[Inhibiting effects of mixtures of alpha-tocopherol with beta-carotene or vitamin A during oxidation of polyunsaturated fatty acid esters].

The inhibitory activities of individual natural antioxdants (AOs), such as alpha-tocopherol (I), beta-carotene (II), vitamin A(III) and their mixtures were comparatively studied when oxidation of microbial polyunsaturated fatty acid esters that predominately contain ethyl arachidonate was initiated; effects of antagonism were found in the combined action of I and II, I and III. The magnitude of antagonism effect was estimated from the difference between the total additive effects of individual AOs and the experimentally determined effects of their mixture. There is a U-dependence of changes in the antagonism values upon II concentrations at steady-state I levels.

[Functional mechanisms of the adaptation of the cardiovascular system in premature children].

Uni-dimensional echocardiography was used to determine cardiac output in 84 conventionally normal premature infants aged 7-30 days. The children aged 7-15 days demonstrated a direct relationship between the stroke and minute volumes of the heart and body weight. However, such a relationship was not discovered in infants aged 16-30 days.