bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Reactivity of Calicheamicin γ1I in the Minor Groove of DNA: The Decisive Role of the Environment
Authors: Kraka Elfi , Tuttle Tell , Cremer Dieter 
Published: August 2007

AbstractTriggering and Bergman cyclization of calicheamicin γ1I outside and inside the minor groove of the duplex 9mer‐B‐DNA sequence d(CACTCCTGG)⋅d(CCAGGAGTG) were investigated by using density functional theory and molecular mechanics (DFT and MM) descriptions in which the ligand is completely described at the DFT and the receptor at the MM level. The calculated docking energy of calicheamicin γ1I (−12.5 kcal mol−1) is close to the measured value of −9.7 kcal mol−1 and the site specificity is in line with experimental observations. Calicheamicin is triggered in the minor groove in such a way that out of a cyclohexenone by Michael addition an E rather than a Z form of a cyclohexanone is formed, which in turn adopts a chair rather than a twistboat form. Decisive for the stereochemistry of the Michael addition is the orientation of the carbamate substituent at the headgroup of calicheamicin. Triggered calicheamicin can undergo the Bergman cyclization at body temperature only if present in its E chair form (activation enthalpy 16.4 kcal mol−1). An intermediate biradical is formed (docking energy −13.6 kcal mol−1), which has a sufficient lifetime to abstract two hydrogen atoms. Hydrogen abstraction is a two‐ rather than one‐step process and involves the C5(H5′) atom first and then the T22(H4′) atom in line with experimental observations. The decisive role of using a DFT rather than an MM description for the ligand is documented.
Organocatalysed Asymmetric β‐Amination and Multicomponent syn‐Selective Diamination of α,β‐Unsaturated Aldehydes
Authors: Jiang Hao , Nielsen Johanne B. , Nielsen Martin , Jørgensen Karl Anker 
Published: August 2007

AbstractAn easy and affordable route for obtaining chiral β‐aminated‐ and α,β‐diaminated aldehydes, 1,3‐aminoalcohols, and related compounds by using organocatalysis is presented. The chiral secondary amine (S)‐2‐[bis(3,5‐bistrifluoromethylphenyl)trimethylsilanyloxymethyl]pyrrolidine is used as the catalyst to activate α,β‐unsaturated aldehydes, which allows succinimide to add in a 1,4‐regio‐ and stereoselective fashion thereby forming N‐protected 1,3‐aminoaldehydes in good yields and enantioselectivities. This is followed by two easy transformations giving rise to optically active 1,3‐aminoalcohols, a common motif in many biologically active compounds, for example, fibrinogen receptor antagonists. Furthermore, optically active α,β‐syn‐diaminated aldehydes were obtained by the addition of diethyl azodicarboxylate in a one‐pot reaction.
Synthesis and Structural Characterization of Two New Hexagonal Osmates: Ba2Fe0.92Os1.08O6 and Ba2Co0.77Os1.23O6.
Authors: Gemmill William R. , Smith Mark D. , zur Loye Hans‐Conrad 
Published: August 2007

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, please click on HTML or PDF.
Enantioselective Addition of Alkenylzinc Reagents to Aldehydes with Organoboronates as the Alkenyl Source.
Authors: Chai Zhuo , Liu Xin‐Yuan , Zhang Jun‐Kang , Zhao Gang 
Published: August 2007

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, please click on HTML or PDF.
Stereocontrolled Access to α‐Fluoro‐β‐ketoesters.
Authors: Delarue‐Cochin Sandrine , Bahlaouan Bouchaib , Hendra Frederic , Ourevitch Michele , Joseph Delphine , Morgant Georges , Cave Christian 
Published: August 2007

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, please click on HTML or PDF.
Synthesis and Chemical Properties of 5‐Alkylsulfonyl‐1‐(4‐nitrophenyl)tetrazoles (III).
Authors: Egorova N. G. , Artamonova T. V. , Koldobskii G. I. 
Published: August 2007

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, please click on HTML or PDF.
Discovery of 4‐Amino‐5,6‐biaryl‐furo[2,3‐d]pyrimidines as Inhibitors of Lck: Development of an Expedient and Divergent Synthetic Route and Preliminary SAR.
Authors: DiMauro Erin F. , et al. et al. 
Published: August 2007

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, please click on HTML or PDF.
A Double Mannich‐Type Reaction in the 1,4,5,6‐Tetrahydropyridine‐2‐thiolate Series: A Convenient Approach to Functionalized 3,7‐Diazabicyclo[3.3.1]nonane Derivatives.
Authors: Dotsenko Victor V. , Krivokolysko Sergey G. , Litvinov Victor P. 
Published: August 2007

