bluuebunny/crossref_metadata_2025_split huggingface dataset:
Orientation of the Monomeric Porin OmpG in Planar Lipid Bilayers
Authors: Chen Min , Li Qiu‐Hong , Bayley Hagan 
Published: November 2008

AbstractOuter membrane protein G (OmpG) is a non‐selective porin from Escherichia coli. OmpG is a monomer, which makes it unusual among porins, and suggests that it may be useful in biotechnology. In planar lipid bilayers, individual OmpG pores reconstituted by insertion from detergent exhibit pronounced asymmetry in current‐voltage relationships and voltage‐dependent gating. Here, this asymmetry is used to deduce the orientation of OmpG in the bilayers. We introduced two cysteines into the extracellular loops of OmpG. Cleavage of the disulfide bond formed by these residues significantly increases spontaneous gating of the pore. By adding DTT to one side of the bilayer or the other, we demonstrated that pores showing a quiet trace at negative potentials have a “trans” conformation (extracellular loops on the trans side of the bilayer), while pores showing a quiet trace at positive potentials have a “cis” conformation (extracellular loops on the cis side). With this knowledge, we examined the binding of a cyclodextrin to OmpG. When the cyclodextrin was presented to the extracellular face of the pore, transient multisite interactions were observed. In contrast, when the cyclodextrin was presented to the periplasmic face, a more stable single‐site interaction occurred. Because the cyclodextrin can act as a molecular adapter by binding analytes, this information serves to advance the use of OmpG as a biosensor.
Intramolecular Charge Interactions as a Tool to Control the Coiled‐Coil‐to‐Amyloid Transformation
Authors: Pagel Kevin , Wagner Sara C. , Rezaei Araghi Raheleh , von Berlepsch Hans , Böttcher Christoph , Koksch Beate 
Published: November 2008

AbstractUnder the influence of a changed environment, amyloid‐forming proteins partially unfold and assemble into insoluble β‐sheet rich fibrils. Molecular‐level characterization of these assembly processes has been proven to be very challenging, and for this reason several simplified model systems have been developed over recent years. Herein, we present a series of three de novo designed model peptides that adopt different conformations and aggregate morphologies depending on concentration, pH value, and ionic strength. The design strictly follows the characteristic heptad repeat of the α‐helical coiled‐coil structural motif. In all peptides, three valine residues, known to prefer the β‐sheet conformation, have been incorporated at the solvent‐exposed b, c, and f positions to make the system prone to amyloid formation. Additionally, pH‐controllable intramolecular electrostatic repulsions between equally charged lysine (peptide A) or glutamate (peptide B) residues were introduced along one side of the helical cylinder. The conformational behavior was monitored by circular dichroism spectroscopic analysis and thioflavin T fluorescence, and the resulting aggregates were further characterized by transmission electron microscopy. Whereas uninterrupted α‐helical aggregates are found at neutral pH, Coulomb repulsions between lysine residues in peptide A destabilize the helical conformation at acidic pH values and trigger an assembly into amyloid‐like fibrils. Peptide B features a glutamate‐based switch functionality and exhibits opposite pH‐dependent folding behavior. In this case, α‐helical aggregates are found under acidic conditions, whereas amyloids are formed at neutral pH. To further validate the pH switch concept, peptide C was designed by including serine residues, thus resulting in an equal distribution of charged residues. Surprisingly, amyloid formation is observed at all pH values investigated for peptide C. The results of further investigations into the effect of different salts, however, strongly support the crucial role of intramolecular charge repulsions in the model system presented herein.
