The phrase "a substantially higher concentration" is correct and usable in written English.
It can be used when discussing differences in levels or amounts of a substance, often in scientific or analytical contexts.
Example: "The new formula resulted in a substantially higher concentration of active ingredients compared to the previous version."
Alternatives: "a significantly greater concentration" or "a markedly higher concentration".
Dr. Cheng also found that egg yolks had a substantially higher concentration of lead than whites, something that scientists previously identified in a study of hens on a small farm in Iowa exposed to lead-based paint.
But, for example, in the case where one of the biosensors is used at a substantially higher concentration than the others, the bleedthrough would cause artifacts in the multiple imaging experiments.
The resultant product (AZD9773) contains a substantially higher concentration of non-specific Fab fragments than CytoFab.
In both industrialized and developing countries, urban areas almost invariably have a substantially higher concentration of physicians than rural areas.
The change was relatively small when the target site on the probe DNA (2.5 nM) was outcompeted by the high-affinity quasi-specific site of a substantially higher concentration (e.g., see the data with 50 nM DNA LT in Figure 2 B).
To a large degree, these differences reflect the substantially higher concentration of the positive charge on the carbon nucleus relative to the size of the carbon atom.
Such a stoichiometry would require substantially higher concentrations of Fabs to inhibit infectivity, as seen with CHK-9, m10 and m242 Fabs.
The first was a 1∶1 mixture of total DNA from each species, and the second was an artificial template with substantially higher concentrations of the target regions.
We, therefore, checked the dependence of the modified Förster model on the killer density for wires with a substantially higher Mn concentration.
Figure 3 shows that compared to the general population of the United States, our urban population of expecting women is exposed to substantially higher concentrations of TCS and at a higher frequency (100% compared to 74.6%).
Also characteristic of the atmosphere over urban centres are substantially higher concentrations of pollutants such as carbon monoxide, the oxides of sulfur and nitrogen, hydrocarbons, oxidants, and particulate matter.
