The microstructure of a turtle shell's carapace elicits a sandwich structure of waxy top surface with a harder sub-surface layer serving as a shielding structure, followed by a lamellar carbonaceous layer serving as shock absorber, and the inner porous matrix serves as a load-bearing scaffold while acting as reservoir of retaining water and nutrients.
Mr. Gephardt also said that the endorsement should not serve as a "shield" to protect Dr. Dean from having to explain his earlier commentary on the caucuses.
Of course, crises like Bosnia and Rwanda will continue to arise, and over the years Annan has argued that sovereignty must not be allowed to serve as a shield when a government turns against its civilians.
In all cases, optimism serves as a shield, allowing us to see the world in a light that is more conducive to our own mental and physical well-being.
The Emirates' wealth has served as a shield against the economic pressures that have provoked unrest in the Arab world, and leaders here further expanded generous social welfare programs that provide housing, education and medical care for free for citizens.
All this has dented Ms Fernández's popularity: her approval rating has fallen from 70% in December to 50% this month.Repsol had hoped that Mr Eskenazi would serve as a shield against government aggression.
"Anyone who would use the Internet to commit a crime should understand one thing -- do not count on the anonymity of the Internet to serve as a shield for your illegal conduct," Mr. Mayorkas said.
Just as few states or peoples want the Security Council to be a rubber stamp for unilateralist American policy, so, too, will it lose credibility if it serves as a shield behind which unspeakable outrages can take place in the name of safeguarding sovereignty.
Mr. Edwards, a Democrat, has argued that the Bush administration uses the phrase "global war on terror" as a "bumper sticker" slogan that serves as a shield to pursue dangerous policies like the war in Iraq, which has come back to haunt the United States by increasing the threat of terrorism.
"It's like it's saying, 'Hey, I'm doing this thing.' " Such a barrier served as a shield of sorts nearly 10 years ago when he shot a horrific accident in Laurelton, Queens, when a tree fell on a church bus, killing four young girls inside.
