Normalization of the above absorbances
is carried out according to the following equations:
of samples were scanned (Beckman DU-800) from 350 to 550 run in 1-mL airblanked quartz cuvettes.
There was a significant difference between raw absorbances
of the control plasma extract and the treated dams at 24 hr, with a 10-fold dilution each (p < 0.005; Figure 2).
Samples containing talc (whose particle size of >1.0 [micro]m exceeded that of the acrylate stickles used) were allowed to settle for a day prior to the zeta measurement; the absorbances
of the other samples were taken immediately upon sampling.
In attempts to correlate the density with the MR spectra, the correlation coefficient between polymer densities and the scaled absorbances
of fourteen grades were calculated.
The collected fractions were pooled and concentrated, and the absorbances
were measured at 235, 280, and 560-nm with a spectrophotometer (Pharmacia Ultraspec III).
Real-time NIR monitoring of the syrup is possible because absorbances
of DEs fall within the NIR spectrum of 900 to 1,800 nanometers.
To justify using the differential thermal lens system for indirect detection, we measured the changes in absorbance
at the 2 x 10( sub-7) level with background absorbances
of 0.05 au.
(3)) depends on two factors, the first factor contains terms which depend on the measured absorbances
inside (subscript 1) and outside (subscript 3) the IS detector, and the second factor contains a ratio of the detection efficiency at the excitation, [lambda], and emission, [[lambda].sub.f], wavelengths.
of all the dilutions were taken after 30 minutes at [lambda] max 517nm using methanol as blank.
Moreover, modern spectrophotometers are sufficiently stable that even a single-beam instrument, in which the absorbances
for irradiated and nonirradiated specimens for each time period are measured individually, will allow accurate determination of the absorbance
of vibrations at 821 [cm.sup.-1] and 1566 [cm.sup.-1] vanished and appearance of new vibrations at 1740 [cm.sup.-1] were noticed.