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A (4+3) cycloaddition [1] is a cycloaddition between a four-atom π-system and a three-atom π-system to form a seven-membered ring. Allyl or oxyallyl cations (propenylium-2-olate) are commonly used three-atom π-systems, while a diene (such as butadiene) plays the role of the four-atom π-system.
Concerted evolution (phenomenon of duplicated genes) may often be caused by the genetic exchange known as gene conversion. [3] This other phenomenon is known as the "non-reciprocal exchange of genetic material between homologous sequences."
The human genome contains an estimated 100,000 truncated and 4,000 full-length LINE-1 elements. [10] Due to the accumulation of random mutations, the sequence of many LINEs has degenerated to the extent that they are no longer transcribed or translated. Comparisons of LINE DNA sequences can be used to date transposon insertions in the genome.
A child that has been concertedly cultivated will often express greater social prowess in social situations involving formality or structure attributed to their increased experience and engagement in organized clubs, sports, musical groups as well as increased experience with adults and power structure. This pattern of child rearing has been ...
The second lines of the two stanzas are different, but rhyme at the end with the first and last lines. (In other words, all the "A" and "a" lines rhyme with each other, but not with the "b" lines.) XAXA – Four lines, two unrhymed (X) and two with the same end rhyme (A) Other notation examples:
Poulter's measure: couplets in which a 12-syllable iambic line rhymes with a 14-syllable iambic line. [1] Envoi (or envoy): the brief stanza that ends French poetic forms such as the ballade or sestina. Ghazal; Octave: an 8-line stanza or poem. Ottava rima: an Italian stanza of eight 11-syllable lines, with a rhyme scheme of ABABABCC. Quatorzain
An 1850 acrostic by Nathaniel Dearborn, the first letter of each line spelling the name "JENNY LIND". An acrostic is a poem or other word composition in which the first letter (or syllable, or word) of each new line (or paragraph, or other recurring feature in the text) spells out a word, message or the alphabet. [1]
Decasyllabic quatrain is a poetic form in which each stanza consists of four lines of ten syllables each, usually with a rhyme scheme of AABB or ABAB. Examples of the decasyllabic quatrain in heroic couplets appear in some of the earliest texts in the English language, as Geoffrey Chaucer created the heroic couplet and used it in The Canterbury Tales. [1]