Idiopathic orthostatic hypotension: Recent data (eleven cases) and review of the literature

Eight cases of Shy-Drager syndrome and three of Bradbury-Eggleston idiopathic orthostatic hypotension were examined. In all cases, examination of circulatory reflexes showed major dysfunction of the sympathetic vasoconstrictor system. Anomalies in the vagal cardiomoderator system were less constant. Normal urinary elimination of catecholamines was recorded daily. Characteristically, no elevation of blood or urine norepinephrine levels were found in orthostatism. Insulin hypoglycemia normally raised urinary adrenalin elimination in three of ten patients. Plasma dopa-beta-hydroxylase activity was normal. Renin-angiotensin-aldosterone system showed variable activity at basal state but usually rose during orthostatism. On the average, very low homovanillic acid levels were found in cerebrospinal fluid before and after probenecid; hydroxyindolacetic acid was normal. Cerebral autoregulation had deteriorated in two of four cases. Physiopathologically the two clinical types are indistinguishable with or without central neurological signs

A study of experimental acute lung injury in pigs on zero end-expiratory pressure

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Broadband dielectric response of the ionic liquid N-methyl-N-ethylpyrrolidinium dicyanamide

Dielec. relaxation measurements as a function of temp., and of concn. in a non-coordinating solvent, the first reported for an ionic liq., indicate a crossover in the relaxation mechanism due to varying levels of ion aggregation and the interplay of formation kinetics and relaxation dynamics of assocs

Dielectric relaxation in ionic liquids: signatures of liquid structure

Recent dielectric relaxation measurements on ionic liquids have shown that the dielectric response reflects a solution structure that is dominated by aggregates of ions. Despite the presence of some quite strongly polarised molecules, the dielectric constants measured for ionic liquids such as [emim]BF4 and mppy[dca] lies in the region of 10-15; this also reflects the degree of aggregation in the liquid and the limited degree of individual mobility possessed by each ion. This paper will discuss these recent results and their implications and correlate then with quantum mechanical calculations of the structure of the ions