Massimo Arnoldi

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We report a study of the deformability of a bacterial wall with an atomic force microscope (AFM). A theoretical expression is derived for the force exerted by the wall on the cantilever as a function of the depths of indentation generated by the AFM tip. Evidence is provided that this reaction force is a measure for the turgor pressure of the bacterium. The(More)
Atomic force microscopy (AFM) in aqueous solution was used to investigate native nacre of the marine snail Haliotis laevigata on the microscopic scale and the interaction of purified nacre proteins with calcium carbonate crystals on the nanoscopic scale. These investigations were controlled by scanning electron microscopy (SEM), light microscopy (LM) and(More)
You get a raise on 1 March but the system doesn’t find out about it until mid-May. In the meantime, who knows what happens? Reconciling these two time lines, world time and system time, is one of the most difficult problems to solve in writing information systems. Many of the actions in business are irreversible. It is complicated and expensive to take an(More)
Abstract Abstract The article begins with a brief history of anthropological collections of African material culture at the Smithsonian from the 1860's to the present. It, then, analyses the history of permanent African exhibits at the Smithsonian and the relationship of each exhibit to specifie anthropological theories. The museum's first permanent exhibit(More)
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