bluuebunny/crossref_metadata_2025_split huggingface dataset:
Wireless Electric Energy Transmission through Various Isolated Solid Media Based on Triboelectric Nanogenerator
Authors: Liu Guanlin , Chen Jie , Tang Qian , Feng Li , Yang Hongmei , Li Jien , Xi Yi , Wang Xue , Hu Chenguo 
Published: January 2018

AbstractWireless electric energy transmission is an important energy supply technology. However, most wireless energy supply based on electromagnetic induction cannot be used for energy transmission through a metal chamber. Herein, a novel idea for wireless electric energy transmission through various isolated solid media based on triboelectric nanogenerator (TENG) is presented. The electric energy is first transformed into mechanical vibration energy in mechanical wave that can propagate well in solid medium, and then the vibration energy is harvested by a TENG. By employing the spring steel sheets and freestanding triboelectric‐layer structure, the vibration TENG as an energy conversion unit has the advantages of high efficiency and facilitation, boosting this wireless energy transmission technology to be an alternative way of delivering electric energy through metal medium. The working principle and output performance have been systematically studied. A commercial capacitor can be charged from 0 to 10 V in 33 and 86 s isolated by an acrylic plate and a copper plate in thickness of 3 mm, respectively. The wireless electric transmission technology is also applied to deliver electric energy into a vacuum glove box and across glass wall successfully. This novel technology has great potential applications in implantable microelectronic devices, encrypted wireless communication, and even nondestructive testing.
Lewis Acid‐Catalyzed Yne‐Carbonyl Metathesis of Ynamides and Cyclobutanones: Facile Synthesis of Functionalized Alkylidenecyclobutanes
Authors: Sun Yu‐Li , Chen Ling , Cao Jian , Sun Feng‐Na , Xu Zheng , Zheng Zhan‐Jiang , Cui Yu‐Ming , Xu Li‐Wen 
Published: January 2018

AbstractAn atom‐economical strategy for the synthesis of functionalized alkylidenecyclobutanes (ACBs) via Lewis acid‐catalyzed yne‐carbonyl metathesis of ynamides and cyclobutanones is described. This strategy features mild reaction conditions, ready availability of starting materials, and broad functional group tolerability. Furthermore, the imide group is easily converted to acid, ester, and amide, thus providing an efficient access to various functionalized ACBs.
RNA Cloaking by Reversible Acylation
Authors: Kadina Anastasia , Kietrys Anna M. , Kool Eric T. 
Published: January 2018

AbstractWe describe a selective and mild chemical approach for controlling RNA hybridization, folding, and enzyme interactions. Reaction of RNAs in aqueous buffer with an azide‐substituted acylating agent (100–200 mm) yields several 2′‐OH acylations per RNA strand in as little as 10 min. This poly‐acylated (“cloaked”) RNA is strongly blocked from hybridization with complementary nucleic acids, from cleavage by RNA‐processing enzymes, and from folding into active aptamer structures. Importantly, treatment with a water‐soluble phosphine triggers a Staudinger reduction of the azide groups, resulting in spontaneous loss of acyl groups (“uncloaking”). This fully restores RNA folding and biochemical activity.
Silica‐Supported Pentamethylcyclopentadienyl Ytterbium(II) and Samarium(II) Sites: Ultrahigh Molecular Weight Polyethylene without Co‐Catalyst
Authors: Allouche Florian , Chan Ka Wing , Fedorov Alexey , Andersen Richard A. , Copéret Christophe 
Published: January 2018

AbstractDesigning highly active supported ethylene polymerization catalysts that do not require a co‐catalyst to generate electrophilic metal alkyl species is still a challenge despite its industrial relevance. Described herein is the synthesis and characterization of well‐defined silica‐supported cyclopentadienyl LnII sites (Ln=Yb and Sm) of general formula [(≡SiO)LnCp*]. These well‐defined surface species are highly activite towards ethylene polymerization in the absence of added co‐catalyst. Initiation is proposed to occur by single electron transfer.
Virginal breast hypertrophy in a patient with Beckwith–Wiedemann syndrome
Authors: Szymańska Edyta , Moszczyńska Elżbieta , Polnik Dariusz , Szymańska Sylwia , Jurkiewicz Elżbieta , Pyzlak Michał , Armata Michał , Walewska‐Wolf Małgorzata , Kaliciński Piotr , Rokicki Dariusz , Szalecki Mieczysław 
Published: January 2018

