scholarly journals Agentes protectores contra hongos asociados a la semilla de pejibaye (Bactris gasipaes Kunth).

2006 ◽  
Vol 11 (1) ◽  
pp. 127
Author(s):  
Carlos Arroyo ◽  
Jorge Mora ◽  
Edgar Vargas ◽  
Javier Gainza
Keyword(s):  
Hydrogen Peroxide ◽  
Seed Germination ◽  
The Other ◽  
Bactris Gasipaes ◽  
Peach Palm ◽  
Other Hand ◽  
Germination Process

Non traditional alternatives for fungi control were tried on peach palm seed germination process. Two substances - kerosene and gasoline - were found as effective as traditional fungicide treatments triadime- fon and carboxin+benomyl. This is due to their fungicide action and posterior evaporation, not interfering with respiration as is the case with dieses oil. It was found that the hydrogen peroxide accelerates the germination process, but it is not an effective fungicide. On the other hand, kilol seem to be a promising fungicide in this respect if used at a concentration higher than 10 cc/l of water.

scholarly journals Morfología de semilla, germinación y desarrollo postemergente de tres especies del género Polianthes L. (Agavaceae)

2017 ◽  
pp. 55
Author(s):  
Héctor Serrano-Casas ◽  
Eloy Solano-Camacho ◽  
Adelaida Ocampo-López
Keyword(s):  
Seed Germination ◽  
Seed Dormancy ◽  
Seed Viability ◽  
Germination Percentage ◽  
Seed Morphology ◽  
Seedling Development ◽  
The Other ◽  
Viability Test ◽  
Other Hand ◽  
Germination Process

The seed germination process and seedling development were studied for Polianthes geminiflorn (Lex.) Rose var. geminiflom, Polianthes sp . and P. longiflom Rose. The seed viability test estimated was from 94 to 100%. In seeds treatment by soaking the seeds in water at 25ºC during three, six and twelve hours, the germination percentage, velocity and germination uniformity were increased like control assay. On the other hand, P geminiflorn var. geminiflora. were more resistent than Polianthes sp. and P.  longiflora. seeds to a treatment of three, six and twelve hours in water a t 40ºC. The three species had epigeal germination and their cotyledon developed a haustorium. None of this species exhibited seed dormancy and they were orthodox. There were significant differences in the first leave length between the three species. The seed morphology, germination behavior and seedlings development were very similar.

Decontamination Strategies for Filtering Facepiece Respirators (FFRs) in Healthcare Organizations: A Comprehensive Review

2020 ◽  
Author(s):  
Ashok Kumar Jena ◽  
Jitendra Sharan
Keyword(s):  
Hydrogen Peroxide ◽  
Ethylene Oxide ◽  
Time Use ◽  
Ultraviolet Irradiation ◽  
The Other ◽  
Limited Time ◽  
Healthcare Organizations ◽  
Comprehensive Review ◽  
Dry Heat ◽  
Other Hand

Abstract Filtering facepiece respirators (FFRs) are made for one-time use. A massive shortage of FFRs is widespread during pandemic events and has forced many healthcare organizations to decontaminate them and re-use for a limited time. Many decontamination methods have been proposed for the decontamination of FFRs. This review highlights various aspects of decontamination methods available in the literature. Among various methods available, vaporized hydrogen peroxide, ultraviolet irradiation, and dry heat seem to be the most promising decontaminants for FFRs. On the other hand, microwave, bleach, ethylene oxide, alcohol, hydrogen peroxide liquid, sanitizing wipes, and soap and water are not recommended methods for FFR decontamination.

scholarly journals The Effects of Hydrogen Peroxide on Plant Growth, Mineral Accumulation, as Well as Biological and Chemical Properties of Ficus deltoidea

Agronomy ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 599 ◽  
Author(s):  
Nik Nurnaeimah ◽  
Nashriyah Mat ◽  
Khamsah Suryati Mohd ◽  
Noor Afiza Badaluddin ◽  
Nornasuha Yusoff ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Antioxidant Activity ◽  
Chemical Properties ◽  
The Other ◽  
Mineral Nutrient ◽  
Flavonoid Content ◽  
Ficus Deltoidea ◽  
Other Hand ◽  
Mineral Accumulation ◽  
And Chemical Properties

