Isoelectric focusing (IEF) is a powerful approach in separations of zwitterionic substances such as proteins, peptides and amino acids. It is important in proteomic research. Generally, in IEF, carrier ampholytes (CAs) are necessary to establish a stable pH gradient. However, CAs also bring attendant problems such as a decrease in detection sensitivity and suppression of ionization of analytes ...

In four experiments, we investigated the time course of attentional focusing. Our main aims were to estimate the time necessary for focusing to take place and the time over which focal attention can be maintained. The use of a pre-cueing procedure allowed us to estimate the time necessary for focusing, excluding the time needed for orienting. The results of the ® rst three experiments showed th...

abundantly clear though the need for effective eclectic techniques for enhancing learners’ vocabulary learning strategies may seem, in practice, language instructors, by all accounts, tend to resort to only a few obsolete ones. this review paper aims to provide a brief account of practices in vocabulary teaching and learning by focusing on the research on teaching words in context and out of co...

We examined two aspects of temperamental approach in early infancy, positive reactivity and anger, and their unique and combined influences on maternal reports of child surgency and attention focusing at 4 years of age. One hundred and fourteen infants were observed for their positive reactions to novel stimuli at 4 months, and their anger expressions during arm restraint at 9 months. Child sur...

The virtual keys have caused many changes in the development of online classes, we present a mechanism to be able evaluate attention students, presented through characteristic value that is from 0 100%, as well meditation characterized moment student distracted, these parameters are evaluated using BCI device and numerically, experimentation was carried out 45-minute where results allow evaluat...