bluuebunny/crossref_metadata_2025_split huggingface dataset:
Raumakustische Zielgrößen und Maßnahmen zur Optimierung der kognitiven Leistungsfähigkeit sowie des akustischen Komforts in Mehrpersonenbüros
Authors: Liebl Andreas , Drotleff Horst , Sedlbauer Klaus , Schleuniger Felix , Uygun Abidin 
Published: April 2011

AbstractLärm zählt zu den häufigsten Quellen von Beschwerden an Büroarbeitsplätzen. Insbesondere Gespräche von Mitarbeitern werden als störend erlebt. Darüber hinaus beeinträchtigt Bürolärm die Leistungsfähigkeit und das Befinden der Angestellten. Richtlinien und Normen berücksichtigen kaum die besondere Bedeutung sprachlicher Hintergrundgeräusche. Der Speech Transmission Index (STI), ein Maß für die Verständlichkeit von Sprache, wird aktuell als geeignete physikalische Führungsgröße zur Gestaltung offener Büroumgebungen diskutiert. Im Rahmen einer laborexperimentellen Untersuchung wird der Zusammenhang zwischen der Darbietung von Hintergrundschallen mit unterschied licher Sprachverständlichkeit (STI) und der kognitiven Leistungsfähigkeit sowie dem empfundenen akustischen Komfort von Probanden untersucht. Dabei zeigt sich ein starker Zusammenhang zwischen der Sprachverständlichkeit und Maßen kognitiver Leistungsfähigkeit sowie akustischem Komfort. Der STI kann daher als eine geeignete physikalische Führungsgröße zur Gestaltung offener Büroumgebungen betrachtet werden.Room acoustical set values and measures for optimization of cognitive performance and acoustic comfort in open‐plan offices. Noise is among the most frequently mentioned sources of complaint in open‐plan offices. Particularly conversations of colleagues are perceived as being annoying. In addition office noise is known to impair employees’ cognitive performance and wellbeing. Standards and norms hardly account for the special role of background speech. The Speech Transmission Index (STI), a measure of speech intelligibility, is assumed to be a suitable physical set value for the acoustical design of open‐plan offices. The results of a laboratory experiment are presented investigating the relationship between presentation of background speech varying in STI and cognitive performance as well as perceived acoustic comfort. A strong relationship between speech intelligibility and cognitive performance as well as acoustic comfort is found. Therefore the STI can be assumed to be a suitable physical set value for the acoustic design of open‐plan office.
Evaluierung und Optimierung einer doppelschaligen Fassade mit Hilfe von Simulationen
Authors: Reith András , Gelesz Adrienn , Pültz Gunter 
Published: April 2011

AbstractBei großflächig verglasten, mehrgeschossigen Bürogebäuden liegen doppelschalige, hinterlüftete Glasfassaden nach wie vor im gestalterischen Trend. Die Konstruktionsdetails der Fassade haben einen erheblichen Einfluss auf die sommerliche Überhitzung der Luft im Fassadenzwischenraum (FZR), in dem auch der Sonnenschutz platziert ist. Es empfiehlt sich daher, die Details einer doppelschaligen Fassade im Hinblick auf die sommerlichen Temperaturverhältnisse zu optimieren. Die üblichen Methoden einer standardmäßigen bauphysikalischen Planung sind für eine derartige Optimierung nur sehr bedingt verwendbar. Im vorliegenden Beitrag wird anhand des Projektes Neues K & H Bank‐Gebäude in Budapest exemplarisch aufgezeigt, wie mit Hilfe von moderner Simulationstechnik die Ausbildung einer doppelschaligen Fassade evaluiert und anschließend optimiert werden kann.Evaluation and optimization of a double skin façade with the help of computational simulations. Natural ventilated double skin façades still prove to be trendy design choices for multi‐story office buildings with large glazed surfaces. The construction design details of these façades have a significant impact on the summer overheating of the air in the façade cavity, in which the shading is positioned also. Therefore it is recommended to investigate and optimize the parameters of the double skin façade concerning the summer temperature conditions. The usual methods of standard building physical planning have limited application possibilities for optimizing these kinds of systems. Therefore in the following article through the example of the K°&°H Bank, Budapest, we are going to explain how the modern simulation techniques can support the constructional design of double skin façades first by evaluation, then subsequently, by optimization.
Parallel production and verification of protein products using a novel high‐throughput screening method
Authors: Tegel Hanna , Yderland Louise , Boström Tove , Eriksson Cecilia , Ukkonen Kaisa , Vasala Antti , Neubauer Peter , Ottosson Jenny , Hober Sophia 
Published: April 2011

