Improvement of Seed Germination in Atriplex repanda Phil

Sereno saltbush (Atriplex repanda Phil.) is a valuable browse producer in arid coastal regions of central Chile. Direct seeding has been impractical using the heavily indurated fruits, which in laboratory germination tests yield zero to 2%. Among treatments which have been reported, manually clipping off the bracts has been the most beneficial. Debracted fruits which had not germinated would do so once the testa was ruptured. Bract removal without rupturing the testa was ineffective. Virtually 100% germination was obtained after fruits had been debracted and the testa pierced without damage to the embryo which encircles the endosperm. Germination approaching 10% was obtained from 3000-utricle samples after treatment in a modified small legume-seed scarifier which broke the pericarp and freed the seed. Higher values appear possible and the technique may have application to other small fruits with hard coverings.This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries.The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform August 202

¿Debemos seguir haciendo salpingoooforectomía como profilaxis de cáncer de ovario?

Hasta hace algunos años en las mujeres sometidas a histerectomía por patología benigna, que tuvieran 45 o más años, se efectuaba de regla una salpingoooforectomía (SOB) bilateral, como prevención de cáncer de ovario. Esto está actualmente en discusión. Hay dos grandes estudios de cohortes poblacionales y un estudio prospectivo observacional que analizan los efectos adversos cardiovasculares y el cáncer de ovario en mujeres sometidas a SOB. Basados en estos análisis y otros datos de la literatura, se pueden plantear algunas conclusiones. En mujeres premenopáusicas y hasta los 50 años la conducta óptima es preservar los ovarios, entre 51 y 65 años no está claro que lo mejor sea extirparlos y en mayores de 65 aún no se ha probado efectos deletéreos a raíz de la intervención