bluuebunny/crossref_metadata_2025 huggingface dataset:
Thermal conductivity models for single and multiple filler carbon/liquid crystal polymer composites
Authors: Hauser Rebecca A. , Keith Jason M. , King Julia A. , Holdren Jennifer L.
Published: September 2008

In this study, two different carbon fillers (Thermocarb TC‐300 synthetic graphite and Fortafil 243 carbon fiber) were added to Vectra A950RX liquid crystal polymer to produce single filler composites with filler concentrations of up to 80 wt % (71.4 vol %) and multiple filler composites that contained varying concentrations of both synthetic graphite and carbon fiber. The through‐plane and in‐plane thermal conductivity for each formulation was measured. For the single filler synthetic graphite and carbon fiber composites, the Nielsen model was applied to the experimental through‐plane thermal conductivity data. The parameters obtained from the single filler models were then used along with a variation of the original Nielsen model to predict the through‐plane thermal conductivities of the multiple filler composites. In‐plane thermal conductivity models were also developed using a correlation involving the square root of the product of the composite in‐plane and through‐plane thermal conductivities. This model was applied to the single filler synthetic graphite and carbon fiber composites. A variation of this model was then used to predict the in‐plane thermal conductivity for composites containing both fillers. All the models presented in this work showed good agreement with experimental data. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Synthesis, characterization, and properties of polypyrrole/expanded vermiculite intercalated nanocomposite
Authors: Lin Jianming , Tang Qunwei , Wu Jihuai , Sun Hui
Published: September 2008

The conductive polypyrrole (PPy) is intercalated into the interlayers of expanded vermiculite (EVMT) to produce the nanocomposite with high conductivity by a synchronous polymerization of pyrrole and intercalation of PPy reaction in aqueous solution. The structures and properties are characterized by the nanocomposite using powder X‐ray diffraction, Fourier transform infrared spectroscopy, conductivity measurements, and stability measurements. The nanocomposite exhibited a typical percolation phenomena and the percolation threshold is around mass ratio for pyrrole to EVMT 0.22. Under optimized conditions, a PPy/EVMT intercalated nanocomposite with conductivity of 67 S cm−1 is obtained. The intercalated nanocomposite has a good environmental stability. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Compatibility study in poly(tetramethyleneadipate‐co‐terephthalate)/polystyrene bioblends
Authors: Biresaw Girma , Mohamed Abdellatif , Gordon Sherald H. , Harry‐O'kuru Rogers E. , Carriere Craig C.
Published: September 2008

Bioblends of the biodegradable copolyester poly(tetramethyleneadipate‐co‐terephthalate) (EBU) and polystyrene (PS) were prepared in different weight compositions on a twin‐screw extruder at 160–200°C. The various bioblend compositions were then investigated using thermogravimetric analysis (TGA), modulated differential scanning calorimetry (MDSC), and Fourier transform infrared photoacoustic spectroscopy (FTIR‐PAS). TGA studies showed that 25/75 and 50/50 EBU/PS blends had higher thermal stability than the more thermally stable blend component, PS. The MDSC studies showed a single Tg and single Tm for the blends, that were concentration independent. The FTIR‐PAS studies indicated a small shift (4–8 cm−1) in the carbonyl absorption peaks of EBU to lower wavenumbers in 50/50 EBU/PS blend relative to that of neat EBU. It is concluded that, while the MDSC results were inconclusive, the TGA and FTIR‐PAS results support the existence of some degree of intermolecular interaction between EBU and PS components and, hence, partial compatibility in EBU/PS blends. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Synthesis and characterization of new optically active polyesters by step‐growth polymerization of novel aromatic (2S)‐4‐[(4‐methyl‐2‐phthalimidyl‐pentanoylamino)benzoylamino]isophthalic acid with aromatic diols
Authors: Mallakpour Shadpour , Sepehri Saghi
Published: September 2008

A new diacid monomer 9 was synthesized in five steps. Starting from the reaction of L‐leucine with phthalic anhydride in acetic acid provided (2S)‐4‐methyl‐2‐phthalimidylpentanoic acid (3) in good yield. The compound 3 was converted to (2S)‐4‐methyl‐2‐phthalimidylpentanoyl chloride (4) by reaction with thionyl chloride. The resulting acid chloride 4 was reacted with p‐aminobenzoic acid (5) in dry tetrahydrofuran and (2S)‐4‐(4‐methyl‐2‐phthalimidylpentanoyl‐amino)benzoic acid (6) was obtained. Then, it was converted to (2S)‐4‐(4‐methyl‐2‐phthalimidylpentanoylamino)benzoyl chloride (7) by treatment with thionyl chloride. The reaction of acid chloride 7 with 5‐aminoisophthalic acid in dry N,N‐dimethylacetamide (DMAc) gave (2S)‐4‐[(4‐methyl‐2‐phthalimidylpentanoylamino)‐benzoylamino]isophthalic acid (9) in high yield. The step‐growth polymerization of this diacid with several aromatic diols, such as bisphenol‐A (10a), phenolphthalein (10b), 1,5‐naphthalenediol (10c), hydroquinone (10d), bisphenyl‐2,2′‐diol (10e), 4,4′‐dihydroxydiphenyl sulfone (10f), 4,4′‐dihydroxydiphenyl sulfide (10g), and 1,8‐dihydroxyanthraquinone (10h), was carried out in a system of tosyl chloride, pyridine, and N,N‐dimethylformamide (DMF) to give a series of new optically active polyesters (PE)s with good yield and moderate inherent viscosity ranging from 0.29 to 0.43 dL/g. All of the aforementioned polymers were fully characterized by FTIR and specific rotation. Some structural characterization was performed by 1H NMR and elemental analysis. These polymers are readily soluble in amide‐type solvents such as DMF, DMAc, dimethyl sulfoxide, and protic solvents such as sulfuric acid. Thermal gravimetry analysis showed that the 10% weight loss temperature in a nitrogen atmosphere was more than 360°C, which indicates that the resulting PEs have a good thermal stability as well as excellent solubility. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Investigation of the thermal decomposition behavior and kinetic analysis of PTT/phenoxy blends
Authors: Farmahini‐Farahani M. , Jafari S. H. , Khonakdar H. A. , Böhme F. , Yavari A. , Tarameshlou M.
Published: September 2008

