bluuebunny/crossref_metadata_2025_split huggingface dataset:
Another approach to the evaluation of a certain multivariate compound distribution
Authors: Robe-Voinea Elena-Gratiela , Vernic Raluca 
Published: September 2017

Abstract
In this work, we consider the multivariate aggregate model introduced in [11], model that takes into account the case when different types of claims affect in the same time an insurance portfolio under some specific assumptions related to the number of claims. For the probability function of the corresponding multivariate compound distribution, [11] obtained an exact recursive formula proved using the properties of the probability generating function. In this paper, we present a new shorter proof of the same formula that we also extend to a new form. Moreover, we present an alternative approximate method to evaluate the compound distribution based on the Fourier transform, and we compare both methods on a numerical example.
Image Restoration using a Nonlinear Second-order Parabolic PDE-based Scheme
Authors: Barbu Tudor , Moroşanu Costică 
Published: September 2017

Abstract
A novel anisotropic diffusion-based image denoising and restoration approach is proposed in this paper. A variational model for image restoration is introduced first, then the corresponding Euler-Lagrange equation being determined. A nonlinear parabolic PDE model is then obtained from this equation. It is based on a novel edge-stopping function and conductance parameter. A serious mathematical treatment is performed on this second-order anisotropic diffusion scheme, its well-possedness being investigated. Then, a consistent explicit numerical approximation scheme based on the finite difference method is developed for the proposed PDE model.
Walrasian economy and some properties of convexly compact sets
Authors: Cristea Mirela , Dascălu Doina , Nasta Laura Nicoleta 
Published: September 2017

Abstract
G. Žitković defined the notion of a convexly compact set in a topological space and, among other things, used it to give an extension of the Walrasian excess-demand theorem. We continue the study of convexly compactness in LCS spaces and prove a Krein-Milman theorem in this setting.
Numerical Analysis of Transmission Lines Equation by new β-method Schemes
Authors: Allali Fatima , Alaa Nour Eddine , Ghammaz Abdelilah , Rouijaa Hicham 
Published: September 2017

Abstract
In this paper we develop a new β-method applied to the resolution of homogeneous transmission lines. A comparison with conventional methods used for this type of problems like FDTD method or classical β-method is also given. Furthermore, various numerical experiments are presented to confirm the accuracy, efficiency and stability of our proposed method. In particular, these simulations show that our new scheme is unconditionally stable and fourth-order accurate in space and time.
Almost principal ideals and tensor product of hyperlattices
Authors: Lashkenari A. Soltani , Davvaz B. 
Published: September 2017

Abstract
In this paper, by considering the notion of congruences on hyper- lattices we define almost principal ideals on hyperlattices. We investigate some properties and prove some results about them. Also, we define compatible functions on hyperlattices and investigate connection between these functions and almost principal ideals. Then, we define tensor product of two hyperlattices and present several properties such as completeness and distributivity on tensor product of hyperlattices.
Archimedean tiling graphs with Gallai’s property
Authors: Chang Zhikui , Yuan Liping 
Published: September 2017

Abstract
Gallai in 1966 raised the question about the existence of graphs with the property that every vertex is missed by some longest path. This property will be called Gallai’s property. In this paper we present some graphs embeddable into Archimedean tiling graphs, with both connectivity 1 and 2, satisfying Gallai’s property.
Best possible estimates of weak solutions of boundary value problems for quasi-linear elliptic equations in unbounded domains
Authors: Wiśniewski Damian 
Published: September 2017

Abstract
We investigate the behaviour of weak solutions of boundary value problems for quasi-linear elliptic divergence second order equations in unbounded domains. We show the boundedness of weak solutions to our problem. Using barrier function and applying the comparison principle, we find the exact exponent of weak solutions decreasing rate near the infinity.
Whistle-blowing and the employment relations implications of the ‘Protected Disclosures Act 2014’ in the Republic of Ireland
Authors: Halpin Lisa , Dundon Tony 
Published: September 2017

