In our case, the estimation of a zero rate of regain of antennal coiling suggests that this trait is under severe constraints and that its loss evolves as an irreversible character, at least over the timescale examined.
Despite the size of Burchfield's Supplements, he was under severe space constraints, constantly fending off demands to cut back from Oxford University Press, concerned with the rising costs and receding deadlines, and it was hard to justify carrying over seemingly unimportant words from the 1933 Supplement for a new work that was meant to stand on its own.
The workers were under severe time constraints due to the beginning of the concrete pour, and when they encountered hot springs or cavities too large to readily fill, they moved on without resolving the problem.
European health systems are under severe budgetary constraints, while having to respond to the challenges of an ageing population, rising expectations of citizens, and a steady decline in the number of health personnel [ 1, 2].
The opportunity to bask in each other's presence over an extended period of time — about three weeks — proved a luxury to artists who are regularly put under severe constraints of time and legality.
Finally, we expect that organisms that are under severe genome size constraints, in particular bacteria and viruses, will more often use CRUNCS.
But they did this under severe constraints: though illegal immigrants can legally attend public school and are allowed to attend many colleges and universities, they are barred from many scholarship and tuition-assistance programs and cannot be legally employed.
Others believe retailers are under severe pressure.
