PubMed Journals Articles About "Hydrogen Peroxide" RSS

11:21 EDT 23rd July 2018 | BioPortfolio

Hydrogen Peroxide PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Hydrogen Peroxide articles that have been published worldwide.

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Showing "Hydrogen Peroxide" PubMed Articles 1–25 of 2,100+

Generation of superoxide and hydrogen peroxide by side reactions of mitochondrial 2-oxoacid dehydrogenase complexes in isolation and in cells.

Mitochondrial 2-oxoacid dehydrogenase complexes oxidize 2-oxoglutarate, pyruvate, branched-chain 2-oxoacids and 2-oxoadipate to the corresponding acyl-CoAs and reduce NAD+ to NADH. The isolated enzyme complexes generate superoxide anion radical or hydrogen peroxide in defined reactions by leaking electrons to oxygen. Studies using isolated mitochondria in media mimicking cytosol suggest that the 2-oxoacid dehydrogenase complexes contribute little to the production of superoxide or hydrogen peroxide relative...

Hydrogen peroxide extracellular concentration in the ventrolateral medulla and its increase in response to hypoxia in vitro: possible role of microglia.

Hydrogen peroxide (HO) is a messenger involved in both damaging neuroinflammatory responses and physiological cell communication. The ventrolateral medulla, which regulates several vital functions including breathing and blood pressure, is highly influenced by hydrogen peroxide, whose extracellular levels could be determined by hypoxia and microglial activity, both of which modulate ventrolateral medulla function. Therefore, in this study we aimed to test whether different patterns of hypoxia and/or putativ...

In-Office Tooth Bleaching for Adolescents Using Hydrogen Peroxide-Based Gels: Clinical Trial.

The aim of the present study was to evaluate colorimetric changes and tooth sensitivity in adolescents and young patients submitted to tooth bleaching with 20% and 35% hydrogen peroxide. A randomized, controlled, clinical trial was conducted with 53 patients aged 11 to 24 years who were allocated to groups based on the use of the following commercial products: Whiteness HP - FGM® (35% hydrogen peroxide); Whiteness HP Blue Calcium - FGM® (35% hydrogen peroxide); and Whiteness HP Blue Calcium - FGM® (20% h...

Effectiveness of and Dental Sensitivity to At-home Bleaching With 4% and 10% Hydrogen Peroxide: A Randomized, Triple-blind Clinical Trial.

To evaluate the risk for and intensity of tooth sensitivity and color change of at-home dental bleaching with 4% and 10% hydrogen peroxide (HP).

Design and Synthesis of a BODIPY-Tetrazole Based "Off-On" In-Cell Fluorescent Reporter of Hydrogen Peroxide.

The BODIPY-linked bithiophene-tetrazoles were designed and synthesized for bioorthogonal photoclick reactions in vitro and in vivo. The reactivity of these tetrazoles toward dimethyl fumarate was found to depend on BODIPY attachment site, with the meta-linked BODIPY-tetrazole being the most reactive. The resulting BODIPY-pyrazolines showed drastically reduced BODIPY fluorescence. Interestingly, the BODIPY fluorescence recovered after treatment with hydrogen peroxide, which was attributed to the conversion f...

Hydrogen Peroxide Induced Colitis: A Case Report and Literature Review.

Constipation is a common condition. Hydrogen peroxide enemas have rarely been reported as a home remedy for constipation in the pediatric age group. We present a case report and literature review of hydrogen peroxide induced colitis in pediatric siblings, aged 2 years and 9 years. The siblings presented with vomiting and bloody diarrhea an hour following the enema. Physical exam, vital signs, blood, and electrolyte counts were normal, but CT scans showed mucosal thickening of the rectum and colon. Their sym...

Effectiveness of In-office Hydrogen Peroxide With Two Different Protocols: A Two-center Randomized Clinical Trial.

The aim of this study was to compare the bleaching efficacy and tooth sensitivity (TS) of a 38% hydrogen peroxide bleaching agent used for in-office bleaching, applied under different time protocols: a 40-minute application or two 20-minute applications.

Double-blind Randomized Study to Evaluate the Safety and Efficacy of Over-the-counter Tooth-whitening Agents Containing 2.9% Hydrogen Peroxide.

