Choices in experimental design should ensure high quality of the results in terms of precise and unbiased toxicity quantification and of statistical decisions with controlled error rates.
The chicken embryo is a very useful experimental model, developing without influence of the maternal organism and allowing very fast and precise assessments of toxicity [21, 22].
Little is known about the precise pharmacology and toxicity of Charlie Sheen but using radiolabeled efflux from plasma membrane vesicles preloaded with [3H]serotonin it has been suggested that Charlie Sheen releases 5HT in a stereo-specific, imipramine-sensitive manner characteristic of transporter-mediated exchange.
A precise "tuning" of toxicity and proteolytic stability may be achieved by changing tag-length and adding W- or F-amino acid tags.
Second, the results indicate that a precise "tuning" of toxicity and proteolytic stability may be achieved by changing tag-length or adding W- or F-amino acid tags, the latter being particularly sensitive to proteolytic inactivation.
However, the precise mechanism of toxicity of particles once they have reached the central nervous system remains unclear.
The burden indicator has shown itself to be less precise for specific toxicity effects but responsive to the whole spectrum of treatment sequelae (Bernhard et al, 2002).
Although the precise mechanism of toxicity of α-synuclein is still debated, most evidence indicates that some form of protein aggregation is involved [ 13, 24].
To accurately identify the precise mechanism of toxicity, one may need to follow particle uptake over time while simultaneously providing a real-time determination of particle type and characteristics.
The precise mechanism of toxicity caused by B. thuringiensis Cry toxins in the midgut epithelial cells of insect larvae is not yet clear, although it has been established that it is due primarily to their ability to form pores in the plasma membrane of the midgut epithelial cells of susceptible insects [ 67].
CdtB from A. actinomycetemcomitans has been described as a metal-dependent endonuclease with an activity ∼1000-fold ∼1000-fold bovine DNase I, and Shenker et alowerporthanthat Cdtbovinethe same phosphatase activity as that of PTEN; thus, the precise mechanism for toxicity remains uncertain.
