The phrase "altered by variations" is correct and usable in written English.
It can be used when discussing changes or modifications that occur due to different factors or influences.
Example: "The final design of the product was altered by variations in customer feedback and market trends."
Alternatives: "modified by changes" or "adjusted by differences".
The source counts,, may also be altered by variations in exposure if the source is extended; however, correcting requires knowledge of, which is a priori unknown.
Results show that both pore structure and microstructure of the pastes were significantly altered by variations in compositions.
Independently of the present model, if synaptic weight dynamics are altered by variations in ongoing neuronal activity that are largely due to changes in an animal's environment and experiences, then in vivo distributions of synaptic weights cannot be expected to converge to equilibrium.
The targets of miRNAs can be altered by variations in the target sequences [ 64].
While it is well recognized that plasma levels of ANP are altered by variations in thoracic blood volume and during intravenous sodium loading [ 2], only incomplete data are available on the course of BNP during these interventions [ 3].
In additional, hemodynamics can be altered by variations in serum calcium through changes in left ventricular stroke volume and output [ 28]; and essential hypertension can alter calcium metabolism which in turn provokes the development of myocardial hypertrophy [ 57].
Fullerene moieties always exhibit strong π π interactions, while van der Waals interactions between alkyl chains can be altered by variation of their multiplicity.
The metabolic flux distribution can be altered by variation of NAD+/NADH ratio or r NAD +/r NADH ratio in glutamate fermentation [4].
For example, the DNA binding affinity and cytotoxicity of rebeccamycin (an antitumor drug with potential topoisomerase I poisoning effects) can be altered by variation in sugar moieties (Animati et al. [2008]).
Immune responses to HBV vaccination may therefore be altered by variation in the CD44 gene.
For all hotspots, the primary metabolites altered by variation at each hotspot were distributed across the primary metabolism pathways with no obvious strong qualitative network specific loci as previously found (Rowe et al., 2008).
