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Jan 01, 2010 Dissolved oxygen (DO) in plant growth indicated essential to root formation and root growth (Soffer and Burger 1988). On tomatoes plant, the high oxygen treatment could increase in plant growth as measured by shoot and root weights (Cherif et al. 1997).
Our data suggest that increases in lipoxygenase activity detected in the present study in tomato roots grown under oxygen stress and inoculated with Pythium F may lead to degradation and disorganization of membrane lipids. That disorganization may facilitate root colonization by the pathogen and appearance of decay.
Journal of Plant Pathology, ... in which the growth of leaves and roots in lettuce and tomato plants increased as the concentration of ... the effect of
Dec 01, 1982 The effect of high O 2 concentration on photosynthetic 14 CO 12 assimilation and its 14 C-products in leaves of low temperature pretreated (cold-acclimated) rape plants was studied. The inhibition of photosynthesis (Warburg effect) and modification in photosynthetic carbon metabolism caused by O 2 were found to be less pronounced in the low temperature
The inhibition increases with oxygen concentration and is about 30% in an atmosphere of 21% O 2 and 0.03% Co. 2. Undoubtedly, therefore, oxygen in normal air exerts a strong inhibitory effect on photosynthetic Co 2 fixation of land plants under natural conditions. The inhibitory effect of oxygen is rapidly produced and fully reversible.
the ability to efficiently operate at high dissolved oxygen concentration and high MLSS level, provide specific economic and operational advantages of the HPOBNR System. Operating data will be presented from several high purity oxygen nutrient removal plants and provide a comparison of current generation design approach versus effluent. Get Price
disorders on some fruits. High O 2 concentrations enhance some of the effects of ethylene on fresh fruits and vegetables, including ripening, senescence, and ethylene-induced physiological disorders (such as bitterness of carrots and russet spotting on lettuce). While superatmospheric O 2 concentrations inhibit the growth of some bacteria and
At high concentration, H 2 O 2 can oxidize the cysteine (SH) or methionine residues (SCH 3), and inactivate enzymes by oxidizing their thiol groups, such as enzymes of Calvin cycle, Cu/Zn-SOD, and Fe-SOD .
As water stress, high deficiency of oxygen to plants in water logging soils causes root desiccation. When water logging is supported with high temperature, the roots rapidly collapse and die. It is because the water logging causes oxygen deficiency to roots while the high temperature increases oxygen demand by the plant creating its deficiency in roots.
concentrations are required. Conventionally the dissolved oxygen (DO) concentration is kept higher than 2 mg/l to avoid depletion of oxygen. In many plants DO concentrationis kept even higher to ensure good effluent quality since it has previously been shown that this has positive influence on the floc formation (Wiln and Balmr, 1999).
2 concentration may stimulate, have no effect, or reduce rates of respiration and ethylene production, depending on the commodity, maturity and ripeness stage, O 2 concentration, storage time and temperature, and concentrations of CO 2 and C 2 H 4 present in the atmosphere. In some plant organs, cyanide-resistant respiration is enhanced by ...
Reactive oxygen species (ROS) are produced as a normal product of plant cellular metabolism. Various environmental stresses lead to excessive production of ROS causing progressive oxidative damage and ultimately cell death. Despite their destructive activity, they are well-described second messengers in a variety of cellular processes, including conferment of
manufacturing plant or a power plant, raise the temperature of water and lower its oxygen content. Aquatic animals are most vulnerable to lowered dissolved oxygen levels in the early morning on hot summer days when stream ows are low, water temperatures are high, and aquatic plants have not begun producing oxygen.
It is because the water logging causes oxygen deficiency to roots while the high temperature increases oxygen demand by the plant creating its deficiency in roots. These effects together create extreme oxygen scarcity in roots and, as a result, they collapse and die, Blackheart of potato is an example of temperature.
Oct 13, 2021 The oxygen concentration of the bath Ringer under control conditions was air-saturated (270 mol/L) and was experimentally increased up to 1100 M and decreased to 40 mol/L by ventilation with carbogen (95% O 2, 5% CO 2) and nitrogen (N 2), respectively as described previously
Jun 17, 2016 The present study was conducted to assess the toxicity of thermal power plant effluent containing heavy metals (Fe Cu Zn Mn Ni Co Cr) on haematological indices, micronuclei, lobed nuclei and activity of pathological marker enzymes alkaline phosphatase (ALP), aspartate transferase (AST), alanine transferase (ALT) and creatine kinase (CK) in
Sep 04, 2019 It was revealed that the toxicity effects on aquatic organisms were due to short-term laboratory experiments where the carbon nanoparticles were at high concentrations. It was further observed that the degree of the toxicity depends on the type of the organism, exposition duration, and the method of carbon nanoparticle synthesis.
Mar 08, 2021 Nicotine is one of the most important compounds in cigarette which can cause changes in the concentration of neurotransmitters and damage to the nervous system. The aim of this study was to investigate the effect of the hydroalcoholic extract of iMedicago Sativa L/i. (alfalfa) on controlling nicotine-induced brain damage and anxiety behaviour in rats.