Thermal decomposition of binary blends composed of poly(trimethylene terephthalate) (PTT) and a phenoxy resin, namely poly(hydroxy ether) of bisphenol A, and prepared by melt blending was studied using thermogravimetric analysis. The thermal decomposition behavior of the blends could be explained in terms of formation and loss of hydrogen bonds and appearance of both low and high molecular weight species due to transesterification reaction between hydroxyl groups of phenoxy with ester bonds of PTT. The kinetics of decomposition reaction was analyzed by Freeman–Carroll, Friedman, Chang, and Vachuska–Voboril methods. It was found that all of the methods well described the decomposition reaction of the blends. The correlation between the calculated values and the chemical nature of the blends was acceptable. Among all the investigated methods the Chang method showed the best correlation with the experimental data. FTIR spectroscopy was employed to study the chemical structure of the blends. The results revealed strong interaction between the blend components in the form of hydrogen bonding. Progress of these interactions was followed with time and temperature. The effects of blending and loss of hydrogen bonding on degradation behavior in this kind of reactive blends were emphasized. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Effects of ultraviolet irradiation on the static and dynamic properties of neoprene rubbers
Authors: Chou Hsoung‐Wei , Huang Jong‐Shin
Published: September 2008

Rubbers deteriorate when they are exposed to ultraviolet irradiation for long periods of time. By conducting a series of hardness measurements and simple tension tests, the static properties of neoprene rubbers before and after exposure to various durations of ultraviolet irradiation were first measured. It is found that the Shore A hardness and tensile modulus of neoprene rubbers after exposure to ultraviolet irradiation are increased but their elongation at break, tensile strength, and energy to break are significantly decreased. On the basis of a complex spring model of a vibration system, the dynamic shear properties of neoprene rubbers before and after exposure to different durations of ultraviolet irradiation were then determined from the experimental results of dynamic transmissibility tests. It is also found that the storage modulus, loss modulus, and loss factor of neoprene rubbers are drastically affected by the duration of ultraviolet irradiation they experienced. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
[Ru(bpy)2(dcbpy)NHS] Labeling/Aptamer‐Based Biosensor for the Detection of Lysozyme by Increasing Sensitivity with Gold Nanoparticle Amplification
Authors: Bai Jianguo , Wei Hui , Li Bingling , Song Lihua , Fang Lanyun , Lv Zhaozi , Zhou Weihong , Wang Erkang
Published: September 2008

A novel [Ru(bpy)2(dcbpy)NHS] labeling/aptamer‐based biosensor combined with gold nanoparticle amplification for the determination of lysozyme with an electrochemiluminescence (ECL) method is presented. In this work, an aptamer, an ECL probe, gold nanoparticle amplification, and competition assay are the main protocols employed in ECL detection. With all the protocols used, an original biosensor coupled with an aptamer and [Ru(bpy)2(dcbpy)NHS] has been prepared. Its high selectivity and sensitivity are the main advantages over other traditional [Ru(bpy)3]2+ biosensors. The electrochemical impedance spectroscopy (EIS) and atomic force microscopy (AFM) characterization illustrate that this biosensor is fabricated successfully. Finally, the biosensor was applied to a displacement assay in different concentrations of lysozyme solution, and an ultrasensitive ECL signal was obtained. The ECL intensity decreased proportionally to the lysozyme concentration over the range 1.0×10−13–1.0×10−8 mol L−1 with a detection limit of 1.0×10−13 mol L−1. This strategy for the aptasensor opens a rapid, selective, and sensitive route for the detection of lysozyme and potentially other proteins.
Controlled Self‐Assembly of Functional Metal Octaethylporphyrin 1 D Nanowires by Solution‐Phase Precipitative Method
Authors: So Man‐Ho , Roy V. A. L. , Xu Zong‐Xiang , Chui Stephen Sin‐Yin , Yuen Mai‐Yan , Ho Chi‐Ming , Che Chi‐Ming
Published: September 2008

