Molecular rulers?
نویسندگان
چکیده
منابع مشابه
Molecular rulers?
What is a ‘molecular ruler’? The lengths of many linear polymers in biology are specified with remarkably accuracy, indicating they have very similar or the same numbers of subunits. Examples include bacteriophage tails, bacterial flagellum hooks, bacterial ‘injectisome’ needles, and the thin and thick filaments of striated muscles. Such exact assembly requires explanation, because the same sub...
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We derive general covariant expressions for the six independent observable modes of distortion of ideal standard rulers in a perturbed Friedmann-Robertson-Walker spacetime. Our expressions are gauge invariant and valid on the full sky. These six modes are most naturally classified in terms of their rotational properties on the sphere, yielding two scalars, two vector (spin-1), and two tensor (s...
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The Math Factor podcast posed the problem of finding the smallest number of inch marks on a 12 inch ruler so that one could still measure any integer length from 1 to 12. One needs only four additional marks besides 0 and 12; for example 1, 4, 7, 10 works. This entertaining problem lead to others during the next few minutes (you can listen at mathfactor.uark.edu/2005/10) and inspired us to look...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2012
ISSN: 0960-9822
DOI: 10.1016/j.cub.2012.02.049