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https://www.readbyqxmd.com/read/28330109/biomass-production-and-identification-of-suitable-harvesting-technique-for-chlorella-sp-mj-11-11-and-synechocystis-pcc-6803
#1
Amrit Lal, Debabrata Das
Microalgae that can grow fast and convert solar energy into chemical energy efficiently are being considered as a promising feedstock of renewable biofuel. Mass production of microalgal oil faces a number of technical barriers that make the current production of biodiesel economically unfeasible. Small size (≈1-20 μm) and negatively charged surface of the microalgal cells pose difficulties in the process of harvesting. This leads to significant increase in the overall cost of biomass production. The present study explored different methods and conditions for harvesting of Chlorella sp...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28329760/low-temperature-hydrogen-production-from-water-and-methanol-using-pt-%C3%AE-moc-catalysts
#2
Lili Lin, Wu Zhou, Rui Gao, Siyu Yao, Xiao Zhang, Wenqian Xu, Shijian Zheng, Zheng Jiang, Qiaolin Yu, Yong-Wang Li, Chuan Shi, Xiao-Dong Wen, Ding Ma
Polymer electrolyte membrane fuel cells (PEMFCs) running on hydrogen are attractive alternative power supplies for a range of applications, with in situ release of the required hydrogen from a stable liquid offering one way of ensuring its safe storage and transportation before use. The use of methanol is particularly interesting in this regard, because it is inexpensive and can reform itself with water to release hydrogen with a high gravimetric density of 18.8 per cent by weight. But traditional reforming of methanol steam operates at relatively high temperatures (200-350 degrees Celsius), so the focus for vehicle and portable PEMFC applications has been on aqueous-phase reforming of methanol (APRM)...
March 22, 2017: Nature
https://www.readbyqxmd.com/read/28328209/multidk-a-multiple-descriptor-multiple-kernel-approach-for-molecular-discovery-and-its-application-to-the-discovery-of-organic-flow-battery-electrolytes
#3
Sung-Jin Kim, Adrián Jinich, Alán Aspuru-Guzik
We propose a multiple descriptor multiple kernel (MultiDK) method for efficient molecular discovery using machine learning. We show that the MultiDK method improves both the speed and accuracy of molecular property prediction. We apply the method to the discovery of electrolyte molecules for aqueous redox flow batteries. Using \emph{multiple-type - as opposed to single-type - descriptors}, we obtain more relevant features for machine learning. Following the principle of 'wisdom of the crowds', the combination of multiple-type descriptors significantly boosts prediction performance...
March 22, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28328195/degradation-dynamics-for-electrochromic-wo3-films-under-extended-charge-insertion-extraction-unveiling-physicochemical-mechanisms
#4
Rui-Tao Wen, Sara Malmgren, Claes G Granqvist, Gunnar A Niklasson
Degradation of electrochromic thin films under extended charge insertion/extraction is a technically important phenomenon for which no in-depth understanding is currently at hand. Here we report on an explorative study of sputter-deposited WO3 films in a Li-ion-conducting electrolyte by use of cyclic voltammetry, in situ optical transmittance, and impedance spectroscopy. A cycling-dependent decrease of the charge capacity could be accurately modeled by a power-law function, and impedance spectroscopy gave evidence for anomalous diffusion as well a higher charge transfer resistance during deintercalation than during intercalation...
March 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28328194/self-assembly-of-large-gold-nanoparticles-for-surface-enhanced-raman-spectroscopy
#5
Guang Yang, Jagjit Nanda, Boya Wang, Gang Chen, Daniel T Hallinan
Performance of portable technologies from mobile phones to electric vehicles is currently limited by the energy density and lifetime of lithium batteries. Expanding the limits of battery technology requires in situ detection of trace components at electrode-electrolyte interphases. Surface-enhance Raman spectroscopy could satisfy this need if a robust and reproducible substrate were available. Gold nanoparticles (Au NPs) larger than 20 nm diameter are expected to greatly enhance Raman intensity if they can be assembled into ordered monolayers...
