The phrase "a major agent and" is correct and usable in written English.
It can be used when discussing the role or influence of a significant factor or entity in a particular context.
Example: "In the fight against climate change, renewable energy sources are a major agent and catalyst for sustainable development."
Alternatives: "a key player and" or "a significant contributor and".
Phytochelatins are widely accepted as a major agent of plant detoxification and tolerance to Cd stress [ 7] and a lack of PC synthase activity resulted in an increased sensitivity to Cd [ 29].
Taken together, these observations indicate that AdVs is still a major agent of severe pneumonia and it plays an important role in lethal severe pneumonia in Guangzhou area.
However, behavior often shows large phenotypic variation and flexibility, and can be both – subject to selection and a major agent of selection.
In all subhabitats biological sound daily dynamics are a major agent of change, especially in the evening, when fish sounds overwhelm spectra in marine and transition zones.
Gentamicin is a major agent used to treat severe purulent infection, especially that caused by a resistant gram-negative flora.
Approximately 50% of carbon used in steelmaking leaves the plant as carbon monoxide, which is then combusted to form CO2, a major agent in causing climate change.
This would strongly evidence that this process is a major agent shaping the intra-population variance of the mouse mandible.
The tri-peptide glutathione (L-γ-glutamylcysteinylglycine; GSH) is a major reducing agent and acts as a detoxifying compound through non-enzymatic deactivation of ROS and the action of glutathione-S-transferase enzymes [46].
One of the endogenous free radical scavenger systems is associated with glutathione (GSH), the most abundant nonprotein thiol in mammalian cells, acting as a major reducing agent and in antioxidant defense by maintaining a tight control over redox status.