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, please click on HTML or PDF.
The First Total Synthesis of Telephiose A.
Authors: Sato Ken‐ichi , Sakai Koudai , Tsushima Keiko , Akai Shoji 
Published: August 2007

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, please click on HTML or PDF.
Inflammatory breast cancer (IBC) and patterns of recurrence
Authors: Cristofanilli Massimo , Valero Vicente , Buzdar Aman U. , Kau Shu‐Wan , Broglio Kristine R. , Gonzalez‐Angulo Ana Maria , Sneige Nour , Islam Rabiul , Ueno Naoto T. , Buchholz Thomas A. , Singletary Sonja E. , Hortobagyi Gabriel N. 
Published: August 2007

AbstractBACKGROUND.Inflammatory breast cancer (IBC) is the most aggressive manifestation of primary breast cancer. The authors compared the prognostic features of IBC and non‐IBC locally advanced breast cancer (LABC) to gain insight into the biology of this disease entity.METHODS.This retrospective analysis consisted of 1071 patients, comprising 240 patients with IBC and 831 patients with non‐IBC LABC who were enrolled in 10 consecutive clinical trials (5 from each disease group). All patients received similar multidisciplinary treatment. The authors measured time to disease recurrence for each individual site from the start of treatment to the date of disease recurrence or last follow‐up (recurrence‐free survival) and overall survival rates to the date of last follow‐up or death.RESULTS.The median follow‐up period was 69 months (range, 1–367 months). Pathologically complete response rates were 13.9% and 11.7% in the IBC and non‐IBC LABC groups, respectively (P = .42). The 5‐year estimates of cumulative incidence of recurrence were 64.8 % and 43.4% (P < .0001), respectively, for IBC and non‐IBC LABC. IBC had significantly higher cumulative incidence of locoregional recurrence and distant soft‐tissue and bone disease. The 5‐year overall survival (OS) rate was 40.5% for the IBC group (95% CI, 34.5%–47.4%) and 63.2% for the non‐IBC LABC group (95% CI, 60.0%–66.6%; P < .0001).CONCLUSIONS.IBC was associated with a worse prognosis and a distinctive pattern of early recurrence compared with LABC. These data suggested that investigating factors affecting “homing” of cancer cells may provide novel treatment strategies for IBC. Cancer 2007. © 2007 American Cancer Society.
Patient selection, cancer control, and complications after salvage local therapy for postradiation prostate‐specific antigen failure
Authors: Nguyen Paul L. , D'Amico Anthony V. , Lee Andrew K. , Warren Suh W. 
Published: August 2007

AbstractAmong men who experience prostate‐specific antigen (PSA) failure after external beam radiation or brachytherapy (RT), many will harbor occult micrometastases; however, a significant minority will have a true local‐only failure and, thus, potentially may benefit from a salvage local therapy. Those most likely to have a local‐only failure initially have low‐risk disease (PSA < 10 ng/mL, Gleason score ≤6, clinical T1c or T2a tumor status), pretreatment PSA velocity < 2.0 ng/mL per year at the time of initial presentation, interval to PSA failure > 3 years, PSA doubling time > 12 months, negative bone scan and pelvic imaging, and positive rebiopsy. In addition, men with presalvage PSA levels > 10 ng/mL, presalvage T3/T4 disease, or presalvage Gleason scores ≥7 on a rebiopsy sample without significant RT effects are unlikely to be cured by salvage local therapy. Based on a review of all series of post‐RT salvage prostatectomy, cryosurgery, and brachytherapy published in English since 1990, morbidity can be substantial. Although urinary incontinence appeared to be greater after salvage prostatectomy (41%) or cryosurgery (36%) than after brachytherapy (6%), patients who received salvage brachytherapy faced a 17% risk of grade 3 or 4 genitourinary complications and a fistula risk that averaged 3.4% across all series. From this review, the authors concluded that prospective randomized studies are needed to determine the relative efficacy of the 3 major local salvage modalities and that additional research is needed to identify factors associated with an increased risk of significant complications to improve patient selection and to augment the benefit/risk ratio associated with attempts to cure local‐only recurrences after radiation therapy. Cancer 2007. © 2007 American Cancer Society.
Oxidation of NIII and N–I by an {Mn4O6}4+ Core in Aqueous Media: Proton‐Coupled Electron Transfer
Authors: Das Suranjana , Mukhopadhyay Subrata 
Published: August 2007

