Activity of Antioxidant Enzymes of Cyanoprokaryota and Green Microalgae Cultures under Different Temperatures Conditions

2016 ◽  
Vol 18 (2) ◽  
pp. 169-177 ◽  
Author(s):  
A. V. Kureishevich ◽  
I. N. Nezbrytskaya ◽  
A. V. Stanislavchuk
Keyword(s):  
Antioxidant Enzymes ◽  
Green Microalgae ◽  
Different Temperatures

Influence of Brassinosteroids on Antioxidant Enzymes Activity in Tomato Under Different Temperatures

2002 ◽  
Vol 45 (4) ◽  
pp. 593-596 ◽  
Author(s):  
L.M. Mazorra ◽  
M. Nunez ◽  
M. Hechavarria ◽  
F. Coll ◽  
M.J. Sanchez-Blanco
Keyword(s):  
Antioxidant Enzymes ◽  
Enzymes Activity ◽  
Different Temperatures

scholarly journals Activity of antioxidant enzymes of cyanoprokaryota and green microalgae when culturing under different temperature conditions

Algologia ◽  
2016 ◽  
Vol 26 (2) ◽  
pp. 152-162
Author(s):  
A.V. Kureishevich ◽  
◽  
I.N. Nezbrytskaya ◽  
A.V. Stanislavchuk ◽  
◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Green Microalgae ◽  
Temperature Conditions

scholarly journals Effect of proline and salicylic acid on germination and antioxidant enzymes at different temperatures in Muskmelon (Cucumis melo L.) seeds

2017 ◽  
Vol 9 (4) ◽  
pp. 2165-2169 ◽  
Author(s):  
Sandeep Kaur ◽  
Namarta Gupta
Keyword(s):  
Superoxide Dismutase ◽  
Salicylic Acid ◽  
Antioxidant Enzymes ◽  
Cucumis Melo ◽  
Seed Treatments ◽  
Different Temperatures ◽  
Percent Germination ◽  
Anti Oxidant ◽  
Lower Temperature ◽  
Cucumis Melo L

Effect of different seed treatments hydration, warm water, proline (10mM and 20mM) and salicylic acid (0.1mM and 0.5mM) was investigated on percent germination and activity of antioxidant enzymes viz. superoxide dismutase (SOD), catalase (CAT) and peroxidase (POX) at different temperatures in Muskmelon (Cucumis melo L.) seeds. It was observed that lower temperature (20˚C) had decreased seed germination and activity of various anti-oxidant enzymes. Various seed treatments increased percent germination and activity of these enzymes as com-pared to control at both the temperatures. Proline 20mM (96.6) and SA 0.1mM (91.6) showed better results as com-pared to proline 10mM (95.0) and salicylic acid 0.5mM (86.6) respectively. Thus, proline and salicylic acid play an ameliorating role on low temperature stress by enhancing the activities of antioxidant enzymes and scavenging the free radicals.

Effects of Exogenous SA and H2O2 on Wheat-Seedling�s Antioxidant Enzymes in Different Temperatures

2020 ◽  
Vol 71 (6) ◽  
pp. 500-507
Author(s):  
Baoting Fang ◽  
Xiangdong Li ◽  
Simeng Du ◽  
Yunhui Shao ◽  
Hanfang Wang ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Compensation Effect ◽  
Wheat Seedling ◽  
Proline Content ◽  
Climate Chamber ◽  
H2o2 Treatment ◽  
Wheat Growth ◽  
Wheat Seedlings ◽  
Different Temperatures ◽  
Exogenous Salicylic Acid

In order to clarify the compensation effect of exogenous salicylic acid (SA) and H2O2 on wheat growth, this paper, by setting different growth temperatures in the artificial climate chamber, has studied the effects of antioxidant enzymes and proline content of wheat seedlings with spraying SA, hydrogen peroxide (H2O2) and SA+H2O2. The results show that catalase (CAT) activity, in 0 and 5 �C is lower than 10 and 15 �C, while the peroxidase (POD) activity is opposite. The activity of ascorbate peroxidase (APX) increases gradually with temperature increasing. Exogenous SA, H2O2, and SA+H2O2 could effectively improve the activity of wheat antioxidant enzymes and the content of proline (Pro), while the SA+H2O2 treatment improves obviously.

scholarly journals Germination Characteristics and Dynamic Changes of Antioxidant Enzymes during Storage of Viola dissecta Pollen

2021 ◽  
Vol 25 (04) ◽  
pp. 838-844
Author(s):  
Wenqing Jia
Keyword(s):  
Antioxidant Enzymes ◽  
Pollen Germination ◽  
Room Temperature ◽  
Storage Temperature ◽  
Germination Rate ◽  
Pollen Grains ◽  
Suitable Medium ◽  
Different Temperatures ◽  
Surface Ornamentation

