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  • 1970-1974  (7)
  • 1935-1939
  • 1974  (7)
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Materialart
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  • 1970-1974  (7)
  • 1935-1939
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    The Recuperative Effects of REM Sleep and Stage 4 Sleep on Human Performance After Complete Sleep Loss: Experiment 1 (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Psychophysiology 11 (1974), S. 0 
    Details
    ISSN: 1469-8986
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Psychologie
    Notizen: Twelve young (17–21 yrs) male Navy recruits volunteered for a sleep loss study. After 4 baseline days, the Ss were completely deprived of sleep for 2 days and nights. Next followed an experimental phase of 2 days and nights after which all Ss received 2 nights of uninterrupted sleep.During the experimental phase, the 4 Ss in the REM-deprived group were aroused whenever they showed signs of REM sleep. The 4 Ss of the stage 4-deprived group were aroused whenever they showed signs of entering stage 4 sleep, and the 4 Ss of the Control group had uninterrupted sleep.All tests (speed and accuracy of addition, speed and accuracy of self-paced vigilance, errors of omission in experimenter paced vigilance, immediate recall of word lists, and mood) showed significant impairment after the first night of complete sleep loss. But during the experimental (sleep-stage-deprivation) and recovery phases, all three groups showed equal rates of recovery.Depriving the S of stage REM or stage 4 during recovery sleep does not affect the recuperation rate. Frequent arousals (50–100 per night) also do not impair recovery. The amount of sleep is probably more important than the kind of sleep.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1469-8986.1974.tb00834.x
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  • 2
    Digitale Medien
    Digitale Medien
    Interaction of REM Deprivation and Stage 4 Deprivation With Total Sleep Loss: Experiment 2 (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Psychophysiology 11 (1974), S. 0 
    Details
    ISSN: 1469-8986
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Psychologie
    Notizen: To determine whether prior deprivation of stage REM or stage 4 sleep would potentiate the effects of total sleep loss, 7 young adult males were denied REM sleep and 7 were denied stage 4 sleep for 3 nights before 1 night of total sleep loss. Measures of autonomic and EEG activity, mood, anxiety, Rorschach CET and on several performance tasks were obtained during baseline, following stage deprivation, total sleep loss, and during recovery.There were no marked changes in any area following 3 nights of stage REM and stage 4 deprivation. The changes following total sleep loss were similar for both groups. Prior deprivation of stage REM or stage 4 did not potentiate sleep loss effects. Ss who had no stage deprivation prior to 1 night of sleep loss had more impairment following sleep loss than did the Ss of this study.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1469-8986.1974.tb00835.x
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  • 3
    Digitale Medien
    Digitale Medien
    Body Movements in Sleep During 30-Day Exposure to Tone Pulse (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Psychophysiology 11 (1974), S. 0 
    Details
    ISSN: 1469-8986
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Psychologie
    Notizen: Body movements during sleep stages 2 and REM were measured using an artifact method to determine the effects of a tone pulse given every 22 sec, 24 hrs a day, over a period of 30 consecutive days in 10 Navy recruits, aged 19 to 23. The tone pulse produced no significant increase in the number of body movements during stage 2, but it increased body movements in REM sleep to a significant but small (3 movement increase per night) extent. The percentages of body movements observed in the first 7 sec after the tone pulse in sleep stages 2 and REM were significantly higher than those observed during the epochs 8–14 and 15–21 sec, and those observed to the pseudostimulus. The tone pulse used in this study redistributed or regulated the appearance of the body movements to the proximity of the noise, but did not increase the total number of body movements which appeared to be under endogenous control.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1469-8986.1974.tb00818.x
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  • 4
    Digitale Medien
    Digitale Medien
    Iron and manganese encrustations in Recent sediments (1974)
    [s.l.] : Nature Publishing Group
    Nature 249 (1974), S. 436-437 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Fig. 1 Location of cores, C. Cl, BM1973,0,l; C2, BM1973, 0,2; C3, BM1973,0,3; C17, BM1973,0,17. 1963,544 is a British Museum valve lead sample. Fig. 2 Sedimentology of the cores, a, Orange-yellow ooze; b, layer of black manganese-encrusted tubes in light brown ooze; c, layer of brown ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/249436a0
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  • 5
    Digitale Medien
    Digitale Medien
    Montmorillonite in surface detritus (1974)
    [s.l.] : Nature Publishing Group
    Nature 249 (1974), S. 335-336 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Fig. 1 Partial track of the MV Cyclops. Solid line, UK-Japan run; broken line, Japan-UK run. Detritus samples were collected over the intervals indicated by the lines perpendicular to the track; #, central positions of sampling sites. Less is known, however, about the origin of montmorillonite. ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/249335a0
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  • 6
    facet.materialart.
    Unbekannt
    An Indifference Approach to Profit-Volume Analysis (1974)
    Menasha, Wis. : Periodicals Archive Online (PAO)
    The Accounting Review. 49:3 (1974:July) 579 
    Details
    ISSN: 0001-4826
    Thema: Wirtschaftswissenschaften
    Beschreibung / Inhaltsverzeichnis: EDUCATION RESEARCH AND ACADEMIC NOTES, ROBERT H. STRAWSER, Editor
    Notizen: Departments
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5030-1974-049-03-000024
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  • 7
    Digitale Medien
    Digitale Medien
    Splat-cooled alloys in the Ag-Sn-Cu system (1974)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 8 (1974), S. 3-10 
    Details
    ISSN: 0021-9304
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin , Technik allgemein
    Notizen: Strength, dimensional change during setting, and corrosion resistance have been measured for amalgams prepared from splat-cooled alloys of different compositions in the Ag-Sn-Cu system. The amalgam with optimum values of these properties was made from the alloy containing 60 at. % Ag, 25 at. % Sn, and 15 at. % Cu. Tensile strengths for amalgams from this alloy were about 8000 psi, dimensional change during setting near zero, and corrosion resistance was good.X-Ray diffraction showed that the γ1 and γ2 phases formed during the early stages of setting but that the γ2 phase had essentially disappeared after about 24 hr. At the latter time Cu6Sn5 was present.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jbm.820080103
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