Tag Archives: ‘clock’

Zircon as Earth’s Timekeeper: Are We Studying the Clock Proper?

Cathodoluminescence picture from a scanning electron microscope of a typical igneous zircon crystal from samples studied by the QUT analysis staff, revealing progress rings of the zircon. Yellow circles… [[ This is a content summary only. Visit my website for … Continue reading

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Zircon as Earth’s Timekeeper: Are We Studying the Clock Proper?

Cathodoluminescence picture from a scanning electron microscope of a typical igneous zircon crystal from samples studied by the QUT analysis staff, revealing progress rings of the zircon. Yellow circles enclose ablation websites by a laser from which isotopic knowledge is … Continue reading

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Life history effects on the molecular clock of autosomes, sex chromosomes

Accounting for the effect of sex-specific life history events, such as the onset of puberty in male hominids, on mutation rates can help reconcile mutation-rate-based estimates of the split between chimpanzees and humans with the fossil record, suggesting that the … Continue reading

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Life history effects on the molecular clock of autosomes, sex chromosomes

Accounting for the effect of sex-specific life history events, such as the onset of puberty in male hominids, on mutation rates can help reconcile mutation-rate-based estimates of the split between chimpanzees and humans with the fossil record, suggesting that the … Continue reading

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Biological ‘clock’ discovered in sea turtle shells

Radiocarbon dating of atomic bomb fallout found in sea turtle shells can be used to reliably estimate the ages, growth rates and reproductive maturity of sea turtle populations in the wild, a new study led by Duke University and NOAA … Continue reading

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