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Experimental and applied study of the isotope geochemistry of light elements ( H , C , N , and O ) , including the following fields : Petrogenesis of basaltic lavas ; geochemistry of mantle rocks ; geothermometry and geospeedometry ; aqueous alteration of meteorites ; experimental study of natural volatiles in the H-C-N-O system at low temperatures ; development of micro-analytical techniques ; atmospheric and environmental chemistry ; paleoclimate research . The ratio of the C , N and H peak areas provides the film concentration , and the sum of the peak areas is the film thickness . The number of atom types is varied on the developed atom type tree with 6 root ( C , N , O , S , P and the halogen type ) and 49 apical atom types . A three-way interaction ( with 3 independent variables and one dependent variable ) is a set of ordered 4-tuples { ( A , B , C , N ) , ... EPMA analysis was done for this V ( C , N ) type layer . However , the transport and transformation of nutrients ( C , N , P , and S ) from recharge to discharge wetlands within the northern prairie ecosystem remain poorly understood , particularly with respect to influences on food web structure and dynamics . Instead of referring to , for example , " the side chain of histidine-34 in the regulatory chain " ( a very meaningful description for a biochemist ) , you might have to say " the atoms in group 270 whose names are not C , N , O or H " . Previous research , demonstrated that C , N and S derived from Phragmites australis dominated marshes of the Mid and Upper Delaware Bay support significant secondary production of juvenile weakfish , especially when fish are between about 20 mm and 60mm SL . The organic matter structure for C , N , P and S are identical , the inorganic components are computed for the specific inorganic compound . We showed a pronounced effect of atom type choice on docking accuracy and proved that splitting of elements C , N and O of the periodic system up to the 18 optimal atom types essentially improves docking accuracy .