bluuebunny/crossref_metadata_2025_split huggingface dataset:
Thermosensitive properties of amphiphilic N,N‐dimethylacrylamide gel grafted with thermosensitive oligo(N‐isopropylacrylamide)
Authors: Takahashi Atsushi , Sakohara Shuji 
Published: October 2011

AbstractIn this study, thermosensitive oligo(N‐isopropylacrylamide) [oligo(NIPAM)] chains were grafted to amphiphilic N,N‐dimethylacrylamide (DMAA) gel networks to form DMAA‐graft‐oligo(NIPAM) gels. The gels were prepared by copolymerizing oligo(NIPAM) macromonomers with DMAA. On heating, the gel caused structural changes in the gel network without causing a large volume change. The effects of the molecular weights and copolymerization ratios of oligo(NIPAM) on the temperature dependence of the swelling properties of the gel were investigated. Furthermore, to confirm the structural changes in the gel network, the temperature dependence of the diffusivity of rhodamine B through the gel membrane was investigated. Oligo(NIPAM) monomers with different molecular weights (Mn) of 2300, 7000, and 13,000 were prepared. The transition from hydrophilic to hydrophobic for oligo(NIPAM) of Mn 7000 and 13,000 was observed at about 32°C, while that of Mn 2300 was observed between 32 and 45°C. The gels grafted with oligo(NIPAM)s of Mn 7000 and 13,000 shrank above 32°C; in other words, thermosensitivity was clearly observed. On the other hand, the swelling behavior of the gel grafted with oligo(NIPAM) of Mn 2300 was similar to that of the DMAA gel; that is, negligible shrinkage of the gel was observed on heating. The diffusivity of rhodamine B through the gel membrane grafted with oligo(NIPAM) of Mn 2300 increased stepwise between 40 and 45°C. These results suggest that by selecting the molecular weights and copolymerization ratios of oligo(NIPAM), structural changes in the gel network occur without an overall volume change. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
Changes in structural characteristics of LLDPE functionalized with DEM using gamma‐irradiation
Authors: Perera R. , Albano C. , Sánchez Y. , Karam A. , Silva P. , Pastor J. M. 
Published: October 2011

AbstractThis work studies the structural changes produced by gamma‐radiation as a source of free radicals for functionalizing linear low‐density polyethylene (LLDPE) with diethyl maleate (DEM). The grafting of the DEM onto the LLDPE was carried out in solution using gamma‐rays from a 60Co source in air at room temperature, at a dose rate of 4.8 kGy/h and absorbed doses ranging from 15 to 400 kGy. The increase in the dose produced a higher concentration of free radicals and hence a higher grafting degree. The effects of DEM concentration are only perceptible at absorbed doses higher than 50 kGy. For a concentration of 30% DEM, the functionalization degrees ranged from 0.04 to 0.44 mol%. The use of gamma radiation modifies the structural and physical characteristics of the functionalized polyethylene with respect to the unmodified one, because, depending on the dose, the effects of gamma‐rays can lead to crosslinking of materials with decreased flowability. The effects of gamma‐radiation onto the molecular structure and molecular weight distribution of LLDPE are mitigated by the presence of DEM, due to the competition with the chain scission, branching and crosslinking reactions, for the consumption of the free radicals. The results provided by applying the successive self‐nucleation and annealing technique allow reaching an unequivocal conclusion: that the free radicals formed by gamma radiation for the DEM insertion and main chain modifications are preferentially generated in the secondary carbons of the more regular CH2 sequences. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
Excited‐State Dynamics of CS2 Studied by Photoelectron Imaging with a Time Resolution of 22 fs
Authors: Fuji Takao , Suzuki Yoshi‐Ichi , Horio Takuya , Suzuki Toshinori 
Published: October 2011

