https://www.nature.com/articles/d41586-021-00436-x 17 February 2021 Million-year-old mammoth genomes shatter record for oldest ancient DNA Permafrost-preserved teeth, up to 1.6 million years old, identify a new kind of mammoth in Siberia.
https://www.sciencedirect.com/science/article/abs/pii/S0378112720310094?via%3Dihub Forest Ecology and Management Volume 472, 15 September 2020, 118240 Forest Ecology and Management Rethinking foundation species in a changing world: The case for Rhododendron maximum as an emerging foundation species in shifting ecosystems of the southern Appalachians
https://science.sciencemag.org/content/371/6536/1346 A 35-million-year record of seawater stable Sr isotopes reveals a fluctuating global carbon cycle Science 26 Mar 2021: Vol. 371, Issue 6536, pp. 1346-1350 DOI: 10.1126/science.aaz9266 海水中のSr安定同位体の3,500万年分の記録から、 変動する地球規模の炭素循環が明らかに
The researchers began studying sulfur-oxidizing bacteria -- a group of microbes that use sulfur as an energy source -- in methane seeps on the ocean floor. Akin to deep-sea coral reefs, these seeps contain limestone that traps large amounts of carbon. The sulfur-oxidizing microbes live on top of the limestone rocks.
After noticing patterns of corrosion and holes in the limestone, the researchers found that in the process of oxidizing sulfur, the bacteria create an acidic reaction that dissolves the rocks and releases the carbon that was trapped inside the limestone. https://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=302537&WT.mc_id=USNSF_1 研究者たちは、海底のメタン湧出層に生息する硫黄酸化細菌の研究を始めた。 メタンハイドレートは、深海のサンゴ礁のようなもので、大量の炭素を含む石灰岩を含んでおり、 硫黄を酸化する微生物は、この石灰岩の上に生息している。
https://advances.sciencemag.org/content/7/20/eabe7798 A slip law for hard-bedded glaciers derived from observed bed topography Science Advances 14 May 2021: Vol. 7, no. 20, eabe7798 DOI: 10.1126/sciadv.abe7798 概要
Nutrient content and stoichiometry of pelagic Sargassum reflects increasing nitrogen availability in the Atlantic Basin 大西洋海盆における窒素供給量の増加を反映した外洋性サルガッソーの栄養成分と化学組成
RESEARCH REPORT| 15 June 2021 Cantil: a previously unreported organ in wild-type Arabidopsis regulated by FT, ERECTA and heterotrimeric G proteins カンティル：FT、ERECTA、ヘテロ三量体Gタンパク質によって制御される野生型シロイヌナズナのこれまでに報告されていない器官。