Mass spectra deconvolution of low, medium, and high volatility biogenic secondary organic aerosol.

Secondary organic aerosol (SOA) consists of compounds with a wide range of volatilities and its ambient concentration is sensitive to this volatility distribution. Recent field studies have shown that the typical mass spectrum of ambient oxygenated organic aerosol (OOA) as measured by the Aerodyne Aerosol Mass Spectrometer (AMS) is quite different from the SOA mass spectra reported in smog chamber experiments. Part of this discrepancy is due to the dependence of SOA composition on the organic aerosol concentration.

Evaluation of mutagenicity testing with Salmonella typhimurium TA102 in three different laboratories.

Thirty compounds of various chemical classes were investigated for mutagenicity in a collaborative study (three laboratories) using Salmonella typhimurium TA102. With five compounds, hydrazine sulfate, phenylhydrazine, hydralazine, glutardialdehyde, and glyoxal, mutagenicity was detected by all laboratories. Formaldehyde was assessed as weakly mutagenic in only one of three laboratories.

[Chronic pancreatitis of the head of the pancreas in hyperplasia of the body and tail of the pancreas].

We report a case of chronic pancreatitis of the head of the pancreas complicated with insulin-requiring diabetes mellitus, in a 44-year-old woman with hypoplasia of the dorsal pancreas. Preoperative ultrasonography, computerized tomography and angiography revealed a calcifying retroperitoneal mass, which on explorative laparotomy proved to be a severe chronic pancreatitis of the head of the pancreas with a finding of abnormal visibility of the confluens venosum and absence of both the corpus and the tail of the pancreas. The postoperative course following pylorus-preserving duodenopancreatectomy was uneventful.

Collaborative study of mutagenicity with Salmonella typhimurium TA102.

Thirty compounds of various chemical classes were investigated for mutagenicity in a collaborative study (3 laboratories) using Salmonella typhimurium TA102. With 5 compounds, namely hydrazine sulfate, phenylhydrazine, hydralazine, glutardialdehyde and glyoxal, mutagenicity was detected by all laboratories. Formaldehyde was assessed as weakly mutagenic in only 1 of 3 laboratories.