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We investigated the importance of ray tissue for the strength of living beech trees (Fagussylvatica L.). Observations on trees grown under controlled radial tensile loads and technological tests on transverse strengths as well as comparisons among radially stressed parts of trees in nature with control samples indicate that rays are a mechanically functional and adaptive tissue in the transverse plane of living trees.
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Burgert, I., Bernasconi, A. & Eckstein, D. Evidence for the strength function of rays in living trees. Holz als Roh- und Werkstoff 57, 397–399 (1999). https://doi.org/10.1007/s001070050367
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DOI: https://doi.org/10.1007/s001070050367