DNA from Salmonella species, when digested with the restriction enzyme Xba I, gives around 15 fragments ranging from 25 kb to 680kb. This pattern of fragments, or ‘fingerprint’, is unique to that strain. If the same fingerprint is found from bacteria from other infected people, then it can be assumed that they were all infected from a common source which can be analyzed by PFGE

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#Id: 3122

#Unit 3. Fundamental Processes

oriC also contains 11 GATC/CTAG repeats that are methylated on adenine on both strands.

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#Id: 1301

#Unit 2. Cellular Organization

P3 ATPases transports-H+ & Mg+2 

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#Id: 2817

#Unit 13. Methods in Biology

In the salt fractionation most polar will be fractionated with large amount of salt.

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#Id: 7885

#Unit 2. Cellular Organization

VDAC 

A multifunctional transmembrane channel protein (similar in structure to bacterial porins) allow passing of  ions and most small hydrophilic molecules (up to about 5000 Da).

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#Id: 8011

#Unit 10. Ecological Principles

                                   Richard hypothesis 

d/w = resource separation ratio.

d/w < 1, species cannot coexist;

1 < d/w < 3, there will be some competition between species

d/w > 3, species coexist harmoniously