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
Two decades of training students and experts in tracking infectious disease
27.11.2015 | Hochschule für Angewandte Wissenschaften Hamburg
Increased carbon dioxide enhances plankton growth, opposite of what was expected
27.11.2015 | Bigelow Laboratory for Ocean Sciences
Planet Earth experienced a global climate shift in the late 1980s on an unprecedented scale, fuelled by anthropogenic warming and a volcanic eruption, according to new research published this week.
Scientists say that a major step change, or ‘regime shift’, in the Earth’s biophysical systems, from the upper atmosphere to the depths of the ocean and from...
The Fraunhofer Institute for Solar Energy Systems ISE has installed 70 photovoltaic modules on the outer façade of one of its lab buildings. The modules were...
Nerve cells cover their high energy demand with glucose and lactate. Scientists of the University of Zurich now provide new support for this. They show for the first time in the intact mouse brain evidence for an exchange of lactate between different brain cells. With this study they were able to confirm a 20-year old hypothesis.
In comparison to other organs, the human brain has the highest energy requirements. The supply of energy for nerve cells and the particular role of lactic acid...
In laser material processing, the simulation of processes has made great strides over the past few years. Today, the software can predict relatively well what will happen on the workpiece. Unfortunately, it is also highly complex and requires a lot of computing time. Thanks to clever simplification, experts from Fraunhofer ILT are now able to offer the first-ever simulation software that calculates processes in real time and also runs on tablet computers and smartphones. The fast software enables users to do without expensive experiments and to find optimum process parameters even more effectively.
Before now, the reliable simulation of laser processes was a job for experts. Armed with sophisticated software packages and after many hours on computer...
Researchers at Heidelberg University have devised a new way to study the phenomenon of magnetism. Using ultracold atoms at near absolute zero, they prepared a...
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27.11.2015 | Life Sciences
27.11.2015 | Materials Sciences