bluuebunny/crossref_metadata_2025_split huggingface dataset:
Hydraulischer Grundbruch: neue Erkenntnisse
Authors: Odenwald Bernhard , Herten Markus 
Published: September 2008

AbstractDer Beitrag beinhaltet die Ergebnisse von Untersuchungen zum Nachweis gegen hydraulischen Grundbruch bei unterströmten, relativ gering in den Untergrund einbindenden Wänden mit baugrubenseitigem Auflastfilter. Auf Grundlage von numerischen Grundwasserströmungsberechnungen wird dargestellt, dass sich in diesem Fall unterhalb des Wandfußes signifikante, vertikale Strömungsanteile ergeben, die beim Nachweis gegen hydraulischen Grundbruch berücksichtigt werden müssen. Zur Ermittlung der erforderlichen Höhe des Auflastfilters in Abhängigkeit vom Wandabstand wird ein auf der Strömungsberechnung basierendes Verfahren vorgestellt und mit den bisher verwendeten Berechnungsansätzen verglichen. Weiterhin wird die Berücksichtigung von Sicherheiten nach DIN 1054 sowie von Reibungskräften innerhalb des Auflastfilters auf Grundlage dieses Verfahrens erläutert.
Sanierung der Felseremitage Bretzenheim a.d. Nahe
Authors: Jahnel Christian , Meier Jürgen , Sachtleben Volker 
Published: September 2008

AbstractDie Felseremitage in Bretzenheim/Nahe liegt ca. 5 km nördlich von Bad Kreuznach am südlichen Talhang des Guldenbachtals. Seit den 60‐er Jahren des vorigen Jahrhunderts wurde an dem historischen Bauwerk eine fortschreitende Standsicherheitsgefährdung durch Verwitterungsprozesse und Bewegungen von Großkluftkörpern beobachtet. Die erforderliche Sanierung erfolgte durch Verankerung mit vorgespannten Dauerankern im Jahre 1997. An der Sanierungsplanung hat der Arbeitskreis “Geotechnik historischer Bauwerke und Naturdenkmäler” der Deutschen Gesellschaft für Geotechnik beratend mitgewirkt. Mittels Verformungsmessungen wurden die Sanierungsmaßnahmen bis in das Jahr 2007 kontrolliert.
A novel biosensor for bovine serum albumin based on fluorescent self‐assembled sandwich bilayers
Authors: Sun Xiangying , Liu Bin , He Fei 
Published: September 2008

AbstractFluorescent dyes butyl rhodamine B were assembled via a dl‐cystenine intermediate onto quartz wafers whose surface had first adsorbed gold nanoparticles. Hence self‐assembled sandwich bilayers with nanocomposite structure were constructed which can be used as a biosensor for bovine serum albumin. The biosensor‐based self‐assembled monolayers (SAMs) are regenerable and have high sensitivity, five orders of magnitude higher than that of bulk solution phase sensing. The effects of existing forms of dyes on the fluorescence spectra of bilayers in the presence of bovine serum albumin were investigated. Copyright © 2008 John Wiley & Sons, Ltd.
Study of the enhancement of a new chemiluminescence reaction and its application to determination of β‐lactam antibiotics
Authors: Sorouraddin M. H. , Iranifam M. , Imani‐Nabiyyi A. 
Published: September 2008

AbstractAn enhanced thiosemicarbazide(TSC)–H2O2 chemiluminescence (CL) system was established and proposed as a new analytical method for determination of β‐lactam antibiotics, ampicillin sodium and amoxicillin at microgram levels. The method is based on the inhibition of CL emission accompanying oxidation of TSC by H2O2 in alkaline medium. The effect of anionic, cationic, and non‐ionic surfactants on the CL emission of the system was studied. Both N‐cetyl‐N,N,N‐trimethylammonium bromide (CTMAB) and Triton X‐100, unlike sodium dodecyl sulfate (SDS), reinforced the CL intensity and were efficient to approximately the same level. The effect of the presence of eight non‐aqueous solvents on the CL system was also investigated. Upon addition of both of the non‐ionic surfactant, Triton X‐100, and the non‐aqueous solvent, N,N‐dimethyl formamide (DMF), the intensity of the CL reaction was increased 100‐fold. This method allows the measurement of 25–545 µg amoxicillin, and 35–350 µg ampicillin sodium. The detection limits are 8 µg for amoxicillin and 9 µg for ampicillin sodium. The relative standard deviations of six replicate measurements of 200 µg amoxicillin and 200 µg ampicillin sodium were 1.9 and 2.1%, respectively. The effect of foreign species on the determination of amoxicillin and ampicillin sodium was also examined. The proposed method was successfully applied to the determination of ampicillin sodium and amoxicillin in some pharmaceutical dosage forms. Copyright © 2008 John Wiley & Sons, Ltd.
Oxidation of methionine residue at hydrophobic core destabilizes p53 tetrameric structure
Authors: Nomura Takao , Kamada Rui , Ito Issaku , Chuman Yoshiro , Shimohigashi Yasuyuki , Sakaguchi Kazuyasu 
Published: September 2008

