The phrase "a supplemental level" is correct and usable in written English.
It can be used when referring to an additional or extra tier, stage, or degree in a particular context, such as education, training, or assessment.
Example: "The course offers a supplemental level for students who wish to deepen their understanding of the subject matter."
Alternatives: "an additional tier" or "a supplementary stage".
In complete medium with a low supplemental level of VEGFA (∼2 ng/ml), VEGFA or CRIM1 knockdown HUVECs exhibited slower growth kinetics (Fig. 7A), as shown previously (Fig. 6A).
Duodenal crypt depth decreased (P<0.05) at the supplemental level of 75 mg of XOS kg−1.
Four experimental diets were prepared in a 2×2 factorial arrangement with two supplemental levels of phytase at 0 or 500 phytase units/kg and two supplemental levels of β-mannanase at 0 or 800 units/kg.
Diets were formulated to contain supplemental levels of Zn, Cu, Mn, and Co at four times NRC (1989) recommendations for yearlings in rapid growth.
crops were grown in sheltered field plots for two consecutive seasons under reduced, near-ambient and two supplemental levels of ultraviolet-B radiation (UV-B, 280 315 nm).
Leaf rutin concentration and the amount of UV-B absorbing compounds were increased by UV-B with the exception of the 8.50 kJ m−2 day−1 supplemental levels.
Branches of mature trees of sweet gum (Liquidambar styraciflua), tulip poplar (Liriodendron tulipifera) and red maple (Acer rubrum) were exposed to supplemental levels of UV-B radiation over three growing seasons.
Cows were assigned to treatments in a randomized complete block design to receive an oral bolus with a mix of INO (n = 21) or organic AA complexes (AAC; n = 16) of Zn, Mn, Cu, and Co to achieve supplemental levels of 75, 65, 11, and 1 mg/kg, respectively, in the total diet DM.
Secondly, we deepened the anesthesia level with a supplemental intravenous anesthetic.
To evaluate postoperative pain level using a supplemental peribulbar injection at the conclusion of retinal surgery.