Knowledge about pollen ultra-morphology, storage characteristics and germination rate are essential for directional plant breeding and plant improvement. The objective of this study was to determine a suitable medium for pollen germination in vitro of Viola dissecta and to evaluate the effect of different storage temperatures on its pollen longevity. The pollen ultra-morphology of V. dissecta was observed using scanning electron microscopy (SEM), the suitable medium for pollen germination in vitro was determined by orthogonal test. Dried pollen of V. dissecta was stored at different temperatures (room temperature, 4, -20 and -80°C) and different storage times (24, 40, 72, 120, 184, 264 and 365 d), the germination rate of the stored pollen and the activities of SOD, POD and CAT were investigated. Pollen grains of V. dissecta were medium-sized with three germination ditches. The surface ornamentation was smooth with small grains set on the surface, which was different from Viola spp. pollen. The most suitable medium for V. dissecta was composed of 285 g•L-1 sucrose, 6 g•L-1 agar, 50 mg•L-1 GA3, 250 mg•L-1 boric acid, and 200 mg•L-1 Ca(NO3)2, The best storage temperature of pollen was -80oC, after 365 d of storage, the germination rate was still 57.86%. During storage, the pollen germination rate decreased significantly after the peak of the activities of the three antioxidant enzymes. Correlation analysis showed that SOD was major factor affecting the germination rate of V. dissecta pollen, and it has a significant positive correlation with pollen germination rate, followed by CAT and POD. SOD was a sensitive antioxidant enzyme at room temperature, 4 and -80°C, whereas at -20°C, both SOD and CAT were sensitive antioxidant enzymes. © 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers © 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers© 2021 Friends Science Publishers©

scholarly journals Activity of antioxidant enzymes and proline accumulation in Erythrina velutina Willd. seeds subjected to abiotic stresses during germination

2014 ◽  
Vol 36 (2) ◽  
pp. 231-239 ◽  
Author(s):  
Renata Conduru Ribeiro ◽  
Janete Rodrigues Matias ◽  
Claudinéia Regina Pelacani ◽  
Bárbara França Dantas
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Enzymes ◽  
Abiotic Stresses ◽  
Proline Accumulation ◽  
Proline Content ◽  
Embryonic Axis ◽  
Distilled Water ◽  
Different Temperatures ◽  
Osmotic Potentials ◽  
Detoxification Process

The aim of this study was to evaluate the effect of different abiotic stresses on the activity of antioxidant enzymes and on accumulation of proline in Erythrina velutina Willd. seeds during germination. Mulungu seeds were scarified and placed to germinate at constant temperatures of 15, 25, and 35 ºC, moistened with distilled water, and exposed to 12 h of light. Other seeds were exposed to solutions of NaCl (EC of 0, 4, and 8 dS.m-1) and polyethylene glycol (osmotic potentials of 0.0, -0.2, and - 0.6 MPa) and maintained in a germination chamber set at 25 ºC and 12 h photoperiod for seven days. At the end of each period of imbibition, the embryonic axis and cotyledons of the seedlings were collected separately and used to quantify proline content and the activity of antioxidant enzymes. These were detected in both the cotyledons and embryonic axis of the mulungu seeds. Antioxidant activity varied depending upon the type and degree of stress applied. It was concluded that under the aspect of the detoxification process, the mechanism found in mulungu seeds is more efficient when subjected to different temperatures followed by salt stress and water stress.

Observations oh Nucleation and Growth of Voids in Nickel

1970 ◽  
Vol 28 ◽  
pp. 414-415
Author(s):  
J. L. Brimhall ◽  
H. E. Kissinger ◽  
B. Mastel
Keyword(s):  
High Purity ◽  
Growth Stage ◽  
Elevated Temperatures ◽  
Early Growth ◽  
Nucleation And Growth ◽  
Pure Nickel ◽  
Different Temperatures ◽  
Total Fluence ◽  
Neutron Exposure ◽  
Growth Of Voids

Some information on the size and density of voids that develop in several high purity metals and alloys during irradiation with neutrons at elevated temperatures has been reported as a function of irradiation parameters. An area of particular interest is the nucleation and early growth stage of voids. It is the purpose of this paper to describe the microstructure in high purity nickel after irradiation to a very low but constant neutron exposure at three different temperatures.Annealed specimens of 99-997% pure nickel in the form of foils 75μ thick were irradiated in a capsule to a total fluence of 2.2 × 1019 n/cm2 (E > 1.0 MeV). The capsule consisted of three temperature zones maintained by heaters and monitored by thermocouples at 350, 400, and 450°C, respectively. The temperature was automatically dropped to 60°C while the reactor was down.

