The phrase "at this time therefore" is correct and usable in written English.
It can be used to indicate a conclusion or decision based on the current circumstances or context.
Example: "At this time therefore, we have decided to postpone the meeting until next week."
Alternatives: "currently, thus" or "at this moment, hence".
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River water was not available at PNNL at this time; therefore, eggs were gradually acclimated (i.e., ∼2°C/h) to (mean±SE) 7.9±0.1°C well water over a several hour period.
At this time, therefore, these ants were not infected, but were infectious, as they carried viable Metarhizium conidia that could potentially infect other ants on their cuticles.
It would not seem feasible at this time, therefore, to attempt to identify patients who may benefit from the IRI-S, using clinicopathologic factors that are easily accessible.
That the extent of the outbreak at the referring institution was larger than originally appreciated became apparent at this time; therefore, the patient was transferred to another facility for placement in negative pressure isolation for possible exposure to SARS.
They need to be kept in an environment of at least 90 degrees during this time; therefore, a heat source may be required even in the summer.
At the time, therefore, Carson's work was beyond the scope of contemporary scientific concerns.
The literature popular at the time, therefore, largely governed the subject matter of Herāt school paintings.
Russian print media at the time therefore emphasized Russian ties with Korean and Chinese peasants more than it emphasized any ties between Russia and Japan.
Light beats and cheerful melodies were in vogue at the time; therefore the two used a lighter style.
