We generalize a theorem due to Dirac and show that every Meyniel weakly triangu-lated graph has some vertex which is not the middle vertex of any P 5. Our main tool is a separating set notion known as a handle.

C. Supporting Statement For comparison and completeness of this proposal Latimeria chalumnae is also discussed. Coelacanths (Latimeria spp.) are the sole survivors of an ancient Devonian lineage of crossopterygian fish, which played a pivotal role in the evolution of land-living tetrapods. The species with the extremely slow evolutionary rate and an enormous evolutionary age represents the clas...

Dose rates in air and at various depths in tissue produced by concentrations of natural isotopes in the ground are calcu lated for both beta and gamma radiation. Calculated gonadal "screening factors" are within k$ of the experimental values reported by the British Medical Research Council*

["rozen phrases are introduced as a new level of automatic proofieadiltg in between the stm,dard level of spelling verification tfl ist)lated words and tile levcl of grammar checking. The design and the iulplenlentatioll of a corresponding proofleading system are described in detail.

Coombs Hill, a new fossil locality in the Witpoort Formation (Witteberg Group) of South Africa, preserves record Famennian (Late Devonian) life Gondwana. Fossil plants collected at Hill are preliminarily assigned to several classes. Shelly invertebrates include variety bivalve mollusc forms, some which appear be preserved position. Biodiversity is comparable that well-known Waterloo Farm lagers...

abundance and multilateral extension of prominent genus and species of brachiopoda in the majority of sedimentation series of the late devonian have been observed in all parts of iran. the variability and rapid change in this respect has made it possible to delineate different lines of orthogenetism, biozonation and present biostratigraphical models at the sub-stage level. these characteristics...