bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis and anti‐HIV activity of new 2‐thiolumazine and 2‐thiouracil metal complexes
Authors: Al‐Masoudi Najim A. , Saleh Basil A. , Karim Nesreen Abdul , Issa Ahmed Y. , Pannecouque Christoph 
Published: November 2010

AbstractA series of new Cu(II), Pt(II), VO(II), Fe(II), and Co(II) complexes (1‐‐5) with 3‐methyl‐6,7‐diphenyllumazine are described. Similarly, complexes from 2‐thiouracil with Cu(II) (6,7) and Pt(II) (8) have been prepared and characterized by spectroscopic methods. All the complexes were assayed for their anti‐HIV‐1 and HIV‐2 activity by examination of their inhibition of HIV‐induced cytopathogenicity in MT‐4 cells. Compound 3 was found to be the most active inhibitor against HIV‐2 in cell culture (EC50 = >18.9 μ g/mL, selectivity index (SI) = 3), which provided a good lead for further optimization. Compounds 6 and 7 exhibited some activity (EC50 = >7.12 μ g/mL and >2.23 μ g/mL) against HIV‐1 and HIV‐2, but no selectivity was observed (SI <1). © 2010 Wiley Periodicals, Inc. Heteroatom Chem 22:44–50, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/hc.20654
Polystyrene‐supported aluminum chloride: An efficient and recyclable green catalyst for one‐pot synthesis of 14‐aryl or alkyl‐14H‐dibenzo[a,j]xanthenes
Authors: Rahmatpour Ali , Aalaie Jamal 
Published: November 2010

AbstractA new, mild, and efficient method has been developed for the one‐pot synthesis of 14‐aryl or alkyl‐14H‐dibenzo[a,j]xanthenes by condensation of 2‐naphthol and aryl or alkyl aldehydes in the presence of a catalytic amount of cross‐linked polystyrene‐supported aluminum chloride (PS/AlCl3) as an ecofriendly heterogeneous catalyst. This polymeric solid acid catalyst is stable and can be easily recovered and reused without appreciable change in its activity. © 2010 Wiley Periodicals, Inc. Heteroatom Chem 22:51–54, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/hc.20655
Studies on the toxic effects of microcystin‐LR on the zebrafish (Danio rerio) under different temperatures
Authors: Zhang Xuezhen , Ji Wei , Zhang Huan , Zhang Wei , Xie Ping 
Published: November 2010

AbstractIt is well known that fish have stronger tolerance than mammals to microcystin (MC) exposure, and such a difference is attributed to their different core body temperatures. However, no in vivo study has been conducted to investigate the effects of temperature on MC‐induced toxicity in fish, a typical poikilotherm. Tolerance and detoxification response of zebrafish treated with MC‐LR were investigated under three temperatures. The LD50 values evidently increased with a decline of the temperature (547, 260 and 176 µg kg−1 at 12, 22 and 32 °C, respectively), indicating stronger tolerance of the fish at lower temperatures. Changes in the transcription of glutathione S‐transferase (GST) isoforms in the fish were observed, and their sensitivity of response in the transcription of GST mRNA was on the order of 12 > 32 > 22°C. We screened out several GST genes which were more delicate to solve the MC‐LR exposure at different temperatures, i.e. GST rho1, al, p1 and theta1 in the 12 °C group, and GST zeta1 and p2 in the 22 and 32 °C groups. Our findings partly validate the hypothesis that high temperature enhances toxic effects of MCs on poikilotherms. Our studies also indicate that temperature‐dependent toxic effects should be taken into account for field toxic assessment of microcystins in fish. Copyright © 2010 John Wiley & Sons, Ltd.
An efficient one‐pot synthesis of diarylpyrazolo[1,5‐a]pyrimidine from isoflavones
Authors: Zhang Zun‐Ting , Ma Yu‐Qing , Liang Yong , Xue Dong , He Qing 
Published: November 2010

AbstractDirect synthetic methods of 6,7‐diphenylpyrazolo[1,5‐a]pyrimidine derivatives have been developed. Cyclocondensation of isoflavones with 3‐aminopyrazole in the presence of sodium methoxide as alkali promoter gave 6,7‐diphenylpyrazolo[1,5‐a]pyrimidines in moderate to good yields. J. Heterocyclic Chem., (2011).
Public policies and venture capital in supporting SMEs: An economic comparison of available instruments
Authors: Gai Lorenzo , Rossi Federico , Catelani Edoardo 
Published: November 2010

