نتایج جستجو برای: north america
تعداد نتایج: 204567 فیلتر نتایج به سال:
The use of fluoroquinolones for the treatment of community-acquired respiratory tract infection is increasing. Since for Streptococcus pneumoniae a ratio of the 24-h area under the concentration-time curve (AUC(24)) for the agent to the MIC (AUC(24)/MIC) greater than 30 for the fraction of unbound drug (f(u)) is the major pharmacokinetic-pharmacodynamic (PK-PD) parameter correlating with bacter...
The carnivorous plant family Sarraceniaceae comprises three genera of wetland-inhabiting pitcher plants: Darlingtonia in the northwestern United States, Sarracenia in eastern North America, and Heliamphora in northern South America. Hypotheses concerning the biogeographic history leading to this unusual disjunct distribution are controversial, in part because genus- and species-level phylogenie...
Fungi in the basidiomycete species complex Heterobasidion annosum are significant root-rot pathogens of conifers throughout the northern hemisphere. We utilize a multilocus phylogenetic approach to examine hypotheses regarding the evolution and divergence of two Heterobasidion taxa associated with pines: the Eurasian H. annosum sensu stricto and the North American H. annosum P intersterility gr...
1 Center for Global Health and Diseases, School of Medicine, Case Western Reserve University, Cleveland, Ohio, United States of America, 2 Schistosomiasis Consortium for Operational Research and Evaluation, University of Georgia, Athens, Georgia, United States of America, 3 Gillings School for Global Public Health, University of North Carolina, Chapel Hill, North Carolina, United States of America
1 Center for Bioethics, Health and Society, Wake Forest University, Winston-Salem, North Carolina, United States of America, 2 Department of Philosophy, Wake Forest University, Winston-Salem, North Carolina, United States of America, 3 History of Medicine, History and Cultural Studies, I.M. Sechenov First Moscow State Medical University, Moscow, Russia, 4 Baker Institute for Public Policy, Rice...
BACKGROUND High early mortality in patients with HIV-1 starting antiretroviral therapy (ART) in sub-Saharan Africa, compared to Europe and North America, is well documented. Longer-term comparisons between settings have been limited by poor ascertainment of mortality in high burden African settings. This study aimed to compare mortality up to four years on ART between South Africa, Europe, and ...
Species introduced to novel regions often leave behind many parasite species. Signatures of parasite release could thus be used to resolve cryptogenic (uncertain) origins such as that of Littorina littorea, a European marine snail whose history in North America has been debated for over 100 years. Through extensive field and literature surveys, we examined species richness of parasitic trematod...
SYNOPSIS TheNorth American Triassic dinosaur record has been repeatedly cited as oneof themost complete early dinosaur assemblages. The discovery of Silesaurus from Poland and the recognition that Herrerasaurus and Eoraptor may not be theropods have forced a re-evaluation of saurischian and theropod synapomorphies. Here, we re-evaluate each purported Triassic dinosaur from North Americaonaspeci...
Pleistocene diversity was much higher than today, for example there were three distinct wolf morphotypes (dire, gray, Beringian) in North America versus one today (gray). Previous fossil evidence suggested that these three groups overlapped ecologically, but split the landscape geographically. The Natural Trap Cave (NTC) fossil site in Wyoming, USA is an ideally placed late Pleistocene site to ...
Hemlock woolly adelgid, Adelges tsugae, is an invasive pest of hemlock trees (Tsuga) in eastern North America. We used 14 microsatellites and mitochondrial COI sequences to assess its worldwide genetic structure and reconstruct its colonization history. The resulting information about its life cycle, biogeography and host specialization could help predict invasion by insect herbivores. We ident...
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