Hydrogen peroxide (H2O2) is defined as a reactive oxygen species (ROS), able to cause damage to a variety of cellular structures. On the other hand, recent work has demonstrated that H2O2 can also act as a potent signaling molecule that mediates various physiological and biochemical processes in plants. This study was carried out to investigate the effects of H2O2 on the growth, mineral nutrient accumulation, as well as the biologic and chemical properties of Ficus deltoidea var. deltoidea. F. deltoidea plants were spray-treated with 0- (control), 8-, 16-, 30- and 60-mM H2O2 under field conditions. Plant height, leaf area, chlorophyll content, net photosynthetic rate, stomatal conductance and quantum yield of the F. deltoidea plants significantly increased after treatment with 16 and 30-mM H2O2. The results indicate that 60-mM H2O2 increased the accumulation of arsenic, iron and sodium content in the leaves of F. deltoidea. On the other hand, 8-mM H2O2 significantly enhanced the accumulation of arsenic, iron, calcium and potassium content in the syconium of F. deltoidea plants. In addition, H2O2 treatment did not produce any significant effects on antimony and magnesium accumulation in the leaves or the syconium of F. deltoidea plants. The results show that the F. deltoidea plant has strong antidiabetic properties and its α-glucosidase activity increased in treated plants compared to standard acarbose. Hydrogen peroxide, particularly in concentrations of 16 and 30 mM, increased the antioxidant activity, total phenolic and flavonoid content and the vitexin and isovitexin content. There was a positive correlation between antioxidant activity with total phenol and total flavonoid content in H2O2-treated plants. The quantitative analysis by HPTLC indicates that the amount of vitexin and isovitexin increased with the higher concentrations of H2O2. From this study, it can be concluded that spraying 16 and 30-mM H2O2 once a week enhances growth, mineral accumulation and stimulates bioactive compounds of the F. deltoidea plants.

scholarly journals STUDIES ON OXIDATION AND REDUCTION BY PNEUMOCOCCUS

1924 ◽  
Vol 39 (5) ◽  
pp. 745-755 ◽  
Author(s):  
Oswald T. Avery ◽  
James M. Neill
Keyword(s):  
Hydrogen Peroxide ◽  
Molecular Oxygen ◽  
Hemolytic Activity ◽  
Active Agent ◽  
Organic Peroxide ◽  
Cell Extract ◽  
The Other ◽  
Cell Extracts ◽  
Other Hand ◽  
The Stability

In the present work on oxidation and reduction by sterile extracts of pneumococcus, the preparations employed contain among other constituents, a hemolytic substance the properties of which have been described by Cole (1, 2) in his studies on pneumococcus hemotoxin. Pneumococcus extracts prepared by the methods described are actively hemolytic, 0.005 cc. of extract causing complete lysis of 2.5 cc. of a 1 per cent suspension of red cells from rabbit blood. This hemolytic property of pneumococcus extracts is destroyed by 10 minutes exposure to 55°C. When pneumotoxin-containing extracts are protected from the action of molecular oxygen, their hemolytic activity remains unimpaired for considerable periods of time. In the presence of air, on the other hand, the stability of the hemolytic substance depends upon whether the particular type of extract contains a "complete" or "incomplete" oxidation-reduction system. Sterile broth extracts of unwashed pneumococci are reactive with molecular oxygen, and as a result of this union peroxide is formed whenever these extracts are exposed to air. The hemolytic activity of "complete" extracts of this type is rapidly decreased and finally destroyed in the presence of molecular oxygen. On the other hand, the "incomplete" type of extract prepared by saline extraction of washed pneumococci may be exposed to air with little or no loss of hemolytic power. This "incomplete" washed cell extract, unless reactivated, does not undergo autoxidation in the presence of air; under these circumstances peroxide is not formed and the hemolytic activity of this type of extract is not impaired by exposure to air. The stability of the hemolytic agent in the "incomplete" type of extract is evidence that this substance is itself not reactive with or affected by molecular oxygen, even in the presence of the cell enzymes. The destruction of the same hemolytic substance in extracts capable of undergoing autoxidation may be ascribed to the action of some peroxide formed by the union of molecular oxygen with easily oxidized or autoxidizable substances of the extract. It is now known that a peroxide, having the reactions of hydrogen peroxide, accumulates in sterile pneumococcus extracts during oxidation. It has been shown in the present study that the addition of preformed hydrogen peroxide destroys the hemolytic activity of pneumococcus extracts, although higher concentrations were required than were detected in oxidized extracts themselves. These facts and the known action of superoxides in analogous types of reaction make it seem not unlikely that the active agent in the destruction of pneumotoxin in oxidized cell extracts may be a peroxide; either hydrogen peroxide or some higher organic peroxide formed during autoxidation of the extract.

