• Corpus ID: 51775228

T H E EFFECT OF NUTRITIONAL STATE ON PHOTOREVERSAL OF ULTRAVIOLET INJURIES IN DIDINIUM NASUTUM* BY C. L. BRANDT, D. C. SHEPARD, Am) A. C. GIESE

@inproceedings{Nasutum2003THE,
  title={T H E EFFECT OF NUTRITIONAL STATE ON PHOTOREVERSAL OF ULTRAVIOLET INJURIES IN DIDINIUM NASUTUM* BY C. L. BRANDT, D. C. SHEPARD, Am) A. C. GIESE},
  author={Didinium Nasutum and C. L. Brandt and Douglas Shepard and Arthur Charles Giese},
  year={2003}
}

• Didinium Nasutum, C. L. Brandt, +1 author A. C. Giese
• Published 2003
• Biology

Starvation increases the susceptibility of Paramecium and Colpidium to ultraviolet (UV) radiations (Giese and Reed, 1940; Giese et al., 1954). Injury to starved colpidia is found to be less readily photoreversed than that to well fed animals, eight times as many quanta of blue light per quantum UV being required for maximal photoreversal (Giese et a/., 1953). Refeeding them with bacteria after UV but before blue light has little effect upon the degree of photoreversal (Giese eta/., 1954). Since it is difficult to tell how much food a bacterial feeder like Colpidium has ingested and how soon the food has been metabolized, the effect of feeding on UV injury and its photoreversal was studied with Didinium nasutura, a carnivorous ciliate. This species was chosen because its food intake can be easily observed under the microscope and regulated. It normally eats paramecia which can be grown under fairly controlled conditions. Therefore if the number of paramecia supplied to a didlnium is controlled, the quantity and quality of food intake is known. The effect of the nutritional state upon susceptibility to UV and on photoreversal of UV injury by visible light is reported below.