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https://www.readbyqxmd.com/read/28723882/altered-carnitine-homeostasis-in-children-with-increased-pulmonary-blood-flow-due-to-ventricular-septal-defects
#1
Stephen M Black, Aida Field-Ridley, Shruti Sharma, Sanjiv Kumar, Roberta L Keller, Rebecca Kameny, Emin Maltepe, Sanjeev A Datar, Jeffrey R Fineman
OBJECTIVES: Congenital heart disease with increased pulmonary blood flow results in progressive pulmonary vascular endothelial dysfunction and associated increased perioperative morbidity. Using our ovine model of congenital heart disease with increased pulmonary blood flow, we have previously demonstrated progressive endothelial dysfunction associated with disruption in carnitine homeostasis, mitochondrial dysfunction, decreased nitric oxide signaling, and enhanced reactive oxygen species generation...
July 18, 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/28723418/beta3-adrenergic-receptor-stimulation-in-human-macrophages-inhibits-nadphoxidase-activity-and-induces-catalase-expresssion-via-ppar%C3%AE-activation
#2
Tarik Hadi, Romain Douhard, Alexandre M M Dias, Maeva Wendremaire, Maria Pezzè, Marc Bardou, Paul Sagot, Carmen Garrido, Frédéric Lirussi
The beta3 adrenergic receptor (β3-AR) stimulation plays a protective role against preterm labor by blocking myometrial contraction, cytokine production, remodeling and apoptosis. We previously demonstrated that macrophage-induced ROS production in the myometrium was a key element leading to the induction of all these labor-associated features. We thus aimed to investigate if the β3-AR could be expressed in human macrophages and could trigger its protective role in the myometrium by directly inhibiting ROS production...
July 16, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28723153/understanding-the-reactivity-of-co3-%C3%A2-and-no2-%C3%A2-radicals-towards-s-containing-and-aromatic-amino-acids
#3
Sharmistha Karmakar, Ayan Datta
The reactivity of CO3-(.) and NO2(.) radicals towards six amino acid side chains namely, cysteine (Cys), methionine (Met), phenylalanine (Phe), tyrosine (Tyr), histidine (His) and tryptophan (Trp), has been explored using state-of-art density functional theory (DFT) and transition state theory (TST). Three reaction mechanisms, namely hydrogen atom abstraction (HAT), radical adduct formation (RAF) and single electron transfer (SET) have been considered for detailed study. While CO3-(.) radical is highly reactive towards majority of amino acids, the reactivity of NO2(...
July 19, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28720970/effect-of-rice-bran-oil-spread-on-the-physical-sensory-and-fatty-acid-profile-of-cake
#4
Rizwana Shaik, Aparna Kuna, Mohibbe Azam, Ram Tilathoo, Manorama Kanuri, Geetha Samala
Studies were carried out to replace hydrogenated fat (HF) with rice bran oil (RBO) and two varieties of rice bran oil spread RBOS1 and RBOS2 in the preparation of cake. Physico-chemical properties, sensory properties, scanning electronic microscopic (SEM) study and fatty acid estimation with reference to trans fatty acids of cake made with control and experimental samples were studied. The best acceptable cake among the four i.e., RBOS2 cake was selected for consumer evaluation along with control (HF) cake...
June 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28720320/hydrogen-sulfide-improves-diabetic-wound-healing-in-ob-ob-mice-via-attenuating-inflammation
#5
Huichen Zhao, Shengxia Lu, Jiachao Chai, Yuchao Zhang, Xiaoli Ma, Jicui Chen, Qingbo Guan, Meiyan Wan, Yuantao Liu
BACKGROUND: The proposed mechanisms of impaired wound healing in diabetes involve sustained inflammation, excess oxidative stress and compromised agiogenesis. Hydrogen sulfide (H2S) has been reported to have multiple biological activities. We aim to investigate the role of H2S in impaired wound healing in ob/ob mice and explore the possible mechanisms involved. PROCEDURES: Full-thickness skin dorsal wounds were created on ob/ob mice and C57BL/6 mice. Cystathionine-γ-lyase (CSE) expression and H2S production were determined in granulation tissues of the wounds...
