It has hitherto not been known that higher organisms, such as green algae, can communicate with bacteria. But Debra Milton, associate professor at Umeå University in Sweden, shows in the recent issue of the prominent journal Science that bacteria attract green algae with the aid of signal molecules. Surfaces under water are rapidly colonized by bacteria, which cover the surface with a thin film known as biofilm. Within this biofilm bacteria coordinate activities among the cells with the help of chemical signal molecules, such as N-acyl homoserine lactones (AHL). It is well known that bacteria produce and make use of AHL-signal molecules. On the other hand, it has not been known that organisms, such as algae, also have the capacity to make use of these signal molecules.
Enteromorpha is a common green alga that binds to and thereby damages human constructions like oil rigs, pipes, vessels, etc. This has led to many unwanted problems, such as increased friction for ships, which in turn leads to increased fuel costs, deposition of minerals, and degradation of materials, all entailing major economic consequences.
Green algae are spread in water by producing mobile microscopic zoospores that seek out suitable surfaces on which to adhere. Once these spores have found a suitable place, they excrete an adhesive molecule that permanently fastens the zoospore to the surface, and a new alga can develop and grow. Researchers have previously shown that zoospores adhere to bacteria cells and that biofilm increases the number of zoospores that latch on to such surfaces.
Karin Wikman | alfa
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20.01.2017 | GSI Helmholtzzentrum für Schwerionenforschung GmbH
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20.01.2017 | DOE/Joint Genome Institute
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
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Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
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Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
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