Temporal dynamics of dissolved and particulate organic carbon in the northern Adriatic Sea in relation to the mucilage events.

The accumulation of dissolved and particulate organic matter may play an important role in mucilage formation in the northern Adriatic. Distributions of dissolved and particulate organic carbon were therefore investigated during the period June 1999-July 2002, when massive mucilage events occurred: in the summer of 2000 and, to a greater extent, of 2002. The seasonal variations in dissolved organic carbon (DOC) concentrations were significant, doubling in summer (up to 150 micromol L(-1)) with respect to winter.

Chemical characterization of different typologies of mucilaginous aggregates in the Northern Adriatic Sea.

The chemical composition of mucilage aggregates found during summer 2000, 2001 and 2002 in the North Adriatic Sea depends on the nature of the organic matter during aggregation, on the environmental conditions of the site of formation and on the transformations during ageing. The mucilages were composed of organic matter, together with a significant inorganic fraction. Elemental analysis revealed 12.

Ion-exchange voltammetry and electrocatalytic sensing capabilities of cytochrome c at polyestersulfonated ionomer coated glassy carbon electrodes.

The incorporation and electrochemical behaviour of cytochrome c (Cyt C) at glassy carbon electrodes modified with the polyestersulfonated ionomer Eastman AQ 55 are examined. The presence of the polyelectrolytic coating allows the preconcentration of the protein within the polymer and the observation of the direct electrochemistry of Cyt C at the modified electrode without addition of promoters or mediators in the solutions. The dependence of voltammetric signals on typical parameters such as solution pH and nature or concentration of the supporting electrolyte supports the ion-exchange nature of the incorporation process.