Abstract
This article explores the introduction of the 2014 Protected Disclosures Act in the Republic of Ireland. It does so by using a justice theory lens to examine the potential for the Act to protect workers who may feel the need to blow the whistle on employer wrongdoings. Data is collected from public records and documents, along with interviews with senior representatives from ‘all’ the social partner agents involved in drafting or contributing to the Act. The evidence suggests that the Act may have limited utility in ensuring fairness and justice for the whistle-blower. In particular, employers appear reluctant to embrace the idea of more legal protections, while cultural stigmas attached to the idea of ‘blowing the whistle’ may inhibit people coming forward. The article contributes to justice theory and employment regulation, as well as whistle-blowing practices, and some recommendations are suggested to improve awareness of whistle-blowing rights for workers.
Data-driven multichannel seismic impedance inversion with anisotropic total variation regularization
Authors: Wang Dehua , Gao Jinghuai , Zhou Hongan 
Published: September 2017

Abstract
Acoustic impedance (AI) inversion is a desirable tool to extract rock-physical properties from recorded seismic data. It plays an important role in seismic interpretation and reservoir characterization. When one of recursive inversion schemes is employed to obtain the AI, the spatial coherency of the estimated reflectivity section may be damaged through the trace-by-trace processing. Meanwhile, the results are sensitive to noise in the data or inaccuracies in the generated reflectivity function. To overcome the above disadvantages, in this paper, we propose a data-driven inversion scheme to directly invert the AI from seismic reflection data. We first explain in principle that the anisotropic total variation (ATV) regularization is more suitable for inverting the impedance with sharp interfaces than the total variation (TV) regularization, and then establish the nonlinear objective function of the AI model by using anisotropic total variation (ATV) regularization. Next, we solve the nonlinear impedance inversion problem via the alternating split Bregman iterative algorithm. Finally, we illustrate the performance of the proposed method and its robustness to noise with synthetic and real seismic data examples by comparing with the conventional methods.
Fast numerical method of solving 3D coefficient inverse problem for wave equation with integral data
Authors: Bakushinsky Anatoly B. , Leonov Alexander S. 
Published: September 2017

Abstract
An inverse coefficient problem for time-dependent wave
equation in three dimensions is under consideration. We are looking
for a spatially varying coefficient of this equation knowing special
time integrals of the wave field in an observation domain.
The inverse problem has applications to the reconstruction
of the refractive index of an inhomogeneous medium, as well as to acoustic
sounding, medical imaging, etc. In the article, a new linear three-dimensional Fredholm integral equation
of the first kind is introduced from which it is possible to find the unknown
coefficient. We present and substantiate a numerical algorithm for solving this integral
equation. The algorithm does not require significant computational
resources and a long solution time. It is based on the use
of fast Fourier transform under some a priori assumptions about
unknown coefficient and observation region of the wave
field. Typical results of solving this three-dimensional inverse problem on a
personal computer for simulated data demonstrate high
capabilities of the proposed algorithm.
Solution of the inverse elastography problem for parametric classes of inclusions with a posteriori error estimate
Authors: Leonov Alexander S. , Sharov Alexander N. , Yagola Anatoly G. 
Published: September 2017

Abstract
This article presents the solution of a special
inverse elastography problem: knowing vertical displacements of compressed
biological tissue to find a piecewise constant distribution of Young’s modulus in an investigated specimen. Our goal is to detect homogeneous inclusions in the tissue, which can be interpreted as oncological. To this end, we consider the specimen
as two-dimensional elastic solid, displacements of which satisfy the differential equations
of the linear static theory of elasticity in the plain strain statement.
The inclusions to be found are specified by parametric functions with unknown
geometric parameters and unknown Young’s modulus. Reducing this inverse problem
to the search for all unknown parameters, we solve it applying the modified method of
extending compacts by V. K. Ivanov and I. N. Dombrovskaya. A posteriori error
estimate is carried out for the obtained approximate solutions.
Carbohydrate-protein interactions characterized by dual polarization hybrid plasmonic waveguide
Authors: Chen Chen , Hou Xun , Si Jinhai 
Published: September 2017

