Some Tentative Conclusions

Althou sufficient data to provide thorough tests of mechanism are lacking, it is possible to make some tentative conclusions. Sets 15-67, 15-69, and 15-71 give highly significant correlations with eq. (30). These sets include both monosubstituted and disubstituted dienophiles. Obviously, then, both mono-substituted and disubstituted dienophiles lie on the same correlation line and have the same values of a and 3. It therefore seems likely that these sets undergo a concerted mechanism. 

Although the NBS standards were collected from several sources, some tentative conclusions can be reached concerning the combustion process. Using selected elements for comparison which are of a refractory nature and would be expected to be conserved in the ash following the combustion process, it becomes apparent that other elements such as selenium and antimony are not being conserved, but rather are lost from the ash. Refractory elements selected for illustration are Eu, Hf, Sc, Ta, Tb, and La, although most other elements display the same conservative behavior. Table VI shows the concentrations of these elements in both... 

The lattice resistance of the two crystal forms of AIN is not known. However, some tentative conclusions can be made by assuming that the lattice resistance at room temperature is close to the Peierls stress (Peierls, 1940), which agrees with experimental observations of a wide range of materials to within a factor of 3 and is given by... 

As to the absorption values in the literature (see Table 14.1) some tentative conclusions may be drawn ... 

The available experimental data on the dual-mode sorption and mobility parameters have been summarised in Table 18.13. Their number is too small to derive correlations with the chemical structure only some tentative conclusions can be drawn. Dd and S may be estimated along similar rules as D and S in Sect. 1. From Table 18.13 we may conclude that the values of a and F are of the order of 0.4 and 0.15, respectively. The parameter Cf, remains as the great "unknown". Barbari, Koros and Paul (1988) suggested that Cf probably would be proportional to the fractional volume of the holes as a measure... 

Some tentative conclusions about the nature of these conformational differences may be drawn from the crystallographic studies of Cu2+ and oxalate-substituted lactoferrins (26,192,193). Anions which gave class A spectra with V02+-substituted transferrins are those that can... 

Knowledge of interest comes historically from two separate fields, thermionic emission and electrochemistry. The work on semiconductor surfaces comes later and, in a sense, bridges these older disciplines. The problem of giving a definite introduction to these vast fields is a broad task indeed and perhaps beyond the scope of this occasion. I will only try to sketch in what appear to me to be the high spots, and end with some tentative conclusions about semiconductors in simple electrolytes. 

Summary The rich variety of the coordination chemistry of silicon is discussed and some theoretical issues are raised. In an attempt to understand further the underlying chemistry, some thermodynamic and kinetic parameters for the formation and substitution of pentacoordinate silicon compounds have been measured by NMR methods. Values of -31 3 kJ mol for SHand -100 10 J K mor for A5-were measured for the intramolecular coordination of a pyridine ligand to a chlorosilane moiety. A detailed kinetic analysis of a nucleophilic substitution at pentacoordinate silicon in a chelated complex revealed that substitution both with inversion and retention of configuration at silicon are taking place on the NMR time-scale. The substitution with inversion of configuration is zero order in nucleophile but a retentive route is zero order in nucleophile at low temperature but shows an increasing dependence on nucleophile at higher temperatures. These results are analysed and mechanistic hypotheses are proposed. Some tentative conclusions are drawn about the nature of reactivity in pentacoordinate silicon compounds. 

We shall leave this problem for a while. We next discuss some aspects of the solvation Gibbs energy of protein, and at the end of this section present some tentative conclusions regarding the molecular reasons for the solubility of proteins. 

Some tentative conclusions can now be drawn regarding the way in which silica is released from Mattole soils. The linear relation between silica concentration and the square root of time in soil and sediment suspensions, where dissolved silica is less than about 1 mg/liter, suggests that a diffusion mechanism controls the release of silica from mineral particles. Such a mechanism would be in agreement with studies by others (14, 17, 18). Those studies suggest that in the initial release of silica from feldspar only a diffusion mechanism would be apparent, but as the silica concentration increased a subsequent sorption (precipitation ) reaction on the altered solid surface would slow the net release of silica until a relatively steady condition existed. This appears to be a pattern that would explain the silica released from both low and high concentrations of prewashed Mattole soil and sediment in water. 

This work, although a modest beginning in our eflFort to understand the geochemical balance of a small watershed, permits us to draw some tentative conclusions ... 

Who became members of the RKhO We can draw some tentative conclusion based on the membership lists printed in each volume of the society. However, only for some years do the lists contain information about the occupation of the members and where they lived, and even then not every member s occupation is identified. Still, these lists can provide us with valuable information about individuals that is often very difficult to find otherwise. In the original statutes (1868), individuals could become members of the RKhO if they were teachers of chemistry or if they had published a work on chemistry or had written a manuscript work on chemistry. Apparently, these requirements... 

The EPR spectrum of in solution consists of a broad single line. This author has analyzed the temperature and frequency dependence of the line-width of the aquo, cacodylate, and bovine serum albumin complexes of Gd , (Reuben, 1971b). Only some tentative conclusions could be reached regarding the symmetry of the macromolecular environment of the ion. The line-width is related to the electron spin relaxation time and EPR data might be useful for the determination of the effective correlation time in PRR experiments. 

We will now draw some tentative conclusions on the social embedding of quan turn chemistry in Germany and the USA, >cusmg on the aspects of genealogy, physical homeland, external recognition and shared values. 

In view of these six passages, we can draw some tentative conclusions regarding the identity of The Other in Isaiah 56-66. 

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