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https://www.readbyqxmd.com/read/29148925/degradation-of-chlordecone-and-beta-hexachlorocyclohexane-by-photolysis-photo-fenton-oxidation-and-ozonation
#1
Germán Cruz-González, Carine Julcour, Hélène Chaumat, Valérie Bourdon, Felipe Ramon-Portugal, Sarra Gaspard, Ulises J Jáuregui-Haza, Henri Delmas
Intensive use of chlorinated pesticides from the 1960s to the 1990s has resulted in a diffuse contamination of soils and surface waters in the banana-producing areas of the French West Indies. The purpose of this research was, for the first time, to examine the degradation of two of these persistent pollutants - chlordecone (CLD) and beta-hexachlorocyclohexane (β-HCH) in 1 mg L(-1) synthetic aqueous solutions by means of photolysis, (photo-) Fenton oxidation and ozonation processes. Fenton oxidation is not efficient for CLD and yields less than 15% reduction of β-HCH concentration in 5 h...
November 17, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/29148747/investigation-of-the-iron-peroxo-complex-in-the-fenton-reaction-kinetic-indication-decay-kinetics-and-hydroxyl-radical-yields
#2
Hanna Laura Wiegand, Christian Timon Orths, Klaus Kerpen, Holger Volker Lutze, Torsten Claus Schmidt
The Fenton reaction describes the reaction of Fe(II) with hydrogen peroxide. Several researchers proposed the formation of an intermediate iron-peroxo-complex but experimental evidence for its existence is still missing. The present study investigates formation and life time of this intermediate at various conditions such as different Fe(II)-concentrations, absence vs. presence of a hydroxyl radical scavenger (dimethylsulfoxide, DMSO), and different pH values. Obtained results indicate that the iron-peroxo-complex is formed under all experimental conditions...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29148746/keto-enol-tautomerization-triggers-an-electrophilic-aldehyde-deformylation-reaction-by-a-nonheme-manganese-iii-peroxo-complex
#3
Fabián G Cantú Reinhard, Prasenjit Barman, Gourab Mukherjee, Jitendra Kumar, Deep Kumar, Devesh Kumar, Chivukula V Sastri, Sam P de Visser
Oxygen atom transfer by high-valent enzymatic intermediates remains an enigma in chemical catalysis. In particular, manganese is an important first-row metal involved in key biochemical processes including the biosynthesis of mo-lecular oxygen (through the photosystem II complex) and biodegradation of toxic superoxide to hydrogen peroxide by superoxide dismutase. Biomimetic models of these biological systems have been developed to gain understanding on the structure and properties of short-lived intermediates but also with the aim to create environmentally benign oxidants...
November 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29148724/photooxidation-of-aniline-derivatives-can-be-activated-by-freezing-their-aqueous-solutions
#4
Pablo Corrochano, Dana Nachtigallová, Petr Klán
A combined experimental and computational approach was used to investigate the spectroscopic properties of three different aniline derivatives (aniline, N,N-dimethylaniline, and N,N-diethylaniline) in aqueous solutions and at the air-ice interface in the temperature range of 243-298 K. The absorption and diffuse reflectance spectra of ice samples prepared by different techniques, such as slow or shock freezing of the aqueous solutions or vapor deposition on ice grains, exhibited unequivocal bathochromic shifts of 10-15 nm of the absorption maxima of anilines in frozen samples compared to those in liquid aqueous solutions...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29147868/hydrogen-peroxide-h2o2-a%C3%A2-review-of-its-use-in-surgery
#5
REVIEW
Michael Vincent Urban, Thomas Rath, Christine Radtke
Hydrogen peroxide has been used in medicine for more than 100 years. It is known in surgery as a highly useful irrigation solution by virtue of both its hemostatic and its antimicrobial effects. Due to its possible negative effect on wound healing and its cytotoxic effect in higher concentrations, there are concerns about the safety of its use. The objective of this paper is to review the safety and beneficial effects of hydrogen peroxide.
