Kelp that grows in the upper tidal zone, such as bladder wrack and knotted wrack, is especially rich in phlorotannins. But the concentration of the compounds varies considerably. Elisabet Brock has studied what influences this concentration and presents in her dissertation findings that show that dessication and exposure to UVB radiation, on the one hand, and, on the other, animals that eat algae affect the levels of phlorotannins in bladder wrack and knotted wrack.
Since bladder wrack and knotted wrack on the west coast of Sweden grow close to the waterline, they are exposed to environmentally varying conditions. Even though the tides only marginally affect the sea level, climate changes can create differences of up to two meters in the level of the seas. This in turn means that algae dry out, and without the protection of water the dry algae are exposed to stronger solar radiation.
As long as the algae are covered by sea water, the levels of phlorotannins increase in tissues, but when they dry out the chemical compounds are disseminated to the surface of the algae. If this is an active process, one of the functions of the phlorotannins could be to serve as a sun block, according to Elisabet Brock's findings in her dissertation. If the compounds are also secreted into the sea, a further ecological effect could be to protect other organisms that are close to the surface from harmful radiation.
Phlorotannins have also been proven to have other ecologically interesting effects. The dissertation presents findings that show that phlorotannins in extracts have an inhibitory effect on the willingness of acorn barnacle larvae to take hold. This effect proved for the most part to be dependent on the concentration of phlorotannins, but also on what type of algae were tested. The findings thus indicate that phlorotannins should be interesting substances for use in the production of environmentally friendly paint for boat hulls.
For more information, please contact Elisabet Brock, Department of Marine Ecology, Göteborg University, cell phone: +46 702-47 49 50; e-mail: email@example.com or her supervisor Henrik Pavia, phone: +46 526-686 85; e-mail: Henrik.Pavia@tmbl.gu.se.
Title of dissertation: Phlorotannins in Intertidal Brown Algae: Inducing Factors and Ecological Roles. The dissertation has been publicly defended.
Camilla Carlsson | idw
When Air is in Short Supply - Shedding light on plant stress reactions when oxygen runs short
23.03.2017 | Institut für Pflanzenbiochemie
WPI team grows heart tissue on spinach leaves
23.03.2017 | Worcester Polytechnic Institute
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
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.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
23.03.2017 | Life Sciences
23.03.2017 | Power and Electrical Engineering
23.03.2017 | Earth Sciences