Bogdan’s results show that mixture droplets consisting of sulphuric acid and water can be slowly cooled down to -140 degrees Celsius and then heated again without ice formation. The formation of ice is particularly problematic in cryopreservation, as the crystal formation damages cell structures.
Bogdan has conducted his experiments by cooling and heating droplets of 0.5-6 µm in diameter. His study focuses on two forms of water: low-density amorphous ice (LDA, or so-called glassy water) and highly viscous water (HVW), which is a liquid phase that LDA melts into. Bogdan reports that HVW is not a new form of water as some scientists believed. Bogdan’s study Reversible Formation of Glassy Water in Slowly cooling Diluted Drops has been published in Journal of Physical Chemistry in June 2006.
Bogdan himself applies his observations on the properties of water in cloud research, and he and his colleagues have recently published a study dealing with cirrus clouds (Formation of Low-Temperature Cirrus from H2SO4/H2O Aerosol Droplets, Journal of Physical Chemistry, November 2006). Their study suggests that, unlike previously thought, the cloud crystals in cirrus clouds are not completely solid ice, but are covered with a layer of liquid water and sulphuric acid. The layer effects for instance the reflectivity of the clouds, and therefore the climate. It has also been observed that the rate of ozone loss is higher on liquid than on solid surfaces. The results therefore indicate that the ozone is destroyed in the cirrus clouds faster than conventionally has been thought.
Minna Meriläinen | alfa
Despite government claims, orangutan populations have not increased. Call for better monitoring
06.11.2018 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
Increasing frequency of ocean storms could alter kelp forest ecosystems
30.10.2018 | University of Virginia
Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
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06.11.2018 | Event News
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16.11.2018 | Health and Medicine
16.11.2018 | Life Sciences
16.11.2018 | Life Sciences