Metal octaethylporphyrin M(OEP) (M=Ni, Cu, Zn, Pd, Ag, and Pt) nanowires are fabricated by a simple solution‐phase precipitative method. By controlling the composition of solvent mixtures, the diameters and lengths of the nanowires can be varied from 20 to 70 nm and 0.4 to 10 μm, respectively. The Ag(OEP) nanowires have lengths up to 10 μm and diameters of 20–70 nm. For the M(OEP) nanowires, the growth orientation and packing of M(OEP) molecules are examined by powder XRD and SAED measurements, revealing that these M(OEP) nanowires are formed by the self‐assembly of M(OEP) molecules through intermolecular π⋅⋅⋅π interactions along the π⋅⋅⋅π stacking axis, and the M2+ ion plays a key role in the nanowire formation. Using the bottom contact field effect transistor structure and a simple drop‐cast method, a single‐crystal M(OEP) nanowires‐based field effect transistor can be readily prepared with prominent hole transporting behaviour and charge‐carrier mobility up to 10−3–10−2 cm2 V−1 s−1 for holes, which are 10 times higher than that of vacuum‐deposited M(OEP) organic thin‐film transistors (OTFTs).
Trinuclear Rhodium Complexes and Their Relevance for Asymmetric Hydrogenation
Authors: Preetz Angelika , Baumann Wolfgang , Drexler Hans‐Joachim , Fischer Christian , Sun Jiangtao , Spannenberg Anke , Zimmer Oswald , Hell Wolfgang , Heller Detlef
Published: September 2008

Various trinuclear rhodium complexes of the type [Rh3(PP)3(μ3‐OH)x(μ3‐OMe)2−x]BF4 (where PP=Me‐DuPhos, dipamp, dppp, dppe; different ligands and μ‐bridging anions) are presented, which are formed upon addition of bases such as NEt3 to solvate complexes [Rh(PP)(solvent)2]BF4. They were extensively characterized by X‐ray diffraction and NMR spectroscopy (103Rh, 31P, 13C, 1H). Their in situ formation resulting from basic additives (NEt3) or basic prochiral olefins (without addition of another base) can cause deactivation of the asymmetric hydrogenation. This effect can be reversed by means of acidic additives.
A Novel Supramolecular System: Combination of Two Switchable Processes in a [2]Rotaxane
Authors: Li Junbo , Li Yongjun , Guo Yanbing , Xu Jialiang , Lv Jing , Li Yuliang , Liu Huibiao , Wang Shu , Zhu Daoben
Published: September 2008

A novel supramolecular system, which is made up of a dibenzo[24]crown‐8 (DB24C8) ring component linked with a calix[4]arene derivative, a dumbbell component, containing a secondary ammonium center (‐NR2H2+‐) and a 4,4′‐bipyridinium (BIPY2+) unit, and stoppered with two 3,5‐di‐tert‐butylphenyl groups on the two termini of the dumbbell component, has been synthesized. The system displays a combination of two processes: the pH‐induced shuttling of a DB24C8 ring and the complexation/decomplexation of K+ ions. The switching process of this supramolecular system was investigated in detail by 1H NMR spectroscopy. The results showed that the supramolecular system can only switch smoothly in CD3CN. The two separated switchable processes can run together smoothly in this supramolecular system.
Elaboration of rac‐Like Active Species from Lewis Base Functionalized Unbridged Zirconocenes for Isospecific Propylene Polymerization
Authors: Kim Hwa Kyu , Kim Seong Kyun , Park Jun Ha , Yoon Seung Woong , Lee Min Hyung , Do Youngkyu
Published: September 2008

A series of ortho or meta Lewis base functionalized unbridged zirconocenes, [{1‐(En‐Ph)‐3,4‐Me2C5H2}2ZrCl2] (E=NMe2, OMe; n=1, 2), and a half‐functionalized zirconocene, [{1‐(p‐Me2NC6H4)‐3,4‐Me2C5H2}{1‐(p‐tolyl)‐3,4‐Me2C5H2}ZrCl2], were prepared. The crystal structures of these compounds determined by X‐ray diffraction revealed the presence of only C2‐symmetric rac‐like isomers in the asymmetric units. In combination with methylaluminoxane (MAO) cocatalyst, the meta‐functionalized complexes afforded mixtures of polymers that exhibit multimelting transition temperatures and broad molecular‐weight distributions (MWDs) in propylene polymerization at atmospheric monomer pressure, whereas the ortho‐functionalized complexes did not give rise to polymerization. Stepwise solvent extraction of the polymer mixtures showed that the polymers consist of amorphous, moderately isotactic, and highly isotactic portions, the weight ratio of which is dependent on the reaction temperature. 13C NMR spectral analysis indicated that the [mmmm] methyl pentad value of the isotactic portion reached around 90 %. Among the meta‐functionalized zirconocenes, the di‐OMe‐substituted one afforded the largest amount of the isotactic portion at all temperatures, and the portion comprised 82 wt % of the crude polymer obtained at 25 °C. In contrast, propylene polymerization with the half‐functionalized unbridged zirconocene resulted in the formation of nearly atactic polypropylene with a narrow MWD of around 2. These results corroborate the proposition that the rigid rac‐like cation–anion ion pair of type [rac‐L2ZrP]+[Me‐MAO]− generated in situ, through Lewis acid–base interactions between the functional groups and [Me‐MAO]−, is responsible for the isospecific propylene polymerization with the given class of functionalized unbridged zirconocenes and further indicate that the formation of such ion pairs can be favored by difunctionalization at the meta position of the phenyl ring with OMe groups.
Solid state and solution conformations of a hybrid αγααγα hexapeptide. Characterization of a backbone expanded analog of the α‐polypeptide 310‐helix
Authors: Chatterjee Sunanda , Vasudev Prema G. , Raghothama Srinivasarao , Shamala Narayanaswamy , Balaram Padmanabhan
Published: September 2008

