Efficient callus initiation from leaf of mangrove plant,Bruguiera sexangula in amino acid medium: Effect of NaCl on callus initiation

1997 ◽  
Vol 110 (1) ◽  
pp. 25-29 ◽  
Author(s):  
Tetsuro Mimura ◽  
Mari Mimura ◽  
Setsuko Washitani-Nemoto ◽  
Katsuhiro Sakano ◽  
Teruo Shimmen ◽  
...  
Keyword(s):  
Amino Acid ◽  
Acid Medium ◽  
Medium Effect ◽  
Mangrove Plant ◽  
Callus Initiation

A Study of Substituent Effect on the Oxidative Strengths of N-Chloroarenesulphonamides: Kinetics of Oxidation of Leucine and Isoleucine in Aqueous Acid Medium

2004 ◽  
Vol 59 (1) ◽  
pp. 63-72 ◽  
Author(s):  
Mahesha Shetty ◽  
B. Thimme Gowda
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Ionic Strength ◽  
Acid Medium ◽  
Benzene Ring ◽  
Thermodynamic Data ◽  
Substituent Effect ◽  
Kinetics Of Oxidation ◽  
Aqueous Acid ◽  
Kinetics Of

Abstract To study the variation of oxidative strengths of N-chloro-arenesulphonamides with substitution in the benzene ring, six mono- and five di-substituted N-chloro-arenesulphonamides are employed as oxidants for studying the kinetics of oxidation of two neutral amino acids, L-leucine and Lisoleucine in aqueous acid medium. The N-chloro-arenesulphonamides studied are of the constitution: ArSO2NaNCl·H2O (where Ar = C6H5, 4-CH3C6H4, 4-C2H5C6H4, 4-FC6H4, 4-ClC6H4, 4-BrC6H4, 2,3-(CH3)2C6H3, 2,4-(CH3)2C6H3, 2-CH3-4-ClC6H3, 2,4-Cl2C6H3, and 3,4-Cl2C6H3). The reactions show second order kinetics in [oxidant], fractional order in [amino acid] and inverse dependence on [H+]. Addition of the reduced product of the oxidants or variation in ionic strength of the medium has no significant effect on the rates of oxidations. A two-pathway mechanism is considered to explain the experimental results. Effective oxidizing species of the oxidants is Cl+ in different forms. Therefore the oxidising strengths of N-chloro-arenesulphonamides depend on the ease with which Cl+ is released from them. The study reveals that the introduction of substituent in the benzene ring of the oxidant affects both the kinetic and thermodynamic data for the oxidations The electron releasing groups such as CH3 generally inhibit the rates, while electron-withdrawing groups such as Cl enhance this ability, as the electron withdrawing groups ease the release of Cl+ from the reagents and hence increase the oxidising strengths. The on Ea and logA and validity of the Hammett and isokinetic relationships for the oxidations are also analysed.

Formation of abnormal mycelium ofFusarium roseum link. on a modified Czapek-d-amino acid medium

1968 ◽  
Vol 24 (4) ◽  
pp. 403-404 ◽  
Author(s):  
H. Egawa ◽  
M. Tsuda ◽  
A. Ueyama ◽  
T. Matuo
Keyword(s):  
Amino Acid ◽  
Acid Medium

Dissolution of PuO2 in Hydrochloric Acid Medium—Effect of Reducing Agents

1989 ◽  
Vol 88 (3) ◽  
pp. 290-293 ◽  
Author(s):  
Mrs. Shakila Abdul Majeed ◽  
Thandangorai Ganapathi Srinivasan ◽  
Kanwal Nain Sabharwal
Keyword(s):  
Hydrochloric Acid ◽  
Acid Medium ◽  
Reducing Agents ◽  
Medium Effect ◽  
Hydrochloric Acid Medium

Voltammetric and subtractively normalized interfacial FTIR study of the adsorption and oxidation ofL(+)-ascorbic acid on Pt electrodes in acid medium: effect of Bi adatoms

1994 ◽  
Vol 90 (4) ◽  
pp. 609-615 ◽  
Author(s):  
Miguel A. Climent ◽  
Antonio Rodes ◽  
Maria J. Valls ◽  
Juan M. Pérez ◽  
Juan M. Feliu ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Acid Medium ◽  
Medium Effect ◽  
Ftir Study ◽  
Pt Electrodes

scholarly journals The Amino Acid Contents in Mangrove Rhizophora mucronata Leaves in Asahan, North Sumatra, Indonesia

2020 ◽  
Vol 151 ◽  
pp. 01047
Author(s):  
Sri S. Ningsih ◽  
Dafit Ariyanto ◽  
Dian Puspitasari ◽  
Anuraga Jayanegara ◽  
Hamim Hamim ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Glutamic Acid ◽  
Amino Acid Content ◽  
Principal Component ◽  
Mangrove Plant ◽  
Relationship Analysis ◽  
The Difference ◽  
Amino Acid Contents ◽  
The Relationship

Amino acids are important components of mangrove plant metabolisms. The aim of this study was to determine the relationship of mangrove R. mucronata leaf colors to the amino acid content. This study was conducted between March to August 2019. The leaves were taken 50 g. The assessment of Amino acids was conducted using UPLC Waters Acquity Class H with PDA Detector. The principal component analysis (PCA) was used to determine the relationship analysis between R. mucronata leaf colors and amino acid concentrations. The largest content was L glutamic acid with a green leaf content of 6139.57 ± 694.17 mg/kg and yellow leaf content of 6105.013 ± 113.2058 mg/kg. The results of PCA 1 showed that the influential amino acids were L-threonine (0.94), L-tyrosine (0.96), L-alanine (0.92), L-vanin (0.93), and PCA 2 showed glutamic acid (0.91). These results indicated that the difference in mangrove leaf colors affects the amino acid contents in the leaves.

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