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jandan.net
11h
冥王星是如何失去行星地位的
2006年,国际天文学联合会 (IAU)将冥王星从行星降级为矮行星,这一决定让许多人惊讶,甚至包括一些科学家。即便多年过去,一些天文学家仍希望重新定义行星,以明确行星与其他天体的区别。
jandan.net
11h
史无前例:干细胞移植恢复多名患者视力
此前,研究人员曾利用患者自身皮肤的iPSCs恢复中心视网膜黄斑退化患者的视力,但这是首次在此类视力损伤中实现类似成果,且未使用患者自身细胞。虽然这些试验令人振奋,但此类手术仍高度实验性,且潜在风险较大。还需要大量研究来验证其安全性和有效性。
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