scholarly journals Initial Growth of Some Crops Grown in Amino Acid as Nitrogen Source under Aseptic Condition

2012 ◽  
Vol 81 (2) ◽  
pp. 194-200 ◽  
Author(s):  
Naoto Nihei ◽  
Sayaka Masuda ◽  
Keitaro Tanoi ◽  
Hiroki Rai ◽  
Tomoko M. Nakanishi
Keyword(s):  
Amino Acid ◽  
Nitrogen Source ◽  
Initial Growth ◽  
Aseptic Condition

Access to 2-Arylquinazolines via Catabolism/Reconstruction of Amino Acids with Insertion of Dimethyl Sulfoxide

2021 ◽  
Author(s):  
Jin-Tian Ma ◽  
Li-Sheng Wang ◽  
Zhi Chai ◽  
Xin-Feng Chen ◽  
Bo-Cheng Tang ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Dimethyl Sulfoxide ◽  
Nitrogen Source ◽  
Carbon And Nitrogen ◽  
First Time

Quinazoline skeletons are synthesized by amino acids catabolism/reconstruction combined with dimethyl sulfoxide insertion/cyclization for the first time. The amino acid acts as a carbon and nitrogen source through HI-mediated catabolism...

The effect of pH and amino acids on conidiation and pigment production of Monascus major ATCC 16362 and Monascus rubiginosus ATCC 16367 in submerged shaken culture

1978 ◽  
Vol 24 (11) ◽  
pp. 1346-1357 ◽  
Author(s):  
Mariette Carels ◽  
David Shepherd
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Nitrogen Source ◽  
Yeast Extract ◽  
Amino Acid Mixture ◽  
Pigment Production ◽  
Ammonium Uptake ◽  
Acid Mixture ◽  
Medium Components ◽  
Conidial Formation

Monascus major ATCC 16362 and Monascus rubiginosus ATCC 16367 were cultivated aerobically on media containing nitrate or ammonium as nitrogen source to which the following modifications were made: (1) pH adjusted to 2.5 before sterilization; (2) addition of yeast extract; (3) addition of amino acids in identical proportions and concentrations to those found in yeast extract; (4) adjustment of pH to 2.5 after addition of amino acids.The addition of amino acids in the form of yeast extract increased mycelium formation and reduced conidiation and pigment production. The addition of an amino acid mixture did not increase mycelium formation to the same extent as yeast extract but increased the number of conidia, while pigment production was reduced, especially when nitrate was the nitrogen source. As the amino acids are taken up after conidial formation has started, it would appear that it is not the amino acids themselves which are directly responsible for the induction of conidiation. The addition of amino acids inhibits nitrate and ammonium uptake suggesting the need for an early intracellular nitrogen limitation to induce conidiation. Lowering the pH inhibits the formation of conidia and increases pigment production; also the effect of amino acid addition is totally annulled.The pH of the medium is all important in regulating the formation of conidia and pigment production. The possible effects of the pH on the uptake of certain medium components is discussed, as well as their possible control of certain metabolic pathways which ultimately determines the availability of intermediates for conidiation and pigment production.

AMINO ACIDS AND UTILIZATION OF SODIUM CASEINATE BY LACTIC STREPTOCOCCI

1957 ◽  
Vol 3 (3) ◽  
pp. 487-491 ◽  
Author(s):  
I. Husain ◽  
I. J. McDonald
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Nitrogen Source ◽  
Sodium Caseinate ◽  
Amino Acid Requirements ◽  
Sparing Effect

The ability of strains of lactic streptococci to utilize unhydrolyzed sodium caseinate as the nitrogen source in an otherwise complete, chemically denned medium did not appear to be related to their minimal amino acid requirements. Sodium caseinate had a sparing effect on the requirement for some amino acids of some strains of streptococci that did not use caseinate, but the amino acids spared varied with the strain. However, leucine, isoleucine, methionine, and valine appeared to be essential for this group of organisms in the presence or absence of sodium caseinate.

scholarly journals Amino Acid Catabolism by an areA-Regulated Gene Encoding an l-Amino Acid Oxidase with Broad Substrate Specificity in Aspergillus nidulans

2005 ◽  
Vol 71 (7) ◽  
pp. 3551-3555 ◽  
Author(s):  
Meryl A. Davis ◽  
Marion C. Askin ◽  
Michael J. Hynes
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Substrate Specificity ◽  
Nitrogen Source ◽  
Aspergillus Nidulans ◽  
Nitrogen Sources ◽  
Acid Oxidase ◽  
Amino Acid Oxidase ◽  
Broad Substrate Specificity ◽  
Strong Growth

ABSTRACT The filamentous fungus Aspergillus nidulans can use a wide range of compounds as nitrogen sources. The synthesis of the various catabolic enzymes needed to breakdown these nitrogen sources is regulated by the areA gene, which encodes a GATA transcription factor required to activate gene expression under nitrogen-limiting conditions. The areA102 mutation results in pleiotropic effects on nitrogen source utilization, including better growth on certain amino acids as nitrogen sources. Mutations in the sarA gene were previously isolated as suppressors of the strong growth of an areA102 strain on l-histidine as a sole nitrogen source. We cloned the sarA gene by complementation of a sarA mutant and showed that it encodes an l-amino acid oxidase enzyme with broad substrate specificity. Elevated expression of this enzyme activity in an areA102 background accounts for the strong growth of these strains on amino acids that are substrates for this enzyme. Loss of function sarA mutations, which abolish the l-amino acid oxidase activity, reverse the areA102 phenotype. Growth tests with areA102 and sarA mutants show that this enzyme is the primary route of catabolism for some amino acids, while other amino acids are metabolized through alternative pathways that yield either ammonium or glutamate for growth.

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
Sign in / Sign up

Export Citation Format

Share Document