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Assessing the health of coastal marine ecosystems: A holistic approach based on...
Vassallo, P.; Fabiano, M.; Vezzulli, L.; Sandulli, R.; Marques, J. C.; Jørgensen, S. E.We applied a thermodynamic and network analysis on the micro and meio-benthic community in a wide coastal area of the southern Adriatic Sea in order to assess ecosystem health and to identify useful descriptors of environmental quality. The analysis of the micro and meio-benthic system in terms of organic matter, bacteria, microphytobenthos and meiofauna reflected changes occurring in the trophic state of benth...
Temporal and spatial change of exergy and ascendency in different benthic marin...
Fabiano, M.; Vassallo, P.; Vezzulli, L.; Salvo, V. S.; Marques, J. C.Holistic indicators such as exergy and ascendency have been widely employed to assess the health of ecosystems given by their structure, function and organization. In this study we calculate the exergy, specific exergy and ascendency for the microbenthic loop that represents a major sub-system within the marine food chain. The analysis of the microbenthic loop investigated in terms of organic matter, bacteria, ...
Effects of mercury on the arterial blood pressure of anesthetized rats
Rossoni,L.V.; Amaral,S.M.C.; Vassallo,P.F.; França,A.; Oliveira,E.M.; Varner,K.J.; Mill,J.G.; Vassallo,D.V.The available data suggests that hypotension caused by Hg2+ administration may be produced by a reduction of cardiac contractility or by cholinergic mechanisms. The hemodynamic effects of an intravenous injection of HgCl2 (5 mg/kg) were studied in anesthetized rats (N = 12) by monitoring left and right ventricular (LV and RV) systolic and diastolic pressures for 120 min. After HgCl2 administration the LV systol...
The left ventricular contractility of the rat heart is modulated by changes in ...
Vassallo,P.F.; Stefanon,I.; Rossoni,L.V.; Tucci,P.J.F.; Vassallo,D.V.Myocardial contractility depends on several mechanisms such as coronary perfusion pressure (CPP) and flow as well as on <FONT FACE="Symbol">a</font>1-adrenoceptor stimulation. Both effects occur during the sympathetic stimulation mediated by norepinephrine. Norepinephrine increases force development in the heart and produces vasoconstriction increasing arterial pressure and, in turn, CPP. The contribution of ea...
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