bluuebunny/crossref_metadata_2025_split huggingface dataset:
Streptomyces maghwi, a new species producing roflamycoin
Authors: Afzal M. , Nimer N. D. , Nazar M. 
Published: June 2010

AbstractA new Streptomyces species is described for which the name S. maghwi is proposed. The organism is characterized by a pink mass of aerial mycelium, spiral spore chains, spores with smooth surfaces and a nonchromogenic vegetative mycelium. S. maghwi produces roflamycoin (SCHLEGEL et al. 1981) formerly known as flavomycoin (SCHLEGEL et al. 1971). The type strain of S. maghwi is deposited with CBS, Netherland.
A comparison of manganese oxidation by growing and resting cells of a freshwater bacterial isolate, strain FMn 1
Authors: Zapkin M. A. , Ehrlich H. L. 
Published: June 2010

AbstractA bacterial isolate, strain FMn 1, from reservoir sediment oxidized Mn2+ when tested in growing culture and resting‐cell suspension. The oxidation was biologically mediated and not the result of autoxidation because at a MnSO4 · H2O concentration of 0.05%. The pH remained below 7.5 for the duration of the experiments. The productions of manganese oxide was qualitatively and quantitatively demonstrated. Teh manganese‐oxidizing activity of this organism was found to be inducible.
A novel Mn2+‐oxidizing enzyme system in a freshwater bacterium
Authors: Zindulis J. , Ehrlich H. L. 
Published: June 2010

AbstractManganese oxidation by cell suspensions and cell extracts of a freshwater bacterium, designated strain FMn 1, was investigated. Manganese appeared to be oxidized in the periplasmic space. A conventional, membrane‐bound electron transport system was not utilized. An enzyme or enzyme complex and a cofactor, each of different molecular size, were located in different parts of the cell envelope. Results suggest that the cofactor reacts with manganese in the periplasmic space and that in the presence of oxygen it is reoxidized by the reoxidized by the enzyme. The enzyme is probably loosely bound to the membrane. A combination of enzyme and cofactor in a crude preparation exhibited a pH optimum at around 7.0. The enzyme exhibited a temperature optimum at around 30 °C. No temperature optimum was found for the cofactor. The enzyme was heat‐labile and inhibited by mercuric chloride and para‐chloromercuribenzoate. The cofactor was heat‐stable and could oxidize manganese under anaerobic conditions. The enzyme system appears to be different from others so far described.
Molekularbiologie der Keimung von Bacillus‐Sporen
Authors: Hecker M. 
Published: June 2010

The review deals with recent results and problems of gene expression during germination of Bacillus spores. Three problems were selected:
The activation of metabolism as a prequisite for the synthesis of nucleic acids and proteins.
The activation of nucleic acid and protein synthesis during germination.
The gene expression programme of germinating spores.

Using the highly sensitive two‐dimensional polyacrylamide gel analysis three major classes of proteins were distinguished, depending on the time of onset and duration of their syntheses:
proteins made throughout germination (main class)
proteins whose synthesis started only after a lag phase and then continued thoughout germination, and
proteins which are synthesized only during the early phases of germination.

The programme of protein synthesis is an indicatoir for the control of gene expression during germination. The regulation of expression of these major gene groups during spore outgrowth is discussed.
Micro‐Raman analysis of GaAs Schottky barrier solar cell
Authors: Jothilakshmi R. , Ramakrishnan V. , Kumar J. , Sarua Andrei , Kuball Martin 
Published: June 2010

