4 research outputs found
Comparative morphology of the postpharyngeal gland in the Philanthinae (Hymenoptera, Crabronidae) and the evolution of an antimicrobial brood protection mechanism
Screening analyses of pinosylvin stilbenes, resin acids and lignans in Norwegian conifers
The content and distribution of stilbenes and resin acids in Scots pine (Pinus
sylvestris) and spruce (Picea abies), sampled in central Norway, have been examined.
The contents of pinosylvin stilbenes in pine heartwood/living knots were 0.2-2/2-8 %
(w/w). No stilbenes could be detected in spruce (Picea abies). The resin acid contents of
pine sapwood/heartwood and knots were 1-4 and 5-10 % (w/w), respectively. Minor
amounts of resin acids (<0.2/<0.04 %w/w) were identified in spruce wood/knots. The
lignan content in knots of Norwegian spruce was 6.5 % (w/w). Diastereomerically pure
hydroxymatairesinol (HMR, 84 % of total lignans) was readily isolated from this source
since only minor quantities (2.6 % of total lignans) of the allo-HMR diastereomer was
detected. Insignificant amounts of lignans were present in the sapwood. Lignans could
not be detected in the sapwood or knots of Norwegian sallow (Salix caprea), birch
(Betula pendula) or juniper (Juniperus communis)