The phrase "ascertained directly from" is correct and usable in written English.
It can be used when indicating that information or data is obtained in a straightforward manner from a specific source.
Example: "The results of the study were ascertained directly from the participants' responses."
Alternatives: "determined straight from" or "obtained directly from".
Maternal age, parity, gestational age, smoking quantity and year of delivery will be ascertained directly from the midwifery records.
Hence, the sample was not population based, so we cannot necessarily generalize our results to ET cases ascertained directly from the population of Mersin.
Residue-specific R1 and R1ρ values were obtained from fits of peak intensities vs relaxation time to a single exponential decay function, while NOE ratios were ascertained directly from intensities in experiments recorded with (5 s relaxation delay followed by 7 s saturation) and without (relaxation delay of 12 s) saturation.
The purpose of this study is to ascertain directly whether cells labeled in the subcortical telencephalon in vivo differentiate into mature cortical interneurons and whether any cortical interneurons arise from the dorsal, cortical neuroepithelium.
To ascertain directly whether AAMs associate preferentially with sites that experience low rates of evolutionary change, we utilized an approach similar to the site analysis used above together with codon evolutionary rate obtained from CODEML in PAML [ 23].
This additional degree of freedom, which cannot be directly ascertained from experimental peptide binding data, makes epitope prediction for class II MHC more difficult than for class I MHC.
Details of self-reported ethnic origin and age were directly ascertained from the patients and recorded.
We did not directly ascertain from our participants whether they felt pressure to prescribe antibiotics for mild infections, however, participants reported using antibiotics frequently and substantially increasing the number of cultures they performed.
While the temporal reliability of the VOC concentrations could not be directly ascertained here, the parental responses from the two rounds of questionnaires suggest that the home indoor environment has not changed between the baseline and the present investigation.
Unlike those studies, which ascertained epilepsy from computerized hospitalization records, we used diagnoses reported directly to physicians, which should be less likely to include false-positive diagnoses [ 32].
