The phrase "alterations were studied" is correct and usable in written English.
It can be used in contexts where research or analysis of changes or modifications is being discussed.
Example: "In the research paper, the authors concluded that the alterations were studied thoroughly to understand their impact on the overall system."
Alternatives: "modifications were analyzed" or "changes were examined".
Exposure to BPA and possible methylation alterations were studied with genome-wide approaches.
Alterations were studied according to other known mutations (EGFR, ERBB2, BRAF, KRAS, TP53 and STK11).
Type and extent of endocrinological alterations were studied in long-term disease-free survivors after cisplatin-based chemotherapy for testicular cancer.
SG2000-induced cell cycle alterations were studied for up to 72 h following a 1 h treatment at equi-toxic (GI50) doses in four canine melanoma cell lines (CMeC-1, CMeC-2, KMeC and LMeC).
Natural combustion alteration was studied in siliceous mudstone of the Miocene Sisquoc Formation at Orcutt oil field, California, where centers of most intense combustion alteration are composed of 1 2 m thick tabular zones of brecciated clinker.
Wettability alteration was studied also with the carbonated version of the brines for both limestone and dolomite samples.
Aging-related ultrastructural alterations in mitochondria were studied in all animals by transmission electron microscopy.
Alterations in glycocalyx were studied using digoxigenin-labelled lectin maackia amurensis agglutinin (MMA) (to identify sialic acids, a large family of nine-carboxylated sugars present on the cell surface) and mouse monoclonal antibody against Syndecan-1 (an integral membrane proteoglycan).
Histopathological alterations in buccal pouches were studied by light microscopy.
Cell cycle alterations induced by treatments were studied by flow cytometry analysis.
Parallel to the NMR experiments, the cytokinetic and histological alterations in the tumours were studied under the same experimental conditions.
