The DNA polymerase activity in preparations of A particles from mouse myeloma has been further character ized. Most of the radioactive product from reactions containing poly(rA)-(dT)12 18and dTTP-3H was composed of dTMP-3H in the form of nuclease-sensitive macromolecules with an average density of 1.428 g/ml, deter mined in cesium sulfate gradients at neutral pH; the product therefore possessed...

The concentrations of Cs and potassium in the surface layers of arable soils were analyzed in the selected region of Eastern Poland approximately 20 years after the Chernobyl power plant accident. Additionally, the occurrence of the elements in soil in the forms available for plants was determined. In relation to the total concentrations of Cs and K in the soil, cesium is found in larger quanti...

A lthough heart disease is the principal cause of death in many countries and its diagnosis is of major importance, methods for direlct visualization of the myocardium in intact subjects are few. The roentgenogram of the heart shows the myocardium plus other tissues, especially the blood contained in the cardiac cavities, as a single shadow. Various techniques show cavities and vessels rather t...

Cardiac automaticity is partly due to a diastolic sodium current. Possible mediators of this include tetrodotoxin-sensitive "fast" channels, cesium-sensitive time-dependent pacemaker current channels, calcium-gated nonspecific channels, and electrogenic sodium-calcium exchange. We have studied the effects of abrupt sodium removal on membrane current and conductance in voltage-clamped chick embr...

The mechanism by which magnesium therapy suppresses some ventricular tachyarrhythmias characterized by a prolonged QT interval (e.g., torsades de pointes) is unknown. Since early afterdepolarizations have been proposed as a cause of the long QT syndrome and the related ventricular tachyarrhythmias, we hypothesized that magnesium therapy would suppress both the early afterdepolarizations and the...

The facile syntheses of a variety functionalized propiolic acids were achieved by carboxylation of alkynylsilanes with carbon dioxide mediated by cesium fluoride under ambient conditions.