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Radiocarbon Dating of the Human Eye Lens Crystallines Reveal Proteins without Carbon Turnover throughout Life

机译:人眼晶状体的放射性碳定年可以揭示蛋白质而整个生命过程中都不会发生碳转换

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摘要

BackgroundLens crystallines are special proteins in the eye lens. Because the epithelial basement membrane (lens capsule) completely encloses the lens, desquamation of aging cells is impossible, and due to the complete absence of blood vessels or transport of metabolites in this area, there is no subsequent remodelling of these fibers, nor removal of degraded lens fibers. Human tissue ultimately derives its 14C content from the atmospheric carbon dioxide. The 14C content of the lens proteins thus reflects the atmospheric content of 14C when the lens crystallines were formed. Precise radiocarbon dating is made possible by comparing the 14C content of the lens crystallines to the so-called bomb pulse, i.e. a plot of the atmospheric 14C content since the Second World War, when there was a significant increase due to nuclear-bomb testing. Since the change in concentration is significant even on a yearly basis this allows very accurate dating.
机译:晶状体是晶状体中的特殊蛋白质。由于上皮基底膜(晶状体囊)完全包裹晶状体,不可能使老化细胞脱皮,并且由于该区域完全没有血管或代谢产物运输,因此这些纤维没有随后的重塑,也没有去除退化的镜片纤维。人体组织最终从大气中的二氧化碳中获取其 14 C含量。因此,晶状体蛋白中 14 C的含量反映了晶状体晶体形成时 14 C的大气含量。通过将晶状体晶体的 14 C含量与所谓的炸弹脉冲进行比较,可以进行精确的放射性碳测年,即自第二次以来的大气 14 C含量图第二次世界大战时,由于核弹试验而大大增加。由于浓度的变化甚至每年都非常显着,因此可以非常精确地进行约会。

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