The structure of membranes and membrane proteins embedded in amorphous ice

1992 ◽  
Vol 50 (1) ◽  
pp. 432-433
Author(s):  
Uwe Lücken ◽  
Joachim Jäger
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Membrane Proteins ◽  
Phase Transition Temperature ◽  
Lipid Vesicles ◽  
Freezing Stress ◽  
Amorphous Ice ◽  
Different Temperatures ◽  
Band Pass ◽  
Lipid Polymorphism

TEM imaging of frozen-hydrated lipid vesicles has been done by several groups Thermotrophic and lyotrophic polymorphism has been reported. By using image processing, computer simulation and tilt experiments, we tried to learn about the influence of freezing-stress and defocus artifacts on the lipid polymorphism and fine structure of the bilayer profile. We show integrated membrane proteins do modulate the bilayer structure and the morphology of the vesicles.Phase transitions of DMPC vesicles were visualized after freezing under equilibrium conditions at different temperatures in a controlled-environment vitrification system. Below the main phase transition temperature of 24°C (Fig. 1), vesicles show a facetted appearance due to the quasicrystalline areas. A gradual increase in temperature leads to melting processes with different morphology in the bilayer profile. Far above the phase transition temperature the bilayer profile is still present. In the band-pass-filtered images (Fig. 2) no significant change in the width of the bilayer profile is visible.

Microstructure of sputter deposited Ni-Sb ohmic contacts on GaAs

1989 ◽  
Vol 47 ◽  
pp. 450-451
Author(s):  
S. Yegnasubramanian ◽  
V.C. Kannan ◽  
R. Dutto ◽  
P.J. Sakach
Keyword(s):  
High Performance ◽  
Ohmic Contacts ◽  
Surface Defects ◽  
Pure Metal ◽  
Device Fabrication ◽  
Native Oxide ◽  
Metal Thin Films ◽  
Recent Developments ◽  
Different Temperatures ◽  
Sputter Deposited

Recent developments in the fabrication of high performance GaAs devices impose crucial requirements of low resistance ohmic contacts with excellent contact properties such as, thermal stability, contact resistivity, contact depth, Schottky barrier height etc. The nature of the interface plays an important role in the stability of the contacts due to problems associated with interdiffusion and compound formation at the interface during device fabrication. Contacts of pure metal thin films on GaAs are not desirable due to the presence of the native oxide and surface defects at the interface. Nickel has been used as a contact metal on GaAs and has been found to be reactive at low temperatures. Formation Of Ni2 GaAs at 200 - 350C is reported and is found to grow epitaxially on (001) and on (111) GaAs, but is shown to be unstable at 450C. This paper reports the investigations carried out to understand the microstructure, nature of the interface and composition of sputter deposited and annealed (at different temperatures) Ni-Sb ohmic contacts on GaAs by TEM. Attempts were made to correlate the electrical properties of the films such as the sheet resistance and contact resistance, with the microstructure. The observations are corroborated by Scanning Auger Microprobe (SAM) investigations.

Effects of Antioxidant Supplementation and Exercise Training on Erythrocyte Antioxidant Enzymes

2006 ◽  
Vol 76 (5) ◽  
pp. 324-331 ◽  
Author(s):  
Marsh ◽  
Laursen ◽  
Coombes
Keyword(s):  
Antioxidant Enzymes ◽  
Exercise Training ◽  
Endurance Training ◽  
Young Male ◽  
Antioxidant Defenses ◽  
Antioxidant Enzyme Activities ◽  
Antioxidant Supplementation ◽  
Male Wistar Rats ◽  
Exercise Induced ◽  
Antioxidant Supplements

Erythrocytes transport oxygen to tissues and exercise-induced oxidative stress increases erythrocyte damage and turnover. Increased use of antioxidant supplements may alter protective erythrocyte antioxidant mechanisms during training. Aim of study: To examine the effects of antioxidant supplementation (α-lipoic acid and α-tocopherol) and/or endurance training on the antioxidant defenses of erythrocytes. Methods: Young male Wistar rats were assigned to (1) sedentary; (2) sedentary and antioxidant-supplemented; (3) endurance-trained; or (4) endurance-trained and antioxidant-supplemented groups for 14 weeks. Erythrocyte superoxide dismutase (SOD), glutathione peroxidase (GPX), and catalase (CAT) activities, and plasma malondialdehyde (MDA) were then measured. Results: Antioxidant supplementation had no significant effect (p > 0.05) on activities of antioxidant enzymes in sedentary animals. Similarly, endurance training alone also had no effect (p > 0.05). GPX (125.9 ± 2.8 vs. 121.5 ± 3.0 U.gHb–1, p < 0.05) and CAT (6.1 ± 0.2 vs. 5.6 ± 0.2 U.mgHb–1, p < 0.05) activities were increased in supplemented trained animals compared to non-supplemented sedentary animals whereas SOD (61.8 ± 4.3 vs. 52.0 ± 5.2 U.mgHb–1, p < 0.05) activity was decreased. Plasma MDA was not different among groups (p > 0.05). Conclusions: In a rat model, the combination of exercise training and antioxidant supplementation increased antioxidant enzyme activities (GPX, CAT) compared with each individual intervention.

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