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Indole is an organic compound with the formula C 6 H 4 CCNH 3. Indole is classified as an aromatic heterocycle. It has a bicyclic structure, consisting of a six-membered benzene ring fused to a five-membered pyrrole ring. Indoles are derivatives of indole where one or more of the hydrogen atoms have been replaced by substituent groups.
For example, either 2-2-5 or 1-1-5 would give a point value of 5, and either would outscore a roll of 3-3-4 (point value of 4), which would in turn outscore a roll of 5-5-2 (point value of 2). Possible point values range from 2 to 5, since point values of 6 and 1 are special cases.
Indole test positive: appearance of pink layer at top (e.g. Escherichia coli) Like many biochemical tests on bacteria, results of an indole test are indicated by a change in color following a reaction with an added reagent. Pure bacterial culture must be grown in sterile tryptophan or peptone broth for 24–48 hours before performing the test.
The Bertrand paradox is a problem within the classical interpretation of probability theory. Joseph Bertrand introduced it in his work Calcul des probabilités (1889) [1] as an example to show that the principle of indifference may not produce definite, well-defined results for probabilities if it is applied uncritically when the domain of possibilities is infinite.
While black balls are set aside after a draw (non-replacement), white balls are returned to the urn after a draw (replacement). The probability P(m,k) that k black balls will be drawn after m draws can be calculated recursively using the formula P ( m , k ) = y + 1 − k x + y + 1 − k P ( m − 1 , k − 1 ) + x x + y − k P ( m − 1 , k ...
Given a hexagon A 1 A 2 A 3 A 4 A 5 A 6 with equilateral triangles constructed on the sides, either inwardly or outwardly, and the apexes of the equilateral triangles labelled B i. If G 1, G 3, G 5 are the respective centroids of B 6 B 1 B 2, B 2 B 3 B 4, B 4 B 5 B 6, then G 1, G 3, G 5 form an equilateral triangle. [23]
A line colloquially known as the Berlin draw is often utilized by top-level players to agree to an early draw: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Nd6 6.dxe5 Nxb5 7.a4 Nbd4 8.Nxd4 Nxd4 9.Qxd4 d5 10.exd6 e.p. Qxd6 11.Qe4+ Qe6 12.Qd4 Qd6 13.Qe4+ Qe6 14.Qd4 Qd6, with the game ending in a threefold repetition draw claim on move 14, or on ...
para-Dimethylaminobenzaldehyde is an organic compound containing amine and aldehyde moieties which is used in Ehrlich's reagent and Kovac's reagent to test for indoles.The carbonyl group typically reacts with the electron rich 2-position of the indole but may also react at the C-3 or N-1 positions. [2]