Surface Photochemistry of Adsorbed Nitrate: The Role of Adsorbed Water in the Formation of Reduced Nitrogen Species on α-Fe2O3 Particle Surfaces

2013 ◽  
Vol 118 (1) ◽  
pp. 158-166 ◽  
Author(s):  
Charith E. Nanayakkara ◽  
Pradeep M. Jayaweera ◽  
Gayan Rubasinghege ◽  
Jonas Baltrusaitis ◽  
Vicki H. Grassian
Keyword(s):  
Adsorbed Water ◽  
Nitrogen Species ◽  
Fe2o3 Particle ◽  
Reduced Nitrogen

Anti-toxicant Properties of Saffron and Relevance to Protection from Toxins and Drugs

2020 ◽  
Vol 16 (3) ◽  
pp. 265-283
Author(s):  
Kyriaki Hatziagapiou ◽  
George I. Lambrou
Keyword(s):  
Redox Reactions ◽  
Case Reports ◽  
Meta Analysis ◽  
Reactive Oxygen ◽  
Crocus Sativus ◽  
Protective Effects ◽  
Nitrogen Species ◽  
Eligibility Criteria ◽  
Crocus Sativus L

Background: Reactive oxygen species and reactive nitrogen species, which are collectively called reactive oxygen nitrogen species, are inevitable by-products of cellular metabolic redox reactions, such as oxidative phosphorylation in the mitochondrial respiratory chain, phagocytosis, reactions of biotransformation of exogenous and endogenous substrata in endoplasmic reticulum, eicosanoid synthesis, and redox reactions in the presence of metal with variable valence. Among medicinal plants there is a growing interest in Crocus sativus L. It is a perennial, stemless herb, belonging to Iridaceae family, cultivated in various countries such as Greece, Italy, Spain, Israel, Morocco, Turkey, Iran, India, China, Egypt and Mexico. Objective: The present study aims to address the anti-toxicant role of Crocus sativus L. in the cases of toxin and drug toxification. Materials and Methods: An electronic literature search was conducted by the two authors from 1993 to August 2017. Original articles and systematic reviews (with or without meta-analysis), as well as case reports were selected. Titles and abstracts of papers were screened by a third reviewer to determine whether they met the eligibility criteria, and full texts of the selected articles were retrieved. Results: The authors focused on literature concerning the role of Crocus Sativus L. as an anti-toxicant agent. Literature review showed that Saffron is a potent anti-toxicant agent with a plethora of applications ranging from anti-oxidant properties, to chemotherapy protective effects. Conclusion: Literature findings represented in current review herald promising results for using Crocus Sativus L. and/or its active constituents as anti-toxicant, chemotherapy-induced protection and toxin protection.

scholarly journals The role of adsorbed water on TiO2 particles in the electrorheological effect

AIP Advances ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 105319
Author(s):  
Zhaohui Qiu ◽  
Jing Huang ◽  
Rong Shen ◽  
Ying Wang ◽  
Xiaoyi Wu ◽  
...  
Keyword(s):  
Adsorbed Water ◽  
Tio2 Particles ◽  
Electrorheological Effect

The role of hydroxylated semiconducting surfaces in the reaction of 1,1-diphenyl-2-picrylhydrazyl with adsorbed water

Tetrahedron ◽  
1970 ◽  
Vol 26 (23) ◽  
pp. 5447-5451 ◽  
Author(s):  
D.N. Misra
Keyword(s):  
Adsorbed Water

The role of reactive oxygen and nitrogen species in cellular iron metabolism

2006 ◽  
Vol 40 (3) ◽  
pp. 263-272 ◽  
Author(s):  
PŘEMYSL MLADĚNKA ◽  
TOMÁŠ ŠIMŮNEK ◽  
MOJMÍR HÜBL ◽  
RADOMÍR HRDINA
Keyword(s):  
Iron Metabolism ◽  
Reactive Oxygen ◽  
Nitrogen Species ◽  
Cellular Iron

Phase distribution of oxidized and reduced nitrogen species in the ambient air

2001 ◽  
Vol 32 ◽  
pp. 243-318
Author(s):  
A. Held ◽  
O. Klemm
Keyword(s):  
Phase Distribution ◽  
Ambient Air ◽  
Nitrogen Species ◽  
Reduced Nitrogen

γ-Alumina and Amorphous Silica–Alumina: Structural Features, Acid Sites and the Role of Adsorbed Water

