The phrase "are controlled by variations" is correct and usable in written English.
It can be used in contexts where you want to describe how certain factors or elements are influenced or regulated by changes or differences.
Example: "The outcomes of the experiment are controlled by variations in temperature and pressure."
Alternatives: "are influenced by changes" or "are determined by fluctuations."
The pore diameter and the porous layer depth of the PSi were 20 80 nm and 8 50 μm, respectively, and they are controlled by variation of the HF concentration and anodization time.
We show that ccβ-Met forms amyloid-like fibrils of different morphologies on both the macroscopic and atomic levels, which can be controlled by variations of assembly conditions.
Our results suggest that tectonic tremors recorded within subduction zones reflect the transient rheology of the materials being subducted, which is controlled by variations in temperature along the plate interface.
We find that reef architecture around Barbados has significant complexity including evidence for wave exposure-related variations in reef geometry and at least 3 stages of reef development that were controlled by variations in sea level.
In the subsoil, in contrast, the variation of maize C incorporation into the SOC pool was controlled by variations in maize yield (R2 = 0.44), which also exhibited a pronounced spatial variability (0.84 to 1.94 kg dry biomass m−2), and which was negatively correlated with the amount of rock fragments (R2 = 0.48, p < 0.001).
Together, these results suggest that netrin-1 function may contribute to the plasticity, function and peri-pubertal reorganization of mesocorticolimbic DA systems and that these effects are likely to be controlled by variations in the levels of netrin-1 receptor expression by DA neurons.
CNGC channels can be controlled by variations in the phosphorylation state catalyzed by Ser/Thr kinases [ 44] and phosphatases [ 45].
We demonstrated a metamaterial absorber (MMA), which can be controlled by variation of conductivity or temperature.
The structure period could be controlled by variation of the incidence angle of the laser beam.
The spectral shape and intensity of defect-related fluorescence can be controlled by variation of detection angle.