AbstractGallium arsenide (GaAs) cells have been in the race with silicon single‐crystal cells for the highest efficiency photovoltaic devices. The annealed, irradiated Schottky barrier (SB) solar cells were characterised using micro‐Raman spectroscopy at three different regions: namely, at the (1) ohmic contact region, (2) unirradiated region and (3) irradiated region. We also present a micro‐Raman study of the damage process in annealed GaAs SB solar cells bombarded by high‐energy ions. A Gaussian line shape was fitted to the Raman spectra of the longitudinal optical phonon A1(LO), and parameters such as intensity, full width at half maximum (FWHM) and the area under the peak were obtained for the different annealing temperatures. Biaxial stress (σ), carrier concentration (n), depletion length (Ld), dislocation velocity (ν) and life time of the first‐order optical phonon (τ) of the A1(LO) mode of the irradiated region of the samples annealed at different temperatures were calculated. Copyright © 2010 John Wiley & Sons, Ltd.
Preparation of silver nanoparticles on zinc oxide nanowires by photocatalytic reduction for use in surface‐enhanced Raman scattering measurements
Authors: Chen I‐Cherng , Liou Yen‐Chen Maggie , Yang Jyisy , Shieh Tien‐Yu 
Published: June 2010

AbstractTo increase the sensitivity in surface‐enhanced Raman scattering (SERS) measurements, the high surface area of zinc oxide nanowires (ZnO NWs) was used. ZnO NWs on silicon substrates were prepared and used as substrates for further growth of silver nanoparticles (AgNPs). Ultraviolet (UV) irradiation was used to reduce silver ions to AgNPs on the ZnO wires. With proper growth conditions for both ZnO NWs and AgNPs, the substrates exhibit SERS enhancement factors greater than 106. To understand the influences of the morphologies of the ZnO NWs on the growth of AgNPs, the growing time and temperature were varied. The concentration of silver nitrate and irradiation time of UV radiation were also varied. The resulting AgNPs were probed with para‐nitrothiophenol to quantify the SERS enhancements obtained from the varying conditions. The results indicate that ZnO NWs could be grown at temperatures higher than 490 °C and higher growth temperatures result in smaller diameter of the formed ZnO NWs. Also, the morphologies of ZnO NWs did not significantly alter the SERS signals. The concentration of silver nitrate affects the SERS signals significantly and the optimal concentration was found to be in the range of 10–20 mM. With irradiation times longer than 90 s, the resulting AgNPs showed similar SERS intensities. With optimized conditions, the AgNPs/ZnO substrates are highly suitable for SERS measurements with a typical enhancement factor of higher than 106. Copyright © 2010 John Wiley & Sons, Ltd.
Inhibition of acid‐induced decomposition of diphenyltriazenes by complexation with cyclodextrins
Authors: Xu Tingting , Asadi Atefeh Vaez‐Zadeh , Barra Mónica 
Published: June 2010

AbstractAcid‐promoted NN bond cleavage in 1,3‐diphenyltriazenes (X‐Ph‐N=N‐NH‐Ph‐X; X = H, 4‐OCH3), leading to formation of diazonium ions and anilines, is strongly inhibited in aqueous solutions in the presence of cyclodextrins (CDs). The inhibition is ascribed to the formation of inclusion complexes that render the guest diphenyltriazene significantly less basic as a result of the less polar nature of the CD cavity (a microsolvent effect). Association equilibrium constants for 1:1 host–guest complexes increase in the order α‐CD <β‐CD ∼ permethyl‐β‐CD < hydroxypropyl‐β‐CD, with values for X = 4‐OCH3 being larger than those for X = H. In the case of α‐CD, formation of 2:1 host–guest complexes is also involved. © 2010 Wiley Periodicals, Inc. Int J Chem Kinet 42: 567–574, 2010
Production and nutritional aspects of human milk fat substitutes
Authors: Mu Huiling 
Published: June 2010