The stereochemically constrained γ amino acid residue gabapentin (1‐(aminomethyl)cyclohexaneacetic acid, Gpn) has been incorporated into a host α‐peptide sequence. The structure of a hybrid αγααγα peptide, Boc‐Leu‐Gpn‐Aib‐Leu‐Gpn‐Aib‐OMe in crystals reveals a continuous helical conformation stabilized by three intramolecular 4 → 1 C12 hydrogen bonds across the αγ/αγ segments and one C10 hydrogen bond across the central αα segment. This conformation corresponds to an expanded analog of the canonical all‐α polypeptide 310‐helix, with insertion of two additional backbone atoms at each γ residue. Solvent dependence of NH chemical shifts in CDCl3 solution are consistent with conformation in which the NH groups of Aib (3), Leu (4), Gpn (5), and Aib (6) are hydrogen bonded, a feature observed in the solid state. The nonsequential NOEs between Gpn (2) NH ↔ Leu (4) NH and Gpn (2) NH ↔ Gpn (5) NH support the presence of additional conformations in solution. Temperature‐dependent line broadening of NH resonances confirms the occurrence of rapid exchange between multiple conformations at room temperature. Two conformational models which rationalize the observed nonsequential NOEs are presented, both of which contain three hydrogen bonds and are consistent with the known stereochemical preferences of the Gpn residue. © 2008 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 85:759–771, 2008.

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
Influence of charge and size of terminal amino‐acid residues on local conformational states and shape of alanine‐based peptides
Authors: Makowska Joanna , Bagińska Katarzyna , Skwierawska Agnieszka , Liwo Adam , Chmurzyński Lech , Scheraga Harold A.
Published: September 2008

We present results of conformational studies by Circular dichroism and NMR spectroscopy, differential scanning calorimetry, and molecular dynamics, of three alanine‐based peptides: Ac‐KK‐(A)7‐KK‐NH2 (KAK), Ac‐OO‐(A)7‐DD‐NH2 (OAD), and Ac‐KK‐(A)7‐EE‐NH2 (KAE), where A, K, O, D, and E, denote alanine, lysine, ornithine, aspartic acid, and glutamic acid residues, respectively. For OAD and KAE, canonical MD simulations with time‐averaged NMR‐derived restraints demonstrate the presence of an ensemble of structures with a variety of conformational states (polyproline II, α‐helical, α′, and extended, turn); for KAK the conformational states are predominantly polyproline II and extended. The OAD peptide exhibits a bent shape with its ends close to each other, whereas KAK and KAE are more extended. The bent shape was also observed in our earlier study of the Ac‐XX‐(A)7‐OO‐NH2 (XAO) peptide, where X denotes the diaminobutyric acid residue; therefore, the shape seems to depend on the size of the charged side chains at the ends of the alanine sequence and not on their kind. This suggests that the bent shape of the alanine sequence is formed to enable screening of this nonpolar sequence from the solvent by sufficiently short charged side chains. As in our previous study of the XAO peptide, no long polyproline II segments were observed. © 2008 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 85:772‐782, 2008.

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
Conformational studies of the C‐terminal 16‐amino‐acid‐residue fragment of the B3 domain of the immunoglobulin binding protein G from Streptococcus
Authors: Skwierawska Agnieszka , Ołdziej Stanisław , Liwo Adam , Scheraga Harold A.
Published: September 2008

The structure and stability of the 16‐amino‐acid‐residue fragment [IG(46–61)] corresponding to the C‐terminal β‐hairpin of the B3 domain of the immunoglobulin binding protein G from Streptococcus was investigated by means of CD and NMR spectroscopy and by differential scanning calorimetry. The CD and 2D NMR experiments were carried out (i) in water at different temperatures and (ii) at one temperature (305 K), with only CD, at different TFE concentrations. Our results show that the IG(46–61) peptide possesses organized three‐dimensional structure at all investigated temperatures. The three‐dimensional structure of the IG(46–61) peptide resembles the general shape of a β‐hairpin that is also observed for this peptide in the experimental structure of the B3 domain in the whole G protein; the structure is stabilized by hydrophobic interactions between nonpolar side chains. Our study shows that the melting temperature of the IG(46–61) peptide is about 320 K which supports the hypothesis that the investigated peptide can serve as a folding initiation site of the B3 domain of the immunoglobulin binding protein G. © 2008 Wiley Periodicals, Inc. Biopolymers 91: 37–51, 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
Polymorphisms of the matrix metalloproteinase 9 gene and abdominal aortic aneurysm
Authors: Smallwood L , Allcock R , van Bockxmeer F , Warrington N , Palmer L J , Iacopetta B , Golledge J , Norman P E
Published: September 2008

Background

Increased matrix metalloproteinase (MMP) 9 activity has been implicated in the formation of abdominal aortic aneurysm (AAA). The aim was to explore the association between potentially functional variants of the MMP-9 gene and AAA.

