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Author Gall, D.
Title Die Messung circadianer Strahlungsgrößen Type Journal Article
Year 2004 Publication Technische Universität Illmenau Abbreviated Journal (up)
Volume Issue Pages 17
Keywords Human Health
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Notes Approved no
Call Number LoNNe @ kagoburian @ Serial 754
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Author Hastings, J. W.; B. M. Sweeney
Title A persistent diurnal rhythm of luminescence in Ganyaulax Polyedra Type Journal Article
Year 1958 Publication The Biological Bulletin Abbreviated Journal (up)
Volume 115 Issue 3 Pages 440-458
Keywords Animals
Abstract 1. The characteristics of a persistent diurnal rhythm of luminescence in the dinoflagellate Gonyaulax polyedra are described.

2. The light emission upon stimulation, from cultures which are kept in alternating light and dark periods of 12 hours each (= LD), is 40 to 60 times greater during the dark period than during the light period. If LD cultures are placed in continuous dim light (100 foot-candles) a diurnal rhythm of luminescence persists. If LD cultures are placed in continuous bright light (> 1500 foot-candles) the rhythm is damped, and no fluctuations occur in the amount of light emitted.

3. The occurrence of rhythmicity is not dependent upon prior exposure to LD conditions. Cultures which have been grown in bright light for as long as one year show a diurnal rhythm when placed in constant dim light or darkness. Cultures kept in alternating light and dark cycles which are greater or less than 24 hours similarly show a diurnal rhythm when returned to constant dim light or darkness. “Training” or “memory” is therefore not involved.

4. The rhythm can be entrained by light-dark cycles which are different from 24 hours. The period of the luminescence rhythm corresponds to light-dark cycles which have periods ranging between 12 and 32 hours.

5. The period of the rhythm is always close to 24 hours when the cells are kept under constant conditions, but it varies slightly depending upon the temperature and light intensity.

6. The phase of the rhythm under constant conditions is related to the time at which the previous lightand dark periods occurred. Moreover, the phase may be shifted by interposing a non-repeated exposure to a different light intensity. The number of hours by which the phase is shifted in such an experiment is dependent upon the intensity and duration of the light treatment, and the time in the cycle when it is administered.

7. Exhaustive mechanical stimulation does not alter the phase of the rhythm.

8. When cultures having different phases were mixed, no evidence was found which would indicate that there was any interaction between them.

9. The evidence presented indicates that the diurnal rhythmicity is the consequence of a basic oscillatory mechanism which is inherent to the cell.
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Call Number LoNNe @ kagoburian @ Serial 759
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Author IDA
Title Dark-Sky Park Program Type Journal Article
Year 2006 Publication edited by International Dark-Sky Association Abbreviated Journal (up)
Volume Issue Pages 11
Keywords Skyglow
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Call Number LoNNe @ kagoburian @ Serial 763
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Author IDA
Title Dark Sky Community Criteria Type Journal Article
Year 2013 Publication edited by International Dark-Sky Association Abbreviated Journal (up)
Volume Issue Pages
Keywords Skyglow
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Call Number LoNNe @ kagoburian @ Serial 764
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Author Immelmann, K.; K. R. Scherer; C. Vogel; P. Schmoock,
Title Psychobiologie. Grundlagen des Verhaltens Type Journal Article
Year 1988 Publication Psychobiologie. Grundlagen des Verhaltens Abbreviated Journal (up)
Volume Issue Pages 888
Keywords Human Health; Animals
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Notes Approved no
Call Number LoNNe @ kagoburian @ Serial 765
Permanent link to this record