The phrase "a portion of tissue" is correct and usable in written English.
It can be used in medical or biological contexts to refer to a specific segment or piece of tissue from an organism.
Example: "The surgeon examined a portion of tissue to determine if it was cancerous."
Alternatives: "a sample of tissue" or "a fragment of tissue."
If a portion of tissue is sufficiently depolarized to form an action potential it may propagate throughout the tissue from these regions.
A portion of tissue was processed for Western blotting and another portion was fixed in Histochoice tissue fixative (Amresco, USA) for histopathological evaluations.
It represents a "new way" of palpation, where a portion of tissue is compressed and the degree to which it displaces is assessed.
For ATP determination, a portion of tissue was homogenised in tris-EDTA buffer, pH 7.75, containing 0.3% trichloroacetic acid, and centrifuged (3000 g, for 10 minutes).
A portion of tissue was placed in saline and brought afresh to pathology and a portion was placed in formalin for standard processing.
For each sample set that included viable tissues, we cultured a portion of tissue under conditions that favored growth of endothelial cells to derive cultured cell lines from tumors or low passage cultures from the splenic hematomas [ 18, 23, 36].
Next, we manually selected tissue-specific CNVs and cn-LOH regions that appeared only in a portion of tissues from the same individual.
Total soluble protein was extracted from the ground frozen tissue by suspending a portion of the tissue in 200 μL of protein extraction buffer plus PI.
Twelve patients had both cancer and adjacent tissue sufficiently large so that a portion of the tissue was immediately frozen in liquid nitrogen and then stored at -80°C for RNA/protein analysis.
Afterwards, a portion of gastric tissue was collected for histopathological analysis and the remained tissue was homogenized in 9 volumes of 0.1 mol/L potassium phosphate buffer (pH 7.4) using a Polytron mixer (Kinematica AG, Switzerland).
Intraoperative tissue biopsy was taken for histopathological studies; a portion of the tissue was fixed in 10 per cent formalin; routine processing was done as per standard operative procedures and stained with haemotoxylin and eosin.
