I N T R O D U C T I O N Optical diffraction and filtering of electron micrographs offers an objective method for analysing periodic structures. Because the preservation of detail in electron micrographs usually is not perfect, many micrographs must be examined and assessed to identify images suitable for analysis. I t is useful to have an instrument that allows one to survey many dozens of elec...

Quantitative structural analysis from electron micrographs of biological macromolecules inevitably requires the synthesis of data from many parts of the same micrograph and, ultimately, from multiple micrographs. Higher resolutions require the inclusion of progressively more data, and for the particles analyzed to be consistent to within ever more stringent limits. Disparities in magnification ...

Influenza virus, Santa Claus, or a mouse playing tennis? We have all lain on our backs, looked up at the clouds, and imagined all sorts of creatures there. Sometimes the same may happen with electron microscopy, and I recently produced this electron micrograph of an influenza virus. My colleagues and I have seen it variously as a caveman wielding a club, John McEnroe, Santa Claus, and a mouse p...

We have used the techniques of optical diffraction and optical filtering to study electron micro­ graphs of myofibrils and of paracrystals of myofibrillar proteins. The optical diffraction patterns provide information about periodic structure in the micrographs, and sometimes may reveal periodicities not apparent to the eye. We compare the optical diffraction patterns with the X-ray diffraction...

Recent electron micrograph measurements of bacterial dimensions in exponentially growing cultures of Escherichia coli support a model of bilinear increase in cell surface area and volume, with a sharp doubling in growth rate at a discrete age during the cell cycle. The results also indicate coordinate regulation of increase of surface area and volume.

The magnetite (Fe3O4) – agar nanocomposite was prepared by co-precipitation of Fe (III) and Fe (II) ions for the first time. The obtained samples were characterized by x-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. FT-IR results confirm the formation of Fe3O4 nanoparticles...

in this study, confined impinging liquid jets are used to produce nanoparticles of carbamazepine (cbz). the effect of operating parameters, such as the kind of solvent,cbz concentration, flow rate of solution and antisolvent on particle size, are experimentally investigated. the scanning electron micrograph (sem) photomicrographs show that nanodrug with smaller particle is achievable by using s...