bluuebunny/crossref_metadata_2025_split huggingface dataset:
Activation‐Dependent Breathing in a Flexible Metal–Organic Framework and the Effects of Repeated Sorption/Desorption Cycling
Authors: Engel Emile R. , Jouaiti Abdelaziz , Bezuidenhout Charl X. , Hosseini Mir Wais , Barbour Leonard J. 
Published: June 2017

AbstractA non‐interpenetrated metal–organic framework with a paddle‐wheel secondary building unit has been activated by direct thermal evacuation, guest exchange with a volatile solvent, and supercritical CO2 drying. Conventional thermal activation yields a mixture of crystalline phases and some amorphous content. Exchange with a volatile solvent prior to vacuum activation produces a pure breathing phase with high sorption capacity, selectivity for CO2 over N2 and CH4, and substantial hysteresis. Supercritical drying can be used to access a guest‐free open phase. Pressure‐resolved differential scanning calorimetry was used to confirm and investigate a systematic loss of sorption capacity by the breathing phase as a function of successive cycles of sorption and desorption. A corresponding loss of sample integrity was not detectable by powder X‐ray diffraction analysis. This may be an important factor to consider in cases where flexible MOFs are earmarked for industrial applications.
Iridium‐Catalyzed Enantioselective Allylic Substitution of Aliphatic Esters with Silyl Ketene Acetals as the Ester Enolates
Authors: Jiang Xingyu , Hartwig John F. 
Published: June 2017

AbstractEnantioselective allylic substitution with enolates derived from aliphatic esters under mild conditions remains challenging. Herein we report iridium‐catalyzed enantioselective allylation reactions of silyl ketene acetals, the silicon enolates of esters, to form products containing a quaternary carbon atom at the nucleophile moiety and a tertiary carbon atom at the electrophile moiety. Under relatively neutral conditions, the allylated aliphatic esters were obtained with excellent regioselectivity and enantioselectivity. These products were readily converted into primary alcohols, carboxylic acids, amides, isocyanates, and carbamates, as well as tetrahydrofuran and γ‐butyrolactone derivatives, without erosion of enantiomeric purity.
DNA‐Hydrogele aus Plasmid‐DNA
Authors: Nöll Tanja , Wenderhold‐Reeb Sabine , Schönherr Holger , Nöll Gilbert 
Published: June 2017

AbstractDNA‐Hydrogele sind aufgrund ihrer Biokompatibilität und ihrer biologischen Abbaubarkeit für verschiedene biomedizinische Anwendungen von großem Interesse. Bisher werden DNA‐Hydrogele aus synthetischen Bausteinen hergestellt, was mit hohen Kosten verbunden ist. Als Alternative wird hier die Herstellung von DNA‐Hydrogelen aus Plasmid‐DNA beschrieben. Plasmid‐DNA kann durch Fermentation in großem Maßstab hergestellt werden. Die gewünschten linearen DNA‐Bausteine werden dann durch enzymatischen Verdau erhalten. Die Gelierung erfolgt durch die Ausbildung kovalenter Bindungen zwischen einzelnen Bausteinen durch enzymatische Ligation. Hier wird zum ersten Mal die Herstellung reiner DNA‐Hydrogele aus Plasmid‐DNA vorgestellt. Rheologische Untersuchungen bestätigen, dass die so hergestellten DNA‐Hydrogele Speichermoduli von G′ >100 Pa besitzen.
Energy Transfer between Spatially Separated Entangled Molecules
Authors: Zhong Xiaolan , Chervy Thibault , Zhang Lei , Thomas Anoop , George Jino , Genet Cyriaque , Hutchison James A. , Ebbesen Thomas W. 
Published: June 2017

AbstractLight–matter strong coupling allows for the possibility of entangling the wave functions of different molecules through the light field. We hereby present direct evidence of non‐radiative energy transfer well beyond the Förster limit for spatially separated donor and acceptor cyanine dyes strongly coupled to a cavity. The transient dynamics and the static spectra show an energy transfer efficiency approaching 37 % for donor–acceptor distances ≥100 nm. In such systems, the energy transfer process becomes independent of distance as long as the coupling strength is maintained. This is consistent with the entangled and delocalized nature of the polaritonic states.
Pristine DNA Hydrogels from Biotechnologically Derived Plasmid DNA
Authors: Nöll Tanja , Wenderhold‐Reeb Sabine , Schönherr Holger , Nöll Gilbert 
Published: June 2017

