten acercarse a una definición más acertada de este concepto.…”