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

陶 陶 编译

2018-05/总第266期

阅读数1

6383.jpg

2018-03-30

多阵列的多金属合金纳米颗粒(较大的彩色球体)可以通过高温震击碳纳米纤维上的金属盐(较小的球体代表单个金属原子)获取。这种方法能够使多达8种不同的金属均匀混合形成单相固溶体,同时可以为纳米冶金研究提供一个可行性平台,并且具有广泛的应用前景。

A diverse array of multimetallic alloy nanoparticles (large multicolored spheres) can be achieved via high-temperature shocking of metal salts on carbon nanofibers (small spheres represent individual metal atoms). This method enables homogeneous mixing of up to eight different metals to form single-phase solid solutions and presents a viable platform for nanometallurgical studies with a wide range of applications.


6384.jpg

2018-04-06

封面上展示的是一种普兹瓦尔斯基野马,这匹母马和马驹来自俄罗斯奥伦堡保护区(这是在奥伦堡保护区建立一个半散养普氏野马计划的一部分),普氏野马是一种独特的并且濒临灭绝的血统,以前曾被认为是纯粹的野生物种。如今,通过考古及古代的基因组证据表明,哈萨克斯坦的波泰人文化中发现的最早的驯养马(5 500年前),很可能是普氏野马的直系祖先,而不是现代的家养牲畜。

Przewalski's horses, represented by this mare and foal from Orenburg Reserve, Russia (part of the Program of Establishing a Semi-Free Population of the Przewalski's Horse in the Orenburg Reserve), are a distinct and endangered lineage previously thought to have purely wild origins. Archaeological and ancient genomic evidence now reveals that the earliest domesticated horses found in the Botai culture, Kazakhstan (5 500 years ago), are likely the direct ancestors of Przewalski's horses rather than modern domestic stock.


6385.jpg

2018-04-13

封面图展示的是一棵白杨树。在冬季的低温环境下,类似于白杨这样的树木会通过在顶芽中建立休眠状态保护它们的分生组织和叶原基。白昼的缩短,预示着冬日的来临,就会导致休眠。科学家们发现树木休眠光周期控制的分子机制,会使植物激素疏导胞间连丝的堵塞,也就是连接相邻细胞的通道。

Trees such as this aspen (Populus tremuloides) protect their meristem and leaf primordia from low temperatures during winter by establishing dormancy in apical buds. Reduction in day length, heralding the advent of winter, induces dormancy. The molecular mechanism underlying photoperiodic control of tree dormancy has been revealed to involve plant hormone?mediated blockage of plasmodesmata, channels that connect neighboring cells.


6386.jpg

2018-04-20

封面图展示的是通过计算分离的细胞及其内部细胞器的三维显微图,图像是在一部记录斑马鱼眼睛拓展的电影画面中捕捉到的。通过将微创性点阵光片显微技术与自适应光学仪器相结合,用来应对细胞标本中的光学像差,就能够在生物体中以高解析度进行快速的亚细胞过程研究,在这个过程中存在着所有调节细胞生理学的环境因素。

A three-dimensional micrograph of computationally separated cells with their internal organelles, as captured by a movie of the developing zebrafish eye. Combining minimally invasive lattice light-sheet microscopy with adaptive optics to counter optical aberrations present in multicellular specimens enables the study of rapid subcellular processes at high resolution within living organisms, where all environmental factors that regulate cellular physiology are present.


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