AbstractDNA hydrogels are of great interest for a variety of biomedical applications owing to their biocompatibility and biodegradability but the advantages of DNA hydrogels have not been exploited yet because of their limited availability. Thus far, DNA hydrogels have been prepared from synthetically derived building blocks, and their production on large scale would be far too expensive. As an alternative, here the generation of DNA hydrogels from plasmid DNA is reported. Plasmid DNA can be prepared on large scale at reasonable costs by a fermentation process. The desired linear DNA building blocks are then obtained from the plasmid DNA by enzymatic digestion. Gel formation is carried out by covalent bond formation between individual building blocks via enzymatic ligation. The generation of pristine DNA hydrogels from plasmid DNA is thus presented for the first time. The viscoelastic properties of the hydrogels were studied by rheology, which confirmed that the gels have storage moduli G′ of >100 Pa.
Macrophage Migration Inhibitory Factor Induces Inflammation and Predicts Spinal Progression in Ankylosing Spondylitis
Authors: Ranganathan Vidya , Ciccia Francesco , Zeng Fanxing , Sari Ismail , Guggino Guiliana , Muralitharan Janogini , Gracey Eric , Haroon Nigil 
Published: June 2017

ObjectiveTo investigate the role of macrophage migration inhibitory factor (MIF) in the pathogenesis of ankylosing spondylitis (AS).MethodsPatients who met the modified New York criteria for AS were recruited for the study. Healthy volunteers, rheumatoid arthritis patients, and osteoarthritis patients were included as controls. Based on the annual rate of increase in modified Stoke AS Spine Score (mSASSS), AS patients were classified as progressors or nonprogressors. MIF levels in serum and synovial fluid were quantitated by enzyme‐linked immunosorbent assay. Predictors of AS progression were evaluated using logistic regression analysis. Immunohistochemical analysis of ileal tissue was performed to identify MIF‐producing cells. Flow cytometry was used to identify MIF‐producing subsets, expression patterns of the MIF receptor (CD74), and MIF‐induced tumor necrosis factor (TNF) production in the peripheral blood. MIF‐induced mineralization of osteoblast cells (SaOS‐2) was analyzed by alizarin red S staining, and Western blotting was used to quantify active β‐catenin levels.ResultsBaseline serum MIF levels were significantly elevated in AS patients compared to healthy controls and were found to independently predict AS progression. MIF levels were higher in the synovial fluid of AS patients, and MIF‐producing macrophages and Paneth cells were enriched in their gut. MIF induced TNF production in monocytes, activated β‐catenin in osteoblasts, and promoted the mineralization of osteoblasts.ConclusionOur findings indicate an unexplored pathogenic role of MIF in AS and a link between inflammation and new bone formation.
Three‐Dimensional Impact Angle Constrained Guidance Laws with Fixed‐Time Convergence
Authors: Gao Jiwei , Cai Yuan‐Li 
Published: June 2017

AbstractIn this paper, three dimensional coupled engagement dynamics are firstly transformed into a state‐space form without decoupling three dimensional engagement dynamics into two mutually orthogonal planes to avoid degrading the performance of the guidance law. Specially, fixed‐time guidance laws are proposed to guarantee that the line‐of‐sight (LOS) angular rates can be steered to zero before the final time of the guidance process at the same time. The exact convergence time can be set beforehand with respect to the LOS rates, and it is independent of initial conditions with respect to the guidance system. Moreover, impact angle constraint is taken into account, and these guidance laws are robust against maneuvering targets by sliding mode techniques. Simulation results validate the effectiveness of the proposed algorithms.
Distributed State Estimation of Smart Grids with Packet Losses
Authors: Rana Md Masud , Li Li , Su Steven W. 
Published: June 2017

AbstractThis paper explores the problem of distributed state estimation including packet losses for the environment‐friendly renewable microgrid incorporating electricity generating circuits. The problem is becoming critical due to the global warming, increasing green house gas emissions, and practical infeasibility with computational burden of the large‐scale centralized power system monitoring. To address the impending problem, a novel distributed state estimation algorithm is derived in the context of smart grids. Specifically, after modelling the microgrid, this paper proposes a local state estimation algorithm considering packet losses. Then a novel optimal weighting factor calculation method for the global state estimation is proposed. Particularly, it can automatically adjust the optimal weighting factors for different sensor measurements based on the observation. Simulations results show that the desired state estimation accuracy is achieved.
Radiation from accelerated electrons: Simulation in four‐dimensions
Authors: Fazarinc Zvonko 
Published: June 2017

