In recent years German physicists have been making increasing use of both mass spectrographs in the stricter sense and mass spectrometers which can only measure elative isotopic abundances and use electrical methods of measurement.

Using classical concepts, the author establishes a model of a luminescence atom or molecule.

On 14 November 1949, The General Assembly of the Academy of Sciences USSR met in the academy's Conference Hall to discuss the 1950 plans of the Academy

One of the problems in the spectrographic investigation of the atomic nucleus is to increase the efficiency of the source of light used for the investigation. Using new procedures outlined in the article new elements may be detected through nuclear change.

The authors describe Praseodymium which is a rare earths metal that forms several oxides.

The information about electrolytic representation of dichloroethylene is presented in this study.

A. N. Back expressed a hypothesis about the participation of organic peroxide in the process of photosynthesis. Experimental data on this question were very few. This article provides a method of investigation to support the hypothesis.

At the base of photosynthesis of green sulfur bacteria lies an oxidation-reduction reaction of transferring hydrogen from hydrogen sulfide to carbon dioxide, accomplished with the participation of light energy. Based on experiments the author concludes that chlorophyll in the process of photosynthesis plays the role of optical sensitizer.

The discussion of the preparation and properties of thorium by Werner von Bolton have led the author to make comments regarding its preparation.

Dr. H. Karsten responds to a critical review of an earlier article on Thorium originally written by Dr. von Bolton and reviewed by Mr. R. J. Meyer.

The paper represents an effort to make a quantitative determination of actinium by the emanation method in a continuous current of air.

Adsorption passivation of metals is discussed in this paper.

This study has shown the possibility of applying the adsorption method to the separation of krypton and xenon from a concentrate

The theory of metallic diffusion should be facilitated if the regularity of the lattice is disturbed mechanically, or by means of an alletropic transformation.

Various Acids are mixed with Oximes to obtain e-Keta Acids and e-Amine Acids.

Corresponding investigations were carried out for rare earths. Fractional estimates of intensities and rough values of the activation cross sections with thermal neutrons for all earther are listed.

The present knowledge of artificial radio-activity is more spotty for the rare earths than for any other region of the periodic table. The chief reason for this is the difficulty of obtaining sufficiently pure samples or at any rate such of well-known composition. Rare earthers were investigated through the activation by thermal neutrons.

The dependence of the ion output on several variables was studied thoroughly and the point of optimum operatio was determined. Mercury ions were used and certain observed effects were ascribed to the presence of heavier ions.

The auth measured the critical cathode potentials, often called the decomposition potentials of the second type, of vary dilute solutions of bismuth nitrate using isotopes of RaE and ThC as radioactive indicators.

The following document is a collection of investigative reports on the victims of the atomic bomb in Japan. Information covers injuries, how the victim was found, if they were protected, where they were when the bomb went off, radiation effects, and more.

Two chapters taken from the author's book on Atomic Energy which assists the general reader in understanding the many questions around its development.

The physics of rays offered new ways of therapy by high-frequency and ultra-frequent currents. With the discovery of the spontaneous slow radioactive decay of certain elements, a new start was given for the study and the treatment of cancer and other diseases.

Experiments on the electrolysis of Po from a NaOH solution reveal a method for determining the sign of the charge on Po ions in this medium.

A given calculation of the lowest energy states of the naphthalene molecule by the method of molecular orbitals with consideration of the non-orthogonality of the wave functions of neighboring atoms.