Abstract[Mn4(μ‐O)6(bipy)6]4+ (14+; bipy = 2,2′‐bipyridine) and its conjugate acid [Mn4(μ‐O)5(μ‐OH)(bipy)6]5+ (1H5+) quantitatively oxidise NIII (HNO2 and NO2–) and N–I (NH3OH+ and NH2OH) to NV (nitrate) and NI (nitrous oxide), respectively, in aqueous solution (pH 2.0–6.0), with 1H5+ reacting much faster than 14+. An uncommon feature of these reactions is the kinetic superiority of HNO2 over its conjugate base NO2–. NH2OH, however, behaves normally ― the conjugate acid NH3OH+ is less reactive than NH2OH. These reactions show remarkable kinetic isotope effects: the observed rate of NIII oxidation increases in D2O media whereas the N–I oxidation rate slows down in media enriched with D2O. A search of the available data on the redox kinetics of multinuclear oxidants suggests that the title {Mn4O6}4+ reduction by NIII, the rate of which is accelerated in D2O, is the only one established so far. A hydrogen atom transfer (HAT) mechanism (1e, 1H+; electroprotic) is proposed.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
Reactions of 1,2,4‐Trithiolanes with Nonacarbonyldiiron: Sulfurdithiolatodiiron and ‐tetrairon Complexes as Mimics for the Active Site of [Fe‐only] Hydrogenase
Authors: Windhager Jochen , Görls Helmar , Petzold Holm , Mloston Grzegorz , Linti Gerald , Weigand Wolfgang 
Published: August 2007

AbstractThe reactions of 1,2,4‐trithiolane (1a), 3,3,5,5‐tetramethyl‐1,2,4‐trithiolane (1b), 3,3,5,5‐tetraethyl‐1,2,4‐trithiolane (1c), 3,3,5,5‐bis(pentamethylene)‐1,2,4‐trithiolane (1d) and di‐spiro{tricyclo[3.3.1.1]decane‐2,3″‐(1,2,4)‐trithiolane‐5′,2′‐tricyclo[3.3.1.1]decane} (1e) with nonacarbonyldiiron (2) have been investigated. The sulfurdithiolatodiiron complexes 3a–e, which can be considered as novel model complexes of the active site of the [Fe‐only] hydrogenase, were isolated as the main products of these reactions. X‐ray structure analyses were performed on compounds 3b–e. The carbon dithiolato (SCR2S)‐bridged diiron side‐products 4a–e and the tetranuclear clusters 6b–d were also obtained and characterised by X‐ray diffraction analysis (4b–e and 6b–d). In contrast, the reaction of 1e with 2 affords the trinuclear complex 7, which contains a side‐on bonded adamantanethione, besides 3e and 4e. Finally, the reaction of 3a with two equivalents of (Et4N)CN gives the monocyanide complex 8 in good yield. Density functional calculations have been performed to evaluate the bonding situation in the di‐ and tetranuclear clusters. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
Antecedents, consequences, and moderators of time perspective heterogeneity for knowledge management in MNO teams
Authors: Gibson Cristina B. , Waller Mary J. , Carpenter Mason A. , Conte Jeffrey M. 
Published: August 2007

AbstractMultinational organizations (MNOs), more so than other organizations, are likely to require individuals with different perspectives, experiences, and backgrounds to form teams and collaboratively manage knowledge. We develop a framework that shows why variations in time perspectives among members of teams occur and how such differences can exert significant but unacknowledged influences on knowledge management efforts in MNOs, including: (1) innovativeness of knowledge created (2) speed of knowledge creation and (3) speed of knowledge transfer between teams. We also provide new insights into benefits of time perspective heterogeneity for teams managing knowledge. Copyright © 2007 John Wiley & Sons, Ltd.
Faking emotional intelligence (EI): comparing response distortion on ability and trait‐based EI measures
Authors: Day Arla L. , Carroll Sarah A. 
Published: August 2007

