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By Jerome O Nriagu

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Two deep-cooling generators are employed for each room, where one alone would be sufficient to maintain the necessary temperatures. In the event of a general power failure, the generators can be supplied by an emergency power unit; if this generator fails, liquid nitrogen at a temperature of À 196 1C can be conveyed directly into the freezing rooms. Since 2006, the human specimens have been stored under stable deep-freezing conditions in the gaseous phase above liquid nitrogen at a temperature of À 150 1C (Figure 7).

The decrease in Hg body burden seems to be due to a better dental status of the students, lesser use of dental amalgam, and in case of amalgam fillings the usage of non-g-2-amalgam with a better Hg ligation. The increase in Cu in female blood plasma results primarily from the use of birth control pills. 0 1985 1988 1990 1992 1995 1997 1999 2001 2003 2005 1986 1989 1991 1993 1996 1998 2000 2002 2004 2006 Error bars: 95% CI Figure 9 Real-time monitoring: hexachlorobenzene (HCB) concentrations in blood plasma of 20–29-year-old German male and female students of the Environmental Specimen Bank for Human Tissues (ESB-Human).

Only rarely exceeded; no clusters concerning gender or location site are identifiable. Between 1985 and 1991, PCP concentrations in blood plasma regularly exceeded the HBM-I and HBM-II values; no clusters concerning gender were identifiable. In 1985 and 1986, more than 20% of the males and females exceeded the HBM-I value for PCP in blood plasma and approximately 2% exceeded the HBM-II value. In 1986, 12% of the females exceeded the HBM-II value for PCP in blood plasma. Since 1987 the frequency of exceedance of the HBM-I value for PCP in blood plasma has decreased considerably by approximately 3–5% per year.

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