Linear relationship of normal and tangential contact stiffness with load.

Measurements with digital image correlation of normal and tangential contact stiffness for ground Ti-6Al-4V interfaces suggest a linear relationship between normal contact stiffness and normal load and a linear relationship between tangential contact stiffness and tangential load. The normal contact stiffness is observed approximately to be inversely proportional to an equivalent surface roughness parameter, defined for two surfaces in contact. The ratio of the tangential contact stiffness to the normal contact stiffness at the start of tangential loading is seen to be given approximately by the Mindlin ratio.

Antimicrobial resistance in water in Latin America and the Caribbean: a scoping review protocol.

Objective: The objective of this scoping review is to identify and map existing evidence of antimicrobial resistance (AMR) in water in Latin America and the Caribbean (LAC), while also identifying the gaps in AMR information in the region in eight themes of interest.

Introduction: Antimicrobial resistance is a public health concern that has gained increasing global awareness. Concerns have been raised toward the importance of the environment's role in the dissemination of clinically relevant AMR.

Occurrence of Downy Mildew on Sunflower in South Africa.

Downy mildew, caused by Plasmopara halstedii (Farl.) Berl. & De Toni in Sacc.