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https://www.readbyqxmd.com/read/28736956/nitrogen-superdoped-3d-graphene-networks-for-high-performance-supercapacitors
#1
Weili Zhang, Chuan Xu, Chaoqun Ma, Guoxian Li, Yuzuo Wang, Kaiyu Zhang, Feng Li, Chang Liu, Hui-Ming Cheng, Youwei Du, Nujiang Tang, Wencai Ren
An N-superdoped 3D graphene network structure with an N-doping level up to 15.8 at% for high-performance supercapacitor is designed and synthesized, in which the graphene foam with high conductivity acts as skeleton and nested with N-superdoped reduced graphene oxide arogels. This material shows a highly conductive interconnected 3D porous structure (3.33 S cm(-1) ), large surface area (583 m(2) g(-1) ), low internal resistance (0.4 Ω), good wettability, and a great number of active sites. Because of the multiple synergistic effects of these features, the supercapacitors based on this material show a remarkably excellent electrochemical behavior with a high specific capacitance (of up to 380, 332, and 245 F g(-1) in alkaline, acidic, and neutral electrolytes measured in three-electrode configuration, respectively, 297 F g(-1) in alkaline electrolytes measured in two-electrode configuration), good rate capability, excellent cycling stability (93...
July 24, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28722461/-disorders-of-water-and-electrolyte-metabolism-and-changes-in-acid-base-balance-in-patients-with-ascitic-liver-cirrhosis
#2
Halima Gottfriedová, Miroslava Horáčková, Milena Čáslavská, Julius Špičák, Otto Schück
In patients with advanced cirrhosis with ascites disorders of water and electrolyte metabolism are often present and they are associated with changes in acid-base balance. These changes can be very complicated, their diagnosis and treatment difficult. Dilutional hyponatremia is the most common disorder. Hyponatremia in these patients is associated with increased morbidity and mortality before and after liver transplantation. Other common disorders include hyperchloremic acidosis, hypokalemia, metabolic alkalosis, lactic acidosis, respiratory alkalosis...
2017: Casopís Lékar̆ů C̆eských
https://www.readbyqxmd.com/read/28719887/anesthetic-management-of-cytoreductive-surgery-and-hyperthermic-intraperitoneal-chemotherapy-crs-hipec-the-importance-of-hydro-electrolytic-and-acid-basic-control
#3
Fabrício Tavares Mendonça, Marília Moreira Guimarães, Sérgio Honorato de Matos, Rúbia Garcia Dusi
JUSTIFICATION AND OBJECTIVES: Patients affected by gynecological or gastrointestinal tract neoplasms that evolve to peritoneal carcinomatosis experience a significant drop in their quality of life, high morbidity and short survival times with currently available chemotherapeutic schemes. The surgical treatment based on cytoreduction and the employment of hyperthermic intraperitoneal chemotherapy in the intra-operative period is a true challenge to anesthesiologist. CASE REPORT: A 67 years old patient diagnosed with mucinous adenocarcinoma of the Appendix associated with mucinous carcinomatosis, was submitted to cytoreductive surgery (CRS) and hyperthermic intraperitoneal chemotherapy (HIPEC), under general anesthesia and epidural block...
July 10, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28716356/fractionation-of-poly-methacrylic-acid-and-poly-vinyl-pyridine-in-aqueous-and-organic-mobile-phases-by-multidetector-thermal-field-flow-fractionation
#4
Guilaume Greyling, Harald Pasch
Multidetector thermal field-flow fractionation (ThFFF) is shown to be a versatile characterisation platform that can be used to characterise hydrophilic polymers in a variety of organic and aqueous solutions with various ionic strengths. It is demonstrated that ThFFF fractionates isotactic and syndiotactic poly(methacrylic acid) (PMAA) as well as poly(2-vinyl pyridine) (P2VP) and poly(4-vinyl pyridine) (P4VP) according to microstructure in organic solvents and that the ionic strength of the mobile phase has no influence on the retention behaviour of the polymers...