November 16, 2017: Wiener Medizinische Wochenschrift
https://www.readbyqxmd.com/read/29147457/oxidative-stress-delays-prometaphase-metaphase-of-the-first-cleavage-in-mouse-zygotes-via-the-mad2l1-mediated-spindle-assembly-checkpoint
#6
Que Wu, Zhiling Li, Yue Huang, Diting Qian, Man Chen, Wanfen Xiao, Bin Wang
In zygotes, DNA damage delays the first cleavage to enable repair. Our previous study found that 0.03 mM hydrogen peroxide (H2O2) was the minimum concentration required for induction of oxidative DNA damage in mouse zygotes and that this represented the most similar situation to the clinical phenomenon. In this study, we quantified the cleavage rates of cells in blastocysts at different developmental stages, followed by immunofluorescence to detect activation of γ-H2A histone family member X (a marker of DNA damage) in zygotes to confirm that oxidative DNA damage was induced in H2O2-treated zygotes...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29145191/antioxidants-maintain-cellular-redox-homeostasis-by-elimination-of-reactive-oxygen-species
#7
Long He, Ting He, Shabnam Farrar, Linbao Ji, Tianyi Liu, Xi Ma
Reactive oxygen species (ROS) are produced by living cells as normal cellular metabolic byproduct. Under excessive stress conditions, cells will produce numerous ROS, and the living organisms eventually evolve series of response mechanisms to adapt to the ROS exposure as well as utilize it as the signaling molecules. ROS molecules would trigger oxidative stress in a feedback mechanism involving many biological processes, such as apoptosis, necrosis and autophagy. Growing evidences have suggested that ROS play a critical role as the signaling molecules throughout the entire cell death pathway...
November 17, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29145090/comparative-study-of-dissolved-organic-matter-generated-from-activated-sludge-during-exposure-to-hypochlorite-hydrogen-peroxide-acid-and-alkaline-implications-for-on-line-chemical-cleaning-of-mbr
#8
Weiwei Cai, Yu Liu
Although on-line chemical cleaning has been extensively employed for maintaining the MBR permeability, little attention has been given to the negative impacts of such prevalent membrane cleaning practice. This study thus comparatively investigated the potential release of dissolved organic matter (DOM) from activated sludge upon the exposure to different kinds of frequently-used cleaning reagents, i.e. NaClO, H2O2, HCl and NaOH. It was found that NaClO at 50 and 80 mg L(-1) triggered significant release of DOM, while NaOH strongly promoted soluble nitrogen release...
November 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/29144879/effectiveness-and-impact-of-the-walking-bleach-technique-on-esthetic-self-perception-and-psychosocial-factors-a-randomized-double-blind-clinical-trial
#9
C Bersezio, J Martin, F Peña, M Rubio, J Estay, R Vernal, Ob Oliveira Junior, E Fernández
OBJECTIVE: This trial evaluates the impact of psychosocial and esthetic self-perceptions of patients undergoing nonvital tooth bleaching using the walking bleach technique. We also assessed the clinical effectiveness of bleaching tooth discoloration. METHODS: Fifty volunteers with nonvital tooth discoloration were enrolled. Teeth were randomized into two groups: 35% hydrogen peroxide (n=25) and 37% carbamide peroxide (n=25). Intracoronal bleaching was performed over four sessions using the walking bleach technique...
November 2017: Operative Dentistry
https://www.readbyqxmd.com/read/29144303/zero-valent-aluminum-mediated-degradation-of-bisphenol-a-in-the-presence-of-common-oxidants
#10
I Arslan-Alaton, T Olmez-Hanci, M Dogan, T Ozturk
The use of a commercial, nano-scale zero-valent aluminum (ZVA) powder was explored for the treatment of aqueous Bisphenol A (BPA). The study focused on the (i) activation of hydrogen peroxide (HP) and persulfate (PS) oxidants with ZVA to accelerate BPA degradation, (ii) comparison of the treatment performance in pure and real surface water (SW) samples, (iii) effects on toxicity and (iv) reuse potential of ZVA nanoparticles after ZVA/HP and ZVA/PS treatments. In pure water, ZVA coupled with HP or PS provided an effective means of BPA treatment particularly when PS was employed as the oxidant...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144223/no-touch-disinfection-methods-to-decrease-multidrug-resistant-organism-infections-a-systematic-review-and-meta-analysis
#11
Alexandre R Marra, Marin L Schweizer, Michael B Edmond
BACKGROUND Recent studies have shown that using no-touch disinfection technologies (ie, ultraviolet light [UVL] or hydrogen peroxide vapor [HPV] systems) can limit the transmission of nosocomial pathogens and prevent healthcare-associated infections (HAIs). To investigate these findings further, we performed a systematic literature review and meta-analysis on the impact of no-touch disinfection methods to decrease HAIs. METHODS We searched PubMed, CINAHL, CDSR, DARE and EMBASE through April 2017 for studies evaluating no-touch disinfection technology and the nosocomial infection rates for Clostridium difficile, methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant enterococci (VRE), and other multidrug-resistant organisms (MDROs)...
