Volatile metal and metalloid species in gases from municipal waste deposits

We have detected volatile species of silicon, vanadium, arsenic, bromine, tin, antimony, tellurium, iodine, mercury, lead and bismuth in gases released from domestic waste deposits, using inductively coupled argon plasma mass spectrometry (ICP MS). By concurrent aspiration of a multielement standard solution for calibration, the element concentrations in deposit gas are found to be in the range from 0.1 ng m^?3 to 10 μg m^?3 gas. The global amount of some metal species emitted by this process may be of the order of several tons per year. These results suggest a biogeochemical pathway for the transfer of metals into the atmosphere via volatile species. This process may have significant influence on atmospheric cycling of metals as well as on metal toxicity within ecosystems.     

On the mathematical foundations of hyperthermia therapy

Hyperthermia is an aid to standard cancer therapy. The aim is to heat up a tumour region inside the patient's body with the help of microwave radiation. The microwayes are generated by some suitable antenna array. Here we investigate the control properties of such antenna configurations and determine their resolution capabilities. We will define the hyperthermia operator, which can produce every field of any antenna array up to any degree of accuracy. We shall see that this operator is compact and we are able to compute a singular system under general assumptions explicitly. This, together with a detailed knowledge of the decay of the singular values, constitutes the tools with which we treat the previously stated problems. We examine the propagation of microwave radiation in homogeneous media and then carry over the results obtained to the case of inhomogeneous media.     

Ein quantitatives Resultat über Faktorisierungen verschiedener Länge in algebraischen Zahlkörpern

Ohne Zusammenfassung     

Antivirale wirkstoffe,XIX [1] N-(2-adamantyl)-N′-(fluoraryl)harnstoffe und -thioharnstoffe

By nucleophilic addition of 2-aminoadamantane to the appropriate isothiocyanates the following N-(2-Adamantyl)thio-     

The Adamantane Rearrangement of 1,2-Trimethylenenorbornanes. III. AlBr3-catalyzed rearrangement to 2,6-trimethylenenorbornane

From treatment of D-labelled 1, 2exo-, 1, 2endo- and 2endo, 6endo-trimethylene-norbornane ( 1, 2 and 3 , resp.) with aluminum bromide in carbon disulfide, the evidence is gained that a degenerate rearrangement is involved in the admantane rearrangement of both 1 and 2 to 3 .