Instances of presumed plesiobiosis (compound nests) of Lasius umbratus (Nyl.) with Formica sanguinea Latr. and of L. umbratus with Polyergus rufescens (Latr.) are presented. At the time of nuptial flights, on the surface of nests of the dulotic species (both with enslaved Formica cinerea Mayr workers) appeared young queens of a given slave-keeper and queens of L. umbratus; local workers of F. sanguinea and (or) of F. cinerea treated them in the same way. The phenomenon was observed from 1992 to 1995 near Puławy (S-E Poland).
The paper is devoted to enslavement of adult Formica cinerea cinerea Mayr workers by Formica sanguinea Latr., a phenomenon hitherto unknown under natural conditions. Suc enslavement follows periodic invasions and temporary occupation of nests of slave species by F. sanguinea. During the occupation of their nest, some F. cinerea workers join the occupants colony. The studies were made m Poland and in Finland between 1994 and 1996.
The effect of milk pasteurisation temperature on the quality and keeping quality of agglomerated whole milk powder with and without an addition of lecithin was investigated. The influence of water content in the milk powder on the qualitative properties of whole lecitihin-treated milk powder during the prosess of agglomeration was studied as well.