2017 ◽  
Vol 60 (19-20) ◽  
pp. 1554-1564 ◽  
Author(s):  
Vicente Sanchez Escribano ◽  
Gabriella Garbarino ◽  
Elisabetta Finocchio ◽  
Guido Busca
Keyword(s):  
Amorphous Silica ◽  
Adsorbed Water ◽  
Structural Features ◽  
Acid Sites ◽  
Silica Alumina

scholarly journals Lipoteichoic Acid from Staphylococcus aureus Induces Lung Endothelial Cell Barrier Dysfunction: Role of Reactive Oxygen and Nitrogen Species

PLoS ONE ◽  
2012 ◽  
Vol 7 (11) ◽  
pp. e49209 ◽  
Author(s):  
Amy Barton Pai ◽  
Heena Patel ◽  
Alexander J. Prokopienko ◽  
Hiba Alsaffar ◽  
Nancy Gertzberg ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Endothelial Cell ◽  
Reactive Oxygen ◽  
Lipoteichoic Acid ◽  
Nitrogen Species ◽  
Barrier Dysfunction

Photocatalytic mineralization of benzene over gold containing titania nanotubes: Role of adsorbed water and nanosize gold crystallites

2009 ◽  
Vol 141 (1-2) ◽  
pp. 144-151 ◽  
Author(s):  
S.V. Awate ◽  
R.K. Sahu ◽  
M.D. Kadgaonkar ◽  
R. Kumar ◽  
N.M. Gupta
Keyword(s):  
Adsorbed Water ◽  
Titania Nanotubes

Oxidising Role of Water Vapour in the 250 Kev D+ Induced Radiolysis of Polyimide Kapton-H

1988 ◽  
Vol 100 ◽  
Author(s):  
U. K. Chaturvedi ◽  
A. Patnaik ◽  
Ramji Pathak ◽  
R. N. Chakraborty ◽  
A. K. Nigam
Keyword(s):  
Partial Pressure ◽  
Water Vapour ◽  
Ion Beam ◽  
Adsorbed Water ◽  
Vacuum System ◽  
Residual Water ◽  
Implantation Time ◽  
Polymeric Surface ◽  
Imide Ring

Residual water vapour present in the vacuum system has been observed to play a dominant oxidising role in the 250 keV D+ induced radiolysis of polyimide (Kapton-H). The partial pressure (pp) of water in the vacuum system decreases sharply as the D+ beam impinges the polymeric surface, but soon after, it recovers to its initial value as the accumulated dose increases. Emission of CO2 is observed which has its maximum at a time when the H2O partial pressure is at a minimum. The CO2 level also returns to its original level with time. This complementary variation of CO2 and H2O confirms that absorbed and adsorbed water molecules are radiolysed by the ion beam and initiate oxidation of the radiolytically evolved CO to yield CO2 on and within the ion implanted surface of the polyimide. Further, the small enhancement in the 28 amu peak (N2 + CO), which exhibits no maximum/minimum over the entire implantation time, can be understood in terms of the evolution of N2 from the imide ring as a result of radiolysis of this nitrogen containing polymers.

scholarly journals Moisture Induced Degradation of Porous Low-k Materials

2006 ◽  
Vol 914 ◽  
Author(s):  
Mikhail Baklanov ◽  
David O'Dwyer ◽  
Adam M Urbanowicz ◽  
Quoc Toan Le ◽  
Steven Demuynck ◽  
...  
Keyword(s):  
Water Film ◽  
Internal Surface ◽  
Hydrophobic Surface ◽  
Adsorbed Water ◽  
Bulk Water ◽  
Oh Groups ◽  
Film Bulk ◽  
Low K

AbstractInteraction of moisture with porous low-k films is evaluated by using in situ ellipsometry setup. The adsorbed water amount is calculated from change of refractive index measured during the adsorption. Pristine low-k films reversibly adsorb 2 - 5% of water that reflects presence of constitutive hydrophilic centrums. Plasma and thermal treatments increase the number of hydrophilic centrums. Once the amount of these centrums has reached a certain critical value sufficient to form a continuous water film, bulk water condensation is observed. Change of properties during the water adsorption in the damaged films is not fully reversible. Each additional adsorption cycle increases the dielectric function of the film because of decreasing porosity, increasing skeleton density and shrinkage. The pressure corresponding to the bulk condensation allows us to calculate internal contact angle (internal surface energy) of low-k materials. The water molecules adsorbed on separate OH groups play the role of a catalyst that hydrolyses the siloxane bridges initially present on hydrophobic surface.

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