Retinal colour duplex scanning during LASIK-ring suction with different keratomes.

Purpose: The purpose was to measure the blood flow velocity during the suction phase of LASIK.

Setting: University Eye Hospital, Martin-Luther-University Halle-Wittenberg, Halle, Germany.

Methods: Papillary blood flow velocity was measured by colour Doppler sonography.

[The acid-base balance in the blood of calves of different breeds in a mother cow herd raised on deep straw and strawless conditions].

The influence of two different animal loose housing systems (deep litter resp. gum lying area/slatted floor) with additional calf pen on blood gases and buffer systems in the blood of 19 calves of the breed Deutsche Schwarzbunte and 20 calves of the breed Deutsche Rotbunte of both sexes in a suckler cow herd was examined in a period from the first to the sixth month of life. The pH of the blood remains within the well-known small limit of variability, and no exogenic influences could be seen.