The phrase "a persistent improvement of" is correct and usable in written English.
It can be used when discussing ongoing progress or enhancement in a particular area or aspect.
Example: "The company has seen a persistent improvement of its customer service ratings over the past year."
Alternatives: "a continuous enhancement of" or "an ongoing advancement of".
In a pooled analysis of those patients who continued treatment for an additional 3 cycles (ie, 52 weeks), a persistent improvement in the number of headache days and quality of life was observed with onabotulinumtoxinA [25].
Along with the remission of cancer after subsequent cycles of effective chemotherapy, a rapid and persistent improvement of clinical abnormalities was achieved, which finally enabled us to make a diagnosis of PNS that resemble AOSD.
Thus an intervention that achieves persistent improvement of endogenous insulin production would be expected to improve management and reduce long-term complications.
Such inflammatory response may contribute to the loss of grafted cells that however contrasts with early and persistent improvement of motor functional recovery induced by transplantation of Ngn2-hENPs.
Hence, rapid and persistent improvement of dyspnoea and congestion with no untoward effects on outcomes remains an important and unmet goal of AHF therapy.
The daily decremental PEEP titration after ARM did not show the persistent improvement of oxygenation, the respiratory mechanics and the mortality rate of patients with ARDS compared with the table-based PEEP setting.
These considerations may explain the marked and persistent improvement of the motor performance observed in Cox15 sm/sm ::Opa1 tg double mutants and suggest that OXPHOS impairment due to decreased, but not abolished, function of the mutant gene product is amenable to correction by potentiating the effects of OPA1 on mitochondrial cristae shape and MRC function.
But at the same time, Mr. Obama's notion of persistent improvement, both of himself and of his country, reflects something newer — the collaborative, decentralized principles behind Net projects like Wikipedia and the "free and open-source software" movement.
