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THE EFFECT OF LIGHT ON THE SPAWNING OF CIONA INTESTINALIS.
The action spectrum for spawning suggests cytochrome c as a chromophore in Ciona intestinalis, and the animals spawn when returned to the dark after a short illumination period, provided they have received enough energy.
Seed mycoflora of soybeans relative to fungal interactions, seedling emergence, and carry over of pathogens to subsequent crops.
PHOTOREVERSAL OF NUCLEAR AND CYTOPLASMIC EFFECTS OF SHORT ULTRAVIOLET RADIATION ON PARAMECIUM CAUDATUM
The data support the view that nuclear effects of UV are readily photoreversed but cytoplasmic effects are not, because it is absorbed superficially as indicated by unilateral fluorescence in UV.
The effect of radiations on galactozymase formation in yeast.
EVIDENCE FOR THERMAL REACTIONS FOLLOWING EXPOSURE OF DIDINIUM TO INTERMITTENT ULTRAVIOLET RADIATIONS
- A. C. Giese, D. Shepard, J. Bennett, A. Farmanfarmaian, C. L. Brandt
- MedicineThe Journal of General Physiology
- 20 November 1956
An increase of injury with rise of temperature and with increase of dark period clearly indicates that injury depends on thermochemical reactions following the absorption of UV in Didinium, and the most reasonable assumption is that a similar conclusion applies to other organisms as well.
PHOTOREACTIVATION IN COLPIDIUM COLPODA
Colpidium colpoda, grown on a single strain of bacteria in 0.05% lettuce medium buffered at pH 7, was irradiated with various wave-lengths of monochromatic ultraviolet (UV) light and the retarding effects were progressively greater with increasing dosages until division of treated colpidia was prevented.
THE EFFECT OF NUTRITIONAL STATE ON PHOTOREVERSAL OF ULTRAVIOLET INJURIES IN DIDINIUM NASUTUM
The sensitivity of Didinium to UV did not change essentially during the 5 month period over which tests were made and the theoretical implications of the results are considered.
The Effects of Starvation on Photoreactivation in Colpidium colpoda
- A. C. Giese, C. L. Brandt, C. Jacobson, D. Shepard, R. T. Sanders
- BiologyPhysiological Zoology
- 1 January 1954
The effects upon photoreversal of varied environmental conditions and of postirradiation nutritive conditions have been studied.
QUANTUM RELATIONS IN PHOTOREACTIVATION OF COLPIDIUM
- A. C. Giese, R. Iverson, D. Shepard, C. Jacobson, C. L. Brandt
- BiologyThe Journal of general physiology
- 20 November 1953
Photoreactivation seems to be a balance between the slight injurious effect produced by the visible light or UV of long wave lengths and the injury produced by short wave length UV.