Leu

I believe that the ∆(ara, leu) simply means that your strain of bacteria cannot catabolize arabinose or leucine. http://en.wikipedia.org/wiki/Bacterial_genetic_nomenclature

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i have read that the overall of protein charge should be neutralized. And proteins have more Ala, and less His, Cys, Pro, Ser and Leu than would be expected from codon multiplicities alone. can i say that natural selection can change the code?

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A cross is made between two E.coli strains....Hfr-arg+bio+leu+.....and F-arg-bio-leu-.....interrupted mating studies revealed that arg enters the recipient last. so arg+ recombinants are selcted on a medium containing only bio n leu. these recombinants ...

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... media for the E.coli strain with the following genotype F'[lacIq Tn10(tetR)] mcrA Δ(mrr-hsdRMS-mcrBC) φ80lacZΔM15 ΔlacX74 recA1 araD139 Δ(ara-leu) 7697 galU galK rpsL(StrR) endA1 nupG with the addition of Leucine I have managed to grow them, but the yield is anything but great. I am a little ...

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... following requirements: • High expression promoter that is independent of GAL system. • Marker for selection of transformants in yeast that is not Leu, Trp, His or Ura. I currently have clones set up with the Invitrogen two-hybrid system to test specific protein interactions, but I’ve found no ...

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