点击科学
2024-10-11
科学家认为，在现阶段想要制造完美的原子级薄碳片（称为石墨烯）仍然很棘手（图中左侧）。相反，试图将这种材料商业化的公司通常会使用成堆的石墨烯纳米片（封面图中间部分）及氧化石墨烯层（图中右侧）。这些更为廉价的石墨烯形式可能含有缺陷，但也许其优势在于可以作为一种坚固且电敏感的材料。
It is still tricky to makethe perfect， atom-thin sheetsof carbon known as graphene（ l e f t ） . Instead ，companiestrying to commercialize the material often use stacks of graphene nanoplatelets （middle）and layers of graphene oxides（right）. These cheaper forms of graphene can contain defects butapproximate its superpowers asa strong and electrically sensitivematerial.
2024-10-25
2020年发生在美国加州的LNU 闪电综合火灾是美国发展最快的火灾之一。大火在1 天之内蔓延了39000多公顷土地，扑灭工作极为艰难，造成5 人死亡、1400多所房屋被烧毁。快速火灾是最具破坏性的类型，占建筑物受损或毁坏的89%。对于疏散和保护房屋而言，速度比火灾规模更为紧要。
The LNU Lightning Complex fire in California wasamong the fastest-growing firesin the US in 2020. It grew morethan 39 000 ha in a single day，overwhelming suppression efforts，taking five lives， and burningmore than 1 400 homes. Fastfires， the most destructive type，account for 89% of structuresdamaged or destroyed. Speedmatters more than fire size forevacuation and home protection.
2024-11-01
封面图展示的是植物细胞在经历不完全分裂并保持连接的情景。如图所示，2个子细胞通过横跨胞间连丝（用于细胞间通讯的微小桥梁）的内质网连接在一起。新发现表明，内质网在细胞分裂过程中可以使这些桥梁保持持续打开；如果没有它，胞间连丝就会关闭，这解决了一个长期存在的问题，即如何将细胞分裂与通讯结合起来。
Plant cells undergo incomplete division and remainconnected. This image illustrates two daughter cells linked bystrands of endoplasmic reticulum spanning plasmodesmata -tiny bridges for intercellular communication. New findings reveal that the endoplasmic reticulum holds these bridges openduring cell division; without it，plasmodesmata close， addressinga long-standing question abouthow to combine cell division andcommunication.
2024-11-08
封面上展示的是生活在美国阿拉斯加卡特迈国家公园和保护区的一只棕熊，正在河边表演“湿狗抖动”——这是大多数哺乳动物在弄湿身体后或背部受到刺激时都会出现的典型行为。研究人员现在已经确定了一种与下层绒毛相关的轻触敏感机械感受器，它可以介导小鼠的这种行为。
A brown bear at KatmaiNational Park and Preserve inAlaska is performing a “wetdog shake” by the riverside -a stereotypical behavior observedin most mammals when theyget wet or encounter an irritanton their back. Researchers havenow identified a type of lighttouch-sensitive mechanoreceptorassociated with underfur thatmediates this behavior in mice.
（陶陶 编译）