The phrase "and even constant" is correct and usable in written English.
It can be used to emphasize that something is not only present but also remains unchanged or stable over time.
Example: "The temperature in the room was high, and even constant, making it uncomfortable for everyone."
Alternatives: "and consistently stable" or "and reliably steady".
Comparable "emergent effects" of cumulative, collective behavior have been observed in other sectors, such as the rejection of E10 biofuel in Germany,12 sudden investment withdrawals in the financial sector [65], and periodic, or even constant, distrust in the food sector, as with Enterohaemorrhagic Escherichia Coli bacteria (EHEC) in Europe [66] or milk powder in China.13.13
The results of the series of investigations have revealed that the processes involved in corrosion inhibition are not uniform with respect to all classes of compounds so far investigated and are not even constant or consistent with one inhibitor in a given system.
It is unique, however, because it made devequt, "being-with-God," an object of aspiration and even a constant duty for all Jews and in all circumstances of life, even those seemingly most profane.
Turbulence intensities below 0.7% are obtained for the whole range of velocities available in the wind tunnel, and even practically constant uniform flow is obtained for all the traverses tested for validation.
But the real reason to go beyond conventional broadcast media, and even beyond constant engagement to the Holy Grail of community, is to create commitment in an environment that predisposes people to capriciousness.
And yet I seem to lose my way at regular or even constant intervals.
These are even constant within a supra-specific taxon, which facilitates comparisons.
Still, the retired general shows no signs of wanting to slow down and even wears his constant campaigning as a kind of macho badge.
Images permeate most events in our lives today, from the cameras that track us walking down the street, to the number of photos we take on vacation, and even to the constant supply of celebrity images we see every day.
The latter studies are elegant examples of the capability of MR to measure non-invasively the concentration of metabolites and even the rate constant of enzyme turnover.
