bluuebunny/crossref_metadata_2025_split huggingface dataset:
Starch phosphorylation—Maltosidic restrains upon 3′‐ and 6′‐phosphorylation investigated by chemical synthesis, molecular dynamics and NMR spectroscopy
Authors: Hansen Peter I. , Spraul Manfred , Dvortsak Peter , Larsen Flemming H. , Blennow Andreas , Motawia Mohammed S. , Engelsen Søren B. 
Published: November 2008

AbstractPhosphorylation is the only known in vivo substitution of starch, yet no structural evidence has been provided to explain its implications of the amylosidic backbone and its stimulating effects on starch degradation in plants. In this study, we provide evidence for a major influence on the glucosidic bond in starch specifically induced by the 3‐O‐phosphate. Two phosphorylated maltose model compounds were synthesized and subjected to combined molecular dynamics (MD) studies and 950 MHz NMR studies. The two phosphorylated disaccharides represent the two possible phosphorylation sites observed in natural starches, namely maltose phosphorylated at the 3′‐ and 6′‐position (maltose‐3′‐O‐phosphate and maltose‐6′‐O‐phosphate). When compared with maltose, both of the maltose‐phosphates exhibit a restricted conformational space of the α(1→4) glycosidic linkage. When maltose is phosphorylated in the 3′‐position, MD and NMR show that the glucosidic space is seriously restricted to one narrow potential energy well which is strongly offset from the global potential energy well of maltose and almost 50°degrees from the Φ angle of the α‐maltose crystal structure. The driving force is primarily steric, but the configuration of the structural waters is also significantly altered. Both the favored conformation of the maltose‐3′‐phosphate and the maltose‐6′‐phosphate align well into the 6‐fold double helical structure of amylopectin when the effects on the glucosidic bond are not taken into account. However, the restrained geometry of the glucosidic linkage of maltose‐3′‐phosphate cannot be accommodated in the helical structure, suggesting a major local disturbing effect, if present in the starch granule semi‐crystalline lattice. © 2008 Wiley Periodicals, Inc. Biopolymers 91: 179–193, 2009.This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com
Biochemical and biophysical characterization of a novel plant protein disulfide isomerase
Authors: Gruber Christian W. , Čemažar Maša , Mechler Adam , Martin Lisandra L. , Craik David J. 
Published: November 2008

AbstractWe recently isolated a protein disulfide isomerase (PDI) from the Rubiaceae (coffee family) plant Oldenlandia affinis (OaPDI) and demonstrated that it facilitates the production of disulfide‐knotted defense proteins called cyclotides. PDIs are major folding catalysts in the eukaryotic ER where they are responsible for formation, breakage, or shuffling of disulfide bonds in substrate polypeptides and are important chaperones in the secretory pathway. Here, we report the first detailed analysis of the oligomerization behavior of a plant PDI, based on characterization of OaPDI using various biochemical and biophysical techniques, including size‐exclusion chromatography, NMR spectroscopy, surface plasmon resonance and atomic force microscopy. In solution at low concentration OaPDI comprises mainly monomers, but fractions of dimers and/or higher‐order oligomers were observed at increased conditions, raising the possibility that dimerization and/or oligomerization could be a mechanism to adapt to the various‐sized polypeptide substrates of PDI. Unlike mammalian PDIs, oligomerization of the plant PDI is not driven by the formation of intermolecular disulfide bonds, but by noncovalent interactions. The information derived in this study advances our understanding of the oligomerization behavior of OaPDI in particular but is potentially of broader interest for understanding the mechanism and role of oligomerization, and hence the catalytic and physiological mechanism, of the ubiquitous folding catalyst PDI. © 2008 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 92: 35–43, 2009.This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com
Liquid–liquid extraction of fermentation inhibiting compounds in lignocellulose hydrolysate
Authors: Zautsen R.R.M. , Maugeri‐Filho F. , Vaz‐Rossell C.E. , Straathof A.J.J. , van der Wielen L.A.M. , de Bont J.A.M. 
Published: November 2008

