Sensitivity change

Fig. 8-10. Contour maps showing spectrograph sensitivities for the iron Ka line for various positions of the sample, (a) At surface of sample holder, (b) 0.16 inch below surface of sample holder, (c) 0.32 inch below surface of sample holder. The sensitivity changes with the x-ray optical system, with the goniometer setting, and with the distance of the sample below the surface of the sample holder. The contour interval is 20 counts per second. (Authors unpublished results.)...

Ando, K. Johanson, C.E. and Seiden, L.S. Sensitivity changes to dopaminergic agents in fine motor control of rhesus monkeys after repeated methamphetamine administration. Pharmacol Biochem Behav 22 737-743, 1985. 

Figure 10.5 A series of slides printed with dilutions of mouse serum and rabbit serum. There are five replicates of each species, and all slides have identical printing. The secondary antibody cocktail was constructed according to the labels on each slide. This demonstrates that a control slide can easily detect sensitivity changes in secondary antibodies.

If the matrix just causes an additional signal which is the same for all analyte concentrations, the calibration results are not negatively affected. However, a change in sensitivity caused by the matrix may occur if the formation of complexes is hindered or favored by the matrix. In these cases, sensitivity changes in UVA is spectroscopy, and may change for derived techniques like CE/UV. ... 

A problem almost universally encountered in continuous-flow systems is that the instrument response for a given sample assay-value tends to vary with time. This effect, known as drift, affects the accuracy of results. It may be due to several causes, in particular variable performance of analyser components and variations in chemical sensitivity of the method used. It is manifest in two forms, baseline drift and peak-reading drift, which is due to sensitivity changes. The baseline drift may be detected visually if a... 

When the value of k is near to 0.5 or when equal amounts of solute are present in each phase, we evidence the most sensitive changes in kc or v2/V. Also, the fractional amount of total solute, (J), in a given phase asymptotically approaches one or zero for large or small values, respectively of the capacity factor, k. What this says is that when k is large or small, little effect is noted for cj> when a large change occurs in k. Under the above conditions it becomes very difficult to remove the last traces of a component from either phase. It is for this reason that more than five extractions accomplishes little in regard to quantitative separation. Thus, when (1 - ) <0.01, we assume complete separation of solute from one phase to another phase. 

Based on the PVK FDEANST system, the PR performance as a function of the photosensitizer has been studied [54], It is apparent that varying the sensitizer changes the photogeneration rate and greatly influences both optical gain and diffraction efficiency. By replacing TNF with TNFDM, the spectral sensitivity of composites can be extended to the near infrared (IR) region. 

Checks for possible sensitivity changes (due to window transmission) were made during the course of the data acquisition. The maximum sensitivity variation observed over a one hour period of lean engine operation was 2.4 percent change in the mean value. 

Ion-sensitive field effect transistor (ISFET) — In a semiconductor device based on the principle of the field effect transistor (FET) the current between two - semiconductor electrodes (designated source and drain) is controlled by a third electrode, the gate. In an ISFET this gate is modified on its surface in a way which makes the surface ion-responsive (-selective and -sensitive). Changes in the concentration of the species in the solution in contact with the gate surface thus control the current between source and drain. In order to establish proper working conditions a reference electrode (e.g., a -+ REFET) is needed. See also - CHEM-FET. 

Lofgren, Orvar. 1987. Rational and Sensitive Changing Attitudes to Time, Nature and the Home. In Jonas Frykman and Orvar Lofgren, Culture Builders A Historical Anthropology of Middle-Class Life, translated by Alan Crozier, 11—153. New Brunswick, NJ Rutgers University Press. 

Pharmacodynamics Some relevant Changes in receptor sensitivity. Changes in pharmacological effect Considers References 1-5 and SPC... 

It is seen that a sensitivity change is made on the katherometer detector after the carbon monoxide had been eluted. The separation is adequate and is efficiently monitored by the katherometer. 

The significance of such observations may be inferred from comparisons with solvent effects on the rates of other types of reactions, or on the rates of other reactions believed to be within the same mechanistic category or one can undertake the thermochemical work necessary to determine changes in heats of solvation for reactants in various solvents and deduce then how much of the observed solvent effect on reaction rates is due to variations in ground-state energies and how much to solvent-sensitive changes in the enthalpy of solution of the transition structure. 

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