2020-06-19
封面圖展示的是在感染后,SARS-CoV-2(圖中藍(lán)色部分)利用宿主機(jī)制產(chǎn)生用于復(fù)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(guān)鍵的角色,因此它是一個潛在的藥物靶點。研究人員設(shè)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(fù)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(shù)代的工作。通過對1只9500年前犬的基因組進(jìn)行測序顯示,現(xiàn)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(xiàn)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(tǒng),從而著重強(qiáng)調(diào)了對這個品種的保護(hù)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(zhì)染成藍(lán)色的La PozaAzul II,它是墨西哥北部沙漠綠洲城市夸特羅謝內(nèi)加斯數(shù)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(nóng)業(yè)排水系統(tǒng)正在時刻威脅著這片獨(dú)特的綠洲生態(tài)系統(tǒng)。
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(dāng)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(xué)家發(fā)現(xiàn)蝙蝠會利用一種認(rèn)知地圖在復(fù)雜的環(huán)境中為自己導(dǎo)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)