Search results for "Long term retention"
showing 2 items of 2 documents
On the measurement of consistent long-term retention factor values in micellar liquid chromatography
2007
Abstract In the field of the quantitative structure–retention and retention–activity relationships (QRAR and QSRR) is crucial to obtain consistent retention factors (k). For this purpose, two unbiased approaches to estimate k are used: (i) the IUPAC approach (based on the extra-column time correction) and (ii) the ‘2-references’ approach (based on the k estimation respect to two prefixed reference k values). Three reference chemicals were selected attending to their retention time, chemical stability and non-ionic character. Consistent retention factor values for these references were estimated for C18 chromatographic columns and Brij35 solutions as mobile phases after statistical analysis.…
Effect of Material Organization on Memory in an Incidental Learning Task Performed under Repeated Maintenance
2009
The present paper investigates the effect of organizational variables on long term retention of material recycled under maintenance rehearsal. Subjects repeated a series of words as a distracting task, expecting to be tested on the recall of numbers (GLENBERG & ADAMS, 1978). An unexpected test on the recall of words showed the superiority of the recall of organized words, and a significant interaction of organization by time spent in repetition of the distractor material. The present experiment, because of the requirement of written, and not oral, repetition of the distractor material, is a more stringent test of the postulated consequences of type I rehearsal according to leve1 of processi…