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SummaryPulse-radiolysis studies of aqueous papain solutions have been made over the 50 µs to 0·40 s time-scale and the 300 to 500 nm wave-length range. For the intermediates formed from both e−aq and OH, the observed changes in optical density over the above time-scale are independent of papain concentration and dose per pulse. They are attributed to sequences of reactions within the same papain molecule. The overall conclusions are similar to those reported previously for the decay of ribonuclease intermediates (Lichtin, Ogdan and Stein 1972) and their implications for the interpretation of the mechanism of 60Co inactivation of papain are pointed out.

The upper limit of platelike growth of polyethylene from a 0.1% solution by weight in o-xylene can be represented by the equation T′ = M × 103/(2.747M + 170.6). This equation was derived on kinetic and thermodynamic arguments. Dendritic growth occurs 8–10°C. below T′. Higher molecular weights give more irregular and more branched dendrites. The ratio of heterogeneously nucleated hedgehog dendrites is constant for any one preparation crystallized at different temperature. Polymethylene can crystallize in a different morphology above T′. Interference microscopy was used as a main tool in this research.

In this paper, we have given a method for calculating non-axial rotational wave functions and energy levels of odd-A nuclei by means of that of even-even nuclei.

A two-meter normal incidence vacuum ultra-violet spectrograph has been built and in operation for some time. The spectrograph has an angle of incidence 7.5° and covers the spectral range 2100 A-200 A, with an average dispersion 8.7 A/mm. A low pressure condensed spark discharge tube is used as the source, giving intense sharp spectral lines of various degree of ionization. Majority (554 in number) of the emission lines has been identified.