The use of induced time-dependent Radon-222 behavior, to determine source rate magnitudes, ventilation rates (air change rates) and other parameters that affect Rn-222 and progeny levels and exposure to building occupants, is investigated. Under the conditions of purging the subject space and measuring the build-up (seepage) back into the space, theoretical, normalized equations show aunique, o...

Aniline and o-, m-, and /Moluidine, which are representative of aro matic amines in cigarette smoke, were identified and quantified in human urine. Smokers excreted 3.1 ±2.6 «¿g/24 h of aniline and 6.3 ±3.7 ¿ig/ 24 h of o-toluidine (n = 16). Nonsmokers excreted 2.8 ±2.5 Mg/24 h of aniline and 4.1 ±3.2 un; 24 h of o-toluidine (n = 12). Metaand /»toluidine were detected in the urine of 2 ...

Page 3. It is not entirely clear what causal model the authors have in mind, and specifically whether they consider smoking and air pollution as mediators or confounders of the association between SES and respiratory health. In paragraph two, page 1, they imply mediation (â##â#¦strongly influenced by SES..â##) but in paragraph three, confounding is implied (â##....competing factorsâ#¦â##). This...

Tsukeda et a!. (13) recently published a report detailing experiments where the presumed cytotoxic action of sev eral antitumom agents was measured by a dye exclusion test. Cells were continuously treated with the agents for periods of 4 to 6 days and stained with 0.2% nigrosin every 12 hr. Cell viability was evaluated as a function of dye incorporation. These investigators claimed that their m...

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Three samples of carcinoembryonic antigens were purified from liver métastasesof primary colon cancer. The asparagine-linked sugar chains of carcinoembryonic antigens (CEA) were released as oligosaccharides by hydrazinolysis and the structures of oligosaccharides, thus obtained, was studied in combination with methylation analysis and several limited exoglycosidase digestions. All three CEAs c...