The phrase "au standard" is not correct in written English as it is a French expression.
It can be used in contexts where you are referring to something that meets a certain standard, but it should be translated into English.
Example: "The product must be manufactured au standard to ensure quality."
Alternatives: "to standard" or "up to standard".
Fig. 3 The dependences of the SPR position, θ min, on the refractive index of the environment, n, for Au standard sensors with a flat surface (curve 1 in a c) and Au gratings with period of 296.6 ± 0.5 nm and depth of relief of 13.5 ± 2 nm (curve 2 in a) and 21.0 ± 2 nm (curve 2 in b).
Figure 4a shows the dependences of the SPR curves' minimum position on the refractive index of the investigated solution for the Au standard sensor (curve 1) and the Au gratings with depth of relief of 13.5 ± 2 nm (curve 2) coated with a 4-nm thick chromium layer.
Fig. 4 The dependences of SPR position, θ min, on the refractive index of the environment, n, for Au standard sensor (curve 1) and Au gratings with period of 296.6 ± 0.5 nm and depth of relief of 13.5 ± 2 nm (curve 2) coated with a 4-nm chromium layer: a the plane of incidence of the probing laser beam is parallel to the grating wave vector (the azimuthal angle ϕ = 0), b ϕ = 5.7°, and c ϕ = 10°.
Skin AF is expressed in arbitrary units (AU) and the mean skin AF in this study was 2.27 AU (standard deviation: 0.63).
The flux stability (>99.8%) was tested irradiating Au standards as monitor.
The flux stability (>99.8%) was tested irradiating Au standards as flux monitor; the maximum irradiation temperature in the rotating rack reached 40°C.
Koelmel et al. [ 18] applied AuNP-spiked cellulose pellets as standards, and Wang et al. [ 19] performed quantification by the ablation of droplet residues on glass slides containing Au standards.
At first, 50-nm Au colloids (standard deviation of approximately 5 nm, NanoSeedz, Hong Kong) were drop-casted on SiO2/Si substrates (50-nm thermally grown oxide) to serve as the catalyst, which were then placed in the middle of the downstream zone with a tilt angle of approximately 20°.
The absorbance of individual test samples was converted into arbitrary antibody units (AU) using a standard curve generated by this standard reference serum.
The sensitivity of the method is characterized by the ratio of Δθ min to Δn. Fig. 2 The dependences of the reflection, R, on the angle of incidence, θ, for the standard Au sensor with flat surface (a) and Au gratings with a period of 296.6 ± 0.5 nm and average depth of relief of 13.5 ± 2 nm (b).
The spectra of the bare gold substrate are quite agreeable with that of standard Au.
