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Dans le but de connaitre avec precision la chronologie de la gestation chez le blaireau europeen ,une etude du developpement embryonnaire et foetal in utero a ete menee afin d'etablir des courbes de croissance staturale et ponderale

Recently reported measurements of the circular polarization of the radiation from extragalactic radio sources have indicated that the polarization may be variable1 and that the polarization is greatest for sources with flat or inverted spectra2,3. To confirm these findings and to clarify the relationship between observation and theory4−6 we have initiated a series of measurements using the Parkes 64-m telescope.

Circular polarization measurements were made with the Parkes 64 m telescope on 66 mainly extragalactic sources, 33 of which were studied at two or more frequencies. Circular polarization was definitely found in the eight quasi-stellar sources PKS0237-23, 0537-441, 1127-14, 1226+02 (3C273), 1253-05 (3C279), 2134+004, 2145+06 and 2345-16, as it was measured at the 4u level or higher in at least two observing sessions.