AbstractWe compared the susceptibility of two emotional intelligence (EI) tests to faking. In a laboratory study using a within‐subjects design, participants completed the EQ‐i and the MSCEIT in two sessions. In the first session (i.e., the ‘applicant condition’), participants were given a job description and asked to respond to the EI measures as though they were applying for that job. Participants returned 2 weeks later to repeat the tests in a ‘non‐applicant’ condition in which they were told to answer as honestly as possible. Mean differences between conditions indicated that the EQ‐i was more susceptible to faking than the MSCEIT. Faking indices predicted applicant condition EQ‐i scores, after controlling for participants' non‐applicant EQ‐i scores, whereas the faking indices were unrelated to applicant condition MSCEIT scores, when the non‐applicant MSCEIT scores were controlled. Using top‐down selection, participants were more likely to be selected based on their applicant condition EQ‐i scores than their non‐applicant EQ‐i scores, but they had an equal likelihood of being selected based on their MSCEIT scores from each condition. Implications for the use of these two EI tests are discussed. Copyright © 2007 John Wiley & Sons, Ltd.
The relationship between rock glacier and contributing area parameters in the Front Range of Colorado
Authors: Janke Jason , Frauenfelder Regula 
Published: August 2007

AbstractRock glaciers are an end unit of the coarse debris system that links frost weathering and rockfall to debris transport in mountainous environments. By examining topographic and climatic controls on creep, a better understanding of rock glacier formation and evolution could be obtained. A series of statistical tests were run comparing contributing area parameters (width, length, area, slope, headwall height, etc.) and rock glacier variables (width, length, area, thickness, slope, creep and temperature) in the Front Range of Colorado. Results showed that rock glacier width had the strongest correlation with contributing area width due to an abundance of lobate rock glaciers (r = 0.78). Rock glacier area and contributing area size were also related (r = 0.74), but are also a function of talus production factors. Mean surface velocity appears to be better correlated with thickness (r = 0.58) and length (r = 0.62), rather than slope (r = 0.33). Mean annual air temperature had a stronger exponential relationship with maximum velocities (r = 0.76) compared to mean annual velocity (r = 0.60). Front Range rock glacier velocities tend to decrease with warming, suggesting that the volume of ice and debris, rates of shear in plastic layers, or melt water may have a greater influence on deformation. Copyright © 2007 John Wiley & Sons, Ltd.
Development of a two‐step screening ESI‐TOF‐MS method for rapid determination of significant stress‐induced metabolome modifications in plant leaf extracts: The wound response in Arabidopsis thaliana as a case study
Authors: Grata Elia , Boccard Julien , Glauser Gaetan , Carrupt Pierre‐Alain , Farmer Edward E. , Wolfender Jean‐Luc , Rudaz Serge 
Published: August 2007

AbstractTo study the stress‐induced effects caused by wounding under a new perspective, a metabolomic strategy based on HPLC‐MS has been devised for the model plant Arabidopsis thaliana. To detect induced metabolites and precisely localise these compounds among the numerous constitutive metabolites, HPLC‐MS analyses were performed in a two‐step strategy. In a first step, rapid direct TOF‐MS measurements of the crude leaf extract were performed with a ballistic gradient on a short LC‐column. The HPLC‐MS data were investigated by multivariate analysis as total mass spectra (TMS). Principal components analysis (PCA) and hierarchical cluster analysis (HCA) on principal coordinates were combined for data treatment. PCA and HCA demonstrated a clear clustering of plant specimens selecting the highest discriminating ions given by the complete data analysis, leading to the specific detection of discrete‐induced ions (m/z values). Furthermore, pool constitution with plants of homogeneous behaviour was achieved for confirmatory analysis. In this second step, long high‐resolution LC profilings on an UPLC‐TOF‐MS system were used on pooled samples. This allowed to precisely localise the putative biological marker induced by wounding and by specific extraction of accurate m/z values detected in the screening procedure with the TMS spectra.
Integration of arbuscular mycorrhiza inoculation in hydroseeding technology: effects on plant growth and inter‐species competition
Authors: Estaún V. , Vicente S. , Calvet C. , Camprubí A. , Busquets M. 
Published: August 2007

