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Showing results 21-31 of 31 for 'Water'

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    Saving Reefs One Polyp at a Time

    Coral reefs are the canaries in our environmental coal mine, serving as front-line warnings of damage from climate change. They are also, as <em>The Scientist</em> says, ""notoriously difficult to study."" Until now. Weizmann scientists have ""discovered how to study coral organisms in unpresented detail"" – a breakthrough that could help grow healthy new coral.

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    The Active Life of Coral, Visualized

    As <em>Wired</em> reports, scientists at MIT and the Weizmann Institute took a close – very close – look at coral to better understand how it engineers its environment. The stunning graphic above, condensed from multiple microscopic images, shows the delicate motions of cilia, which move as ""the corals breathe, feed and clean themselves.""

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    First Oceans May Have Been Acidic

    Looking back at the very earliest oceans, Dr. Itay Halevy found that they started off acidic and gradually became alkaline. His work sheds light on how levels of ocean acidity in the past were controlled by carbon dioxide in the atmosphere, an important process for understanding the effects of climate change, as today the oceans are again becoming acidic.

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    Controlling Electron Spin for Efficient Water Splitting

    Splitting water molecules to produce hydrogen for fuel holds promise for alternative energy. However, current methods of water splitting also form hydrogen peroxide, which adversely affects the process. Now, Prof. Ron Naaman and an international team have found a way to control the spin of electrons, resulting in hydrogen-peroxide-free water splitting.

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    Self-Organization Makes for Efficient Separation

    Separation technology is at the heart of water purification, sewage treatment, and materials reclamation, as well as numerous basic industrial processes. Membranes are used to separate out the smallest nanoscale particles, and even molecules and metal ions. Prof. Boris Rybtchinski and his group of the Weizmann Institute of Science’s Department of Organic Chemistry have developed a new type of membrane that could extend the life of a separation system, lower its cost and, in some cases, increase its efficiency as well.

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    Recipe Unearthed for Mystery Clouds

    The weather forecast had predicted a cloudless day, but when Ilan Koren, an atmospheric scientist, looked up he saw small “cotton wool” clouds dotted across the bright blue sky over Israel. “Mystery” clouds like these are common on hot sunny days along humid sub-tropical shores, like those along the Mediterranean. Yet classical physics suggests these clouds shouldn’t exist. Now scientists think they might have finally solved the puzzle of how mystery clouds are made.