The phrase "also observed that several" is correct and usable in written English.
It can be used when discussing findings or conclusions drawn from observations in research or analysis.
Example: "The researchers also observed that several participants showed significant improvement over the course of the study."
Alternatives: "also noted that several" or "also found that several".
We also observed that several of the genomic sequences reported high levels of expression, highlighting the limitations of expression analysis based on ESTs alone.
Lawyers for the plaintiffs also observed that several witnesses testified about being stopped more than once, underscoring the personal toll inflicted as a result of the police practice.
R.C. MacLeod also observed that several tears in the flag had been carefully mended.
We have also observed that several positions appear to be instable (with heteroplasmic-like patterns) in forward but not in reverse sequence electropherograms or vice versa.
We also observed that several different small RNAs originated from the same miRNA precursors.
We also observed that several patient characteristics were associated with increased risk of air pollution.
We also observe that several MRI biomarkers provide significant information for predicting MMSE scores for the first 2 years, however very few are shown to be significant in predicting MMSE score at later stages.
We also observe that several genes known to be related to MetS show differential epigenetic response to age in individuals with and without MetS.
Moreover, it is also observed that the several equations proposed by structural codes underestimate the punching shear capacities of the test specimens.
Interestingly, we also observed that on several occasions a new kind of US-CS association trajectories appeared.
We also observed that circuits containing several tuned variants appeared to be sensitive to the level of EnvZ-V5 present under the low osmolarity regime.