March 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28327775/nanospherical-solid-electrolyte-interface-layer-formation-in-binder-free-carbon-nanotube-aerogel-si-nanohybrids-to-provide-lithium-ion-battery-anodes-with-a-long-cycle-life-and-high-capacity
#6
Hyung Cheoul Shim, Ilhwan Kim, Chang-Su Woo, Hoo-Jeong Lee, Seungmin Hyun
Silicon anodes for lithium ion batteries (LiBs) have been attracting considerable attention due to a theoretical capacity up to about 10 times higher than that of conventional graphite. However, huge volume expansion during the cycle causes cracks in the silicon, resulting in the degradation of cycling performance and eventual failure. Moreover, low electrical conductivity and an unstable solid electrolyte interface (SEI) layer resulting from repeated changes in volume still block the next step forward for the commercialization of the silicon material...
March 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28327744/entropic-electrolytes-for-anodic-cycloadditions-of-unactivated-alkene-nucleophiles
#7
Yasushi Imada, Yusuke Yamaguchi, Naoki Shida, Yohei Okada, Kazuhiro Chiba
Unactivated alkenes were previously found to be effective carbon nucleophiles for anodic cycloadditions in lithium perchlorate/nitromethane electrolyte solution. Herein, (7)Li NMR analysis and calorimetric studies clearly illustrate that the entropic effect is essential for these anodic cycloadditions, which has led to the successful screening of novel effective electrolytes.
March 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28327722/impact-of-surface-defects-on-the-surface-charge-of-gibbsite-nanoparticles
#8
Aram Klaassen, Fei Liu, Dirk van den Ende, Frieder Mugele, Igor Siretanu
We use high resolution Atomic Force Microscopy to study the surface charge of the basal plane of gibbsite nanoparticles, with a lateral resolution of approximately 5 nm, in ambient electrolyte of variable pH and salt content. Our measurements reveal surface charge variations on the basal planes that correlate with the presence of topographic defects such as atomic steps. This surface charge heterogeneity, which increases with increasing pH, suggests that for a pH between 6 and 9 the defect sites display a stronger chemical activity than adjacent, apparently atomically smooth regions of the basal plane...
March 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28327718/can-charged-colloidal-particles-increase-the-thermoelectric-energy-conversion-efficiency
#9
Thomas J Salez, Bo Tao Huang, Maud Rietjens, Marco Bonetti, Cécile Wiertel-Gasquet, Michel Roger, Cleber Lopes Filomeno, Emmanuelle Dubois, Régine Perzynski, Sawako Nakamae
Currently, liquid thermocells are receiving increasing attention as an inexpensive alternative to conventional solid-state thermoelectrics for low-grade waste heat recovery applications. Here we present a novel path to increase the Seebeck coefficient of liquid thermoelectric materials using charged colloidal suspensions; namely, ionically stabilized magnetic nanoparticles (ferrofluids) dispersed in aqueous potassium ferro-/ferri-cyanide electrolytes. The dependency of thermoelectric potential on experimental parameters such as nanoparticle concentration and types of solute ions (lithium citrate and tetrabutylammonium citrate) is examined to reveal the relative contributions from the thermogalvanic potential of redox couples and the entropy of transfer of nanoparticles and ions...
March 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28327587/in-situ-characterization-of-the-initial-effect-of-water-on-molecular-interactions-at-the-interface-of-organic-inorganic-hybrid-systems
#10
Sven Pletincx, Lena Trotochaud, Laura-Lynn Fockaert, Johannes M C Mol, Ashley R Head, Osman Karslıoğlu, Hendrik Bluhm, Herman Terryn, Tom Hauffman
Probing initial interactions at the interface of hybrid systems under humid conditions has the potential to reveal the local chemical environment at solid/solid interfaces under real-world, technologically relevant conditions. Here, we show that ambient pressure X-ray photoelectron spectroscopy (APXPS) with a conventional X-ray source can be used to study the effects of water exposure on the interaction of a nanometer-thin polyacrylic acid (PAA) layer with a native aluminum oxide surface. The formation of a carboxylate ionic bond at the interface is characterized both with APXPS and in situ attenuated total reflectance Fourier transform infrared spectroscopy in the Kretschmann geometry (ATR-FTIR Kretschmann)...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28327506/efficacy-and-safety-evaluation-of-a-chlorine-dioxide-solution
#11
Jui-Wen Ma, Bin-Syuan Huang, Chu-Wei Hsu, Chun-Wei Peng, Ming-Long Cheng, Jung-Yie Kao, Tzong-Der Way, Hao-Chang Yin, Shan-Shue Wang
In this study, a chlorine dioxide solution (UC-1) composed of chlorine dioxide was produced using an electrolytic method and subsequently purified using a membrane. UC-1 was determined to contain 2000 ppm of gaseous chlorine dioxide in water. The efficacy and safety of UC-1 were evaluated. The antimicrobial activity was more than 98.2% reduction when UC-1 concentrations were 5 and 20 ppm for bacteria and fungi, respectively. The half maximal inhibitory concentrations (IC50) of H1N1, influenza virus B/TW/71718/04, and EV71 were 84...
