點擊科學

2017-05-26

封面上展示的是木星的南極，圖像由“朱諾”號宇宙飛船在52000千米髙空拍攝。圖中橢圓形部分是旋風，直徑髙達1000千米。通過使用JunoCam攝像儀器在3個獨立的軌道上拍攝的多幅圖像結合在一起，就可以顯示出所有區(qū)域的日光、增強色彩及立體投影景象。

Jupiter's south pole， as seen by the Juno spacecraft from an altitude of 52 000 kilometers. The oval features are cyclones， up to 1 000 kilometers in diameter. Multiple images taken with the JunoCam instrument on three separate orbits were combined to show all areas in daylight， enhanced color， and stereographic projection.2017-06-02

封面上展示的是處于三聚體濾過性毒菌表面狀態(tài)（圖中橙色部分）的拉沙病毒糖蛋白，病毒與一個來自于人類幸存者的中和抗體片段（圖中白色部分）相結合。如圖所示，第2個空抗體結合位點高亮顯示。聯(lián)胞抗體將三聚體中不同的單體橋接在一起，以防止感染所需的構象變化。由Hastie等人確定的晶體結構為疫苗的研制開發(fā)提供了一個模板。

The Lassa virus glycoprotein in its trimeric，viral surface state （orange） bound to a fragment of a neutralizing antibody from a human survivor （white）. A second， empty antibody binding site is illuminated. Bound antibody bridges different monomers in the trimer to prevent conformational changes required for infection. The crystal structure determined by Hastie et al. provides a template for vaccine development.

2017-06-09

封面上展不的是一個再生的斑馬魚心臟，其受傷后7天的心室頂端（圖中底部）。紅色著色部分是心外膜細胞層，綠色著色部分是轉基因cfefa表達，藍色著色部分是細胞核。與人類不同，斑馬魚受損的心肌能夠在30?60天內再生，而且傷口能愈合成微小的傷疤。從單個細胞到哺乳動物器官系統(tǒng)，疾病和傷害帶來的破壞常常是、但不總是通過修復和再生機制解決的。

A regenerating zebrafish heart， 7 days after injury to the apex of the ventricle （bottom）.Red stain， epicardial cell layer； green stain， transgenic ctgfa reporter expression； blue stain， cell nuclei. Unlike in humans， lost cardiac muscle regenerates in zebrafish in 30 to 60 days， with minimal scarring. From single cells to mammalian organ systems， the ravages of disease and injury are often， but not always， countered by repair and regeneration mechanisms.

2017-06-16

封面圖上展示的是通過藝術手法繪制的量子科學衛(wèi)星“墨子”。從圖中可以看到，2個糾纏態(tài)光子被分布到地球上距離約1200千米的2個位置。這種方法比通過光纖直接傳輸更有效，從而為全球范圍內的量子網(wǎng)絡，以及太空中的基礎量子光學實驗開辟了新途徑。

Artist's rendering of the quantum science satellite Micius， distributing two entangled photons to two locations separated by 1 200 kilometers on Earth. This approach is much more efficient than direct transmission through optical fibers， thus opening up a new avenue for global-scale quantum networks and foundational quantum optics experiments in space.endprint