The phrase "circulate for" is not a grammatically correct phrase in English.
If you want to use it in a sentence, you would need to add a preposition such as "around" or "through." For example, you could say: "I circulated the petition around the office for signatures."
In addition, as noted in section Nanocarrier Behavior in the Circulation, flexible particles circulate for a longer time and have a better chance of achieving target than rigid particles.
They enter the bloodstream and circulate for a few hours, after which they leave the circulation and die.
Various figures circulate for the cost of doing business with cyber-criminals.
If it is able to circulate for some considerable time, it can mutate to a strain capable of causing disease, called a circulating vaccine-derived poliovirus.
The cocoon of water around the pegylated version effectively makes it a much larger object, allowing it to circulate for a week.
So the DPP is in the process of drawing up draft guidelines, which he hopes to circulate for public comment next month.
Notes and coins in national currencies will continue to circulate for another three years; only in 2002 will they see euro cash.
This allows the modified virus to circulate for longer in a patient's blood stream and thus have a better chance of getting to tumours disseminated around the body.
A positive AO weakens the Beaufort gyre with respect to the drift, allowing ice that would otherwise circulate for years to be flushed out into the North Atlantic.
Unlike soot or sulfur pollution, which falls out of the atmosphere within days or weeks, molecules of carbon dioxide and other greenhouse gases can circulate for a century or more.
Overshadowed by news elsewhere in recent weeks, China has been rounding up writers, lawyers, and activists since mid-February, when calls began to circulate for protests inspired by those in the Middle East and North Africa.