Label‐Free Colorimetric Detection of Trace Atrazine in Aqueous Solution by Using Molecularly Imprinted Photonic Polymers
Authors: Wu Zhen , Tao Cheng‐an , Lin Changxu , Shen Dezhong , Li Guangtao 
Published: November 2008

AbstractBased on the combination of colloidal‐crystal templating and a molecular imprinting technique, a sensor platform for efficient detection of atrazine in aqueous solution has been developed. The sensor is characterized by a 3D‐ordered interconnected macroporous structure in which numerous nanocavities derived from atrazine imprinting are distributed in the thin wall of the formed inverse polymer opal. Owing to the special hierarchical porous structure, the molecularly imprinted polymer opals (or molecularly imprinted photonic polymer; MIPP) allow rapid and ultrasensitive detection of the target analyte. The interconnected macropores are favorable for the rapid transport of atrazine in polymer films, whereas the inherent high affinity of nanocavites distributed in thin polymer walls allows MIPP to recognize atrazine with high specificity. More importantly, the atrazine recognition events of the created nanocavities can be directly transferred (label‐free) into a readable optical signal through a change in Bragg diffraction of the ordered macropores array of MIPP and thereby induce color changes that can be detected by the naked eye. With this novel sensory system, direct, ultrasensitive (as low as 10−8 ng mL−1), rapid (less than 30 s) and selective detection of atrazine with a broad concentration range varying from 10−16 M to 10−6 M in aqueous media is achieved without the use of label techniques and expensive instruments.
Reaching Optimal Light‐Induced Intramolecular Spin Alignment within Photomagnetic Molecular Device Prototypes
Authors: Ciofini Ilaria , Adamo Carlo , Teki Yoshio , Tuyèras Fabien , Lainé Philippe P. 
Published: November 2008

AbstractGround‐state (GS) and excited‐state (ES) properties of novel photomagnetic molecular devices (PMMDs) are investigated by means of density functional theory. These organic PMMDs undergo a ferromagnetic alignment of their intramolecular spins in the lowest ES. They are comprised of: 1) an anthracene unit (An) as both the photosensitizer (P) and a transient spin carrier (SC) in the triplet ES (3An*); 2) imino‐nitroxyl (IN) or oxoverdazyl (OV) stable radical(s) as the dangling SC(s); and 3) bridge(s) (B) connecting peripheral SC(s) to the An core at positions 9 and 10. Improving the efficiency of the PMMDs involves strengthening the ES intramolecular exchange coupling (JES) between transient and persistent SCs, hence the choice of 2‐pyrimidinyl (pm) as B elements to replace the original p‐phenylene (ph). Dissymmetry of the pm connectors leads to [SC‐B‐P‐B‐SC] regio‐isomers int. and ext., depending on whether the pyrimidinic nitrogen atoms point towards the An core or the peripheral SCs, respectively. For the int. regio‐isomers we show that the photoinduced spin alignment is significantly improved because the JES/kB value is increased by a factor of more than two compared with the ph‐based analogue (JES/kB>+400 K). Most importantly, we show that the optimal JES/kB value (≈+600 K) could be reached in the event of an unexpected saddle‐shaped structural distortion of the lowest ES. Accounting for this intriguing behavior requires dissection of the combined effects of 1) borderline intramolecular steric hindrance about key An–pm linkages, which translates into the flatness of the potential energy surface; 2) spin density disruption due to the presence of radicals; and 3) possibly intervening photochemistry, with An acting as a light‐triggered electron donor while pm, IN, and OV behave as electron acceptors. Finally, potentialities attached to the [(SC)‐pm‐An‐pm]int pattern are disclosed.
