The phrase "alterations have not" is correct and usable in written English.
It can be used when discussing changes or modifications that have not occurred or been made.
Example: "The alterations have not been implemented as planned, leading to delays in the project."
Alternatives: "changes have not" or "modifications have not".
The inherent manipulability of the ruminal fermentation has largely been explored by altering substrate (i.e., diet composition) or by adding specific metabolic inhibitors (e.g., of methanogenesis), but the limits to which the fermentation can be altered, and the mechanisms underlying these alterations, have not been firmly established (Ungerfeld 2015).
Information about further scheduling alterations have not yet been announced.
These alterations have not so much transformed Gansevoort as rendered it slightly surreal.
The corresponding microanatomical alterations have not been fully described, hindering progress toward understanding their pathogenesis and devising appropriate treatments.
While somatic mutations in the KRAS or BRAF, and rarely ERBB2, genes have been well characterized in SBTs, other genetic alterations have not been described.
Israel's Supreme Court, in response to petitions, has ordered several sections of the barrier route to be moved closer to the 1967 line, but most of the alterations have not yet been carried out.
These alterations had not been tested or formally compared with DeVita's original formula.
Because of the extended larval period in Xenopus, the molecular basis of these alterations has not been well studied.
In some cases, the mechanism responsible for these developmental alterations has not been characterized, and one cannot discriminate cell-autonomous effects in the mammary epithelia versus stromal effects since the mutations were systemic.
However, a correlation of the symptoms with morphological alterations has not yet been determined.
