to date, no comprehensive study has been carried out on the chironomid larvalidentification in running waters of the country, in particular in large rivers. therefore, this article is thefirst of its kind in iran that has come out in english. samples were collected in 9 sites from thezayandehrood river a distance of 230 km down the zayandehrood dam. the sampling was repeatedfour times: november...

The classical multiplicative (Hirzebruch) genera of manifolds have the wonderful property which is called rigidity. Rigidity of a genus h means that if a compact connected Lie group G acts on a manifold X, then the equivariant genus h(X) is independent on G, i.e. h(X) = h(X). In this paper we are considering the rigidity problem for complex manifolds. In particular, we are proving that a genus ...

Arthrobacter are very common in many soils and are readily isolated in laboratory media and so they have been isolated extensively from soils. There are many species known and this chapter offers a detailed description of the Arthrobacter genus. This entry describes Arthrobacter species with an emphasis on the ability of many of the strains to transform anthropogenic chemicals into less toxic p...

We introduce the equivariant elliptic genus for open varieties and prove an equivariant version of the change of variable formula for blow-ups along complete intersections. In addition, we prove the equivariant elliptic genus analogue of the McKay correspondence for the ALE spaces.

Members of the genus Erwinia are primarily plant-pathogenic and plant-associated bacteria. As modern approaches have focused on the direct analysis of genes and their gene products, commonly associated phenotypes such as the type of disease that they cause and the relatedness of rDNA have prompted splitting of certain Erwinia members into the genus Enterobacter, Pectobacterium, Pantoea or Brenn...