Comparison of absorption

A. Scheggi, F. Baldini 1986 Comparison of absorption, reflection, and fluorescence... 

Figure 1. Comparison of absorption (top) and EPR (bottom) spectra of normal tetragonal copper(II) and oxyhemocyanin.

Brandts and Hunt 336) and of Hermans and Scheraga (337). Figure 12c show the comparison of absorption and rotation estimates of the extent of the transition. In this case two different measurements appear to be influenced to the same extent by the change in structure. The change in fluorescence also appears to follow the absorption change (308). 

Bergstedt, S.E., et al. 1990. A comparison of absorption of glycerol tristearate and glycerol trioleate by rat small intestine. Am J Physiol Gastrointest Liver Physiol 259 G386. 

Tomita, M., M. Hayashi, and S. Awazu. 1994. Comparison of absorption-enhancing effect between sodium caprate and disodium ethylenediaminetetraacetate in Caco-2 cells. Biol Pharm Bull 17 753. 

Figure 3 Comparison of absorption and fluorescence (inset) spectra of different classes of C6oderivatives themethano-C6oderivative l -carboxy-l,2-methano[60]fullerene the pyrrolidino-C6o derivative N-ethyl-trans-2, 5 -dimethylpyrrolidino[3, 4 l,2][60] fullerene 33 (Fig. 24) (- - -),[B14al the C60 derivative 2-hydroxy-tetrahydrofu-ran[4, 5 l,2] [60]fullerene (—), and the amino-C60 derivative 3 (Fig. 4) AW -dimethyl-piperazine [2, 3 l,2][60]fullerene (-). (From Ref. 65.)...

Comparison of absorption spectra before and after quaternization provided unambiguous proof that the quaternization had occurred. Immersion of the SAM shown in... 

Appropriate Response. It was assumed that the structure of the impurity is similar to that of the standard, since the impurity is a simple hydrolysis product of the standard. The portion of the molecule affected is distant from the chromophore, therefore the absorptivities of these compounds can be considered similar. (Note If necessary, an experiment can be run in which a single-point comparison of absorptivity can be made for the impurity and standard.)... 

Using the frozen excitation model to analyze the data shown in Fig. 3, and calibrating the system via Rayleigh scattering (8J, a total OH number density of 4 x 1C>16 cm 3 was calculated for an assumed flame temperature of 2000 K in the methane-air torch. Nt was not compared directly with the results of absorption studies future flat flame burner studies will involve direct comparison of absorption and fluorescence. 

Similarly to the case of the triatomic species (Section III), comparison of absorption maxima of stable germylenes, stannylenes and plumbylenes bearing the same substituents at different divalent atoms of the Group 14 elements (Table 4) does not reveal any... 

Table 8-3 Comparisons of Absorptivities of Various Surfaces to Solar and Low-Temperature Thermal Radiation as Compiled from Ref. 14.

COMPARISON OF ABSORPTION AND EXCRETION OF Zn-65 IN NORMAL VOLUNTEERS AND IN PATIENTS WITH SUBACUTE Zn DEFICIENCY... 

In laboratory experiments S-MIF has been observed in photolysis of SO2 [14,15] and CS2 [19], but negligible to only very slight MIF is seen in H2S photolysis [20]. Elemental sulfur (Sei), or a CS c polymer in the case of CS2, is produced in all three photolysis experiments by a complex sequence of photolysis, bimolecular and trimolecular gas phase reactions, and wall reactions. Comparison of absorption spectra for SO2, H2S and CS2 reveals vibronic structure in SO2 and CS2 spectra but very little structure in the H2S spectrum (Figure 5.1), and suggests that the act of photodissociafion of the parent gas could be the source of S-MIF for SO2 and CS2. 

In addition, in vitro stndies can be nsed for semiqnantitative comparison of absorption of chemicals between species, between componnds within one species, and between different vehicles within one species. In this regard, it is important to realize that in vitro stndies give relative resnlts, i.e. that they should primarily be compared with results generated within the same test system. Various calculations can be made on the basis of in vitro data, dependent on the dose applied (infinite versus finite dose). The maximnm finx (derived from the linear part of the absorption versns time cnrve) may be nsed to semiqnantitatively compare absorption between species, componnds or vehicles, based on finite dose experiments. In this case, attention shonld be paid to the differences in maximnm flux values at relevant exposure levels. For example, if at 200 p.g/cm the flux through rat skin is ten times higher compared to hnman skin, bnt flnxes are comparable at the more relevant dose level of 20 p.g/cm, there shonld be no correction for differences in skin permeability in health risk assessment. 

Comparison of Absorption Data. Little correlation was found between the absorption data obtained with the hemoglobin incorporation and fecal monitoring methods with or without correction for PEG recovery (Table VII). There are several possible reasons for this poor correlation. 

Figure 12 Comparison of absorption spectra for nickel(II) in the IDA chelating A-1 resin phase and in the solution A Muromac A-1 (100-200 mesh, Na form) spectrum at 26% Ni loading and external pH 6.1 with 1-mm cell thickness B same as A with 2-mm cell thickness C solution spectrum for Ni aqua ion D solution spectrum for Ni(IDA) complex E solution spectrum for Ni(IDA) " complex.

Fig. 10 Comparison of absorption rates of ibuprofen from Softgel and tablet.

A. Rousseau, F. Leger, Y. Le Meur, F. Saint-Marcoux, G. Paintaud, M. Buchler, and P. Marquet, Population pharmacokinetic modeling of oral cyclosporin using NONMEM comparison of absorption pharmacokinetic models and design of a Bayesian estimator. 

A comparison of absorption of selenium by selenium-depleted rats after oral administration of sodium selenate, selenomethionine, or methyl selenocysteine (from high-selenium broccoli) found that gross absorption of selenium from methyl selenocysteine was significantly lower (85%) than from sodium selenate or selenomethionine (91%), further, true selenium absorption adjusted for urinary excretion was significantly different for methyl selenocysteine, sodium selenate, and selenomethionine, with the lowest absorption for methyl selenocysteine and the highest for selenomethionine (Finley 1998). Absorption of selenium from selenomethionine was not significantly lower than from sodium selenate. 

Figure 6 Comparison of absorption cycle for samples with and without post mold curing and exposed to water immersion at 100°C.

Comparison of Absorption Spectra of Quinones in Solution and Adsorbed on Lignin-Containing Pulp... 

Yamaguchi, T., C. Ikeda, andY. Sekine. 1986a. Intestinal absorption of a beta-adrenergic blocking agent nadolol. I Comparison of absorption behaviour of nadolol with those of other beta-blocking agents in the rat. Chem. Pharm. Bull. 24 3362-3369. 

Fig. 4. Comparison of absorption and fluorescence spectra of hexadecaheptaene (7a), a C30 spheroidene (7b), and /3-apo-12 -carotene (7c). Spectra were obtained at 77 K in an EPA glass (ether/isopentane/ethanol, 5/5/2, v/v/v). Electronic origins are designated by asterisks.

The success of this direct comparison of absorption and photocurrent spectra provides a convincing demonstration of the potential of photocurrent spectroscopy as a quantitative method. The results show that the collection efficiency of photogenerated charge carriers can approach unity, even in polycrystalline anodic layers, which might be expected to contain a high density of defects that can act as recombination centres. 

Fig. 11. Comparison of absorption spectra of alkaline solutions of proteins and of mixtures of tyrosine and tryptophan. The curves, obtained with an automatic recording spectrophotometer, are displaced along the vertical axis to avoid overlapping.

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