November 16, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/29143704/identification-of-clostridium-difficile-reservoirs-in-the-patient-environment-and-efficacy-of-aerial-hydrogen-peroxide-decontamination
#12
Samuel Yui, Shanom Ali, Monika Muzslay, Annette Jeanes, A Peter R Wilson
OBJECTIVE To identify, using a novel enhanced method of recovery, environmental sites where spores of Clostridium difficile persist despite cleaning and hydrogen peroxide aerial decontamination. DESIGN Cohort study. SETTING Tertiary referral center teaching hospital. METHODS In total, 16 sites representing high-frequency contact or difficult-to-clean surfaces in a single-isolation room or bed area in patient bed bays were sampled before and after terminal or hydrogen peroxide disinfection using a sponge swab...
November 16, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/29143382/the-effect-of-resveratrol-on-the-developmental-competence-of-porcine-oocytes-vitrified-at-germinal-vesicle-stage
#13
Ecs Santos, R Appeltant, T Q Dang-Nguyen, J Noguchi, H Kaneko, K Kikuchi, T Somfai
We tested the effects of resveratrol both as a pre-treatment and as a recovery treatment after warming during in vitro maturation (IVM) on the viability and developmental competence of porcine oocytes vitrified at the germinal vesicle stage. Pre-treatment before vitrification of oocytes for 3 hr with 2 μM resveratrol did not affect survival, oocyte maturation and embryo developmental competence to the blastocyst stage after parthenogenetic activation. However, supplementation of the medium with resveratrol during subsequent IVM after vitrification and warming significantly improved the ability of surviving oocytes to develop to the blastocyst stage, and this effect was observed only on vitrified, but not on non-vitrified oocytes...
November 16, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/29143242/comparing-reactive-oxygen-species-and-dna-fragmentation-in-semen-samples-of-unexplained-infertile-and-healthy-fertile-men
#14
Zahra Zandieh, Akram Vatannejad, Mahmood Doosti, Sara Zabihzadeh, Mahnaz Haddadi, Leila Bajelan, Batool Rashidi, Saeid Amanpour
BACKGROUND: Male factor infertility has increased to more than 40% during the last decade. About 30% of these couples are diagnosed with unexplained infertility. In fact, reactive oxygen species (ROS), especially superoxide anion (O2(-)·) and hydrogen peroxide (H2O2), play a crucial role in regulation of physiological and pathological processes in spermatozoa. Moreover, since the diagnosis of unexplained infertility just through semen analysis is a matter of much controversy; we aimed to evaluate the levels of ROS and sperm DNA fragmentation in the semen samples of unexplained infertile and fertile control couples...
