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自然要览
来源:中国科学报      作者:田学文      时间:2014-12-30 18:12      关键词:自然要览

自然要览
英国Nature 杂志 2014 年12 月18 日出版

形成碳—碳键的一条简单路径

这篇论文报告了一个新型碳—碳键形成反应的研究成功,该反应使得人们能够简单地生成以前要么不可能获得、要么难以获得的分子。该反应利用一种简单的铁催化剂和一种廉价的硅烷通过异原子取代的烯烃与缺电子烯烃之间的相互作用来形成高度取代的碳—碳键。作者介绍了超过60个这一反应的例子,覆盖一系列不同的基质。这一反应对于包括聚合物、染料和药物及半导体在内的有机化合物的设计有参考意义。

无国界生物多样性保护

保护区的设立旨在减轻人为因素如生境丧失对生物多样性造成的压力。为此,一个国际认同的目标是,到2020年,将保护区网络扩大到覆盖世界陆地面积的17%。但生物多样性在不同国家和不同生境之间是不均匀分布的,这便提出了应当对哪些区域予以保护、以产生最大效果的问题。Federico Montesino Pouzols等人发现,通过国际协调行动将保护区网络扩大到17%这个目标,可能会使受到保护的物种分布范围和生态区平均增大三倍。然而,在某个国家内所进行的优化效率就要低很多。而且,如果将所预测的2040年以前的土地利用变化和由此造成的生境丧失考虑进去,要维持当前的保护水平将是不可行的,超过1000个濒危物种的分布范围将会减小50%以上。因此,作者提出,要实现有效的生物多样性保护,土地利用政策和保护区决策必须在国际层面上予以协调。

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