Adenylate concentration and energy charge in different thallus regions and after UV radiation in brown, red and green algae

A method was developed to extract adenine nucleotides AMP, ADP, and ATP from marine macroalgal tissue to gain information on the cellular energy charge. Quantification was carried out by high performance liquid chromatography (HPLC). Three species from the rocky shore of the island of Helgoland (German Bight) were examined: Laminaria saccharina (Phaeophyta), Chondrus crispus (Rhodophyta), and Ulva lactuca (Chlorophyta). In L. saccharina and C. crispus, the adenylate energy charge (AEC) was determined in different thallus regions. AEC varied in relation to tissue age and function. Higher AEC values typically occurred in thallus regions with meristematic activity. Furthermore, L. saccharina and U. lactuca were exposed to UV-A and elevated UV-B radiation. The AEC was calculated and the maximal quantum yield of photosystem II (Fv/Fm) was determined as indicators for UV stress. In both species, the AEC remained at high values (0.72 ± 0.04), while Fv/Fm dropped rapidly. The results show that the photosynthesis of the phaeophyte is more resistant to UV radiation than the chlorophyte.

Movable-bed laboratory experiments comparing radiation stress and energy flux factor as predictors of longshore transport rate /

"April 1981."

A summary of accidents and incidents involving radiation in atomic energy activities, June 1945 through December 1955 /

"TID-5360; Subject category: Health and Biology."

A review of information on the gamma energy radiation rate from fission products, and its significance for studies of radioactive fallout /

"April 24, 1959."

The statement of Dr. W.F. Libby before Special Subcommittee on Radiation, Joint Committee on Atomic Energy public hearings on the biological and environmental effects of nuclear war.

"Health and Safety."

Biological effects of a nuclear attack : presented at the Hearings on the Biological and Environmental Effects of Nuclear War, before the Special Subcommittee on Radiation, Joint Committee on Atomic Energy /

"Radiation Effects of Weapons Branch, AEC."

The nature of radioactive fallout and its effects on man : Hearings before the Special Subcommittee on Radiation of the Joint Committee on Atomic Energy, Congress of the United States, Eighty-fifth Congress, first session ...

Include bibliographies.

Radiation measurements and energy conversion,

"Part of the National Science Foundation new laboratory equipment development project; NSF grant 17701."

Effect of nuclear radiation on organic materials, specifically magnet insulations in high-energy accelerators /

"March 1965."

Graphs of calculations of energy deposition and air fluorescence from radiation produced by a nuclear explosion in space /

"Part of this work done under ARPA Order 631, Program Code No. 5820."

The nature of radioactive fallout and its effects on man. Summary. Hearings before the Special Subcommittee on Radiation of the Joint Committee on Atomic Energy, Congress of the United States, Eighty-fifth Congress, first session: on the nature of radioactive fallout and its effect on man.

Hearings held May 27-June 7, 1957.