Priorities characteristic groups

For nomenclature purposes, substituents can be divided into those that are always cited as prefixes (e.g. chloro-, alkoxy-) and those which can be cited as either prefixes or suffixes e.g. oxo-/-one, carbamoyl-/-carboxamide). If any of the latter are present, the name will normally contain a suffix. However, only one kind of group can be cited as suffix, and this is chosen according to a strict order of priorities. The group thus selected is known as the principal characteristic group . 

Polyfunctional compounds that contain C-C double and triple bonds have characteristic suffixes to identify them, as shown in Table B.2. The higher priority functional group is assigned the lower number. 

IR-2.15.3.3 Ordering characteristic groups for substitutive nomenclature IR-2.15.3.4 Ordering ligands in formulae and names IR-2.15.3.5 Ordering components in salt formulae and names IR-2.15.3.6 Isotopic modification IR-2.15.3.7 Stereochemical priorities IR-2.15.3.8 Hierarchical ordering of punctuation marks IR-2.16 Final remarks IR-2.17 References... 

From the wide variety of emerging pollutants of industrial origin that could be considered here, bisphenol A (BPA) and phthalate esters (PE) are of especial relevance not only because of the high volumes produced and their widespread use, but also because of their demonstrated toxicity, particularly as endocrine disrupters. Both of them have been included in the final report of the European Commission toward the establishment of a priority list of endocrine disrupter chemicals, EDCs [3], and have been rated as of high risk of exposure for human and wildlife populations. Because of their structural characteristics these compounds cannot be included in any of the groups described above, so they will be described in this section (see Fig. 10). 

A small-scale operation of this type was conducted during the Asian influenza threat (1957-1958). At first, it seemed like an almost insurmountable task. How to alert, inform, and protect 180,000,000 people from a disease that might occur within the next several months How to meet the many technical problems of the detection and isolation of the virus, the type and potency of a vaccine, the mass preparation of vaccine, the orderly distribution of vaccine, the adoption of priorities for vaccination The medical and health professions had to be given scientific information concerning the threat and its characteristics. The public had to be alerted and informed. Many of us working in the fields of civil defense and aware of the small public response to our best efforts looked askance at the Asian influenza challenge. Perhaps the smallness of the groups that came for instruction in civil defense in spite of best efforts chilled our ardor for the task ahead. 

Every drinking water supply system has its own individual characteristics (most importantly, the corrosivity of the water supply and the extent of occurrence of lead pipes), albeit generic groupings do help to develop corrective strategies and set priorities. 

Sites will not he ranked relative to one another. Sites will be classified on their individual characteristics and will he placed into classes (Class 1, 2, 3, or N, according to their priority for action, or Class I for sites that require further information before they can he classified). The classification groupings arc as follows ... 

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