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Сезонные изменения систолического и диастолического давления у студентов и преподавателей РУДН

Under the analysis of statistical data in experiments we try to understand and check how systolic and diastolic pressure depends on seasons. The hypothesis was created that means there is a correlation between season and systolic and diastolic pressure.На основании анализа статистических данных в экспериментах делается попытка понять и оценить взаимосвязь времени года и основных показателей сердечно-сосудистой системы, а именно систолического (САД), диастолического (ДАД) артериального давления и частоты сердечных сокращений (ЧСС). Высказывается гипотеза о том, что смена времени года и изменение вышеназванных показателей находятся в прямой корреляции друг к другу

Potential Chonobiological Triggering Factors of Acute Heart Attack

Abstract: The immediate triggers of acute heart attack or acute coronary syndrome (ACS) are not known exactly. There is a marked increase in sympathetic activity, neuroendocrino-logical dysfunction, oxidative stress and deficiency of 3 fatty acids, vitamins, minerals, as well as antioxidants during ACS. Energy intake and expenditure have diurnal variation throughout 24-hour cycle and any disturbance in this cycle may result into disruption of the endogenous clock and neurohumoral dysfunctions. Clinical studies have reported an increased incidence of reinfarction, sudden death, coronary constriction, myocardial ischaemia, vascular variability disorders and angina, during second quarter of the 24 hour cycle, at the point where there is rapid withdrawal of vagal activity and increase in sympathetic tone. In several studies, among patients with heart attack, there was a significant 2-3 fold increase in cardiac events in the second quarter of the day (6-12 hours) compared to other quarters respectively. Triggers of heart attack were noted in up to 80.0% of patients in various studies. Brain related and psychological mechanisms, i.e., emotional stress, sleep deprivation, cold climate, hot climate, large meals and physical exertion were observed among 30-50% of patients. Such triggers have also been reported in Europe, North America and Asia. These triggering factors are known to enhance sympathetic activity and decrease vagal tone, resulting into increased secretion of plasma cortisol, noradrenaline, aldosterone, angiotensin converting enzyme, interleukin-1, 2, 6, 18 and tumor necrosis factor-alpha, that are proinflammatory. There is also a deficiency in the serum levels of 3 fatty acids, vitamin A, E, C, coenzyme Q10, magnesium, potassium, melatonin, interleukin-10 (antiinflammatory) and increase in TBARS, MDA, diene conjugates, TNF-alpha and IL-6, which are indicators of oxidative damage and inflammation, respectively. It is not clear whether the predisposition of ACS is due to size of the meals or other proinflammatory factors of meals

Хронобиология и хрономика (Международный симпозиум к 90-летию Франца Халберга)

In July, 2009 90 years from the date of a birth of the great scientist of present Franz Halberg (USA) were executed.В июле 2009 г. исполнилось 90 лет со дня рождения великого ученого современности Франца Халберга (США)

Synthesis, spectral, electrochemical and magnetic properties of new asymmetric dicopper(II) complexes bearing chemically distinct coordination sites

Two new unsymmetrical binucleating ligands, 2-[bis(3- N, N -dimethylaminopropyl)-aminomethyl]-6-[prolin-1-yl)methyl]-4-bromophenol [H 2 L 1 ] and 2-[bis(3- N, N -dimethylaminopropyl)aminomethyl]-6-[prolin-1-yl)methyl]-4-methylphenol [H 2 L 2 ], and their dicopper(II) complexes with different exogenous bridging motifs (OAc, Br and Cl) have been prepared and characterized by spectral, electrochemical, magnetic and e.p.r. studies. Electrochemical studies indicate the presence of two irreversible reduction peaks in the cathodic region. Variable temperature magnetic susceptibility studies of the complexes show that the extent of antiferromagnetic coupling increases in the order: OAc − < Cl − < Br − . Broad isotropic or axial symmetric spectral features are observed in powder e.p.r. spectra of the complexes at 77 K. A comparison of the electrochemical and magnetic behaviour of the complexes derived from the ligands is discussed on the basis of an exogenous bridge as well as the substituent at the para position of the phenolic ring.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/43855/1/11243_2004_Article_5272793.pd