AbstractSeveral compounds that are formed or released during hydrolysis of lignocellulosic biomass inhibit the fermentation of the hydrolysate. The use of a liquid extractive agent is suggested as a method for removal of these fermentation inhibitors. The method can be applied before or during the fermentation. For a series of alkanes and alcohols, partition coefficients were measured at low concentrations of the inhibiting compounds furfural, hydroxymethyl furfural, vanillin, syringaldehyde, coniferyl aldehyde, acetic acid, as well as for ethanol as the fermentation product. Carbon dioxide production was measured during fermentation in the presence of each organic solvent to indicate its biocompatibility. The feasibility of extractive fermentation of hydrolysate was investigated by ethanolic glucose fermentation in synthetic medium containing several concentrations of furfural and vanillin and in the presence of decanol, oleyl alcohol and oleic acid. Volumetric ethanol productivity with 6 g/L vanillin in the medium increased twofold with 30% volume oleyl alcohol. Decanol showed interesting extractive properties for most fermentation inhibiting compounds, but it is not suitable for in situ application due to its poor biocompatibility. Biotechnol. Bioeng. 2009;102: 1354–1360. © 2008 Wiley Periodicals, Inc.
Functional characterization of a bacterial expansin from Bacillus subtilis for enhanced enzymatic hydrolysis of cellulose
Authors: Kim Eun Sil , Lee Hee Jin , Bang Won‐Gi , Choi In‐Geol , Kim Kyoung Heon 
Published: November 2008

AbstractExpansin is a plant protein family that induces plant cell wall‐loosening and cellulose disruption without exerting cellulose‐hydrolytic activity. Expansin‐like proteins have also been found in other eukaryotes such as nematodes and fungi. While searching for an expansin produced by bacteria, we found that the BsEXLX1 protein from Bacillus subtilis had a structure that was similar to that of a β‐expansin produced by maize. Therefore, we cloned the BsEXLX1 gene and expressed it in Escherichia coli to evaluate its function. When incubated with filter paper as a cellulose substrate, the recombinant protein exhibited both cellulose‐binding and cellulose‐weakening activities, which are known functions of plant expansins. In addition, evaluation of the enzymatic hydrolysis of filter paper revealed that the recombinant protein also displayed a significant synergism when mixed with cellulase. By comparing the activity of a mixture of cellulase and the bacterial expansin to the additive activity of the individual proteins, the synergistic activity was found to be as high as 240% when filter paper was incubated with cellulase and BsEXLX1, which was 5.7‐fold greater than the activity of cellulase alone. However, this synergistic effect was observed when only a low dosage of cellulase was used. This is the first study to characterize the function of an expansin produced by a non‐eukaryotic source. Biotechnol. Bioeng. 2009;102: 1342–1353. © 2008 Wiley Periodicals, Inc.
Sensitivity Study on Modeling an Internal Airlift Loop Reactor Using a Steady 2D Two‐Fluid Model
Authors: Huang Q. , Yang C. , Yu G. , Mao Z.‐S. 
Published: November 2008

AbstractThe sensitivity study of bubbly flow in an internal airlift loop reactor is presented using a steady Reynolds averaging two‐fluid model. Comparative evaluation of different drag formulations, drag coefficient correlations, turbulence effect on the drag coefficient, outlet slip velocity, and bubble size is performed and the respective influence to the simulation results is highlighted. It is found that a complicated drag formulation may not result in reliable predictions. All the drag coefficient correlations underpredict the gas holdup if the influence of turbulence on the drag coefficient is not well incorporated. Fortunately, the global hydrodynamics is not sensitive to the outflow slip velocity for a wide range, so a steady two‐fluid model can be used to simulate the bubbly flow when the flow field is fully developed. The correct estimation of bubble size with properly selected correlations play an important role in successful simulation of gas‐liquid bubbly flow in airlift loop reactors.
Predicting Water‐Hydrocarbon Systems Mutual Solubility
Authors: Bahadori A. , Vuthaluru H. B. , Tadé M. O. , Mokhatab S. 
Published: November 2008

