Effect of riboflavin deficiency on free amino acid nitrogen concentrations of liver, muscle and plasma

1968 ◽  
Vol 24 (8) ◽  
pp. 786-787 ◽  
Author(s):  
A. K. Chatterjee ◽  
B. B. Ghosh
Keyword(s):  
Amino Acid ◽  
Free Amino Acid ◽  
Free Amino ◽  
Riboflavin Deficiency ◽  
Amino Acid Nitrogen ◽  
Nitrogen Concentrations

Carbon and nitrogen allocation patterns of Douglas-fir seedlings fertilized with nitrogen in autumn. I. Overwinter metabolism

1986 ◽  
Vol 16 (5) ◽  
pp. 897-902 ◽  
Author(s):  
H. A. Margolis ◽  
R. H. Waring
Keyword(s):  
Amino Acid ◽  
Free Amino Acid ◽  
Total Nitrogen ◽  
Fine Roots ◽  
Free Amino ◽  
Douglas Fir ◽  
Pronounced Increase ◽  
Nitrogen Concentrations ◽  
Biochemical Analyses ◽  
Amino Acid Concentrations

Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings at a western Oregon nursery were fertilized in October 1983 with ammonium nitrate and harvested for biochemical analyses on four dates over autumn and winter 1983–1984. Free amino acid and total nitrogen concentrations in the needles of fertilized seedlings showed a pronounced increase 1 month after fertilization. Free amino acid concentrations of fertilized seedlings decreased in needles during winter but remained stable in stems and fine roots. Just before budbreak in mid-March, free amino acid concentrations increased significantly in stems and fine roots. Total nitrogen concentrations increased 1 month after fertilization, remained stable throughout winter, and tended to decrease or remain stable just before budbreak. Starch and total nonstructural carbohydrate concentrations of needles and stems of fertilized seedlings were lower just before budbreak and sugar concentrations of fine roots of fertilized seedlings were lower when data from all harvests were combined. The reduction in carbohydrate reserves following fertilization probably reflects increased respiration associated with the synthesis and maintenance of higher levels of enzymes.

Use of a Peptide Rather Than Free Amino Acid Nitrogen Source in Chemically Defined “Elemental” Diets

1980 ◽  
Vol 4 (6) ◽  
pp. 548-553 ◽  
Author(s):  
David B. A. Silk ◽  
Peter D. Fairclough ◽  
Michael L. Clark ◽  
John E. Hegarty ◽  
Jill M. Addison ◽  
...  
Keyword(s):  
Amino Acid ◽  
Nitrogen Source ◽  
Free Amino Acid ◽  
Free Amino ◽  
Amino Acid Nitrogen ◽  
Elemental Diets

Effects of glucocorticoids on glutamine metabolism in skeletal muscle

1984 ◽  
Vol 247 (1) ◽  
pp. E75-E83 ◽  
Author(s):  
F. Muhlbacher ◽  
C. R. Kapadia ◽  
M. F. Colpoys ◽  
R. J. Smith ◽  
D. W. Wilmore
Keyword(s):  
Skeletal Muscle ◽  
Amino Acid ◽  
Free Amino Acid ◽  
Free Amino ◽  
Glutamine Metabolism ◽  
Glutamine Concentration ◽  
Amino Acid Nitrogen ◽  
Flux Measurements ◽  
Altered Metabolism

