长寿：当人类不再衰老

• fsquared

  2022-07-13
  如果说旧习难改，那么自由基学说就是海洛因。十多年前，这一理论被我所在领域的科学家们推翻了，然而，药物和饮料的供应商仍然广泛地沿用这一理论，因为其背后是全球30亿美元的产业。因为有这些广告宣传，所以60%以上的美国消费者仍在寻找富含抗氧化剂的食品和饮料就不奇怪了。
• ZZ

  2019-12-01
  At the nanoscale, it is merely an ordered set of chemical reactions, concentrating and assembling atoms that would normally never assemble, or breaking apart molecules that would normally never disintegrate. Life does this using proteinaceous Pac-Men called enzymes made up of coils and layered mats of amino acid chains. Enzymes make life possible by taking advantage of fortuitous molecular movements. Every second you are alive, thousands of glucose molecules are captured within each of your trillion of cells by an enzyme called glucokinase, which fuse glucose molecules to phosphorus atoms, tagging them for energy production. Most of the energy created is used by a multicomponent RNA and protein complex called a ribosome, whose primary job is to capture amino acids and fuse them with other...