Methods

The − 1562C > T and − 1811A > T variants of the MMP-9 gene were genotyped in 678 men with an AAA (at least 30 mm in diameter) and 659 control subjects (aortic diameter 19–22 mm) recruited from a population-based trial of screening for AAA. Levels of MMP-9 were measured in a random subset of 300 cases and 84 controls. The association between genetic variants (including haplotypes) and AAA was assessed by multivariable logistic regression.

Results

There was no association between the MMP-9 − 1562C > T (odds ratio (OR) 0·70 (95 per cent confidence interval (c.i.) 0·27 to 1·82)) or − 1811A > T (OR 0·71 (95 per cent c.i. 0·28 to 1·85)) genotypes, or the most common haplotype (OR 0·81 (95 per cent c.i. 0·62 to 1·05)) and AAA. The serum MMP-9 concentration was higher in cases than controls, and in minor allele carriers in cases and controls, although the differences were not statistically significant.

Conclusion

In this study, the genetic tendency to higher levels of circulating MMP-9 was not associated with AAA.
Topical haemostatic agents
Authors: Seyednejad H , Imani M , Jamieson T , Seifalian A M
Published: September 2008

Background

A variety of local haemostatic agents is now available to stop troublesome bleeding. These agents are indicated for use during surgical interventions where conventional methods of haemostasis are not applicable because of the site of surgery or the degree of bleeding.

Method

A literature search using the PubMed and ISI Web of Knowledge databases identified relevant studies on topical haemostatic agents. Manufacturers' recommendations were also sought through commercial websites.

Results and conclusion

A significant body of evidence now exists to support the use of topical haemostatic agents in a wide variety of clinical situations. The advantages and disadvantages of many of these agents are highlighted.
Magnetic resonance imaging and the acute abdomen
Authors: Stoker J
Published: September 2008

Work in progress
Stenting and colorectal cancer
Authors: Hill J
Published: September 2008

A warning
Meta-analysis of sentinel node biopsy in ductal carcinoma in situ of the breast (Br J Surg 2008; 95: 547–554)
Authors: Meijnen P , Th. Rutgers E J
Published: September 2008

The Editors welcome topical correspondence from readers relating to articles published in the Journal. Responses should be sent electronically via the BJS website (www.bjs.co.uk). All letters will be reviewed and, if approved,appear on the website. A selection of these will be edited and published in the Journal. Letters must be no more than 250 words in length.
‘It's gotten a bit old, charity’: Young adults in New Zealand talk about poverty, charitable giving and aid appeals
Authors: Dalton S. , Madden H. , Chamberlain K. , Carr S. , Lyons A. C.
Published: September 2008

An extensive body of literature exists on the phenomena of poverty, charitable giving and the effectiveness of aid appeals. To date psychological research has predominantly focused on individualistic models to explain people's understandings of poverty and their charitable giving practices. Based upon a social constructionist epistemology, this study investigates how understandings of aid appeals, poverty and charitable giving are discursively produced and constructed in relation to one another through an analysis of New Zealand young adults' talk about these issues. Data were collected from three focus group discussions among pre‐existing friendship groups comprising three male and nine female students aged between 18 and 25. A brief video clip of aid appeals was used to stimulate discussion on poverty and charitable giving. Analysis of these discussions revealed three discursive themes relating to the aid appeals: local versus international need, emotional arousal and insufficient information. Drawing upon these themes the participants constructed poverty as relative or extreme, and largely explained by educational deficits. They constructed charitable giving as solicited through aid appeals, as compromised through immunity to such appeals, and as diminished through positionings of self‐help and self‐responsibility. These discursive constructions were drawn on by participants to legitimate their own non‐donor position. Copyright © 2008 John Wiley & Sons, Ltd.
Studies of the Structure of the N‐Terminal Domain from the Y4 Receptor—a G Protein‐Coupled Receptor—and its Interaction with Hormones from the NPY Family
Authors: Zou Chao , Kumaran Sowmini , Markovic Stefan , Walser Reto , Zerbe Oliver
Published: September 2008

