Yet the essential conundrum, succinctly stated in a 1961 tobacco-industry memo, will remain: "There are biologically active materials present in cigarette tobacco.
The rest of the materials present in coatings are used in weight or volume percentages of 1 percent or less and are therefore known as specialty additives.
For instance, over the summer the National Institute of Standards and Technology in Gaithersburg, Md., conducted tests of different materials present in the dorm to determine what it would take to ignite them, investigators said.
"These materials present a pattern of activity that had the effect of revealing intelligence methods that have been employed worldwide," Mr. Tenet said in an August 11 letter to lawmakers.
"The earliest materials present very limited roles for Aboriginal participation in the parliamentary process and make little effort to engage with existing governance structures in communities or with the concerns of potential Indigenous voters.
As these changes occur, there is a tendency over time to an equilibrium condition a balance between form and processes that depends upon the nature of the materials present (e.g., the size of sand and gravel present).
One mode of classification is by coal type; such types have some genetic implications because they are based on the organic materials present and the coalification processes that produced the coal.
All the materials present good photocatalytic performance and magnetic response.
Conductive fibrous porous materials present strong anisotropy in electrical conductivity.
Chemical oxygen demand (COD): the amount of chemically oxygen disable materials present in the waste water.
In contrast, antiferromagnetic materials present no net magnetic moment at any temperature.
