نتایج جستجو برای: all apparently began ca 5 2 ma
تعداد نتایج: 4519419 فیلتر نتایج به سال:
The deposits of Eocene Lake Gosiute that constitute the Green River Formation of Wyoming contain numerous tuff beds that represent isochronous, correlatable stratigraphic markers. Tuff beds selected for Ar/Ar analysis occur within laminated mudstone, are matrix supported, and lack evidence of reworking. These tuffs contain 2%–15% euhedral phenocrysts of quartz, plagioclase, sanidine, biotite, a...
Hydrogen peroxide (H O ) inhibits the population spike (PS) evoked by Schaffer collateral stimulation in hippocampal slices. 2 2 21 Proposed mechanisms underlying this effect include generation of hydroxyl radicals (?OH) and inhibition of presynaptic Ca entry. We have examined these possible mechanisms in rat hippocampal slices. Inhibition of the evoked PS by H O was sharply concentration2 2 de...
Phylogeography relies on examination of geographical distributions of genealogical lineages (Avise, 2000), whereas biogeography relies upon concordant geographical distributions of multiple species (Briggs, 1974; Nelson & Platnick, 1981). However, just as biogeography depends on evidence from multiple species, inference about phylogeographical patterns can be strengthened by examination of mult...
PREMISE Bromeliaceae form a large, ecologically diverse family of angiosperms native to the New World. We use a bromeliad phylogeny based on eight plastid regions to analyze relationships within the family, test a new, eight-subfamily classification, infer the chronology of bromeliad evolution and invasion of different regions, and provide the basis for future analyses of trait evolution and ra...
The deposits of Eocene Lake Gosiute that constitute the Green River Formation of Wyoming contain numerous tuff beds that represent isochronous, correlatable stratigraphic markers. Tuff beds selected for 40Ar/39Ar analysis occur within laminated mudstone, are matrix supported, and lack evidence of reworking. These tuffs contain 2%–15% euhedral phenocrysts of quartz, plagioclase, sanidine, biotit...
Based on the first implementation of mixing antibiotics into bone cement in the 1970s, the Endo-Klinik has used one stage exchange for prosthetic joint infection (PJI) in over 85% of cases. Looking carefully at current literature and guidelines for PJI treatment, there is no clear evidence that a two stage procedure has a higher success rate than a one-stage approach. A cemented one-stage excha...
1 Control & Dynamical Systems, Department of Computing and Mathematical Sciences, California Institute of Technology, Pasadena, CA 91125; 2 Institute for Medical Engineering & Science, Department of Biological Engineering, and Synthetic Biology Center, Massachusetts Institute of Technology, Cambridge, MA 02139; 3 Division of Biology and Biological Engineering, California Institute of Technology...
1. Department of Biology, MIT, Cambridge MA 2. Program in Computational and Systems Biology, MIT, Cambridge MA 3. Department of Cellular and Molecular Medicine, University of California at San Diego, La Jolla, CA 4. Institute for Genomic Medicine, University of California at San Diego, La Jolla, CA 5. Bioinformatics and Systems Biology Graduate Program, University of California San Diego, La Jo...
Devonian granitoid plutons comprise a major part of the bedrock northwestern Maine representing magmatic expression Acadian orogeny in this northern Appalachian orogen. They are petrographically diverse with minerals characteristic both I- and S-type granites, some cases within same intrusion, compositionally zoned. New LA-ICP-MS ages presented here elucidate timing duration magmatism. The earl...
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