AbstractIn the present economic conditions public bodies are compelled to rethink assistance given to small and medium enterprises in access to credit while venture capital, mutual guarantee provisions and collateral may help these firms to avoid dangerous short‐circuits between demand and offer of financial resources.
Some Remarks on Orlicz‐Lorentz Spaces
Authors: Kamińska Anna 
Published: November 2010

AbstractSpaces of Lorentz type called Orlicz‐Lorentz spaces are studied. There are given necessary and sufficient conditions for the spaces to be order continuous, separable, KB‐spaces and to contain isometric or isomorphic copy of l∞ or c0. Moreover a criterion for strict convexity of these spaces is found.
On a Formula for the L2 Wasserstein Metric between Measures on Euclidean and Hilbert Spaces
Authors: Gelbrich Matthias 
Published: November 2010

AbstractFor a separable metric space (X, d) Lp Wasserstein metrics between probability measures μ and v on X are defined by

where the infimum is taken over all probability measures η on X × X with marginal distributions μ and v, respectively. After mentioning some basic properties of these metrics as well as explicit formulae for X = R a formula for the L2 Wasserstein metric with X = Rn will be cited from [5], [9], and [21] and proved for any two probability measures of a family of elliptically contoured distributions.Finally this result will be generalized for Gaussian measures to the case of a separable Hilbert space.
A Representation of Finitely‐Modular AC‐lattices
Authors: Hamhalter Jan 
Published: November 2010

AbstractWe give a lattice‐theoretic characterization of the lattices of Mackey closed subspaces in a vector space V (dim V ≧ 4): These are exactly complete finitely‐modular AC‐lattices of the length at least four which have mutually perspective atoms.
Double Covers of Some Fano Manifolds as Hyperplane Sections
Authors: Lanteri Antonio , Occhetta Gianluca 
Published: November 2010

AbstractLet Y be a Fano manifold of dimension n ⩾ 3 with b2(Y and index n – 1 and let A be a projective manifold which is a double cover of Y. We determine which complex projective manifolds can admit A among their hyperplane sections.
On Rate‐Type Viscoplastic Problems with Linear Boundary Conditions
Authors: Rochdi M. , Sofonea M. 
Published: November 2010

AbstractIn this paper we introduce the abstract concept of “linear boundary conditions” in the study of deformable bodies. We establish two existence and uniqueness results concerning respectively quasistatic and dynamic problems involving such type of boundary conditions. We also apply these existence results in the study of viscoplastic problems involving classical boundary conditions.
Variation of Ramification Loci of Generic Projections
Authors: Flenner Hubert , Manaresi Mirella 
Published: November 2010

AbstractLet X C PN = P be a subvariety of dimension n and ∧ PN be a generic linear subspace of dimension N k ‐ 1 with k ≥ n. Then the linear projection π∧: X → Pk is a finite map. Let R(π∧) be its ramification locus. In this paper we study the map from the Grassmannian G(N ‐ k ‐ 1, N) of planes of dimension N ‐ k ‐ 1 in PN to the Hilbert moduli space given by ∧ R(π∧). We wish to compute in particular the dimension, say, n of the image of this map. The motivation of this question comes from the fact that these ramification cycles are closely related to the Stückrad ‐ Vogel cycle. We show that n is just the transcendence degree of a certain part of this cycle. The main result is that, under some mild hypothesis, in case of a projection X → Pn, i.e., k = n, the map ∧ → R(π∧) is generically finite and so n takes its maximal possible value. Moreover, we show that in the case of smooth surfaces X ∇ P4 and generic projections onto P3 this map is again generically finite if the normal bundle of X in P4 is sufficiently positive.
Nevanlinna Functions, Perturbation Formulas, and Triplets of Hilbert Spaces
Authors: Hassi Seppo , de Snoo Henk 
Published: November 2010

AbstractLet S be a closed symmetric operator with defect numbers (1,1) in a Hilbert space 𝔥 and let A be a selfadjoint operator extension of S in 𝔥. Then S is necessarily a graph restriction of A and the selfadjoint extensions of S can be considered as graph perturbations of A, cf. [8]. Only when S is not densely defined and, in particular, when S is bounded, 5 is given by a domain restriction of A and the graph perturbations reduce to rank one perturbations in the sense of [23]. This happens precisely when the Q ‐ function of S and A belongs to the subclass No of Nevanlinna functions. In this paper we show that by going beyond the Hilbert space 𝔥 the graph perturbations can be interpreted as compressions of rank one perturbations. We present two points of view: either the Hilbert space 𝔥 is given a one‐dimensional extension, or the use of Hilbert space triplets associated with A is invoked. If the Q ‐ function of S and A belongs to the subclass N1 of Nevanlinna functions, then it is convenient to describe the selfadjoint extensions of S including its generalized Friedrichs extension (see [6]) by interpolating the original triplet, cf. [5]. For the case when A is semibounded, see also [4]. We prove some invariance properties, which imply that such an interpolation is independent of the (nonexceptional) extension.
Towers of Global Function Fields with Asymptotically Many Rational Places and an Improvement on the Gilbert ‐ Varshamov Bound
Authors: Niederreiter Harald , Xing Chaoping 
Published: November 2010

