ered negative with a possible error of 57;. and that a titre alxm 146% for the d o t formation method and above 130% for the spectrophotmetric method could be considered as indicative of malignanst neoplasia with a possible error of 5%. With the clot formation method, titres between 112.5v and 146% and with the spectrophotometric method titres between 103% and 13076 must be considered of doubtful significance.These results indicate that this spectrophotometric method may be as satisfactory for the detection of patients with malignant neoplasia as the previously reported method.False positive results with the spectro-photometric method fall in the same groups as with the clot formation method, i.e. those patients with acute infectious diseases, especially streptococcal infections, those with advanced tuberculosis of the lungs and those recently subjected to major operations. Summary. A spectrophotometric method of assay of antiproteolytic material in the .serum, using inhibition of trypsin digestion d fibrinogen, has been described. Results obtained in 250 sera by this method have been analyzed statistically and have been found to .;how a close correlation with the clot formation method.
From the polarization properties of the fluorescence spectrum of single crystals of europic ethylsulfate nonahydrate it was possible to determine the multipole character of transitions, the energies and quantum nature of the seven levels of the ground state multiplet of the europic ion, and the group character of the sublevels into which these states are split by the crystal field. Such an analysis was made of all pure, uncoupled electronic transitions in the fluorescence spectrum. The analysis revealed that the rare earth ion is predominantly perturbed by a field of D3h symmetry, arising from the water molecules of hydration immediately surrounding it. Upon this field is superimposed a weaker one of lower symmetry, C3h, arising from the lattice as a whole. All transitions involving a change of J of one appeared as magnetic dipole radiation. All others appeared as forced electric dipole transitions, including one which would have been fully allowed as a magnetic dipole transition.
A similar analysis of the absorption spectrum in the near ultraviolet was only partially successful because of the superposition of the split levels of some of the upper states. It was in accord with the analysis of the fluorescence spectrum and from it was determined the multipole nature of the transitions and the quantum nature of some of the more isolated upper states.
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