The phrase "alteration of existing" is correct and usable in written English.
It can be used when discussing changes or modifications made to something that is already in place or established.
Example: "The alteration of existing policies is necessary to adapt to the new regulations."
Alternatives: "modification of current" or "change to existing".
The government would have to finance the research and the alteration of existing jet planes.
Indeed, the manner in which the expansion is structured indicates that while Congress may have styled the expansion a mere alteration of existing Medicaid, it recognized it was enlisting the states in a new healthcare program," the ruling said.
This compiled information may serve as a benchmark for the alteration of existing ligands to design novel potent molecules with lesser side effects.
The current findings are a promising advance in the engineering of novel biomaterials and the alteration of existing tissues for medical use.
The structure based SAR of TZD derivatives for various protein targets would serve as a benchmark for the alteration of existing ligands to design new ones with better binding interactions.
Our focus on these microorganisms centers on the optimal production of higher-order biofuels using the construction of novel metabolic pathways and/or the alteration of existing pathways as well as examples of their application in recent years.
The preservation board oversees modifications of landscapes, construction of new buildings, alterations of existing buildings that would change the footprint, installation of fencing and removal of trees taller than 8 feet.
A number of alterations of existing contraceptive methods are being studied, including a better female condom, an improved diaphragm, a patch containing only progestin, and a vaginal ring containing long-acting progesterone.
This can range from alterations of existing behavioral traits to the expression of novel behaviors not present in the normal repertoire [ 1– 3].
On the contrary, it appears that the maintenance of the symbiosis is modulated by the alteration of expression of existing genes involved in vital cellular processes.
