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The researchers looked deeper into these observations, in hopes of gaining insight into the mechanisms underlying the high evolutionary rate and extraordinary immunologic plasticity of influenza HA. They probed in more detail the precise codons that are used by the virus to encode the influenza HA1 protein. The discriminated between codons on the basis of volatility. Each three-nucleotide codon is related by a single nucleotide change to nine 'mutational neighbours.' Of those nine mutations, some proportion change the codon to a synonymous codon and some change it to a nonsynonymous one, which directs the incorporation of a different amino acid into the protein. More volatile codons are those for which a larger proportion of those nine mutational neighbours encode an amino acid change. The use of particular codons in a gene at a frequency that is disproportionate to their random selection for encoding a chosen amino acid is termed codon bias. Such bias is common and is influenced by many factors, but here the collaborators found strong evidence for codon bias that was particular for and restricted to the amino acids making up the HA1 epitopes. Remarkably, they observed that influenza employs a disproportionate number of volatile codons in its epitope-coding sequences. There was a bias for the use of codons that had the fewest synonymous mutational neighbours. In other words, influenza HA1 appears to have optimized the speed with which it can change amino acids in its epitopes. Amino acid changes can arise from fewer mutational events. The antibody combining regions are optimized to use codons that have a greater likelihood to undergo nonsynonymous single nucleotide substitutions : they are optimized for rapid evolution.

Michael G Cordingley
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Volatility in the up direction is not a problem-it's only downward volatility that offers discourse.

Coreen T. Sol, Practically Investing: Smart Investment Techniques Your Neighbour Doesn't Know
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Fear tends to manifest itself much more quickly than greed, so volatile markets tend to be on the downside. In up markets, volatility tends to gradually decline.

Philip Roth
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A certain amount of volatility and drama can me healthy and keep things fun and interesting if you're willing at any moment during a fight to say, 'This means nothing. I love you, let's forget about it.

Anthony Kiedis, Scar Tissue
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Berlin is all about volatility. Its identity is based not on stability but on change.

Rory MacLean
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I could see that others had confused her disorganized passion for volatility. In reality, she was a scrumptious mess; deliciously majestic. She was on her way to great things in this life.

Steve Maraboli
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There's only one thing harder than living in a home with an adolescent - and that's being an adolescent. The moodiness, the volatility, the wholesale lack of impulse control, all would be close to clinical conditions if they occurred at another point in life. In adolescence, they're just part of the behavioral portfolio.

Jeffrey Kluger
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Sitting now...with my eyes wide open...I am simply amazed about human nature and its volatility...I am a killer. I am so aggressive. No, I am a lover. Love is the key. Acctually...I am a poet. And a pragmatic business woman. I was sad. And angry. But I am enthusiastic. I wanted to be a man. But I love being a woman.

Dragotel Viorica
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After seeing a movie that dramatizes nuclear war, they worried more about nuclear war; indeed, they felt that it was more likely to happen. The sheer volatility of people's judgement of the odds--their sense of the odds could be changed by two hours in a movie theater--told you something about the reliability of the mechanism that judged those odds.

Michael Lewis
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Quick-loving hearts ... may quickly loathe.

Elizabeth Barrett Browning, Sonnets from the Portuguese
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