AbstractThe ultrafast dynamics of CS2 in the 1B2(1Σu+) state was studied by photoelectron imaging with a time resolution of 22 fs. The photoelectron signal intensity exhibited clear vibrational quantum beats due to wave packet motion. The signal intensity decayed with a lifetime of about 400 fs. This decay was preceded by a lag of around 30 fs, which was considered to correspond to the time for a vibrational wave packet to propagate from the Franck–Condon region to the region where predissociation occurred. The photoelectron angular distribution remained constant when the pump–probe delay time was varied. Consequently, variation of the electronic character caused by the vibrational wave packet motion was not identified within the accuracy of our measurements.
Degradation of Target Oligosaccharides by Anthraquinone–Lectin Hybrids with Light Switching
Authors: Imai Yukari , Hirono Shingo , Matsuba Haruka , Suzuki Tomohiro , Kobayashi Yuka , Kawagishi Hirokazu , Takahashi Daisuke , Toshima Kazunobu 
Published: October 2011

AbstractAnthraquinone–lectin hybrids were effectively synthesized using water‐soluble anthraquinone derivative 11 with concanavalin A (ConA) and hygrophorus russula lectin (HRL) to give anthraquinone–ConA (16) and anthraquinone–HRL (17) hybrids, respectively. These anthraquinone–lectin hybrids effectively and selectively degraded oligosaccharides containing a mannose residue as a non‐reducing terminal sugar, which has affinity for ConA and HRL, under photo‐irradiation with long‐wavelength UV light without additives and under neutral conditions. In addition, anthraquinone–HRL (17) selectively photo‐degraded only Man(α1,6)Man, which has a high affinity for HRL, among several mannosides by recognition of both the type and glycosidic linkage profile of the sugar in an oligosaccharide.
Evaluation of a Fluorescent Derivative of AMD3100 and its Interaction with the CXCR4 Chemokine Receptor
Authors: Knight James C. , Hallett Andrew J. , Brancale Andrea , Paisey Stephen J. , Clarkson Richard W. E. , Edwards Peter G. 
Published: October 2011

AbstractAMD3100 is a potent and selective antagonist of the CXCR4 receptor; it has been shown to block the route of entry of HIV into host T‐cells. This compound and its analogues have since been found to act as haematopoietic stem cell mobilisation agents and, more recently, as anti‐cancer agents. Here, we have examined a fluorescent derivative of AMD3100, L1, which offered the potential to assess the behaviour of AMD3100 at the cell surface by using optical imaging modalities. The binuclear ZnII, CuII and NiII complexes of L1 have also been investigated as these metals have been previously shown to enhance the binding properties of AMD3100. Furthermore, ZnII and CuII are known to enhance and quench, respectively, the fluorescence of similar anthracenyl‐based ligands. Whilst L1 demonstrates an ability to inhibit the binding of the anti‐CXCR4 monoclonal antibody 12G5 (IC50=0.25–0.9 μM), the incorporation of an anthracenyl moiety resulted in a significantly reduced affinity for CXCR4 compared to AMD3100 (IC50=10 nM). We observed no significant increase in fluorescence intensity following incubation with murine pre‐B cells overexpressing CXCR4 compared to a control cell line. This limits the usefulness of L1 as a fluorescent imaging probe. Interestingly, the ZnII complex, which carries an overall +4 charge, revealed marginally higher specificity and reduced toxicity in vitro compared to the free ligand, albeit with reduced affinity for CXCR4 (IC50=1.8‐5 μM). We suggest that the incorporation of an anthracenyl group contributes to the lipophilic character of the free ligand, thereby resulting in transport across the plasma membrane. This effect is seemingly diminished when the ligand is complexed to charged metal ions.
ChemInform Abstract: CsTe2O6‐x: Novel Mixed‐Valence Tellurium Oxides with Framework‐Deficient Pyrochlore‐Related Structure.
Authors: Siritanon Theeranun , Li Jun , Stalick Judith K. , Macaluso Robin T. , Sleight Arthur W. , Subramanian M. A. 
Published: October 2011

AbstractThe title phases with x = 0.25—1.15 are synthesized from appropriate amounts of CsTe2O6 (prepared by heating a stoichiometric mixture of CsNO3 and TeO2 in air at 600 °C for 12 h) and CsTe2O4.5 (obtained from Cs2CO3 and TeO2 at 500 °C for 12 h under Ar) at 500 °C for 12 h.
ChemInform Abstract: Neutron and X‐Ray Diffraction Study of Pyrophosphate‐Based Li2‐xMP2O7 (M: Fe, Co) for Lithium Rechargeable Battery Electrodes.
Authors: Kim Hyungsub , Lee Seongsu , Park Young‐Uk , Kim Haegyeom , Kim Jongsoon , Jeon Seokwoo , Kang Kisuk 
Published: October 2011

