Valores de zinc y cobre plasmaticos en escolares aparentemente sanos en nivel socieconomico bajo. / Plasma zinc and copper levels in school children apparently healthy from a low socieconomic level

Las deficiencias de zinc y cobre pueden producir manifestaciones clinicas variables, dependiendo de su intensidad. No hay datos acerca del estado nutricional de zinc y cobre en la poblacion chilena. En este estudio se comunican valores sericos de zinc y cobre en escolares aparentemente sanos de nivel socioeconomico bajo. Los valores prometidos +/- SD de zinc y cobre encontrados fueron 121.7 micro/g dl micro 29 (rango 66-218) y 134.8 micro/g dl +/- 39,5 (rango 69-260) respectivamente. La distribuicion por edades y percentiles estan detalladas in extenso

X to Y spermatozoal ratio in normal and oligozoospermic human semen and its relationship to fertility parameters.

The ratio of X to Y spermatozoa in normo and oligozoospermic human semen is established with a fluorescent technic using quinacrine. The relationship between concentration of X and Y spermatozoa to factors that potentially control the fertilizing ability of spermatozoa (i.e. sperm count, vitality, motility and morphology) is analyzed. Out of a total of 44 samples (22 normo and 22 oligozoospermic samples) a ratio of 1:1 in X to Y spermatozoa is found in both groups. The frequency of X to Y spermatozoa in the evaculate is not related to sperm count. It is also independent from morphology, motility, and vitality of spermatozoa.