AbstractHuman milk fat substitute (HMFS), one of the vital ingredients of infant formula, constitutes about 50% of energy intake for many infants. The composition of HMFS depends on the raw material and the production technology. Both human and animal studies have shown that absorption of fats and minerals are affected by triacylglycerol structures and fatty acid compositions of HMFS. Additionally, the level of other micronutrients, such as fat‐soluble vitamins, can also be affected by production processes. The ultimate goal in the design of infant formula is to mimic human milk, regarding both lipids and other micronutrients. This paper covers human milk fat and selected HMFS as well as their impact on absorption of fat and calcium and illustrates recent progresses and findings.
Soybean Peroxidase Catalyzed Enzymatic Synthesis of Pyrrole/EDOT Copolymers
Authors: Tewari Arti , Kokil Akshay , Ravichandran Sethumadhavan , Nagarajan Subhalakshmi , Bouldin Ryan , Samuelson Lynne A. , Nagarajan Ramaswamy , Kumar Jayant 
Published: June 2010

AbstractPyrrole/EDOT copolymers were synthesized using environmentally benign enzyme catalysis. PSS was used as the solubilizing template and charge‐balancing dopant. Soybean peroxidase was utilized as a catalyst for the copolymerization reactions to yield poly(pyrrole‐EDOT)/PSS complex. Systematic studies were conducted with varying monomer feed ratios, temperature, and pH. Here we report for the first time, the enzyme catalyzed polymerization of pyrrole and EDOT at an elevated pH = 5. The polymer composition was determined using X‐ray photoelectron spectroscopy. Spectroscopic characterization [UV‐Vis, FTIR], thermal analysis, and electrical conductivity measurements for these complexes indicated the formation of stable conducting copolymers.magnified image
Electrospinning of Cellulose‐Based Fibers From NaOH/Urea Aqueous System
Authors: Qi Haisong , Sui Xiaofeng , Yuan Jinying , Wei Yen , Zhang Lina 
Published: June 2010

AbstractCellulose‐based fibers were prepared by electrospinning from cellulose dissolved in NaOH/urea in the presence of a small amount of polyol binders. The as‐spun products were examined with SEM. Pure cellulose solution did not produce fibrous materials, because it often formed spherical nanoparticles with diameters ranging from 100 to 300 nm. However, bicomponent fibrous materials were obtained successfully from mixtures of cellulose and HMPEG or PVA by electrospinning. The cellulose/HMPEG electrospun fibers had average diameters of 400 nm. The content of NaOH and urea as well as the stiffness of cellulose chains were found to have significant effect on the electrospinning process.
magnified image
Rothe's Method for Semilinear Parabolic Problems with Degeneration
Authors: Pluschke Volker 
Published: June 2010

AbstractThe paper deals with semilinear parabolic initial‐boundary value problems whereat the coefficient g(x, t) of the time derivative may vanish at a set of zero measure. Existence of a local weak solution of the problem is proved by means of semidiscretization in time. In order to omit a growth limitation for the nonlinearity we derive uniform boundedness of the approximates in L∞ (QT). Moreover, the weak solution turns out to be continuous even in the points of degeneration.
Left K‐Completeness in Quasi‐Metric Spaces
Authors: Romaguera Salvador 
Published: June 2010

AbstractRegular left K‐sequentially complete quasi‐metric spaces are characterized. We deduce that these spaces are complete Aronszajn and that every metrizable space admitting a left K‐sequentially complete quasi‐metric is completely metrizable. We also characterize quasi‐metric spaces having a quasi‐metric left K‐sequential completion in terms of certain bases of countable order.
Schauder Estimates for the Single Layer Potential in Hydrodynamics
Authors: Deuring Paul , Varnhorn Werner 
Published: June 2010

AbstractLet Ω be an open set in ℝN(N ⩾ 3), with compact boundary ϑΩ of type C1,α(ϵ(0,1)). We show that the single layer potential Ef, related to the stationary Stokes system on Ω, belongs to C1,α(ϑΩ)N, provided the source density f belongs to Cα(ϑΩ)N. In addition, we prove a related estimate of the function E(f)ϑΩ and its tangential derivatives.
Meromorphic Factorization, Partial Index Estimates and Elastodynamic Diffraction Problems1)
Authors: Câmara M. C. , Lebre A. B. , Speck F.‐O. 
Published: June 2010

