«3 ae Productivity in the Pacific. (UNCLASSIFIED) A cooperative contract, has been of Hawaii for research studies directed toward the utilisation and evaluation of isotope techniques for detarmining algal productivity in the tropical Pacific. Research wrk recently reported indicates that the productivity of the sea can be estimated from messurenmite of OO, fixation by sea water samples collected over a large area. These studies are of interest in yielding significant information relating to the mechanics, quantity, and rate of carbon being fixed through photosynthesis by the marine algae. ‘The results are anticipated to give ea better understanding of the potential productivity of the wom sess, and te extend the development of radioisotopes as useful tools in the stadyof biclogicsl processes. at the University of Caicago has made certain ebeervations that have in portant implicetions in regard to the body's immunological reactions. The relative time-pattermns of the appearance of the labelled grouge in the blood proteinsgenerally, as compared with antibodies produced in response to injected egg albuxin, suggest that the antibedies are not formed asrely by modification of pre-existing plasma globulins, but are synthesised independently. Furthermore, Ae appatee that this ayntheoia begiwe almat ab anes, after injection of the foreign so that. considerable has to a current search of the various tissues te locate the antibody during the early period of apparent latent production, Thare is alec 4 possibility that a “pro-antibody" may thus be demonstrated, arene in Tswoes. (UNCLASSIFIED) At the Sloanbeing de ments of tissue. Two of the general types af method involved are: a) Histeradlography - soft mmnochromatic x-ray beams are passed through a thin section of tisque, and the transmitted radiation is recorded photogrephically. The pattern of the enount of absorption, as related to wave-length, identifies partictlar minerals in the various locations pictured; b) Fivorescense analysis - elements within very emall bite af tissue, exposed to x-rays, absorb the raye and in turn exit lower-energy rays. the wavelengths of these secondary rays serve to identify the elanemts r With improved instrumentation and technical procedures, it is Likely US DOE ARCHIVES 326 U.S. ATOMIC ENERGY COMMISSION RG _20f Avan TORIAN Collection Box Folder harele that one or more of these techniques may greatly facilitate research on the Biological role of important trace minerals. (ORM) _//32 3363 23 | DO ARCHIVES