Accuracy of two mixed venous saturation catheters during long-term use in critically ill patients.
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Catheterization, Central Venous↗
Biomedical subjects
M Specht
Publications and source records attributed to M Specht.
[Notes about molecular weights of aroma compounds].
Classification of 2000 food aroma compounds as to their molecular weight shows an accumulation in the range of 135 to 155, and an upper limit of 310. Molecular masses of substances with high aroma effectiveness are below 200. As aroma compounds are composed only of the elements C, H, O, N and S, even numbers of molecular masses predominate among these substances. A periodicity with an interval of 7 units of molecular mass observed seems to be caused by the presence of complete homologuous series of compounds within the range of low molecular masses.
Flavoring Agents↗
Quantification of transient quadratic phase couplings within EEG burst patterns in sedated patients during electroencephalic burst-suppression period.
The time dynamics of the quadratic phase coupling within burst patterns during electroencephalic burst-suppression has been quantified. It can be shown that a transient quadratic phase coupling (QPC) exists between the frequency ranges 0 to 2.5 and 3 to 7.5 Hz and between the frequency ranges 0 to 2.5 and 8 to 12 Hz. The QPC can be explained by an amplitude modulation, where the slow rhythm modulates the rhythmic activities with a higher frequency. By means of time-variant bicoherence analysis, a strong phase-locking between the modulating and the modulated component can be identified. The phase-locking is demonstrable within the first 250 ms after the burst onset and comes up to the maximum between 750 and 1250 ms. The effect is maintained over the whole first part of the burst (2 s) with a decreasing tendency after 1250 ms. All these effects cannot be found in the EEG before entering the burst suppression period (BSP). The transient coupling phenomena in the EEG bursts during BSP can be regarded as indicators for short-term interrelations between the underlying electrophysiologic processes.
Brain↗