Read by QxMD icon Read

Energy systems

Samanta Witomska, Włodzimierz Czepa, Zhaoyang Liu, Alessandro Aliprandi, Dawid Pakulski, Piotr Pawluc, Artur Ciesielski, Paolo Samorì
Towards the introduction of fast faradaic pseudocapacitive behavior and the increase of the specific capacitance of carbon-based electrodes, we have covalently functionalized graphene oxide with a redox active thiourea-formaldehyde polymer yield-ing a multifunctional hybrid system. The multiscale physical and chemical characterization of the novel 3-dimensional hy-brid revealed high material's porosity with high specific surface area (402 m2 g-1) and homogeneous element distribution. The presence of multiple functional groups comprising sulphur, nitrogen and oxygen, provide additional contribution of Faradic redox reaction in supercapacity performance, leading to a high effective electrochemical pseudocapacitance...
December 5, 2018: Journal of the American Chemical Society
M A B Melo, W Caetano, E L Oliveira, P M Barbosa, A L B Rando, M M D Pedrosa, V A F Godoi
Photodynamic therapy, by reducing pain and inflammation and promoting the proliferation of healthy cells, can be used to treat recurrent lesions, such as diabetic foot ulcers. Studies using the photosensitizer phthalocyanine, together with the nanostructured copolymeric matrix of Pluronic® and Carbopol® for the treatment of diabetic foot ulcers and leishmaniosis lesions, are showing promising outcomes. Despite their topical or subcutaneous administration, these molecules are absorbed and their systemic effects are unknown...
December 3, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
Shouryadipta Ghosh, Kenneth Tran, Lea M D Delbridge, Anthony J R Hickey, Eric Hanssen, Edmund J Crampin, Vijay Rajagopal
Recent electron microscopy data have revealed that cardiac mitochondria are not arranged in crystalline columns but are organised with several mitochondria aggregated into columns of varying sizes often spanning the cell cross-section. This raises the question-how does the mitochondrial arrangement affect the metabolite distributions within cardiomyocytes and their impact on force dynamics? Here we employed finite element modelling of cardiac bioenergetics, using computational meshes derived from electron microscope images, to address this question...
December 5, 2018: PLoS Computational Biology
Panagiotis C Petris, Stefanos D Anogiannakis, Panagiotis-Nikolaos Tzounis, Doros N Theodorou
A complete thermodynamic analysis of mixtures consisting of molecules with complex chemical constitution can be rather demanding. Kirkwood-Buff theory of solutions allows the estimation of thermodynamic properties which cannot be directly extracted from atomistic simulations, such as the Gibbs energy of mixing (Δmix G). In this work we perform molecular dynamics simulations of n-hexane/ethanol binary mixtures in the liquid state under two temperature-pressure conditions and at various mole fractions. Based on the recently published methodology of Galata et al...
December 5, 2018: Journal of Physical Chemistry. B
Erik Barwa, Milan Oncak, Tobias F Pascher, Thomas Taxer, Christian van der Linde, Martin K Beyer
Hydrated singly charged metal ions doped with carbon dioxide, Mg2+(CO2)-(H2O)n, in the gas phase are valuable model systems for the electrochemical activation of CO2. Here, we study these systems by Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry combined with ab initio calculations. We show that the exchange reaction of CO2 with O2 proceeds fast with bare Mg+(CO2), with a rate coefficient kabs = 1.2×10-10 cm3 s-1, while hydrated species exhibit a lower rate in the range of kabs = 1...
December 5, 2018: Journal of Physical Chemistry. A
Giovanni Bressan, Dale Green, Yohan Chan, Philip C Bulman Page, Garth A Jones, Stephen R Meech, Ismael A Heisler
The excited state energy levels of molecular dimers and aggregates play a critical role in their photophysical behavior and an understanding of the photodynamics in such structures is critical when developing applications such as photovoltaics and optoelectronic devices. Here, exciton transitions in two different covalently bound PBI dimers are studied by two-dimensional electronic spectroscopy (2DES), a powerful spectroscopic method, providing the most complete picture of vibronic transitions in molecular systems...
December 5, 2018: Journal of Physical Chemistry. A
Keyi Chen, Ye Zhang, Chilin Li
Metal-polysulfide batteries are attracting broad attentions as conversion reaction systems of high theoretical energy density and low cost. However, their further applications are hindered by low loading of active species, excess conductive additive and loose (nanostructured) electrode network. Herein, we propose that compact grain stacking and surface fluorination are two crucial factors for achieving high-rate and long-life pyrite (FeS2) cathode enabled by sulfurating ionic liquid wrapped open framework fluorides...