AbstractThis work is motivated by some elliptic boundary and transmission problems in mathematical physics, in particular by elastodynamic wave propagation. The analytical solution of the boundary pseudodifferential equations requires a generalized factorization of the lifted Fourier symbol which is a non‐rational matrix‐function. In the factorization procedure poles and increasing terms appear, and cause enormous practical and theoretical problems due to the possible occurance of partial indices different from zero. The paper presents an approach which avoids those difficulties by use of a factorization of the symbol matrix into meromorphic factors. An operator theoretic interpretation yields resolvents up to finite dimensional operators, whose ranks are closely related to partial indices, order of the algebraic increase at infinity, and the multiplicities of the poles in the factors.
Classification of Twistor Spaces with a Pencil of Surfaces of Degree 1, Part I
Authors: Kurke Herbert 
Published: June 2010

AbstractWe display a family of compact complex 3‐manifolds which yields all twistor spaces containing a pencil of surfaces transversal to the twistor lines. This also yields explicit families of self‐dual metrics on connected sums of complex projective planes. This yields a completely alternative approach to a class of such metrics which was recently found by Claude le Brun [11].
On Cuspidal Cohomology of Arithmetic Groups and Cyclic Base Change
Authors: Rohlfs Jürgen , Speh Birgit 
Published: June 2010

AbstractLet F be a totally real number field and let E|F be a cyclic Galois extension with Galois group generated by σ. Let G0|F be a connected semi simple algebraic group defined over F, put G = res ℚ(G0 x FE) and assume that G0(F ⊗ ℝ) contains a compact Cartan. Let Y be the locally symmetric space which is determined by G(ℝ) and by a sufficiently small σ‐stable arithmetic subgroup Γ of G(ℚ). Then we show that the cuspidal cohomology of Y is non trivial. Moreover we give an estimate of the growth of the cuspidal cohomology if Γ shrinks to {e} in a certain way.
The Stieltjes Moment Problem with Complex Exponents
Authors: Duran Antonio J. 
Published: June 2010

AbstractIn this paper, we characterize the complex sequences (zn)n which satisfy the following condition: For each complex sequence (an)n, there exists a function f such that the functions tznf(t) are Lebesgue integrable and an = ∫ tznf(t)(dt) for all n∫. In this case, we give for every sequence (an)n infinitely many C∫ functions f satisfying some growth conditions in x = 0 and x = + ∫, and such that an = ∫ tznf(t)dt.Finally, we extend this result for Banach space valued functions.
λ‐Variation and Hausdorff Distance
Authors: Prus‐Wiśniowski Franciszek 
Published: June 2010

AbstractIt is shown that points of varying monotonicity of a function play an important role in calculation of its λ‐variation. It is proven that for a given continuous function x: [0,1] → IR of bounded λ‐variation, the function A → λ‐var(x, A) is continuous on the metric space (ℋ︁, dH) of all closed subsets of [0, 1] with Hausdorff distance. Another function from (ℋ︁, dH) into ℛ is used to characterize the compactness in CΛBVc, i.e. in the Banach space of continuous functions that are continuous in λ‐variation. As a corollary the separability of CΛABVc is proven.
Estimates on Complex Interactions in Phase Space
Authors: Martinez André 
Published: June 2010

AbstractWe propose a method to study the complex interactions (or microlocal tunneling) between electronic levels that do not intersect in the real domain. The method consists in using a special kind of Fourier‐Bros‐Iagolnitzer transformation, and in adjoining an exponential weight to the L2‐type Hilbert spaces which are associated to a complex Lagrangian manifold and have been introduced by Helffer and Sjöstrand for the study of resonances.
Sharp Generalized Carleman Inequalities with Minimal Information about the Spectrum
Authors: Dechevski Ljubomir T. , Persson Lars Erik 
Published: June 2010