July 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28715170/double-soft-template-synthesis-of-nitrogen-sulfur-codoped-hierarchically-porous-carbon-materials-derived-from-protic-ionic-liquid-for-supercapacitor
#5
Li Sun, Hua Zhou, Li Li, Ying Yao, Haonan Qu, Chengli Zhang, Shanhu Liu, Yanmei Zhou
Heteroatom-doped hierarchical porous carbon materials derived from the potential precursors and prepared by a facile, effective and low-pollution strategy have recently been particularly concerned in different research fields. In this study, the interconnected nitrogen/sulfur-codoped hierarchically porous carbon materials have been successfully obtained via one-step carbonization of the self-assembly of [Phne][HSO4] (a protic ionic liquid originated from dilute sulfuric acid and phenothiazine by a straight-forward acid-base neutralization) and the double soft-template of OP-10 and F-127...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28712552/insights-into-head-column-field-amplified-sample-stacking-part-ii-study-of-the-behavior-of-the-electrophoretic-system-after-electrokinetic-injection-of-cationic-compounds-across-a-short-water-plug
#6
Jozef Šesták, Wolfgang Thormann
Part I on head-column field-amplified sample stacking comprised a detailed study of the electrokinetic injection of a weak base across a short water plug into a phosphate buffer at low pH. The water plug is converted into a low conductive acidic zone and cationic analytes become stacked at the interface between this and a newly formed phosphoric acid zone. The fundamentals of electrokinetic processes occurring thereafter were studied experimentally and with computer simulation and are presented as part II. The configuration analyzed represents a discontinuous buffer system...
June 30, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28711257/seasonal-and-maternal-effects-on-acid-base-l-lactate-electrolyte-and-hematological-status-of-205-dairy-calves-born-to-eutocic-dams
#7
L Kovács, F L Kézér, E Albert, F Ruff, O Szenci
In this study, we used linear mixed models to determine the effects of season, time of sampling relative to birth (factors), duration of the delivery process, duration of maternal grooming, calf body weight (BW) at birth, and time of day (covariates) on values of venous blood gas, acid-base and electrolyte parameters, and l-lactate concentrations in dairy calves born to eutocic dams in summer (SUM, n = 101) and winter (WIN, n = 104). Neonatal vitality was assessed at 0, 1, and 24 h after delivery in a linear scoring system using muscle tone, erection of the head, muscle reflexes, heart rate, and sucking drive as criteria...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28710950/citric-acid-assisted-phytoextraction-of-chromium-by-sunflower-morpho-physiological-and-biochemical-alterations-in-plants
#8
Mujahid Farid, Shafaqat Ali, Muhammad Rizwan, Qasim Ali, Farhat Abbas, Syed Asad Hussain Bukhari, Rashid Saeed, Longhua Wu
Soil and water contamination from heavy metals and metalloids is one of the most discussed and burning global issues due to its potential to cause the scarcity of healthy food and safe water. The scientific community is proposing a range of lab and field based physical, chemical and biological solutions to remedy metals and metalloids contaminated soils and water. The present study finds out a possibility of Chromium (Cr) extraction by sunflower from spiked soil under chelating role of citric acid (CA). The sunflower plants were grown under different concentrations of Cr (0, 5, 10 & 20mgkg(-1)) and CA (0, 2...
July 12, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28710594/addressing-a-common-misconception-ammonium-acetate-as-neutral-ph-buffer-for-native-electrospray-mass-spectrometry
#9
Lars Konermann
Native ESI-MS involves the transfer of intact proteins and biomolecular complexes from solution into the gas phase. One potential pitfall is the occurrence of pH-induced changes that can affect the analyte while it is still surrounded by solvent. Most native ESI-MS studies employ neutral aqueous ammonium acetate solutions. It is a widely perpetuated misconception that ammonium acetate buffers the analyte solution at neutral pH. By definition, a buffer consists of a weak acid and its conjugate weak base. The buffering range covers the weak acid pKa ± 1 pH unit...
July 14, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28709871/protein-rna-complexation-driven-by-the-charge-regulation-mechanism
#10
Fernando Luís Barroso da Silva, Philippe Derreumaux, Samuela Pasquali
Electrostatic interactions play a pivotal role in many (bio)molecular association processes. The molecular organization and function in biological systems are largely determined by these interactions from pure Coulombic contributions to more peculiar mesoscopic forces due to ion-ion correlation and proton fluctuations. The latter is a general electrostatic mechanism that gives attraction particularly at low electrolyte concentrations. This charge regulation mechanism due to titrating amino acid and nucleotides residues is discussed here in a purely electrostatic framework...
