Search results
Results From The WOW.Com Content Network
The quaternary sector of the economy is based upon the economic activity that is associated with either the intellectual or knowledge-based economy. [1] This consists of information technology; media; research and development; information-based services such as information-generation and information-sharing; and knowledge-based services such as consultation, entertainment, broadcasting, mass ...
Quaternary is a term used in organic chemistry to classify various types of compounds (e. g. amines and ammonium salts). [ 1 ] Red highlighted central atoms in various groups of chemical compounds.
It is a rapidly changing field with new research techniques being developed e.g. new dating techniques. Quaternary science is a field of study which involves geography, biology, chemistry, and physics. [4] Its focus is during the Quaternary Period – a time period that started around 2.58 million years ago and which continues to the present ...
The Quaternary is a geologic period. Quaternary (an adjective meaning "fourth in order" or "composed of four items") may also refer to: Quaternary (chemistry) (see also Quaternary compound and Quaternary phase) Quaternary structure of proteins; Quaternary sector of the economy, which encompasses knowledge-based services
In chemistry, a quaternary compound is a compound consisting of exactly four chemical elements. In another use of the term in organic chemistry , a quaternary compound is or has a cation consisting of a central positively charged atom with four substituents, especially organic ( alkyl and aryl ) groups, discounting hydrogen atoms.
Language links are at the top of the page across from the title.
A technopole, commonly referred to as a high-technology cluster or tech hub, refers to a center of high-tech manufacturing and information-based quaternary industry. [1] The term was coined by Allen J. Scott in 1990 to describe regions in Southern California which showed a rapid growth in high technology fields. [2]
E. coli alkaline phosphatase, a dimer enzyme, exhibits intragenic complementation. [5] That is, when particular mutant versions of alkaline phosphatase were combined, the heterodimeric enzymes formed as a result exhibited a higher level of activity than would be expected based on the relative activities of the parental enzymes.