The methodology was tested in three brains analysing the contribution of the multi-step sampling procedure to the precision on the estimated total numbers of immunohistochemically defined NeuN expressing (NeuN+) neurons and CD45+ microglia.
This multi-step sampling scheme enriched the population for genetically predisposed individuals, which was an objective of the Ontario Familial Breast Cancer Registry [ 11].
This epidemiological study aimed to assess fibromyalgia (FM) prevalence in the French metropolitan population, based on a multi-step sampling analysis, combining national screening and clinical confirmation by trained specialists.
However, the automation of multi-step sample processing, reaction and detection remains a great challenge.
These methods are quite accurate, but they are dependent on multi-step sample clean-up procedures and are therefore relatively expensive and time consuming.
As expected, the polyribosome data sets showed higher variance (presumably due to the multi-step sample preparation) and also more genes with extreme fold-changes.
Other investigators achieved lower detection limits for real-time PCR assays with simulated human respiratory specimens, but only after multi-step sample treatment [19], [22].
Proteomic methods are largely based on the use of mass spectrometry (MS), a highly specific, effective, and universal technique that does not require complicated multi-step sample preparation.
The procedure is based on a sample multi step chemical pre-treatment (solvent extractions and microwave-assisted chemolysis) that is able to separate the various organic components into three different fractions: amino acid, acidic and neutral fractions.
A multi-step random sampling method was adopted to draw a large representative sample from the Italian population.
This was previously a multi step process.