AbstractProtein production and analysis in a parallel fashion is today applied in laboratories worldwide and there is a great need to improve the techniques and systems used for this purpose. In order to save time and money, a fast and reliable screening method for analysis of protein production and also verification of the protein product is desired. Here, a micro‐scale protocol for the parallel production and screening of 96 proteins in plate format is described. Protein capture was achieved using immobilized metal affinity chromatography and the product was verified using matrix‐assisted laser desorption ionization time‐of‐flight MS. In order to obtain sufficiently high cell densities and product yield in the small‐volume cultivations, the EnBase® cultivation technology was applied, which enables cultivation in as small volumes as 150 μL. Here, the efficiency of the method is demonstrated by producing 96 human, recombinant proteins, both in micro‐scale and using a standard full‐scale protocol and comparing the results in regard to both protein identity and sample purity. The results obtained are highly comparable to those acquired through employing standard full‐scale purification protocols, thus validating this method as a successful initial screening step before protein production at a larger scale.
Docking on the DNA G‐quadruplex: A molecular electrostatic potential study
Authors: Mondragón‐Sánchez Juan Antonio , Santamaria Ruben , Garduño‐Juárez Ramón 
Published: April 2011

AbstractThe G‐quadruplexes are four‐stranded nucleic acid structures with guanine‐rich sequences that play important biological roles in, for example, regulating telomerase association and activity. Recent evidence supports the hypothesis that the telomeric G‐quadruplex DNA represents a target of novel anticancer drug medication. In this work, we present results of the molecular electrostatic potential (MEP), together with the HOMO and LUMO frontier orbitals, which are physical quantities of concern in the docking of compounds on the G‐quadruplex. The calculations are performed in the frame of density functional theory at the B88LYP/6‐31G* level of theory. Additional functionals that introduce dispersion effects were also taken into consideration. The MEP potential and electron density of the frontier molecular orbitals of the G‐quadruplex exhibit topological deformations due to the coiled conformation of the compound when they are compared with the MEP and corresponding electron density of a DNA duplex with similar nucleic acid composition. The electrostatic active zone of the G‐quadruplex is localized on the top part of the quadruplex structure where the MEP acquires the most negative values. Additional computations on a set of three daunomycins, a common anticancer drug for duplex DNA, indicate an electrostatic fastening between the quadruplex and the set of daunomycins. In this regard, the G‐quadruplex electrostatic interactions favor the stacking of ligands. Finally, some implications on molecular drug design are briefly discussed. © 2011 Wiley Periodicals, Inc. Biopolymers 95: 641–650, 2011.
Feature‐based vector simulation of water waves
Authors: Yu Qizhi , Neyret Fabrice , Steed Anthony 
Published: April 2011

AbstractWe present a method for simulating local water waves caused by obstacles in water streams for real‐time graphics applications. Given a low‐resolution water surface and velocity field, our method is able to decorate the input water surface with high resolution detail for the animated waves around obstacles. We construct and animate a vector representation of the waves. It is then converted to feature‐aligned meshes for capturing the surfaces of the waves. Results demonstrate that our method has the benefits of real‐time performance and easy controllability. The method also fits well into a state‐of‐the‐art river animation system. Copyright © 2011 John Wiley & Sons, Ltd.
Efficient wavelet‐based geometry compression
Authors: Zhao Chong , Sun Hanqiu , Qin Kaihuai 
Published: April 2011

AbstractIn recent years, some wavelets constructed via local lifting have been proposed to accelerate the compression of geometric models. Unlike the traditional wavelet‐based compression with global optimisation, their compression ratios are still not sufficient, particularly at low‐bit rates. In this paper, we present a novel efficient wavelet‐based compression approach using the matrix‐valued Loop subdivision on triangular meshes. Based on the local lifting scheme, the computation of the wavelet transform is highly efficient and requires low memory usage. With the shape controls introduced by the matrix‐valued subdivision, our approach can greatly improve the fitting quality of surfaces while keeping the efficient data compression. The experimental results showed that our wavelet transform had better performance on balancing the efficiency and compression ratios. Copyright © 2011 John Wiley & Sons, Ltd.
Strategies and Perspectives in Ion‐Channel Engineering
Authors: Grosse Wolfgang , Essen Lars‐Oliver , Koert Ulrich 
Published: April 2011

