The phrase "altered over a" is not complete and lacks context, making it difficult to determine its correctness in written English.
It could be used in contexts discussing changes or modifications that occur over a period of time or across a range of conditions.
Example: "The design of the product was altered over a series of iterations to improve functionality."
Alternatives: "modified throughout a" or "changed during a".
Some epoxies have altered over a relatively short period of time and dramatically changed the appearance of the sculpture, while other synthetic consolidants have proved unable to penetrate deeply enough into the stone, and their application has resulted in a thin, dense, and impermeable crust that falls away owing to the buildup of salts or water vapour behind it.
Figure 5 also showed that the point of transition from high viscosity to low viscosity was sharp, and the shear stress level could be altered over a modest range by changing the hydrophobicity and the amount of the added nanoparticles.
The chemical may be introduced at a precise time, the dose can be altered over a large range and the chemical may be removed simply by replacing the medium surrounding the embryo.
In two cell lines gene dosage was altered over a chromosomal region that spanned 14 genes on mouse chromosome 17.
Transfusion use was not altered over a 28-day period following administration of tranexamic acid.
The remaining lines showed variable fractions of the genome altered over a continuum; no discrete categories could be identified.
Second, macrophage activity may alter over time as a consequence of tumour-induced immune dysfunction, since nitric oxide production, which is a major effector molecule for tumour cell killing, was suppressed in macrophages of tumour-bearing mice [ 32].
Once a rule is implemented its adoption may alter over time.
Given the changing demography of the student population, this may alter over time.
But if prices at the top end of the art market can change so much in 18 months, how might they alter over a much longer timeframe?
Only performing imaging at a single time point (4 or 24 h) is another potential limitation, although recent evidence suggests that the Y-90 activity distribution on SPECT/CT imaging does not significantly alter over a 72 h period [14].