March 22, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28326762/facile-synthesis-of-hierarchical-porous-three-dimensional-free-standing-mnco2o4-cathodes-for-long-life-li-o2-batteries
#12
Haitao Wu, Wang Sun, Yan Wang, Fang Wang, Junfei Liu, Xinyang Yue, Zhenhua Wang, Jinshuo Qiao, David W Rooney, Kening Sun
Hierarchical porous three-dimensional MnCo2O4 nanowire bundles were obtained by a universal and low-cost hydrothermal method, which subsequently as a carbon-free and binder-free cathode for Li-O2 cell applications. This system showed a large discharge capacity up to 12919 mAh g-1 at 0.1 mA cm-2 as well as an outstanding rate capability. Under a constrained specific capacity of 500 and 1000 mAh g-1, the Li-O2 batteries could be successfully operated for over 300 and 144 cycles, respectively. Moreover, the charge voltage was markedly decreased to about 3...
March 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28326739/a-case-of-pituitary-stalk-interruption-syndrome-with-intermittent-seizures-as-the-first-presentation
#13
(no author information available yet)
Pituitary stalk interruption syndrome (PSIS) is a congenital disease with isolated growth hormone deficiency (GHD) or multiple anterior pituitary hormone deficiencies (MPHD). The typical clinical manifestations of PSIS are growth retardation, hypoglycemia or delayed pubertal development. However, few reports showed cases of PSIS were diagnosed with acute epileptic seizures accompanied by hyponatremia. Here, we report an 18-year-old female presenting with episodes of intermittent seizures for 13 years. The electrolyte examination on many occasions has shown hyponatremia, even as low as 99...
December 22, 2016: Neuro Endocrinology Letters
https://www.readbyqxmd.com/read/28326201/hyperkalemia-induced-brugada-phenocopy-a-rare-ecg-manifestation
#14
Muhammad Ameen, Ghulam Akbar, Naeem Abbas, Ghazi Mirrani
Brugada syndrome (BrS) is an inherited disorder of cardiac ion channels characterized by peculiar ECG findings predisposing individuals to ventricular arrhythmias, syncope, and sudden cardiac death (SCD). Various electrolyte disturbances and ion channels blocking drugs could also provoke BrS ECG findings without genetic BrS. Clinical differentiation and recognition are essential for guiding the legitimate action. Hyperkalemia is well known to cause a wide variety of ECG manifestations. Severe hyperkalemia can even cause life threatening ventricular arrhythmias and cardiac conduction abnormalities...
2017: Case Reports in Cardiology
https://www.readbyqxmd.com/read/28325999/natural-sea-salt-consumption-confers-protection-against-hypertension-and-kidney-damage-in-dahl-salt-sensitive-rats
#15
Bog-Hieu Lee, Ae-Ri Yang, Mi Young Kim, Sara McCurdy, William A Boisvert
Although sea salts are widely available to consumers nowadays, whether its consumption over refined salt has any real health benefits is largely unknown. This study was conducted to compare hypertension-inducing propensity of natural sea salt (SS) to refined salt (RS) in a well-established animal model of hypertension. Five groups of male Dahl salt-sensitive rats were fed rat chow diet supplemented with various amounts of salt for 15 weeks. The groups were: control (CON, n = 10), 4% RS (RS4), 4% SS (SS4), 8% RS (RS8), 8% SS (SS8) (n = 12 for each group)...
