A common biomarker for average Hg exposure is urinary mercury (U-Hg), expressed either as a concentration (micrograms per liter) or excretion (micrograms per hour or micrograms per gram creatinine) (Hansen et al. 2004; Kingman et al. 1998; Morton et al. 2004; Olstad et al. 1987).
Caspase activity is expressed as change in fluorescence units per microgram protein per hour.
Protein concentrations were determined using the BioRad DC Protein Assay System BioRad Laboratoriess, Hercules, CA, U.S.A ., and caspase activity is expressed as arbitrary units per microgram protein per hour.
Protein concentrations were determined once more after dilutions, and those values used for the final calculation of activity in units of relative fluorescence units (RFU) per microgram protein per hour.
Also, some types of trees emit large amounts of the volatile organic hydrocarbons (VOCs) that combine with oxides of nitrogen to form smog. Ash and maple are among the more VOC-free trees, emitting only about 1 VOC unit (defined as one microgram per hour per gram of dry leaf).
Figure 4 shows the protein profile of the digestions of native parvalbumin, 5 hour Maillard-treated parvalbumin and 12 hour Maillard-treated parvalbumin at pH 2 using 0.1 Units of pepsin per microgram of parvalbumin.
Basic FGF levels (picograms per microgram of protein) were determined using ELISA kits.
Cholesterol mass is reported as micrograms of cholesterol equivalents per microgram of DNA.
