M D Lebeda

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The effect of the competitive relationship between potassium and hydrogen in the excretory mechanism of the kidneys on metabolism was studied in calves. The intraruminal exposure of calves to 5.6 meq potassium chloride (KCl) per kg per day has, in itself, only a slight acidotic effect ascribable to a slight reduction of the excretion of acid by the kidney.(More)
We have measured twitch tension in response to train-of-four stimulation in rat isolated phrenic nerve-hemidiaphragm preparations. Propofol inhibited nerve evoked twitch tension, with 50% inhibition occurring at 420 (SD 29) mumol litre-1. Although propofol 100 mumol litre-1 by itself had no effect on nerve evoked twitch tension, it potentiated the(More)
In four one-year stages (A, B, C, D) in the summer (L) and winter (Z) feeding seasons, the total protein (CB) of blood plasma was determined in 3207 cows included in three groups: I - the first stage of lactation, II - the second stage of lactation, and III - the 8th to 9.5th month of pregnancy. 1948 cows were examined when given the winter feed rations and(More)
Magnesium concentration was investigated in the blood plasma and urine of 3460 cows in the course of four green-feeding seasons and four winter feeding seasons in 1980 to 1984. A decrease in the magnesium content in blood plasma was found to intensify in the last six weeks of gravidity. In the first stage of lactation the magnesium concentrations of plasma(More)
The concentration of ammonia in urine at a known level of energy yielding nutrients offered in feed rations was determined in 987 dairy cows in four summer feeding seasons and 1420 cows in three winter feeding seasons. The long-term average ammonia levels in urine showed no significant variation with the two types of feed rations. Different feed rations in(More)
The degree of dependence of the concentration of total protein, magnesium and beta-carotene in the blood plasma of over 3,400 dairy cows in the first and second phases of lactation and in months 8 and 9-9.5 of pregnancy was attested statistically. It was shown that in late pregnancy the concentration of all three indices drops both with winter and summer(More)
Even though the Code for Nurses calls for nurses to provide nondiscriminatory care and to treat patients with respect, research shows that nurses (1) are reluctant to provide care to and (2) believe that they should have the right to refuse to care for patients with AIDS. This article presents two contrasting situations and focuses on the ethical principle(More)
Glycemia was found in 1270 cows and high-pregnant heifers fed summer feed rations and in 1981 cows fed winter feed rations, with the known levels of energy-yielding nutrients in feed rations for cows in the first (I) and in the second (II) lactation phases and cows and heifers in the eighth to ninth and a half month of pregnancy (III). The levels of(More)
The value of diagnostic maxillary sinus aspiration in patients with abnormal findings on sinus radiographs and fever of unknown origin is unclear. To better define indications for this procedure, the results of 51 sinus aspirations in 34 patients with fevers of unknown origin and abnormal findings on sinus radiographs were analyzed retrospectively. Results(More)