ThedynamicviscosityofaeratedgelsandgelswasmeasuredusinganultrasonicviscometerUnipantype505 (UNIPAN,Warsaw,Poland).Measurementsoftheviscosity wereperformedat25C.Beforeeachmeasurement,the ultrasoundsignallevelwaschecked.Themeasuringprobe wasimmersedcompletelyinthegel.Theresultswereread inunitsofmPas¥g/cm3.Allmeasurementswereperformed insixreplicates