Key Clinical MessageVirginal breast hypertrophy is a multidisciplinary condition including surgical, pediatric, and endocrine/gynecological disciplines, and its successful diagnosis and management requires complex, team approach.
Fracture of a femoral hemodialysis catheter during placement in a man with metastatic cancer
Authors: Li Xiang‐Yang , He Hai‐Yan , Pai Pearl 
Published: January 2018

Key Clinical MessageCentral venous catheterization can be challenging in patients that had undergone repeated catheter placements. Ultrasound scan may overlook venous stenosis which is better visualized using venography. The use of venography should be considered to assess for venous stenosis or vascular anomalies in individuals with multiple catheterizations or in close proximity to cancer.
Fatal cardiac arrhythmia caused by tumor lysis in a patient with diffuse large B‐cell lymphoma upon start of R‐CHOP
Authors: Sørensen Nina , Jensen Paw , Clasen‐Linde Erik , Larsen Jacob Moesgaard , El‐Galaly Tarec 
Published: January 2018

Key Clinical MessageTumor lysis syndrome is rare in diffuse large cell lymphoma, but it is important to recognize the risk in patients with massive tumor burden and reduced kidney function. Very intense vigilance can be necessary despite adequate prophylactic measures and certain drugs may exacerbate electrolyte derangements.
Ethyl Lactate Synthesis by Catalytic Membranes in a Pervaporation‐Assisted Membrane Reactor
Authors: Nigiz Filiz Ugur , Hilmioglu Nilufer Durmaz 
Published: January 2018

AbstractA poly(styrenesulfonic acid)‐carboxymethylcellulose (PSSA‐CMC) blend catalytic membrane was prepared for ethyl lactate production in a pervaporation‐aided membrane reactor. The effects of PSSA/CMC concentration, initial molar ratio, and temperature on acid conversion were evaluated. Additionally, the separation performance of membrane was investigated as a function of flux and separation factor. Increasing the temperature enhanced lactic acid conversion at constant alcohol:acid ratio.
Stable Organic (Bi)Radicals by Delocalization of Spin Density into the Electron‐Poor Chromophore Core of Isoindigo
Authors: Rausch Rodger , Schmidt David , Bialas David , Krummenacher Ivo , Braunschweig Holger , Würthner Frank 
Published: January 2018

AbstractThe first isoindigo (bi)radicals were obtained by proton coupled oxidation of their 4‐hydroxyaryl substituted precursors. Optical and magnetic spectroscopic studies revealed a singlet open‐shell biradicaloid electronic ground state for the bisphenoxyl‐isoindigo (<s2>=1.20) with a small singlet–triplet energy gap of 0.065 eV and a large biradical character of y=0.79 that was corroborated by temperature‐dependent EPR spectroscopy and quantum chemical calculations. The concept of kinetic blocking of the radical centers and delocalization of spin density into the electron‐withdrawing chromophore core of isoindigo offers an entry into a new class of exceptionally stable open‐shell functional materials based on organic colorants.
C−C Bond Formation of Mg‐ and Zn‐Activated Carbon Dioxide
Authors: Miller Glenn B. S. , Uggerud Einar 
Published: January 2018

AbstractGas‐phase activation of CO2 by chloride tagged metal atoms, [ClM]− (M=Mg, Zn), has been investigated by mass spectrometry and high‐level quantum chemistry. Both metals activate CO2 with significant bending of the CO2 moiety to form complexes with the general formula [ClM,CO2]−. The structure of the metal–CO2 complex depends on the method of formation, and the energy landscapes and reaction dynamics have been probed by collisional induced dissociation and thermal ion molecule reactions with isotopically labeled species. Having established these structural relationships, the gas‐phase reactivity of [ClM(κ2‐O2C)]− with acetaldehyde (here considered a carbohydrate mimic) was then studied. Formation of lactate and enolate‐pyruvate complexes are observed, showing that CO2 fixation by C−C bond formation takes place. For M=Zn, even formation of free pyruvate ([C3H3O3]−) is observed. Implications of the observed CO2 reactivity for the electrochemical conversion of carbon dioxide, and to biochemical and artificial photosynthesis is briefly discussed. Detailed potential energy diagrams obtained by the quantum chemical calculations offer models consistent with experimental observation.
Asymmetric Catalytic Double Michael Additions for the Synthesis of Spirooxindoles
Authors: Kang Tengfei , Zhao Peng , Yang Jian , Lin Lili , Feng Xiaoming , Liu Xiaohua 
Published: January 2018

