Loss of intracellular compartmentalization of potassium is a biochemical feature of Alzheimer's disease indicating a loss of membrane integrity and mitochondrial dysfunction. We examined potassium and rubidium (a biological proxy for potassium) in brain tissue, blood fractions and cerebrospinal fluid from Alzheimer's disease and healthy control subjects to investigate the diagnostic potential o...

Previous studies have shown that administration of rubidium to normal or potassium-depleted rats results in a) metabolic acidosis (1), and b) accumulation of rubidium in muscle tissue where it attains final concentrations considerably higher than that of potassium (2). Since it was found that rubidium was at least as effective as potassium in lowering the plasma CO2 content of potassium-deficie...

Catecholamines induce net salt and water movements in duck red cells incubated in isotonic solutions. The rate of this response is approximately three times greater than a comparable effect observed in 400 mosmol hypertonic solutions in the absence of hormone (W.F. Schmidt and T. J. McManus. 1977 a.J. Gen. Physiol. 70:59-79. Otherwise, these two systems share a great many similarities. In both ...

The push for a semiconductor-based quantum information technology has renewed interest in the spin states and optical transitions of shallow donors in silicon, including the donor bound exciton transitions in the near-infrared and the Rydberg, or hydrogenic, transitions in the mid-infrared. The deepest group V donor in silicon, bismuth, has a large zero-field ground state hyperfine splitting, c...

The double-bulb rubidium maser (DBRM) relies on a vacuum cell for its operation. This differs from the spin-exchange noble gas cells which contain Xe, He and N2 as well as rubidium. These gases (in addition to playing active roles in the noble gas experiments) act as a buffer, keeping the Rb away from the walls of the cell. In the DBRM the lack of buffer gases allows rubidium atoms to effuse be...

Alkali vapours, such as rubidium, are being used extensively in several important fields of research such as slow and stored light nonlinear optics quantum computation, atomic clocks and magnetometers. Recently, there is a growing effort towards miniaturizing traditional centimetre-size vapour cells. Owing to the significant reduction in device dimensions, light-matter interactions are greatly ...

The structural unit of the title compound, [Rb(C(6)H(3)N(2)O(4))(C(6)H(4)N(2)O(4))(H(2)O)(2)](n), consists of one rubidium cation, one hydrogen pyrazine-2,3-dicarboxyl-ate anion, one pyrazine-2,3-dicarboxylic acid mol-ecule and two water mol-ecules. This formulation is repeated twice in the asymmetric unit as the rubidium cation lies on an inversion centre. Each anion or acid mol-ecule is linke...

To understand the optical properties of atoms in solid state matrices, the absorption, excitation, and emission spectra of rubidium doped thin-films of argon, krypton, and xenon were investigated in detail. A two-dimensional spectral analysis extends earlier reports on the excitation and emission properties of rubidium in rare-gas hosts. We found that the doped crystals of krypton and xenon exh...

Interest in the biological properties of rubidium and cesium stems from their close physicochemical relationship to potassium. Reference to the Periodic Table shows these elements to be adjacent members of the Group I alkali metal series, which has the order: lithium, sodium, potassium, rubidium, cesium. In terms of their chemical behavior the elements of this series may be separated into two g...