AbstractHydroseeding is a technique increasingly used to establish vegetation on large degraded areas, such as large‐scale road construction sites and quarries. Native grasses and legume species are used on rehabilitation and restoration projects as a first step in the recovery of such places, prior to the establishment of native forbs and shrubs that occurs at a slower pace. The effect of mycorrhizal inoculation on the development of nine species of grasses and legumes that can be potentially used in restoration processes in the Mediterranean area was studied, in microcosm experiments under greenhouse conditions. The effect of adding arbuscular mycorrhizal (AM) inoculum to a hydroseeding mixture was also investigated in greenhouse and in field conditions. In the hydroseeding experiments the mycorrhizal inoculum was added to the seed slurry in a jet agitated hydroseeding machine and sprayed to the soil surface with a pressurised spray in a one‐step application. The study shows that Glomus intraradices Schenk & Smith BEG72 is able to establish the symbiosis when applied at sowing while Glomus mosseae (Nicol. & Gerd.) Gerdemann & Trappe BEG116 is not. It also confirms that legumes are more highly mycotrophic than grasses. The results of the hydroseeding experiments demonstrate the establishment of the symbiosis using this technology, both in the greenhouse and in the field. Mycorrhizal inoculation improved above ground plant growth and increased the legumes/grasses ratio. Copyright © 2007 John Wiley & Sons, Ltd.
Substrate‐Independent Stable and Adherent Reactive Surface Coatings and their Conversion with Amines
Authors: Kessler Daniel , Metz Nadine , Theato Patrick 
Published: August 2007

AbstractSummary: To create stable, adherent and reactive surface coatings, a hybrid polymer composed of poly(methylsilsesquioxane) (PMSSQ) and poly(pentafluorophenyl acrylate) PFPA with a Mn of 32000 g/mol was prepared by a RAFT polymerization procedure. These hybrid polymer has been used for coating experiments. The PFPA part enabled a variable functionalization of the coating afterwards. The stability on various substrates (e.g. glass, PMMA, steel) was tested in an ISO tape test. These reactive surface coatings were modified using different amines, such as amino‐terminated PEG, dodecyl amine and N‐isopropyl amine. The conversion was analyzed by FT‐IR and contact angle measurements.
Photoinitiator‐Free Photopolymerization of Silicon‐Containing Maleimides Based on Electron‐Donor‐Acceptor Systems
Authors: Ahn Kwang‐Duk , Kang Jong‐Hee , Yoo Kynug Wook , Choo Dong Joon 
Published: August 2007

AbstractSummary: Photocured coatings promise enhanced performance, higher productivity and an improved environmental impact on the favorable reduction or near elimination of volatile organic compounds. Increasing interest in the photocuring industry has been imposed on the “photoinitiator‐free photopolymerization [PIFP]” system based on the electron‐donor‐acceptor [EDA] concept, which commonly employs a mixture of a vinyl ether monomer (donor) and an N‐substituted maleimide or bismaleimide monomer (acceptor). The PIFP systems employing silicon‐containing maleimides together with vinyl ether monomers were firstly investigated and their photoreactions resulted in quite fast curing comparable to the conventional acrylate‐ based photocurable systems.
Colloidal Systems on the Basis of Novel Reactive Surfmers
Authors: Hevus Orest , Kohut Ananiy , Fleychuk Roman , Mitina Natalija , Zaichenko Oleksandr 
Published: August 2007

AbstractSummary: New anion surfmers of the family of maleic acid asymmetrical esters have been synthesized. Some of its features in the process of emulsion copolymerization with styrene have been studied. The characteristics of covering, obtained on the basis of such latexes of new generation have been investigated as well.
Emulsion Polymerization of Styrene and Vinyl Acetate with Cationic Surfactant
Authors: Erkal Durdane , Senkal B. Filiz , Sarac Ayfer 
Published: August 2007

AbstractSummary: In this study, the emulsion homopolymerization system containing vinyl acetate and styrene, potassium persulfate, and a new cationic surfactant was studied in the classical glass emulsion polymerization reactor. The effects of new polymeric emulsifier on the physicochemical properties of obtained vinyl acetate and styrene latex properties were investigated depending on surfactant percentage in homopolymerizations.
Effects of Confinement on the Kinetics of Formation of Sequential Semi‐Interpenetrating Polymer Networks
Authors: Alekseeva Tatiana , Lipatov Yuri , Sorochinskaya Lyubov , Dudarenko Galina 
Published: August 2007

AbstractSummary: Peculiarities of formation kinetics of sequential semi‐interpenetrating polymer networks (semi‐IPNs) based on crosslinked polyurethane (PU) with different cross‐linking density and linear polystyrene (PS), polybutylmethacrylate (PBMA) and polymethacrylate acid (PMAA) have been studied. The experimental data show the dependence of the kinetic parameters of polymerization on Mc, this dependence being different for various monomers. Sharp discrepancy in molecular mass distribution of polymers formed in various matrices has been observed. The differences in dependencies of reaction kinetics and molecular mass distribution are supposed to be connected to various dependence of the chain growth and termination of various monomers on the density of network, i.e. on the confinements imposed by the intranetwork space.