The latest volume in this valuable series includes the following chapters: (1) The Determination of Amino Acids by High-Voltage Paper Electrophoresis, by S. Blackburn, who gives useful details for the rapid separation and analysis of amino acid mixtures; this reviewer was not convinced, however, that present-day electrophoretic methods can match ion-exchange chromatography in precision. (2) Mob...

Currently, thirty-four samarium, thirty-four europium, thirty-one gadolinium, and thirty-one terbium isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented. ∗Corresponding author. Email address: [email protected] (M. Thoennessen...

Phylogeny based on ribosomal RNA sequences alone is rarely a reliable indicator of microbial function. To circumvent this problem, nucleic acid based techniques have been developed that exploit the physical properties of stable isotopes to study microbially mediated processes within complex environmental samples. Investigations using labelled substrates, or which detect variations in the natura...

A new type of cell for countercurrent electromigration of molten nitrates is proposed, in which molten NH4NO3 is employed just above its melting point in a large cathode compartment. This cell can be used effectively without trouble of corrosion for the purpose of (1) enrichment of 6Li, (2) enrichment of heavier isotopes such as 7Li, and (3) measurements of relative internal mobility difference...

In nature most elements are mixtures of isotopes: they are made up of at­ oms that all have the same number of protons and electrons but that differ in number of neutrons. Ordinarily the fact that an element is a mixture of sev­ eral ·kinds of atoms matters little be­ cause the various isotopes are all but indistinguishable in most of their prop­ erties. For that very reason. however. when we d...

The recent discovery of isotopes with Z=110–111 suggests evidence for (1) a monopole–monopole interaction that does not appear explicitly in Nilsson– Strutinsky mass systematics, and (2) a competition between SU(2) and SU(3) dynamical symmetries that has been predicted for this region. Our calculations suggest that these new isotopes are near spherical, and may represent a true island of superh...

Isotope shifts, spins, hyperfine structures and masses have been measured for the series of the alkali isotopes including the nuclei far from stability. The method of laser spectroscopy and its combinations with rf excitation are described. Some results are discussed, namely the first observation of the red doublet D~-D2 of francium, and the study of shell effects and changes of shape with mass...

X rays from the cascade of antiprotonic atoms have been studied by the PS209 Collaboration at LEAR of CERN. In this publication the strong interaction widths and shifts for calcium isotopes are presented. The isotopes Ca,Ca,Ca,Ca, and Ca have been investigated. The measured widths are compared with results from Hartree-Fock-Bogoliubov calculations. As a CaCO3 target had been used for the measur...

With the advent of high-energy collimators and dual-head coincidence cameras, standard nuclear medicine facilities will soon begin imaging with PET isotopes. The use of 511keV emitters raises new radiation safety concerns for technologists traditionally limited to handling mTc and other low-energy isotopes. This article is a basic review of positron emitters, measurement concerns, exposure rate...