The most important goal of this study is to enhance our understanding of the crucial functional relationships that determine the behavior of the systemic circulation and its underlying physiological regulatory mechanisms with minimal modeling. To the present day, much has been said about the indirect hydraulic effects of right atrial pressure (PRA) via cardiac output (CO) on arterial pressure (...

Plasma renin activity (PRA), aldosterone (aldo) levels, electrolyte levels, and blood pressures were measured in 16 patients with affective disorders taking lithium prophylactically, and in 16 age and sex-matched control subjects. PRA and aldo levels were significantly elevated in the lithium-treated group. There was no difference between the groups in plasma electrolytes or erect and supine bl...

In this study the behavioral effects of sectioning the saphenous nerve at the time of application of the loose ligature and the effect of a selective ?1-adrenergic antagonist for two weeks after tying ligatures was examined. Male Sprague-Dawley rats were used in this study. Animals were divided into six groups: Sham-operated, sciatic nerve ligation (CCI), saphenous nerve section (Saph), CCI + S...

We analyze the properties of probabilistic reversible decide-and-halt automata (DHPRA) and show that there is a strong relationship between DH-PRA and 1-way quantum automata. We show that a general class of regular languages is not recognizable by DHPRA by proving that two ‘‘forbidden’’ constructions in minimal deterministic automata correspond to languages not recognizable by DH-PRA. The shown...

This paper seeks to conceptualise a new approach to the identification of the factors influencing the adoption of a political risk assessment (PRA) function. The research population will comprise a convenience sample of Czech international firms. The information whether or not a firm has set up a PRA function will be obtained via a questionnaire survey. By making use of firm value maximization ...

This paper seeks to develop a research proposal in the field of political risk assessment (PRA) in the context of the “Visegrad Four” countries. A literature review – both theoretical and empirical – is presented; based on which the research framework is developed. Previous studies are concerned mostly with PRA in the context of developed countries, and those in the context of transition and em...