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The optical density of human macular pigment was measured for 50 observers ranging in age from 10 to 90 years. The psychophysical method required adjusting the radiance of a 1°, monochromatic light (400–550 nm) to minimize flicker (15 Hz) when presented in counterphase with a 460 nm standard. This test stimulus was presented superimposed on a broad-band, short-wave background. Macular pigment density was determined by comparing sensitivity under these conditions for the fovea, where macular pigment is maximal, and 5° temporally. This difference spectrum, measured for 12 observers, matched Wyszecki and Stiles's standard density spectrum for macular pigment. To study variation in macular pigment density for a larger group of observers, measurements were made at only selected spectral points (460, 500 and 550 nm). The mean optical density at 460 nm for the complete sample of 50 subjects was 0.39. Substantial individual differences in density were found (ca. 0.10–0.80), but this variation was not systematically related to age.
Inhalt: I Problemstellung II Unternehmensentwicklung, Organisation und Personal 1 Offenkundige Nachteile von Bürokratie und Hierarchie 2 Veränderte Ansprüche und Bedürfnisse der Mitarbeiter III Organisation als Funktion der Unternehmensführung IV Personal als Funktion der Unternehmensführung 1 Verwaltungsperiode 2 Anerkennungsperiode 3 Integrationsperiode V Felder der Zusammenarbeit zwischen Organisation und Personal 1 Struktur und Führungsorganisation 2 Organisations- und Personalentwicklung 3 Sachmittelorganisation in Fabrik und Büro 4 Arbeitsplatzgestaltung und Raumplanung 5 Ablauforganisation VI Konsequenzen und Tendenzen VII Verzeichnis der Anmerkungen
Inhalt: 1. Einleitung 2. Das Problembehandlungsschema und die Analysekategorien 3. Korrekturtypen 3.1. Unmarkierte Ersetzung eines Bezugselements der voraufgegangenen Äußerung 3.2. Markierte Ersetzung eines Einzelelements der voraufgegangenen Äußerung 3.3. Markierte Ersetzung einer gesamten Bezugsäußerung 4. Präferenzstrukturen 5. Gemeinsamkeitsunterstellungen bei Selbst- und Fremdzuschreibungen von Verstehens- und Verständigungsproblemen
A system of descriptive categories for the notation and analysis of intonation in natural conversation is presented and discussed in relation to other systems currently suggested for incorporation in discourse analysis, The categories are based on purely auditive criteria. They differ from e.g. tonetic approaches by relying more on transcribers' and analysts' perception of the form and internal cohesiveness of contours, especially with respect to rhythmicality and/or pitch contour (gestalt). Intonation is conceived of as a relational phenomenon; the role of intonation in conversational utterances can only be analyzed by considering its co-occurrence with other properties of utterances like syntactic, semantic and discourse organizational structures and devices. In general, intonation is viewed as one signalling system contributing to the contextualization of utterances in their conversational context. A broad functional differentiation between different types of intonation categories seems plausible: Local categories like accents might fulfill mainly semantic functions, while global categories like different contour types might fulfill primarily functions with respect to the interactive coordination of activities in conversation.
Inhalt: 1. Einleitung 2. Präferenzstrukturen bei der Behandlung von Verständigungsproblemen 2.1. Selbstzuschreibung vor Fremdzuschreibung 2.2. Selbstzugeschriebene Verstehensprobleme: Referenzprobleme vor lokalen Bedeutungsverstehensproblemen vor lokalen Erwartungsproblemen 2.3. Fremdzugeschriebene Probleme: "Wortverwechslungen" vor "Irrtümern" vor Inferenz- oder Erwartungsproblemen 3. Das Imagekonzept als Erklärung: Präferenzen für die Wahrung und Pflege des Selbst- und des Fremd-Image
Sequences from natural conversations, which are in ethnomethodological conversational analysis analyzed as "other-initiated self-repair", are here described as sequences in which participants manifest and treat local problems of understanding. This approach, which takes participants' perspectives into account, shows that these sequences have a detailed internal structure: - Participants use different types of problem manifestation to signal different types of problems of understanding; syntactic and prosodic cues are used as type-differentiating devices in problem manifestation; for different types of problems different assumptions with respect to the degree of reciprocity can be reconstructed as underlying problem manifestation and problem treatment. - There is a relation of conditional relevance holding between specific types of problem manifestation and specific types of problem treatment. - Problem types are ordered in relation to each other in terms of preference structures. Thus, an analysis which takes participants' perspectives into account and which looks more closely at linguistic signalling cues allows to differentiate between various types of internal structures within so-called repair sequences.
Motivational conditions have been thus far largely neglected by contemporary theoretical approaches in knowledge psychology. The present article attempts to demonstrate the necessity for the greater integration of both. Suggestions are made regarding the choice and conceptualization of relevant motivational factors. Two possible groups of factors can be distinguished: (1) motivational factors of personality, and (2) motivational effects of action. Available theoretical approaches (e.g., the "levels of processing" approach) and examples are used to clarify the potential effects of these factors on the acquisition and representation of knowledge. Finally, a review is made of empirical studies allowing confirmatory allegations about the posited relationships between motivational factors and processes related to knowledge. This review reveals substantial research deficits on this topic.
In the isolated rat liver perfused in situ stimulation of the nerve bundles around the portal vein and the hepatic artery caused an increase of urate formation that was inhibited by the α1-blocker prazosine and the xanthine oxidase inhibitor allopurinol. Moreover, nerve stimulation increased glucose and lactate output and decreased perfusion flow. Infusion of noradrenaline had similar effects. Compared to nerve stimulation infusion of glucagon led to a less pronounced increase of urate formation and a twice as large increase in glucose output but a decrease in lactate release without affecting the flow rate. Insulin had no effect on any of the parameters studied.
Several polymerizable lipids were synthesized and polymerized to amphiphilic homopolymers and to copolymers with the help of hydrophilic comonomers. The self-organization of these polymeric lipids was investigated in monolayers and Langmuir-Blodgett multilayers. The self-organization of these polymers in model membranes is due to hydrophilic spacer groups in the amphiphilic side groups as well as to hydrophilic spacer groups in the polymer backbone. Thus, highly ordered monolayers and LB-multilayers are easily obtained.
Two studies are reported which examine the availability of scientific propositions of personality in lay conceptions of personality. It is argued from a social constructivist perspective that models of personality must derive from and refer to lay conceptions of persons. Eysenck's trait-type model of introversion-extroversion, containing specific propositions about phenotypic and genotypic differences between extraverts and introverts, was utilized as the scientific model of personality and its availability in lay conceptions of personality was examined in two studies. In the first study, subjects were presented with a genotypic characterization of either an introvert or an extravert target person and asked to infer corresponding phenotypic differences. In the second study, the inference process was reversed with subjects being asked to infer genotypic characteristics of introverts versus extraverts on the basis of phenotypic target person descriptions of the two types. Results from both studies show a high degree of accuracy in subjects' inferences, suggesting that laypersons have well-formed conceptions about personality containing 'higher-order' psychogenetic propositions corresponding to Eysenck's trait-type model. The implications of the findings for theory construction are discussed.