Molecular Clocks
Where Do I Come From? Using Student’s Mitochondrial DNA to Teach About Phylogeny, Molecular Clocks, and Population Genetics
... Fourth Lab: Population Genetics, Molecular Clocks, and Speciation Time. Estimated Time, Two to Three Hours For the final lab, students used the free software DNAsp (Librado and Rozas 2009) to analyze a ...
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Molecular Clocks and the Puzzle of RNA Virus Origins
... The recent origin of RNA viruses depicted by molecular clocks is therefore not as constraining as it seems. However, one major problem remains; how can we explain the match between virus and host ...
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Land bridge calibration of molecular clocks and the post glacial colonization of Scandinavia by the Eurasian field vole microtus agrestis
... interprets molecular genetic variation in a spatial and temporal context. Molecular clocks are frequently used to calibrate phylogeographic analyses, however there is mounting evidence that ...
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Disruption of rhythms of molecular clocks in primary synovial fibroblasts of patients with osteoarthritis and rheumatoid arthritis, role of IL 1β/TNF
... on molecular clocks studied mRNA and because protein determination with Western blot was extremely time-consuming (preliminary studies), we used quantitative PCR to detect levels of molecular clock ...
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Systematic biology of gymnotiform and mormyriform electric fishes: phylogenetic relationships, molecular clocks and rates of evolution in the mitochondrial rRNA genes
... (the molecular clock) should not be expected if organisms with different thermal habits, efficiency of DNA repair mechanisms and nucleotide generation times (body size + metabolic rate + generation time) are ...
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Calibration of Multiple Poliovirus Molecular Clocks Covering an Extended Evolutionary Range
... of molecular clock calibrations is a function of the evolution rate, the time interval for sampling, the sequence length (21), and the availability of biological material with a well-defined evolutionary ...
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Chronodentistry: the role & potential of molecular clocks in oral medicine
... circadian clocks in different organs ...dian clocks has been shown in almost all human organs, including the cardiovascular system [5], the respiratory system [6], the musculoskeletal system [7, 8], skin ...
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A method for calibrating molecular clocks and its application to animal mitochondrial DNA.
... years in length was taken to be Poisson-distributed with expectation 0.25T (a rate of evolution similar to that found in many of the actual data analyses). For the “variable-[r] ...
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Bayesian random local clocks, or one rate to rule them all
... local molecular clocks while simultaneously estimating the ...strict molecular clock against a large array of alternative local molecular clock ...local molecular clocks to ...
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Inferring clocks when lacking rocks: the variable rates of molecular evolution in bacteria
... result, molecular clocks have been widely applied to estimate divergence times in bacteria [1,2,5,6], as well as in other organisms ...the molecular clocks. Fur- thermore, calibrating ...
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DNA methylation aging clocks: challenges and recommendations
... and molecular hallmarks of aging include changes associated with cell senescence, dysregulated nutri- ent sensing, and stem cell exhaustion, among others ...methylation clocks” [21–25]. Subse- quently, ...
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Regulation of Sleep and Circadian Rhythms by Metabolic Neuropeptides
... LNv molecular clock, we evaluated a well-established circadian output regulated by the central clock, namely free-running rhythms in rest:activity under constant ...the molecular clock and downstream ...
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Temporal binding and internal clocks: No evidence for general pacemaker slowing.
... multiple clocks operating in parallel, rather than a single clock system: One clock might time the interval and another the embedded event (see Eagleman, 2008; Klapproth, 2011; we return to this point in the ...
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Biological clocks: their relevance to immune-allergic diseases
... core molecular clock consists of two feedback loops [12] connected by a central pair of tran- scription factors which regulate reciprocally to induce the rhythm of gene ...
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Complex cyanides as chemical clocks in hot cores
... gas abundances in our model are the result of subtracting the atoms that have gone into molecules from the typical gas abun- dances found in the pristine model input. Our approach differs from Garrod et al. (2008) in ...
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Real Representations of Ancient Greek Technology
... the clocks of the ancient Greeks, the automatics of Heron, the automatics of Philon of Byzantium, the mythical automatics of the ancient Greeks, the inventions of Ktesibios, the inventions of Archimedes, the ...
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Biological clocks and physical functioning in monozygotic female twins
... and Molecular Biological Study on Estrogen-related Pathways” (SAWEs, n = 15 pairs) and the Finnish Twin Study on Aging (FITSA, n = 9 ...biological clocks, body composition or physical functioning ...
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Clocks, Watches and Timepieces: The Ace Bio Political Tools
... was also reflected the way their time were venerated and called “canonical hours” (Zerubavel, 1980: p. 158), signalling the daily routine of the mon- astery. These celebrations were also used for the purpose of ...
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Lasers, Cold Atoms and Atomic Clocks: Realizing the Second Today
... Further improving the definition of the second could be obtained still keeping atomic clocks, but changing the atomic reference transition. The basic principle is always to increase the quality factor of the ...
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The three-dimensional probability csma based on double clocks mechanism
... The introduction of double clocks is to lower the system idle time. In the Fig. (6), we know the system idle time under the new protocol is lower than the traditional three-dimensional probability CSMA protocol. ...
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