The "square" bacterium, first described by Walsby from brine collected at the Red Sea shore [A. E. Walsby, Nature (London) 283:69-71, 1980] was examined by electron microscopy. The cells appeared as flat rectangular boxes in scanning electron micrographs. In sections and freeze-fracture preparation, the edges looked more rounded. The thickness apparently remains constant as the cells grow and d...

An iterative Fourier method is applied to solving and refining the electron density profile projected into the line perpendicular to a membrane surface. Solutions to the continuous X-ray scattering pattern derived from swelling of multilayer systems or from membrane dispersions can be obtained by this technique. The method deals directly with the observed structure factors and does not rely on ...