Natural halogen-containing organics

Other filamentous blue reen algae, such as Lyngbya, Oscillatoria, and 

Schizothrix, abound in estuarine ecosystems, and these algae are known to produce various modifications of the toxic bromophenol aplysiatoxin (2) (Mynderse et al., 1977 Mynderse and Moore, 1978). Compound 2 derives its name since it was isolated initially as the toxic component of the sea hare Stylocheilus longicauda (Aplysidae) (Kato and Scheuer, 1974). 

Several species of marine bacteria are also known to produce bromine-containing compounds. Pseudomonas bromoutilis (Burkholder et al., 1960) and an undescribed Chromobacterium sp. (Anderson et al., 1974) have been shown to produce, among other compounds, the pyrrole derivative 3, which contains 72% bromine by weight. The list of halogenating microorganisms will no doubt grow as more is learned about these organisms. The major 

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The arsenical war gases contain halogen atoms or organic radicles such as —CN, —SCN, etc., besides the arsenic atom. The nature of the aggressive action depends on the number and the nature of the organic radicles with which the arsenic atom is linked. 

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