July 11, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28697495/electrolyte-and-acid-base-abnormalities-in-infants-with-community-acquired-acute-pyelonephritis-prospective-cross-sectional-study
#11
Gregorio P Milani, Angela Grava, Mario G Bianchetti, Sebastiano A G Lava, Laura Dell'Era, Thomas Teatini, Emilio F Fossali
BACKGROUND: Retrospective case series suggest that abnormalities in fluid, electrolyte, and acid-base homeostasis may occur among infants with a febrile urinary tract infection. Potentially inaccurate laboratory methods of sodium testing have often been used. METHODS: Between January 2009 and June 2016, we managed 80 previously healthy infants (52 males and 28 females) ≥4 weeks to ≤24 months of age with their first episode of acute pyelonephritis. Ionized sodium, ionized potassium and ionized chloride were determined by direct potentiometry, as recommended by the International Federation of Clinical Chemistry...
July 12, 2017: Nephron
https://www.readbyqxmd.com/read/28693594/the-impact-of-phosphate-balanced-crystalloid-infusion-on-acid-base-homeostasis-palance-study-study-protocol-for-a-randomized-controlled-trial
#12
Judith-Irina Pagel, Nikolai Hulde, Tobias Kammerer, Michaela Schwarz, Daniel Chappell, Alexander Burges, Klaus Hofmann-Kiefer, Markus Rehm
BACKGROUND: This study aims to investigate the effects of a modified, balanced crystalloid including phosphate in a perioperative setting in order to maintain a stable electrolyte and acid-base homeostasis in the patient. METHODS/DESIGN: This is a single-centre, open-label, randomized controlled trial involving two parallel groups of female patients comparing a perioperative infusion regime with sodium glycerophosphate and Jonosteril® (treatment group) or Jonosteril® (comparator) alone...
July 10, 2017: Trials
https://www.readbyqxmd.com/read/28683179/capillary-electrophoresis-with-capacitively-coupled-contactless-conductivity-detection-method-development-and-validation-for-the-determination-of-azithromycin-clarithromycin-and-clindamycin
#13
Prasanta Paul, Tom Duchateau, Cari Griend, Erwin Adams, Ann Van Schepdael
A capillary electrophoresis with capacitively coupled contactless conductivity detection based method for the assay of azithromycin, clarithromycin and clindamycin was optimized and validated in this study. A buffer solution of 20 mM 2-(N-morpholino) ethane sulfonic acid, 40 mM l-histidine and 0.6 mM cetyltrimethylammonium bromide (pH 6.39) was used for the electrophoresis. An uncoated, bare-fused silica capillary (total length 60 cm, effective length 32 cm, 75 μm i.d.) was used at 25°C. The sample was injected hydrodynamically at 0...
July 6, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28679017/a-comparison-of-qtc-intervals-in-alcohol-withdrawal-patients-versus-acute-coronary-syndrome-patients
#14
Timothy Chu, Keith Azevedo, Amy A Ernst, Dusadee Sarangarm, Steven J Weiss
OBJECTIVES: Patients with an alcohol use disorder experiencing acute intoxication or withdrawal may be at risk for electrocardiograph (ECG) abnormalities, including prolongation of repolarization (long QTc [corrected QT]) that may contribute to arrhythmias and may be associated with a threefold increase in the likelihood of sudden cardiac events. Patients with acute coronary syndrome may have prolonged QTc as well. To our knowledge, no previous studies have compared the QTc of ACS with acute ethanol (EtOH) withdrawal syndromes in the emergency department (ED)...
July 2017: Southern Medical Journal
https://www.readbyqxmd.com/read/28676867/membraneless-electrolyzers-for-the-simultaneous-production-of-acid-and-base
#15
Oyinkansola O Talabi, Anna E Dorfi, Glen D O'Neil, Daniel V Esposito
This study investigates the use of membraneless electrolyzers based on angled mesh flow-through electrodes for the simultaneous production of acid and base (lye) from aqueous brine solutions. These electrolyte-agnostic flow cells are capable of producing a wide variety of acids and bases with precisely controlled pH using a simple cell design.
