The phrase "a number of structures" is correct and usable in written English.
It can be used when referring to multiple structures, often in a context related to architecture, biology, or any field where structures are relevant.
Example: "The research team discovered a number of structures that had previously gone unnoticed in the ancient ruins."
Alternatives: "several structures" or "multiple structures".
In a 1999 review of 8 longitudinal MRI studies of brain structural changes in SZ (which included a number of structures as well as ventricle size), DeLisi [ 6] was only able to conclude that changes in such variables appear greater across the life span in subjects with SZ compared to controls, but the specifics are highly variable.
Alternatively, from the analysis of a number of structures sharing some property, it is possible to derive a structural template encoding the function-determining residues, and use that to screen the proteins of interest.
In the human embryo, for example, a number of structures are transient and at birth have already undergone atrophy.
The Purisima Formation displays a number of structures that formed in response to uplift, such as jointing and fracturing.
The Environment Agency has … reduced the extent of their watercourse channel maintenance and taken steps to stop operating a number of structures and systems.
"In the last 20-30 years our neighbouring countries have built a number of structures for collecting water or diverting water for their agricultural lands," Dr Rashid said.
A number of structures of cap1 MTases from flaviviruses were determined with various cap analogues, revealing the structure of the cap-binding pocket14,15.
A number of structures have been found to be dynamically responsive only after construction, resulting in costly repairs.
There has been an increasing tendency to undertake vertical extensions in a number of structures being renovated or improved.
JERUSALEM — Israeli warplanes struck at least four times across Gaza on Friday, damaging a number of structures that the military said were sites for weapons manufacturing or storage.
My understanding is that a number of structures of the Provisional IRA still exist but there is no evidence it's involved in terrorism or paramilitary activity".
