The phrase "ascertain directly" is correct and usable in written English.
It can be used when you want to emphasize the act of finding out or determining something in a straightforward manner without intermediaries.
Example: "To resolve the issue, we need to ascertain directly whether the information provided is accurate."
Alternatives: "determine directly" or "find out directly".
A dimensional analysis was carried out to ascertain directly the maximum tunnel displacement, bending moment, and shear force.
Although we were not able to ascertain directly which aspects of the course contributed most to these improvements, we suspect that it was a combination of effects.
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].
Owing to the lack of information on illness severity in these data, we cannot ascertain directly if less severely ill patients are being hospitalised over time, or whether hospital treatment has helped reduce mortality in the 28 days after admission.
Our study was limited by the inability to ascertain directly whether any of the reported fetal deaths actually showed signs of life that would have met the WHO definition of live birth.
To ascertain directly if WAY-196025 inhibits cPLA2ζ (PLA2G4F), Cos-M6 cells were transfected with pCMV6-XL6-cPLA2ζ (Origene ACC NM_213600), cleared lysates were harvested and assayed using 1-palmitoyl-2-[C]arachidonyl sn-glycerophosphatidylcholine (PAPC) liposomes as described previously for cPLA2β [ 40].
The effect of store depletion was ascertained directly by following exposure to the sesquiterpene sarcoplasmic-endoplasmic Ca2+ ATP-ase (SERCA) antagonist thapsigargin (TG; 1 µM).
However, the roles of these motifs remain to be ascertained directly by biochemical and functional analysis, and it seems premature to assume that all motif copies have the same function.
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.
