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An important finding of the project is that the degree of molecular interaction of the treated polymers is closely correlated with their hardness , indicating that ion implantation has increased the carbon content of the backbones of the polymer molecules , producing a more rigid structure . If you are one of the people who are a backbone of the class - - who perform at an outstanding level , and without whom the class would not have functioned nearly as well - - I reserve the right to raise your grade accordingly ( usually one notch , from C + to B - , etc. ) . It was sent to the backbone of the Navy , the operating forces , for appraisal and comments . Type 45 is an Anti Air Warfare Destroyer which will in concert with the projected Future Carrier provide the backbone of the Royal Navy 's air defences for much of the first half of the century . The backbone of the business has been New York-based advertising executives acting as intimate partners to the giant corporations they serve . Reading , research , writing , and discussing are the backbone of the teaching .