AbstractThis educational paper caters to engineers wishing to penetrate the complexity of electrodynamics. Only a computer simulation can provide the fourth dimension and to justify the title we develop the linkage between the theory and the relevant executable algorithms. These can provide unique insights into the internal events and a temporal evolution can lead to a deeper understanding of radiation phenomena arising from nature's first principles. There is no escape from the relativistic overhead associated with motion and some effort is expended on supporting the uninitiated reader.
GPMS: An educational supportive graduation project management system
Authors: Awad Mamoun 
Published: June 2017

AbstractSenior Graduation Project highlights a significant milestone for undergraduate and graduate students in their journey of perusing their scientific degrees. It is considered a must‐complete requirement in most colleges. No doubt that managing the educational tasks, such as selecting projects, creating rubrics, scheduling, submitting reports, resource managements, assessment, etc., involved in senior projects can be challenging for students and educators. In this paper, we present an innovative Graduation Project Management System (GPMS) to keep track of different senior project educational processes starting from selecting projects going through grading until assessment. GPMS is equipped with data analytic gadget to monitor students’ pedagogical habits. This online system is based on open source technologies, namely, Java, Apache/Tomcat, WEKA, and MySql database management system (DBMS), and it is very flexible, adaptable, and configurable for most colleges.
Angupyrones A – E, α‐Pyrone Analogues with ARE‐Activation from a Sponge‐Associated Fungus Truncatella angustata
Authors: Zhao Yang , Liu Dong , Proksch Peter , Yu Siwang , Lin Wenhan 
Published: June 2017

TLC‐DPPH guided fractionation of a sponge‐associated fungus Truncatella angustata with a solid culture resulted in the isolation of five new α‐pyrone‐based analogues namely angupyrones A – E (1 – 5), and 3‐ethyl‐4‐hydroxy‐6‐methyl‐2‐pyrone. Their structures were determined on the basis of extensive spectroscopic analyses, including the modified Mosher's method, bulkiness rule, and specific rotation for the configurational assignments. Angupyrones A – E exhibited moderate antioxidant response element activation in HepG2C8 cells, while the preliminary structure‐activity relationship was discussed.
A novel mechanical mitral valve replacement using Sapien XT
Authors: Koehle Megan , Strote Justin A. , Guadagnoli Mark , Oldemeyer J. Bradley 
Published: June 2017

AbstractPatient PresentationWe report the case of a 66 year old female who presented to our institution fourteen years after receiving a St. Jude Mechanical Mitral Valve Replacement. She presented in refractory NYHA class IV congestive heart failure with comorbidities of acute renal failure, liver failure, and mental status changes. She was found to have immobility of one of the mitral valve disks with resultant severe mitral stenosis with a mean pressure gradient of 12 mmHg.Evaluation and ManagementThe patient was found to have an STS predicted mortality of 39% with redo surgical MVR, and evaluation by the valve team led to a recommendation of a hybrid surgical and transcatheter procedure. The patient underwent femoral bypass and hypothermia with a sternotomy and left atrial approach. The mechanical discs were removed utilizing needle drivers without removal of the St. Jude ring. Subsequently, a 26 mm Edwards Sapien XT valve was deployed under direct and fluoroscopic visualization.The patient had an event free post‐operative course, and one year following the procedure has had an outstanding clinical response with NYHA class II congestive heart failure. Her echocardiogram reveals normal valve function with a MPG of 4 mmHg without mitral regurgitation.ConclusionTransatrial hybrid TMVR within the ring of a St. Jude mechanical mitral valve appears to be a feasible procedure which may be used in the future to decrease morbidity and mortality associated with high‐risk redo‐MVR in patients with mechanical mitral valve prostheses.
The Synthesis and Evaluation of Fluoro‐, Trifluoromethyl‐, and Iodomuscimols as GABA Agonists
Authors: Abdul Manan Mohd Abdul Fatah , Cordes David B. , Slawin Alexandra M. Z. , Bühl Michael , Liao Vivian W. Y. , Chua Han. C. , Chebib Mary , O'Hagan David 
Published: June 2017

