Rachel Wood does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment. Radiocarbon dating has transformed our understanding of the past 50, years. Professor Willard Libby produced the first radiocarbon dates in and was later awarded the Nobel Prize for his efforts. Radiocarbon dating works by comparing the three different isotopes of carbon. Isotopes of a particular element have the same number of protons in their nucleus, but different numbers of neutrons. This means that although they are very similar chemically, they have different masses. The total mass of the isotope is indicated by the numerical superscript.
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Carbon dating for cells? Nuclear blasts provide tracer for accurate tissue dating
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Archaeologists often tests the ratio of carbon isotopes to determine approximate dates when an organism was alive, taking advantage of the fact that 14 C decays at a measurable and steady rate. So he worked with physicists who were able to increase the sensitivity of a method known as accelerator mass spectrometry.
In , the group published its first studies using the technique. To date, researchers have used it to determine the ages of everything from classes of proteins to sharks to vintage wines—in some cases, overturning long-held assumptions. He and collaborators have used 14 C to examine the dynamics of human heart muscle cells , adipocytes , microglia , and more. While most of those cells do stay with us throughout our lifetimes, the researchers found, about one-third of hippocampal neurons belong to a subpopulation that does divide periodically, with about new neurons born in the region each day.
By contrast, they later reported, humans do birth new neurons in an area called the striatum , where new cells are rarely found in other animal brains. More recently, the group found that the rate of turnover of myelin-generating oligodendrocytes in the brain was very different in people with multiple sclerosis compared with the turnover of these cells in animal models of the disease. The researchers have also found that in the immune system, the generation of new naive T cells slows with age , and the group identified molecular pathways associated with that slowdown.
Overall, they found, the age of these proteins does align with the year a person was born.
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Mobile operator Cell C is allegedly giving Blue Label Telecoms -owned wireless application service providers Wasps preferential rates and services when they use its network, a move that has angered rival service providers. Other Wasps, he says, have to have separate accounts with each network operator to do this. The text messages in question are for application-to-person A2P services. Other Wasps have also expressed concern to TechCentral about the alleged preferential treatment of Cellfind and other Blue-Label owned bulk SMS business, Panacea Mobile, but declined to speak for the record because of their relationships with Cell C.
According to Streicher, the Electronic Communications Act requires that Wasps be charged the same wholesale rate. He says Icasa opted not to get involved with the matter, meaning each network has a monopoly on delivery to its own subscribers. Vodacom played a pivotal role in helping Blue Label achieve the scale that has since made it the biggest retailer of prepaid airtime in the country.
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Willard F. Libby
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