AbstractMembranes form natural barriers that need to be permeable to diverse matter like ions and substrates. This permeability is controlled by ion‐channel proteins, which have attracted great interest for pharmaceutical applications. Ion‐channel engineering (ICE) modifies biological ion channels by chemical/biological synthetis means. The goal is to obtain ion channels with modified or novel functionality. Three functional strategies exist. The first is the manipulation of the wider pores with robust β‐barrel structures, such as those of α‐hemolysin and porins. The second engineering approach focuses on the modification of narrow (mostly α‐helical) pores to understand selectivity and modes of action. A third functional approach addresses channel gating by (photo)triggering the biological receptor that controls the channel. Several synthetis strategies have been developed and successfully utilized for the synthetic modification of biological ion‐channels: the S‐alkylation of specifically introduced Cys, protein semisynthesis by native chemical ligation, protein semisynthesis by protein trans‐splicing, as well as nonsense‐suppression methods. Structural studies (X‐ray crystallography, NMR spectroscopy) are necessary to support the functional studies and to afford predictable engineering. The reprogramming and re‐engineering of channels can be used for sensing applications, treatment of channelopathies, chemical neurobiology, and providing novel lead compounds for targeting ion channels.
Low‐Valent Molybdenum‐Based Dual Pre‐Catalysts for Highly Efficient Catalytic Epoxidation of Alkenes and Deoxygenation of Sulfoxides
Authors: Krackl Sebastian , Company Anna , Enthaler Stephan , Driess Matthias 
Published: April 2011

AbstractA variety of homoleptic and heteroleptic, triply bonded dimolybdenum hexaalkoxides, [(Mo2(OR)6] and [Mo2(OR)4(OR′)2], were successfully applied as dual pre‐catalysts in both, the epoxidation of olefins with tert‐butyl hydroperoxide and the deoxygenation of diorganosulfoxides with silanes, to form the corresponding sulfides. In the epoxidation of cyclooctene, the pre‐catalysts demonstrated an intriguingly high activity, with turnover frequencies (TOFs) of above 60 000 h−1 at elevated temperatures (≈50 °C) and even very high activity at room temperature. Furthermore, using [Mo2(OtBu)6] as a pre‐catalyst, we studied the effect of the solvent and we extended the epoxidation reaction to more demanding olefins, which revealed a particularly high activity even towards primary alkenes. In addition, the same pre‐catalysts, in comparison to previously reported Mo‐based systems, exhibited excellent activities for the deoxygenation of phenyl methyl sulfoxide to thioanisole in the presence of silanes (TOFs>160 h−1). A number of other diorganosulfoxides were used in the catalytic deoxygenation to investigate the scope and limitations of the system, displaying an excellent performance for differently substituted substrates.
Aging and Thermal Stability of the Mixed Product of the Ether‐Soluble Fraction of Bio‐Oil and Bio‐Diesel
Authors: Jiang X. , Zhong Z. , Ellis N. , Wang Q. 
Published: April 2011

AbstractThe storage and thermal stability of blends of the ether‐soluble fraction of bio‐oil (ES) and bio‐diesel are reported. Fuel properties such as viscosity, water content, acid number and average molecular weight of the ES/bio‐diesel blends were measured before and after aging. Compared to the aging properties of bio‐oil alone, very small changes in water content and viscosity were shown for the blends aged at 80 °C for 180 h. Chemical changes were characterized using gel permeation chromatography, showing a slight increase in the molecular weight over time. Further confirmation of the changes was provided through Fourier transform infrared spectrometry, thermal decomposition analysis using a thermogravimetric analyzer, proton assignment using proton nuclear magnetic resonance, and carbon assignment using carbon nuclear magnetic resonance. Overall, the study indicates that ES/bio‐diesel blends are stable as fuel under the conditions tested in this paper.
Oxidation of Phenol by Microbubble‐Assisted Microelectrolysis
Authors: Ren Y. , Wu Z. , Ondruschka B. , Braeutigam P. , Franke M. , Nehring H. , Hampel U. 
Published: April 2011