AbstractThe tumor suppressor protein p53 is a tetrameric phosphoprotein that induces cell cycle, development, and differentiation by regulating the expression of target genes. The tetramerization of p53 is essential for its tumor suppressor functions. It has been known that oxidation of proteins affects their structure and function. A methionine residue (Met340) is located at the hydrophobic core in p53 tetramerization domain. Here, we demonstrated that Met340 residue can be oxidized to methionine sulfoxide under oxidative conditions and investigated effects of the oxidation of p53 tetramerization domain on its stability and oligomerization state by CD measurement and gel filtration. The oxidation of Met340 drastically induced destabilization of the p53 tetramer by 22.8 kJ/mol of ΔΔGTm, while retaining the identical conformation as that of the wild‐type peptide. Trypsin digestion experiments also showed that oxidation of Met340 allowed the peptide to form locally loose structure and become more sensitive to enzyme degradation. The tetrameric structure may be destabilized because the oxidation of Met340 induces charge repulsion and/or steric hindrance between the sulfoxide groups. These results taken together suggested that oxidation of methionine residues in the p53 protein might be one of the inactivation mechanisms of p53 transcriptional function under conditions of oxidative stress. © 2008 Wiley Periodicals, Inc. Biopolymers 91: 78–84, 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
Betaine structure and the presence of hydroxyl groups alters the effects on DNA melting temperatures
Authors: Vasudevamurthy Madhusudan K. , Lever Michael , George Peter M. , Morison Ken R. 
Published: September 2008

AbstractBetaine lowers the melting temperature of deoxyribonucleic acid (DNA) and decreases its dependence on base composition. The effects of synthetic betaine analogs on the melting of DNA samples with different GC content were measured. Since many polyhydroxy compounds also lower DNA melting temperatures, hydroxyl‐substituted betaine analogs were included. Some synthetic sulfonate analogs of betaine lowered the DNA melting temperatures by twice as much at the same molar concentration. They were up to twice as effective at decreasing the base pair dependence. Some carboxylate homologs of betaine, substituted with hydroxyl groups, increased the melting temperature. This effect was greater with low GC content DNA. Sulfonate analogs of betaine with hydroxyl groups usually destabilize the DNA, while their carboxylate analogs stabilize the DNA. Distances between the charges of these synthetic zwitterionic solutes influence the effect on DNA, with the optimum separation being two or three methylene groups. A betaine with two hydroxyl groups on one N‐alkyl group had a greater effect than an isomer with two hydroxyl groups on separate N‐alkyl substituents. We suggest that the effect of these solutes depends on structuring the hydration water of DNA, as well as interactions with the DNA structure itself. © 2008 Wiley Periodicals, Inc. Biopolymers 91: 85–94, 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
Presentations of psychosis with violence: variations in different jurisdictions. A comparison of patients with psychosis in the high security hospitals of Scotland and England
Authors: Taylor Pamela J. , Hill Jon , Bhagwagar Zubin , Darjee Rajan , Thomson Lindsay D. G. 
Published: September 2008

AbstractBackgroundInternational literature is consistent on there being a significant relationship between psychosis and violence, less so on its extent and nature, but two main presentational types are increasingly recognized. In one, people are unremarkable before onset of illness and psychotic symptoms commonly drive violence; in the other, psychosis is preceded by childhood conduct problems, associated with personality disorder, and psychotic symptoms seem less relevant.AimsTo explore the extent to which variations in aspects of social and service context in different jurisdictions affect presentational type among people admitted to high security hospitals.HypothesesThere will be differences between jurisdictions in proportions of patients with pure psychosis or with psychosis and antecedent personality disorder, but symptom drive to violence will be more common in the pure psychosis group regardless of social, legal and service context.MethodIndependently conducted record studies were used to compare high security hospital patients with psychosis in Scotland and England, all resident between 25 August 1992 and 13 August 1993.ResultsThe cohorts were similar in offence histories, predominance of schizophrenia, age at first hospitalization for psychosis and first high security hospitalization. More Scottish patients had co‐morbid substance misuse diagnoses and/or personality disorder than patients in England. Psychotic symptom drive to the index offence was, however, four times more likely in the pure psychosis groups, regardless of sex, ethnic group or country. Scottish patients spent less time in high security after the index act.ConclusionsOur hypotheses were sustained. Knowledge about lifestyle before onset of psychosis is important for interpreting literature on how psychotic symptoms relate to violence. This may also influence longer term outcome, although the shorter length of secure hospital stay in Scotland was perhaps affected more by greater availability of open ‘step‐down’ beds. Copyright © 2008 John Wiley & Sons, Ltd.
The Role of Crystallization Parameters for the Synthesis of Germanosilicate with UTL Topology
Authors: Shvets Oleksiy V. , Zukal Arnošt , Kasian Natalia , Žilková Naděžda , Čejka Jiří 
Published: September 2008