Improvement in the SiO2/4H-SiC Interfacial Region by Thermal Treatments with Hydrogen Peroxide

2012 ◽  
Vol 717-720 ◽  
pp. 753-756
Author(s):  
Eduardo Pitthan ◽  
Silma A. Corrêa ◽  
Rodrigo Palmieri ◽  
Gabriel Vieira Soares ◽  
Henri I. Boudinov ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
The Other ◽  
Significant Alteration ◽  
Interfacial Region ◽  
Thermal Treatments ◽  
Other Hand

The effect of sequential thermal treatments with growth/removal steps of SiO2 films intercalated with hydrogen peroxide treatments on the SiO2/4H-SiC interfacial region thickness were investigated on both Si and C faces. In the Si face case, samples that were submitted to more H2O2 treatments presented thinner interfacial region thicknesses. In the C face case, on the other hand, no significant alteration in this region was observed.

scholarly journals Impacto potencial de la taltuza (Orthogeomys sp.) en el cultivo del pejibaye (Bactris gasipaes) en Costa Rica.

2006 ◽  
Vol 10 (2) ◽  
pp. 133
Author(s):  
Javier Monge
Keyword(s):  
Costa Rica ◽  
Geographical Distribution ◽  
The Other ◽  
Bactris Gasipaes ◽  
Pocket Gopher ◽  
Peach Palm ◽  
Distribution Maps ◽  
The One

The taltuzas (pocket gopher) (Orthogeomys sp.) are rodents that  plague several crops from USA to Panama. Peach palm (Bactris gasipaes) is a crop in expansion that overlaps in its geographical distribution with the one of Pocket gopher. Three patterns were found by superposing the distribution maps of rodents and palms. In one pattern only one organism was present but not the other whereas in two patterns rodents and palms were coincident. Since peach palm is attacked by the taltuzas, some considerations were discussed for each pattern in relation to future expansion of this crop.

Detoxification of Citrinin and Ochratoxin A by Hydrogen Peroxide

1994 ◽  
Vol 77 (3) ◽  
pp. 631-637 ◽  
Author(s):  
Sophie G Fouler ◽  
Alka B Trivedi ◽  
Naofumi Kitabatake
Keyword(s):  
Hydrogen Peroxide ◽  
Ochratoxin A ◽  
Hela Cells ◽  
Room Temperature ◽  
The Other ◽  
Toxic Compound ◽  
Other Hand ◽  
Alkaline Conditions

Abstract The effects of hydrogen peroxide on citrinin and ochratoxin A toxicity were examined using HeLa cells. The citrinin was completely detoxified by prior incubation with 0.05% hydrogen peroxide for 30 min at room temperature, and the toxic compound(s) that resulted from heating citrinin at 100°C were also detoxified upon reheating it with hydrogen peroxide. On the other hand, ochratoxin A was not detoxified by hydrogen peroxide at room temperature, but its toxicity was reduced by heating ochratoxin A with hydrogen peroxide under alkaline conditions.

scholarly journals Effects of gibberellic acid and Kn on seed germination and accumulation of Na+ and K+ in the seedlings of triticale-I under salinity stress

2013 ◽  
Vol 41 (2) ◽  
pp. 123-129 ◽  
Author(s):  
Rifat Samad ◽  
JL Karmoker
Keyword(s):  
Seed Germination ◽  
Gibberellic Acid ◽  
Salinity Stress ◽  
Growth Regulators ◽  
Ion Accumulation ◽  
The Other ◽  
Other Hand

