The phrase "a sample was extracted" is correct and usable in written English.
It can be used in contexts such as scientific research, data analysis, or any situation where a sample is taken from a larger group for examination or testing.
Example: "In the study, a sample was extracted from the population to analyze the effects of the new drug."
Alternatives: "a sample was taken" or "a sample was collected."
After stirring, a sample was extracted and placed into a test tube vial.
As shown in Fig. 4c, a sample was extracted from this shaded part of a leaf.
A sample was extracted in cyclohexane (4 mL samples: 4 mL cyclohexane).
From the participants in the CCAF study, a sample was extracted to study fluid intake in several age groups.
In order to avoid problem with sampling from these imperfect registries, a sample was extracted instead from the appointment books of patients attending in the three month period prior to the audit.
After 3 hr, a sample was extracted (t = 0) and nocodazole was washed out by filtering in the presence of methionine and cultures were released into YPDA + Met to allow spindles to reform while maintaining the metaphase arrest.
In contrast, shotgun metagenomics, where all DNA from a sample is extracted and sequenced, provides a culture-independent and explorative alternative to characterize the genetic basis for resistance within microbial communities.
Similar location information for introns identified by alignment of RNAseq data, for the poly(A) samples, was extracted and the two datasets were compared to identify introns validated by RNAseq.
A DNA sample was extracted from PBMCs using a NucleoSpin RNA/DNA Buffer Set (MACHEREY-NAGEL, Germany) according to the manufacturer's protocol.
A tiny sample was extracted and analysed by FTIR microspectroscopy (not shown) to test for the presence of any red or orange synthetic organic pigment.
A DNA sample was extracted from the surface of the anode graphite felt piece (1 × 2 cm) after MFC operation using an ISOPLANT II kit (NIPPON GENE, Tokyo, Japan) according to the manufacturer's instructions.
