x-ray microanalysis , with on-line computation of elemental mass fractions was used to determine the levels of chromatin-bound phosphorus ( nucleic acid ) , sulphur ( proteins ) and divalent metals ( ca , fe , ni , cu and zn ) in cells of glenodinium foliaceum ( stein ) , fixed only in glutaraldehyde .
C0013879
elemental
C0031705
phosphorus