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Minipreparation of plasmid DNA is a rapid, small-scale isolation of plasmid DNA from bacteria. [20] [21] Commonly used miniprep methods include alkaline lysis and spin-column based kits. [3] [22] It is based on the alkaline lysis method. The extracted plasmid DNA resulting from performing a miniprep is itself often called a "miniprep".
Structure of a lipopolysaccharide (LPS) Lipopolysaccharide, now more commonly known as endotoxin, [1] is a collective term for components of the outermost membrane of the cell envelope of gram-negative bacteria, such as E. coli and Salmonella [2] with a common structural architecture.
Plasmid Cloning Guides Molecular Cloning Guides —References to help scientists design plasmid cloning experiments, including tutorials on restriction enzyme digestion and PCR-based cloning. Molecular Cloning Protocols —Specific protocols for a variety of plasmid cloning techniques, such as isolation of bacterial colonies, DNA purification ...
Alternatively, by reducing the availability of cofactors (such as Mg 2+) or otherwise interfering with their interaction with the DNA polymerase, PCR is inhibited. [ 3 ] In a multiplex PCR reaction, it is possible for the different sequences to suffer from different inhibition effects to different extents, leading to disparity in their relative ...
The activated region of the delta toxin is composed of three distinct structural domains: an N-terminal helical bundle domain (InterPro: IPR005639) involved in membrane insertion and pore formation; a beta-sheet central domain involved in receptor binding; and a C-terminal beta-sandwich domain (InterPro: IPR005638) that interacts with the N-terminal domain to form a channel.
Because endotoxin molecular weight may vary a great deal (10,000 to 1,000,000 Da), endotoxin levels are measured in "endotoxin units" (EU). One EU is approximately equivalent to 100 pg of E. coli lipopolysaccharide—the amount present in around 10 5 bacteria. Humans can develop symptoms when exposed to as little as 5 EU/kg body weight.
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