Folding and Anion‐Binding Properties of Fluorescent Oligoindole Foldamers
Authors: Kim Uk‐Il , Suk Jae‐min , Naidu Veluru Ramesh , Jeong Kyu‐Sung 
Published: November 2008

AbstractA series of oligoindole foldamers 1 a–d that are highly fluorescent were prepared by using a biindole derivative as the repeating unit, and their folding and anion‐binding properties were revealed by 1H NMR and fluorescence spectroscopy. The oligoindoles exist in an extended conformation, but adopt a compact helical structure in the presence of an anion. The anion is entrapped inside the tubular cavity of the helical strand, comprising four aryl units per turn, by multiple hydrogen bonds with the indole NHs. These structural features were confirmed by 1H NMR and fluorescence spectroscopy. When folded by anion binding, 1 b–d show characteristic downfield shifts of the NH signals and upfield shifts of the aromatic CH signals by Δδ=0.1–1.0 ppm. The average chemical shift for all the aromatic signals of 1 a–d is more upfield shifted as the chain lengthens, as anticipated from the degree of overlapped aromatic surfaces in the helical strand. Moreover, 1 a–d are strongly fluorescent in the absence of an anion. Upon binding an anion such as a chloride, the shorter oligoindoles 1 a and b lead to negligible change in the emission spectra, whereas the longer ones 1 c and d result in dramatic changes, that is, large hypochromic and bathochromic shifts (Δλ=65 and 70 nm) of the emission band, confirming the helical folding. The association constants (Ka) between oligoindoles and tetrabutylammonium chloride strongly depend on the chain length; <1 M−1 for 1 a, 630 M−1 for 1 b, 1.1×105 M−1 for 1 c, and 2.9×105 M−1 for 1 d in 20 % (v/v) MeOH/CH2Cl2 at 24±1 °C. In addition, the association constants of 1 c and 1 d with other anions such as fluoride, bromide, iodide, azide, cyanide, acetate, and nitrate are determined to be in the order of 103–106 M−1 under the same conditions.
ChemInform Abstract: Formation and Stability of the Gaseous Species LiAlCl4, Li2AlCl5 and LiAl2Cl7 — Mass Spectrometric and Quantum Chemical Studies.
Authors: Saal H. , Milke E. , Bruenig C. , Binnewies M. , Koeppe 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: Cr3+ Doping Optimization in CaAl2O4:Eu2+ Blue Phosphor.
Authors: Ryu H. , Bartwal K. S. 
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 Structure, Electronic Structure and Physical Properties of a New Semiconducting Thallium Antimony Selenide: Tl2.35Sb8.65Se14.
Authors: Xu Jianxiao , Assoud Abdeljalil , Cui Yanjie , Kleinke Holger 
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: Precursor‐Based Synthesis and Electrochemical Performance of LiMnPO4.
Authors: Bramnik Natalia N. , Ehrenberg Helmut 
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: Behavior of BrO3F and ClO3F Toward Strong Lewis Acids and the Characterization of [XO2][SbF6] (X: Cl, Br) by Single Crystal X‐Ray Diffraction, Raman Spectroscopy, and Computational Methods.
Authors: Lehmann John F. , Riedel Sebastian , Schrobilgen Gary J. 
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, Conversion and Comparison of the Photocatalytic and Electrochemical Properties of ZnSe×N2H4 and ZnSe Microrods.
Authors: Ni Yonghong , Zhang Lei , Zhang Li , Wei Xianwen 
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: Structural Features of Ge1Sb4Te7, an Intermetallic Compound in the GeTe—Sb2Te3 Homologous Series.
Authors: Matsunaga Toshiyuki , Kojima Rie , Yamada Noboru , Kifune Kouichi , Kubota Yoshiki , Takata Masaki 
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 Catalysis: Resin‐Bound Hydroxyprolylthreonine Derivatives in Enamine‐Mediated Reactions.
Authors: Carpenter Richard D. , Fettinger James C. , Lam Kit S. , Kurth Mark J. 
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: Solvent Controlled Divergent Syntheses of Polysubstituted Pyrroles and Pyrrolo[2,3‐b]‐1,4‐thiazines.
Authors: Cheng Ying , Kang Zhi‐Mei , Ma Yang‐Guang , Peng Jiang‐Hua , Liu Mei‐Fang 
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: Amberlite IRA900F as a Solid Fluoride Source for a Variety of Organic Transformations under Solvent‐Free Conditions.
Authors: Fringuelli Francesco , Lanari Daniela , Pizzo Ferdinando , Vaccaro Luigi 
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 of Indolines and Tetrahydroisoquinolines from Arylethylamines by PdII‐Catalyzed C—H Activation Reactions.
Authors: Li Jiao‐Jie , Mei Tian‐Sheng , Yu Jin‐Quan 
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: Novel Chemoselective Reduction of Aldehydes in the Presence of Other Carbonyl Moieties with Thiourea Dioxide.
Authors: Sambher Shikha , Baskar Chinnappan , Dhillon Ranjit S. 
