Lithium derivatives of 12-hydroxystearate and other fatty acids are important constituents of lubricating greases. Soaps are key components of most lubricating greases and thickeners. Three-spindle screw pumps are used for transport of viscous fluids with lubricating properties. They are lined with a synovial membrane that secretes a lubricating synovial fluid. Also a limited use of talc as friction-reducing additive in lubricating oils is made. It is mostly used to characterize the viscosity-temperature behavior of lubricating oils. Maintenance on bearings includes periodically cleaning and lubricating them. Both gears are enclosed in a liquid-tight housing containing lubricating oil. Normally, the two layers are separated by a small amount of lubricating serous fluid. The vaginal walls begin to produce a lubricating organic liquid. Alkanes from hexadecane upwards form the most important components of fuel oil and lubricating oil. The vaginal walls begin to produce a lubricating liquid. Mineral oil enemas can assist by lubricating the stool for easier passage. Along with lubricin, it is one of the fluid's main lubricating components. Complications can be prevented by use of wetting and lubricating drops and ointments.