Calibrating the clock
نویسندگان
چکیده
منابع مشابه
Calibrating the mitochondrial clock.
Some of the DNA from the tsar's mitochondria--cellular organelles with their own DNA--didn't quite match that of his living relatives. Forensic experts thought that most people carry only one type of mitochondrial DNA(mtDNA), but the tsar had two: The same site sometimes contained a cytosine and sometimes a thymine. His relatives had only thymine, a mismatch that fueled controversy over the aut...
متن کاملCalibrating the avian molecular clock.
Molecular clocks are widely used to date phylogenetic events, yet evidence supporting the rate constancy of molecular clocks through time and across taxonomic lineages is weak. Here, we present 90 candidate avian clock calibrations obtained from fossils and biogeographical events. Cross-validation techniques were used to identify and discard 16 inconsistent calibration points. Molecular evoluti...
متن کاملCalibrating the telomere clock in common terns, Sterna hirundo.
Field biologists often work with animals for which there are no prior history. A marker of an animal's age would offer insight into how age and experience affect reproductive success and other life history parameters. We previously reported that length of telomere restriction fragments shorten predictably with age in the captive zebra finch (Taeniopygia guttata). This paper reports that telomer...
متن کاملExploring EPC Gen-2 clock generation with self-calibrating oscillator
This works presents a study that aims the development of a power efficient clock generator to fulfill EPCglobal class 1 generation 2 RFID standard specification. Firstly, clock frequency requirements were investigated. Then, the standard characteristics were explored in order to define a self-calibration methodology. The circuit designed was simulated at electric device level in a 0.18 micromet...
متن کاملCalibrating the molecular clock: estimates of ground squirrel divergence made using fossil and geological time markers.
According to 5-Myr-old fossil evidence, ground squirrels within the genus Spermophilus had diverged into subgenera Spermophilus and Otospermophilus by late Miocene times. Radiometric dating has also provided a precise time for the sudden onset of a geological event, occurring 0.725 Myr ago, that initiated the complete and permanent reproductive isolation of two subspecies within the subgenus Ot...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature Reviews Molecular Cell Biology
سال: 2009
ISSN: 1471-0072,1471-0080
DOI: 10.1038/nrm2806