We introduce a stochastic model in which adjacent planar regions A, B merge stochastically at some rate λ(A, B) and observe analogies with the well-studied topics of mean-field coagulation and of bond percolation. Do infinite regions appear in finite time? We give a simple condition on λ

Taxonomy of Rubus ser. Discolores in the Czech Republic

Summary. The genetic organization of une-26(IV) and adjacent regions was studied in Caenorhabditis elegans. We constructed a fine structure genetic map of unc-26(IV), a gene that affects locomotion and pharyngeal muscle movement but not muscle structure. Eleven alleles were positioned relative

SUMMARY: Extensive recent collections and taxonomical revisions provide a basis for the first zoogeographical analysis of Magellan Nudibranchia. Using 36 of 57 nominal species described in this area, the degree of endemism has been decreased from 70 % to 31%. Very close faunistic relationships to northern Argentina are evident as five of six known species (83%) are shared with the Magellan Province. With a 43 % overlap of Magellan species in the southern part of the Peruvian faunal Province (44 species), this area shows a transitional character between cold- and warm-temperate waters. Only three of 36 Magellan species are found in common with the high Antarctic (ca. 30 species), revealing a low faunal sim-ilarity of about 10%. High Antarctic waters are characterized by high nudibranch endemism (about 80%). Of the ten nudi-branch species reported from South Georgia, two are exclusively shared with Magellan, two with high Antarctic and three with both Magellan and Antarctic waters, indicating transitional, Subantarctic conditions. One species is endemic to South Georgia, two other species are insufficiently known and may or may not be endemic. Generally, the Antarctic Convergence appears to be a distributional barrier for Magellan nudibranchs. In contrast, some Antarctic nudibranch species extend far into the Atlantic, obviously with cold Antarctic deep water currents. Coastal, cold temperate Magellan nudibranchs have rel-atively low affinities to the deep water fauna off Argentina, which seems to be predominantly submerged Antarctic species, but this bathymetrical zonation needs to be further investigated.

• Strain in the lower crust is diffuse, while upper crustal strain is localized • The Red Sea rift axis likely migrated eastward gradually since the late Miocene • The lower crust beneath the Red Sea

A key to the species and varieties of Flammulaster growing in the Netherlands and adjacent regions is given; each taxon is provided with a description and line drawings. Flammulaster limulatus var. litus is described as new. The following new combinations are made: F. carpophilus var. rhombosporus

in the network with overlapping regions of coverage transmit periodic beacon signals. Nodes use a simple connectivity metric, that is more robust to environmental vagaries, to infer proximity to a given subset of these reference points. Nodes localize themselves to the centroid of their proximate reference

www.stat.berkeley.edu/users/aldous Abstract. We introduce a stochastic model in which adjacent planar regions A,B merge stochastically at some rate λ(A,B), and observe analogies with the well-studied topics of mean-field coagulation and of bond percolation. Do infinite regions appear in finite time

and distinctive clade of western North American species that appears to be most closely related to the white oak group. Within the white oaks and red oaks (black oaks), the majority of California species do not have obvious, close relationships to species outside of the region. In addition, these species either

Using a wave telescope method based on a spherical waves representation we are able to determine the location of plasma wave sources from Cluster mag-netic field data. In virtue of Huygens principle, our method also allows to determine the shape of the source region. We apply the method to a