1.1 Technique of nigrostriatal FP-CIT SPECT The density of the presynaptic dopamine reuptake transporters (DAT) can be quantified with [123I]FP-CIT SPECT. The tracer Fluorpropyl-Carbomethoxy-Iodophenyl-Tropan (FPCIT), marked by radioactive 123iodine [123I] (therefore the name [123I]FP-CIT), binds reversibly to the DAT on the presynaptic membrane. Before application of FP-CIT, the iodine uptake ...

We study experimentally and theoretically mixing at the external boundary of a submerged turbulent jet. In the experimental study we use particle image velocimetry and an image processing technique based on the analysis of the intensity of the Mie scattering to determine the spatial distribution of tracer particles. An air jet is seeded with the incense smoke particles, which are characterized ...

Turfgrass Research. The lysimeter is 4.0 m deep, 2.5 m in diameter, and contains a homogeneous packing of Vinton fine Experiments were conducted in a well-instrumented weighing lysand (sandy, mixed, thermic Typic Torrifluvents) with a mean simeter (2.5 by 4 m) to evaluate the efficacy of the gas-phase-partibulk density of 1.38 Mg m 3 and porosity of 0.47. Details tioning tracer method for measu...

Hipparcos data provide the first, volume limited and absolute magnitude limited homogeneous tracer of stellar density and velocity distributions in the solar neighbourhood. The density of A-type stars more luminous than M v = 2.5 can be accurately mapped within a sphere of 125 pc radius, while proper motions in galactic latitude provide the vertical velocity distribution near the galactic plane...

In a distribution ray tracer, the crucial part of the direct lighting calculation is the sampling strategy for shadow ray testing. Monte Carlo integration with importance sampling is used to carry out this calculation. Importance sampling involves the design of integrand-specic probability density functions which are used to generate sample points for the numerical quadrature. Probability densi...

OBJECTIVE This study aimed to investigate whether cholesteryl ester transfer protein inhibition promotes in vivo reverse cholesterol transport in dyslipidemic hamsters. METHODS AND RESULTS In vivo reverse cholesterol transport was measured after an intravenous injection of (3)H-cholesteryl-oleate-labeled/oxidized low density lipoprotein particles ((3)H-oxLDL), which are rapidly cleared from p...

We update the method of the Holmberg & Flynn (2000) study, including an updated model of the Milky Way’s interstellar gas, radial velocities, an updated reddening map, and a careful statistical analysis, to bound the allowed surface density and scale height of a dark disk. We pay careful attention to the self-consistency of the model, including the gravitational influence of the dark disk on ot...

A quadrature expression is derived for the probability density function of passive tracers advected from a point by a one-dimensional, single-scale, Gaussian velocity field. The effect of trapping on the tracer moments and the Lagrangian velocity variance is explicitly demonstrated.

We show that, even in the most favorable case, the motion of a small spherical tracer suspended in a fluid of the same density may differ from the corresponding motion of an ideal passive particle. We demonstrate furthermore how its dynamics may be applied to target trajectories in Hamiltonian systems.

ABSTRACT HCN $J = 1\,\!-\!0$ emission is commonly used as a dense gas tracer, thought to mainly arise from with densities ∼104–105 cm−3. This has made it popular tracer in star formation studies. However, there increasing evidence observational surveys of ‘resolved’ molecular clouds that can trace more diffuse gas. We investigate the relationship between density and through post-processing high...