Gene flow among Tetranychus urticae (Acari: Tetranychidae) populations in Greece

Polymorphism of four enzymatic loci has been examined in 27 populations of Tetranychus urticae in relation to their geographical distribution and to two ecological parameters: open field vs. greenhouse habitats, and species of the colonized host plant. Genetic differentiation was significantly correlated to geographical distance in both types of habitat. Mite density and distribution of infested plants appear to be important factors for the population structure of T. urticae . In open field, T. urticae specimens from citrus trees were genetically more similar to other 'citrus' samples collected in different localities than they were from mites collected in the same locality on other plant species.     

Notes from the Balkans: Locating Marginality and Ambiguity on the Greek-Albanian Border

Notes from the Balkans: Locating Marginality and Ambiguity on the Greek-Albanian Border. Sarah F. Green. Princeton: Princeton University Press, 2005. 320 pp.     

Specificity of Chromatin-associated Barley Nucleases towards a Synthetic Deoxynucleotide

The specificity of chromatin-associated nucleases A₁, A₂ andB of germinating barley towards the synthetic undecadeoxyribonucleotided-pGpApTpCpTpCpCpCpGpGpG was tested. Although no enzyme showedabsolute specificity towards one type of bond, all recognizedthe positions of certain bonds within the substrate and preferredcentrally-located bonds. The specificity towards the deoxy-substrateis compared to the specificity towards homopolyribonucleotides. Key words: Barley, nuclease, deoxyribonucleotides