AbstractLet H and T: H → H denote a separable Hilbert space and an operator in a Schatten‐von Neumann ideal Sp(H), respectively. Consider the resolvent operator (λI ‐ T)−1, where I is the identity operator and λ belongs to the resolvent set of T. Some sharp bounds for the uniform operator norm of (λI ‐ T)−1 are derived in some situations of particular interest for certain applications, namely when only partial or minimal information about the spectrum is available. The results obtained may also be regarded as generalizations of Carleman's inequality for quasinilpotent operators.
Entropy Numbers in Weighted Function Spaces and Eigenvalue Distributions of Some Degenerate Pseudodifferential Operators II
Authors: Haroske Dorothee , Triebel Hans 
Published: June 2010

AbstractThis paper is the continuation of [17]. We investigate mapping and spectral properties of pseudodifferential operators of type Ψ with χ χ ϵ ℝ and 0 ≤ γ ≤ 1 in the weighted function spaces B (ℝn, w(x)) and F (ℝn, w(x)) treated in [17]. Furthermore, we study the distribution of eigenvalues and the behaviour of corresponding root spaces for degenerate pseudodifferential operators preferably of type b2(x) b(x, D) b1(x), where b1(x) and b2(x) are appropriate functions and b(x, D) ϵ Ψ. Finally, on the basis of the Birman‐Schwinger principle, we deal with the “negative spectrum” (bound states) of related symmetric operators in L2.
On Multifunctionals in the Musielak‐Orlicz Spaces of Multifunctions
Authors: Kasperski Andrzej 
Published: June 2010

AbstractWe introduce the notions of Xd,s(x),φ‐linear multifunctional and Xd,s(x),φ‐linear continuous multifunctional. We generalize the theorems on linear bounded functionals in the Musielak‐Orlicz space.
Riesz Means on Compact Riemannian Symmetric Spaces
Authors: Li Luoqing 
Published: June 2010

AbstractWe study approximation properties of the Riesz means on compact symmetric spaces of rank one. To do so we establish equivalences between the Riesz means and Peetre K‐moduli and estimate the weak type and the uniform approximation of the Riesz means at the critical index. The relations between the Riesz means and the best approximation as well as the Cesàro means are also considered.
Filter Functions with Exponential Convergence Order
Authors: Denk Robert 
Published: June 2010

AbstractOversampled functions can be evaluated using generalized sinc‐series and filter functions connected with these series. A standard filter function is given by exp ((ζ2 − 1)−1). We show that the Fourier transform of this filter posseses the convergence order 0(exp (−√x)), improving an estimation given in [10]. Moreover, we define a family of filter functions with convergence order O(x · exp (−xσ)) with σ arbitrary close to 1.
Stochastic Integration for Some Rough Non‐adapted Processes
Authors: Imkeller Peter , Schmidt Wolfgang 
Published: June 2010

AbstractFor the Wiener process W on the unit interval and 0 ⩽ θ ⩽ 1/4 consider the non‐adapted process ut =sgn(Wt−θ)sgn(W1−WT+θ), θ⩽t⩽1−θ. By giving explicit descriptions of their expansions in terms of generalized Hermite polynomials we show that they possess Skorohod integral processes. In the more interesting case θ = 0, a component due to the interaction of forwards and backwards Wiener process seems to dominate the non‐interaction part, whereas for θ > 0 interaction drops geometrically with respect to non‐interaction. We translate these purely analytic properties into more familiar terms of samples of stochastic processes. Firstly, we construct simple approximations of the integral process which are of the type of Riemann sums. We then show that their quadratic variations are the same as for the Wiener process on [θ, 1 − θ]. Finally, using the fact that W remains a semimartingale if its filtration is enlarged by W1, we compare the resulting Ito integral process to the Skorohod integral process of u in case θ = 0. We show that they differ by a local time. Consequently the Skorohod integral process of u is a semimartingale.
Unitary Representations and Coadjoint Orbits for a Group of Germs of Real Analytic Diffeomorphisms
Authors: Leitenberger Frank 
Published: June 2010