June 30, 2017: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/28718966/dft-studies-on-the-mechanism-of-ag2-co3-catalyzed-hydroazidation-of-unactivated-terminal-alkynes-with-tms-n3-an-insight-into-the-silver-i-activation-mode
#6
Haiyan Yuan, Pin Xiao, Yiying Zheng, Jingping Zhang
Silver-mediated hydroazidation of unactivated alkynes has been developed as a new method for the synthesis of vinyl azides. Density functional theory calculations toward this reaction reveal that terminal alkynes with TMS-N3 participated hydroazidation proceed through HN3 formation, deprotonation and silver acetylides formation, nucleophilic addition, and protonation of terminal carbon by AgHCO3 . It is also found that water molecules and activation modes of Ag (I) have a significant influence on the title reaction mechanism...
July 18, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28717204/a-drug-carrier-for-sustained-zero-order-release-of-peptide-therapeutics
#7
Ya-Nan Zhao, Xiaoyu Xu, Na Wen, Rui Song, Qingbin Meng, Ying Guan, Siqi Cheng, Danni Cao, Yansheng Dong, Jiankun Qie, Keliang Liu, Yongjun Zhang
Peptides have great potential as therapeutic agents, however, their clinic applications are severely hampered by their instability and short circulation half-life. Zero-order release carriers could not only extend the circulation lifetime of peptides, but also maintain the plasma drug level constant, and thus maximize their therapeutic efficacy and minimize their toxic effect. Here using PEGylated salmon calcitonin (PEG-sCT)/tannic acid (TA) film as an example, we demonstrated that hydrogen-bonded layer-by-layer films of a PEGylated peptide and a polyphenol could be a platform for zero-order peptide release...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28716416/role-and-interrelationship-of-mek1-mpk6-cascade-hydrogen-peroxide-and-nitric-oxide-in-darkness-induced-stomatal-closure
#8
Teng-Yue Zhang, Feng-Chen Li, Cai-Ming Fan, Xuan Li, Fang-Fang Zhang, Jun-Min He
Pharmacological data have suggested the involvement of mitogen-activated protein kinase (MPK) cascades in dark-induced stomatal closure, but which specific MPK cascade participates in the darkness guard cell signaling and its relationship with hydrogen peroxide (H2O2) and nitric oxide (NO) remain unclear. In this paper, we observed that darkness induced activation of MPK6 in leaves of wild-type Arabidopsis (Arabidopsis thaliana) and mutants for nitrate reductase 1 (NIA1), but this effect was inhibited in mutants for MPK Kinase 1 (MEK1) and ATRBOHD/F...
September 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28715870/neuroprotective-effect-of-trans-n-caffeoyltyramine-from-lycium-chinense-against-h2o2-induced-cytotoxicity-in-pc12-cells-by-attenuating-oxidative-stress
#9
Opeyemi J Olatunji, Hongxia Chen, Yifeng Zhou
Natural products play a critical role in the promotion of good health as regards the prevention and management of oxidative stress related and neurodegenerative disorders. Oxidative stress has been implicated in several apoptotic pathways associated with cell damages in neuronal disorders. The aim of this study was to investigate the antioxidant effect of trans-N-caffeoyltyramine (TNC) isolated from Cortex lycii against hydrogen peroxide (H2O2) induced cell damages in PC12 cells as well as its mechanism of action...
July 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28715858/biomimetic-nitrogen-doped-titania-nanoparticles-as-a-colorimetric-platform-for-hydrogen-peroxide-detection
#10
Muhammad Nasir, Sajid Rauf, Nawshad Muhammad, Mian Hasnain Nawaz, Aqif Anwar Chaudhry, Muhammad Hamza Malik, Shakir Ahmad Shahid, Akhtar Hayat
Nanoparticles proved a viable alternative to the already used sensing and diagnostics methods due to their low cost, good stability, easy availability and easy synthesis. In the present approach, nitrogen doped titania nanoparticles are prepared through freeze drying method, and subsequently stabilized through ionic liquid. These nanoparticles were characterized through various techniques such as X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), BET pore size and surface area analyzer, X-ray photoelectron spectroscopy (XPS) and UV-Visible diffuse reflectance spectroscopy (UV-Vis...
