The phrase "are characterized by a combination of" is correct and usable in written English.
You can use it to describe the features or qualities that define a particular subject or entity, often in a formal or academic context.
Example: "The species are characterized by a combination of unique physical traits and behavioral patterns that distinguish them from other species."
Alternatives: "are defined by a mix of" or "exhibit a blend of".
Dendrimers are highly defined artificial macromolecules, which are characterized by a combination of a high number of functional groups and a compact molecular structure [17].
Apprenticeship programs within the German dual VET system usually take three years and are characterized by a combination of workplace learning in the training company and classroom-based learning in state-run vocational schools.
Indeed, successful PES are characterized by a combination of good design, implementation, and governance features that include coordination with the private sector, quality assurance and accreditation mechanisms, and solid monitoring and evaluation.
The morphology and composition of the thermally grown oxide (TGO) layer in a thermal barrier system with a NiCoCrAlY bond coat are characterized by a combination of scanning and transmission electron microscopy, focused ion beam sectioning and energy-dispersive spectroscopy (EDS) element mapping.
Habitat types are characterized by a combination of topographic variables and vegetation (Fig. 1 and Table 1).
Networks with small-world architecture are characterized by a combination of strong local clustering and a short characteristic path length (an index of global integration).
Hiberno-Saxon art is characterized by a combination of these two traditions, particularly the Irish curvilinear motifs and elaborated initials and the Saxon zoomorphic interlacings and bright colouring.
All these complexes have been characterized by a combination of analytical, spectroscopic and crystallographic methods.
Soil materials can be characterized by a combination of physical and morphological soil attributes.
This wear is characterized by a combination of delamination, mild abrasion and oxidative wear.
The material has been characterized by a combination of spectroscopic and microscopic techniques.
