Field research into the climatic history and shifting of the East Saharan desert has furnished evidence that during Quaternary time the present extremely arid western part of Upper Nubia (northern Sudan)was temporarily linked to the Nile by way of a hitherto unknown 400 kilometer long tributary. From about 9500 to 4500 years ago, lower Wadi Howar flowed through an environment characterized by n...

Wind channeling by small wadis of few kilometers width at the Dead-Sea area is demonstrated with highresolution modeling. Previous works have not shown such channeling in very small rivers due to computation difficulties on the mesoand the lack of suitable observations for verification. The wind channeling is demonstrated in three wadis, and was verified by meteorological model simulations on t...

The genus Verbena L. (Verbenaceae) comprises 250 species mainly in tropical and temperate America. It is represented in Egypt by two species viz. Verbena ozcinalis L. and V. supina L. (Taeckholm, 1974). Verbena ozcinalis is widely distributed mainly in the northern hemisphere while V. supina is of Mediterranean, West Irano}Turanian and East Saharo-Arabian distribution (Fienbrun-Dothan, 1978). I...

The reproductive biology of Poecilia latipinna inhabiting Wadi Haneefah stream, Riyadh, Saudi Arabia was studied. The fish (P. latipinna) were found reproductively active round the year. The highest reproductive activity occurred from February to May and August to November which defined two distinct annual periods of reproduction. There was a monthly variation in sex ratio. More females than ma...

Strain ALEN 2(T) was isolated from a mixed culture capable of complete autotrophic denitrification with thiosulfate as electron donor at pH 10; the mixed culture was enriched from sediment from Lake Fazda (Wadi Natrun, Egypt), a hypersaline alkaline lake. The isolate had large, non-motile, coccoid or barrel-shaped cells with intracellular sulfur globules. The bacterium was obligately chemolitho...

In the region of the Lower Jordan River a steadily increasing population has access only to constantly decreasing natural freshwater resources. Integrated Water Resources Management (IWRM) considers social, economical and ecological objectives when deciding over long-term strategies in a study area. IWRM is collaborative and knowledge intensive, but missing operational guidelines and data manag...

features [ ] and [a] in place of the rural features [q] and [e] respectively in the vernacular Arabic of rural, non-migrant children and adolescents in the village of Oyoun Al-Wadi in Syria. The study shows that linguistic change in this village is moving in two opposing directions. Girls continue to use their initially acquired mothers’ urban features in their adolescent years; boys who initia...