Growth in citrate broth was turbid, rusty brown in color with some slime formation. The glucose broth had a milky white color with pronounced slime accumulation. Cells grown on the citrate medium were uniformly spaced within the sheath and ranged from 1 to 4 μ in length and 1 to 2 μ in width. The sheath was uniform in shape and ranged from 2.0 to 2.5 μ in width in young cultures. Sheath irregularities began to appear by the third day and were the greatest, 1 to 12 μ, by the fifth day when they gave the appearance of disintegrating. Cells grown on the glucose medium had clear intracellular structures and ranged from 2.5 to 6.0 μ in length, 1.0 to 2.5 μ in width with the sheath ranging from 1.5 to 3.5 μ.
Proceedings of the Iowa Academy of Science
©1969 Iowa Academy of Science, Inc.
Tjaden, David H. and Goss, Robert C.
"Sheath and Cellular Irregularities of Sphaerotilus natans Caused by Ferric Ammonium Citrate and Glucose,"
Proceedings of the Iowa Academy of Science, 76(1), 38-44.
Available at: https://scholarworks.uni.edu/pias/vol76/iss1/7