Scientists know that injecting iron into some major regions of the oceans can stimulate the growth of diatoms and other phytoplankton, but something odd occurs as these tiny marine plants continue to grow. They begin to starve in the midst of plenty, acting as though iron, an essential nutrient, still is in short supply. Why this happens is unclear, but the answer could be that iron sets off a kind of chemical warfare in the marine ecosystem, according to University of Maine oceanographer Mark Wells. And diatoms may not always come out on top.
In collaboration with a large Japanese research program, Wells and a team of scientists from UMaine and other universities are studying the fate of iron in marine waters. Their findings could help determine the fate of something else, a controversial proposal to address the threat of global warming. The National Science Foundation and the U.S. Department of Energy are providing financial support.
Field work got underway in July, 2004, when Wells served as chief scientist on the Kilo Moana, a research ship that left Hawaii, bound for the sub-Arctic waters of the western Pacific. Owned by the Office of Naval Research and operated by the University of Hawaii, the ship was loaded with equipment and supplies, ready for an extended stay at sea. Its subsurface pontoon hull give it more stability in choppy seas, a benefit to Wells who normally gets seasick on these voyages.
Mark Wells | EurekAlert!
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Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
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