AbstractAsymmetric cascade double Michael additions to construct 2′‐substituted 3,3′‐spirooxindoles by using a chiral guanidine organocatalyst has been developed. A series of spirooxindole derivatives containing dihydrofuran or pyrrolidine subunits were obtained with good to excellent diastereo‐ and enantioselectivities. The method showed great tolerance of a number of aromatic and aliphatic alkynones. The strategy gave access to the asymmetric synthesis of (−)‐salacin for the first time.
Intermolecular Desymmetrizing Gold‐Catalyzed Yne–Yne Reaction of Push–Pull Diarylalkynes
Authors: Weingand Vanessa , Wurm Thomas , Vethacke Vanessa , Dietl Martin C. , Ehjeij Daniel , Rudolph Matthias , Rominger Frank , Xie Jin , Hashmi A. Stephen K. 
Published: January 2018

AbstractPush–pull diaryl alkynes are dimerized in the presence of a cationic gold catalyst. The polarized structure of the applied starting materials enables the generation of a highly reactive vinyl cation intermediate in an intermolecular reaction. Trapping of the vinyl cation by a nucleophilic attack of the electron‐poor aryl unit then leads to the selective formation of highly substituted naphthalenes in a single step and in complete atom economy.
Design of Metal Oxide Nanoparticles via Continuous Hydrothermal Synthesis
Authors: Türk Michael 
Published: January 2018

AbstractDie außergewöhnlichen Eigenschaften von nahe‐ und überkritischem Wasser ermöglichen die Herstellung von metalloxidischen Nanopartikeln durch kontinuierliche hydrothermale Synthese. Dieser Prozess basiert auf dem Vermischen einer kalten, wässrigen Metallsalzlösung mit heißem Wasser unter Druck. Im Beitrag werden zunächst die für das Verständnis des Prozesses notwendigen Grundlagen und der aktuelle Stand des Wissens vorgestellt. Daran anschließend werden ausgewählte experimentelle und theoretische Ergebnisse präsentiert und diskutiert. Die wichtigsten Resultate werden zusammengefasst und ein Ausblick auf zukünftige Forschungsarbeiten wird gegeben.
The impact of illness‐related shame on psychological health and social relationships: Testing a mediational model in students with chronic illness
Authors: Trindade Inês A. , Duarte Joana , Ferreira Cláudia , Coutinho Mariana , Pinto‐Gouveia José 
Published: January 2018

This study explores the impact of illness‐related shame on the quality of social relationships and psychological health in chronic patients. We aimed to examine the roles of fear of receiving compassion from others and experiential avoidance as potential mediators of this relationship. Although some studies have demonstrated the negative impact of chronic illness‐related shame on psychological functioning, the mechanisms that may underlie this link remain understudied.The sample was comprised by 115 college students, which had been diagnosed with at least 1 chronic illness. Participants completed self‐report measures on an online platform. This study's design was cross‐sectional. A path analysis was conducted using structural equation modelling.Results showed that the impact of illness‐related shame on both psychological health (R2 = .45) and the quality of social relationships (R2 = .33) was fully accounted by fear of compassion from others and experiential avoidance. This model revealed an excellent fit. Fear of receiving compassion from others was the main mediator of the illness‐related shame link with the quality of social relationships (β = −.22). The main mediator of the association between shame‐related chronic illness and psychological health was experiential avoidance (β = −.21).This study shed light on possible psychological mechanisms linking feelings of shame associated with having a chronic condition and impaired social relationships and mental health. On one hand, resisting feelings of compassion and care from others and, on the other hand, avoiding difficult internal experiences and situations that might trigger them seem to underlie the impact of shame on psychological and social functioning in chronic patients.
Reciprocal associations of pain and post‐traumatic stress symptoms after whiplash injury: A longitudinal, cross‐lagged study
Authors: Ravn S.L. , Sterling M. , Lahav Y. , Andersen T.E. 
Published: January 2018

