Abstract An efficient and productive joining technique to weld aluminium has become a priority challenge for promoting the use of in electrical industry. One challenges is obtain welds with superior mechanical properties consistent quality surface as well low resistance. In this paper, influence rotational speed during friction stir spot welding AA 5754-H111 was studied analyse welds. The resul...

Friction stir welding has become important in many areas of production and is increasingly used for joining aluminum components. For long seams, conventional tools with only one pin reach their technical limitations due to low gap bridgeability. When aluminum, the stirred surface layers, such as oxides, lead a decrease static dynamic strength since linear accumulations are formed seam. The aim ...

Burkholderia cenocepacia has emerged as an important pathogen for patients suffering from cystic fibrosis (CF). Previous work has shown that this organism employs the CepIR quorum-sensing (QS) system to control the expression of virulence factors as well as the formation of biofilms. To date, however, very little is known about the QS-regulated virulence factors and virtually nothing about the ...

Here, we describe a new mechanism by which glutamate (Glu) and trace metals reciprocally modulate activity of the Ca(v)2.3 channel by profoundly shifting its voltage-dependent gating. We show that zinc and copper, at physiologically relevant concentrations, occupy an extracellular binding site on the surface of Ca(v)2.3 and hold the threshold for activation of these channels in a depolarized vo...