Review of the occurrence and formation of non-volatile N-nitroso compounds in foods.

A review of the literature published prior to July 1991 covers the occurrence and formation of non-volatile N-nitrosamines occurring in foods and beverages. The presence of identified volatile and non-volatile N-nitrosamines accounts for less than 10% of the total apparent N-nitrosamine concentration. N-Nitrosoproline and N-nitrosothiazolidine-4-carboxylic acid are the most commonly identified non-volatile N-nitrosamines in the diet.

Rorschach assessment of purging and nonpurging bulimics.

Research in bulimia has flourished in recent years, and yet minimal attention has been devoted to explorations of the bulimic's basic personality organization. We utilized the Rorschach to differentiate between purging and nonpurging bulimics and controls. There were 15 subjects in each group.

Animals in biomedical research: the undermining effect of the rhetoric of the besieged.

It is correctly asserted that the intensity of the current debate over the use of animals in biomedical research is unprecedented. The extent of expressed animosity and distrust has stunned many researchers. In response, researchers have tended to take a strategic defensive posture, which involves the assertation of several abstract positions that serve to obstruct resolution of the debate.

On the content of arsenic, lead, copper, zinc, tin and iron in bottled fruit, strained fruit pulp and bottled jam produced in Poland.

One hundred and fifty-three samples of bottled fruit, strained fruit pulps and jams contained in glass jars were analysed for heavy metals. All arsenic concentrations were less than the limit of detection of 0.04 mg/kg as were all tin concentrations for which the limit of detection was 8 mg/kg.

HPLC analysis of N-nitrosamino acids and N-nitrosodipeptides N-terminal in proline.

An attempt has been made to develop conditions for the analysis of some N-nitrosamino acids and N-nitrosodipeptides N-thermal in proline by means of high performance liquid chromatography with thermal energy detector (HPLC-TEA). Two HPLC columns have been tested; cyano and amine chemically bonded columns. Although both of them give positive results baseline separation all of the compounds investigated takes place only on the amine column.