"kept at the minimum" is a correct and usable phrase in written English.
It means to maintain something at the lowest or smallest level possible. Example: The company implemented cost-cutting measures to keep expenses at the minimum.
The properties of the welded metals can improve significantly if the IMC layers are kept at the minimum.
The amount of water needed is not a critical factor, since it is generated in the fuel cell and quantities of water-makeup can be kept at the minimum level.
Laser intensity in all these experiments was kept at the minimum and acquisition conditions maintained mostly unchanged over the different days of observation.
Moreover, the accuracy of the exon length estimation for any species will increase if more data are available and if the ascertainment bias (e.g. resulting from overrepresentation of certain gene families in the sample, or from inclusion of only partially sequenced genes) is kept at the minimum.
When capturing images, the ambient light level was kept at the minimum to avoid any influence on the laser light and the quality of the recorded perfusion signal.
The number of animals per each group was kept at the minimum that allowed meaningful conclusions; n's for each group are given in the figure legends.
References to studies not listed in PEDro were kept at the absolute minimum and marked by an asterisk.
Consequently, the later a unit was taken out of the box the more this unit would experience light from the laboratory illumination (In the second experiment this exposure to external light was kept at a minimum: the box was opened in a dark room with a few standby-lights of incubators only).
Nature, is a big factory, where the faults are kept at a minimum, choosing the most suitable material of all for the purpose, recycling them, and even changing every ingredient as conditions impose.
Images were collected at 1 min intervals with the laser transmission kept at a minimum while the detector gain was kept at 70−80% of the maximal sensitivity.
The special effects, which were kept at a minimum in the first movie, took over: The picture was mostly whoosh and slime and klutzy physical jokes.
