Change of Sensitivity

FIG. 14 Time-course changes of sensitivity (slope of calibration plots) for Na -ISFETs based on sol-gel-derived membranes incorporating bis(12-crown-4) by covalent bonding using (11) ( ) and by encapsulation of bis[(12-crown-4-)ylmethyl] 2-dodecyl-2-methylmalonate (O)- (From Ref 49.)... 

Lalancette, A. et al., Contrasting changes of sensitivity by lymphocytes and neutrophils and neutrophils to mercury in developing grey seals, Develop. Comp. Immunol., 27,735, 2003. 

Ammonia derivative formation The derivatization is carried out using a 10% ammonia solution mixed with the column effluent (64). The main advantages are an increase in sensitivity (1.7 times the signal of the underivatized ochratoxin A), and the availability of a confirmation test for ochratoxin A, as a consequence of this change of sensitivity. A second HPLC pump, similar to that described in Fig. 2 for aflatoxins, and a reaction coil of 10 cm are necessary. Conditions are as follows 0.5 ml/min as flow rate, room temperature, excitation wavelength of 370 nm, and emission wavelength... 

Is there succession with or without an associated change of sensitivity ... 

The first term in Eq. (11.71) shows the change of sensitivity when the systems is approaching thermodynamic equilibrium, while the second term shows the change of sensitivity as the amount of substrate-bound enzyme increases. The elasticity coefficient is a function of the concentrations X0 and X, as well as the relational properties of enzyme Kx, Kx and the reactants K. The displacement from equilibrium X I X()K ) also affects the elasticity coefficient. As the reaction approaches equilibrium, the first term approaches infinity. Therefore, the values of KXq and A V] affect the sensitivity of the enzyme toX0 only if the reaction is displaced from equilibrium. 

Shrinkage control, fabric smoothness, and crease retention durable to many home or commercial launderings are very desirable properties for postcure apparel fabrics. PERMAFRESH 113-B provides these properties while also providing shade change protection and whiteness retention. PERMAFRESH 113-B is also suitable for most precure applications where shade change of sensitive dyestuffs is a major problem. 

Table 14.6 gives the characteristics of several self-powered detectors. Rhodium detectors have the best sensitivity but also the largest bumup rate. Their change of sensitivity with time is important and necessitates a correction before the signal is used for the determination of power. The correction is not trivial because of changes in self-absorption effects in the emitter, and may introduce errors unless the detector is calibrated properly. 

If the baseline shift or the change of sensitivity detected by two consecutive zero/standard samples caimot be neglected, several compensation methods may be applied. Figure 10-27 shows a record of ten CFA samples in steady-state mode preceded and followed by zero/ standard sequences. Both, baseline and sensitivity, differ considerably between the first and the final zero/standard sequence. 

Prior C, Falk M, Frank A (2001) Longitudinal changes of sensitization to farming-related antigens among young farmers. Respiration 68 46-50... 

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