The phrase "activated during the first" is correct and usable in written English.
It can be used in contexts where you are discussing a process or event that begins or is initiated at the start of a particular timeframe or phase.
Example: "The system is activated during the first phase of the project to ensure all components are functioning properly."
Alternatives: "triggered at the outset" or "initiated in the beginning".
A plethora of global gene expression analyses has revealed dramatic changes in transcription following injury and enabled the identification and classification of hundreds of genes that are activated during the first few hours after tissue amputation in several regeneration model systems4,6,7,8,9.
NMD is activated during the first round of translation by PTCs placed at>50 55 nucleotides from the last exon exon junction that is marked, after splicing, with an exon junction complex (EJC) that interacts with the termination factors [44] [46].
The hypothalamic pituitary gonadal axis is transiently activated during the first months of postnatal life.
It was believed that macroautophagy was activated during the first hours of serum deprivation but then gradually returned to basal levels.
We discuss a model of how LBP and CD14 might be involved in the clearance of the gland and how neutrophils and macrophages could be activated during the first 4 days of involution.
The contralateral middle insular cortex has intrinsic connections to the basal ganglia, and a meta-analysis of neuroimaging studies shows that it is most consistently activated during the first-hand experience of pain [48] – suggesting a specific role in coding the sensory-motor aspects associated with pain.
Genes activated during the third wave encoded receptors, metabolism and signalling pathways specific to neural cells.
With the ookinete having to battle against digestive forces of the midgut, which activate during the first 24 h (Gass and Yeates, 1979) such a delay would not be trivial.
Roughly thirteen years later, work on GLaDOS was completed and the untested AI was activated during the company's first ever bring-your-daughter-to-work day in May 2000.
As we can see, the hippocampus, an area that is well known to be implicated in spatial memory, is activated during the learning task the first day of training.
Notably, the hippocampus might reflect memory-related processes activated during both the first-hand and the vicarious perception of pain [3], [51].