AbstractThe method of coadjoint orbits is developed for the group of real analytic germs of diffeomorphisms φ with φ(0) = 0 and φ′(0) = 1. The form of all infinite dimensional coadjoint orbits is described. Classes U of unitary representations are constructed. In the case n = 2 these representations are related to coadjoint orbits.
Infinite Iterated Function Systems
Authors: Fernau Henning 
Published: June 2010

AbstractWe examine iterated function systems consisting of a countably infinite number of contracting mappings (IIFS). We state results analogous to the well‐known case of finitely many mappings (IFS). Moreover, we show that IIFS can be approximated by appropriately chosen IFS both in terms of Hausdorff distance and of Hausdorff dimension. Comparing the descriptive power of IFS and IIFS as mechanisms defining closed and bounded sets, we show that IIFS are strictly more powerful than IFS. On the other hand, there are closed and bounded non‐empty sets not describable by IIFS.
Bounded Solutions of Dynamical Systems in the Plane under the Conditions of Instability
Authors: Kalas J. , Osička J. 
Published: June 2010

AbstractIn this paper the asymptotic behaviour of the solutions of x' = A(t)x + h(t,x) under the assumptions of instability is studied, A(t) and h(t,x) being a square matrix and a vector function, respectively. The conditions for the existence of bounded solutions or solutions tending to the origin as t → ∞ are obtained. The method: the system is recasted to an equation with complex conjugate coordinates and this equation is studied by means of a suitable Lyapunov function and by virtue of the Wazevski topological method. Applications to a nonlinear differential equation of the second order are given.
On the Exact Values and Bilateral Estimates of Certain Capacities
Authors: Kalyabin Gennadiy 
Published: June 2010

AbstractThe quantities v(E) of combinatorical nature introduced by YU. V. Netrusov and equivalent to the capacities with respect to generalized Besov and Triebel‐Lizorkin spaces (Bp.q(β,N)(Rn) and Fp.q(β,N)(Rn)) are studied.It is shown that for q = p three exists the fast algorithm of calculating v(E) for E being the arbitrary finite union of elementary bricks.The simple general upper estimate for capacity of the compact sets is established which appeared to be bilateral for regular structures (such as lattices and convex sets).
Random Polytopes and Affine Surface Area
Authors: Schütt Carsten 
Published: June 2010

AbstractLet K be a convex body in Rd. A random polytope is the convex hull [x1, …, xn] of finitely many points chosen at random in K. IE(K, n) is the expectation of the volume of a random polytope of n randomly chosen points. I. Bárány showed that we have for convex bodies with C3 boundary and everywhere positive curvature

where x(x) denotes the Gauß‐Kronecker curvature. We show that the same formula holds for all convex bodies if x(x) denotes the generalized Gauß‐Kronecker curvature.
Valuing weather radar benefits for winter road maintenance: A practical case example
Authors: Smith Keith , Vick Sandra D 
Published: June 2010

AbstractA simple decision‐analysis model is used to determine the financial benefits accruing to one highway authority in Scotland from the use of weather radar imagery for u‐inter‐road‐maintenance operations. Over a three‐month period, the savings are some £23 000 greater than the benefits derived from the use of the particular OPEN ROAD forecast service employed by that authority.
Operational monitoring and forecasting of mesoscale weather phenomena in ocean regions surrounding Norway
Authors: Sunde J. , Rønting B. , Breivik L. A. , Midtbø K. H. , Ulstad C. 
Published: June 2010

AbstractA description is given of the operational system used by the Norwegian Meteorological Institute (DNMI) to monitor and forecast mesoscale weather phenomena. The system uses a combination of conventional observations, data from polar orbiting satellites (this includes cloud images and information about sea‐ice concentrations, sea‐surface temperatures arid surface winds) and output from the Limited Area Model. A case study involving mesoscale developments, which used output from the operational system, is described.