Feltham Urban District grounds of St Mary's Church, Bedfont, which are accepted as local emblems. The winged sword stands for London Airport and the district's close association with the aircraft industry. The sword also refers to the Royal Army Ordnance Depot, and to the ancient sword-mill marked on a 17th-century map. The gunstones also allude to the R.A.O.C. Depot, and to the powder mills which formerly existed in the Crane Valley. The hawthorn refers to the Spelthorne Hundred, and the eagle is a reference not only of air traffic, but also of the Roman-founded London to Bath (Aquae Sulis) and Calleva Atrebatum (town
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.