Due to its high reactivity it is never found in its elemental form in nature.
It combines directly at both ordinary or elevated temperatures with all other elements except oxygen, nitrogen, and the lighter noble gases (Cotton & Wilkinson, 1980).
Formally, the problem can be stated as follows: given N points in the Euclidean plane, find the minimum spanning tree that covers these N points.
Additional points besides these N points can be added to the tree as extra vertices…The SMT is a very interesting problem both in theoretical computer science and many practical applications.
When you have decided what stage of the Introduction they belong to, refer to the stages in a thesis introduction and give each sentence extract a number.
Then check the suggested answer to see if your answer agrees with ours.
The main source of elevated fluoride in plants comes from atmospheric industrial pollution.
Because of its extensive industrial use, hydrogen fluoride is probably the greatest single atmospheric fluoride contaminant and is generally considered to be the most important plant pathogenic fluoride (WHO, 1984; Treshow, 1965)…
This analysis showed that for nine species, photosynthesis measurements indicated greater sensitivity than was obvious from visible assessment, and for seven species the converse applied.
This indicated that, while it may generally be true that physiological responses occur at lower doses than visible injury, this does not always appear to be the case.…This is consistent with the findings of Weinstein (1977) that the extent of foliar damage is not always correlated with the level of accumulated fluoride.