Effects of GA and Kn on seed germination and accumulation of Na+ and K+ in the seedlings of Triticale cultivar was investigated under salinity stress. Salinity decreased the rate of seed germination and ion accumulation in the seedlings but both GA and Kn stimulated these processes under stress. Salinity increased the accumulation of Na+ in radicles and plumules with concomitant inhibition of that of K+, GA and Kn, on the other hand, reduced the rate of Na+ accumulation and increased that of K+ in the seedlings. The interrelationship between the effect of salinity and growth regulators on seed germination and the accumulation of Na+ and K+ in the seedlings is discussed. DOI: http://dx.doi.org/10.3329/bjb.v41i2.13435 Bangladesh J. Bot. 41(2): 123-129, 2012 (December)

scholarly journals Soluções crioprotetoras na conservação de sementes de orquídea estrela e orquídea bambu em nitrogênio líquido

2018 ◽  
Vol 24 (4) ◽  
pp. 341-346
Author(s):  
Jean Carlo Baudraz de Paula ◽  
Douglas Junior Bertoncelli ◽  
Guilherme Augusto Cito Alves ◽  
Gabriel Barraca Men ◽  
Tatiana Fattori Mathias ◽  
...  
Keyword(s):  
Seed Germination ◽  
Liquid Nitrogen ◽  
Survival Rates ◽  
The Other ◽  
Orchid Species ◽  
Other Hand ◽  
Significant Difference ◽  
Positive Effect ◽  
Tetrazolium Test

An alternative for the conservation of orchid species threatened with extinction is the seeds preservation for long periods by cryopreservation. This work aimed to evaluate the influence of cryogenic solutions on the orchids Epidendrum radicans and Arundina bambusifolia seeds cryopreservation in liquid nitrogen. Seven treatments were performed: 0.4 M sucrose; 2 M glycerol; PVS1; PVS2; PVS3; PVS2 + 1% phloroglucinol and the control. After liquid nitrogen removal, half of the seeds were subjected to tetrazolium test, and another half was in vitro cultured. After 30 days seed germination was evaluated. There was no significant difference between A. bambusifolia and E. radicans in tetrazolium test and seeds germination. On the other hand, it was observed that in A. bambusifolia tetrazolium and seed germination tests the solutions of PVS1, PVS2, PVS2 + 1% phloroglucinol showed the best results. E. radicans seeds with 4% water content cryopreservation does not require the use of cryoprotectant. On the other hand, cryoprotectant´s use resulted in positive effect in maintenance and viability preservation of A. bambusifolia seeds. PVS1, PVS2 and PVS2 + 1% phloroglucinol showed best seeds survival rates after cryopreservation in liquid nitrogen.

Reduction of ferrylmyoglobin in rat diaphragm

1990 ◽  
Vol 259 (6) ◽  
pp. C995-C997 ◽  
Author(s):  
L. Eddy ◽  
A. Arduini ◽  
P. Hochstein
Keyword(s):  
Skeletal Muscle ◽  
Hydrogen Peroxide ◽  
Muscle Damage ◽  
The Other ◽  
Rat Diaphragm ◽  
Rapid Reduction ◽  
Other Hand ◽  
Transmission Spectroscopy

The oxidation of myoglobin was monitored by transmission spectroscopy in isolated, superfused preparations of rat diaphragms. In its deoxygenated form, during anoxia, myoglobin was oxidized by adding hydrogen peroxide (1.0 mM) to its ferryl form (FeIV). On the other hand, peroxide-induced formation of ferrylmyoglobin was not observed when the perfusate contained oxygen. Ferrylmyoglobin was visualized after its derivatization with Na2S to form sulfmyoglobin. Depending on the time of addition, ascorbate (4.0 mM) or ergothioneine (2.0 mM) either prevented the formation of or dissipated ferrylmyoglobin. These agents are known to be reductants of this hypervalent form of myoglobin. In addition to providing the first demonstration of ferrylmyoglobin in skeletal muscle, these observations are consistent with the concept that oxidation of myoglobin to hypervalent states might be an important event in the initiation of muscle damage associated with anoxia and reoxygenation. The rapid reduction of myoglobin would prevent peroxidatic alterations of essential cellular constituents by ferrylmyoglobin.

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