On the Behavior of Micellar Solutions in Tangential Ultrafiltration Using Mineral Membranes.

Tangential ultrafiltration associated with the technology of mineral membrane is expected to offer several advantages compared to stirred cell ultrafiltration (often used at the laboratory level): (i) easier operating and cleaning procedures; (ii) better resistance to corrosion; (iii) reduced concentration polarization effects. The behavior of surfactant micelles, which can be used as the extracting phase in such processes, has been given little attention so far. The present work was aimed at investigating the behavior of different kinds of surfactants from the viewpoints of the permeate flux and of the amount of surfactant passing through the membrane.

Ultrafiltration of Micellar Solutions in the Presence of Electrolytes.

Micellar extraction coupled with ultrafiltration techniques represents a potentially attractive tool for the removal of different kinds of contaminants from waste waters. Even though most industrial streams to be treated contain large amounts of electrolytes, very little is known about the behavior of micellar solutions in ultrafiltration when large amounts of salts are present. This paper is concerned with an investigation of two cationic surfactants (cetyltrimethylammonium bromide (CTAB) and cetylpyridinium chloride (CPC)) and one anionic surfactant (sodium dodecylsulfate (SDS)) in the presence of several salts occurring in specific industrial processes (carbonates and hydrogenocarbonates, nitrites, nitrates).

Acute hemodynamic effects of an antitumoral agent: elliptinium. Involvement of histamine release.

This work reports a study of cardiovascular effects of elliptinium, a recently-acquired antitumoral agent, acutely administered i.v. in the dog.

Cardiac and vascular effects of elliptinium in guinea pigs. Involvement of a histaminergic mechanism.

This work reports a study of the effects of elliptinium on heart rate, arterial blood pressure and capillary permeability in guinea-pigs. The variations in capillary permeability are determined by spectrophotometric assay of skin Evans blue. Elliptinium induces dose-independent tachycardia and dose-related hypotension.

[Cardiovascular effects of elliptinium. The mechanism of action].

The effects of elliptinium were studied: Firstly, in the dog, in comparison with the effects of histamine, on heart rate and arterial blood pressure. Secondly, in guinea-pig isolated atria. When smaller doses were used (0.