AbstractDescribing the mutual solubilities of hydrocarbons and water is very important in the energy industry. The presence of water in a hydrocarbon mixture can affect the product quality and damage the operation equipment due to corrosion and formation of gas hydrates. Tracing the concentration of hydrocarbons in aqueous media is also important for technical purposes like preventing oil spills and for ecological concerns such as predicting the fate of these organic pollutants in the environment. Over the past three decades, a number of difficult thermodynamic approaches to the description of the mutual solubilities of hydrocarbons and water have been attempted. However, there was no easy‐to‐use model available for a qualitative description of the mutual solubility of water and hydrocarbons for a broad range of systems, over a wide range of thermodynamic conditions. This paper presents an easy‐to‐use correlation for an excellent prediction of the mutual solubility of water‐hydrocarbon systems in a broad range of temperatures between 0 and 120 °C, and heavy hydrocarbons between C3 and C10. The average absolute deviation from available data is 3 %.
Optimization of Methanol Synthesis Loops with Quench Reactors
Authors: Santangelo D. L. O. , Ahón V. R. R. , Costa A. L. H. 
Published: November 2008

AbstractAn optimization procedure for increasing the methanol production in synthesis loops with quench reactors is presented. The process decision variables are represented by a set of split fractions of the reactor feed to the catalyst beds. The optimization routine is coupled to a steady‐state model of the methanol synthesis loop. Numerical results illustrate the performance of the proposed optimization procedure, presenting an example, where a considerable increase in methanol production can be reached after the application of the optimization procedure.
Particle Size Control of Nanocrystalline Anatase TiO2 Synthesized by Hydrolysis of Titanyl Organic Compounds
Authors: Chen X.‐Q. , Shen W.‐H. , Liu H.‐B. 
Published: November 2008

AbstractThe global nanocrystalline anatase TiO2 particle can be obtained by hydrolysis of titanyl organic compounds. Its particle size is mostly influenced by the titanyl organic compounds' concentration, nitric acid (HNO3) concentration, reaction time and temperature, and especially the HNO3 concentration. The formation of nanocrystalline TiO2 with bigger size can be accelerated by a higher temperature, thick solution of reactant (titanyl organic compounds), and HNO3. Vice versa, in order to gain smaller particles, such as 6 nm, the reaction conditions should be set at a thin reactant solution, low temperature, and low HNO3 concentration. The reason lies in the hydrolyzing mechanism of titanyl organic compounds, which is strongly influenced by the temperature and pH.
New Turbine Impellers for Viscous Mixing
Authors: Cabaret F. , Fradette L. , Tanguy P. A. 
Published: November 2008

AbstractNew open impellers developed for viscous mixing applications were characterized experimentally in terms of power consumption and mixing times, and their performance was compared to that of standard turbines. Their design is based on a nonsymmetry of revolution principle contrary to standard impellers. A color‐discoloration technique based on a fast acid‐base indicator reaction and image analysis were used to evaluate the mixing efficiency. Experimental results show that the segregated, torus‐shaped regions, always observed above and below standard turbine impellers, can be significantly reduced using the new turbine designs generating a well‐balanced axial‐radial flow field.
High Throughput Screening for the Design and Optimization of Chromatographic Processes: Assessment of Model Parameter Determination from High Throughput Compatible Data
Authors: Susanto A. , Knieps‐Grünhagen E. , von Lieres E. , Hubbuch J. 
Published: November 2008

