To understand the mechanism, Dr Clarke and his collaborators made a synthetic version of the bacterium and discovered that the organism generated a charge, and effected a chemical change, when in direct contact with the mineral surface.
The supply chain starts with local farmers, who harvest the leaves in August, when they are richest in artemisinin, and sell then to a handful of companies, mainly Chinese, which extract the chemical and change it into one of the more active derivatives.
He said any movement of chemical weapons, any deployment of chemical weapons would change his calculus.
Obama has insisted that any use of chemical weapons would change his thinking about the United States' role in Syria but said he didn't have enough information to order aggressive action.
One answer, he thinks, is to change the chemical make-up of trading floors by hiring more older men and, especially, women.
This involves shining light through a patterned mask and on to the surface of a chip, so as to change the chemical properties of the exposed parts of that chip.
The trick is to find a way to make this flow rate change when the chemical that the sensor has been designed to detect is present.
While Mr Raymond, with his doctorate in chemical engineering, publicly doubted climate change, the company quietly researched whether global warming could open up new areas for oil exploration.
However, Obama repeated past warnings that his stance on military involvement could change if the Syria uses chemical weapons.
CNN: Obama takes it easy on the last day of a busy Mideast visit
At the same time, Obama repeated past warnings that his stance on military involvement could change if the Syrian government uses chemical weapons.
Obama had repeatedly drawn a "red line" on the use of chemical weapons by the Syrian regime, warning President Bashar al-Assad that using or moving chemical stockpiles was the one thing that would " change my calculus" on that war.
Configurable triggers such as removal or tampering of the drive, removal of device from a resting GPS point, cellular telephone call, or even a change in temperature will release a "chemical mist" into the drive (not the computer) destroying it layer by layer.
ENGADGET: Chemically misting hard drives and other remote data security solutions
"For the Syrian government to utilize chemical weapons on its people crosses a line that will change my calculus and how the United States approaches these issues, " Obama said Friday.
Some, including Dr Riebesell, suspect that these physical and chemical effects of warming may prove a greater driver of productivity change in the ocean than altered pH.
All of which suggests that fathers-to-be are undergoing almost as much of a change of life probably as a result of behavioural and chemical signals from the mother as that mother is herself.
That may change this time, especially if soldiers face a real threat of biological or chemical weapons.
Achieving this sort of change is comparable to how car manufacturers have instilled a commitment to quality or chemical companies such as DuPont have succeeded in making safety first such a central value.
The next stage, currently still in the laboratory, is to develop coatings that change colour when they absorb toxic chemicals, thus alerting soldiers that they are under chemical attack.
应用推荐