All these assays have to deal with the low number of CEC in peripheral blood, (typically 0 20 CEC per ml in healthy donors) rendering such assays highly susceptible to errors in sampling, preparation, and analysis.
Further analysis of CEC numbers in cancer patients, demonstrated significantly higher CEC in patients with progressive disease vs those with stable disease (95 patients, 438±65 CEC per ml and 17 patients, 179±61 CEC per ml, respectively), whereas no difference was seen between patients with stable disease and healthy donors (Beerepoot et al, 2004).
The flow cytometric quantification of mature CEC showed significantly (P<0.01) elevated amounts of CEC in the patient samples (median: 5.7 CEC μl−1 blood) at the time of diagnosis compared to the matched controls (median: 1.3 CEC μl−1 blood).
Therefore, assays that allow the discrimination between these two putative types of CEC are thought to improve the specificity of the enumeration of CEC in cancer.
Although consensus on the phenotypic definition of CEC as well as on the optimal enumeration technique is still lacking, the number of clinical studies assessing CEC in cancer patients is rapidly expanding.
The natural mineral lattice is almost neutral, having a cation-exchange capacity (CEC) in the order of 0.07 meq.g−1.
Large amplitudes of interannual variability in surface aerosol concentrations reaching 20 30% relative to the 10-year averages were found over southern CEC in summer and over northern CEC in winter.
The gliricidia intercrop maintained CEC in coarse-textured soils over a 14-year time span, indicating a role for legume trees in intensified cropping of coarse-textured soils.
The objectives of this study were to apply a k-NN approach to predict CEC in Iranian soils and compare this approach with the popular artificial neural network model (ANN).
This study provides key empirical evidence of adverse impacts of CEC in communities on an important chronic disease, illustrating the contextual effects of living in long-term degraded landscapes and communities.
A fluorescence-based enzyme assay was performed by co-incubating human cDNA-expressed CYP1A2 with its selective probe substrate, 3-cyano-7-ethoxycoumarin (CEC), in the absence or presence of various concentrations of herbal active constituents.
