Determining the fibrillar orientation of bast fibres with polarized light microscopy: the modified Herzog test (red plate test) explained.
Bottom Line: The test has the reputation for never producing false results, but also for occasionally not working.However, so far, no proper justification has been provided in the literature that the 'no false results' assumption is really correct and it has also not been clear up till now, why the method sometimes does not work.We also provide an explanation for why the Herzog test sometimes does not work: According to our model, the Herzog test will not work if none of the three distinct layers in the secondary cell wall is significantly thicker than the others.
Affiliation: Department of Physics and Technology, University of Bergen, Bergen, Norway.Show MeSH
Mentions: A plot of is shown in Figure 8, demonstrating how varies with ϕ and △ as well as α. As is clearly seen, attains its minimum for Thus, the main result from these calculations is that for all retardations and fibrillar angles of a fibre, minimum intensity is expected to occur at .
Affiliation: Department of Physics and Technology, University of Bergen, Bergen, Norway.