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He reasoned that the authority for the tribal prosecution and the federal prosecution derived from a single source - " the legislative authority of the federal Congress exercising , with the President 's approval , the power of the United States . If a component is identified as fatty acid ( s ) or abietic acid ( s ) of known structure derived from rosin or tall oil , such acids are classified on the basis of their structure . Dark brown areas represent rocky material derived from the interior , implanted by impact , or from a combination of interior and exterior sources . Over the past decade , Ma and his research team have been developing a novel chemical reactor that uses an ultra-thin membrane made from palladium to separate hydrogen derived from natural gas or renewable sources , such as corn . With 30 per cent of regional GDP derived from agriculture and 54 per cent of the labor force engaged in agricultural activities , this sector must become more productive if we are to strike at the heart of hunger and food insecurity .