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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."
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:
Alliteration: the repetition of initial stressed, consonant sounds in a series of words within a phrase or verse line. [1] Cross rhyme; Holorime: identical pronunciation of different lines; in other words, when two entire lines have the same sound; Imperfect rhyme (aka half or near rhyme) Monorhyme; Pararhyme; Perfect rhyme (aka full or exact ...
[1] [2] Concerted reaction rates tend not to depend on solvent polarity ruling out large buildup of charge in the transition state. The reaction is said to progress through a concerted mechanism as all bonds are formed and broken in concert .
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]
Although deriving from native folk versification, it is possible that this line, and the related 6-syllable line, were influenced by Latin or Romance examples. [31] When employed in 4-line or 8-line stanzas and riming in couplets, this is called the Hungarian alexandrine; it is the Hungarian heroic verse form. [ 32 ]