"investigated topic" is a correct and usable phrase in written English.
It can be used when discussing a specific subject that has been researched or studied. Example: The results of the study on the investigated topic of renewable energy were presented at the conference.
As mentioned above, cytosolic sensing of PAMPs especially pathogenic DNAs is an intensely investigated topic.
Within other disciplines, for instance STS and TA, public engagement (PE) with science and technology is a well investigated topic.
Most abundantly investigated topic is the transport assessment of NPs in a 3D microfluidic organs-on-chips system.
The present study was proposed for a specific clinical area (lumbar arthrodesis) in order to overcome the lack of literature evidence with regard to the investigated topic.
Resource auto-scaling for the purpose of preventing resource over-provisioning or under-provisioning is a widely investigated topic in cloud environments.
Similarly, the use of flywheels for on-board ESSs is becoming a more widely investigated topic, but a prototype, developed in Rotterdam for their tram system, caused significant damage when it became detached from the tram during testing in the workshop.
Furthermore, one of the least investigated topics is the belowground living wood component of riparian trees.
Stereo vision has traditionally been and continues to be one of the most extensively investigated topics in computer vision.
Past research teams have investigated topics such as: sustainable energy, temporary worker mobility, non-tariff barriers to trade, and rules of origin regimes.
With regard to corporate income taxation, the investigated topics include the consequences on compensation contracts, tax avoidance (and tax evasion), investment and capital structure, and transfer pricing.
The use of membrane contactors for post-combustion CO2 capture by absorption into a chemical solvent is currently one of the most intensively investigated topics in membrane science.
