fine dust from the car exhaust gases to enter the lungs and affect the long-term health. But how it looks with the particles from aircraft engines? The tested for Researchers to Marianne Geiser of the University of Bern, together with colleagues from Empa and the University of applied Sciences northwestern Switzerland (FHNW) at the world’s most widely used type of turbine and human lung cells, such as the University of Bern announced on Thursday.

The cell-damaging effect of particles from the kerosene combustion is similar to that of gasoline and diesel drives, according to the findings of the study, published in the journal “Nature Communications Biology”. Above all, the primary soot Particles can damage the lung cells and inflammatory reactions. In addition, biofuel is in addition to kerosene to nearly a third of animal and vegetable fats does not seem to be necessarily better than conventional jet fuel.

For the study, the researchers left the Turbine, a “CFM56-7B Turbofan” with kerosene or bio-fuel on a test bench operating at idle, takeoff, climb-out, and other engine performance readjust. The exhaust gases conducted in a so-called Aerosol deposition chamber was developed at the FHNW. In it human bronchial epithelial cells, the lining in the body of the human bronchi are located.

The researchers exposed the cells for one hour in the exhaust gases. So you were able to test under realistic conditions, such as the exhaust-gas particles deposited during this time on the lung cells and what reactions they trigger. Including, for example, damage to the cell Stress, the faster aging of cells and trigger cancer can be membranes and oxidative.

The strongest reactions showed that the lung cells, therefore, in the case of conventional kerosene in the turbine idle. This was surprising, since the quantity of Particles that had deposited on the cells, was actually far lower than at full turbine power. The reason for this is that the resulting particles differ at idle and Start-up or climb-out, declared Geiser to the news Agency Keystone-SDA.

In the idle, therefore, the particles with a texture, the trigger in spite of the lower dose is much stronger reactions in a Cell. “This shows that not only the dose but also the nature of the particles for health effects are relevant”, said the researcher.

For the biofuel showed the strongest cellular response in the climb. Especially, the cells of this amplified inflammatory factors (Cytokines) poured out. “These reactions reduce the ability of airway cells to respond to subsequent viral or bacterial attack,” says Geiser.

The focus in this study on the so-called primary particles, so the particles that are directly poking at the fuel combustion out of, said Geiser. With increasing distance to the turbines, these would be converted into primary particles, and would then have other effects.

the results of The study could thus be, in particular, for the airport staff significantly, which is, for example, exposed during the Loading and Unloading of the aircraft, the exhaust gases in the immediate vicinity of the turbines. (SDA)