‘levels. of. activity. that Little rédiation. herni is “possible. fai -short- term|Jpumanexperiments.,can:beyperformedwith.BS,little vr:anetance;, * -gne.micro- ; eral, oseureof:‘from: 100 ‘microcuries’“ofCc‘awteberealycine‘fed to be followed for 9 months.” eet er WAS » 4 vt ' Brookhaven conference on the chemistry and. physiology nucleus. A conference was held at the Brookhaven National L@boratory on the chemistry and physiology of the nucieus. This was a we -planned conference divided into six sections covering 3 days, and w attended by more than 250 visiting scientists in addition to the staff o the Biology Department. Dr. Felix Haurowitz (Indiana) gave evidence that the erum globulius _has two sorts of specificity. The first is due to the numbe and sequence of amino acids in the peptide chain and is unchangeable and s gene determined in each animal species. The second is the changeable tibody function and is due to the surface configuration of the mol ules. The latter appears to be determined by the injected antigens an not by genes. A report was given by Dr. 0. F. Binkley (Utah) on nu ‘which may themselves act as enzymes. Dr. Joseph Weiss (Dur eic acids ; England) gave an account of the effects of radiation on inorganic and organic chemical compounds. The effects of 10° roentgens on nucleidg acids resulted in fragmentations of the nucleotides with liberationfof free purines and inorganic phosphate. These results may be signifidant in visualizing the changes produced by radiation on living cel]Js and nuclei. Dr. Arnold H. Sparrow (Brookhaven National Laborator: r) reviewed the sensitivity of the different stages in nuclear division in blant cells to radiation. Breakage and mutations occur more frequently at metaphase, and appear to be unrelated to the relative amounts of desox rribose nucleic acid. Dr. E. D. Delamater and Dr. Stuart Mudd (Pennsylvanif) found by using both light microscope and electron microscope that bakteria possess nuclei, mitotic spindles, and chromosomés, like other cell Cataracts. All mice exposed even to the lowest neu Operation GREENHOUSE developed eye cataracts within 8 week eit Pe oe Pe operation. There is no certainty that these cataracts wil on flux at after the be permanent. pa Pr iey aa Medicine Branch ae) z an cote Oe . i vy ‘ Te in: Sabot bn fy ; ¥ er,=| Construction on the Arzo e Cancer ly and complefor research ed and will dies on indithe protective e body ws Poeste oes Seen 45 rey Argonne Cancer Hospitai. Hospital after some delays last spring is progressing rapi tion is anticipated for approximately April 1, 1952. Plan progrems to be carried out in this hospital are Well advan include among items of major interest to the Commission st viduals who received radium therapeutically and studies on effects of shielding various organs during exposure to who - 14 - CHIVES <