Structures such as these are unique to the bacteriophages.
Then there is the lack of institutional structures, such as banking and governance procedures.
The new thinking advocated protecting coastlines with less invasive "soft structures," such as beaches and dunes.
Do you have structures, such as polyps or a deviated septum, that need surgery?
Organs increase in architectural complexity as they go from flat structures such as skin, cylindrical structures such as the vagina, to hollow non-tubular organs such as the bladder.
Subverting the rigidity of structures such as this has become, over a period of nearly 50 years, Altman's craft.
Guest corridors are almost a museum, with photos of iconic city structures, such as the recently reopened City Hall.
These days we are more familiar with them as showcase structures, such as the Eden project or Disney's Epcot.
Political structures such as the EU – centralised, opaque and managed by a clique of bureaucrats and elites – will never succeed.
Many internet firms' tax structures, such as those of Google and Amazon, exploit loopholes in this area.
"These include the potential unwinding of off-balance sheet funding structures, such as conduit structures," Mr. Sirri said.
