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Web Figure 15.5.B
Apparatus for measuring the multiaxial extensibility of Nitella cell walls. The pressure source is a compressed air tank. Air passes through high-pressure tubing into a manometer and from there into a mercury-filled pipette glued to the open end of a Nitella cell wall cylinder. A living internode is maintained at the distal end. The wall is immersed in a perfusion chamber with a glass window. Displacement of resin beads attached to the surface of the wall is measured with a horizontally oriented microscope. The inset shows a view of a mercury-inflated cell wall cylinder with marker beads attached as seen through the traveling microscope. (Photo from L. Taiz.)
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