Empirical study of cubic and quartic vibrational force constants for diatomic molecules shows them to be approximately exponential functions of internuclear distance. A family of curves is obtained, determined by the location of the bonded atoms in rows of the periodic table. Displacements between successive curves correspond closely to those in Badger's rule for quadratic force constants (for which the parameters are redetermined to accord with all data now available). Constants for excited electronic and ionic states appear on practically the same curves as those for the ground states. Predictions based on the diatomic correlations agree with the available cubic constants for bond stretching in polyatomic molecules, regardless of the type of bonding involved. Implications of these regularities are discussed. (auth)

The feasibility of processing enriched irradiated zirconium--uranium alloy fuel by the fused salt-fluoride volatility procedure has been demonstrated in laboratory tests with fuel having a burnup of over 10%. Uranium recoveries were greater than 99% and decontamination factors for radioactive fission products were 10/sup 6/ to 10/sup 6/. The UF/sub 6/ product contained significant quantities of nonradioactive impurities; additional work in this area is needed. (auth)

A method for extracorporeal irradiation of the circulating blood is described. Extracorporeal irradiation of the blood will produce a lymphopenia promptly which persists for weeks. Heparin in high doses in the calf produces a lymphocytosis and neutrophilic leukocytosis. (auth) Red cell sensitization by either agglutinating or incomplete antibodies was detected with an I/sup 131/ labeled rabbit antihuman globulin serum (RAG). Non-specific absorption of RAG by red cells was reduced to a minimum by the addition of 6% bovine albumin. The reactions between RAG and the sensitized erythrocytes were typical of antigen- antibody reactions and the sensitivity of the test was found to be greater than the standard Coombs test. Quantitative studies of the degree of erythrocyte sensitization by isoimmune or autoimmune antibodies were possible with this technic. (auth)

A modification of the pyroelectric sodium fluoride carrier distillation method for analysis of impurities in plutonium metal is described. The metal is dissolved. Plutonium is precipitated and treated with nitric acid. The slurry obtained is dried and ignited. The resultant low density oxide is mixed with sodium fluoride and pressed into a pellet for arcing. Cobalt is used as the internal standard for densitometric using visual comparisons against prepared standards. The procedural modifications improve reproducibility and sensitivity of most of the elements involved. (auth)

In the bombardment of Al foils with 28-Bev protons the following cross sections (in mb) for production of the indicated nuclides were obtained: Be/sup 7/ , 7.9 plus or minus 0.5; F/sup 18/, 6.0 plus or minus 0.3; C/sup 11/, 4.7 plus or minus 0.2; Na/sup 22/, 9.8 plus or minus 0.6. N/sup 13/, 1.18 plus or minus 0.07; Na/su p 24/, 8.3 plus or minus 0.5; O/sup 15/, 3.6 plus or minus 1.0, Mg/sup 27/, 0.067 plus or minus 0.006. An upper limit for the Ne/ sup 24/ eross section of 0.6 mb was obtained. The Mg/sup 27/ cross section has been corrected for secondary reactions and represents only production by primary protons, presumably by the (p,p pi /sup +/) reaction. The measurements were made relative to the production of C/sup 11/ activity in polyethylene and polystyrene foils. The production of Be/sup 7/ in the plastic foils was also observed and corresponds to a cross section of 7.7 plus or minus 0.4 mb per carbon nucleus. By comparison of these cross sections with those at lower bombarding energies, no significant trend of the excitation functions is observable. (auth)

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Studies were made on the reactions of C/sup 11/ in methane containing oxygen. The nuclear reactions C/sup 12/(n,2n) and C/sup 12/(p,pn) were used to produce C/sup 11/. Concomitant radiolysis of the methane during C/sup 11/ production clearly affected product distribution. C/sup 11/-labeled ethane and propane decreased while methane, ethylene, and acetylene decreased. It was assumed that reduction by hydrogen atoms was probably occurring in the unscavenged system. The effects of oxygen and of phase are discussed. In all cases, in duplicate systems, the product distributions resulting from inducing the C/sup 12/(p,pn) reaction were the same within experimental error as those resulting from the C/sup 12/(n,2n) reaction. (P.C.H.)

It is found, on the basis of calculations extended from the bulk- superconductor case, that for thin-film superconductors: the superconducting- normal phase transition induced by a magnetic field is second-order at all temperatures; a simple scaling rule exists concerning the field and temperature dependence of the energy gap; and the critical field depends on the thickness and temperature according to a certain formula for thicknesses above about 0.5 x 10/ sup -6/ cm. (T.F.H.)

An analysis is made of the energetic, molecular, macromolecular and organizational steps which appear to be essential for the development of a living cell from a nonliving origin. Accepting the current view of the primitive atmosphere of the earth, experimental demonstration for the formation of the fundamental molecules of living organisms (amino acids, fatty acids, purines and pyrimidines) under the influence of available energy sources (ultraviolet light, ionizing radiation and electric discharge) is presented.

Dye-macromolecule complexes provide good models for the study of the effects of coupling between chromophores. In addition to modifications of the visible and UV absorption spectra of the dyes at small interchromophore distances, very efficient energy transfer has been demonstrated at longer distances. The probability of nonradiative transition increases with the number of excitation transfers so that an array of oscillators close to one another becomes nonfluorescent. The insertion of a dye molecule, acting as a trap for the excitation energy, in the highly ordered system of chromophores constituted by the purine and pyrimidine bases of native DNA has given results supporting the intercalation model of Lerman and providing an experimental approach to the problem of the path length of energy migration in the DNA molecule. The average excitation path length seems to be of the order of only ten base pairs, a result which can explain the lack of fluorescence of the DNA.

Proton-proton interactions with four or more charged particles in the final state are studied over a range of incident momenta between 13 and 28.5 GeV/c. Topology cross sections are presented. The center-of-mass momentum distributions of {pi}{sup +} and {pi}{sup -} are determined and are successfully parameterized. The {pi}{sup +} and {pi}{sup -} momentum spectra are found to have approximately the same shape. Multiple fireball production is not required by our data.

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An isochronal differential-type microcalorimeter has been designed and constructed. As a result of its simple design it is very easy to handle the samples and assemble the calorimeter. Important to the operation of the calorimeter is a program, also working on the differential principle, that provides linear temperature rise of the samples. The calorimeter is used to measure very small energy releases such as those found in precipithtion, stored energy, etc. It is demonstrated that the calorimeter is easily capable of measuring 0.005 cal with a probable error of the order of 1 to 2%. (auth)

No Abstract. There is a duplicate copy.

Article discussing averaged electroencephalic responses to sound obtained by direct method recording and radio telemetry.