总机电话:010-64522026   编辑部:010-62178764   邮发代码:82-418   刊号:ISSN1671-4350   定价:16.00

点击科学

中国科技教育

2017-01/总第250期

阅读数0




2016-11-18
封面上展示的是沐浴在夕阳中的大豆植株。这些叶子通过驱散过多以热能的形式所吸收的能量保护自己免受过多阳光的伤害。当叶片突然被云朵或者其他叶片遮盖时,这种光保护作用的消耗还会持续几分钟的时间,即使这些能量其实能够被用于光合作用。通过加快从光保护中恢复的时间,研究人员成功地提高了大田作物的生产力。

Soybean plants at sunset. Leaves protect themselves against too much sunlight by dissipating excess absorbed energy as heat. When leaves are suddenly shaded by clouds or other leaves, this photo protective dissipation continues for many minutes, although the energy could be used for photosynthesis.



2016-12-02
封面图例上展示的是一个功能性T细胞(背景图部分)和一个耗竭的T细胞(前景图部分)。当T细胞遇到慢性感染病症或癌症时,就会慢慢耗竭并丧失许多核心功能。这个过程涉及到一个基本的重组细胞间调控的基因表达。因此,耗竭的T细胞可能代表一个独特的细胞谱系。

Illustration of a functional T cell (background) and an exhausted T cell (foreground). When responding to chronic infection or cancer, T cells become exhausted and lose many of their core functions. This process involves a fundamental ‘rewiring’ of the cellular regulation of gene expression. Thus, exhausted T cells likely represent a distinct cell lineage.





2016-12-16
封面上展示的是2016年2月在安哥拉发现的钻石原石,高约7厘米,重约404.2克拉。通过检测如此巨大的钻石内部得到的证据表明,这些钻石来自于地球深处对流地幔中的铁镍合金金属液体。深部地幔区域存在着金属这一事实对地球的地质演化具有广泛深远的影响。

Standing at ~7-centimeters tall, this 404.2-carat rough diamond was recovered from the Lulo mine, Angola, in February 2016. Evidence from the interior of such large gem diamonds suggests that these diamonds grow from an iron-nickel metallic liquid in Earth's deep convecting mantle. The presence of metal in regions of the deep mantle has broad implications for Earth's geologic evolution.





2016-12-23
封面上展示的是位于美国华盛顿汉福德的激光干涉引力波天文台(LIGO)探测器4千米长臂上方的恒星轨迹。2016年初,LIGO的科学家们发表声明说他们的2台探测器——另一台探测器位于路易斯安纳州利文斯顿——曾经记录到1次时空中的微小震动,这是由遥远宇宙中的黑洞碰撞所引起的。这一壮举入选了《科学》杂志2016年度重大突破,证实了爱因斯坦在1个世纪前提出的预测,并为人类探索宇宙打开了一扇新窗。

Star trails arc above a 4-kilometer-long arm of the Laser Interferometer Gravitational-Wave Observatory (LIGO) detector in Hanford, Washington. Early this year, LIGO scientists announced that their two detectors—the second is in Livingston, Louisiana—had recorded a minuscule quiver in spacetime, generated by black holes colliding in the distant universe. The feat, Science's 2016 Breakthrough of the Year, confirmed a century-old prediction by Albert Einstein and opened a new window on the universe.
陶 陶 编译)

中国科教工作者协会会员专属文章,

以下平台可使用同一账号密码登录,点击开始同步密码

确认