Akeman Street Kirtlington also uses its course. Other parts are in use as public footpaths, including a stretch between Tackley and Stonesfield that is part of the Oxfordshire Way. The origins of the road's name are uncertain but certainly date back to the Early Middle Ages. Some have suggested that "Akeman" derives from the Anglo-Saxon words for "oak-man". Others have suggested a connection with Bath, which the Anglo-Saxons called "Acemannesceastre" ("Acemannes" apparently being derived from the Roman name Aquae Sulis). It is unclear how this might have become associated with the road, but one possibility is that the name was originally used
Aphanizomenon flos-aquae (dietary supplement) from the air, and water to synthesize proteins, carbohydrates, and lipids. AFA is also able to directly use molecular nitrogen from the air to produce proteins and other nitrogen-containing biomolecules. This ability is widespread in prokaryotes, but unknown in eukaryotes. "Aphanizomenon flos-aquae" as a species has both toxic and non-toxic forms. While benefits have been indicated, toxicity has been shown in some strains of the species "Aphanizomenon flos-aquae", with cylindrospermopsin and saxitoxins present, and microcystins found contaminating AFA dietary supplements. The World Health Organization's "Guidelines For Drinking Water Quality" note Anatoxin-a, saxitoxins, and cylindrospermopsins are present in the Aphanizomenon genus.