نتایج جستجو برای: chronometer
تعداد نتایج: 254 فیلتر نتایج به سال:
Phylogenetic relationship of 22 FLPs was revealed on the basis of polymorphism in three genes namely 16S rDNA, Pseudomonas-specific and rpoD gene regions. The primers for 16S rDNA, Pseudomonas-specific region and rpoD gene region were amplifying a region of 1492, 990 and 760 bp, respectively, from all the isolates investigated. The RFLP analysis of the PCR products resulted in a classification ...
OBJECTIVES To compare the fatigue life of Tango-Endo, WaveOne GOLD, and Reciproc NiTi instruments under static model via artificial canals with different angles of curvature. MATERIALS AND METHODS Reciproc R25, WaveOne GOLD Primary, and Tango-Endo instruments were included in this study (n = 20). All the instruments were rotated in artificial canals which were made of stainless steel with an ...
Coral microatolls from the coast and outer-arc islands of Western Sumatra retain a stratigraphic and morphologic record of relative sea-level change, which is due in large part to vertical tectonic deformation above the Sumatran subduction zone. Low water levels, whose fluctuations produce measurable changes in coral morphology, limit the upward growth of the microatolls. Annual rings, derived ...
Beat-to-beat changes in the heart period are transformed into a network of increments between subsequent RR-intervals, which enables graphical descriptions of short-term heart period variability. Three types of such descriptions are considered: (1) network graphs arising from a set of vertices and directed edges, (2) contour plots of adjacency matrices A, representing the networks and transitio...
PURPOSE This study compared the cutting area, instrumentation time, root canal anatomy preservation and non-instrumented areas obtained by F360(®), Mtwo(®), RaCe(®) and Hyflex(®) files with ISO size 35. MATERIAL AND METHODS 120 teeth with a single straight root and root canal were divided into 4 groups. Working length was calculated by using X-rays. The teeth were sectioned with a handpiece a...
Introduction: The now extinct radionuclide Pd decays to Ag with a half life of 6.5Myr. Highly volatile element depleted (i.e. high Pd/Ag) Group IVA iron meteorites show good correlations between excess Ag and Pd/Ag. This strongly indicates the presence of live Pd at the start of the solar system [1]. Pd is both more refractory and more siderophile than Ag. Hence condensation/evaporation process...
Abstract. Mapping the biogeochemical characteristics of surficial ocean sediments is crucial for advancing our understanding global element cycling, as well assessment potential footprint environmental change. Despite their importance long-term repositories biogenic materials produced in and delivered from continents, signatures remain poorly delineated. Here, we introduce MOSAIC (Modern Ocean ...
Abstract Quantifying the rhythms and rates of magmatic-hydrothermal systems is critical for a better understanding their controls on ore formation dynamics magmatic reservoirs that feed them. We reconstructed evolution ore-forming fluids using hydrothermal quartz from 17.4 Ma Zhibula skarn, Tibet. Ion probe analysis reveals sharp dramatic changes in ?18O values between 5‰ ?9.3‰, with fluid vary...
Abstract We review geochronological data relating to the timing and rate of Laurentide Ice Sheet recession in northeastern United States model ice margin movements a Bayesian framework using compilations previously published organic 14 C ( n = 133) situ cosmogenic 10 Be 95) ages. compare resulting method‐specific chronologies with glacial varve records that serve as independent constraints on p...
Introduction: Among the calcium-aluminum-rich inclusions (CAIs) there exists a small subgroup referred to as FUN CAIs (for Fractionation and Unidentified Nuclear effects [1]) that exhibit unusually large mass-dependent fractionations and mass-independent isotopic variations [1-3]. Understanding the origin, conditions of formation, genetic relationship of these inclusions with other CAIs and the...
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