Abstract
Optical biosensors present good performance for the affinity analysis of a molecular binding event. However, most of those excited with single optical mode are “blind” to the conformational change of bound molecules. We theoretically demonstrate a dual polarization hybrid plasmonic (DPHP) waveguide with nano-slots. By addressing the structure with dual polarizations, the optogeometrical properties (density and thickness) of protein layers have been determined without ambiguity. Differences in the hybrid mode dispersion between the transverse electric (TE) and transverse magnetic (TM) modes allow to separately determine the thickness and the density at all stages during the molecular interaction. In addition, nano-slots can be equated with an effective optical capacitance resulting in a strong field confinement; thereby, subtle changes in the ambient medium can be sensed. A proof of concept is conducted by analyzing the conformational change of HepV, a recombinant fragment of collagen V, during complicated molecular interaction. Integrated with adlayer thickness and density, we can conclude that a thick sparse layer formed after heparin capture and a thin dense layer arising from HepV bound. Accordingly, HepV undergoing conformational change has been traced and verified as molecular interaction occurs.
Localization of the Reversible Hydrogenase in Cyanobacteria
Authors: Kentemich Thomas , Bahnweg Margret , Mayer Frank , Bothe Hermann 
Published: September 2017

Abstract
The reversible hydrogenase of the cyanobacterium Anacystis nidulans was purified 250-fold by classical methods. Activity staining on gels obtained by native PAGE allowed to identify two bands. A ntibodies were raised against the electrophoretically homogeneous protein. The molecu­lar weight of the hydrogenase was determined by SD S-PAGE follow ed by Western blot analysis with these antibodies. Crude extracts from the unicellular Anacystis and from heterocysts and vegetative cells of Anabaena variabilis showed precipitation bands of 56 and 17 kd. The reversible hydrogenase appeared to be com posed o f a larger and a smaller subunit as the NiFeS-hydrogen-ases from other bacteria. The hydrogenase subunits, particularly the smaller on e, were subject to proteolysis. By application of the protein A-immuno-gold labeling technique the reversible hydro­ genase was shown to associate with the cytoplasmic membrane in Anacystis. When A nacystis was grown microaerobically, the increase in the specific activity of the reversible hydrogenase paral­leled the raise in the gold-labeling at the cell periphery as measured from the electron micro­ graphs. It is concluded that Anacystis has two different hydrogenases: the reversible or bidirec­tional hydrogenase which is located exclusively at the cytoplasmic membrane of the cells, and a thylakoid-bound enzyme which catalyzes only the uptake of H2.
The Active Species of "C02" Formed by Carbon Monoxide Dehydrogenase from Peptostreptococcus productus
Authors: Bott Michael , Thauer Rudolf K. 
Published: September 2017

Abstract
Carbon monoxide dehydrogenase of anaerobic bacteria catalyzes the reversible conversion of CO to "CO2" . With the enzyme from Peptostreptococcus productus it is shown that CO2 rather than HCO3
- (H2CO3) is the active species of "CO2" formed by this dehydrogenase.
The Primary Structures of the Core Antenna Polypeptides from Rhodopseudomonas marina
Authors: Brunisholz René A. , Bissig I. , Wagner-Huber R. , Frank G. , Suter F. , Niederer E. , Zuber H. 
Published: September 2017

Abstract
The antenna complex B 880 of Rp. marina has been isolated by applying ion-exchange chromatography on Whatman DE -52 resin and sucrose density centrifugation of LDAO-solubilized photosynthetic membranes. The antenna polypeptides B 880-α and B 880-β were pre­pared by organic solvent extraction of extensively dialyzed and freeze-dried B 880 antenna complex material or photosynthetic membranes. Gel filtration on Sephadex LH-60 and ion-exchange chromatography on Whatman DE -32 resin in the presence of organic solvents and an additional step on a C-8 reversed phase column yielded pure α-and β-apoproteins. Their complete primary structures have been elucidated using automated Edman degradation and carboxypeptidase diges­tion. According to quantitative Edman degradation the ratio of B 880-α and B 880-β has been determined as 1:1 in the isolated antenna complex as well as in the photosynthetic membrane. B 880-α of Rp. marina, presumably N -form ylated, consists of 52 amino acid residues and is 75, 56, 52 and 44% homologous to the corresponding core antenna polypeptides of Rs. rubrum, Rp. viridis, Rb. capsulatus and Rb. sphaeroides. In contrast, B 880-β (56 amino acid residues) is less homologous to the corresponding core β-antenna polypeptides of the same strains (57. 51. 41 and 42%). It shows an extended N-terminal domain as compared to the B 880-a polypeptide. Apart from the typical structural features of bacterial membrane-bound antenna polypeptides (three domain structure, His-residue in the hydrophobic stretch) the antenna polypeptides of Rp. marina are structurally related to polypeptides of core antenna complexes with strong near infra­red circular dichroism signals.
[125I]Azido-Ioxynil Labels Val249 of the Photosystem II D -1 Reaction Center Protein
Authors: Oettmeier Walter , Masson Klaus , Höhfeld Jörg 
Published: September 2017