Blendor at high speed for 0.5 min) in 200 ml of Effect of oxygen concentration in vitro.-Oxygen sterile-distilled water. Numbers of conidia and MS in concentrations were decreased from 20.9% (normal air) portions of the suspension were determined with a to nearly zero (0.06%) while CO2 was held nearly constant
May 30, 2017 The effects of EOs on pathological targets of AD and dementia including amyloid deposition (A), neurofibrillary tangles (NFTs), cholinergic hypofunction, oxidative stress and glutamatergic abnormalities were focused. ... The chemical composition of EO was analyzed via GC-MS, indicating high concentration of spathulenol. A concentration ...
Dec 01, 2019 Two nonionic POEA surfactants (CAS No. 61791-26-2), TA15 and TH30, were tested to establish their acute pathological effects and lethal concentrations (LC50) in Piaractus brachypomus. Both compounds are nonionic surfactants produced by the alkoxylation of ethylene oxide with tallow amine, and they are used in variety of industries such as textiles, paints,
oxygen concentration. Oxygen levels between 0 percent (pure nitrogen) and 21 percent (air) were tested. Following a five day incubation period, rhizotrons were removed and the roots retraced. Treatment effects were determined by calculating the amount of root growth which occurred during the various oxygen treatments
Mar 01, 1997 Tomato plants were grown under either a high (11-14% Air treatment), a moderate (5.8-7% Control) or a low (0.8-1.5% Nitrogen treatment) oxygen concentration and inoculated or not with the pathogen. The high oxygen treatment resulted in a marked increase in plant growth, as measured by shoot and root weights.
Dec 01, 1997 Preliminary studies with plant cell suspensions indicated that high concentrations of bacterial inoculum can significantly reduce the H 2 O 2 levels detected immediately following inoculation. Further investigation suggested that bacterial concentration is an important factor in H 2 O 2-scavenging, and is often overlooked in both plant/pathogen interactions as well asin
H. Fock, H. Schaub, W. Hilgenberg, K. Egle, ber den Einflu niedriger und hoher O2-Partialdrucke auf den Sauerstoff- und Kohlendioxidumsatz von Amaranthus und Phaseolus w hrend der LichtphaseThe influence of low and high oxygen concentrations on oxygen and carbon dioxide gas exchange of Amaranthus and Phaseolus leaves during illumination, Planta ...
Oct 09, 2008 In woody plants, the threshold oxygen concentration for a reduction in root extension is about 50% of that of air, while root extension ceases at oxygen concentrations between 5 and 15% of that of air . Hypoxic conditions in the aeroponics chambers provided oxygen concentrations between 20 and 25% of that of air.
Thus high levels of BOD can deplete the oxygen in water. Near the point of organic discharge, the bacterial population rapidly increases with active growth of sewage fungus (Fig. 6.9). Protozoa species that feed on bacteria increase in numbers, but the oxygen depletion causes a decrease of algae and clean water fauna.
The dissolved oxygen concentration in the mix can be too low to support life in the pond. Both fish and plankton can die from low dissolved oxygen following a turnover. A turnover takes place only if the surface water is cooled quickly so that it is close to the temperature of the deep water, allowing them to mix.
Mar 08, 2021 Nicotine is one of the most important compounds in cigarette which can cause changes in the concentration of neurotransmitters and damage to the nervous system. The aim of this study was to investigate the effect of the hydroalcoholic extract of Medicago Sativa L . (alfalfa) on controlling nicotine-induced brain damage and anxiety behaviour in rats.
Effect of Dissolved Oxygen Concentration on Morphology and Settleability of Activated Sludge Flocs Melvin-Guy Adonadaga1,2,* ... operate at high SRTs the industrial plant at about 30 days and the municipal plants even higher. Each treatment plant was
Abstract. The effect of oxygen on photosynthesis depends on plant species and on some internal and environmental conditions. Oxygen inhibits the photosynthesis of C 3 plants at atmospheric CO 2 concentration (Warburg effect). The main cause of this phenomenon is the competitive inhibition of RuBP carboxylation and stimulation of RuBP oxygenation, the latter
Mar 24, 2005 The high H 2 O 2 concentration (500 nmol g 1 FW) in the tissues of plants pretreated with o-hydroxyethylorutin under B. cinerea conidial inoculation drops may have acted as a direct antimicrobial agent delaying spore germination, giving plants time to mobilize further defence reactions. Higher ROS generation in the tissues surrounding ...
This paper presents some recent studies on the influence of atmospheres, modified as to their oxygen level and temperature, on the storage life of Wickson plums. Nine temperatures (32-95 F) were used at each of ten oxygen levels (1-100 per cent). The results show that fruits reached respiration and ripening peaks fastest at 77 in the temperature series, although initial CO2
The elodea underwater plants can be purchased from a pet supply store, and a test tube can be borrowed from a high school science teacher or found in a toy chemistry set. Introduction Photosynthesis is the process by which plants use the energy in sunlight to synthesize material from air and water for growth.
Oct 09, 2008 Plants of a Eucalyptus marginata clone (1JN30) were grown in aeroponics chambers that could be sealed to allow the manipulation of oxygen levels in the root environment. Roots were grown for varying periods of hypoxia (0, 2, 5, 11 or 29 days) before being inoculated with zoospores of Phytophthora cinnamomi.A similar set of roots was