Binding of peptide hormones to G protein‐coupled receptors is believed to be mediated through formation of contacts of the ligands with residues of the extracellular loops of family 1 GPCRs. Here we have investigated whether additional binding sites exist within the N‐terminal domain, as studied in the form of binding of peptides from the neuropeptide Y (NPY) family to the N terminus of the Y4 receptor (N‐Y4). The N‐terminal domain of the Y4 receptor has been expressed in isotopically enriched form and studied by solution NMR spectroscopy. The peptide is unstructured in solution, whereas a micelle‐associated helical segment is formed in the presence of dodecylphosphocholine (DPC) or sodium dodecylsulfate (SDS). As measured by surface plasmon resonance (SPR) spectroscopy, N‐Y4 binds with approximately 50 μM affinity to the pancreatic polypeptide (PP), a high‐affinity ligand to the Y4 receptor, whereas binding to neuropeptide Y (NPY) and peptide YY (PYY) is much weaker. Residues critical for binding in PP and in N‐Y4 have been identified by site‐directed mutagenesis. The data indicate that electrostatic interactions dominate and that this interaction is mediated by acidic ligand and basic receptor residues. Residues of N‐Y4 are likely to contribute to the binding of PP, and in addition might possibly also help to transfer the hormone from the membrane‐bound state into the receptor binding pocket.
Reactions of Uranium Atoms with Ammonia: Infrared Spectra and Quasi‐Relativistic Calculations of the U:NH3, H2NUH, and HNUH2 Complexes
Authors: Wang Xuefeng , Andrews Lester , Marsden Colin J.
Published: September 2008

Ammonia molecules interact with U atoms, and the resulting U:NH3 complex rearranges upon visible irradiation to form the H2NUH and HNUH2 molecules in excess argon. These products are identified by functional group frequencies, 15NH3 and ND3 isotopic shifts, and comparison to frequencies calculated by using density functional theory. The NU π bond in HNUH2 is enhanced by partial triple‐bond character through N(2p) to U(5f) conjugation, which is comparable to that found in the analogous HNThH2 molecule. These products also form complexes with additional ammonia molecules in the matrix. The interesting higher‐energy NUH3 complex is not formed.
Improving Photocurrent Generation: Supramolecularly and Covalently Functionalized Single‐Wall Carbon Nanotubes–Polymer/Porphyrin Donor–Acceptor Nanohybrids
Authors: Rahman G. M. Aminur , Troeger Anna , Sgobba Vito , Guldi Dirk M. , Jux Norbert , Balbino Domenico , Tchoul Maxim N. , Ford Warren T. , Mateo‐Alonso Aurelio , Prato Maurizio
Published: September 2008

Electrostatic interactions: A versatile donor–acceptor system has been constructed by exploiting the electrostatic interactions between covalently and noncovalently polymer‐functionalized SWNTs (i.e., SWNT–PVBTAn+ and SWNT/PVBTAn+) and porphyrins (i.e., H2P8− or ZnP8−). The nanohybrids thus formed afford long‐lived radical–ion pairs and valuable photocurrent conversions (see figure).

magnified image

Novel nanohybrids based on covalently and noncovalently functionalized single‐wall carbon nanotubes (SWNTs) have been prepared and assembled for the construction of photoactive electrodes. Polymer‐grafted SWNTs were synthesized by free‐radical polymerization of (vinylbenzyl)trimethylammonium chloride. Poly[(vinylbenzyl)trimethylammonium chloride] (PVBTAn+) was also noncovalently wrapped around SWNTs to form stable, positively charged SWNT/PVBTAn+ suspensions in water. Versatile donor–acceptor nanohybrids were prepared by using the electrostatic/van der Waals interactions between covalent SWNT–PVBTAn+ and/or noncovalent SWNT/PVBTAn+ and porphyrins (H2P8− and/or ZnP8−). Several spectroscopic, microscopic, transient, and photoelectrochemical measurements were taken to characterize the resulting supramolecular complexes. Photoexcitation of the nanohybrids afforded long‐lived radical ion pairs with lifetimes as long as 2.2 μs. In the final part, photoactive electrodes were constructed by using a layer‐by‐layer technique on an indium tin oxide covered glass support. Photocurrent measurements gave remarkable internal photon‐to‐current efficiencies of 3.81 and 9.90 % for the covalent ZnP8−/SWNT–PVBTAn+ and noncovalent ZnP8−/SWNT/PVBTAn+ complex, respectively, when a potential of 0.5 V was applied.
Reactions of 16e CpCo Half‐Sandwich Complexes Containing a Chelating 1,2‐Dicarba‐closo‐dodecaborane‐1,2‐dichalcogenolate Ligand with Ethynylferrocene and Dimethyl Acetylenedicarboxylate
Authors: Xu Bao‐Hua , Peng Xu‐Qing , Li Yi‐Zhi , Yan Hong
Published: September 2008