AbstractThe title compounds are structurally characterized by neutron and X‐ray diffraction to elucidate structural information and structural changes during electrochemical reactions.
ChemInform Abstract: A New Semimagnetic Compound: Cd1‐xFexIn2S4 Single Crystal Grown by CVT.
Authors: Attolini G. , Frigeri C. , Sagredo V. , Solzi M. , Delgado G. 
Published: October 2011

AbstractSingle crystals of the title compounds with x = 0.25, 0.5, and 0.75 are prepared from the elements by the chemical vapor transport method using iodine as transporting agent (850→800 °C).
ChemInform Abstract: Catalytic Mechanism of Water Oxidation with Single‐Site Ruthenium—Heteropolytungstate Complexes.
Authors: Murakami Masato , Hong Dachao , Suenobu Tomoyoshi , Yamaguchi Satoru , Ogura Takashi , Fukuzumi Shunichi 
Published: October 2011

AbstractCs5[Ru(H2O)SiW11O39] (I) and Cs5[Ru(H2O)GeW11O39] (II) are robust catalysts for water oxidation to generate oxygen with (NH4)2[Ce(NO3)6] (III) as a one‐electron oxidant in water.
ChemInform Abstract: Oxidative Cleavage of the Carbon—Carbon σ‐Bond Using Reusable Copper on Iron.
Authors: Song Ren‐Jie , Liu Yu , Hu Rui‐Xiang , Liu Yan‐Yun , Wu Ji‐Cheng , Yang Xu‐Heng , Li Jin‐Heng 
Published: October 2011

AbstractThe new catalyst displays high activity (maximal TON of up to 51.000) and allows a large‐scale reaction (2.25 g substrate).
ChemInform Abstract: Biomimetic Cationic Polyannulation Reaction Catalyzed by Bi(OTf)3: Cyclization of 1,6‐Dienes, 1,6,10‐Trienes, and Aryl Polyenes.
Authors: Godeau Julien , Olivero Sandra , Antoniotti Sylvain , Dunach Elisabet 
Published: October 2011

AbstractThe reaction opens a route to construct bi‐ to tetracyclic compounds in one‐pot manner from readily available polyunsaturated precursors.
ChemInform Abstract: Cobalt‐Catalyzed Benzylic C—H Amination via Dehydrogenative‐Coupling Reaction.
Authors: Ye Yang‐Hong , Zhang Ji , Wang Gao , Chen Shan‐Yong , Yu Xiao‐Qi 
Published: October 2011

AbstractIn the presence of the inexpensive catalyst/oxidant system, benzylic compounds are aminated smoothly by sulfonamides, carboxamides and carbamates.
ChemInform Abstract: Ruthenium‐Catalyzed Hydrovinylation of N‐Acetylenamines Leading to Amines with a Quaternary Carbon Center.
Authors: Wang Qiu‐Shi , Xie Jian‐Hua , Li Wei , Zhu Shou‐Fei , Wang Li‐Xin , Zhou Qi‐Lin 
Published: October 2011

AbstractConjugate hydrovinylation takes place if the enamine substrate has a vinyl group at the α‐position [cf.
ChemInform Abstract: Knoevenagel Condensation Catalyzed by a Tertiary‐Amine Functionalized Polyacrylonitrile Fiber.
Authors: Li Guowei , Xiao Jia , Zhang Wenqin 
Published: October 2011

AbstractThe catalyst is prepared by aminating polyacrylonitrile fiber with N,N‐dimethyl‐1,3‐propanediamine.
ChemInform Abstract: Palladium(II)‐N‐heterocyclic Carbene Complex Derived from Proline Towards Suzuki—Miyaura Coupling Reaction in Water at Room Temperature.
Authors: Tang Yi‐Qiang , Lv Huan , Lu Jian‐Mei , Shao Li‐Xiong 
Published: October 2011

AbstractThe reaction is applied to aromatic bromides and iodides and arylboronic acids.
ChemInform Abstract: Green Synthesis of Fluorinated Biaryl Derivatives via Thermoregulated Ligand/Palladium‐Catalyzed Suzuki Reaction.
Authors: Liu Ning , Liu Chun , Jin Zilin 
Published: October 2011