July 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28715745/a-practical-protocol-for-comprehensive-evaluation-of-sulfur-fumigation-of-gastrodia-rhizoma-using-metabolome-and-health-risk-assessment-analysis
#11
Chuanzhi Kang, Chang-Jiang-Sheng Lai, Dan Zhao, Tao Zhou, Da-Hui Liu, Chaogeng Lv, Sheng Wang, Liping Kang, Jian Yang, Zhi-Lai Zhan, Lu-Qi Huang, Lanping Guo
Gastrodia Rhizoma is one of the most heavily sulfur-fumigated edible and medical herbs in the marketplace. We developed a practical protocol using an ultra-performance liquid chromatography coupled with quadrupole time-of-flight-MS(E) (UPLC/QTOF-MS(E))-based metabolome and health risk assessment model to identify characteristic sulfur-fumigated markers, dissect chemical transformation mechanisms, and control the quality of sulfur-fumigated Gastrodia Rhizoma. Two sulfur-containing p-hydroxybenzyl products, one sulfur-containing disaccharide, one glycolipid, and two phospholipids were selected and identified as markers based on multivariate statistical analysis...
July 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28715183/dimethyl-sulfoxide-complexes-detected-at-ambient-conditions
#12
Anne Schou Hansen, Henrik Grum Kjaergaard
Dimethyl sulfoxide (DMSO) is an important intermediate in the atmospheric oxi- dation of dimethyl sulfide (DMS). DMS, emitted from the ocean, is the main natural sulfur source and its oxidation products are essential in the formation of sulfate aerosols. The high atmospheric concentration of water makes hydrogen bonding with DMS and its oxidation products likely. Through hydrogen bonding, water can potentially cat- alyze and affect the steps of the oxidation. We investigate binary hydrogen bound complexes involving DMSO...
July 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28714671/a-facile-method-for-the-preparation-of-covalent-triazine-framework-coated-monoliths-as-catalyst-support-applications-in-c1-catalysis
#13
Anastasiya V Bavykina, Alma Itzel Olivos Suarez, Dmitrii Osadchii, Rahul Valecha, Robert Franz, Michiel Makkee, Freek Kapteijn, Jorge Gascon
A quasi Chemical Vapour Deposition method for the manufacturing of well-defined Covalent Triazine Framework (CTF) coatings on cordierite monoliths is reported. The resulting supported porous organic polymer is an excellent support for the immobilisation of two different homogeneous catalysts: 1) an IrIIICp*-based catalyst for the hydrogen production from formic acid, and 2) a PtII-based for the direct activation of methane via Periana chemistry. The immobilised catalysts display a much higher activity in comparison with the unsupported CTF operated in slurry because of improved mass transport...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28714663/harnessing-hot-electrons-from-near-ir-light-for-hydrogen-production-using-pt-end-capped-aunrs
#14
Nathalia Ortiz, Brandon Zoellner, Soung Joung Hong, Yue Ji, Tao Wang, Yang Liu, Paul A Maggard, Gufeng Wang
Gold nanorods show great potential in harvesting natural sun light and generating hot charge carriers that can be employed to produce electrical or chemical energies. We show that photochemical reduction of Pt(IV) to Pt metal mainly takes place at the ends of gold nanorods (AuNRs), suggesting photon-induced hot electrons are localized in a time-averaged manner at AuNR ends. To use these hot electrons efficiently, a novel synthetic method to selectively overgrow Pt at the ends of AuNRs has been developed. These Pt-end-capped AuNRs show relatively high activity for the production of hydrogen gas using artificial white light, natural sun light, and more importantly, near IR light at 976 nm...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28714078/ternary-porous-cobalt-phosphoselenide-nanosheets-an-efficient-electrocatalyst-for-electrocatalytic-and-photoelectrochemical-water-splitting
#15
Yang Hou, Ming Qiu, Tao Zhang, Xiaodong Zhuang, Chang-Soo Kim, Chris Yuan, Xinliang Feng
Exploring efficient and earth-abundant electrocatalysts is of great importance for electrocatalytic and photoelectrochemical hydrogen production. This study demonstrates a novel ternary electrocatalyst of porous cobalt phosphoselenide nanosheets prepared by a combined hydrogenation and phosphation strategy. Benefiting from the enhanced electric conductivity and large surface area, the ternary nanosheets supported on electrochemically exfoliated graphene electrodes exhibit excellent catalytic activity and durability toward hydrogen evolution in alkali, achieving current densities of 10 and 20 mA cm(-2) at overpotentials of 150 and 180 mV, respectively, outperforming those reported for transition metal dichalcogenides and first-row transition metal pyrites catalysts...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28713283/excitatory-modulation-of-the-preb%C3%A3-tzinger-complex-inspiratory-rhythm-generating-network-by-endogenous-hydrogen-sulfide
