Crystallinity And Ultrastructure Of Ammoniated Wood Part II. Ultrastructure


  • R. A. Parham


Cell-wall layering, pits, and lumen surfaces of loblolly pine wood were examined in the electron microscope for changes due to ammonia treatment. Both normal and compression wood cell walls were crimped circumferentially after ammoniation as evidenced by deformations in the S3 and/or S1 layers. Such crimping would imply a cell-wall consolidation due to shrinkage in the S2, and the overall phenomenon was probably responsible for the increase in X-ray crystallinity of the same material. Other ultrastructural changes included definite pit aspiration and the deposition of an incmstant-like substance onto both pit structure and lumen surfaces. This incrustant was probably some residual wood extractive or other wall constituent partially solubilized by condensed ammonia in the cell.


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