AbstractA variety of target compounds including fluorinated liquid crystals (III) is prepared using a thermoregulated ligand/palladium catalyst and water as a sole medium.
ChemInform Abstract: One‐Step Entry to P,O‐ and P,N‐Type Heterocyclic Tertiary Phosphine Ligands and Application in Suzuki—Miyaura Cross‐Coupling Reactions.
Authors: Ullah Ehsan , McNulty James , Kennedy Christine , Robertson Al 
Published: October 2011

AbstractFuranylphosphine ligand FPL is efficiently used for the coupling of various aryl iodides and bromides with phenylboronic acid (II), low yields are observed for aryl chlorides.
ChemInform Abstract: Selenoether Ligand Assisted Heck Catalysis.
Authors: Chakraborty Tapash , Srivastava Kriti , Singh Harkesh B. , Butcher Ray J. 
Published: October 2011

AbstractThe reaction of aryl bromides with butyl acrylate or styrene is catalyzed effectively by the catalyst, generated in situ from (I) and PdCl2, or by the pre‐made catalysts (II) or (III).
ChemInform Abstract: Application of Dimeric Cyclopalladated Complex of Tribenzylamine as an Efficient Catalyst in the Heck Cross‐Coupling Reaction.
Authors: Hajipour Abdol R. , Rafiee Fatemeh 
Published: October 2011

AbstractThe reaction is applied to a variety of aryl bromides, iodides, chlorides and arenesulfonyl chlorides.
ChemInform Abstract: Highly Regio‐ and Diastereoselective Construction of Spirocyclopenteneoxindoles Through Phosphine‐Catalyzed [3 + 2] Annulation of Morita—Baylis—Hillman Carbonates with Isatylidene Malononitriles.
Authors: Deng Hong‐Ping , Wei Yin , Shi Min 
Published: October 2011

AbstractThe reaction proceeds with good to excellent diastereoselectivity according to A) or slight variations [cf.
ChemInform Abstract: Nickel(0)‐Catalyzed Cyclization of N‐Benzoylaminals for Isoindolinone Synthesis.
Authors: Shacklady‐McAtee Danielle M. , Dasgupta Srimoyee , Watson Mary P. 
Published: October 2011

AbstractA variety of target compounds is prepared in the presence of MgBr2·Et2O or AlMe3.
ChemInform Abstract: 3‐Substituted Indoles: One‐Pot Synthesis and Evaluation of Anticancer and Src Kinase Inhibitory Activities.
Authors: Rao V. Kameshwara , Chhikara Bhupender S. , Shirazi Amir Nasrolahi , Tiwari Rakesh , Parang Keykavous , Kumar Anil 
Published: October 2011

AbstractAn ecofriendly and economical method for the synthesis of 3‐substituted indoles (IV) (18 examples) via one‐pot three‐component coupling reaction of various benzaldehydes, N‐methylaniline, and indoles using Yb(OTf)3‐SiO2 as catalyst is presented.
ChemInform Abstract: Divergent Reactivity of α‐Oximino Carbenoids: Facile Access to 2‐Isoxazolines and 2H‐Azirines.
Authors: Qi Xinxin , Jiang Yaojia , Park Cheol‐Min 
Published: October 2011

Abstractα‐Oximino diazo compounds such as (I), (IV) and (VII) can serve as carbenoid precursors furnishing access to 2‐isoxazolines and 2H‐azirines under rhodium catalysis.
ChemInform Abstract: ReCl(CO)5‐Catalyzed Cyclocondensation of Phenols with 2‐Methyl‐3‐butyn‐2‐ol to Afford 2,2‐Dimethyl‐2H‐chromenes.
Authors: Zeng Hanxiang , Ju Jia , Hua Ruimao 
Published: October 2011

AbstractThe reaction of various phenol substrates under mild conditions in the presence of the recoverable rhenium catalyst with title alcohol (II) and analogues (X) allows a direct preparation of substituted chromene structures as important substructures.
ChemInform Abstract: Solvent‐Free One‐Pot Synthesis, Characterization, Antibacterial and Antifungal Activities of Novel Spiropiperidinyl‐1,2,4‐triazolidine‐3‐thiones.
Authors: Kanagarajan V. , Thanusu J. , Ezhilarasi M. R. , Gopalakrishnan M. 
Published: October 2011

