The phrase "are characterized either by" is correct and usable in written English.
You can use it when describing the distinguishing features or qualities of two or more subjects or categories.
Example: "The two species are characterized either by their size or by their coloration."
Alternatives: "are defined either by" or "are distinguished either by".
The anomalous dependences are characterized either by deviation from linearity or by lesser slopes than those determined from Levich's equation.
A leading thinker in the field of water issues, Dr. Zeitoun helped pioneer a way of analyzing international water tensions, departing from the idea that water struggles are characterized either by peaceful cooperation or armed conflict.
The tests showed that the failure modes are characterized either by the formation of plastic hinges in the linear part or by local instability in the sinusoidal parts of the opening quarter similarly to those observed on the corresponding whole beams.
Therefore, the superhard coatings with a hardness of H>40 GPa are characterized either by the strong reflection from large (20 50 nm) ZrNx grains with a preferential orientation or by many weak reflections from small, approximately 10 nm, ZrNx grains.
These pathogens can cause rapid, systemic and often fatal illnesses which are characterized either by a fulminant pneumonia and multi-organ failure or by a severe hemorrhagic fever [6] [9].
The diseases are characterized either by tissue destruction or by tissue hyperplasia.
It has been characterized either by the arcane -- the Confederate flag and Bob Jones -- or by the evergreens -- Social Security, campaign finance reform, abortion and gun control.
Numerous studies show that patterns of rearfoot inversion/eversion cannot be characterized either by foot type or by orthotics use.
Regions that experienced low/moderate plastic strain retained the as-received powder microstructure while regions that experienced significant plastic strain were characterized either by a featureless microstructure (atomized coatings) or the presence of fine, elongated beta precipitates (hydride de-hydride coatings).
This general structure is observed for all genetic markers studied so far and is characterized either by sharp differences of gene frequencies or by the occurrence of distinct genetic lineages.
It is characterized either by the absolute absence of any cervical tissue or by the presence of severely defected cervical tissue such as cervical cord, cervical obstruction and cervical fragmentation.