AbstractThe investigation of the critical synthesis parameters of germanosilicate of UTL topology, possessing 14‐ and 12‐rings, has been carried out in detail. (6R,10S)‐6,10‐Dimethyl‐5‐azoniaspiro[4.5]decane hydroxide was used as the structure‐directing agent (SDA). The kinetics of the synthesis, the role of the Si/Ge ratio in the synthesis mixture, and the effect of the calcination procedure were investigated in relation to the crystallinity and textural properties of the synthesized material. The optimum synthesis time was found to be six days for Si/Ge and (Si+Ge)/SDA molar ratios of 2 and 1.7, respectively. The UTL zeolite crystallizes as small sheets of 10 μm in size. The micropore volume of the best crystals is 0.22 cm3 g−1 with a micropore diameter of 1.05 nm, based on DFT and Saito–Foley analyses of adsorption data.
Reactivity of the 4‐Amino‐5H‐1,2‐Oxathiole‐2,2‐Dioxide Heterocyclic System: A Combined Experimental and Theoretical Study
Authors: de Castro Sonia , Peromingo M. Teresa , Lozano Angel E. , Camarasa María‐José , Velázquez Sonsoles 
Published: September 2008

AbstractThe reactivity of the 4‐amino‐5H‐1,2‐oxathiole‐2,2‐dioxide (or β‐amino‐γ‐sultone) heterocyclic system has scarcely been studied. Here we describe the reactivity of this system towards electrophiles and amines on readily available model substrates differently substituted at the C‐5 position. A variety of C‐electrophiles, carbonyl electrophiles (such as acyl chlorides, isocyanates, or aldehydes) and halogen or nitrogen electrophiles have been explored. Both the C‐3 and 4‐amino positions of the β‐amino‐γ‐sultone system are able to undergo electrophilic reactions, and the reaction products depend on the electrophile used and on the reaction conditions. On the other hand, nucleophilic attack of amines occurs at the C‐4 position of the β‐amino‐γ‐sultone system only in spiranic substrates bearing alicyclic substituents at the C‐5 position. A comparative computational study between spiranic and non‐spiranic substrates suggests that conformational changes, undergone on intermediate compounds, account for the observed reactivity differences. Moreover, these conformational changes seem to bring about an increase of electron density on the N‐4 and C‐3 atoms of the enaminic system, and a possible enhancement in the reactivity of spiranic substrates towards electrophiles in the presence of amines. Experimental data consistent with this predicted enhanced reactivity is also presented.
Synthesis of Substituted Phenols by Using the Ring‐Closing Metathesis/Isoaromatization Approach
Authors: Yoshida Kazuhiro , Narui Rintaro , Imamoto Tsuneo 
Published: September 2008

AbstractRing‐closing olefin metathesis (RCM) of 4‐methylene‐1,7‐octadien‐3‐ones 2, followed by isomerization of the carboncarbon double bond of 6‐methylene‐2‐cyclohexenones 3 from exo to endo, produced various phenols 4. As an application of the method, the RCM/Mizoroki–Heck reaction of 2 was proven to be also effective for the synthesis of phenols having an additional substituent at ortho‐benzylic position.
Counterion Effect on the Spin‐Transition Properties of the Cation [Fe(btzx)3]2+ (btzx=m‐Xylylenebis(tetrazole))
Authors: Quesada Manuel , Prins Ferry , Bill Eckhard , Kooijman Huub , Gamez Patrick , Roubeau Olivier , Spek Anthony L. , Haasnoot Jaap G. , Reedijk Jan 
Published: September 2008