The reaction of the 16e half‐sandwich complex [CpCo(S2C2B10H10)] (1 S; Cp: cyclopentadienyl) with ethynylferrocene in CH2Cl2 at ambient temperature leads to [CpCo(S2C2B10H9)(CH2CFc)] (2 S; Fc: ferrocenyl) and 1,2,4‐triferrocenylbenzene. In 2 S, B substitution occurs at the carborane cage in the position B(3)/B(6) with the formation of a CB bond. In the presence of the protic solvent MeOH, 2 S loses a CpCo fragment to generate [(CH2CFc)(S2C2B10H9)] (3 S). On the other hand, 2 S can take a free CpCo fragment to form [(CpCo)2(S2C2B9H8)(CHCFc)] (4 S) containing a nido‐C2B9 unit. In sharp contrast, [CpCo(Se2C2B10H10)] (1 Se) does not react with the alkyne in CH2Cl2, but in MeOH [(CHCFc)(Se2C2B10H10)] (5 Se) is generated without the presence of a CpCo unit. The reaction of 1 with dimethyl acetylenedicarboxylate at ambient temperature leads to insertion compounds [CpCo(E2C2B10H10){(MeO2C)CC(CO2Me)}] (6 S, E=S; 6 Se, E=Se). Upon heating, 6 S rearranges to two geometrical isomers [CpCo(S2C2B10H9){(MeO2C)CCH(CO2Me)}] (7 S) and [CpCo(S2C2B10H9){(MeO2C)CHC(CO2Me)}] (8 S). In both, BH functionalization takes place at the carborane cage in the position B(3)/B(6), but 7 S is a 16e complex with an olefinic unit in a Z configuration, and 8 S is an 18e complex containing an alkyl BCH group. Further treatment of 7 S with dimethyl acetylenedicarboxylate at ambient temperature affords two B‐disubstituted complexes at the carborane cage in the positions of the B(3) and B(6) sites, that is, [CpCo(S2C2B10H8){(MeO2C)CCH(CO2Me)}2] (9 S) and [CpCo(S2C2B10H8){(MeO2C)CHC(CO2Me)}{(MeO2C)CCH(CO2Me)}] (10 S). Compound 9 S is a 16e complex with two olefinic units in E/E configurations, whereas 10 S is an 18e species containing both an olefinic substituent and an alkyl BCH unit. The reaction of 7 S with methyl acetylenemonocarboxylate at ambient temperature leads to the sole 16e compound [CpCo(S2C2B10H8){CHCH(CO2Me)}{(MeO2C)CCH(CO2Me)}] (11 S). In contrast, 6 Se does not rearrange. All new complexes 2 S–4 S, 5 Se, 6 Se, and 7 S–11 S were characterized by NMR spectroscopy (1H, 11B, 13C) and X‐ray structural analyses were performed for 2 S–4 S, 5 Se, 6 Se, and 7 S–9 S.
ChemInform Abstract: Stochastic Search of the Quantum Conformational Sapce of Small Lithium and Bimetallic Lithium—Sodium Clusters
Authors: Perez Jhon F. , Florez Elizabeth , Hadad Cacier Z. , Fuentealba Patricio , Restrepo Albeiro
Published: September 2008

ChemInform 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: Vanadium Oxide Compounds with Quantum Monte Carlo
Authors: Bande Annika , Luechow Arne
Published: September 2008

ChemInform 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: Silver(I) Chalcogenide Halides Ag19Te6Br7, Ag19Te6Br5.4I1.6, and Ag19Te5SeBr7.
Authors: Nilges Tom , Messel Julia , Bawohl Melanie , Lange Stefan
Published: September 2008

ChemInform 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: Origins of Superstructure Ordering and Incommensurability in Stuffed CoSn‐Type Phases.
Authors: Fredrickson Daniel C. , Lidin Sven , Venturini Gerard , Malaman Bernard , Christensen Jeppe
Published: September 2008

ChemInform 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: The Crystal Structure of LiMgAlD6 from Combined Neutron and Synchroton X‐Ray Powder Diffraction.
Authors: Grove Hilde , Brinks Hendrik W. , Loevvik Ole M. , Heyn Richard H. , Hauback Bjoern C.
Published: September 2008

ChemInform 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 and Electronic Properties of New Uranium Intermetallic Compound UGa1.85Zr0.15.
Authors: Havela L. , Andreev A. V. , Goncalves A. P. , Sebek J. , Sechovsky V. , Popov Y. F.
Published: September 2008

ChemInform 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: Neutron Powder Diffraction and Solid‐State Deuterium NMR Studies of Ca2RuD6 and the Stability of Transition Metal Hexahydride Salts.
Authors: Moyer Ralph O. Jr. , Antao Sytle M. , Toby Brian H. , Morin Frederick G. , Gilson Denis F. R.
Published: September 2008

ChemInform 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: Optimization of Pr3+, Tb3+, and Sm3+ Co‐Doped (Y0.65Gd0.35) BO3:Eu0.053+ VUV Phosphors Through Combinatorial Approach.
Authors: Chen Lei , Fu Yibing , Zhang Guobin , Bao Jun , Gao Chen
Published: September 2008

ChemInform 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: Magnetic Order Close to Superconductivity in the Iron‐Based Layered LaO1‐xFxFeAs Systems.
Authors: de la Cruz Clarina , Huang Q. , Lynn J. W. , Li Jiying , Ratcliff W. II , Zarestky J. L. , Mook H. A. , Chen G. F. , Luo J. L. , Wang N. L. , et al. et al.
Published: September 2008

ChemInform 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 Magnetic Properties of Oxychalcogenides A2F2Fe2OQ2 (A: Sr, Ba; Q: S, Se) with Fe2O Square Planar Layers Representing an Antiferromagnetic Checkerboard Spin Lattice.
Authors: Kabbour Houria , Janod Etienne , Corraze Benoit , Danot Michel , Lee Changhoon , Whangbo Myung‐Hwan , Cario Laurent
Published: September 2008

