Influence of Surface Roughness on the Properties of Nitrided Layer on 42CrMo4 Steel.

A crucial factor of a nitriding process of treated parts is surface roughness. Eight samples of 42CrMo4 steel were used to investigate the parameter represented by Ra. In the study, the innovative combined microhardness profiles were used to present results within the compound zone and diffusion layer.

[Spinal pain syndromes and constitutional hypermobility].

Introduction: The most common cause of spinal pain syndromes (SPS) is overload of the spine. It damages the function of the spine and the morphology of the spine's tissues. The literature suggests that a generalized insufficiency of connective tissue, which manifests itself as a hypermobility of joints (JHM), might be one of the causes of overload.