AbstractHalogenated analogues of the neurotoxic alkaloid muscimol were prepared with fluorine, iodine or trifluoromethyl at the 4 position of the isoxazole ring system. These compounds were investigated as agonists for GABAA receptors. Only the C‐4 fluorine‐containing analogue proved to be an active compound in these assays. The fluoro analogue was less active than muscimol, however it showed differential activity between synaptic (α1β2γ2) and extrasynaptic (α4β2γ) GABAA receptors, having a similar potency to the neurotransmitter GABA for the extrasynaptic (α4β2γ) receptor.
Electrochemical Graphitization: An Efficient Conversion of Amorphous Carbons to Nanostructured Graphites
Authors: Jin Xianbo , He Rui , Dai Sheng 
Published: June 2017

AbstractThis concept paper describes a new electrochemical method for the graphitization of amorphous carbons. The graphitization is achieved by a simple cathodic polarization of the carbons at merely ≈1100 K in molten CaCl2. This electrochemical process is applicable to both graphitizable and non‐graphitizable carbons, generating porous graphitic structures of high‐crystallinity nanosheets. The transformation of carbon blacks, microspheres, and fibers to porous graphites, hollow graphite spheres, and pipes with porous shells have been demonstrated and the potential graphitization mechanism discussed.
Heart failure in patients admitted for acute coronary syndromes: A report from a large national registry
Authors: Jeger Raban V. , Pfister Otmar , Radovanovic Dragana , Eberli Franz R. , Rickli Hans , Urban Philip , Pedrazzini Giovanni , Stauffer Jean‐Christophe , Nossen Jörg , Erne Paul ,   for the AMIS‐Plus Investigators
Published: June 2017

BackgroundData on temporal trends of heart failure (HF) in acute coronary syndrome (ACS) are scarce.HypothesisImproved treatment options may have led to lower case‐fatality rates (CFRs) during the last years in ACS complicated by HF.MethodsPatients of the nationwide Acute Myocardial Infarction in Switzerland (AMIS)–Plus ACS registry were analyzed from 2000 to 2014.ResultsOf 36 366 ACS patients, 3376 (9.3%) had acute or chronic HF, 2111 (5.8%) de novo acute HF (AHF), 964 (2.7%) chronic HF (CHF), and 301 (0.8%) acute decompensated CHF (ADCHF). In‐hospital CFRs were highest in patients with ADCHF (32.6%) and de novo AHF (29.7%), followed by patients with CHF (12.9%) and without HF (3.2%, P < 0.001). Although in‐hospital CFRs gradually decreased in CHF patients (14.3% to 4.5%, P = 0.003) and patients without HF (3.5% to 2.2%, P < 0.001), they remained high in patients with ADCHF (36.4% to 40.0%, P = 0.45) and de novo AHF (50.0% to 29.4%, P = 0.37). Although there was an increase in specific ACS therapies in the cohort over time, ACS patients with HF received significantly less pharmacological and interventional ACS therapies than patients without HF. There was no significant change in HF medication rates except less frequent use of β‐blockers and diuretics in de novo AHF patients in recent years.Conclusions
HF is present in 1 out of 10 patients presenting with ACS and is associated with high in‐hospital CFRs, particularly in acute HF. Although advances in ACS therapy improved in‐hospital CFRs in patients with no HF or CHF, CFRs remained unchanged and high in patients with acute HF and ACS over the last decade.
Synthesis and Biological Evaluation of Glycyrrhetic Acid Derivatives as Potential VEGFR2 Inhibitors
Authors: Yan Tian‐Long , Bai Li‐Fei , Zhu Hai‐Liang , Zhang Wei‐Ming , Lv Peng‐Cheng 
Published: June 2017

AbstractVascular endothelial growth factor receptor 2 (VEGFR2) has been proven to play a major role in the regulation of tumor angiogenesis. A series of novel glycyrrhetic acid derivatives were synthesized and evaluated for their VEGFR2 inhibitory activity as well as their antiproliferative properties against four cancer cell lines (MCF‐7, HeLa, HepG2, and A549). In vitro biological evaluations against these human tumor cell lines indicate that most of the prepared compounds have antiproliferative activities; compound 3 a (3β‐hydroxy‐30‐(4‐phenyl‐1‐piperazinyl)olean‐12‐ene‐11,30‐dione) exhibited the best inhibitory activity against MCF‐7 cells, with an IC50 value of 1.08 μm. Compound 3 a also showed the most potent inhibitory activity against VEGFR2 tyrosine kinase, with an IC50 value of 0.35 μm. Docking simulations were performed with the aim of discovering the binding mode of compound 3 a, and the results indicate that 3 a could bind at the VEGFR2 active site.
Searching for Novel Inhibitors of the S. aureus NorA Efflux Pump: Synthesis and Biological Evaluation of the 3‐Phenyl‐1,4‐benzothiazine Analogues
Authors: Felicetti Tommaso , Cannalire Rolando , Burali Maria Sole , Massari Serena , Manfroni Giuseppe , Barreca Maria Letizia , Tabarrini Oriana , Schindler Bryan D. , Sabatini Stefano , Kaatz Glenn W. , Cecchetti Violetta 
Published: June 2017

