(Phys.org) -- It's almost an evil twin story: a protein that steals electrons from iron in one microbe looks a lot like one that adds electrons in another microbe, according to scientists at Pacific Northwest National Laboratory ...
Biochemistry
Aug 20, 2012
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1
Oxygen concentrations in both the open ocean and coastal waters have declined by 2-5% since at least the middle of the 20th century.
Ecology
Jun 17, 2019
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263
The amount of dissolved oxygen in a river is a matter of life or death for the plants and animals living within it, but this oxygen concentration varies drastically from one river to another, depending on their unique temperature, ...
Environment
Apr 7, 2023
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105
An international team of researchers led by Ralf Tappert, University of Innsbruck, reconstructed the composition of the Earth's atmosphere of the last 220 million years by analyzing modern and fossil plant resins. The results ...
Earth Sciences
Nov 18, 2013
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4
Shungite, a unique carbon-rich sedimentary rock from Russia deposited 2 billion years ago, holds clues about oxygen concentrations on Earth's surface at that time. Led by Professor Kurt Konhauser at the University of Alberta ...
Earth Sciences
Mar 24, 2020
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18
The Ediacaran Period, an interval in Earth's history after the Snowball Earth glaciations but before the Cambrian radiations, marks the introduction of complex macroscopic organisms synchronously in unrelated groups. It has ...
Earth Sciences
Mar 20, 2012
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0
Variations in the Earth's atmospheric oxygen levels are thought to be closely linked to the evolution of life, with strong feedbacks between uni- and multicellular life and oxygen. Over the past 400 million years the level ...
Earth Sciences
Aug 2, 2010
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The waters of the St. Lawrence Estuary are running out of breath. The lack of oxygen in deep waters is affecting the organisms that live on the bottom of the estuary.
Ecology
Nov 22, 2023
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1
Scientists investigating one of the greatest riddles of the Earth's past may have discovered a mechanism to help determine how oxygen levels in the atmosphere expanded to allow life to evolve.
Earth Sciences
Jun 9, 2014
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0
By examining rocks at the bottom of ancient oceans, an international group of researchers have revealed that arsenic concentrations in the oceans have varied greatly over time. But also that in the very early oceans, arsenic ...
Earth Sciences
Dec 4, 2015
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