Wavelet analysis of intermittent dynamics in nocturnal electrocardiography and electroencephalography data.

This paper presents the results of a study of the characteristics of phase synchronization between electrocardiography(ECG) and electroencephalography (EEG) signals during night sleep. Polysomnographic recordings of eight generally healthy subjects and eight patients with obstructive sleep apnea syndrome were selected as experimental data. A feature of this study was the introduction of an instantaneous phase for EEG and ECG signals using a continuous wavelet transform at the heart rate frequency using the concept of time scale synchronization, which eliminated the emergence of asynchronous areas of behavior associated with the "leaving" of the fundamental frequency of the cardiovascular system.

Wavelet skeletons in sleep EEG-monitoring as biomarkers of early diagnostics of mild cognitive impairment.

Many neuro-degenerative diseases are difficult to diagnose in their early stages. For example, early diagnosis of Mild Cognitive Impairment (MCI) requires a wide variety of tests to distinguish MCI symptoms and normal consequences of aging. In this article, we use the wavelet-skeleton approach to find some characteristic patterns in the electroencephalograms (EEGs) of healthy adult patients and patients with cognitive dysfunctions.

Determination of the working conditions of oncology nurses as professional risks: A qualitative study.

Background: Nurses often face professional risks in their work. Most research in Russia dedicated to professional risks of nurses are quantitative studies and deal with a limited range of issues. There is an apparent lack of qualitative studies on this problem.

[Anomalies in the development and functioning of the reproductive system in Siberian sturgeon, Acipenser baerii Brandt (Acipenseridae), from the Yenisei River].

Based upon long-term studies, the alterations in the development and functioning of the reproductive system in the Yenisei River Siberian sturgeon are analyzed. Primary attention is paid to the malfunctions of gametogenesis during trophoplasmatic growth of the oocytes. Some anomalies were revealed for the first time in the studied population.