Synthesis of [Ring‐3H] Dopamine and Fluoro Analogues at High Specific Activity

Dopamine and several fluoro analogues were labeled with tritium at high specific activity by a catalytic tritium dehalogenation of polybromo precursors.     

Simple Thermomechanical Materials with Memory

This paper presents a framework for formulating frame-free constitutive laws for simple materials accounting for thermal effects. It is shown how memory can be modeled within this framework and fading memory is given as an example. The restrictions that the second law of thermodynamics on the constitutive laws for materials with fading memory are found using the Coleman?CNoll procedure. It is shown that materials with fading memory, when undergoing a process that is long and slow enough can be approximated in some sense. Finally, equilibrium states are considered and under weak assumptions the familiar relations from thermostatics are obtained.     

High specific activity tritium labelling of some sigma-1 receptor agonists

The high specific activity tritiation of (+)-SKF-10,047 (1) and N,N-dimethyltryptamine (4) is described. [N-allyl-³H] (+)-SKF-10,047 (3) was prepared by Lindlar catalyst tritiation of (+)-N-propargylnormetazocine (2) and [N-methyl-³H] N,N-dimethyltryptamine (6) was synthesized by the alkylation of N-methyltryptamine (5) with [³H] methyl iodide. Both sigma-1 synthetic agonist 3 and endogenous agonist 6 have been useful in studying this receptor.     

Operational characteristics of a MAGPIE coaxial CO2 discharge system

The operational characteristics of a convectively cooled Magnetically stabilized, Photo-initiated, Impulse-enhanced, Electrically-excited (MAGPIE) coaxial discharge system are described. terminal behavior is examined as a function of several parameters, such as gas flow, pulser ionization, and magnetic field strength. In-situ plasma potential measurements are also presented, which indicate that CO₂ attachment effects have considerable influence on the spatial electrical characteristics of the gas discharge.     

Electron density measurements in a gas discharge subjected to a rotating magnetic field

Measurements of the electron density within an axial CO₂ laser discharge subjected to a transverse rotating magnetic field are presented. Experiments were performed with a single Langmuir probe. Electron density is evaluated using Su and lam's thick sheath expression for a stationary plasma. Results are presented for a 2.7 kPa (20 torr) discharge with external pre-ionization and for a 0.7 kPa (5 torr) self-sustained discharge.