scholarly journals Studies on the nitrogen-metabolism of mosquitoes : (1) The relation of free amino acids and protein in the tissues of Culex pipiens-during the development

1955 ◽  
Vol 6 (3-4) ◽  
pp. 141-146
Author(s):  
Yukio Yoshida
Keyword(s):  
Amino Acids ◽  
Nitrogen Metabolism ◽  
Free Amino Acids ◽  
Free Amino ◽  
Culex Pipiens

CHANGES IN PEACH TREES (cv. RED HAVEN) ATTACKED BY TAPHRINA DEFORMANS, WITH PARTICULAR REFERENCE TO NITROGEN METABOLISM IN INFECTED AND NON-INFECTED LEAVES

1967 ◽  
Vol 45 (4) ◽  
pp. 459-477 ◽  
Author(s):  
Vittorio Raggi
Keyword(s):  
Amino Acids ◽  
Nitrogen Metabolism ◽  
Free Amino Acids ◽  
Free Amino ◽  
Dry Weight ◽  
Infected Tissue ◽  
Diseased Plant ◽  
Glycolytic Activity ◽  
Protein Amino Acids ◽  
Peach Trees

Some of the changes induced by Taphrina deformans on metabolism (particularly the nitrogen metabolism) of peach leaves were studied. Observations were as follows. (1) Dry weight diminishes in the infected tissues, especially at the end of the cycle, whereas it remains almost unchanged in the non-infected tissues of the diseased plant. (2) Initially, the amount of total nitrogen, per gram of dry substance is clearly greater in the infected tissues than in the control, then it becomes lower during the differentiation of the asci, especially at the stage of full sporulation. Similar variations occur also, in a more attenuated form, in the non-infected tissues. (3) A considerable increase of the glycolytic activity is observed in the infected tissue especially during the period preceding the differentiation of the asci, and an increase of respiration, even though much more restricted, is observed also in the next period. In non-invaded tissues, an increase of glycolysis is noted along with a diminution of respiration. (4) The non-infected leaves weigh more than those of the control until the differentiation of the asci; after it, they have a clear drop up to the maturity of the asci, and a further revival at the end of the disease. (5) In the infected tissues, the content of free amino acids is always higher than in the control (with a maximum after sporulation), whereas in the non-infected ones it is generally lower. (6) The more important alterations in the pool of the free amino acids in invaded tissues consist in a scarcity, in percentage of the total, of alanine and glutamic acid, especially at the end of the disease, whereas proline, ornithine, glycine, and others increase, especially during the incubation period. In particular the glutamine–asparagines– threonine group reaches the highest value when sporulation has occurred. In the non-invaded tissues, the changes are more restricted. (7) The content of protein amino acids in infected tissues is generally lower than in the control, especially in the last phases of infection whereas in the non-invaded parts it is generally higher, except in differentiation of the asci. (8) In the infected tissue, the alterations of the quantitative relationships between the single protein amino acids (in percentage of the total) are not very great, but some diminutions and increases are recorded (diminution of alanine, glycine, leucine, etc.; increase of lysine, histidine, etc.); in the non-infected tissues, no noteworthy alterations were observed.

scholarly journals Free amino acids in the panicles of Dactylis glomerata in the course of their development

2015 ◽  
Vol 43 (1) ◽  
pp. 15-25
Author(s):  
T. Dąbrowska
Keyword(s):  
Amino Acids ◽  
Nitrogen Metabolism ◽  
Paper Chromatography ◽  
Free Amino Acids ◽  
Free Amino ◽  
Dactylis Glomerata ◽  
Proline Content ◽  
Proline Level

The composition of free amino acids and proline content in various parts of <i>Dactylis glomerata</i> panicles at different stages of their development were determined by paper chromatography and electrophoresis. The proline level in the spikelets was found to change widely in the course of their development. The results are discussed with reference to the role of proline in the nitrogen metabolism of plants.

scholarly journals Endogenous nitrogen metabolism and plasma free amino acids in young adults given a ‘protein-free’ diet

1968 ◽  
Vol 22 (1) ◽  
pp. 9-20 ◽  
Author(s):  
V. R. Young ◽  
N. S. Scrimshaw
Keyword(s):  
Amino Acids ◽  
Body Weight ◽  
Nitrogen Metabolism ◽  
Free Amino Acids ◽  
Free Amino ◽  
Essential Amino Acids ◽  
Whole Body ◽  
Protein Requirements ◽  
Protein Free Diet ◽  
Plasma Free Amino Acids

1. Variation in endogenous nitrogen metabolism was determined by giving eleven healthy men, aged 17–22, a diet supplying daily only 6 mg N/kg body-weight. Eight subjects were given the diet for 7–10 days and three other subjects were given it for 16 days.2. Body cell mass (BCM) was calculated from whole-body 40K in ten subjects and basal metabolism was determined in seven subjects during the ‘protein-free’ period. Urine was analysed daily for N and creatinine, and faecal N was measured in pooled samples. Plasma free amino acids, serum albumin and protein were measured in preprandial morning blood samples at the beginning and end of the study.3. BCM did not change during the ‘protein-free’ period and accounted for 48% of the total body-weight. Basal calorie expenditure amounted to 48 ± 5 kcal/kg BCM per day.4. Mean daily endogenous urinary N excretion in the eight subjects given the ‘protein-free’ diet for 7–10 days was 36·6 ± 3·0 mg N/kg body-weight, 79·4 ± 4·4 mg N/kg BCM and 1·6 ± 0·2 mg N/basal kcal. Endogenous faecal N excretion was 9·9 ± 1·1 mg N/kg body-weight and accounted for 20% of the total endogenous loss. Results obtained with three other subjects given the diet for 16 days were similar.5. Plasma essential amino acids were reduced, glutamic acid, alanine and glycine increased, and the ratio of essential to non-essential amino acids decreased after 7 or 10 days of ‘protein-free’ diet.6. The loss of endogenous N per basal kcal and of faecal N per kg body-weight was lower than the values assumed in the factorial approach to protein requirements by the FAO/WHO (1965) Expert Group on Protein Requirements.

Ion Chromatographic Analysis of Selected Free Amino Acids and Cations To Investigate the Change of Nitrogen Metabolism by Herbicide Stress in Soybean (Glycine max)

2001 ◽  
Vol 49 (1) ◽  
pp. 276-280 ◽  
Author(s):  
Minghong Jia ◽  
Norbert Keutgen ◽  
Shinpei Matsuhashi ◽  
Chizuko Mitzuniwa ◽  
Takehito Ito ◽  
...  
Keyword(s):  
Amino Acids ◽  
Glycine Max ◽  
Nitrogen Metabolism ◽  
Free Amino Acids ◽  
Chromatographic Analysis ◽  
Free Amino
Sign in / Sign up

Export Citation Format

Share Document