نتایج جستجو برای: central eurasia biquarterly
تعداد نتایج: 472643 فیلتر نتایج به سال:
It has become important to answer the questions of what energy related infrastructure, such as transcontinental natural gas pipelines and international electricity grids, should be constructed in Asia/Eurasia, and how energy demand should be satisfied there securely, economically, and environmentally benignly over the next several decades. The purpose of this study is to investigate the possibl...
Low pathogenic avian influenza A viruses (IAVs) have a natural host reservoir in wild waterbirds and the potential to spread to other host species. Here, we investigated the evolutionary, spatial and temporal dynamics of avian IAVs in Eurasian wild birds. We used whole-genome sequences collected as part of an intensive long-term Eurasian wild bird surveillance study, and combined this genetic d...
A maximum parsimony tree of 21 complete mitochondrial DNA (mtDNA) sequences belonging to haplogroup X and the survey of the haplogroup-associated polymorphisms in 13,589 mtDNAs from Eurasia and Africa revealed that haplogroup X is subdivided into two major branches, here defined as "X1" and "X2." The first is restricted to the populations of North and East Africa and the Near East, whereas X2 e...
We present the first speleothem-derived central North Africa rainfall record for the last glacial period. The record reveals three main wet periods at 65-61 ka, 52.5-50.5 ka and 37.5-33 ka that lead obliquity maxima and precession minima. We find additional minor wet episodes that are synchronous with Greenland interstadials. Our results demonstrate that sub-tropical hydrology is forced by both...
The early Pleistocene colonization of temperate Eurasia by Homo erectus was not only a significant biogeographic event but also a major evolutionary threshold. Dmanisi's rich collection of hominin fossils, revealing a population that was small-brained with both primitive and derived skeletal traits, has been dated to the earliest Upper Matuyama chron (ca. 1.77 Ma). Here we present archaeologica...
Central Asia has become an important arena of collaboration for Russia and China, with Moscow focusing on the region's security stability Beijing promoting trade commerce, particularly investment in infrastructure. As Mher D Sahakyan, Founder Director China-Eurasia Council Political Strategic Research Yerevan, Armenia, writes, Chinese Russian interests overlap as both see value regional integra...
Africa is commonly marginalized in global social studies, whether of present or past. This essay makes the case for the substantial importance of Africa through a systematic comparison with Eurasia. It documents the large area and the relatively dense population of Africa, in past and present, as compared with Eurasia and also with the Americas. The essay gives particular attention both to sub-...
Circaea (Onagraceae) consists of eight species and six subspecies distributed in Eurasia and North America. The sister group of Circaea was recently shown to be Fuchsia, which comprises 107 species primarily distributed in montane Central and South America, including four species occurring in the South Pacific islands. Three plastid markers (petB-petD, rpl16, and trnL-F) and nrITS sequences fro...
African swine fever (ASF) is a complex infectious disease of swine that constitutes devastating impacts on animal health and the world economy. Here, we investigated the evolutionary epidemiology of ASF virus (ASFV) in Eurasia and Africa using the concatenated gene sequences of the viral protein 72 and the central variable region of isolates collected between 1960 and 2015. We used Bayesian phy...
Understanding links between the El Niño–Southern Oscillation (ENSO) and snow would be useful for seasonal forecasting, as well as for understanding natural variability and interpreting climate change predictions. Here, a 545-yr run of the third climate configuration of the Met Office Unified Model (HadCM3), with prescribed external forcings and fixed greenhouse gas concentrations, is used to ex...
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