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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Darwin (unit) ： ウィキペディア英語版 Darwin (unit) The darwin (d) is a unit of evolutionary change, defined by J.B.S. Haldane in 1949.〔J.B.S. Haldane (1949). "(Suggestions as to quantitative measurement of rates of evolution )." ''Evolution'' 3:51–56.〕 One darwin is defined to be an e-fold (about 2.718) change in a trait over one million years. Haldane named the unit after Charles Darwin. ==Equation== The equation for calculating evolutionary change in darwins ($r$) is: :$r=\backslash frac\; X\_2\; -\; X\_1\}$ where $X\_1$ and $X\_2$ are the initial and final values of the trait and $\backslash Delta\; t$ is the change in time in millions of years. An alternative form of this equation is: :$r=\backslash frac\; \backslash frac\}$ Since the difference between two natural logarithms is a dimensionless ratio, the trait may be measured in any unit. Also for this reason the darwin is a specialist form of the inverse mega-annum ($Ma^$). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Darwin (unit)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.