AbstractBacterial resistance to antimicrobial agents has become an increasingly serious health problem in recent years. Among the strategies by which resistance can be achieved, overexpression of efflux pumps such as NorA of Staphylococcus aureus leads to a sub‐lethal concentration of the antibacterial agent at the active site that in turn may predispose the organism to the development of high‐level target‐based resistance. With an aim to improve both the chemical stability and potency of our previously reported 3‐phenyl‐1,4‐benzothiazine NorA inhibitors, we replaced the benzothiazine core with different nuclei. None of the new synthesized compounds showed any appreciable intrinsic antibacterial activity, and, in particular, 2‐(3,4‐dimethoxyphenyl)quinoline (6 c) was able to decrease, in a concentration‐dependent manner, the ciprofloxacin MIC against the norA‐overexpressing strains S. aureus SA‐K2378 (norA++) and SA‐1199B (norA+/A116E GrlA).
Synthesis and Antibacterial Activity of Polymerizable Acryloyloxyalkyltriethyl Ammonium Salts
Authors: Mancuso Raffaella , Amuso Roberta , Armentano Biagio , Grasso Giuseppe , Rago Vittoria , Cappello Anna Rita , Galiano Francesco , Figoli Alberto , De Luca Giorgio , Hoinkis Jan , Gabriele Bartolo 
Published: June 2017

AbstractThis study reports an efficient and practical synthetic approach for the synthesis of a particularly important class of polymerizable quaternary ammonium salts (PQASs), that is, acryloxyalkyltriethylammonium bromides (AATEABs), which may find application as antimicrobial coatings for commercial membranes with antifouling and anti‐biofouling properties, to be used for wastewater treatment. The synthetic method is based on a simple two‐step procedure from commercially available substrates, entirely carried out under air and without any need for chromatographic purification. All the newly synthesized AATEABs were tested for their antimicrobial activity, and the results showed that AATEABs bearing an alkyl chain of 11 and particularly 12 carbon atoms possessed significant activity against Gram positive bacteria and yeast strains.
Preoperative evaluation of bone quality for dental implantation using an ultrasound axial transmission device in an ex vivo model
Authors: Okada Shinsuke , Kawano Akira , Oue Hiroshi , Takeda Yosuke , Yokoi Miyuki , Koretake Katsunori , Tsuga Kazuhiro 
Published: June 2017

AbstractThis study investigated the clinical utility of an ultrasound axial transmission device in preoperative evaluation of bone quality for dental implantation, by clarifying the relationship between cortical bone speed of sound (cSOS), insertion torque values (ITV), and implant stability quotient (ISQ) in porcine femur bone. Eleven fresh porcine femurs, without soft tissue, were prepared. The cSOS of these bones were measured using the axial transmission device. Bone mineral density (BMD) and porosity (Po) were measured in cortical bone samples obtained from the region of ultrasound measurements by X‐ray microcomputed tomography. Thirty‐three implants were inserted into these samples (three implants per bone sample), and ITV and ISQ were measured for all implants. Then, cortical bone thickness (CbTh) of the area for implantation was measured for all implants using a micrometer. The mean cSOS was 3962 m/s; mean BMD and Po were 0.822 g/cm2 and 0.185%, respectively. cSOS and BMD values were positively correlated, and cSOS values and Po values were negatively correlated. Mean ITV, ISQ, and CbTh were 37.95 Ncm, 71.172, and 2.869 mm, respectively. There was a positive correlation between cSOS values and ISQ values. The cSOS of each bone did not correlate with ITV for all of the bone samples. However, when the CbTh ranges from 3.0 to 3.5 mm, ITV are correlated with cSOS. These findings suggest that cSOS, which reflects the cortical bone quality, may be clinical utility as a preoperative diagnosis of the implant.