The phrase "are efficient only when" is correct and usable in written English.
It can be used to specify conditions under which something is efficient or effective.
Example: "These systems are efficient only when they are properly maintained and updated regularly."
Alternatives: "are effective solely when" or "function efficiently exclusively when".
We are efficient only when we sleep enough, eat right and exercise.
Moreover, velocity planning algorithms are efficient only when the curvature and derivative of the curvature have the same velocity demand.
Mild vaccine strains are efficient only when chickens have no or very low levels of MDA, while the intermediate strains including D78, and the "hot" strains can break through higher levels of MDA titres [ 25].
Based on these data we suggest that pre and co-seasonal treatment is efficient only when Oralair is prescribed, whereas Grazax should be used in only in an all-year-around manner in order to obtain clinical efficacy.
This process is efficient only when the A/F ratio is at 14.7.
Agrobacterium-mediated transformation was efficient only when scutellum-derived calli were less than 1 mm in diameter, non-friable, whitish and roundly shaped; moreover, such calli had to be used within 10 days after isolation and selection.
We find that pyrophosphorolysis is efficient only when the base-paired primer template region is >14 bases, and that activity increases when the primer end is blunt-ended or recessed by only a few bases.
Previously we noticed that Arb inhibition of primary infection of Huh-7.5.1 cells with HCV (clone JFH-1) was efficient only when cells were preincubated with Arb 24 or 48h before infection [10]; in addition, inhibition of HCVpp and HApp cell entry was most efficient when Arb was pre-incubated with both viral and cell membranes [12].
In light of these results, it can thus be advanced that the aforementioned negative impact of NMD on the immune process developed by the host against MSI tumor cells would be efficient only when NMD factors are over-expressed and highly active in degrading the numerous PTC-mRNAs encoding for immunogenic peptides that are synthesized in MSI CRCs.
Thus, group selection is efficient only when group members are sufficiently related [ 22, 27, 28].
Navigating the data is efficient only when accessing a particular document of a particular patient's record.
