Measuring brain receptors and neurochemistry5

Many neurochemical hypotheses, generated by post-mortem and animal data, can be rigorously tested with PET and SPET in the living brain whilst avoiding many of the confounding variables inherent in other techniques. Many receptor systems can be studied ( T§b.!e..1). However, the rate of discovery of new radiotracers, suitable for use in humans, is relatively slow. Many conditions have to be satisfied to produce a suitable radiotracer for human use including blood-brain barrier permeability, high specific binding, receptor selectivity, absence of radioactive metabolites, and adequate modelling of tracer kinetics ( Plate.6).

5 Secrets to Lasting Longer In The Bedroom

5 Secrets to Lasting Longer In The Bedroom

How to increase your staying power to extend your pleasure-and hers. There are many techniques, exercises and even devices, aids, and drugs to help you last longer in the bedroom. However, in most cases, the main reason most guys don't last long is due to what's going on in their minds, not their bodies.

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