The processes within angiosperm wood are in principal the same, but it was at first by no means simple to recognize the logical connection. Pine wood is a typical object of every botanical ground course. These three perspectives can be combined in a diagram . For some years now has scanning electron microscopy been used in the examination of the three-dimensional structure of wood. The veneers often used in the fabrication of furniture are made from such sections.
Annual rings are well-suited for the determination of the trees' ages.
As we have already seen, is their thickness dependent on many factors. During the last years has the 14 C method been established. 14 C has a half-life of 5770 years. No new carbon is incorporated into an already finished compound so that its 14 C content sinks continuously. The xylem of gymnosperms has few or no parenchyma cells at all.