对于生命来说，繁衍生息至关重要。在动物中，胎盘作为胚胎与母体连接的纽带，承担着向胚胎输送营养和屏蔽有害物质的功能。植物胚胎发育与动物有很多类似的方面，包括植物种子需要累积大量的营养物质，然而植物种子过去并未鉴定到类似胎盘的组织。种皮包裹着整个种子，长 ...

In about 10 years, St. Augustine's Viv Helwig has guided Vested Metals from a small startup to one of the f astest-growing companies on the First Coast. In the last year, the company set itself up for ...

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A robot that has spent months inside the ruins of a nuclear reactor at the tsunami-hit Fukushima Daiichi plant delivered a tiny sample of melted nuclear fuel on Thursday, in what plant officials said ...