November 15, 2017: Irish Journal of Medical Science
https://www.readbyqxmd.com/read/29142438/molecular-simulation-based-combinatorial-modeling-and-antioxidant-activities-of-zingiberaceae-family-rhizomes
#15
Talambedu Usha, Sushen Pradhan, Arvind Kumar Goyal, Shanmugarajan Dhivya, H P Prashanth Kumar, Manoj Kumar Singh, Neelu Joshi, Bharat Chandra Basistha, K R Siddalinga Murthy, Saravanakumar Selvaraj, Sushil Kumar Middha
Objective: The main aim of this scientific report was to investigate a series of phytochemicals in silico and the pharmacology of four plants found at higher altitude in the ginger family, Zingiberaceae (incl. Costaceae) from North-East India, particularly Sikkim. First, the goal was to determine the biological activities of the four herbs (used under Zingiberaceae family) using antioxidant assays to identify the best species. Second, previously reported compounds in litero were subsequently screened for their anticancerous activities using in silico methods...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142416/protective-effect-of-pluchea-lanceolata-against-aluminum-chloride-induced-neurotoxicity-in-swiss-albino-mice
#16
Ravi Mundugaru, Senthilkumar Sivanesan, Padmaja Udaykumar, Niranjan Rao, Naveen Chandra
Background: Aluminum chloride (AlCl3) is a known potent environmental neurotoxin causing progressive neurodegenerative changes in the brain. The herb Pluchea lanceolata is commonly known as "Rasana" and used as a nerve tonic in neuroinflammatory conditions in Indian system of medicine. Objective: To evaluate the neuroprotective activity of hydroalcoholic extract of P. lanceolata in chronic AlCl3-induced neurotoxicity in Swiss albino mice. Materials and Methods: Albino mice were categorized into four different groups; Group 1served as vehicle control, Group 2 mice were administered with AlCl3, 40 mg/kg body weight by intraperitoneal route for 45 consecutive days...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142400/chemical-composition-of-moringa-oleifera-ethyl-acetate-fraction-and-its-biological-activity-in-diabetic-human-dermal-fibroblasts
#17
Sivapragasam Gothai, Katyakyini Muniandy, Mazni Abu Zarin, Tan Woan Sean, S Suresh Kumar, Murugan A Munusamy, Sharida Fakurazi, Palanisamy Arulselvan
Background: Moringa oleifera (MO), commonly known as the drumstick tree, is used in folklore medicine for the treatment of skin disease. Objective: The objective of this study is to evaluate the ethyl acetate (EtOAc) fraction of MO leaves for in vitro antibacterial, antioxidant, and wound healing activities and conduct gas chromatography-mass spectrometry (GC-MS) analysis. Materials and Methods: Antibacterial activity was evaluated against six Gram-positive bacteria and 10 Gram-negative bacteria by disc diffusion method...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29141467/oxidative-stress-biomarkers-in-amniotic-fluid-of-pregnant-women-with-hypothyroidism
#18
Tanja R Novakovic, Zana C Dolicanin, Natasa Z Djordjevic
PURPOSE: Hypothyroidism in pregnancy is the serious state that may lead to fetal morbidity and mortality. Oxidative stress biomarkers in the amniotic fluid can provide important information on the health, development and maturation of the fetus during pregnancy. In this study, we examined whether maternal hypothyroidism contributes to increased oxidative stress biomarkers in the amniotic fluid during the first trimester of pregnancy. MATERIALS AND METHODS: The study was conducted on healthy pregnant women and pregnant women with hypothyroidism (gestational age: 16-18 weeks)...
November 15, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29140592/a-versatile-strategy-to-main-chain-sulfur-selenium-functionalized-polycarbonates-via-macro-ring-closure-of-diols-and-subsequent-ring-opening-polymerization
#19
Chao Wei, Yan Zhang, Bingkun Yan, Yue Xu, Zhengzhen Du, Meidong Lang
Sulfur/selenium containing cyclic carbonate monomers (MR) are designed and synthesized by enzyme catalyzed intermolecular macro-ring closure of related diols. The proposed synthetic strategy is tolerant of other functionalities such as N-substituted groups. The ring opening polymerization (ROP) of MR occurs readily as a versatile route to generate a new family of main chain sulfur/selenium substituted aliphatic polycarbonates (PR) with predictable molecular weights (MW), narrow molecular-weight distribution and controlled copolymer composition...
November 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29140431/microvascular-adaptations-to-exercise-protective-effect-of-pgc-1-alpha
#20
Andrew O Kadlec, Chad Barnes, Matthew J Durand, David D Gutterman
BACKGROUND: Sedentary behavior and obesity are major risk factors for cardiovascular disease. Regular physical activity has independent protective effects on the cardiovascular system, but the mechanisms responsible remain elusive. Recent studies suggest that the protein peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α) participates in the response to exercise training. We hypothesized that the arterioles of athletes maintain dilation to flow despite combined inhibition of multiple vasodilators, but loss of PGC-1α renders these vessels susceptible to inhibition of a single vasodilator pathway...
November 11, 2017: American Journal of Hypertension
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