2)GrtolopicStudyEffectRadiationBroad Bean Mitosis, (D, Hale, C, Lushbaugh): | Following the completion of the effect of 540 r on the mitosis of the bean root tip this experiment was repeated on 400 r but is still incomplete. 3) Luminescent Bacteria, (L, Hughes, C, Lushbaugh): Attempts to enumerate the number of bacteria producing light in a given situation by use of the densitometer showed that very few bacteria were required for our electronic system to count. Preliminary experiments were done in order to see whether or not the growth of this bacteria could be limited quantitatively by limiting the carbon or nitrogen in the media. Additional observations were made upon the effect of a fixed dose of 10,000 r on subsequent generations of bacteria, The effect has proven to be quite variable but to become decreasingly effective. 5, Organic ChemistrySection, a, (W, H. Langham) Synthesis of Organic Scintillat Ott, V, Ke The following compounds were prepared for testing as liquid solution scintillators: 2,5-diphenylthiophene, 2,2'-(5-phenylbioxazolyl), 2-(4~tolyl)-5-phenyloxazole, and 2-(4-biphenylyl)indole. The syntheses of intermediates in the preparation of p-terphenylindole and 4,43 lassification changed to biphenyly4 are in progress. - b, fa odis(2zindolyl) byme U.S. E-RBe Ay Licuid Scintillation Qu Lae : Consecutive coun®¥n 3 Bo vine AT . Canaloa ss sapos sree AY OS AE Oa (Signatare of person making the change, and date) and Na? has been successfully carried out with the room-temperature version of the Model 530 Coincidence System. and from plasma. Samples have been derived from whole blood One milliliter aliquots treated with alcohol to precipitate proteins have had the resulting dilute alcohol solutions combined with alcoholsaline protein washes to make up a final solvent composition of 1.5 ml water, 4 ogo 20K , ee 7 i ; = > Z