ChemInform 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 N‐Deficient GaN and Its Enhanced Dielectric Responses.
Authors: Song B. , Jian J. K. , Wang G. , Lei M. , Bao H. Q. , Chen X. L.
Published: September 2008

ChemInform 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: The Influence of Gallium on the Magnetocaloric Properties of Gd5Si2Ge2.
Authors: Aksoy Seda , Yucel Atila , Elerman Yalcin , Krenke Thorsten , Acet Mehmet , Moya Xavier , Manosa Lluis
Published: September 2008

ChemInform 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: Magnetic and Electronic Properties of RCoxGe2 (R: Pr, Nd) Compounds.
Authors: Szytula A. , Penc B. , Kaczorowski D. , Arulraj A. , Baran S. , Stuesser N. , Tomala K.
Published: September 2008

ChemInform 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: Subsolidus Phase Relationships in the System ZnO—Li2O—WO3.
Authors: Lv Peiwen , chen Dagui , Li Wei , Xue Liping , Huang Feng , Liang Jingkui
Published: September 2008

ChemInform 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: Phase Equilibria and Crystal Structure of the Complex Oxides in the Sr—Fe—Co—O System.
Authors: Aksenova T. V. , Gavrilova L. Ya. , Cherepanov V. A.
Published: September 2008

ChemInform 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: Ordered Mesoporous BiVO4 Through Nanocasting: A Superior Visible Light‐Driven Photocatalyst.
Authors: Li Guisheng , Zhang Dieqing , Yu Jimmy C.
Published: September 2008

ChemInform 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 New Magnetically Ordered Polymorph of CuMoO4: Synthesis and Characterization of ε‐CuMoO4.
Authors: Baek Jaewook , Sefat Athena S. , Mandrus David , Halasyamani P. Shiv
Published: September 2008

ChemInform 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: o‐Benzenedisulfonimide as Reusable Broensted Acid Catalyst for Acid‐Catalyzed Organic Reactions.
Authors: Barbero Margherita , Cadamuro Silvano , Dughera Stefano , Venturello Paolo
Published: September 2008

ChemInform 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: Quinine‐Catalyzed Enantioselective Desymmetrization of meso‐Aziridines with Benzenethiols.
Authors: Wang Zhiyong , Sun Xiaoyu , Ye Shengqing , Wang Weizi , Wang Bing , Wu Jie
Published: September 2008

ChemInform 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: Planar Chiral Hydroxy Derivatives of [2.2]Paracyclophane as Auxiliaries for Asymmetric Allylboration.
Authors: Vorontsova N. V. , Zhuravsky R. P. , Sergeeva E. V. , Vorontsov E. V. , Starikova Z. A. , Rozenberg V. I.
Published: September 2008

ChemInform 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 Trifluoromethyl‐Substituted Pyrazoles and 1,2,4‐Triazines by Ring Transformation of Mesoionic 4‐Trifluoroacetyl‐1,3‐oxazolium‐5‐olates with Phenylhydrazine.
Authors: Kawase Masami , Koiwai Hiromi
Published: September 2008

ChemInform 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: Michael Addition of Dimedone with α,β‐Unsaturated Ketones: Synthesis of Quinoline and Chromene Derivatives.
Authors: Kendre Dhananjay B. , Toche Raghunath B. , Jachak Madhukar N.
Published: September 2008

ChemInform 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: An Efficient Radical Procedure for the Halogenation and Chalcogenation of B‐Alkylcatecholboranes.
Authors: Schaffner Arnaud‐Pierre , Montermini Florian , Pozzi Davide , Darmency Vincent , Scanlan Eoin Martin , Renaud Philippe
Published: September 2008

ChemInform 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: Expedient Method for Oxidation of Alcohol by Hydrogen Peroxide in the Presence of Amberlite IRA 400 Resin (Basic) as Phase‐Transfer Catalyst.
Authors: Bhati Nishi , Sarma Kuladip , Goswami Amrit
Published: September 2008

ChemInform 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: Iridium Catalysts with Chiral Imidazole‐Phosphine Ligands for Asymmetric Hydrogenation of Vinyl Fluorides and other Olefins.
Authors: Kaukoranta Paeivi , Engman Mattias , Hedberg Christian , Bergquist Jonas , Andersson Pher G.
Published: September 2008

ChemInform 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: Facile Nucleophilic Fluorination by Synergistic Effect Between Polymer‐Supported Ionic Liquid Catalyst and tert‐Alcohol Reaction Media System.
Authors: Kim Dong Wook , Jeong Hwan‐Jeong , Lim Seok Tae , Sohn Myung‐Hee , Chi Dae Yoon
Published: September 2008

ChemInform 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: CuI/L (L: Pyridine‐Functionalized 1,3‐Diketones) Catalyzed C—N Coupling Reactions of Aryl Halides with NH‐Containing Heterocycles.
Authors: Xi Zhenxing , Liu Fenghui , Zhou Yongbo , Chen Wanzhi
Published: September 2008

ChemInform 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: Sterically Hindered Mono(phosphines) as Supporting Ligands for the Platinum‐Catalyzed Hydroamination of Aminoalkenes.
Authors: Bender Christopher F. , Hudson William B. , Widenhoefer Ross A.
Published: September 2008

ChemInform 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.