The phrase "at the background level" is correct and usable in written English.
It can be used to refer to something that is occurring or existing at a foundational or underlying level, often in a context where multiple layers or levels are being discussed.
Example: "The changes in policy will affect the organization at the background level, influencing how decisions are made."
Alternatives: "at the foundational level" or "at the underlying level".
What no one did was look "at the background level of systems falling over", he suggests.
Two individuals showed soil Hg concentrations at the background level, below ca. 100 ng g-1, whereas soil samples surrounding the other five individuals exhibited much larger Hg concentrations.
The other individual was selected because the single femoral sample featured an Hg concentration at the background level, which indicated that the individual was not exposed to Hg above the environmental background level.
In fact, it appears that it may even reach the trench location, although the amplitude of high-frequency energy release is almost at the background level by the time the energy arrives at the trench.
This operation smoothes all 'holes' in the intensity graph and fills them up at the background level and the name 'Closing' is intuitively clear.
The addition of dominant negative TCF plasmids (dnTCF) decreased the reporter activity in HB1.F3 close to the level of F3.Olig2, indicating that the Wnt activity in F3.Olig2 is at the background level.
For the low threshold image, the threshold has been set at about the background level of the phantom which is due to e.g. excitation light leakage through the emission filter, fluorescence emission light scatter, and autofluorescence of the phantom [32].
In contrast, cohesin binding to chromosomes in smc3-D1161E SMcellsD cells was essentially at the background levels observed in SMC3-AID-only cells.
Cells were considered positive for a message (for either DIG or 35S) if the signal was at least twice the background level.
Regional pollutant concentrations aggregated to the census block group level that exceeded background levels were reduced linearly, whereas we assumed that concentrations at or below the background level would be unaffected by changes in emissions.
Eighty-seven well-defined structures were selected, containing a marked increase of Te at least 20% above the background level.