#16
Glauber S F da Silva, João P J Sabino, Vishaal Rajani, Tucaauê S Alvares, Silvia Pagliardini, Luiz G S Branco, Gregory D Funk
Hydrogen Sulfide (H2S) is one of three gasotransmitters that modulate excitability in the CNS. Global application of H2S donors or inhibitors of H2S synthesis to the respiratory network has suggested that inspiratory rhythm is modulated by exogenous and endogenous H2S. However, effects have been variable, which may reflect that the RTN/pFRG (retrotrapezoid nucleus, parafacial respiratory group) and the preBötzinger Complex (preBötC, critical for inspiratory rhythm generation) are differentially modulated by exogenous H2S...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28713194/drought-priming-improves-subsequent-more-severe-drought-in-a-drought-sensitive-cultivar-of-olive-cv-ch%C3%A3-toui
#17
Mariem Ben Abdallah, Kawther Methenni, Issam Nouairi, Mokhtar Zarrouk, Nabil Ben Youssef
Drought is a major factor limiting crop production worldwide. The objective of this study was to test whether pre-exposure to drought can enhance the subsequent drought response of a drought-sensitive variety of olive cv. Chétoui. Seven-months old olive plants were grown in a controlled conditions and divided into control plants (irrigated daily), primed plants (PP, primed by exposure to drought for 21 days, re-watered for 60 days and then exposed to water depletion for 30 days) and non-primed plants (NPP, well watered for 81 days and immediately followed by intermediate drought as PP)...
July 14, 2017: Scientia Horticulturae
https://www.readbyqxmd.com/read/28712812/peroxynitrite-footprint-in-circulating-neutrophils-of-abdominal-aortic-aneurysm-patients-is-lower-in-statin-than-in-non-statin-users
#18
M E Groeneveld, J J van der Reijden, G J Tangelder, L C Westin, L Renwarin, R J P Musters, W Wisselink, K K Yeung
OBJECTIVES: Extensive reactive oxygen and nitrogen species (also reactive species) production is a mechanism involved in abdominal aortic aneurysm (AAA) development. White blood cells (WBCs) are a known source of reactive species. Their production may be decreased by statins, thereby reducing the AAA growth rate. Reactive species production in circulating WBCs of AAA patients and the effect of statins on their production was investigated. METHODS: This observational study investigated reactive species production in vivo and ex vivo in circulating WBCs of AAA patients, using venous blood from patients prior to elective AAA repair (n = 34; 18 statin users) and from healthy volunteers (n = 10)...
July 14, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28712076/nickel-stressed-responses-of-rice-in-ni-subcellular-distribution-antioxidant-production-and-osmolyte-accumulation
#19
Muhammad Rizwan, Muhammad Imtiaz, Zhihua Dai, Sajid Mehmood, Muhammad Adeel, Jinchang Liu, Shuxin Tu
Nickel has been found a key pollutant in farmlands of central and south China, and understanding of Ni toxicity in rice is of great significance in safety production of rice and remediation of Ni polluted paddy soils. The present study aimed to investigate the uptake and subcellular distribution of Ni, antioxidant production, and osmolyte accumulation of rice (Oryza sativa L., cv. yangliangyou 6) plants exposed to excessive Ni concentrations to gain an insight into Ni-induced phytotoxicity. Results revealed that exposure of rice seedlings to high Ni concentrations resulted a decline in root and shoot lengths and fresh weight (FW) and dry weight (DW) of rice plants, which are in connection with the depletion of the contents of photosynthetic pigments...
July 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28711827/efficient-photocatalytic-degradation-of-tetrabromodiphenyl-ethers-and-simultaneous-hydrogen-production-by-tio2-cu2o-composite-films-in-n2-atmosphere-influencing-factors-kinetics-and-mechanism
#20
Zhe Hu, Xi Wang, Haitai Dong, Shangyi Li, Xukai Li, Laisheng Li
TiO2-Cu2O photocatalyst composite film with a heterostructure was synthesized on a copper substrate for 2,2',4,4'-tetrabromodiphenyl ether (BDE47) reduction. First, Cu2O film was synthesized by the electrochemical deposition method, and then TiO2 was coated on the surface of the Cu2O film. The morphology, surface chemical composition and optical characteristics of TiO2-Cu2O film were characterized. The degradation efficiency of BDE47 and hydrogen production by TiO2-Cu2O films was higher than those by pure TiO2 or Cu2O films...
July 5, 2017: Journal of Hazardous Materials
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