An assay for the determination of protein in an aqueous test fluid which combines the test fluid with a buffer and a dye. The liquid-bearing tube has a flat area on which a thermostat is mounted. The vortex pulverizes diesel fuel and optimally mixes the diesel fuel with an oxidant prior to introduction into a combustion chamber. Similarly, the second rectangular fin structure also has a bottom contacting the substrate, a top opposite the bottom, and sides between the top and the bottom. Compounds of the invention are high potential NK-3 receptor antagonists for the treatment of depression, pain, psychosis, Parkinson’s disease, schizophrenia, anxiety and attention deficit hyperactivity disorder. The drill guide is configured to bore a pocket hole and a pilot hole into the first mitered molding, the pocket and pilot holes receiving a fastener to draw and secure the second mitered molding to the first mitered molding.