AbstractBackgroundThe objectives of the current study were to investigate (1) the longitudinal, reciprocal associations between pain and post‐traumatic stress symptoms as proposed by the mutual maintenance model, and (2) to assess the predictive value of the three clusters of post‐traumatic stress, where the model revealed that post‐traumatic stress symptoms maintained pain in a consecutive cohort of whiplash‐injured.MethodsParticipants (n = 253; 66.4% women) were people with WAD grades I–III following motor vehicle crashes in Australia. Pain and post‐traumatic stress symptoms were assessed by questionnaires over the course of a year (at baseline (<4 weeks), 3, 6 and 12 months post‐injury). The objectives were tested using auto‐regressive cross‐lagged modelling and two additional structural equation models.ResultsThe analyses revealed that post‐traumatic stress symptoms at baseline predicted an increase in pain between baseline and 3 months and that post‐traumatic stress symptoms at 6 months predicted an increase in pain between 6 and 12 months, beyond the stability of pain over time. Furthermore, hyperarousal at baseline significantly predicted pain at 3 months and hyperarousal at 6 months significantly predicted pain at 12 months with 16 and 23% explained variance, respectively. [Correction added on 2 March 2018 after first online publication: the explained variance for hyperarousal symptoms at 6 months was previously given incorrectly and has been corrected to 23% in this version.]ConclusionsThe results point to a temporal main effect of post‐traumatic stress symptoms on pain over and above the stability of pain itself within the first 3 months post‐injury and again in the chronic phase from 6 to 12 months with hyperarousal symptoms driving these effects. From 3 to 6 months, there was a slip in the maintenance patterns with no cross‐lagged effects.SignificanceInvestigating mutual maintenance of pain and PTSS in whiplash, the present study found evidence suggesting a maintaining effect of PTSS on pain within the first 3 months post‐injury and from 6 to 12 months driven by hyperarousal, highlighting the importance of addressing PTSS.
A Sensitive Electrochemical Sensor for Voltammetric Determination of Ganciclovir Based on Au‐ZnS Nanocomposite
Authors: Yari Abdollah , Shams Azim 
Published: January 2018

AbstractAn electrode modified with ZnS and gold nanoparticles (Au‐ZnS NPs) is introduced for highly sensitive voltammetric determination of ganciclovir (GCV). Surface structure and topography of the modified electrode was studied by SEM, EDX and XRD techniques. Electrochemical oxidation of GCV was investigated by cyclic (CV) and square wave voltammetry (SWV) in Briton‐Robinson buffer solution (pH 1.5). The results showed that electrochemical oxidation of GCV at the Au‐ZnS modified glassy carbon electrode (GCE) is irreversible and exhibited diffusion controlled electrode process over the pH range from 1.0 to 6.0. The oxidation potential peak and pH relationship showed that electrons and protons were transferred simultaneously over the electrochemical oxidation process. Using the proposed sensor, the linear calibration curves were obtained in the ranges of 0.04–1.50 μM and 1.5–70.0 μM with detection limit of 0.01 μM GCV by SWV technique. The modified electrode was successfully applied as a sensitive, reproducible and repeatable sensor for determination of the trace amount of GCV in human serum, urine and cymevene vials. Reasonable results were obtained from comparing the measurements of the real samples by the new sensor to high performance liquid chromatography (HPLC) as a standard method.
Syngas Production from Chemical‐Looping Reforming of Methane Using Iron‐Doped Cerium Oxides
Authors: Yan Yuyuan , Xu Long , Wang Li , Fu Ke , Tang Mingchen , Fan Maohong , Ma Xiaoxun 
Published: January 2018

AbstractA series of iron‐doped cerium oxide oxygen carriers CexFe10−xOδ (x=9, 7, 5) were prepared by citric acid sol‐gel method and characterized by X‐ray powder diffraction (XRD), Brunauer Emmett Teller (BET), Temperature‐Programmed Reduction, and Oxidation (H2‐TPR/O2‐TPO). The reaction activity and cycle stability of oxygen carriers with methane at 850 °C were investigated in a fixed bed reactor and the capacity of oxygen storage was studied by a chemical adsorption instrument. Results showed that methane conversion and oxygen storage capacity of oxygen carriers were improved significantly because of the doping iron oxide. For thermostatic cycle, Ce7Fe3Oδ showed considerable durability. A three stages isothermal reaction mechanism was proposed.
Does the PPP condition hold for oil‐exporting countries? A quantile cointegration regression approach
Authors: Lyon Matthew , Olmo Jose 
Published: January 2018