Abstract
Azido-ioxynil (3,5-diiodo-2-azido-4-hydroxy-benzonitrile) is a potent photosystem II inhibitor (pI50-value 7.38) and as effective as the parent compound ioxynil itself. [125I]azido-ioxynil exhibits specific binding to isolated thylakoids with a binding constant Kb = 7.14. Upon UV -illumination it binds covalently to thylakoids or photosystem II particles. It labels predominantly the 32 kDa D-1 photosystem II reaction center protein . A 41 kDa protein is only tagged in trace amounts. After proteolytic treatment of labeled D -1 protein with Staphylococcus aureaus V8 -protease two major and two minor fragments are obtained. Automated gas phase sequencing of a 7 kDa cleavage peptide revealed that Val249 is the primary target of azido-ioxynil binding. Compared to urea type herbicides, this places the ioxynil binding site in a different environment of the D -1 photosystem II protein.
Topography of the Chloroplast Cytochrome b6: Orientation of the Cytochrome and Accessibility of the Lumen-Side Interhelix Loops
Authors: Szczepaniak A. , Black M. T. , Cramer W. A. 
Published: September 2017

Abstract
The to pography of chloroplast cytochromes f and b6 was probed with proteases carboxypeptidase A (CpA ), trypsin, and Staph, aureus V8. The cytochrome and its proteolytic products were detected by heme stain and, in most experiments, by immunoreaction. In thylakoids, the only protease that significantly affected the intactness of cytochrome f was CpA that caused a small (ΔMr = -1 - 2000) decrease in the apparent molecular weight. In SDS -treated thylakoids, both trypsin and V8 degraded cytochrome f. The inferred topography of cytochrom f , with the COOH -terminus on the stromal (n) side, one membrane-spanning a-helix n ear the COOH-terminus, and most of the Cyt f mass on the lumen (p) side, is consistent with that previously inferred by others. Cytochrome b6 was not sensitive to CpA . but was more sensitive to trypsin and V8 protease than cytochrome f , cytochrome b-559, or the 17 kDa OEC extrinsic protein. Trypsin caused a small decrease in size of cytochrome b6, which was observed using whole protein antibody as a single smaller band (ΔMr ≈ 2000) or two smaller discrete bands (ΔMr = -1000 and 2500, respectively) which, unlike the untreated protein , did not react with antibody generated to a peptide mimicking A sp-5 -Gln-14 near the NH2-terminus. These shorten ed tryptic fragments were attributed to cleavage after R-10 and K-23 n ear the NH2-terminus, implying an orientation with the NH2-terminus on the stromal side of the membrane. The sensitivity of cytochrome b6 toward this trypsin cleavage was increased if the membranes were first incubated with CpA , showing that the NH2 -terminal region of cytochrome b6 is masked by the COOH -terminal domain of one or more thylakoid proteins. Under conditions where degradation of cytochrome b-559, cytochrome f, or the 17 kDa OEC extrinsic protein on the lumen side of the membrane was small ( < 10-20% ). V8 protease degraded 80-90% of cytochrome b6. The main polypeptide fragment generated by V8 protease had an apparent molecular weight Mr = 16,000, reacted with antibody to a peptide mimicking Ala-146-Asp-155, and was more pronounced in membranes treated with SDS. The fragment could then result from cleavage at two sites, Glu-74 and /or Glu-166. It is concluded that the loop of cytochrome b6 protruding from the lumen side of the membrane between helices III and IV , and possibly that between helices I and II as w ell, contains a single Glu residue conferring a sensitivity to V8 protease greater than that of the lumen-side mass of cytochrome f which has many more Glu residues. This implies a lumen-skeletal structure in which one or two loops of cytochrome b6 on the lumen side are more exposed to the aqueous phase than cytochrome f.
Photophosphorylation as Function of ADP Concentration at Varying Transmembrane Proton Gradients
Authors: Heinen Georg , Strotmann Heinrich 
Published: September 2017

