Author:
Hoffmann P.,Singh A.,Kim Y.S.,Wi S.G.,Kim I.-J.,Schmitt U.
Abstract
Abstract
The Bremen Cog is a big ship built AD 1380 from oak
wood. After its recovery from the river Weser, the water-logged
ship's timbers were successfully stabilized using
a novel two-step polyethylene glycol (PEG) treatment. An
electron microscopic study of the patterns of degradation
and of the distribution of PEG within the Cog wood
is described. Descriptions like these do not exist for
many well known archaeological objects. SEM revealed
that in areas with extensive degradation, wood cell walls
are thinned and cells have a distorted appearance. TEM
provided evidence that the wood has been degraded primarily
by erosion bacteria. The stabilization treatment
involved impregnation first with PEG 200 and then with
PEG 3000. The SEM observations of PEG-impregnated
wood revealed that in degraded tissues all cell types are
well filled with PEG 3000. Non-degraded tissues are
impermeable to PEG 3000 and are impregnated only with
PEG 200. SEM confirmed earlier fluorescence microscopic
evidence, that PEG 200 is absorbed by the cell
walls.
Cited by
28 articles.
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