Thirteen of the 20 treatments applied to soil (succinic acid, [alpha]-ketoglutaric acid, mannitol, urocanic acid, L-asparagine, riboflavin, sucrose, uric acid, cellulose, root exudates, L-serine, [alpha]-ketobutyric acid, humic acid) resulted in significantly lower (P [less than or equal to] 0.
Treatments used to evaluate the microbial response to a range of organic C compounds (solutions prepared to provide 30 [micro]g C/g soil at a C: N:P ratio of 10:1:1) Group Organic C compound Amino acid L-Asparagine, L-arginine, glycine, L-serine Alcohol Mannitol Carbohydrate D-Glucose, sucrose Carboxylic Citric acid a-ketobutyric acid, [alpha]-ketoglutaric acid acid, succininc acid, uric acid Vitamin Thiamin, riboflavin Aromatic Urocanic acid Amine L-Glutamine Other Cellulose, fulvic acid humic acid synthetic root exudates (50 mM fructose, 50 mM D-glucose, 50 mM sucrose, 25 mM succinic acid, 25 mM DL-malic acid, 12.
Previously, scientists had suggested that urocanic acid
causes wrinkling during exposure to longer wavelength, UVA radiation but suppresses the immune system when stimulated with short wavelength, UVC light.
1, Geraniol, Imidazolidinyl urea, Kathon CG, Lactose, Mineral oil, Oleic acid, Parabens, Quaternium-15, Rosin, Saccharin and Talc down to Urocanic acid
According to the company, Gamma-PGA is an effective hydrophilic humectant capable of increasing the production of NMFs including pyrrolidonecarboxylic acid (PCA), lactic acid and urocanic acid
as compared to hyaluronic acid and soluble collagen.