AbstractChromatographic processes can be optimized in various ways, and the two most prominent approaches are based either on statistical data analysis or on experimentally validated simulation models. Both strategies rely heavily on experimental data, the generation of which usually imposes a significant bottleneck on rational process design. The latter approach is followed in this work, and the utilizability of high throughput compatible experiments for the determination of model parameters which are required for in silico process optimization, is assessed. The unknown parameter values are estimated from batch uptake experiments on a robotic platform and from dynamic breakthrough experiments with miniaturized chromatographic columns. The identified model is then validated with respect to process optimization by comparison of model predictions with experimental data from a preparative scale column. In this study, a strong cation exchanger Toyopearl SP‐650M and lysozyme solved in phosphate buffer (pH 7), is used as the test system. The utilization of data from miniaturized and high throughput compatible experiments is shown to yield sufficiently accurate results, and minimizes efforts and costs for both parameter estimation and model validation.
ChemInform Abstract: Hydrogen Dissociative Chemisorption and Desorption on Saturated Subnano Palladium Clusters (Pdn, n = 2—9)
Authors: Zhou Chenggang , Yao Shujuan , Wu Jinping , Forrey Robert C. , Chen Liang , Tachibana Akitomo , Cheng Hansong 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis, Crystal Structure and Thermal Behavior of Trihydrated Acid Holmium Diphosphate HHoP2O7×3H2O.
Authors: Hraiech Sana , Chehimi‐Moumen Fathia , Goutaudier Christelle , Hassen‐Chehimi D. Ben , Trabelsi‐Ayadi Malika 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Crystal and Electronic Structure of La3Zn2‐xP4 — New Phosphide with Isolated P3‐ Species.
Authors: Lincke Hannes , Nilges Tom , Johrendt Dirk , Poettgen Rainer 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis, Chemical Bonding and Physical Properties of RERhB4 (RE: Y, Dy—Lu).
Authors: Veremchuk I. , Mori T. , Prots Yu. , Schnelle W. , Leithe‐Jasper A. , Kohout M. , Grin Yu. 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis, Crystal Structure, and Nonlinear Optical Properties of Bi2Cu5B4O14.
Authors: Pan Shilie , Smit Jared P. , Marvel Michael R. , Stampler Evan S. , Haag Jacob M. , Baek Jaewook , Halasyamani P. Shiv , Poeppelmeier Kenneth R. 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Structure and Chemical Bonding of PrRuSn.
Authors: Riecken Jan F. , Al Alam Adel F. , Chevalier Bernard , Matar Samir F. , Poettgen Rainer 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Ternary System V2O5—MoO3—Ag2O Diagram.
Authors: Wenda E. , Bielanski A. 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis and Crystal Structure of Bis(tetrapropylammonium) Hexabromotellurate(IV)‐bis{dibromoselenate(II)}, [NnPr4]2 [TeBr6(SeBr2)2], the Salt of a Mixed‐Valence Bromotellurate(IV)‐Selenate(II) Anion.
Authors: Janickis Vitalijus , Necas Marek 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Cupric Siliconiobate. Synthesis and Solid‐State Studies of a Pseudosandwich‐Type Heteropolyanion.
Authors: Anderson Travis M. , Alam Todd M. , Rodriguez Mark A. , Bixler Joel N. , Xu Wenqian , Parise John B. , Nyman May 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Silica‐Supported Dichlorophosphate Catalyzed Beckmann Rearrangement and Dehydration of Oximes under Microwave Irradiation.
Authors: Li Zheng , Lu Zhong 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Lewis Acid Promoted Oxidative Rearrangement of Tertiary Allylic Alcohols with the PhIO/TEMPO System.
Authors: Vatele Jean‐Michel 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Efficient and Chemoselective Reduction of Carbonyl Compounds with Supported Gold Catalysts under Transfer Hydrogenation Conditions.
Authors: Su Fang‐Zheng , He Lin , Ni Ji , Cao Yong , He He‐Yong , Fan Kang‐Nian 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Silica‐Assisted Suzuki—Miyaura Reactions of Heteroaryl Bromides in Aqueous Media.
Authors: Shi Shengyin , Zhang Yuhong 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: One‐Carbon Homologation of Unsymmetrical Ketones Through Magnesium β‐Oxido Carbenoid Rearrangement and Trapping the Enolate Intermediates with Electrophiles.
Authors: Tanaka Shu , Anai Takehiro , Tadokoro Makoto , Satoh Tsuyoshi 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Further Improvement on Sulfonamide‐Based Ligand for Catalytic Asymmetric 2‐Haloallylation and Allylation.
Authors: Zhang Zhiyu , Huang Jian , Ma Bin , Kishi Yoshito 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Radical 3‐exo‐tet Cyclization of 1,3‐Dihalopropanes with SmI2 to Form Cyclopropanes.
Authors: Ohkita Tsuyoshi , Tsuchiya Yuhsuke , Togo Hideo 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Asymmetric Synthesis of 3,4‐Annulated Cyclopentenones from Cycloalkenyl Ketones and Vinyl Carbamates by Diastereoselective Carbonyl Addition/Conrotatory 4π Ring Closure.
Authors: Siemer Michael , Froehlich Roland , Hoppe Dieter 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Palladium‐Mediated Fluorination of Arylboronic Acids.
Authors: Furuya Takeru , Kaiser Hanns Martin , Ritter Tobias 
Published: November 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.