Summary of Mechanism

The mechanistic conclusions may be summarized as follows, reference being made to the classification of processes at the beginning of Section X,A,1. The basic reactions are five heterolytic dissociative adsorptions and one reaction analogous to a ligand insertion reaction. The first five reactions below represent reaction of Cr3+(cus) + 02 (cus) with deuterium or a hydrocarbon. 

In general, the sites are not simple pair sites but involve additional surface species. In the absence of hydrocarbons, migration of deuterium atoms between sites or adjacency of sites must be assumed for sites A and D (which we tentatively assume are the same) because H2 + Dz = 2 HD is very fast. However, reaction (—I) is slow in the presence of hydrocarbons on sites A (and D). Adsorbed hydrocarbon residues largely or partially block sites which permit Hz + Dz = 2 HD. Alkane is an exception. 

Reaction (—1) is inhibited by hydrocarbons except alkane. The sequence, reaction (VI) + (—V) is fast. Reaction (II) occurs and particularly rapidly on set A sites of the type found on a-CrzOz but, since ( — 1) is inhibited, no exchanged olefin is formed. On a-CrzOz, the second stage of (II) is slow with respect to the first. Reaction (III) is fast but not all of (III) leads to benzene-d because (—1) is largely inhibited. 

Reaction (—1) remains fast. The second stage of (II) is fast versus the first and olefin released by associative desorption is so held as to be likely to readsorb heterolytically or by (VI). The rate of (II) is rather fast versus (VI) + (—V). Reaction (IV) is fast. These sites are probably in small micropores which are lost in activation beyond 300-350°. It is assumed that binding of adsorbed ally -, benzyl-, and olefin is stronger in micropores. 

Reaction (—1) is strongly inhibited. Unlike set A, the hydrogen atom attached to OH- by the first stage of (II) is incorporated into 

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TABLE 17-2 Summary of Mechanisms and Parameters in Aerosol Deposition... 

Fig. 2. Summary of mechanical properties of composites containing various fillers...

FIGURE 31.16 Summary of mechanical barrier approach for basement foundations. (Adapted from U.S. EPA, Radon-Resistant Construction Techniques for New Residential Construction—Technical Guidance, EPA/625/2-91/032, U.S. Environmental Protection Agency, Washington, DC, February 1991.)... 

Summary of Mechanical Testing Results of Precharged Steels with High-Pressure Gaseous Hydrogen at 20,000 psi and 100°C for 8 Days... 

Figure 22.17 Summary of mechanisms to maintain the ATP/ADP concentration ratio in hypoxic myocardium. A decrease in the ATP/ADP concentration ratio increases the concentrations of AMP and phosphate, which stimulate conversion of glycogen/ glucose to lactic acid and hence ATP generation from glycolysis. The changes also increase the activity of AMP deaminase, which increases the formation and hence the concentration of adenosine. The latter has two major effects, (i) It relaxes smooth muscle in the arterioles, which results in vasodilation that provides more oxygen for aerobic ATP generation (oxidative phosphorylation). (ii) It results in decreased work by the heart (i.e. decrease in contractile activity), (mechanisms given in the text) which decreases ATP utilisation.

Summary of mechanisms of actions of NSAIDs as transcriptional regulators on the functional and molecular level... 

Summary of mechanism. Taking into account the data in hand (and that which follows), it is possible to classify the many processes which occur in molecular SIMS in a qualitative manner. Table II, while not complete, illustrates many of the processes which contribute to molecular SIMS, FAB, and LD spectra. The following synopsis of the mechanism complements the material in Table II ... 

There are also other types of drug interactions, including impaired uptake of drugs from the GI tract and altered renal clearance, for example. A summary of mechanisms by which nutrients and drugs can influence each other is shown in... 

Figure 26.2. Summary of mechanisms involved in the formation of conjugated fatty acids.

Table 4.2. SUMMARY OF MECHANISMS OF ACTION OF ANTIBIOTICS AGAINST NON-SPORULATING BACTERIA...

Summary of Mechanical Properties of Bone, Dentine [3], Hydroxyapatite [3], and CBPCs. 

D. Summary of Mechanism Studies.—The recent research does not solve old problems. There are areas of disagreement in the findings, no doubt due to different catalysts and experimental conditions. No single primary product can be identified. Carbon oxides are often the major products leaving the catalyst surface, in relative concentrations dependent upon the efficiency of the catalyst for the CO shift reaction (4). On Rh the CO content tends to be high and the CO 2 low, probably indicative of lower activity for the shift reactions compared with Ni, where CO tends to be lower. Methane however can be formed directly from the higher hydrocarbons at 600 °C and above, as well as by methanation of carbon oxides. 

Table V-1-3. Summary of Mechanisms of Protein Synthesis Inhibition...

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