The effects of dexamethasone on nitrogen and amino acid metabolism in the dog were studied in order to gain insight into the role of glucocorticoids in accelerated proteolysis and altered metabolism of glutamine in catabolic illnesses. After dexamethasone administration at a dose of 0.44 mg X day-1 X kg-1, nitrogen balance shifted from slightly positive (+0.126 g N X day-1 X kg-1) to markedly negative (-0.278 g N X day-1 X kg-1). This was associated with a 23% fall in total free amino acid nitrogen in skeletal muscle, with 80% of the decline accounted for by a decrease in glutamine. Plasma glutamine concentration decreased by 26%, although total plasma free amino acid nitrogen was unchanged because of a 49% increase in alanine. The alterations in intracellular and circulating levels of glutamine were not accompanied by measurable changes in glutamine synthetase or glutaminase activities in skeletal muscle. Hindquarter amino acid flux measurements demonstrated that the decline in intracellular glutamine concentration was associated with a marked increase in glutamine efflux from skeletal muscle. This occurred in spite of minimal changes in the intracellular/extracellular glutamine gradient. It is concluded that accelerated muscle glutamine release caused by glucocorticoids is a major contributor to the decreased glutamine levels in muscle that occur during critical illnesses.

scholarly journals ALTERATION IN CARBOHYDRATE METABOLISM BY SUB-ACUTE LEAD EXPOSURE: A DOSE-DEPENDENT STUDY

2017 ◽  
Vol 9 (3) ◽  
pp. 254
Author(s):  
Pritha Das ◽  
Sudipta Pal
Keyword(s):  
Body Weight ◽  
Amino Acid ◽  
Free Amino Acid ◽  
Pyruvic Acid ◽  
Pyruvate Dehydrogenase ◽  
Enzyme Activities ◽  
Free Amino ◽  
Weight Group ◽  
Amino Acid Nitrogen ◽  
Dose Dependent

Objective: The study was conducted to evaluate the dose-dependent effects of sub-acute lead exposure on certain aspects of carbohydrate metabolism.Methods: Swiss albino male mice (weighing 30-35 g) were selected for the present study and divided into five groups; one control group and others lead-treated groups i.e. Group A (5 mg/kg body weight), Group B (10 mg/kg body weight), Group C (15 mg/kg body weight) and Group D (20 mg/kg body weight). Parameters like blood and liver glucose, glycogen and pyruvic acid contents were determined in liver tissue. The enzyme activities like pyruvate dehydrogenase, malate dehydrogenase and glucose 6-phosphatase were recorded in that tissue. Additionally, free amino acid nitrogen content and transaminase enzyme activities were also evaluated in liver tissue of mice.Results: The study reveals that lead caused a significant diminution of blood and hepatic glucose levels and fall in liver glycogen content in a dose-dependent manner, the highest effect was observed in animals treated with lead at a dose of 20 mg/kg body weight. Glucose 6-phosphatase activity was decreased significantly in all the treated groups. There was a dose-dependent increase in pyruvic acid content whereas pyruvate dehydrogenase, malate dehydrogenase and transaminase enzyme activities were significantly depressed in a dose-dependent fashion in all the treated animals. Additionally, lead treatment significantly (p<0.001) enhanced free amino acid nitrogen in the liver to provide a substrate for gluconeogenesis.Conclusion: It is suggested that an adaptive mechanism is initiated by stimulating and retarding glycogenolytic and glycolytic activity and also by rising in the content of free amino acid nitrogen to recover from the lead stressed toxic manifestation

The effect of steaming on the free amino acid contents and antioxidant activity of ginseng

Planta Medica ◽  
2008 ◽  
Vol 74 (09) ◽  
Author(s):  
EJ Cho ◽  
XL Piao ◽  
MH Jang ◽  
SY Park ◽  
SW Kwon ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Amino Acid ◽  
Free Amino Acid ◽  
Free Amino ◽  
Amino Acid Contents

Tronchuda cabbage (Brassica oleracea L. var. costata DC) leaf free amino acid profile

Planta Medica ◽  
2008 ◽  
Vol 74 (09) ◽  
Author(s):  
BM Silva ◽  
AP Oliveira ◽  
DM Pereira ◽  
C Sousa ◽  
RM Seabra ◽  
...  
Keyword(s):  
Amino Acid ◽  
Brassica Oleracea ◽  
Free Amino Acid ◽  
Free Amino ◽  
Amino Acid Profile ◽  
Tronchuda Cabbage ◽  
Brassica Oleracea L
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