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Can Dandruff Shampoos Monitor Oxygen Levels in Oceans?
The same ingredient, which was used to fight off alien invaders in the film "Evolution" and is a widely available dietary supplement used by many people, is being used to study how the oxygen content of the oceans has changed over geologically recent time.
The ingredient, selenium, is an anti-oxidant and an essential trace nutrient in our diet. It belongs to a group of elements whose behaviour is controlled by the concentration of oxygen in the environment.
This study represents a first attempt by scientists to use selenium in this way and is part of research student, Andrew Shore's, PhD project. It involves measuring the isotopic ratios of selenium in sediments.
One possible outcome of the project is that the results could give scientists a global picture of the changing oxygen content of the oceans through time. Previous studies have tended to focus on local variations in ocean oxygen content.
The oxygen content of oceans can also be used as an indicator of the "overall health" of the oceans. The recent report from the Intergovernmental Panel on Climate Change (IPCC) states changes in fish populations are "associated with changes in oceanic oxygen levels."
Therefore an understanding of oxygen in the oceans is not only important for the past but also for the future.
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