AbstractWe construct infinite class field towers of global function fields with asymptotically many rational places. In this way, we improve on asymptotic bounds of Serre, Perret, Schoof, and Xing. The results can be interpreted equivalently as asymptotic bounds on the number of rational points of smooth algebraic curves over finite fields. As an application, we show an improvement on the Gilbert‐Varshamov bound for linear codes over finite fields of a sufficiently large composite nonsquare order.
Differential Equations on Manifolds with Singularities in Classes of Resurgent Functions
Authors: Schulze B.‐W. , Sternin B. , Shatalov V. 
Published: November 2010

AbstractIn the paper, a new method of constructing asymptotic solutions of differential equations on manifolds with singularities is presented. This method allows not only to widen essentially the space of asymptotics but also to obtain explicit formulas for asymptotic expansions, in particular, in the case when in a neighborhood of a singular point there exist strata of different dimensions.
An Eigenvalue Problem for a Quasilinear Elliptic Equation
Authors: Cheng Yuanji 
Published: November 2010

AbstractIn this paper, we are concerned with the following eigenvalue problem: here Ω is a C1,α‐domain and Δp is the degenerate p‐Laplace operator with p > 1. An interesting special case is when f = π(χ)|u|σ1−1 u+ϕ(χ)|u|σ−1u, 0 < q1 <q2. By using the sub‐ and supersolutions method and the variational method, we prove the existence of the solution of the problem under certain growth conditions for f(χ,u). In the above special case, our results give the existence of at least one positive solution for q2 < p* ‐ 1, where p* is the critical Sobolev exponent, and the existence of at least two positive and two negative solutions for q1 < p ‐ 1 < q2 < p* ‐ 1. We also present a 1D example which has many positive solutions for certain interval of λ and for a special value of λ it has even infinitely many solutions.
Function Spaces with Exponential Weights II
Authors: Schott Thomas 
Published: November 2010

AbstractThis paper is a continuation of [8]. We study weighted function spaces of type B and F on the Euclidean space Rn, where u is a weight function of at most exponential growth. In particular, u(χ (±|χ|) is an admissible weight. We deal with atomic decompositions of these spaces. Furthermore, we prove that the spaces B and F are isomorphic to the corresponding unweighted spaces B and F.
A Riemann Singularity Theorem for Generalised Brill – Noether Loci
Authors: Teixidor Montserrat 
Published: November 2010

AbstractConsider a generic vector bundle E of given rank and degree. Consider the subscheme of the Jacobian of line bundles L such that E ⊗ L has a section. We show that the singular locus of this subscheme consists of all line bundles such that E ⊗ L has at least two sections.
The Full T1 Theorem for Certain Triebel ‐ Lizorkin Spaces
Authors: Wang Kunchuan 
Published: November 2010

AbstractPrevious authors have considered generalizations of the David‐Journé T1 theorem to the scale of Triebel ‐ Lizorkin spaces (IRn) under the T1 = 0 and T = 0 assumptions, where T is a (generalized) Calderon ‐ Zygmund operator. We prove boundedness on (IRn) under weaker assumptions on T1 and T1, which are related to the sharp T1, T BMO assumptions for in the David‐Journé theorem. In some cases we also show that our conditions are sharp. By similar techniques, we also obtain sharper conditions for “families of molecules” and “norming families” for these spaces.
On the Injective Tensor Product of Distinguished Frechet Spaces
Authors: Carlos Díaz Juan , Domaeski Pawel 
Published: November 2010

AbstractAn example of two distinguished Fréchet spaces E, F is given (even more, E is quasinormable and F is normable) such that their completed injective tensor product E⊗F is not distinguished. On the other hand, it is proved that for arbitrary reflexive Fréchet space E and arbitrary compact set K the space of E ‐ valued continuous functions C(K, E) is distinguished and its strong dual is naturally isomorphic to ⊗ where L1(μ) = C(K)1.
Local Solutions of Weakly Parabolic Quasilinear Differential Equations
Authors: Dreher Michael , Pluschke Volker 
Published: November 2010

