The phrase "a useful concentration" is correct and usable in written English.
It can be used when referring to a focused effort or attention that is beneficial in a particular context or situation.
Example: "In our research, we found that a useful concentration on key variables led to more accurate results."
Alternatives: "a beneficial focus" or "a valuable emphasis".
Adaptation is accomplished by infecting a live animal or a flask of cultured cells with a wild-type virus, allowing the virus to replicate until it reaches a useful concentration, harvesting the virus, and then using these progeny virions to initiate another infection in a new animal or culture (Fig. 1a).
The optimal figure is 70% or higher, guaranteeing a useful concentration of antioxidant flavonoids.
Addition of cardiotoxin dissociates cytotoxicity (required for antitumoral activity) and neurotoxicity (otherwise, its main side effect) and allows a useful concentration to be achieved in vivo [ 107].
The aims of the present study were (1) to evaluate the anti-aggregatory effect of Iloprost on feline platelet counts and to determine a useful concentration to inhibit platelet aggregation in EDTA samples from clinically healthy cats, (2) to investigate the effect of Iloprost on hematological blood parameters, and (3) to determine stability of Iloprost in K3-EDTA tubes for up to 16 weeks.
The trapping of the α-OH-PdG and γ-OH-PdG with PFBHA suggests that there is a low but kinetically useful concentration of the ring-opened aldehyde form in equilibrium with the closed-ring form.
The useful concentration of a contrast agent may therefore vary, although nanomolar concentrations are usually required for superparamagnetic iron oxide particles (SPIOs).
Calibration curve was obtained for malathion, with useful concentration range 0 20 μM.
Calibration curve was obtained for l-Asn, with useful concentration range of 0 100 μM for l-Asn.
So far, we have observed no obvious side effects of either long-term auxin exposure within the useful concentration range or from TIR1 expression.
However, suitable targeting and intracellular accumulation strategies are needed to deliver therapeutically useful concentrations of such compounds, which could be achieved using antibodies and nanoparticles.
They favor a warm freshwater pond for the origin of life, as did Darwin, where cycles of wetting and evaporation around the edges could produce useful concentrations and chemical processes.
