Results 211 to 220 of about 70,579 (241)

Microanalysis of tryptophan metabolites in mice

Analytical Biochemistry, 1974
Abstract Techniques were devised to quantitatively monitor a wide variety of tryptophan metabolites in a single mouse urine sample. Behavior of reference tryptophan standards on two-dimensional thin layer and DEAE-cellulose chromatography as well as fluorescence and color reactions were used to identify urinary tryptophan metabolites. The use of d,l
K M, Morris, R J, Moon
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Activation of the Ah Receptor by Tryptophan and Tryptophan Metabolites

Biochemistry, 1998
The aryl hydrocarbon receptor (AhR) is a ligand-dependent transcription factor that mediates many of the biological and toxicological actions of a variety of hydrophobic natural and synthetic chemicals, including the environmental contaminant 2,3,7, 8-tetrachlorodibenzo-p-dioxin (TCDD, dioxin). A variety of indole-containing chemicals, such as indole-3-
Heath-Pagliuso, S., Rogers, W.J., Tullis, K., Seidel, S.D., Cenijn, P.H., Brouwer, A., Denison, M.S.   +6 more
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Tryptophane Metabolites in Human Urine

Nature, 1953
I HAVE already reported1 that some human urine specimens made strongly alkaline yield distillates presenting spectroscopic and polarographic properties of o-aminoacetophenone. This was interpreted as indicating the presence of kynurenine in human urine, since (1) o-aminoacetophenone is not present in untreated urine, and (2) no substance other than ...
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Deuteration of catecholamines, catecholamine metabolites and tryptophan metabolites

Journal of Labelled Compounds and Radiopharmaceuticals, 1978
AbstractThe preparation of some deuterium labelled catecholamines, catecholamine metabolites and tryptophan metabolites is described. Simple exchange reactions in DC1/D20 solution or reductions with Li Al D4 were used. The deuterium labelled compounds prepared are suitable for use as internal standards for quantitative mass‐fragmentographic analysis of
Muskiet, F.A.J., Jeuring, H.J., Thomasson, C.G., van der Meulen, Jan, Wolthers, B.G.   +4 more
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Tryptophan metabolites in hypoglycemia associated with neoplasia

Cancer, 1966
Studies on tryptophan metabolites in the blood and urine of 5 additional patients having symptoms of hypoglycemia associated with neoplasia are reported. Three patients having islet cell tumors and hypoglycemia had normal levels of tryptophan metabolites in the blood and urine during hypoglycemia. A patient with metastatic carcinoma of the breast and a
M N, Silverstein, K G, Wakim, R C, Bahn
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Urinary excretion of tryptophan metabolites during phototherapy

The Journal of Pediatrics, 1974
PREVIOUS STUDIES in animals have d e m o n s t r a t e d that, under intense illumination, the transmission of light through living tissue takes place at a degree which causes the occurrence of photochemical reactions) It is known, in fact, that light exposure causes a decrease in blood riboflavin level.
F F, Rubaltelli, G, Allegri, C, Costa, A, De Antoni   +3 more
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Tryptophan metabolite excretion by the American cockroach

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 1973
Abstract 1. 1. Three fluorescing materials have been discovered in excreta from the American cockroach, Periplaneta americana (L.), and found to increase in concentration as dietary nitrogen increases. 2. 2. These compounds have been identified as kynurenic, xanthurenic and 8-hydroxyquinaldic acids. 3. 3.
D E, Mullins, D G, Cochran
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EXCRETION OF TRYPTOPHAN METABOLITES IN RHEUMATOID ARTHRITIS*

Annals of the New York Academy of Sciences, 1963
AbstractThe excretion of 3 hydroxy anthranilic acid, a metabolite of trytophan, was studied in a group of patients with rheumatoid arthritis, the other connective tissue diseases, and hospital controls. Ten of 26 patients with rheumatoid arthritis, 3 of 18 with the collagen diseases, and only 1 of 26 hospital controls excreted more than 500 μg.
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Tryptophan Metabolites in Parkinson’s Brain

1990
Quinolinic acid (QA) is an intermediate in the kynurenic pathway from tryptophan (TRP) to nicotinic acid. Recently, QA has been demonstrated to be increased in the aging rat brain1 and to act on neurons as an endogenous excitotoxin.2 Kynurenic acid (KYA), another product of this pathway, has been shown to antagonize excitotoxic amino acids and QA.3 ...
Tatsuji Ogawa, Shun-ichi Saso, Flint Beal, Kenton Swartz, Wayne Matson, Edward D. Bird   +5 more
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Beneficial actions of microbiota‐derived tryptophan metabolites

Neurogastroenterology & Motility, 2018
AbstractTryptophan is an important dietary amino acid and it is the precursor for 5‐hydroxytryptamine synthesis in the nervous system and by enterochromaffin cells in the gut mucosa. Tryptophan is also metabolized by enzymes in the gut mucosa and also by enzymes produced by the gut microbiome. Diet and the microbiome can contribute to metabolic disease
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