Age Difference between the Populations of Binary and Single F Stars Revealed from Hipparcos Data.

We have compared the kinematics and metallicity of the main-sequence binary and single uvby F stars from the Hipparcos catalog to see if the populations of these stars originate from the same statistical ensemble. The velocity dispersions of the known unresolved binary F stars have been found to be dramatically smaller than those of the single F stars. This suggests that the population of these binaries is, in fact, younger than that of the single stars, which is further supported by the difference in metal abundance: the binaries turn out to be, on average, more metal rich than the single stars.

[Caudal epidural anesthesia during surgery of the lower extremities in traumatology and orthopedics].

One hundred and forty operations and eleven manipulations on all the segments of the lower extremities have been performed under caudal epidural anesthesia, i.e. by forming in the caudal canal a dense infiltrate using lidocaine or trimecaine solutions prepared on hypotonic solvent supplemented by microdoses of adrenalin and calcium chloride.

[The dynamics of changes in oxygen tension, circulatory rats, muscular and rectal temperatures in dinitrophenol hyperthermia].

In rabbits, i. v. administration of 2,4-dinitrophenol (20 mg/kg) rapidly increases the temperature and the blood flow speed, simultaneously decreasing the oxygen available, in the skeletal muscle.