LXIII. A new photometer

Lxiii. Studies on the Permeability

IN earlier papers of this series [Davson, 1934; Davson and Danielli, 1936] attention has been drawn to the work of Ponder and Saslow [1930; 1931] on the volumes of rabbit's erythrocytes. These authors observed that in hypotonic solutions the erythrocytes gained much less water than was expected and in hypertonic solutions lost far less; in fact an increase in volume ofthe erythrocytes was gener...

A lithium internal-standard flame photometer.

Performance characteristics of a new photometer with a moving filter tape for luminescence assay.

The performance characteristics of a new photometer that incorporated a reaction system consisting of a movable filtration tape have been studied for use with the firefly luciferase assay for adenosine 5'-triphosphate. Precision, linearity, and sensitivity are given for measuring a graded series of constant-light emitters, concentrations of adenosine 5'-triphosphate, and washed bacterial cells....

OPTIMA: A Photon Counting High-Speed Photometer

OPTIMA is a small, versatile high-speed photometer which is primarily intended for time resolved observations of young high energy pulsars at optical wavelengths. The detector system consists of eight fiber fed photon counters based on avalanche photodiodes, a GPS timing receiver, an integrating CCD camera to ensure the correct pointing of the telescope and a computerized control unit. Since Ja...

International Union of Pharmacology. LXIII. Retinoid X receptors.

The physiological effects of retinoic acids (RAs) are mediated by members of two families of nuclear receptors, the retinoic acid receptors (RARs) and the retinoid X receptors (RXRs), which are encoded by three distinct human genes, RXRalpha, RXRbeta, and RXRgamma. RARs bind both all-trans- and 9-cis-RA, whereas only the 9-cis-RA stereoisomer binds to RXRs. As RXR/RAR heterodimers, these recept...