
2020-06-19
封面圖展示的是在感染后,SARS-CoV-2(圖中藍色部分)利用宿主機制產生用于復制的多蛋白。病毒主蛋白酶(圖中黃色部分)在多蛋白裂解中扮演了一個關鍵的角色,因此它是一個潛在的藥物靶點。研究人員設計了2種抗病毒化合物,用來抑制主要蛋白酶的活性,從而防止病毒復制。臨床前研究表明,這些化合物是非常有前途的治療候選藥物。
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
封面插圖展示的是格陵蘭雪橇犬,它們在做著其祖先做了無數代的工作。通過對1只9500年前犬的基因組進行測序顯示,現代的犬,特別是雪橇犬,在全新世早期就與狼的基因不同了。在所有的現代雪橇犬中,格陵蘭雪橇犬與最早的雪橇犬有著最為相似的基因血統,從而著重強調了對這個品種的保護價值。
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礦物質染成藍色的La PozaAzul II,它是墨西哥北部沙漠綠洲城市夸特羅謝內加斯數以百計的涌泉池之一,這里保存著與古代海洋近似的種類繁多的微生物。然而農業排水系統正在時刻威脅著這片獨特的綠洲生態系統。
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
封面圖上展示的是一種埃及果蝠,當它們成年以后就會像封面上的這只果蝠一樣離開自己的棲息地。通過觀察大量的埃及果蝠,科學家發現蝙蝠會利用一種認知地圖在復雜的環境中為自己導航。
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 編譯)