In this double-blind randomized study, we evaluated the safety and efficacy of over-the-counter (OTC) bleaching products that included 2.9% hydrogen peroxide (HO) with two methods of application: strip and paint-on.

Blood hydrogen peroxide break-down activity in healthy subjects and in patients at risk of cardiovascular events.

Antioxidant status has been shown to be associated with cardiovascular events (CVEs). The aim of the study was to develop an assay measuring serum hydrogen peroxide (HO) break-down activity (HBA) of healthy subjects (HS) and to validate it in a cohort of patients with atrial fibrillation (AF).

A colorimetric evaluation of the effect of bacterial contamination on teeth stained with blood in vitro; evaluation of the efficacy of two different bleaching regimes.

Tooth discolouration could occur due to bacterial contamination in traumatised teeth. Hydrogen peroxide is the commonly used bleaching agent. However, due to concerns over safety, alternative-bleaching regimes such as sodium perborate (S) and thiourea-hydrogen peroxide (T) have been investigated.

A label-free fluorescence assay for hydrogen peroxide and glucose based on the bifunctional MIL-53(Fe) nanozyme.

A label-free nanozyme MIL-53(Fe) with the dual-function of catalyzing and emitting fluorescence was utilized for turn-on fluorescence detection of hydrogen peroxide and glucose. The proposed strategy provides a cost-effective, safe and sensitive method for the design and development of multiple enzyme cascade assays for various biomolecules.

Combined treatment of toxic cyanobacteria Microcystis aeruginosa with hydrogen peroxide and microcystin biodegradation agents results in quick toxin elimination.

Under some conditions the growth of toxic cyanobacteria must be controlled by treatment with algicidal compounds. Hydrogen peroxide has been proposed as an efficient and relatively safe chemical which can remove cyanobacteria from the environment selectively, without affecting other microorganisms. However, the uncontrolled release of secondary metabolites, including toxins may occur after such a treatment. Our proposal presented in this paper concerns fast biodegradation of microcystin released after cell ...

Inhibition of Initial Attachment of Injured Salmonella Typhimurium onto Abiotic Surfaces.

Following sanitation interventions in food processing facilities, sublethally injured bacterial cells can remain on food contact surfaces. We investigated whether injured Salmonella Typhimurium cells can attach onto abiotic surfaces, which is the initial stage for further biofilm development. We utilized heat, UV, hydrogen peroxide, and lactic acid treatments, which are widely utilized by the food industry. Our results showed that heat, UV, and hydrogen peroxide did not effectively change populations of att...

Lycii fructus extract ameliorates hydrogen peroxide-induced cytotoxicity through indirect antioxidant action.

Lycii Fructus is the dried ripe fruits of Lycium chinense and L. barbarum, which has long been used as a traditional food material in East Asia. The purpose of this study was to investigate the role of the indirect antioxidative action in the Lycii fructus extract (LFE)-induced cytoprotective effect in vitro. LFE significantly enhanced the expression of the drug-metabolizing enzyme genes and intracellular glutathione level in mouse hepatoma Hepa1c1c7 cells. LFE stimulated the nuclear translocation of aryl h...

Antimicrobial effect of different peroxyacetic acid and hydrogen peroxide formats against spores of Clostridium estertheticum.

"Blown pack" spoilage is primarily caused by Clostridium estertheticum. The primary source of contamination is probably pelts, faeces and soil during opening cuts and de-hiding. Peroxyacetic acid (POAA) based fogs are commonly included in an abattoir's routine cleaning process. Hydrogen peroxide (HO) is a powerful oxidizing agent that penetrates microbe cell walls causing cell death. In this study, we compared the ability of HO and OXYSAN ZS (POAA containing 1-hydroxyethylidine-1,1-diphosphonic acid as a st...

Exogenous Melatonin Confers Cadmium Tolerance by Counterbalancing the Hydrogen Peroxide Homeostasis in Wheat Seedlings.

Melatonin has emerged as a research highlight regarding its important role in regulating plant growth and the adaptation to the environmental stresses. In this study, we investigated how melatonin prevented the cadmium toxicity to wheat seedlings. The results demonstrated that cadmium induced the expression of melatonin biosynthesis-related genes and cause a significant increase of endogenous melatonin level. Melatonin treatment drastically alleviated the cadmium toxicity, resulting in increased plant heigh...

