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  • 1
    Electronic Resource
    Electronic Resource
    Ueber isomere Dinitrophenole (1873)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 167 (1873), S. 89-117 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.18731670112
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of two-dimensional electrophoretic protein patterns using a video camera and a computer. I. The resolution power of the video camera (1983)
    Weinheim : Wiley-Blackwell
    Electrophoresis 4 (1983), S. 284-291 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The resolution power of a video camera (Hamamatsu) was investigated under the aspect of employing the camera for the densitometric evaluation of two-dimensional electrophoretic patterns of proteins. The features of the camera were tested on the illuminated glass pane of a light box and on specimens such as a blank film (X-ray film), a blank gel (polyacrylamide gel plate) and a bar raster. The digitized values were analysed by a computer. While the hardware permits a half-tone resolution from 0 (dark) to 255 (bright) grey levels, the values obtained experimentally showed that only 90 (glass pane), 70 (gel) or 60 (film) reproducible grey levels can be resolved, depending on the features of the supporting material of the two-dimensional electrophoresis pattern. The addressable spatial resolution of the camera comprises 1024 × 1024 pixels. Under experimental conditions, however, only 570 × 700 pixels were resolved. Further investigation in necessary to prove whether the resolution power of a video camera is sufficient for a precise analysis of two-dimensional protein patterns.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150040408
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  • 3
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    Selective visual processing across competition episodes: a theory of task-driven visual attention and working memory (2013)
    The Royal Society
    Details
    Publication Date: 2013-10-19
    Description: The goal of this review is to introduce a theory of task-driven visual attention and working memory (TRAM). Based on a specific biased competition model, the ‘theory of visual attention’ (TVA) and its neural interpretation (NTVA), TRAM introduces the following assumption. First, selective visual processing over time is structured in competition episodes. Within an episode, that is, during its first two phases, a limited number of proto-objects are competitively encoded—modulated by the current task—in activation-based visual working memory (VWM). In processing phase 3, relevant VWM objects are transferred via a short-term consolidation into passive VWM. Second, each time attentional priorities change (e.g. after an eye movement), a new competition episode is initiated. Third, if a phase 3 VWM process (e.g. short-term consolidation) is not finished, whereas a new episode is called, a protective maintenance process allows its completion. After a VWM object change, its protective maintenance process is followed by an encapsulation of the VWM object causing attentional resource costs in trailing competition episodes. Viewed from this perspective, a new explanation of key findings of the attentional blink will be offered. Finally, a new suggestion will be made as to how VWM items might interact with visual search processes.
    Print ISSN: 0962-8436
    Electronic ISSN: 1471-2970
    Topics: Biology
    Published by The Royal Society
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  • 4
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    Attentional selection in visual perception, memory and action: a quest for cross-domain integration (2013)
    The Royal Society
    Details
    Publication Date: 2013-10-19
    Description: For decades, the cognitive and neural sciences have benefitted greatly from a separation of mind and brain into distinct functional domains. The tremendous success of this approach notwithstanding, it is self-evident that such a view is incomplete. Goal-directed behaviour of an organism requires the joint functioning of perception, memory and sensorimotor control. A prime candidate for achieving integration across these functional domains are attentional processes. Consequently, this Theme Issue brings together studies of attentional selection from many fields, both experimental and theoretical, that are united in their quest to find overreaching integrative principles of attention between perception, memory and action. In all domains, attention is understood as combination of competition and priority control (‘bias’), with the task as a decisive driving factor to ensure coherent goal-directed behaviour and cognition. Using vision as the predominant model system for attentional selection, many studies of this Theme Issue focus special emphasis on eye movements as a selection process that is both a fundamental action and serves a key function in perception. The Theme Issue spans a wide range of methods, from measuring human behaviour in the real word to recordings of single neurons in the non-human primate brain. We firmly believe that combining such a breadth in approaches is necessary not only for attentional selection, but also to take the next decisive step in all of the cognitive and neural sciences: to understand cognition and behaviour beyond isolated domains.
    Print ISSN: 0962-8436
    Electronic ISSN: 1471-2970
    Topics: Biology
    Published by The Royal Society
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