AbstractWe consider a quasilinear parabolic boundary value problem, the elliptic part of which degenerates near the boundary. In order to solve this problem, we approximate it by a system of linear degenerate elliptic boundary value problems by means of semidiscretization with respect to time. We use the theory of degenerate elliptic operators and weighted Sobolev spaces to find a priori estimates for the solutions of the approximating problems. These solutions converge to a local solution, if the step size of the time‐discretization goes to zero. It is worth pointing out that we do not require any growth conditions on the nonlinear coefficients and right‐hand side, since we lire able to prove L∞ ‐ estimates.
Compléments à un Résultat de Safarevic
Authors: Maire Christian 
Published: November 2010

AbstractSoient k un corps de nombres et p un nombre premier; notons par L la p‐extension maximale de k non‐ramifiée et non‐complexifiée, et par G le groupe de Galois Gal(L/k). On se propose alors de montrer dans la continuité de travaux de Safarevic, lorsque G est fini, l'existence d'un isomorphisme entre H2 (G,FP) et un certain groupe de nombres de k.
Fréchet Algebra Techniques for Boundary Value Problems on Noncompact Manifolds: Fredholm Criteria and Functional Calculus via Spectral Invariance
Authors: Schrohe Elmar 
Published: November 2010

AbstractA Boutet de Monvel type calculus is developed for boundary value problems on (possibly) noncompact manifolds. It is based on a class of weighted symbols and Sobolev spaces. If the underlying manifold is compact, one recovers the standard calculus. The following is proven:The algebra G of Green operators of order and type zero is a spectrally invariant Fréchet subalgebra of L(H), Ha suitable Hilbert space, i. e.,equation imageFocusing on the elements of order and type zero is no restriction since there are order reducing operators within the calculus.There is a necessary and sufficient criterion for the Fredholm property of boundary value problems, based on the invertibility of symbols modulo lower order symbols, andThere is a holomorphic functional calculus for the elements ofGin several complex variables.
A Class of Index Transforms with General Kernels
Authors: Yakubovich S. B. , Fisher Brian 
Published: November 2010

AbstractThis paper deals with a class of integral transforms of the non ‐ convolution type involving sufficiently general kernels, which depend upon two essentially independent arguments. One of them, in various particular cases, is a parameter or index of the corresponding special functions. This class of integral transforms comprises the famous Kontorovich‐Lebedev and Mehler‐Fock transforms. We study here the mapping properties and give also inversion theorems of the general index transforms on the space Lp(ℝ), p ≥ 1, that covers the respective measurable functions on the whole real axis with the norm

It is shown that the images of the transforms belong to the space Lν, p(ℝ+), νε ℝ, 1 ≤ p ≤ ∞ of functions normed by

In particular, when v = 1/p we get the usual Lp(ℝ+) space. We also direct our attention to the case of the Hilbert space and give certain interesting examples of these transforms.
Norm Closures of Operator Algebras with Symbolic Structure
Authors: Mantlik Frank 
Published: November 2010

AbstractWe investigate norm closures of operator algebras with symbolic structure in an axiomatic setting. Typical examples are given by algebras of zero order pseudodifferential operators on (possibly noncompact) manifolds. It is our aim to study properties of the completed algebras by means of the associated extensions of the symbolic calculus. Particularly we like to prove spectral Invariance or even the ϕ‐property in the sense of B. Gramsch and to discuss some of the main Implications.
A Spectrum Determined by Eigencurves
Authors: Binding Paul , Volkmer Hans 
Published: November 2010

AbstractThis paper investigates the self‐adjoint operator ‐∂2/∂x2 + q(x, y) in the Hilbert space L2((a, b)× (c,d)) subject to the boundary conditions z(a,y) = z(b,y) = 0. It is shown that the spectrum and spectral representation of A are determined by the eigencurves and eigenfunctions of the parameterized regular Sturm‐Liouville operator ‐d2/dx2+ q(x,y).
Spectral Properties of Some Semi ‐ Elliptic Operators in Lp
Authors: Shevchik Vitali 
Published: November 2010

AbstractSpectral properties of the semi‐elliptic operator
equation image
in Lp (1 < p < ∞) spaces are investigated. In particular it is proved that there exists μ0 such that if μ> μ0, then Aμ, P has the point spectrum and λk(Aμ, P) ˜ where Aμ, P is the unbounded operator generated by Aμ in Lp and λ k (Aμ,P) its eigenvalues.
Formes Quadratiques de Dimension 6
Authors: Laghribi Ahmed 
Published: November 2010

