The phrase "also demonstrated that certain" is correct and usable in written English.
You can use it when discussing findings or evidence that support a particular claim or argument, often in academic or formal writing.
Example: "The research also demonstrated that certain factors significantly influence consumer behavior."
Alternatives: "also showed that specific" or "further indicated that particular".
It is also demonstrated that certain specific partitionings of the classifier observation space effectively lead to the highest rank, Borda count and logistic regression rank-based decision combination methods from the literature.
Studies also demonstrated that certain cancer cells can synthesize elastin and express lysyl oxydase, providing explanation for frequent appearance of elastic tissue in tumors such as breast or gastric cancers.
However, it was also demonstrated that certain miRNAs are species-specific [ 18].
Conversely, we also demonstrated that certain disease classes with many genes of early metazoan origins are under particularly strong rates of purifying selection within mammalian lineages.
Recent reports have also demonstrated that certain human matrix metalloproteinases (MMP-3, MMP-7, MMP-9, MMP-12 and MMP-13) can catalyze a single-strand cleavage of human IgG1 antibodies in the lower hinge region in vitro [ 15, 18], although the rate of cleavage varies among the different MMPs.
Moreover the results of this study also demonstrate that certain general practitioner attitudes predict patient-rated quality of care provided by the practice.
It is also demonstrated that, under optimal design and certain loading circumstances, LVL shows a higher shear buckling capacity compared to a similar plywood sheathing.
It is also demonstrated that the MUD-MAC protocol provides certain fairness among network nodes with different signal processing capabilities.
It was also demonstrated that these cereals are deficient in certain essential amino acids, especially lysine and tryptophan, which are very important for the hens to grow healthily.
Although most of the resistance mechanisms involved single gene events, we also demonstrated that pathways are readily identifiable for certain drug resistance phenotypes; for example, bactobolin resistance was shown to be a consequence of mutations in endocytosis genes.
It is also demonstrated that exchanging the native carbonate ions for certain organic species which act as complexing agents for copper ions, gives rise to an equivalent level of FFC inhibition.