AbstractAll the synthesized compounds exhibit strong antifungal activities.
ChemInform Abstract: Synthesis and Cycloaddition Reactions of Sulfur‐Substituted Quinolizidine Dienes.
Authors: Chou Shang‐Shing P. , Huang Chien‐Wen , Chang Chih‐Chun 
Published: October 2011

AbstractThe title compounds are obtained via ring‐closing metathesis of the corresponding enynes.
ChemInform Abstract: Synthesis of 5‐Alkynyl‐2,2,6‐trimethyl‐1,3‐dioxin‐4‐ones and 1,4‐Disubstituted‐1,2,3‐triazoles.
Authors: Stefani Helio A. , Vieira Adriano S. , Amaral Monica F. Z. J. , Cooper Leora 
Published: October 2011

AbstractOptimized conditions are applied to the Suzuki—Miyaura cross‐coupling of potassium alkynyl trifluoroborates with the iodinated 1,3‐dioxin‐4‐one (I).
ChemInform Abstract: Synthesis and Pharmacological Activities of Some Dibenzopyrazolocinnolines and Dibenzopyridazinoquinoxalines.
Authors: Amer A. M. , El‐Farargy A. F. , Yousif N. M. , Fayed A. A. 
Published: October 2011

AbstractA variety of new polycyclic N‐heterocycles are synthesized from aminopyrazolocinnoline derivative (I) or pyridazine (XIV) and evaluated for their antiparkinsonian activities.
ChemInform Abstract: Microwave‐Assisted Multicomponent Reaction in Water Leading to Highly Regioselective Formation of Benzo[f]azulen‐1‐ones.
Authors: Wang Shu‐Liang , Cheng Chuang , Wu Fei‐Yue , Jiang Bo , Shi Feng , Tu Shu‐Jiang , Rajale Trideep , Li Guigen 
Published: October 2011

AbstractA total of 38 examples is synthesized by the new green three‐component method.
ChemInform Abstract: Chemoselective Suzuki Coupling of Diborylmethane for Facile Synthesis of Benzylboronates.
Authors: Endo Kohei , Ohkubo Takahiro , Shibata Takanori 
Published: October 2011

AbstractThe key is the use of an equimolar amount of KOH and diborylmethane (II).
ChemInform Abstract: Manganese(III)‐Mediated Phosphinoyl Radical Reactions for Stereoselective Synthesis of Phosphinoylated Tetrahydronaphthalenes.
Authors: Pan Xiang‐Qiang , Wang Lu , Zou Jian‐Ping , Zhang Wei 
Published: October 2011

Abstract2‐Phosphino‐tetrahydronaphthalenes are obtained via a trans‐selective phosphinoyl radical addition and cascade cyclization of aryl pentenoates and arylethylene styrenes.
ChemInform Abstract: Iridium‐Catalyzed Condensation of Alcohols and Amines as a Method for Aminosugar Synthesis.
Authors: Cumpstey Ian , Agrawal Santosh , Borbas K. Eszter , Martin‐Matute Belen 
Published: October 2011

AbstractPrimary carbohydrate amines are alkylated by primary alcohols in the presence of an iridium catalyst.
Solar Thermal Power Plants – Key Elements for the DESERTEC Vision
Authors: Pitz‐Paal Robert , Lüpfert Eckhard 
Published: October 2011

AbstractGroße, präzise gebogene Spiegelflächen und enorme Wärmespeichertanks sind die auffälligsten Komponenten eines Kraftwerkstyps, der sich gerade in den Wüstenregionen der Welt in rasant ausbreitet. Um die entstehenden hohen Temperaturen zum Kraftwerksbetrieb zu nutzen, wird eine passend dimensionierte Anlage für Übertragung, Transport, Speicherung und effiziente Nutzung der Wärme benötigt. Das Ergebnis ist ein Kraftwerk, dessen Kraftstoff die Sonne liefert. 200 bis 250 L Öl entsprechen dem jährlichen Erntepotenzial auf jedem Quadratmeter Wüste und durch Wärmespeicherung und Wettervorhersagen ist die Stromeinspeisung solarthermischer Kraftwerke gut planbar. Sinkende Investitionskosten und große Wertschöpfungsanteile am Standort der Anlage sind die Basis für gesellschaftliche Akzeptanz und ökonomische Attraktivität.
Geothermal Electricity Generation in Germany
Authors: Eggeling Lena , Kölbel Thomas , Schlagermann Pascal , Münch Wolfram 
Published: October 2011

