• coli
  • A second common laboratory strain is the B strain, whose history is less straightforward and the first naming of the strain as E. coli B was by Delbrück and Luria in 1942 in their study of bacteriophages T1 and T7. (wikipedia.org)
  • The original E. coli B strain, known then as Bacillus coli, originated from Félix d'Herelle from the Institut Pasteur in Paris around 1918 who studied bacteriophages, who claimed that it originated from Collection of the Institut Pasteur, but no strains of that period exist. (wikipedia.org)
  • sequences
  • Besides, Dunn and Studier (1983) have exhaustively analyzed the genome structure of T7, giving the full sequence of the 39,936 base pairs of its DNA and a complete survey of its 50-odd genes and its functions (where known), in addition to a full analysis of its signal sequences, such as the terminal repeats, promoters, terminators, processing sequences for RNase III, and origins of DNA replication. (springer.com)
  • structure
  • Rather, I shall here recapitulate some of the basic findings with regard to structure and life cycle of T7 in order to allow the reader to follow my thought with regard to the main problem I have in mind (but which I am unable to solve): How did this surprising biological entity come about? (springer.com)
  • With the discovery of the structure of DNA in 1953 by Watson and Crick, genetics entered the DNA age. (retzepti.ru)
  • She noted that the change from Structure A to Structure B was reversible, depending on the levels of sample hydration (Franklin and Gosling, 1953). (rrnursingschool.biz)
  • In 1953, based on X-ray diffraction images taken by Rosalind Franklin and the information that the bases were paired, James D. Watson and Francis Crick suggested what is now accepted as the first accurate model of DNA structure in the journal Nature . (newworldencyclopedia.org)
  • found
  • The restriction modification system (RM system) is found in bacteria and other prokaryotic organisms, and provides a defense against foreign DNA, such as that borne by bacteriophages. (wikipedia.org)
  • They found that bacteriophage growing within an infected bacterium could be modified, so that upon their release and re-infection of a related bacterium the bacteriophage's growth is restricted (inhibited) (also described by Luria in his autobiography on pages 45 and 99 in 1984). (wikipedia.org)