La plaga de los vagabundos. Bandas salvajes por las carreteras alemanas

Durante mis peregrinaciones por las carreteras de Alemania me ha ocurrido encontrarme con grupos extraños que no se parecían a otro alguno. Y no estribaba su originalidad precisamente en el calzón corto, las piernas desnudas ni en el morral inverosímilmente pesado que caracterizan a los “wanderers” ordinarios. Como todos los jóvenes berlineses, éstos abandonan la ciudad el sábado por la tarde y regresan en la madrugada del lune

La plaga de los vagabundos. Bandas salvajes por las carreteras alemanas

Durante mis peregrinaciones por las carreteras de Alemania me ha ocurrido encontrarme con grupos extraños que no se parecían a otro alguno. Y no estribaba su originalidad precisamente en el calzón corto, las piernas desnudas ni en el morral inverosímilmente pesado que caracterizan a los “wanderers” ordinarios. Como todos los jóvenes berlineses, éstos abandonan la ciudad el sábado por la tarde y regresan en la madrugada del lune

For a libertarian communism

In this collection, written between the 1950s and 1980s and published for the first time in English, Guerin not only provides a critique of the socialist and communist parties of his day, he analyses some of the most fundamental and pressing questions with which all radicals must engage. He does this by revisiting and attempting to draw lessons from the history of the revolutionary movement from the French Revolution, through the conflicts between anarchists and Marxists in the International Workingmen's Association and the Russian and Spanish revolutions, to the social revolution of 1968

Thermally stable low current consuming gallium and germanium chalcogenides for consumer and automotive memory applications

The phase change technology behind rewritable optical disks and the latest generation of electronic memories has provided clear commercial and technological advances for the field of data storage, by virtue of the many well known attributes, in particular scaling, cycling endurance and speed, that chalcogenide materials offer. While the switching power and current consumption of established germanium antimony telluride based memory cells are a major factor in chip design in real world applications, often the thermal stability of the device can be a major obstacle in the path to the full commercialisation. In this work we describe our research in material discovery and characterization for the purpose of identifying more thermally stable chalcogenides for applications in PCRAM

Retrieval Failure Contributes to Gist-Based False Recognition

People often falsely recognize items that are similar to previously encountered items. This robust memory error is referred to as gist-based false recognition. A widely held view is that this error occurs because the details fade rapidly from our memory. Contrary to this view, an initial experiment revealed that, following the same encoding conditions that produce high rates of gist-based false recognition, participants overwhelmingly chose the correct target rather than its related foil when given the option to do so. A second experiment showed that this result is due to increased access to stored details provided by reinstatement of the originally encoded photograph, rather than to increased attention to the details. Collectively, these results suggest that details needed for accurate recognition are, to a large extent, still stored in memory and that a critical factor determining whether false recognition will occur is whether these details can be accessed during retrieval.Psycholog

Interactions Between Visual Attention and Episodic Retrieval: Dissociable Contributions of Parietal Regions During Gist-Based False Recognition

The interaction between episodic retrieval and visual attention is relatively unexplored. Given that systems mediating attention and episodic memory appear to be segregated, and perhaps even in competition, it is unclear how visual attention is recruited during episodic retrieval. We investigated the recruitment of visual attention during the suppression of gist-based false recognition, the tendency to falsely recognize items that are similar to previously encountered items. Recruitment of visual attention was associated with activity in the dorsal attention network. The inferior parietal lobule, often implicated in episodic retrieval, tracked veridical retrieval of perceptual detail and showed reduced activity during the engagement of visual attention, consistent with a competitive relationship with the dorsal attention network. These findings suggest that the contribution of the parietal cortex to interactions between visual attention and episodic retrieval entails distinct systems that contribute to different components of the task while also suppressing each other.Psycholog

Comparison of the functional properties of trimeric and monomeric CaiT of Escherichia coli

Secondary transporters exist as monomers, dimers or higher state oligomers. The significance of the oligomeric state is only partially understood. Here, the significance of the trimeric state of the L-carnitine/gamma-butyrobetaine antiporter CaiT of Escherichia coli was investigated. Amino acids important for trimer stability were identified and experimentally verified. Among others, CaiT-D288A and -D288R proved to be mostly monomeric in detergent solution and after reconstitution into proteoliposomes, as shown by blue native gel electrophoresis, gel filtration, and determination of intermolecular distances. CaiT-D288A was fully functional with kinetic parameters similar to the trimeric wild-type. Significant differences in amount and stability in the cell membrane between monomeric and trimeric CaiT were not observed. Contrary to trimeric CaiT, addition of substrate had no or only a minor effect on the tryptophan fluorescence of monomeric CaiT. The results suggest that physical contacts between protomers are important for the substrate-induced changes in protein fluorescence and the underlying conformational alterations