December 5, 2018: ACS Nano
Kallie I Hilsabeck, Jana L Meiser, Mahima Sneha, N Balakrishnan, Richard N Zare
A catalyst enhances a reaction pathway without itself being consumed or changed. Recently, there has been growing interest in the concept of "photon catalysis" in which nonresonant photons, which are neither absorbed nor scattered, promote reactions. The driving force behind this effect is the interaction between the strong electric field associated with a pulsed, focused laser and the polarizability of the reacting system. In this study, the effect of near-infrared, nonresonant radiation on the photodissociation of deuterium iodide is demonstrated...
December 5, 2018: Physical Chemistry Chemical Physics: PCCP
Jianfang Wu, Bo-Wei Pu, Da Wang, Siqi Shi, Ning Zhao, Xiangxin Guo, Xin Guo
Introduction of inorganic solid electrolytes is believed to be an ultimate strategy to dismiss dendritic Li in high-energy Li-metal batteries (LMBs), and garnet-type Li7La3Zr2O12 (LLZO) electrolytes are impressive candidates. However, the current density for stable Li plating/stripping in LLZO is still quite limited. Here we create in-situ formed Li-deficient shields by the high-temperature calcination at 900 °C. By this novel process, the formation of Li2CO3 on LLZO is restrained, and then we successfully obtain Li2CO3-free LLZO after removing the Li-deficient compounds...
December 5, 2018: ACS Applied Materials & Interfaces
Cesar Plascencia, Larry A Curtiss, Cong Liu
Single-site heterogeneous catalysts (SSHC) have received increasing attention due to their well-defined active sites and potentially high specific activity. Detailed computational studies were carried out on a set of potential SSHC's i.e., silica supported metal ions, to investigate the reactivity of these catalysts with H2 as well as to evaluate the performance of density functional theory (DFT) methods in conjunction with triple-ζ quality basis sets (i.e., cc-pVTZ) on reaction energetics. The ions considered include 4d and 5d metals as well as several post-transition metal ions...
December 5, 2018: Journal of Physical Chemistry. A
Mario J Muñoz-Batista, María M Ballari, Anna Kubacka, Orlando M Alfano, Marcos Fernández-García
The combination of kinetic and spectroscopic tools has become a key scientific methodology for the understanding of catalytic behavior but its application in photocatalysis has inherent difficulties due to the nature of the energy source of the reaction. This review article provides an overview of its use by, first, presenting mechanistically derived kinetic formulations and spectroscopic data handling methods including intrinsic expressions for light and, second, highlighting representative examples of application...
December 5, 2018: Chemical Society Reviews
Patricia L Zick, David K Geiger
Hydrogen-bonding interactions play an important role in the rational design of crystal systems with desirable architectures. The crystal structures of benzene-1,2-diaminium sulfate sesquihydrate, C6 H20 N2 2+ ·SO4 2- ·1.5H2 O, (1), benzene-1,3-diaminium tetrachloridozincate(II), (C6 H20 N2 )[ZnCl4 ], (3), and 3-aminoanilinium perchlorate, C6 H9 N2 + ·ClO4 - , (4), are reported. Hydrated salt (1) is a polymorph (space group C2/c) of a previously reported [Anderson et al. (2011). Cryst. Growth Des. 11, 4904-4919] crystalline modification of salt (2) (space group P21 /c)...
December 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
Pengfei Feng, Mengya Kong, Yiwei Yang, Pingru Su, Changfu Shan, Xiaoxi Yang, Jing Cao, Weisheng Liu, Wei Feng, Yu Tang
With the rapid development of information science, it is urgent that memory devices possessing high security, density, and desirable storage ability should be developed. In this work, a smart duplicato-responsive of stimuli and time-gates nanohybrid based on variable valence Eu2+/Eu3+ co-encapsulated has been fabricated and act as active material in the multi-level and multi-dimensional memory devices. The luminescence lifetime of Eu3+ in this nanohybrid performed a stimuli-response due to the energy level of the coordinated ligand could be modulated...
December 5, 2018: ACS Applied Materials & Interfaces
Elke J van Nieuwenhuijzen, Michael F Sailer, Edwin R van den Heuvel, Stephanie Rensink, Olaf C G Adan, Robert A Samson
Dark homogenous fungal-based layers called biofinishes and vegetable oils are key ingredients of an innovative wood protecting system. The aim of this study was to determine which of the vegetable oils that have been used to generate biofinishes on wood will provide carbon and energy for the biofinish-inhabiting fungus Aureobasidium melanogenum, and to determine the effect of the oil type and the amount of oil on the cell yield. Aureobasidium melanogenum was cultivated in shake flasks with different types and amounts of carbon-based nutrients...