AbstractThis paper examines the legitimacy of the Purchasing Power Parity condition applied to the quantile process for 12 oil‐exporting countries: Algeria, Angola, Canada, Colombia, Indonesia, Iran, Kazakhstan, Kuwait, Mexico, Nigeria, Norway, and Russia. The application of quantile unit root inference methods to test the specification of the PPP condition in the quantile process yields limited support to the equilibrium condition. However, the application of quantile cointegration methods that estimate the equilibrium relationship between national prices and the nominal exchange rate is much more supportive of a generalized PPP condition that varies across countries and quantiles. Our empirical findings suggest that the distribution of the nominal exchange rate reflects a nonlinear equilibrium relationship between national prices that varies widely between the central and tail quantiles and is country‐specific.
Reassessing the relationship between the financial sector and economic growth: Dynamic panel evidence
Authors: Alexiou Constantinos , Vogiazas Sofoklis , Nellis Joseph G. 
Published: January 2018

AbstractHistorically, the development of the financial sector has been an indispensable driver of economic growth. In the aftermath of the Great Recession, there is a pressing need to reassess the role of the financial sector in the determination of economic growth. Using a dynamic panel framework, our analysis covers 34 European and Commonwealth of Independent States economies for the period 1998–2014 and controls for the role of macroeconomic and institutional variables. Our evidence suggests that the potential benefits of the financial sector finance may have dramatically reversed in recent years, resulting in “un‐creative destruction.” The results suggest, tentatively, that there has been a severance of the link between the financial sector and the real economy. The results, however, vary according to the level of economic development across the European and Commonwealth of Independent States economies. In the case of developing market economies, the financial intermediation proxies are not significant in explaining economic growth. The effect of changes in investment expenditure, the money supply, wages, unit labour costs, and trade openness is found to be strong and in line with a priori expectations across all country samples. Notably, government consumption is also found to be a significant driver of economic growth, except in the developing market economies in the period following the Great Recession. In line with the growing consensus in other research areas, we provide evidence of a robust role for the institutional framework proxied by the quality of governance in determining economic development.
The effect of maternal exposure to di‐(2‐ethylhexyl)‐phthalate on fetal cardiac development in mice
Authors: Tang Changqing , Deng Yuxin , Duan Hongyu , Zhang Yi , Li Yifei , Qiu Dajian , Zhou Kaiyu , Hua Yimin , Wang Chuan 
Published: January 2018

AbstractAccumulating evidence has suggested a link between maternal di‐(2‐ethylhexyl)‐phthalate (DEHP) exposure and various developmental abnormalities. However, the evidence regarding the effect of maternal DEHP exposure on fetal cardiac development is scarce. The present study aimed to determine the effect of maternal DEHP exposure on fetal cardiac development in mice and explore the possible involved mechanism preliminarily. The C57BL mice were randomly divided into four groups: the vehicle group (corn oil, n = 10), 250 mg kg–1 DEHP group (n = 15), 500 mg kg–1 DEHP group (n = 20) and 1 g kg–1 DEHP group (n = 20). Pregnant dams in different group received respective intervention by gavage once daily from embryonic day (E)6.5 to E14.5. Maternal weights were monitored every day and samples were collected at E15.5. Hematoxylin and eosin staining was used to examine fetal cardiac malformations. Real‐time quantitative polymerase chain reaction and western blot were applied to detect peroxisome proliferator‐activated receptor (PPAR)α/PPARγ/Nkx2.5/Gata4/Tbx5/Mef2c/Chf1 mRNA and protein expression, respectively. Maternal DEHP exposure significantly decreased maternal body weight, fetal weight and placental weight, and remarkably elevated fetal cardiac malformations rate. The phenotypes of cardiac anomalies mainly include septal defects, ventricular myocardium noncompaction and cardiac hypoplasia. Higher doses DEHP (500 mg kg–1 and 1 g kg–1) could significantly decreased fetal cardiac Gata4/Mef2c/Chf1 expression, while PPARγ expression was upregulated. Maternal exposure to higher doses of DEHP could result in fetal cardiac development malformations in mice and it might have resulted from the inhibition of cardiac GATA4/Mef2c/Chf1 expression via PPARγ activation.