Agreement with photoelectron spectra is very close, enabling the clarification of previous assignments, some of which were contradictory. The (anthracene + phenanthrene) system is complicated and non-ideal. Although phenanthrene is the isomeric form of anthracene, its properties are very different, giving phenanthrene greater chemical stability due to the angular position of one of its aromatic rings. Ab initio electron propagator calculations on the lowest vertical ionization energies of anthracene, phenanthrene, and naphthacene have been performed with the partial third order and outer valence Green’s function approximations. Only phenanthrene and anthracene could be resolved. Using an Rxi-35Sil MS column, the five methylchrysene isomers could be re-solved and resolution was achieved for benzo(b)-, benzo (k)-, and benzo(j)fluoranthene (Figure 1B). of phenanthrene and anthracene by this Nocardia species under thermophilic conditions. The TQ-GC demonstrated good linearity over the calibra- The separation of high-purity phenanthrene and anthracene from mixtures obtained in the rectification of the first anthracene fraction from coal tar is considered. The method employed is selective deposition from an aqueous solution of the anthracene-phenanthrene mixture … Both anthracene and phenanthrene seem to be structurally similar, with three aromatic rings. Among these are morphine, codeine and thebaine. Opioid drugs may be of natural origin or derivatives of phenanthrene. Materials and methods Chemicals Organic solvents, phenanthrene, anthracene and benzoic acid were obtained from Merck (Darmstadt, Germany). organic-chemistry aromatic-compounds symmetry pericyclic The middle rings in particular seem to be similarly activated towards cycloadditions. Anthracene =3 benzene rings in a row.---Phenanthrene one benzene ring riding over the second benzene ring-I do not know how to draw. Cultures of Mycobacterium sp. Protocatechuic acid was purchased from Serva (Heidelberg, New York, USA). Soil water content and plant growth stage had significant (p < 0.0001) effects on concentrations of phenanthrene, anthracene and pyrene in winter wheat. strain PYR-1 were dosed with anthracene or phenanthrene and after 14 days of incubation had degraded 92 and 90% of the added anthracene and phenanthrene, respectively. Applications Pharmacology . Phthalic acid, 2,2¢-di-

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