The phrase "and comparative levels of" is correct and usable in written English.
It can be used when discussing or analyzing different degrees or amounts of something in a comparative context.
Example: "The study examined the effectiveness of various teaching methods and comparative levels of student engagement."
Alternatives: "and relative amounts of" or "and differing degrees of".
27– 30 There is strong evidence to suggest that South Asians are more insulin resistant than Caucasians, even at younger ages and comparative levels of BMI.
Ethidium fluorescence was examined and imaged by fluorescence confocal microscopy (Carl Zeiss, Oberkochen, Germany), and comparative levels of fluorescence were analysed using ImageJ software [National Institutes of Health (NIH), Bethesda, MD, USA].
If you were in a mind to be critical, you could say that the ratio of new material to clips, and the comparative levels of invention for each, were quite low.
Thus the toxic response to multiple exposures varies depending upon the time sequence and the comparative levels of the individual components.
As in: Let U, C, I, S, and F be integers between 1 and 9, reflecting, respectively, comparative levels of Urgency, Complexity, Importance, Skill, and Frequency in a given set of circumstances.
Norton and Cabernet Sauvignon have comparative levels of catechin at 17 DAB.
Interestingly, the comparative levels of Oct4, Sox2 and Rex1 expression in MES12 and MES29 are reciprocal to Cer1 and Otx2.
Comparative levels of tumour and plasma C16-DHceramide followed the same pattern as C16-ceramide.
Since L-LECs expressed the highest comparative levels of Robo4 and the lowest comparative levels of Robo1, we focused on the potential effects of Robo4 on Slit2N-mediated inhibition of VEGF-C/VEGFR-3 signaling in these cells.
Deconvolution of the emission spectra of both assemblies revealed comparative levels of PB and YO emision, therefore we surmise that the enhancement of Cy3 emission observed for 2@DNA21 is attributed to PA 2 augmenting efficient energy transport at the second energy transport step (i.e. from YO to Cy3) rather than exhibiting a major effect on the first energy transport step (i.e. from PB to YO).
To estimate the comparative levels of GABA A α1 and β3 subunits expression, all immunoreactivities were normalized to β-actin expression before statistical analysis.