AbstractThe influence of the counteranion on the structure and the spin‐transition properties of original 1D bis(tetrazole) FeII systems, namely [Fe(btzx)3]X2 (X=PF6− (1), CF3SO3− (2) and ClO4− (3); btzx=m‐xylylenebis(tetrazole)) is studied. The X‐ray crystal structures of compounds 1 and 2 are described in detail. These structures present a solvent molecule encapsulated within pockets formed by btzx ligands along the 1D coordination chains. Compound 2 is shown to be the first structurally characterised alternating HS–LS 1D spin‐transition system (HS=high spin, LS=low spin). The magnetic susceptibility measurements of all three compounds are compared. The degree of completion and the transition temperature are both drastically influenced by the counterion used, while surprisingly, the cooperative nature of the transition is not affected by the choice of counterion. Compounds 1 and 2 are further studied by Mössbauer spectroscopy and their distinct LIESST properties are compared.
Self‐Assembly of Alkyl‐Substituted Cubic Siloxane Cages into Ordered Hybrid Materials
Authors: Shimojima Atsushi , Goto Ryota , Atsumi Norimasa , Kuroda Kazuyuki 
Published: September 2008

AbstractSiloxane‐organic hybrids with well‐ordered mesostructures were synthesized through the self‐assembly of novel amphiphilic molecules that consist of cubic siloxane heads and hydrophobic alkyl tails. The monoalkyl precursors functionalized with ethoxy groups (CnH2n+1Si8O12(OEt)7, 1 Cn, n=16, 18, and 20) were hydrolyzed under acidic conditions with the retention of the siloxane cages, leading to the formation of two‐dimensional hexagonal phases by evaporation‐induced self‐assembly processes. Analysis of the solid‐state 29Si MAS NMR spectra of these hybrid mesostructures confirmed that the cubic siloxane units were cross‐linked to form siloxane networks. Calcination of these hybrids gave mesoporous silica, the pore diameter of which varied depending on the alkyl‐chain length. We also found that the precursors that had two alkyl chains formed lamellar phases, thus confirming that the number of alkyl chains per cage had a strong influence on the mesostructures. These results expand the design possibility of novel nanohybrid and nanoporous materials through the self‐assembly of well‐defined oligosiloxane‐based precursors.
Elusive Trimethyllanthanum: Snapshots of Extensive Methyl Group Degradation in LaAl Heterobimetallic Complexes
Authors: Gerber Laura C. H. , Le Roux Erwan , Törnroos Karl W. , Anwander Reiner 
Published: September 2008

AbstractReactions of [La(AlMe4)3] and [Y(AlMe4)3] with PMe3 show that the phosphine can cleave LnCH3Al linkages, separating Me3Al(PMe3). PMe3 (3 mol equiv) reacts with [Y(AlMe4)3] to give [(YMe3)n] contaminated with by‐products containing phosphorus and aluminum. The La‐based analog, [(LaMe3)n], is not formed selectively from the reaction of [La(AlMe4)3] with PMe3 or Et2O, which rather yields insoluble La/Al heterobimetallic products. Three multi‐nuclear La‐based clusters were obtained from a reaction of [La(AlMe4)3] with PMe3 (1 equiv) and identified by X‐ray structure analyses. Each cluster exhibits extensive methyl group degradation and contains methylene, methine, or carbide moieties. [La4Al8(CH)4(CH2)2(CH3)20(PMe3)] has a {La4(CH)4} cuboid core supported by AlMe3, Me2AlCH2AlMe2, and PMe3 ligands. [La4Al8(C)(CH)2(CH2)2(CH3)22(toluene)] also contains a cuboid core, {La3Al(C)(CH)2(CH2)}, which includes one exo cubic lanthanum atom, and is supported by AlMe3, Me3AlCH2AlMe2, (AlMe4)−, and toluene ligands. The lanthanum atoms in [La5Al9(CH)6(CH3)30] are arranged in a trigonal bipyramidal fashion with (CH) functionalities capping each face. The {La5(CH)6}3− core is formally balanced by three AlMe2+ moieties and is additionally supported by six AlMe3 ligands. The unit cell contains two independent La5 clusters, one with pseudo‐C3h and the other with pseudo‐D3 symmetry, as well as two molecules of the separation co‐product Me3Al(PMe3).
Hybrid Host–Guest Complexes: Directing the Supramolecular Structure through Secondary Host–Guest Interactions
Authors: Streb Carsten , McGlone Thomas , Brücher Oliver , Long De‐Liang , Cronin Leroy 
Published: September 2008