December 4, 2018: MicrobiologyOpen
Jin-Seong Cho, Hyung-Woo Jeon, Min-Ha Kim, The K Vo, Jinsoo Kim, Eung-Jun Park, Young-Im Choi, Hyoshin Lee, Kyung-Hwan Han, Jae-Heung Ko
With the exponential growth of the human population and industrial developments, research on renewable energy resources is required to alleviate environmental and economic impacts caused by the consumption of fossil fuels. In this study, we present a synthetic biological application of a wood forming tissue-specific bicistronic gene expression system to improve both the quantity and quality of woody biomass to minimize undesirable growth penalties. Our transgenic poplars, designed to express both PdGA20ox1 (a GA20-oxidase from Pinus densiflora producing bioactive gibberellin, GA) and PtrMYB221 (a MYB transcription factor negatively regulating lignin biosynthesis) under the developing xylem (DX) tissue-specific promoter (i...
December 5, 2018: Plant Biotechnology Journal
Zhihao Qi, Zhen Huang, Feng Xie, Linxi Chen
Mitochondria play a key role in the maintenance of neuronal function by continuously providing energy. Here, we will give a detailed review about the recent developments in regards to dynamin-related protein 1 (Drp1) induced unbalanced mitochondrial dynamics, excessive mitochondrial division, and neuronal injury in neural system dysfunctions and neurodegenerative diseases, including the Drp1 knockout induced mice embryonic death, the dysfunction of the Drp1-dependent mitochondrial division induced neuronal cell apoptosis and impaired neuronal axonal transportation, the abnormal interaction between Drp1 and amyloid β (Aβ) in Alzheimer's disease (AD), the mutant Huntingtin (Htt) in Huntington's disease (HD), and the Drp1-associated pathogenesis of other neurodegenerative diseases such as Parkinson's disease (PD) and amyotrophic lateral sclerosis (ALS)...
December 4, 2018: Journal of Cellular Physiology
Kep Yong Loh, Ziting Wang, Ping Liao
Oncotic cell death or oncosis represents a major mechanism of cell death in ischaemic stroke, occurring in many central nervous system (CNS) cell types including neurons, glia and vascular endothelial cells. In stroke, energy depletion causes ionic pump failure and disrupts ionic homeostasis. Imbalance between the influx of Na+ and Cl- ions and the efflux of K+ ions through various channel proteins and transporters creates a transmembrane osmotic gradient, with ensuing movement of water into the cells, resulting in cell swelling and oncosis...
December 5, 2018: Reviews of Physiology, Biochemistry and Pharmacology
K Sunami, T Nishikawa, K Miyagawa, S Horiuchi, R Kato, T Miyamoto, H Okamoto, K Kanoda
Topological defects have been explored in different fields ranging from condensed matter physics and particle physics to cosmology. In condensed matter, strong coupling between charge, spin, and lattice degrees of freedom brings about emergent excitations with topological characteristics at low energies. One-dimensional (1D) systems with degenerate dimerization patterns are typical stages for the generation of topological defects, dubbed "solitons"; for instance, charged solitons are responsible for high electrical conductivity in doped trans -polyacetylene...
November 2018: Science Advances
Emre Dandıl
Lung cancer is one of the most common cancer types. For the survival of the patient, early detection of lung cancer with the best treatment method is crucial. In this study, we propose a novel computer-aided pipeline on computed tomography (CT) scans for early diagnosis of lung cancer thanks to the classification of benign and malignant nodules. The proposed pipeline is composed of four stages. In preprocessing steps, CT images are enhanced, and lung volumes are extracted from the image with the help of a novel method called lung volume extraction method (LUVEM)...
2018: Journal of Healthcare Engineering
Jiangjiang Duan, Guang Feng, Boyang Yu, Jia Li, Ming Chen, Peihua Yang, Jiamao Feng, Kang Liu, Jun Zhou
Thermogalvanic cells offer a cheap, flexible and scalable route for directly converting heat into electricity. However, achieving a high output voltage and power performance simultaneously from low-grade thermal energy remains challenging. Here, we introduce strong chaotropic cations (guanidinium) and highly soluble amide derivatives (urea) into aqueous ferri/ferrocyanide ([Fe(CN)6 ]4- /[Fe(CN)6 ]3- ) electrolytes to significantly boost their thermopowers. The corresponding Seebeck coefficient and temperature-insensitive power density simultaneously increase from 1...
December 4, 2018: Nature Communications
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"