The phrase "alterations in frequency" is correct and usable in written English.
It can be used in contexts discussing changes or variations in the rate of occurrence of something, such as sound waves, signals, or events.
Example: "The study focused on the alterations in frequency of the sound waves produced by the instrument under different conditions."
Alternatives: "changes in frequency" or "variations in frequency".
These age-associated alterations in the frequency, developmental potential, and gene expression profile of human HSC are similar to those changes observed in mouse HSC, suggesting that hematopoietic aging is an evolutionarily conserved process.
These results may aid in assessing differences in water use and the ability of bottomland deciduous species to tolerate alterations in the frequency or amount of precipitation.
Moreover, several psychoactive drugs produce blood pressure changes and alterations in respiratory frequency that may perturb central haemodynamic readouts of brain function.
Main Outcome Measures: Absolute and normalized values of isometric strength; and alterations in the frequency of cocontraction at 6 months and 1 year postoperatively.
Many regional and global scale studies suggest increases in exposure to hydrometeorological hazards, in particular from climate change-induced alterations in the frequency, intensity, and extent of extreme events (IPCC 2012).
Indeed, the mdx mouse model has alterations in ventilatory frequency and responses to hypoxia compared to normal mouse.
However, there have been several studies that showed alterations in mEPSC frequency either with or without concurrent changes in amplitudes [4], [7], [22].
Likewise, analysis of regulatory T cells showed no alterations in the frequency of CD4SP thymocytes expressing FoxP3 or CD25 nor CD4SP splenocytes expressing FoxP3 (Figure S1).
We searched for non-random alterations in the frequency of contacts between the PADI3 gene promoter and PIE in living keratinocytes by the use of Chromosome Conformation Capture (3C, Fig. 4) [44].
