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Investigation of Sea-surface Microlayer and Phytoplankton Culture Samples by Monolayer Techniques and Brewster Angle Microscopy

Zlatica Kozarac ; Center for Marine and Environmental Research, Ruđer Bošković Institut, P.O.B. 1016, HR-10001 Zagreb, Croatia
Dietmar Möbius ; Max-Planck-Institut für biophysikalische Chemie, Postfach 2841, D-37018 Göttingen, Germany
Daniela B. Spohn ; Max-Planck-Institut für biophysikalische Chemie, Postfach 2841, D-37018 Göttingen, Germany

Sažetak

Natural samples of sea-surface microlayer and phytoplankton culture samples have been studied by monolayer techniques and by Brewster angle microscopy (BAM). Surface pressure-area (π-A) and surface potential-area (ΔV-A) isotherms have been measured. Simultaneously BAM video images have been recorded.
The π-A isotherms, as well as BAM images of monolayers of dipalmitoyl phosphatidylcholine (DPPC), dimyristoylphosphatidic acid (DMPA) and dioctadecyldimethyl ammonium bromide (DOMA) spread on an aqueous subphase containing a sample of phytoplankton culture show that surface active substances released by phytoplankton influence molecular organization as well as domain morphology of the lipid monolayers.
The sea-surface microlayer sample spread at the air/water interface exhibits the characteristics of a liquid expanded phase without undergoing a phase transition. The BAM images taken from this film depend on surface pressure, showing at low surface pressures liquid condensed domains surrounded by a liquid expanded phase, and at higher surface densities only a liquid condensed phase.

Ključne riječi

Hrčak ID:

132348

URI

https://hrcak.srce.hr/132348

Datum izdavanja:

4.5.1998.

Posjeta: 743 *