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Using the activitation method ( n,2 n) excitation-functions were measured forFe,Ge,Se,Rb,Sr,Y,Mo, andHg in the neutron-energy region 13-18 MeV. The results are checked for consistency by means of a systematic of ( n, 2 n) cross-sections as a function of the nuclear neutron excess ( N-Z)/A. Furthermore the data are compared with results from the statistical nuclear reactions theory which were calculated using optical model absorption cross-sections and the Fermi-gas-model formula for the nuclear level density. In the case ofHg the influence of preequilibrium nucleon emission was taken into account. [ABSTRACT FROM AUTHOR]

The action of antibodies and of the haemolytic complement system does not induce immune immobilization of Treponema pallidum, but only destroys superficial wall structures of these Gram-negative organisms. In sensitized and complement coated treponemes the immobilization is a result of the lysozyme interaction with the mucopeptide layer of the cell wall. In a lysozyme-free medium, immunologically damaged treponemes are able to repair the defects in the outer layers of their cell wall structures. Furthermore, it is shown that the long lag period in immune immobilization of T. pallidum can only partly be explained by the interaction of lysozyme with the treponemes. [ABSTRACT FROM AUTHOR]

Comments on an article on the theory of the Liapunov exponents of Hamiltonian systems and the transition from regular to irregular classic motion. Method for calculating the fraction of the phase space; Significance of choosing the correct Poincaré section.