Thought propositional

The nature of the acidic sites is still subject of lively discussion. One school of thought, based on a proposition by Thomas (348), attributes the acidity to substitution of AP+ ions for Si + ions in a tetrahedrally linked silica network. Electroneutrality is obtained by addition of protons. Others think that Lewis acid sites, as proposed by Milliken et al. (349), are responsible for the catalytic activity, Gray (350) suggested that only the alumina content was responsible and that a spinel-like phase was formed on heating with protons on certain octahedral positions. 

With a head full of evil spirits such as these, how can a person write It s a lose-lose proposition if ever there was one You re frustrated when you don t write because the job needs doing, but you re frustrated when you do write because the words won t come out just right. As a result, it is quite natural to avoid—or put off—an activity that prompts such a mixture of conflicted, largely negative thoughts under such circumstances, there is little hope of ever enjoying die writing process. 

The atomic theory as originally conceived by Democritus and Epicurus, developed by Lucretius, and resurrected by Gassendi from about 1647 on, was doubtless the source from which Boyle derived his ideas on this subject, as he cites both Epicurus and Gassendi. Boyle, however, in the above proposition carefully avoids any dogmatic assertion of these hypotheses. It is plain, however, that these atoms or corpuscles as he calls them are a constant element of his thought. In part six (an appendix) to the Sceptical Chymist, he states more distinctly his definition of a chemical element. Carneades says 80... 

A foundation piece of work in this area is that of Jacob and Shreyer (1980), who outlined 10 hypotheses that they thought defined user-user conflict. The key proposition in their work is that goal interference attributed to other people s behaviour is the driving force shaping conflict. Many... 

All mammals have the same kind of brain activation during sleep as humans. Whether or not they dream is another question, which can be answered only by posing another one Do animals have consciousness The answer to that question has been hotly debated. Many scientists today feel that animals probably do have a limited form of consciousness, quite different from ours in that it lacks language and the capacity for propositional or symbolic thought. 

The latter proposition is, perhaps, more controversial or more subject to disagreement. What is most efficient from an economic standpoint is not necessarily most efficient from an environmental standpoint. Furthermore, whether efficiency is always good is debatable. In the context of green chemistry, however, efficiency is best thought of as the absence of waste in terms of usage of raw materials and energy. In this sense, the latter proposition is simply the obverse of the former. 

Since the proposition of the lock-and-key analogy by Emil Fischer (1894) several attempts have been done to understand the basis of enzymatic action. The key factor of rate acceleration by enzymes with a factor of 10IW or more (Kraut, 1977) has been thought to be the fit of transition state to the enzyme active site (Haldane, 1930 Pauling, 1946), however, it is still somewhat unclear what do we mean by the term fit. What are the real factors leading to the stabilisation of the transition state ... 

The Opticks was one of the landmarks of modem science. It was written in English, rather than in scholarly Latin, and it was presented as a series of experiments that the readers could do for themselves. Newton was saying, in effect, Don t believe me just because I m an authority. You can do the experiments and convince yourself that I am right. Newton set out a series of propositions and experiments, but he also included a series of questions and observations that he thought were interesting but needed more research. Such was the power of Newton that these questions helped shape the direction of scientific research for several generations. 

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