The phrase "and therefore effective" is correct and usable in written English.
It can be used to indicate that something is effective as a result of a previously mentioned reason or condition.
Example: "The new marketing strategy has increased our sales significantly, and therefore effective in reaching our target audience."
Alternatives: "and thus efficient" or "and consequently successful".
No two areas face the same air quality circumstances and, therefore, effective strategies and programs will differ among areas.
The fluorocarbon coating, as expected, reduces bond formation, and therefore, effective as an inert layer to passivate nanomaterials.
In the light of that decision, the important thing is that we make it very clear when content is paid for, and I think the new labelling is unambiguous and therefore effective.
This infectious disease results in significant losses in the farming industry and therefore effective therapeutic agents are needed to control outbreaks caused by this pathogen.
He added, "Scientists will be able to get at a faster understanding of the disease in general, and therefore effective treatments, by knowing more about who's at risk and who's not".
Host cells produce cytokines and chemokines in response to viral infection, and among such effector molecules, type I interferons are the principal antiviral cytokines and therefore effective targets for viruses to disarm host surveillance.
It also contains salicylic acid, which is used to make aspirin, and is therefore effective in the treatment of headaches, migraine and insomnia.
On effectiveness: UNICEF gets results from its upstream work, and is therefore effective to a degree.
Gray, known for his prosecutorial (and often, therefore, effective) approach to interviewing, turned solicitous, as if he were trying to comfort the winner.
In a global perspective, bacterial infections are still a major cause of morbidity and mortality; therefore, effective antibiotics are needed.
These results indicate that FMDs induced apoptosis in the tumor and are therefore effective anticancer agents.