AbstractA set of four hybrid host–guest complexes based on the inorganic crown ether analogue [H12W36O120]12− ({W36}) have been isolated and characterised. The cluster anion features a central rigid binding site made up of six terminal oxygen ligands and this motif allows the selective binding of a range of alkali and alkali‐earth‐metal cations. Here, the binding site was utilised to functionalise the metal oxide‐based cavity by complexing a range of protonated primary amines within the recognition site. As a result, a set of four hybrid organic–inorganic host–guest complexes were obtained whereby the interactions are highly directed specifically within this cavity. The guest cations in these molecular assemblies range from the aromatic 2‐phenethylamine (1) and 4‐phenylbutylamine (2) to the bifunctional aromatic p‐xylylene diamine (3) and the aliphatic, bifunctional 1,6‐diaminohexane (4). Compounds 1–4 were structurally characterised by single‐crystal X‐ray diffraction, elemental analysis, flame atomic absorption spectroscopy, FTIR and bond valence sum calculations. This comparative study focuses on the supramolecular effects of the amine guest cations and investigates their structure‐directing effects on the framework arrangement arising by locking the protonated amines within the cavity of the {W36} cluster. It was shown that parts of the organic guest cation protrude from the central binding cavity and the nature of this protruding organic “tail” directs the solid‐state arrangement of compounds 1–4. Guest cations with a hydrophobic phenyl tail result in an antiparallel assembly of {W36} complexes arranged in a series of pillared layers. As a consequence, no direct supramolecular interactions between {W36} clusters are observed. In contrast, bifunctional guest cations with a secondary amino binding site act as molecular connectors and directly link two cluster units thus locking the supramolecular assembly in a tilted arrangement. This direct linking of {W36} anions results in the formation of an infinite supramolecular scaffold.
Highly Stereoselective Iodolactonization of 4,5‐Allenoic Acids—An Efficient Synthesis of 5‐(1′‐Iodo‐1′(Z)‐alkenyl)‐4,5‐dihydro‐2(3H)‐furanones
Authors: Jiang Xinpeng , Fu Chunling , Ma Shengming 
Published: September 2008

AbstractIn this paper, it is reported that the efficient iodolactonization of 4,5‐allenoic acid with I2 in cyclohexane in the presence or absence of K2CO3 afforded 5‐(1′‐iodo‐1′(Z)‐alkenyl)‐4,5‐dihydro‐2(3H)‐furanones highly stereoselectively. However, the reaction of axially optically active 4,5‐allenoic acids (R)‐(−)‐5 a and (R)‐(−)‐5 b with I2 afforded the corresponding products with a serious loss of chirality. This problem was solved by conducting the iodolactonization with N‐iodosuccinimide in CH2Cl2 in the presence of Cs2CO3; however, the Z/E selectivity is somewhat lower. The pure optically active Z products were prepared by subsequent kinetic resolution with Sonogashira coupling. The reaction of the substrates with a substituent at the 3‐position of the starting 4,5‐allenoic acids afforded the trans‐4,5‐disubstituted γ‐butyrolactones as the only products. The reaction of the 4,5‐allenoic acids (S)‐(+)‐1 l, (R)‐(−)‐1 l, and (S)‐(+)‐1 m with a center chirality at the 3‐position afforded the trans products with very high enantiopurity and up to 98:2 Z/E selectivity regardless of the axial chirality of the allene moiety.
ChemInform Abstract: A Potential Red Phosphor ZnMoO4:Eu3+ for Light‐Emitting Diode Application.
Authors: Zhou Li‐Ya , Wei Jian‐She , Gong Fu‐Zhong , Huang Jun‐Li , Yi Ling‐Hong 
Published: September 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: Relationship Between Interlayer Hydration and Photocatalytic Water Splitting of A′1‐xNaxCa2Ta3O10 ×nH2O (A′: K and Li).
Authors: Mitsuyama Tomohiro , Tsutsumi Akiko , Sato Sakiko , Ikeue Keita , Machida Masato 
Published: September 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: Hydrothermal Synthesis of Lanthanide Fluorides LnF3 (Ln: La to Lu) Nano‐/Microcrystals with Multiform Structures and Morphologies.
Authors: Li Chunxia , Yang Jun , Yang Piaoping , Lian Hongzhou , Lin Jun 
Published: September 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, Structure and Magnetic Behavior of Mixed Metal Leucophosphite.
Authors: Shi Fa‐Nian , dos Santos Antonio Moreira , Cunha‐Silva Luis , Costa Benilde F. O. , Klinowski Jacek , Paz Filipe A. Almeida , Amaral Vitor S. , Rocha Joao , Trindade Tito 
Published: September 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.