Questions important

To be seen to be concerned with environmental questions important for public... 

Prior knowledge of the behaviour of a proposed intermediate under a particular set of reaction conditions is often available and facilitates experimental design. For example, species which are transient under one set of conditions (solvent, temperature) may be stable under others, and then observable by conventional methods. Similar considerations apply to structural variation, which may stabilise charge or unusual valence states. Systematic studies of the effects of variation of conditions, or of structural variation on reactivity, often permit useful extrapolation to behaviour of a proposed intermediate under the conditions in question. Importantly, if extrapolations of this kind indicate that a proposed intermediate would have a lifetime of less than 10 13 s under a particular set of reaction conditions, then that proposal must be re-evaluated. Either the mechanism involving the proposed intermediate is fundamentally flawed, or the bonding changes involved in its formation and destruction are actually concerted. 

Particular questions important to biomonitoring include these ... 

Burchfiel and Duffy, 1982). DHHS (1988) considered these changes to be of questionable importance due to the absence of clinically significant neuropsychological effects. 

It is certainly reasonable to believe that many of the qualitative structural questions important in mineralogy and in solid-state science in general will have fairly simple qualitative answers. While this may not always be... 

Whether or not the prevalence of these myths has to do more with neo-Luddite attitudes towards modem biotechnology or more with a bias towards Old World wisdom is unclear. However, ample evidence collected over the past forty years has demonstrated that the first myth is untenable (4), and the second of limited, if not questionable, import. 

OH)D-la-hydroxylase is found in the inner mitochondrial membrane of the cells lining the proximal convoluted renal tubules. It is a mixed-function oxidase that requires molecular oxygen, a flavoprotein, a ferredoxin, and a cytochrome P-450 for activity. It is inhibited by carbon monoxide. Placental tissue contains la-hydroxylase activity, as do cultured bone cells and macrophages. This finding is of questionable importance under most circumstances, however, since l,25-(OH)2D is not present in significant amounts in nonpregnant, nephrectomized animals. 

The final section examines the biogeochemistry of selected chemical elements. Each of these chapters builds on earlier sections. Thus, the description of carbon will make use of the characteristics of biological systems, definitions of time-scales, and properties of the oceans described in earlier chapters. Five groups of substances are considered in Chapters 11 through 15. Chapter 16 brings us back to some of the questions important to society. 

General Formula for the Representation of Specific Heats.— In concluding this discussion, we shall also deal briefly with the question, important in the sequel, as to how the variations of the mean atomic heats may be expressed for compounds (and also for elements which, like sulphur, behave similarly to compounds). 

At the end of the precipitation reaction, the solid particles must be colloidally stable if a uniform particle-size distribution is to be observed. A question important to final uniformity is the particle size when this stability is achieved. The particles will always feel the long-range van der Waals attractive interactions. Interactions of an electrostatic or solvation origin can give rise to a repulsive barrier that can provide kinetic stabilization. At the end of the reaction, particles precipitated from TEOS and titanium alkoxides have final particle number densities, N , of 1016—1018 m-3. These particles are suspended in a solvent with an ionic strength of approximately 10-4 M and have surface potentials of 10-35 mV. Our studies indicate that the particles also feel a short-range repulsive interaction that we have modeled as a solvation interaction with decay... 

A question important in justifying the use of orbitals alone in qualitative quantum chemistry is will correlation modify the H.F. orbitals i.e. are there orbitals which represent a larger portion of the exact wave function (w.f.) than H.F. MO s do ... 

The isolated cases are not understood, and have been questioned. Importance and management... 

Franck 2008, p. 734 (referring to a United States air force assessment of the 2006 Lebanon War that indicated Israel had lost the war for public opinion by bombing too many targets of questionable importance to its aims, and by not explaining, in convincing terms of mihtary necessity, why it had bombed what it had ). 

It is prudent to understand the nature of the underlying theory so that appropriate application of these properties to difficult reactor optimization problems can be performed. Even if one is not interested in understanding these ideas in detail, it is still powerful to have an awareness of them. Understanding the absolute limits of a system allows us to know where we stand in terms of future improvements. Core results in AR theory are often used in practical applications, yet are hardly questioned. Important practical consequences of the theorems are listed as follows ... 

Another question important for the academic community is What type of training should we provide at universities for the polymer scientists which we need at the turn of the century This is essential to provide the proper manpower which can effectively handle delicate design of polymer structures for advanced applications which are based on macro-molecular design, macromolecular architecture, and macromolecular engineering. 

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