Propaganda and democracy

We are surrounded by communication of many kinds whose aim is to persuade rather to convince, tomanipulare rather than to reason. Advertising and much public discourse is like this. How should we react to this fact? Perhaps even more importantly: What does this fact mean abour modern society? Not ali persuasion is regrettable orto be disapproved. Not ali persuasion is propaganda. And perhaps not even ali propaganda is necessarily bad. This last point was the focus of a controversy between W. E. B. Du Bois, who held that propaganda could be used for good, and Alain Locke, who held that ali propaganda corrupts our thinking. My own view is that propaganda can be used for good, but Locke was perfectly right to be worried about it.; Estamos rodeados de muchos tipos de comunicación, cuya finalidad es persuadir antes que convencer, manipular antes que razonar. La publicidad y gran parte del discurso público es así. ¿Cómo deberíamos reaccionar a este hecho? Quizá más importante aún: ¿qué dice este hecho acerca de la sociedad moderna? No toda persuasión es lamentable o debería desaprobarse. No toda persuasión es propaganda. E incluso quizá no toda propaganda es necesariamente mala. Este último punto centró la controversia entre W.E.B. du Bois, quien sostenía que la propaganda podría utilizarse para un buen fin, y Alain Locke, quien sostenía que toda propaganda corrompe el pensamiento. Mi propio punto de vista es que la propaganda puede utilizarse para un buen fin, pero que Locke tenía razón al preocuparse por ella

Fabrication of an in-plane SU-8 cantilever with integrated strain gauge for wall shear stress measurements in fluid flows.

We present a cantilever fabricated from the polymer SU-8 for the measurement of wall shear stress in fluid flows. The pressure induced deflection of the cantilever, measured using a calibrated and integrated nichrome strain gauge, can be related to the wall shear stress on the surface. The initial degree of curvature of the cantilever can be controlled via the exposure dose, which allows a small positive deflection to be achieved, and so minimises the intrusion into the flow. Wind tunnel testing results show a sensitivity greater than 2.5 mV/Pa, with a shear stress of 0.38 Pa and excitation of 1 V

A dedicated haem lyase is required for the maturation of a novel bacterial cytochrome c with unconventional covalent haem binding

In bacterial c-type cytochromes, the haem cofactor is covalently attached via two cysteine residues organized in a haem c-binding motif. Here, a novel octa-haem c protein, MccA, is described that contains only seven conventional haem c-binding motifs (CXXCH), in addition to several single cysteine residues and a conserved CH signature. Mass spectrometric analysis of purified MccA from Wolinella succinogenes suggests that two of the single cysteine residues are actually part of an unprecedented CX15CH sequence involved in haem c binding. Spectroscopic characterization of MccA identified an unusual high-potential haem c with a red-shifted absorption maximum, not unlike that of certain eukaryotic cytochromes c that exceptionally bind haem via only one thioether bridge. A haem lyase gene was found to be specifically required for the maturation of MccA in W. succinogenes. Equivalent haem lyase-encoding genes belonging to either the bacterial cytochrome c biogenesis system I or II are present in the vicinity of every known mccA gene suggesting a dedicated cytochrome c maturation pathway. The results necessitate reconsideration of computer-based prediction of putative haem c-binding motifs in bacterial proteomes