AbstractThe degradation of phenol under microelectrolysis was enhanced by O2‐microbubbles. Phenol solution was circled in a microbubble‐assisted microelectrolysis reactor under acid conditions. The degradation rate of phenol reached 65 % within 2 h with O2‐microbubbles, compared to 9.5 % and 4 % with air‐ and N2‐microbubbles due to better dissolution of oxygen with finer microbubbles and at higher dissolution pressure. Higher efficiencies of phenol degradation at lower temperature further confirm the role of dissolved oxygen. In the microbubble‐assisted microelectrolysis system dissolved oxygen, carbon steel pellets, and sulfuric acid are necessary conditions for the oxidation of phenol. The conversion of phenol increases with an increasing amount of carbon steel pellets and/or sulfuric acid. Catechol, hydroquinone, and low‐molecular‐weight carboxylic acids are the major products.
Aggregation and Layering Transitions in Thin Films of X‐, T‐, and Anchor‐Shaped Bolaamphiphiles at the Air–Water Interface
Authors: Nitoń Patrycja , Żywociński Andrzej , Paczesny Jan , Fiałkowski Marcin , Hołyst Robert , Glettner Benjamin , Kieffer Robert , Tschierske Carsten , Pociecha Damian , Górecka Ewa 
Published: April 2011

AbstractAggregation in Langmuir films is usually understood as being a disorderly grouping of molecules turning into chaotic three‐dimensional aggregates and is considered an unwanted phenomenon causing irreversible changes. In this work we present the studies of 11 compounds from the group of specific surfactants, known as bolaamphiphiles, that exhibit reversible aggregation and, in many cases, transition to well‐defined multilayers, which can be considered as a layering transition. These bolaamphiphiles incorporate rigid π‐conjugated aromatics as hydrophobic cores, glycerol‐based polar groups and hydrophobic lateral chains. Molecules of different shapes (X‐, T‐, and anchor) were studied and compared. The key property of these compounds is the partial fluorination of the lateral chains linked to the rigid cores of the molecules. The most interesting feature of the compounds is that, depending on their shape and degree of fluorination, they are able to resist aggregation and preserve a monolayer structure up to relatively high surface pressures (T‐shaped and some X‐shaped molecules), or create well‐defined trilayers (X‐ and anchor‐shaped molecules). Experimental studies were performed using Langmuir balance, surface potential and X‐ray reflectivity measurements.
Application of L‐proline derivatives as chiral shift reagents for enantiomeric recognition of carboxylic acids
Authors: Naziroglu Hayriye Nevin , Durmaz Mustafa , Bozkurt Selahattin , Sirit Abdulkadir 
Published: April 2011

AbstractFour proline‐derived chiral receptors 5, 6, 7, 8 were readily synthesized starting from L‐proline. The enantiomeric recognition ability of chiral receptors was examined with a series of carboxylic acids by 1H NMR spectroscopy. The molar ratio and the association constants of the chiral compounds with each of the enantiomers of guest molecules were determined by using Job plots and a nonlinear least‐squares fitting method, respectively. The Job plots indicate that the hosts form 1:1 instantaneous complexes with all guests. The receptors exhibited different chiral recognition abilities toward the enantiomers of racemic guests. Among the chiral receptors used in this study, prolinamide 6 was found to be the best chiral shift reagent and is effective for the determination of the enantiomeric excess of chiral carboxylic acids. Chirality, 2011. © 2011 Wiley‐Liss, Inc.
Magnetic and Luminescent Properties of Sm, Eu, Tb, and Dy Coordination Polymers with 2‐Hydroxynicotinic Acid
Authors: Xu Na , Wang Chao , Shi Wei , Yan Shi‐Ping , Cheng Peng , Liao Dai‐Zheng 
Published: April 2011

AbstractBy using multidentate ligand 2‐hydroxynicotinic acid (H2nica), six new lanthanide coordination polymers [Sm(Hnica)(H2O)2SO4]n (1), {[Sm3(Hnica)6(H2O)6(OH)]·3H2O·SO4}n (2), [Eu(Hnica)(H2O)2SO4]n (3), {[Eu3(Hnica)6(H2O)6(OH)]·6H2O·SO4}n (4), {[Tb(Hnica)2(H2O)2]ClO4·H2O}n (5), and {[Dy(Hnica)2(H2O)2]ClO4·H2O}n (6) were synthesized and characterized by elemental analysis, IR spectra, and X‐ray single‐crystal diffraction. Compounds 1 and 3 exhibit a 1D Ln–O–Ln chain structure. Compounds 2 and 4 show a 2D Kagomé lattice structure, whereas 5 and 6 display a 2D rhombic grid structure. The luminescent properties of 1–6 at room temperature were studied. Direct‐current (dc) magnetic susceptibility studies reveal antiferromagnetic interactions between LnIII ions in 1–6, and alternating‐current (ac) magnetic susceptibility data of 6 suggests frequency‐dependent out‐of‐phase signals below 5 K.
Enantioselective Access to Key Intermediates for Salvinorin A and Analogues
Authors: Lanfranchi Don Antoine , Bour Christophe , Hanquet Gilles 
Published: April 2011

