2020-06-19
封面图展示的是在感染后,SARS-CoV-2(图中蓝色部分)利用宿主机制产生用于复制的多蛋白。病毒主蛋白酶(图中黄色部分)在多蛋白裂解中扮演了一个关键的角色,因此它是一个潜在的药物靶点。研究人员设计了2种抗病毒化合物,用来抑制主要蛋白酶的活性,从而防止病毒复制。临床前研究表明,这些化合物是非常有前途的治疗候选药物。
Upon infection,SARS-CoV-2 (blue) useshost machinery to producepolyproteins for replication. Theviral main protease (yellow)plays a key role in polyproteincleavage and thus is a potentialdrug target. Researchers havedesigned two antiviral compoundsthat inhibit activity of themain protease to prevent viralreplication. Preclinical studiesshow that these compounds arepromising therapeutic candidates.
2020-06-26
封面插图展示的是格陵兰雪橇犬,它们在做着其祖先做了无数代的工作。通过对1只9500年前犬的基因组进行测序显示,现代的犬,特别是雪橇犬,在全新世早期就与狼的基因不同了。在所有的现代雪橇犬中,格陵兰雪橇犬与最早的雪橇犬有着最为相似的基因血统,从而着重强调了对这个品种的保护价值。
Greenland sled dogs do thesame job their ancestors havedone for countless generations.Sequencing of a 9500-vear-olddog genome reveals that moderndogs-particularly sled dogs-weregenetically distinct from wolvesby the early Holocene. Of allmodern sled dogs, the Greenlandsled dog shares the most genomicancestry with the first sled dogs,emphasizing the conservation valueof this breed.
2020-07-03
封面插圖展示的是被矿物质染成蓝色的La PozaAzul II,它是墨西哥北部沙漠绿洲城市夸特罗谢内加斯数以百计的涌泉池之一,这里保存着与古代海洋近似的种类繁多的微生物。然而农业排水系统正在时刻威胁着这片独特的绿洲生态系统。
Tinged blue with minerals,La Poza Azul II is one ofhundreds of spring-fed pools inCuatro Cienegas.
an oasis inthe desert of northern Mexicothat preserves a vast diversityof microbes resembling thosein ancient oceans. Drainage foragriculture threatens the uniqueecosystems of this oasis.
2020-07-10
封面图上展示的是一种埃及果蝠,当它们成年以后就会像封面上的这只果蝠一样离开自己的栖息地。通过观察大量的埃及果蝠,科学家发现蝙蝠会利用一种认知地图在复杂的环境中为自己导航。
Monitoring large numbersof Egyptian fruit bats, likethis one leaving its colony.and doing so as they matureinto adults, suggests that batsnavigate through their complexenvironment using a cognitivemap.
(陶陶 编译)