"is essentially constituted" is perfectly correct and usable in written English.
You can use it when you are describing something that is made up of, or otherwise composed of, various parts. For example, "The legal system of the United States is essentially constituted by laws and rulings at both the federal and state levels."
A) Control implant without any factor is essentially constituted of fibroadipose tissue with small areas of bone (arrows).
It is essentially constituted by three electrodes: a platinum cathode, an anode that supports our samples, and a reference electrode.
An ethical problem is essentially constituted by disagreement or uncertainty in attitude, though it is often constituted by disagreement or uncertainty in belief as well.
The identity of a living thing is essentially constituted by its relations to other things in the world, especially its ecological relations to other living things.
By private language, Wittgenstein means a language with words whose meaning is essentially constituted by and for the inner experience or individual consciousness of a subject.
So while Spinoza does not accord to the people a proper right of revolution, he proposes a naturalistic equivalent, since the right of the state is essentially constituted, and limited, by the power of the people (TP 2/17) (see Sharp 2013).
She never said, 'This is very cheap, let me buy a dozen.' " ONCE HER COLLECTION was essentially constituted, Cisneros — who has homes in Venezuela, New York and the Dominican Republic — toured portions of it in well-thought-out exhibitions that were supported by scholarly catalogs.
Honeycomb structures are essentially constituted of a repetition of regularly-arranged and loaded sub-structures.
Stevenson holds that moral judgments or thoughts are essentially constituted at least in part by affective attitudes, feelings, or interests, those mental states whose general character is to be for or against something.
For a purpose to be manner specific, according to Mag Uidhir, is for it to be essentially constituted both by an action (or state of affairs) and a manner, such that the purpose is to perform that action (or bring about that state of affairs) in that particular manner.
These PEAs are essentially constituted of six types of structural entities, i.e. isophthalic, terephthalic, 2,6-naphthalic and 4,4′-biphenyl moieties containing dicarboxylic acid and the aliphatic, aromatic (phenylene and xylylene moieties) of the di-amide linkage of the amido diol part.
