10 research outputs found
Real clocks and the Zeno effect
Real clocks are not perfect. This must have an effect in our predictions for
the behaviour of a quantum system, an effect for which we present a unified
description encompassing several previous proposals. We study the relevance of
clock errors in the Zeno effect, and find that generically no Zeno effect can
be present (in such a way that there is no contradiction with currently
available experimental data). We further observe that, within the class of
stochasticities in time addressed here, there is no modification in emission
lineshapes.Comment: 12 a4 pages, no figure
Quantum Anti-Zeno Effect
We demonstrate that near threshold decay processes may be accelerated by
repeated measurements. Examples include near threshold photodetachment of an
electron from a negative ion, and spontaneous emission in a cavity close to the
cutoff frequency, or in a photon band gap material.Comment: 4 pages, 3 figure
Pharmacokinetics of imidocarb in normal dogs and goats
The pharmacokinetics of imidocarb was studied in seven mongrel dogs and eight crossbred goats. An intravenous bolus dose (4 mg/kg) of 12% imidocarb dipropionate solution was injected into the cephalic vein in dogs and the jugular vein in goats. The plasma concentration of imidocarb was measured by spectrophotometry. The experimental data were analysed using a two-compartment open model. The apparent volume of the central compartment was significantly higher (P<O.O 1) in dogs than in goats. The significantly larger (P<0.05) apparent specific volume of distribution in goats than in dogs may be attributed to passive diffusion followed by ion trapping of the drug in rumen fluid. Neither the half-life nor body clearance differed significantly between dogs (tl/2' 207 ± 45 min; CIB, l.47 ± 0.38 ml/min kg) and goats (tY2' 251 ± 94 min; CtB, 1.62 ± 0.50 ml/min kg). While almost 80% of the dose had been eliminated at 8 h in both species, the high ratio of the imidocarb level in the peripheral-to-central compartment in goats suggests that a prolonged period may be required for complete elimination of the drug