AbstractDer Geothermie als CO2‐freier und heimischer Energiequelle kommt aufgrund ihrer hohen Verfügbarkeit im künftigen Energiemix eine besondere Rolle zu. Allein Deutschland verfügt mit seinen drei Geothermieregionen – Norddeutsches Becken, Oberrheingraben und Bayrisches Molassebecken – über ein geothermisches Gesamtpotenzial von etwa 33,3 · 104 TWh. Dass sich die Technologie bereits in der Praxis bewährt hat, zeigen nicht zuletzt die bestehenden Geothermiekraftwerke. Aus der bisherigen Entwicklung geht zudem hervor, dass die heutigen Gestehungskosten künftig weiter reduziert werden können. Eine wirtschaftliche Nutzung der Erdwärme zur Stromerzeugung ist unter den Maßgaben des Erneuerbaren Energien Gesetzes auch in Niederenthalpie‐Gebieten wie Deutschland absehbar.
The Role of Naturally Occurring River Biofilms on the Degradation Kinetics of Diazinon
Authors: Tien Chien‐Jung , Chuang Tzu‐Liang , Chen Colin S. 
Published: October 2011

AbstractRiver biofilms are dominant riverine biota with diverse microorganisms. They have been found to contribute greatly to river self‐purification for removal of nutrients and organic matter. This study intended to investigate the ability of naturally occurring river biofilms with changing seasons for the removal of the organophosphorus pesticide diazinon. Natural river biofilms from spring showed higher ability to remove diazinon (99.9% removal) than those from winter (77%) with light exposure. In contrast to control sets without biofilms under irradiation, 27% of diazinon removal in spring and 22% in winter may result from microbial activity within biofilms. Removal of diazinon by river biofilms could be attributed mostly to degradation due to low sorption capacity of biofilms. Spring biofilms had higher dissipation rates (0.265 and 0.486 d−1 for biofilms with different growth periods) than winter ones (0.099 and 0.119 d−1) according to first order model. Higher ability of diazinon removal by spring biofilms may be explained by their higher bacterial and algal biomass comparing to winter biofilms. Naturally occurring river biofilms played a significant role in degradation of diazinon, particularly for those grown in spring. Their potential for use in the treatment of diazinon‐contaminated water has been demonstrated.
A CMOS multichannel electrical stimulation prototype system
Authors: Gong Cihun‐Siyong Alex , Yao Kai‐Wen , Shiue Muh‐Tian 
Published: October 2011

SUMMARYWe developed an inductively powered integrated electronic prosthesis, allowing for the trade‐offs among implant functionality, circuit complexity, power consumption, hardware cost, and integrity of data recovery, for a multichannel microstimulation circuitry. The proposed prosthesis features energy efficiency and is capable of up to 40 scan/s with 240 stimulus channels in mode I and three times resolution at the same scan rate in mode II under a carrier frequency of 2 MHz. In order to satisfy future upgrade demands, the prototype has been constructed with a 16‐channel‐based stimulation scheme so that the spatial resolution of the design can be extended toward various experimental purposes. The circuit techniques used in the system are detailed. Results from fabricated chips using a 0.18‐µm CMOS process are given as proof of concept. Copyright © 2011 John Wiley & Sons, Ltd.
A Concise Stereoselective Synthesis of the Tetracyclic Naphthoquinone (–)‐Isagarin
Authors: Fernandes Rodney A. , Ingle Arun B. 
Published: October 2011

AbstractA concise stereoselective synthesis of the tetracyclic naphthoquinone natural product (–)‐isagarin has been completed in seven steps from known alkyne 5 (obtained from D‐mannitol) by using Dötz benzannulation and intramolecular stereospecific dioxabicyclic ketal formation as key steps.