"then effective" is a correct and usable phrase in written English.
You can use it to draw a connection between two things or clauses in a sentence. For example: "The new safety regulations were rigidly enforced, then effective immediately, a stringent testing program was put in place."
Presumably, if we could understand what factors can effectively regulate AFC in ALI, either endogenously or exogenously, then effective therapies could be designed to increase AFC in ALI.
As the biomass concentration increased from day 4 to day 10, the light could only effectively penetrate 45.5% of the open-pond depth, and then effective light penetration gradually decreased to 31.1% at day 31, when the biomass density reached a maximum value of 0.45 g L−1 or 90 g m−2.
Is Propecia, then, effective?
Then, effective moduli for plates with the three sizes of cracks are calculated.
Then effective genetic engineering could be performed to promote gene resources application, including plant breeding in high-salt soil.
Atiyah Abd al-Rahman, another Libyan, had been acting as his chief of staff and then effective deputy to Ayman al-Zawahiri, Bin Laden's successor.
Because Terrazas's father was Mexican and because Mexico's then-effective citizenship laws followed the principle of ius sanguinis, Terrazas held Mexican citizenship at birth, and because he was born in the United States, Terrazas also held U.S. citizenship under the ius soli of the Fourteenth Amendment; therefore, Terrazas was a dual citizen of the United States and Mexico at birth.
Is Propecia, then, not effective?
Then, the effective destroying of viruses and bacteria becomes possible.
By then, an effective cocktail of AIDS drugs had been available for almost three years.
It makes sense, then, that effective solutions will be devised and implemented at the local level.
