Fourier transform imaging, intensity profiling

Fig. 57a. A typical multilayered cloth made cf potassium tartaric amide 31b at pH 5. Its observed physical shape is fortuitous. (Negative stain, uranyl acetate 1%). b Freeze-etching erf a similar multilayer made of the sodium salt 31a. At higher magnification (below), the bilayer profiles become visible (Pt/C shadowed), c Fiber pattern of 31a. (Negative stain, uranyl acetate 1%). d Digitized area of the fiber bundle taken from (c). e Fourier transform of the input image from (d), as obtained by calculating the reciprocal space frequencies (x-y exchanged). Two intense spots yield a periodical pattern of 38.78 A [376]...

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