Influence of Physico-Chemical Properties

Influence of Physico-Chemical Properties of the Polymer on its Biodegradability... 

Suzuki Y, Okamoto Y, Morimoto M, et al. (2000). Influence of physico-chemical properties of chitin and chitosan on complement activation. Carbohyd. Polym. 42 307-310. 

Choice of Physico-Chemical Properties - This is based on the general functionality tests enumerated previously. Some of these may be omitted by wise deductions from the general physico-chemical properties of similar products. Final selection of a useful physico-chemical property is dependent not only on the actual properties of the product tested but may also be influenced by economic and market factors. 

Isotopic exchange in most cases does not greatly influence the physico-chemical properties of the total compound. In the case of tritium for hydrogen exchange however, the isotope effect of tritium can influence the pKA of a basic moiety in the vicinity of the tritium atom [1,2]. Although only a small shift in the pKA is observed (0.05-0.1), this can be of great importance for the biological activity of a radiopharmaceutical. 

Rosenqvist, I. T. (1962). The influence of physico-chemical factors upon the mechanical properties of clays. Proc. 9th Nat. Conf. Clays and Clay Minerals, pp. 12-27. 

The main interest in ionic Hquids was first to offer green alternatives to volatile organic solvents. But not only this because of their unique set of physico-chemical properties they are very different from conventional organic solvents. They may give the opportunity to promote reactions that are not possible in other solvents. For example, they offer a nonaqueous environment to substrates and can be poorly miscible with organic compoimds (cf Section 5.2.1). But one would expect more than just a physical solvent new chemistry may be foreseen. Indeed, it has been proven that the nature of the ionic liquid may influence the outcome of chemical reactions [41]. In many cases, ILs contribute to improving reaction rates and... 

The choice of the most appropriate preparation procedure relies on the following considerations. It is well known that the preparation procedure for electrocatalysts influences their physico-chemical properties and thus their activity. The performance characteristics of an electrocatalyst depend on its chemical composition (surface and bulk), structure and morphology. Accordingly, the selected methodology of electrocatalyst synthesis should allow one to address the process for the attainment of a proper structure (crystalline or amorphous) and with a chemical composition on the surface as close as possible to the nominal or bulk composition. 

All the observations made up to now do not give any indication of a noticeable difference in the defect behavior between UO2 fuel, on the one hand, and mixed-oxide fuels on the other. No specific mixed-oxide defect mechanisms have been observed the release mechanisms of fission products from the failed fuel rods are virtually identical for both types of fuel. It is clear that the low plutonium content in the mixed-oxide fuel does not significantly influence the physico-chemical properties of the fuel material (Goll et al., 1993). 

The composition and arrangement of the different monomers in a copolymer strongly influences its physico-chemical properties. Figure 1.2 shows the structure of a linear homopolyuner and the three types of linear copolymer mentioned above. 

Zoeae of the mud crab, Rhithropanopeus harrisii were exposed to a set of structurally distinct organotin compounds consisting of 7 di- and 8 trior-ganotins (TABLE 1). Most are commercially available but several were synthesized specifically for these studies. Selection was additionally based upon an attempt to choose compounds with a range of physico-chemical properties, and whose ligands would differently influence the electronic character of the tin atom. 

In this scenario, it is worth to noting as the different patterns of cell photodamage reflect the partition among specihc sites and cell organelles, the distribution being mainly influenced by physico-chemical properties of the carrier/... 

Commercial PGMs prepared using the phase separation method include porous Vycor glass and Shirasu porous glass (SPG). The main difference between the two is the chemical composition of the membranes, which greatly influences their physico-chemical properties. 

In this mode, the solid is no longer moving. The shifting of the inlet and outlet lines only simulates solid flow, and the solid flowrate downward is directly linked to the shift period. Proper selection of flowrates is required to stabilize the different fronts of species A and B in the proper zones. The adequate choice of the flowrates requires a minimum knowledge of the physico-chemical properties of the system. The influence of adsorption isotherms and plate numbers is simulated by the software. 

Different characteristics of solvents seriously affect the sol-gel reaction in solution. This in turn influences the physico-mechanical properties of the resultant rubber-silica hybrid composites. Bandyopadhyay et al. [34,35] have carried out extensive research on stmcture-property correlation in sol-gel-derived rubber-sihca hybrid nanocomposites in different solvents with both chemically interactive (ENR) and noninteractive (ACM) mbber matrices. Figure 3.12 demonstrates the morphology of representative ACM-sihca and ENR-sihca hybrid composites prepared from various solvents. In all the instances, the concentration of TEOS (45 wt%), TEOS/H2O mole ratio (1 2), pH (1.5), and the gelling temperature (ambient condition) were kept unchanged. 

It must be realized that the acidity of an acidic solution, expressed by its pH, is a physico-chemical property, which in fact (see calculations on pp. 83-85) represents a resultant of the identity and concentration of the acid even the overall pH height of the titration curve is still influenced by the concentrations of a strong acid, but for a weak acid that curve height, especially its h.n.pH value, forms a fairly reliable identity indication. 

The use of models that mimic a protein active site is normally prompted by the desire to eliminate any influence of the polypeptide backbone surrounding the active site in real biological molecules, which may obscure its physico-chemical properties. The first attempts to synthesize metal complexes similar to the active site of haemoproteins, through the use of simple metalloporphyrin derivatives, failed. The failure was due to the fact that these complexes react irreversibly with dioxygen as a consequence of side autooxidative reactions of the type ... 

The redox potential of an electron transfer process involving a metal complex is influenced by various factors typically, in addition to the many times cited inductive effects of the ligands (together with the eventual substituents of the ligands themselves) and the stereochemistry of the redox couples, the degree of solvation of the complex and the temperature also play an important role. In an attempt to rationalize the effects of these factors on the redox potential, as well as the relationship between the redox potential and the spectroscopic properties of the complex, linear correlations between redox potential and widely differing chemical and physico-chemical properties have been investigated. 

Comparing the results of entries 1-3 in Table 3, one can see that the reaction requires a pressure of about 100 bar of hydrogen to proceed to completion in the absence of CO2. In contrast, a partial pressure of 30 bar of H2 is sufficient in the biphasic IL/SCCO2 system. This striking difference results from the significant influence of the compressed CO2 on the physico-chemical properties of the IL phase. 

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