Abstract
Rates of photophosphorylation were measured at constant saturating phosphate concentration , varying ADP concentration , and varying light intensity. As the transmembrane proton gradient is decreased by phosphorylation to different extents depending on the concentration of ADP . rates of ATP formation obtained at the different ADP concentrations were plotted versus the actual steady state ΔpH (in the absence of ΔΨ) during the course of the reaction . ΔpH was monitored by the calibrated 9-aminoacridine fluorescence technique. In secondary plots phosphorylation as function of ADP concentration at different constant ΔpH values were obtained . The results indicate Michaelis-Menten kinetics. The true Km for ADP is virtually unaffected by ΔpH whereas Vmax (at ADP saturation ) strongly depends on ΔpH . The results are discussed in the framework of a simple enzyme kinetic model which considers the intrathylakoidal proton (at constant external pH ) as a third substrate for ATP formation. The model is capable o f explaining the reported results as well as a variety of important results from the literature.
Localization and Orientation of Subunit Delta of Spinach Chloroplast ATP-Synthase within the CF0 CF1 Complex 2. Identification of C-Terminal Residues of Delta, Exposed on the Thylakoid Membrane
Authors: Berzborn Richard J. , Finke Werner 
Published: September 2017

Abstract
The amino acid residues of spinach CF1 subunit delta are identified which are accessible and thus exposed within the quaternary structure of the ATP-synthase complex on the thylakoid membrane. Two types of antibodies in the monospecific polyclonal antiserum 306 against CF1, delta, described in the previous publication [Z. Naturforsch. 44c, 153 - 160 (1989)], were separated by virtue of their different affinity to thylakoid membranes and used for specific analysis of the products of proteolytic digestion of delta in situ. Polypeptide delta in situ, i.e. within the CF0C F1, complex on the membrane, is not susceptible to digestion by aminopeptidase M and trypsin, but is shortened by about 1 kDa by carboxypeptidase Y and digested at residues Glu173 and Glu179 by the Staphylococcus aureus protease V8 . The epitope on delta reacting with the agglutinating antibodies from serum 306 is lost after these proteolytical treatments and there fore situated on residues Met180-Val187. Since trypsin destroys this epitope only after prolonged incubation and with at least 50 μg trypsin/mg Chl, residue Lys169 of delta probably is inaccessible in situ. We conclude that the C -terminal am phipathic α-helix of spinach CF1 subunit delta is exposed on the thylakoid membrane, with the hydrophilic face directed to the outside, and th at CF1 delta starts to be shielded within the quaternary structure of the CF0CF1 complex between Glu173 and Lys169. The hydrophobic face of the c-terminal helix may be part of the binding surface towards CF0. Antibodies from serum 306 inhibit the PMS mediated cyclic photophosphorylation by reacting with C -terminal residues of δ.
Activation of a Chloroplast Type of Fructose Bisphosphatase from Chlamydomonas reinhardtii by Light-Mediated Agents
Authors: Huppe Heather C. , Buchanan Bob B. 
Published: September 2017

Abstract
A chloroplast type of fructose-1,6 -bisphosphatase, a central regulatory enzyme of photosynthetic carbon metabolism, has been partially purified from Chlamydomonas reinhardtii. Unlike its counterpart from spinach chloroplasts, the algal FBPase showed a strict requirement for a dithiol reductant irrespective of Mg2+ concentration. The enzymes from the two sources resembled each other immunologically, in subunit molecular mass and response to pH. In the presence of dithiothreitol, the pH optimum for both the algal and spinach enzymes shifted from 8.5 to a more physiological value of 8.0 as the Mg2+ concentration was increased from 1 to 16 mᴍ . At 1 mᴍ Mg2+, a concentration estimated to be close to physiological, the Chlamydomonas FBPase was active only in the presence of reduced thioredoxin and was most active with Chlamydomonas thioredoxin f. Under these conditions, the enzyme showed a pH optimum of 8.0. The data suggest that the Chlamydomonas enzyme resembles its spinach counterpart in most respects, but it has a stricter requirement for reduction and less strict reductant specificity. A comparison of the prop­erties of the FBPases from Chlamydomonas and spinach will be helpful for elucidating the mechanism of the reductive activation of this enzyme.