The phrase "activated in the first" is not entirely clear without context, but it is grammatically correct and can be used in written English.
You can use it when referring to something that has been initiated or turned on in a primary or initial phase or instance.
Example: "The system was activated in the first stage of the process to ensure all components were functioning properly."
Alternatives: "triggered in the initial" or "enabled in the first phase".
More than 3,600 nonresidential systems were activated in the first half of 2012, bringing the number of individual solar electric systems to 24,000, the report said.
In later stages, the signal transduction pathways activated in the first phase trigger the production of different proteins and compounds that restore or achieve a new state of homeostasis.
Similar to the previous strategy, but methods are enabled in different order, i.e., PTS is activated in the first half of the simulation and MTSC in the second half.
These modes are chosen in such a way that they cannot be separated by the Fourier transform (Figure 3) and they are not initially in the dictionary Φ. Figure 3a shows the spectrum of each sinusoid activated in the first level.
AT&T said 146,000 accounts were activated in the first two days of sales — which were the last two days of the second quarter — and that number is significantly below the 500,000 that were thought to have been sold in the phone's debut.
It was indicated that primary metabolism is activated in the first rapid growth phase (phase A), and secondary metabolism is induced when the growth is slowed down (phase B).
Next, we explored the possibility that transcription factors activated in the second wave might regulate the expression of genes activated in the third wave.
We conclude that some genes in the third wave are downstream targets of transcription factors that are activated in the second wave.
This is consistent with the idea that these genes are being transcriptionally activated, in the third wave, by Mixer and Brachyury, respectively.
We show that polyadenylation of maternal mRNAs is required for the establishment of normal levels of zygotic transcription, and for two transcription factors activated at the MBT we identify downstream target genes that are activated in the second wave of zygotic transcription.
Experimental analysis indicates that the polyadenylation of maternal transcripts is necessary for the establishment of proper levels of zygotic transcription at the MBT, and that genes activated in the second wave of expression, including Brachyury and Mixer, contribute to the regulation of genes expressed in the third.
