Cystine .08 ----------------------------------------------------------------- Glutamic acid 7.67 ----------------------------------------------------------------- Glycine 2.76 ----------------------------------------------------------------- Histidine .95 ----------------------------------------------------------------- Isoleucine 2.17 ----------------------------------------------------------------- Leucine 4.04 ----------------------------------------------------------------- Lysine 2.65 ----------------------------------------------------------------- Methionine 1.14 ----------------------------------------------------------------- Phenylalanine 2.20 ----------------------------------------------------------------- Proline 2.06 ----------------------------------------------------------------- Serine 1.80 ----------------------------------------------------------------- Threonine 2.15 ----------------------------------------------------------------- Tryptophan .78 ----------------------------------------------------------------- Tyrosine 1.79 ----------------------------------------------------------------- Valine 3.03 ----------------------------------------------------------------- ⁸ Trace amounts of the following were also found: methionine sulfoxide, citrulline, alpha-amino-n-butyric acid, homocitrulline, glucosamine, galactosamine, methionine sulfoximine, ethionine, and ethanolamine. The lipid content of rapidly growing cells is normally quite low (0.45 to 2.3 percent crude ether extractable lipids). The most important lipid is poly-beta-hydroxybutyric acid, which is stored under the growing conditions of insufficient nitrogen or oxygen supply (refs. [ref.187] and [ref.191]). Under these conditions, this unusual polymer constitutes up to 80 percent of the dry weight. While the monomer itself, beta-hydroxybutyric acid, is rapidly and efficiently used in cell metabolism, the nutritive value of the polymer is yet to be determined. The fatty acids found include lauric, myristic, palmitic, palmitoleic, heptadecaenoic, C17 saturated(?), stearic, linoleic, and linolenic(?) ([ref.195]). Application to Spacecraft System