[点击科学]2022年5月点击科学
2022-05/总第314期
2022-04-01
端粒到端粒(T2T)联盟已经完成了人类基因组计划初始阶段中8%尚未解决的具有挑战性的任务。在这项数据可视化中,每个染色体从右下角开始缠绕,X染色体和1到22染色体从外向内排列(Y染色体没有显示)。最新完成的区域用红色突出显示。
The Telomere-to-Telomere (T2T) Consortium has completed a challenging 8% of the human genome left unresolved by the initial Human Genome Project. In this data visualization, each chromosome begins at bottom right and wraps around, with chromosomes X and 1 through 22 arranged from the outside in (chromosome Y is not shown). The newly completed regions are highlighted in red.
2022-04-08
封面图展示的是W玻色子在粒子物理标准模型上的象征性图示,表明其重要性。弱核力的介质——也就是W玻色子的质量受到该理论的严格约束。一项新的、非常精确的W玻色子质量测量与标准模型预期之间存在一定差距,这表明可能需要改进计算方式或拓展标准模型。
Symbolic illustration of the W boson weighing down on the standard model of particle physics. The mass of the W boson, a mediator of the weak nuclear force, is tightly constrained by the theory. A new, very-high-precision measurement of the W boson mass is in significant tension with the standard model expectation and suggests that improvements to calculations or extensions to the standard model might be needed.
2022-04-15
封面图展示的是1个大约4.5毫米高,细节部分小至0.25毫米的玻璃结构,它是用微尺度计算轴向光刻技术进行3D打印,然后通过高温烧结制作出来的。该工艺能够合成具有精细细节的高透明度和惰性玻璃部件,适用于各种应用。
A glass structure about 4.5 mm tall with features as small as 0.25 mm is 3D printed with microscale computed axial lithography followed by high-temperature sintering. The process enables the synthesis of highly transparent and inert glass parts with fine details, which are useful for a variety of applications.
2022-04-22
在这张高分辨率电子显微图像的数字重建图中我们可以看到,杀伤性T细胞(红色)攻击了1个卵巢癌细胞(白色)。当T细胞试图摧毁它的目标时,其内部结构(细胞器)的位置就会显示出来。然而,癌细胞会通过激活一种机制封闭其质膜上的穿孔,从而抵抗这种攻击。
A killer T cell (red) attacks an ovarian cancer cell (white) in this digital reconstruction of high-resolution electron micrographs. A view into the T cell reveals the positions of its internal structures (organelles) at the precise moment that the T cell attempts to destroy its target. The cancer cell, however, resists this assault by activating a mechanism to seal perforations in its plasma membrane.
(陶 陶 编译)■