Titanium granules pre-treated with hydrogen peroxide inhibit growth of bacteria associated with post-operative infections in spine surgery.

Post-operative infections are relatively common after posterior spine surgery, and there are several observations reflecting different infection complications related to various metals implanted. Here, we selected an array of different bacterial species that are often found in infections associated with orthopaedic implants and tested for inhibition by hydrogen peroxide-treated titanium (Ti-peroxy).

3D mesoporous CuFeO as a catalyst for photo-Fenton removal of sulfonamide antibiotics at near neutral pH.

Increasing the amount of surface active sites of the material may be a feasible way to improve the efficiency ofthe generation of Fe in the photo-Fenton process. In this work, a simple synthesis method was adopted to synthesize 3D ordered mesoporous CuFeO with large specific surface areaby using ferric nitrate and copper nitrate as the precursor and KIT-6 as the template. The synthesized materials were characterized by nitrogen adsorption-desorption, XRD, TEM, FT-IR and UV-vis DRS. The catalytic properties ...

Flow cytometric HyPer-based assay for hydrogen peroxide.

HyPer is a genetically encoded fluorogenic sensor for hydrogen peroxide which is generally used for the ratiometric imaging of HO fluxes in living cells. Here, we demonstrate the advantages of HyPer-based ratiometric flow cytometry assay for HO, by using K562 and human mesenchymal stem cell lines expressing HyPer. We show that flow cytometry analysis is suitable to detect HyPer response to submicromolar concentrations of extracellularly added HO that is much lower than concentrations addressed previously in...

Hydrogen peroxide production and myo-inositol metabolism as important traits for virulence of Mycoplasma hyopneumoniae.

Mycoplasma hyopneumoniae is the causative agent of enzootic pneumonia. In our previous work, we reconstructed the metabolic models of this species along with two other mycoplasmas from the respiratory tract of swine: Mycoplasma hyorhinis, considered less pathogenic but which nonetheless causes disease and Mycoplasma flocculare, a commensal bacterium. We identified metabolic differences that partially explained their different levels of pathogenicity. One important trait was the production of hydrogen peroxi...

Lowering treatment temperature reduces salmon mortality: a new way to treat with hydrogen peroxide in aquaculture.

Does the Use of a "Walking Bleaching" Technique Increase Bone Resorption Markers?

This randomized clinical trial evaluated the effect of 35% hydrogen peroxide in comparison with 37% carbamide peroxide in a nonvital bleaching technique of "walking bleaching" (four sessions of treatment) on periodontal markers: nuclear factor kappa B-ligand (RANK-L-process of root resorption marker) and interleukin 1β (IL-1β-inflammatory response marker).

Effective Disinfection of a Burn Unit after Two Cases of Sepsis Caused by Multi-Drug-Resistant Acinetobacter baumannii.

The healthcare environment is a potential source of microbial pathogens, which may promote infectious cross-transmission. Terminal automated cleaning methods such as hydrogen peroxide systems have proven to be more successful than manual techniques. The aim of this study was to evaluate the effectiveness of an automated aerosolized hydrogen peroxide/silver cations dry-mist system. The goal was to prevent microbial transmission to patients in a clinical setting after two cases of sepsis caused by multi-drug ...

Medicaments and oral healthcare. Adverse effects of medicines and self care products on the gingiva.

Medications and self care products may have adverse effects on the gingiva. These adverse effects can be divided into inflammation, intrinsic discolouration, irritation, trauma, cytotoxicity, lichenoid reaction, and proliferation. This article deals with the first 6 types of adverse effects mentioned: a subsequent article will deal with the last type mentioned. Since contraceptives were introduced, there have been indications that they cause or promote gingivitis, but with the current contraceptives this ad...

Rose petal and P123 dual-templated macro-mesoporous TiO2 for a hydrogen peroxide biosensor.

In this work, highly ordered macro-mesoporous TiO2 has been successfully synthesized using fresh rose petals and P123 (EO20PO70EO20) as dual templates through a simple soaking and calcining process. Characterization of the as-prepared TiO2 indicated that the mesoporous structure of the TiO2 was highly ordered, with a pore diameter of approximately 3nm. After electrodeposition of Pt nanoparticles onto the TiO2 as an electron transfer enhancer and the immobilization of horseradish peroxidase (HRP) onto the Ti...

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