It is evident that, although a thlA mutant should be deficient in butanol, overexpressing thlA cannot push butanol yield significantly above that observed in the wild-type strain; this is consistent with experimental results in [ 43].
However, Mr Gorman thinks that it cannot push up its recycling rate much above 25% without incurring costs that may cancel out any environmental benefit.This does not impress environmental campaigners, who point out that London's boroughs aim to recycle 45% of household rubbish by 2005.
"That is a rule change for 2013 — that a teammate cannot push a teammate".
But political analysts say that both Mr. Gul and Mr. Erdogan learned from their experience in 1997 that they cannot push an Islamic agenda too far.
It is a great lesson for the Bush administration to learn that you cannot push religion and your version of morality down the people's throat.
Yet, in today's restless popular mood, he seems to calculate that he cannot push the trade unions too far.The same may hold for pension reform, which Mr Sarkozy has vowed to pursue after the regional elections.
Analysts say the main lesson of Mr. Abe's disastrous term as prime minister six years ago — when he was the first in a series of short-lived leaders — was that he cannot push too hard a nationalistic agenda while ignoring the economy.
"Many people find themselves unable to stop thinking about the suffering they witnessed, which is so powerfully seared into their brains that they cannot push it away," Dr. Jacobs said.
I recognize that NASA cannot push a system to launch more frequently than it is capable of, because this could mean overrunning the budget or, worse, cutting corners on safety.
Over the course of a dozen years as a senator from Nebraska, Mr. Hagel voted against unilateral economic sanctions against Iran, and had warned, sensibly to many in the Obama administration, that "you cannot push the Iranians into a corner where they can't get out".