July 5, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28672949/long-term-adefovir-therapy-may-induce-fanconi-syndrome-a-report-of-four-cases
#16
Fan Pan, Yingchao Wang, Xin Zhang, Qingfeng Lin, Xiaolong Liu, Yi Jiang, Chen Pan
Fanconi syndrome is a rare disease characterized by dysfunction of the proximal renal tubules as a result of various pathogenic events. Drug-induced Fanconi syndrome may be neglected or misdiagnosed, which increases the level of suffering. The aim of the present study was to conduct an investigation into the effects of adefovir (ADV)-induced Fanconi syndrome. Four typical cases of Fanconi syndrome caused by long-term ADV therapy (2-9 years) were diagnosed at our hospital. A complete medical and therapy history was collected from all four patients prior to a physical examination...
July 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28622725/self-supported-biocarbon-fiber-electrode-decorated-with-molybdenum-carbide-nanoparticles-for-highly-active-hydrogen-evolution-reaction
#17
Jian Xiao, Yan Zhang, Zheye Zhang, Qiying Lv, Feng Jing, Kai Chi, Shuai Wang
Devising and facilely synthesizing an efficient noble metal-free electrocatalyst for the acceleration of the sluggish kinetics in the hydrogen-evolution reaction (HER) is still a big challenge for electrolytic water splitting. Herein, we present a simple one-step approach for constructing self-supported biocarbon-fiber cloth decorated with molybdenum carbide nanoparticles (BCF/Mo2C) electrodes by a direct annealing treatment of the Mo oxyanions loaded cotton T-shirt. The Mo2C nanoparticles not only serve as the catalytic active sites toward the HER but also enhance the hydrophilicity and conductivity of resultant electrodes...
July 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28622631/equilibria-model-for-ph-variations-and-ion-adsorption-in-capacitive-deionization-electrodes
#18
Ali Hemmatifar, Diego I Oyarzun, James W Palko, Steven A Hawks, Michael Stadermann, Juan G Santiago
Ion adsorption and equilibrium between electrolyte and microstructure of porous electrodes are at the heart of capacitive deionization (CDI) research. Surface functional groups are among the factors which fundamentally affect adsorption characteristics of the material and hence CDI system performance in general. Current CDI-based models for surface charge are mainly based on a fixed (constant) charge density, and do not treat acid-base equilibria of electrode microstructure including so-called micropores. We here expand current models by coupling the modified Donnan (mD) model with weak electrolyte acid-base equilibria theory...
May 20, 2017: Water Research
https://www.readbyqxmd.com/read/28620821/administration-of-exogenous-melatonin-after-the-onset-of-systemic-inflammation-is-hardly-beneficial
#19
Lisa Brencher, Maren Oude Lansink, Katharina Effenberger-Neidnicht
Melatonin improves survival and functional impairment including hemolysis, thrombocytopenia, and hypotension when administered in a prophylactic manner or early after initiation of sepsis or endotoxemia. In the present study, melatonin was given not before first symptoms of systemic inflammation became manifest. Lipopolysaccharide was infused at a rate of 0.5 mg/kg × h to induce systemic inflammation in male Wistar rats. Melatonin (single dose 3 mg/kg × 15 min) was intravenously administered 180 and 270 min after starting of the lipopolysaccharide infusion...
June 15, 2017: Inflammation
https://www.readbyqxmd.com/read/28608260/water-electrolyte-acid-base-and-trace-elements-alterations-in-cirrhotic-patients
#20
REVIEW
Carlos G Musso, Rossina Juarez, Richard J Glassock
Chronic hepatic patients, and particularly those suffering from cirrhosis, are predisposed to different sort of water, electrolyte, acid-base, and trace elements disorders due to their altered liver function, and also to their exposition to infectious, inflammatory, oncologic, and pharmacologic variables whose combination undermines their homeostatic capability. Hyponatremia, hypokalemia, hyperkalemia, hypocalcemia, metabolic acidosis, respiratory, and metabolic alkalosis are the main internal milieu alterations in this group...
June 12, 2017: International Urology and Nephrology
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