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: Enantio‐ and Diastereoselective Catalytic Alkylation Reactions with Aziridines.
Authors: Moss Thomas A. , Fenwick David R. , Dixon Darren J. 
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: A Chiral Lewis Acid Strategy for Enantioselective Allylic C—H Oxidation.
Authors: Covell Dustin J. , White M. Christina 
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: A Highly Diastereo‐ and Enantioselective Synthesis of Multisubstituted Cyclopentanes with Four Chiral Carbons by the Organocatalytic Domino Michael—Henry Reaction.
Authors: Tan Bin , Chua Pei Juan , Zeng Xiaofei , Lu Min , Zhong Guofu 
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: Cobalt‐Catalyzed [2 + 2] Cycloaddition.
Authors: Treutwein Jonas , Hilt Gerhard 
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: A Novel Bis‐Thiourea Organocatalyst for the Asymmetric Aza‐Henry Reaction.
Authors: Rampalakos Constantinos , Wulff William D. 
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: Regioselective Synthesis of 4‐Alkyl‐ and 4‐Aryl‐6‐(perfluoroalkyl)salicylic Acid Derivatives by Formal [3 + 3] Cyclocondensation of 1,3‐Bis(silyloxy)‐1,3‐butadienes with 3‐Silyloxy‐1‐(perfluoroalkyl)prop‐2‐en‐1‐ones.
Authors: Buettner Stefan , Lubbe Mathias , Reinke Helmut , Fischer Christine , Langer Peter 
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: Zirconia‐Modified Superacid UDCaT‐5: An Efficient and Versatile Catalyst for Alkylation Reactions under Solvent‐Free Conditions.
Authors: Yadav Ganapati D. , Pathre Ganesh S. 
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: Rational Combination of Two Privileged Chiral Backbones: Highly Efficient Organocatalysts for Asymmetric Direct Aldol Reactions Between Aromatic Aldehydes and Acylic Ketones.
Authors: Chen Jia‐Rong , An Xiao‐Lei , Zhu Xiao‐Yu , Wang Xu‐Fan , Xiao Wen‐Jing 
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: Ruthenium Porphyrin‐Catalyzed Aerobic Oxidation of Terminal Aryl Alkenes to Aldehydes by a Tandem Epoxidation—Isomerization Pathway.
Authors: Jiang Gaoxi , Chen Jian , Thu Hung‐Yat , Huang Jie‐Sheng , Zhu Nianyong , Che Chi‐Ming 
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: Highly Efficient and Stereoselective Julia—Kocienski Protocol for the Synthesis of α‐Fluoro‐α,β‐unsaturated Esters and Weinreb Amides Employing 3,5‐Bis(trifluoromethyl)phenyl (BTFP) Sulfones.
Authors: Alonso Diego A. , Fuensanta Monica , Gomez‐Bengoa Enrique , Najera Carmen 
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: Highly Enantioselective Organocatalytic Carbonyl‐Ene Reaction with Strongly Acidic, Chiral Broensted Acids as Efficient Catalyst.
Authors: Rueping Magnus , Theissmann Thomas , Kuenkel Alexander , Koenigs Rene M. 
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: Indium(III) Iodide Mediated Strecker Reaction in Water: An Efficient and Environmentally Friendly Approach for the Synthesis of α‐Aminonitrile via a Three‐Component Condensation.
Authors: Shen Zhi‐Liang , Ji Shun‐Jun , Loh Teck‐Peng 
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: Chiral Lithium Salts of Phosphoric Acids as Lewis Acid—Base Conjugate Catalysts for the Enantioselective Cyanosilylation of Ketones.
Authors: Hatano Manabu , Ikeno Takumi , Matsumura Tokihiko , Torii Shinobu , Ishihara Kazuaki 
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: α‐Fluorination of β‐Ketosulfones by Selectfluor F—TEDA—BF4.
Authors: Loghmani‐Khouzani Hossein , Poorheravi Mohammad R. , Sadeghi Majid M. M. , Caggiano Lorenzo , Jackson Richard F. W. 
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.