AbstractLet F be a field of characteristic not equal to 2 and ϕ be an anisotropic quadratic form of dimension 6 and signed discriminant d ≠ 1 such that ϕ F (√d) is anisotropic, Using a generic method, we give a complete characterization of quadratic forms ψ of dimension greater than or equal to 4 such that ϕ becomes isotropic over the function field of the projective quadric defined by the equation ψ = 0 (if dim ψ = 4, we must assume d ±
equation image
{1,d ±ϕ}). This method.also allows us to recover the results of D. W. Hoffmann [9], [10] in dimension 5, 6. This settles the study of isotropy of 6‐dimensional quadratic forms over the function field of a quadric, except for the cases:1) ϕ F(√ d) is isotropic but not hyperbolic and ψ has dimension 4 but is not similar to a 2‐fold Pfister form.2) ϕ F(√ d) is anisotropic, dim ψ = 4 and d±ϕ = d±ψ.
Local Spectra and Index of Singular Integral Operators with Piecewise Continuous Coefficients on Composed Curves
Authors: Bishop C. J. , Böttcher A. , Karlovich Yu. I. , Spitkovsky I. 
Published: November 2010

AbstractWe establish a symbol calculus for deciding whether singular integral operators with piecewise continuous coefficients are Fredholm on the Lebesgue space Lp(Γ W) where 1 < p < ∞, Γ is a composed Carleson curve, and W is a Muckenhoupt weight in the class Ap(Γ). We also provide index formulas for the operators in the closed algebra of singular integral operators with piecewise continuous matrix‐valued coefficients. Our main theorem is based upon three pillars: on the identification of the local spectrum of the Cauchy singular integral operator at the endpoints of simple Carleson arcs, on an appropriate “N projections theorem”, and on results of geometric function theory pertaining to the problem of extending Carleson curves and Muckenhoupt weights.
Isotropy of Virtual Albert Forms over Function Fields of Quadrics
Authors: Izhboldin Oleg , Karpenko Nikita 
Published: November 2010

AbstractLet F be a field of characteristic different from 2 and let ϕ be a virtual Albert form over F, i.e., an anisotropic 6‐dimensional quadratic form over F which is still anisotropic over the field \documentclass{article}\pagestyle{empty}\begin{document}$F\left({\sqrt {d \pm \varphi } } \right).$\end{document} We give a complete description of the quadratic forms Ψ such that ϕ becomes isotropic over the function field F(Ψ). This completes the series of works ([H6], [Lag6], [Lag], [Lee], [M2]) where the question was considered previously.
An Inverse Function Theorem for Fréchet Spaces Satisfying a Smoothing Property and (DN)
Authors: Poppenberg Markus 
Published: November 2010

AbstractClassical inverse function theorems of Nash‐Moser type are proved for Fréchet spaces that admit smoothing operators as introduced by Nash. In this note an inverse function theorem is proved for Fréchet spaces which only have to satisfy the condition (DN) of Vogt and the smoothing property (SΩ)t; for instance, any Fréchet‐Hilbert space which is an (Ω)‐space in standard form has property (SΩ)t. The main result of this paper generalizes a theorem of Lojasiewicz and Zehnder. It can be applied to the space C∞(K) if the compact K ⊂ ℝN is the closure of its interior and subanalytic; different from classical results the boundary of K may have singularities like cusps. The growth assumptions on the mappings are formulated in terms of the weighted multiseminorms [ ]m,k introduced in this paper; nonlinear smooth partial differential operators on C∞(K) and their derivatives satisfy these formal assumptions.
Toughening of in situ polymerized cyclic butylene terephthalate by addition of tetrahydrofuran
Authors: Abt Tobias , Sánchez‐Soto Miguel , Illescas Silvia , Aurrekoetxea Jon , Sarrionandia Mariasun 
Published: November 2010

AbstractA new method of toughening polymerized cyclic butylene terephthalate (pCBT) with tetrahydrofuran (THF) is proposed. The pCBT was prepared by in situ ring‐opening polymerization of a commercial cyclic butylene terephthalate, a cyclic form of poly(butylene terephthalate), in the presence of THF. In comparison to conventionally polymerized pCBT, the resultant material was found to be ductile, showing a strain at break of well above 100% in tensile tests. Other matrix properties, such as tensile modulus, tensile strength and glass transition temperature, were not significantly altered by the addition of THF. It was found that the presence of THF enhanced the polymerization reaction, resulting in an increased molecular weight and a narrowed molecular weight distribution. Moreover, remaining oligomers after polymerization were extracted by the THF and a toughened oligomer‐free pCBT was obtained. The influence of time and temperature on the long‐time toughening action of THF was studied. The results showed that samples became brittle after 3 months when subjected to a temperature of 80 °C, resulting in a reduction of the toughening action. Copyright © 2010 Society of Chemical Industry