Ultrastructure of the erosion patterns of bacterial decay of treated and untreated timbers exposed in natural environments

Venkatasamy R., . and Jones E.B.G., . and Moss S.T., . (1990) Ultrastructure of the erosion patterns of bacterial decay of treated and untreated timbers exposed in natural environments. [Proceedings Paper]

Erosion was found to be the most common form of bacterial decay affecting untreated and copper-chrome-arsenic-treated timbers exposed in natural environments. Two types were observed : narrow and wide erosion zones. To investigate the ultrastructure of these two types of bacterial wood decay a range of untreated and CCA-treated timbers were exposed in seawater freshwater and of these two types of bacterial wood decay a range of untreated and CCA-treated timbers were exposed in seawater freshwater and soil. Using the high resolution of the scanning and transmission electron microscopes SEM and TEM coupled with double staining techniques of this sections the ultrastructure of the patterns was examined. The role of extracellular mucilage and the distribution of enzymes in decay were also assessed. Narrow erosion zones were invariably confined to the immediate vicinity of the causative bacteria. Wide erosion zones generally irregular in pattern were wider and at a distance from the causative microorganism. Both untreated and CCA-treated timbers were equally subject to the erosion type of bacterial decay. However treated timbers usually contained granular electron-opaque particles within the decayed zones. These were believed to be immobilised preservative

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Abstract

Erosion was found to be the most common form of bacterial decay affecting untreated and copper-chrome-arsenic-treated timbers exposed in natural environments. Two types were observed : narrow and wide erosion zones. To investigate the ultrastructure of these two types of bacterial wood decay a range of untreated and CCA-treated timbers were exposed in seawater freshwater and of these two types of bacterial wood decay a range of untreated and CCA-treated timbers were exposed in seawater freshwater and soil. Using the high resolution of the scanning and transmission electron microscopes SEM and TEM coupled with double staining techniques of this sections the ultrastructure of the patterns was examined. The role of extracellular mucilage and the distribution of enzymes in decay were also assessed. Narrow erosion zones were invariably confined to the immediate vicinity of the causative bacteria. Wide erosion zones generally irregular in pattern were wider and at a distance from the causative microorganism. Both untreated and CCA-treated timbers were equally subject to the erosion type of bacterial decay. However treated timbers usually contained granular electron-opaque particles within the decayed zones. These were believed to be immobilised preservative

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	MADERA
AGROVOC Term:	PUDRICION DE LA MADERA/ EROSION
AGROVOC Term:	HIDROLISIS ENZIMATICA
AGROVOC Term:	CONSERVACION DE LA MADERA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/15076

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