PubMed · 3046433
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
J G Stevens, L H Bowen, K M Whatley. 1988-06-15. Mössbauer spectroscopy.. https://doi.org/10.1021/ac00163a007
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
The EVA descriptor is derived from fundamental IR and Raman range molecular vibrational frequencies. EVA is sensitive to 3-D structure, but has an advantage over field-based 3-D QSAR methods inasmuch as it is invariant to both translation and rotation of the structures concerned and thus structural superposition is not required. The latter property and the demonstration of the effectiveness of the descriptor for QSAR means that EVA has been the subject of a great deal of interest from the modelling community. This review describes the derivation of the descriptor, details its main parameters and how to apply them, and provides an overview of the validation that has been done with the descriptor. A recent enhancement to the technique is described which involves the localised adjustment of variance in such a way that enhanced internal and external predictability may be obtained. Despite the statistical quality of EVA QSAR models, the main draw-back to the descriptor at present is the difficulty associated with back-tracking from a PLS model to an EVA pharmacophore. Brief comment is made on the use of the EVA descriptor for diversity studies and the similarity searching of chemical structure databases.
Explore the source record for details and available documents.
Comparison of spectroradiometric and meter measurements of a series of ultraviolet radiation sources indicates that a wide divergence between readings can occur. We found that with a xenon arc filtered as a solar simulator producing UV-A (320-400 nm) and UV-B (290-320 nm) radiation, the meter can either over- or underestimate the emission of the source when different cut-off filters are used. The most severe the UV-B meter reading, although the UV-A reading can also reading can reading can also be problematic. Meters should be calibrated used to measure.