2017: Food & Nutrition Research
https://www.readbyqxmd.com/read/28325788/decompression-illness-with-hypovolemic-shock-and-neurological-failure-symptoms-after-two-risky-dives-a-case-report
#16
Sebastian Klapa, Johannes Meyne, Wataru Kähler, Frauke Tillmans, Henning Werr, Andreas Binder, Andreas Koch
Hypovolemia is known to be a predisposing factor of decompression illness (DCI) while diving. The typical clinically impressive neurological symptoms of DCI may distract from other symptoms such as an incipient hypovolemic shock. We report the case of a 61-year-old male Caucasian, who presented with an increasing central and peripheral neural failure syndrome and massive hypovolemia after two risky dives. Computed tomography (CT) scans of the chest and Magnetic resonance imaging scans of the head revealed multiple cerebral and pulmonary thromboembolisms...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28324726/facile-synthesis-of-hierarchical-mesoporous-weirds-like-morphological-mno2-thin-films-on-carbon-cloth-for-high-performance-supercapacitor-application
#17
Pragati A Shinde, Vaibhav C Lokhande, Taeksoo Ji, Chandrakant D Lokhande
The mesoporous nanostructured metal oxides have a lot of capabilities to upsurge the energy storing capacity of the supercapacitor. In present work, different nanostructured morphologies of MnO2 have been successfully fabricated on flexible carbon cloth by simple but capable hydrothermal method at different deposition temperatures. The deposition temperature has strong influence on reaction kinetics, which subsequently alters the morphology and electrochemical performance. Among different nanostructured MnO2 thin films, the mesoporous weirds composed thin film obtained at temperature of 453K exhibits excellent physical and electrochemical features for supercapacitor application...
March 3, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28324656/investigating-the-influences-of-the-adsorbed-species-on-catalytic-activity-for-hydrogen-oxidation-reaction-in-alkaline-electrolyte
#18
Siqi Lu, Zhongbin Zhuang
Catalysts for hydrogen oxidation reaction (HOR) in alkaline electrolyte are important for anion exchange membrane fuel cells. Understanding the role of OH(-) during the HOR catalytic process in alkaline electrolyte is essential to design highly active HOR catalysts. Here, we attempt to isolate the influence of OH(-) by using surface controlled Pt based nanoparticles as the model catalysts. By comparing the HOR activity between PtNi nanoparticles and acid washed PtNi nanoparticles, which have almost the same hydrogen binding energies but much different OH binding energies, it was found that the HOR activity in alkaline electrolyte is not mainly controlled by the OH adsorption...
March 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28324127/development-of-certified-reference-materials-for-electrolytes-in-human-serum-gbw09124-09126
#19
Liuxing Feng, Jun Wang, Yanjie Cui, Naijie Shi, Haifeng Li, Hongmei Li
Three reference materials, at relatively low, middle, and high concentrations, were developed for analysis of the mass fractions of electrolytes (K, Ca, Na, Mg, Cl, and Li) in human serum. The reference materials were prepared by adding high purity chloride salts to normal human serum. The concentration range of the three levels is within ±20% of normal human serum. It was shown that 14 units with duplicate analysis is enough to demonstrate the homogeneity of these candidate reference materials. The statistical results also showed no significant trends in both short-term stability test for 1 week at 40 °C and long-term stability test for 14 months...
March 21, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28324033/effect-of-moxonidine-on-the-aldosterone-renin-ratio-in-healthy-male-volunteers
#20
Ashraf H Ahmed, Richard D Gordon, Gregory Ward, Martin Wolley, Brett C McWhinney, Jacobus P Ungerer, Michael Stowasser
Background: The most popular screening test for primary aldosteronism (PA) is the plasma aldosterone/ renin ratio (ARR). Medications, dietary sodium, posture and time of day all affect renin and aldosterone levels, and can result in false negative or positive ARRs if not controlled. Most antihypertensive medications affect the ARR and can interfere with interpretation of results. To our knowledge, no study has been undertaken to evaluate the effects of moxonidine on the ARR. Methods: Normotensive, non-medicated male volunteers (n=20) underwent measurement (seated, midmorning) of plasma aldosterone (by HPLC-tandem mass spectrometry), direct renin concentration (DRC), renin activity (PRA), cortisol, electrolytes and creatinine and urinary aldosterone, cortisol, electrolytes and creatinine at baseline, and after one week of moxonidine at 0...
March 16, 2017: Journal of Clinical Endocrinology and Metabolism
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