The phrase "are less functional than" is correct and usable in written English.
It can be used when comparing the functionality of two or more items, indicating that one has a lower level of functionality compared to another.
Example: "The new software features are less functional than the previous version, leading to user frustration."
Alternatives: "are not as effective as" or "have lower functionality than".
It was concluded that pores in Bt horizons with cohesive character are less functional than those in Bt horizons without cohesive character, with lower permeability to air, length and connection between them.
All of the tech shows are bought in from the US, but are less functional than the original sites.
This set of data indicate that degradative AVs are formed in Bcl-xLG138A but further experiments are needed to explain why these AVs are less functional than in Bcl-xL expressing cells.
Ellison et al. (2008) found that OXPHOS complexes in Nasonia hybrids are less functional than those of pure species.
Because flowers from cals5 plants consistently produce pollen with exine defects, it is unlikely that this distorted segregation pattern reflects incomplete penetrance; rather, cals5 haploid cells are less functional than wild type.
Analyses of both molecular sequence evolution and expression patterns did not support the hypothesis that unique alleles probably located on non-recombining chromosomes are less functional than duplicate alleles presumably located on recombining chromosomes.
Because your umbrella is less functional than it should be, drizzle soaks the bottom of your trousers and a half-pint of rain finds its way into your shoes.
As cool as it looks, though, it is less functional than a preview last May suggested it would be.
Most of these sperm cells also expressed RFP signals and were detected in the vicinity of the border between the egg and central cells, indicating that GAA is less functional than the other mAtGCS1 constructs which are successful in complementation, such as GHH, GHP and GPP (Figures S1, 4E and 4F).
Whether it is functional or not remains unclear, but it is certain that this region is less functional than the homologous site in mouse and rat.
We found that Exo1-4S∷E was less functional than Exo1 when expressed from the normal locus because cdc13-1 exo1-4S∷E mutants formed larger colonies than cdc13-1 EXO1 stratns at 26 and 26.5°C.
