Word: colis
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...host-vector systems refer to Eschirichia coli, a strain of bacteria that rarely survives outside the lab, which can be used as a host bacteria for recombinant DNA experiments...
...added the EK-2 stricture was originally proposed in a University of Michigan study that recommended the use of Eschirichia coli at all lab levels, from p-1 to p-4. It was limited by Michigan regents to p-3 and p-4 levels to save money, Hayes said...
...these experiments, researchers would transfer loose strands of DNA--the basic molecular unit of heredity--from warmblooded animals into specimens of E. coli, a commonly-utilized laboratory bacterium, in hopes of producing a new species with heretofore unknown characteristics...
Like Beads. Khorana's creation is a duplicate of one of the thousands of genes in the spiral-staircase structure of the DNA molecule in the common intestinal bacterium E. coli. Unlike human genes, which include millions of chemical "steps" along much larger DNA molecules, this bacterial gene contains only 199 full steps, each a pair of letters in the genetic code. Consisting of chemicals called nucleotides, these letters make up words in the gene's message-in this case, instructions to transfer the amino acid tyrosine to the cell's protein-manufacturing centers...
...connected end to end in proper sequence to duplicate the bacterial gene. In the course of their work, Khorana and his colleagues built not only the basic gene but the hitherto elusive start and stop signals at either end. When the synthetic gene was inserted into an E. coli cell with the help of a carrier virus known as a bacteriophage, it performed perfectly...