The phrase "at substantially lower levels" is correct and usable in written English.
It can be used when comparing quantities, measurements, or concentrations that are significantly reduced in comparison to a reference point.
Example: "The new filtration system was able to remove contaminants from the water at substantially lower levels than the previous model."
Alternatives: "at significantly reduced levels" or "at much lower levels".
So if oil were to stabilize at substantially lower levels, it would help their finances considerably.
While the debate today put on display the continuing deep differences between the parties over tax cuts, it also demonstrated that Democrats had become more willing to champion tax cuts of their own, although at substantially lower levels than sought by Republicans.
In the prevalence screen conducted in this study, the deregulated expression patterns detected in ∼50 ccRCC patients for five of the miRNAs further supported the finding that the miRNA genes located on Xq27.3 were expressed at substantially lower levels in at least 76.7% of primary ccRCCs compared to patient-matched normal adjacent controls.
(Fes is an exception because overexpression of E. coli Fes is toxic [14, Genobase ORF JW0576 - http://ecoli.naist.jp/GB6/info.jsp?id=JW0576].) It is not surprising that the unevolved novel sequences function at substantially lower levels than natural sequences selected by billions of years of evolution.
The remaining ABA metabolites were present at substantially lower levels.
Although clearly detectable, SPG20 was expressed at substantially lower levels than SYP.
4, 5, 6, 8, and 10) that did not show a visible CYP2C93 band in the gel (Fig. 1B), CYP2C93 mRNA was actually expressed, but at substantially lower level, as determined by real-time RT-PCR (data not shown).
This latter notion is further supported by our observation that cells transfected with E1-deleted vectors produce hexon transcripts albeit at substantially lower level than cells infected with a corresponding dose of wild-type virus.
In humans, a cysteine to tyrosine substitution at position 18 leads to substantially lower levels of BMI1 protein, and is present in the general population, including in the YRI and CEU (but not CHB) HapMap samples (Zhang and Sarge 2009).
The Bd3-1 spring type had substantially lower levels of IRIP expression at all time-points during cold acclimation, compared to the other Bd-lines in the study.
The ambulance personnel had higher levels of emotional demands and meaningfulness of and commitment to work, and substantially lower levels of quantitative demands and influence at work.
