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. 2018 Dec 20;17(1):1. doi: 10.3390/md17010001

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Molecular structure of various microalgal polyamines. (A) The polyamines commonly found in various microalgae; (B) Special long-chain polyamines present in diatoms. The thick red line in the chemical structure represents the aminopropyl groups while the fine black line represents the aminobutyl or aminopentyl groups. Dap, diaminopropane; Put, putrescine; Cad, cadaverine; NSpd, nor-spermidine; Spd, spermidine; NSpm, nor-spermine; Spm, spermine; TSpm, thermospermine; LCPAs, long-chain polyamines.