AbstractAccess to enantiopure synthetic platforms that can generate key intermediates for salvinorin A analogues through diastereoselective Diels–Alder cycloaddition between an enantiopure sulfinylquinone and semicyclic dienes is described.
Pharmacologic downregulation of c‐FLIPL restores juxtacrine death receptor‐mediated apoptosis in cancer cells in a peritoneal carcinomatosis model
Authors: Shen Yi , Herde Ryan , Doxey Brett W. , Xu Changxin , Gray Phillip D. , Kuwada Scott K. 
Published: April 2011

AbstractMetastasis occurs when circulating cancer cells implant in normal secondary tissues. Paradoxically, many cancer cells express death receptors while many normal tissues express the cognate death receptor ligands, suggesting that cancer cells possess mechanisms to inhibit death receptor signaling. Pharmacological restoration of juxtacrine‐mediated death receptor signaling could prevent cancer cells from implanting in normal tissues such as the peritoneum. The results showed that BAY 11‐7085 significantly inhibited peritoneal carcinomatosis in mice following the introduction of colon and pancreatic cancer cell lines into the intra‐abdominal cavity. Treatment with BAY 11‐7085 restored juxtacrine death receptor signaling during the adhesion of the cancer cells to mesothelial cells, which line the peritoneum. BAY 11‐7085 rapidly inhibited c‐FLIPL expression in colon and pancreatic cancer cell lines during adhesion to mesothelial cells. Pancreatic cancer cells sorted for high c‐FLIPL expression formed peritoneal implants much more readily than cells with low c‐FLIPL expression, and RNAi inhibition of c‐FLIPL in colon cancer cells dramatically reduced peritoneal implantation. This is a novel demonstration that the restoration of death receptor‐mediated apoptotic signaling in cancer cells through the pharmacological inhibition of c‐FLIPL can inhibit tumor implantation in a clinically relevant model of peritoneal carcinomatosis, a fatal disease. Pharmacological inhibitors of FLIP hold promise as a way to curtail cancer cell colonization of secondary tissues.
Inhibition of CXCR4/CXCL12 signaling axis by ursolic acid leads to suppression of metastasis in transgenic adenocarcinoma of mouse prostate model
Authors: Shanmugam Muthu K. , Manu Kanjoormana A. , Ong Tina H. , Ramachandran Lalitha , Surana Rohit , Bist Pradeep , Lim Lina H.K , Prem Kumar Alan , Hui Kam M. , Sethi Gautam 
Published: April 2011

AbstractIncreasing evidences indicate that CXCR4/CXCL12 signaling pathway plays a pivotal role in the process of distant site metastasis that accounts for more than 90% of prostate cancer related deaths in patients. Thus, novel drugs that can downregulate CXCR4/CXCL12 axis have a great potential in the treatment of metastatic prostate cancer. In this report, we tested an agent, ursolic acid (UA) for its ability to modulate CXCR4 expression in prostate cancer cell lines and inhibit metastasis in vivo in transgenic adenocarcinoma of mouse prostate (TRAMP) model. We observed that UA downregulated the expression of CXCR4 in prostate cancer cells irrespective of their HER2 status in a dose‐ and time‐dependent manner. Neither proteasome inhibitor nor lysosomal stabilization had any effect on UA‐induced decrease in CXCR4 expression. When investigated for the molecular mechanisms, it was observed that the downregulation of CXCR4 was due to transcriptional regulation as indicated by downregulation of mRNA expression, inhibition of NF‐κB activation and modulation of chromatin immunoprecipitation activity. Suppression of CXCR4 expression by UA further correlated with the inhibition of CXCL12‐induced migration and invasion in prostate cancer cells. Finally, we also found that UA treatment can inhibit metastasis of prostate cancer to distal organs, including lung and liver and suppress CXCR4 expression levels in the prostate tissues of TRAMP mice. Overall, our experimental findings suggest that UA exerts its antimetastatic effects through the suppression of CXCR4 expression in prostate cancer both in vitro and in vivo.