scholarly journals Effects of Sudden Drop in Salinity on Osmotic Pressure Regulation and Antioxidant Defense Mechanism of Scapharca subcrenata

2020 ◽  
Vol 11 ◽  
Author(s):  
Zhang Mo ◽  
Li Li ◽  
Liu Ying ◽  
Gao Xiaolong
Keyword(s):  
Osmotic Pressure ◽  
Antioxidant Defense ◽  
Defense Mechanism ◽  
Pressure Regulation ◽  
Sudden Drop ◽  
Scapharca Subcrenata

scholarly journals Responses of Peppermint and Spearmint Crops to Excessive Biostimulant Application and Increased Salinity in a Closed Soilless Production System

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1168
Author(s):  
Dimitrios S. Kasampalis ◽  
Danai-Christina Aktsoglou ◽  
Pavlos Tsouvaltzis ◽  
Anastasios S. Siomos
Keyword(s):  
Amino Acid ◽  
Osmotic Stress ◽  
Antioxidant Defense ◽  
Defense Mechanism ◽  
Substantial Improvement ◽  
Oxygen Species ◽  
Floating System ◽  
High Salt Tolerance ◽  
Heated Glass ◽  
Nutrient Solutions

A floating system was established in a heated glass greenhouse in order to investigate whether the effect of amino acids (0.25 or 0.50% of a commercial amino acid (AA) solution Amino16®) during peppermint and spearmint production on plant developmental and nutritional status may be in part attributed to salinity induced osmotic stress. For this reason, in some nutrient solutions, three levels of salinity were induced by adding 0, 10, or 20 mM NaCl. According to the results, it can be concluded that spearmint is mostly favored by the highest amino acid supplement of the nutrient solution (0.50%) in terms of a substantial improvement of the antioxidant nutritional quality (by up to 130%) at the expense of a reduced biomass production (by <30%). Enzymic antioxidant defense mechanism (APX and POD) was efficiently activated, preventing severe lipid peroxidation and the accumulation of reactive oxygen species such as H2O2 and maintaining the proline content at the normal levels. The osmotic stress that was induced by the excessive AA concentration and confirmed by the chlorophyl fluorescence variations was probably related to NH4+ excess supply in the growing media and was not associated with the elevated electrical conductivity in the solution. The absence of any adverse stressful consequences upon the addition of 20 mM NaCl may be attributed to the high salt tolerance of peppermint and spearmint species.

Effect of fibrin glue on antioxidant defense mechanism, oxidative DNA damage and chromosomal aberrations

2013 ◽  
Vol 23 (7) ◽  
pp. 500-508 ◽  
Author(s):  
V. S. Anjana Vaman ◽  
S. K. Tinu ◽  
C. S. Geetha ◽  
K. K. Lissy ◽  
P. V. Mohanan
Keyword(s):  
Dna Damage ◽  
Fibrin Glue ◽  
Chromosomal Aberrations ◽  
Oxidative Dna Damage ◽  
Antioxidant Defense ◽  
Defense Mechanism

In vitro evaluation of antioxidant defense mechanism and hemocompatibility of mauran

2013 ◽  
Vol 98 (1) ◽  
pp. 108-115 ◽  
Author(s):  
Sreejith Raveendran ◽  
Vivekanandan Palaninathan ◽  
Neha Chauhan ◽  
Yasushi Sakamoto ◽  
Yasuhiko Yoshida ◽  
...  
Keyword(s):  
Antioxidant Defense ◽  
Defense Mechanism ◽  
In Vitro Evaluation

Biodegradation of hydrolyzed polyacrylamide by a Bacillus megaterium strain SZK-5: Functional enzymes and antioxidant defense mechanism

Chemosphere ◽  
2019 ◽  
Vol 231 ◽  
pp. 184-193 ◽  
Author(s):  
Tianwen Song ◽  
Shanshan Li ◽  
Yifeng Lu ◽  
Dong Yan ◽  
Peiyan Sun ◽  
...  
Keyword(s):  
Bacillus Megaterium ◽  
Antioxidant Defense ◽  
Defense Mechanism ◽  
Hydrolyzed Polyacrylamide

scholarly journals NADPH oxidase-derived H2O2 subverts pathogen signaling by oxidative phosphotyrosine conversion to PB-DOPA

2016 ◽  
Vol 113 (37) ◽  
pp. 10406-10411 ◽  
Author(s):  
Luis A. Alvarez ◽  
Lidija Kovačič ◽  
Javier Rodríguez ◽  
Jan-Hendrik Gosemann ◽  
Malgorzata Kubica ◽  
...  
Keyword(s):  
Antioxidant Defense ◽  
Defense Mechanism ◽  
Host Immune System ◽  
Low Oxygen ◽  
Radical Intermediate ◽  
Polysaccharide Biosynthesis ◽  
Bacterial Signaling ◽  
Bacterial Fitness ◽  
Containment Strategy ◽  
Number Of Bacteria

Strengthening the host immune system to fully exploit its potential as antimicrobial defense is vital in countering antibiotic resistance. Chemical compounds released during bidirectional host–pathogen cross-talk, which follows a sensing-response paradigm, can serve as protective mediators. A potent, diffusible messenger is hydrogen peroxide (H2O2), but its consequences on extracellular pathogens are unknown. Here we show that H2O2, released by the host on pathogen contact, subverts the tyrosine signaling network of a number of bacteria accustomed to low-oxygen environments. This defense mechanism uses heme-containing bacterial enzymes with peroxidase-like activity to facilitate phosphotyrosine (p-Tyr) oxidation. An intrabacterial reaction converts p-Tyr to protein-bound dopa (PB-DOPA) via a tyrosinyl radical intermediate, thereby altering antioxidant defense and inactivating enzymes involved in polysaccharide biosynthesis and metabolism. Disruption of bacterial signaling by DOPA modification reveals an infection containment strategy that weakens bacterial fitness and could be a blueprint for antivirulence approaches.

Oxidative Stress and Antioxidant Defense Mechanism in Glomerular Diseases

1997 ◽  
Vol 22 (1-2) ◽  
pp. 161-168 ◽  
Author(s):  
Sándor Túri ◽  
Ilona Németh ◽  
Attila Torkos ◽  
Levente Sághy ◽  
Ilona Varga ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Defense ◽  
Defense Mechanism ◽  
Glomerular Diseases
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