THE USE OF REPEATED DEVELOPMENT IN SPREAD-LAYER CHROMATOGRAPHY.
Abstract The relationship for “ R F ” of some steroids after repeated developement in different systems was found to be valid in spread-layer chromatography and a relationship for the mobility of some steroids developed several times in the same system was also established.
Ridges and valleys in many landscapes are uniformly spaced, but no theory has predicted this fundamental topographic wavelength. A characteristic length scale is now derived from equations of mass conservation and sediment transport; it is found to be directly proportional to the valley spacing in models of landform evolution, and to the measured valley spacing at five study sites in the USA.