bluuebunny/crossref_metadata_2025_split huggingface dataset:
Description of a new endemic species of shrew (Mammalia, Soricomorpha) from PrÍncipe Island (Gulf of Guinea)
Authors: Ceríaco Luis M.P. , Marques Mariana P. , Jacquet François , Nicolas Violaine , Colyn Marc , Denys Christiane , Sardinha Patrícia C. , Bastos-Silveira Cristiane 
Published: March 2015

AbstractSão Tomé and Príncipe are unique islands off the Gulf of Guinea on account of the high degree of endemism in these areas due to isolation. These islands are known to harbor, among others, two species of shrews of the genus
Redetermination of the crystal structure of nitridodichlorido bis(triphenylphosphane) rhenium(V), at 200 K – Localization of hydrogen atoms, C36H30Cl2NP2Re
Authors: Schoultz Xandri , Gerber Thomas I. A. , Hosten Eric C. , Betz Richard 
Published: March 2015

Abstract C36H30Cl2NP2Re, monoclinic, I2/a (no. 15), a = 15.5631(4) Å, b = 9.5180(3) Å, c = 22.0872(9) Å, β = 103.237(1)°, V = 3184.9 Å3, Z = 4, Rgt(F) = 0.0203, wRref(F2) = 0.0419, T = 200 K.
Crystal structure of 4-propyl-3-methyl-1-phenyl-2-pyrazolin-5-one thiosemicarbazone, C15H19N5OS
Authors: Idemudia Omoruyi G. , Sadimenko Alexander P. , Hosten Eric C. 
Published: March 2015

Abstract C15H19N5OS, monoclinic, P21/c (no. 14), a = 12.2308(3) Å, b = 8.2628(2) Å, c = 16.3598(4) Å, β = 102.190(1)°, V = 1616.1 Å3, Z = 4, Rgt(F) = 0.0316, wRref(F2) = 0.0908, T = 200 K.
Preparation of poly(aspartic acid) superabsorbent hydrogels by solvent-free processes
Authors: Meng Hongyu , Zhang Xin , Chen Qiuchi , Wei Jun , Wang Yang , Dong An , Yang Haiyuan , Tan Tianwei , Cao Hui 
Published: March 2015

Abstract
Poly(aspartic acid) (PASP) hydrogel is a biodegradable and biocompatible polymer with high water absorbing ability. Traditionally, the production of PASP hydrogel consumes large amounts of organic solvents, i.e., dimethylformamide (DMF) or dimethyl sulfoxide (DMSO). This traditional approach is now considered costly, complex and environmentally unfriendly due to required used solvent disposal. The present research explores two novel methods in preparing PASP hydrogel without organic solvent, by using hydrazine hydrate and ethylene glycol diglycidyl ether (EGDGE) or poly(ethylene glycol) diglycidyl ether (PEGDGE) as the cross-linkers. Absorbent ability and other characteristics are determined. Preparing PASP hydrogel in aqueous solution is promising and finds its use in many applications.
Post-thyroidectomy hypocalcemia exacerbated by chyle leak
Authors: Alzaman Naweed , Pittas Anastassios G , O'Leary Miriam , Ceglia Lisa 
Published: March 2015

Summary
Transient hypocalcemia after thyroidectomy is not uncommon and the risk increases with the extent of neck surgery. We report a case of severe and prolonged hypocalcemia after total thyroidectomy complicated by thoracic duct injury. Hypoparathyroidism and thoracic duct injury are potential complications following total thyroidectomy with extensive lymph node dissection. This case suggested that having both conditions may complicate treatment of hypoparathyroid-induced hypocalcemia by way of losses of calcium and vitamin D in the chyle leak.

Learning points

This report highlights chyle leak as an uncommon cause of prolonged hypocalcemia in patients who have undergone extensive neck surgery.

Chyle has an electrolyte concentration similar to that of plasma.

Medical treatment options for a chyle leak include fat-free oral diet or parenteral nutrition without oral intake, pharmacological treatment (primarily octreotide).
Multiple Phosphatases Regulate Carbon Source-Dependent Germination and Primary Metabolism inAspergillus nidulans
Authors: de Assis Leandro José , Ries Laure Nicolas Annick , Savoldi Marcela , Dinamarco Taisa Magnani , Goldman Gustavo Henrique , Brown Neil Andrew 
Published: March 2015

AbstractAspergillus nidulans is an important mold and a model system for the study of fungal cell biology. In addition, invasive A. nidulans pulmonary infections are common in humans with chronic granulomatous disease. The morphological and biochemical transition from dormant conidia into active, growing, filamentous hyphae requires the coordination of numerous biosynthetic, developmental, and metabolic processes. The present study exhibited the diversity of roles performed by seven phosphatases in regulating cell cycle, development, and metabolism in response to glucose and alternative carbon sources. The identified phosphatases highlighted the importance of several signaling pathways regulating filamentous growth, the action of the pyruvate dehydrogenase complex as a metabolic switch controlling carbon usage, and the identification of the key function performed by the α-ketoglutarate dehydrogenase during germination. These novel insights into the fundamental roles of numerous phosphatases in germination and carbon sensing have provided new avenues of research into the identification of inhibitors of fungal germination, with implications for the food, feed, and pharmaceutical industries.
Synthesis and Physicochemical Characterization of New Polythiophenes Based on Three Different Monomers
Authors: Guzmán-Rabadán Karla K. , Ramírez-Gómez Marco A. , Güizado-Rodríguez Marisol , Guerrero-Álvarez Jorge A. , Barba Víctor , Basurto-Pensado Miguel A. , Galindo Rosario , Rodríguez Mario , Maldonado José L. 
Published: March 2015

ABSTRACTThe chemical synthesis of the copolymers poly(3-HT-co-EDOT-co-fluorene) and poly(3-HT-co-EDOT-co-TDR1) is reported. The first copolymer is derived of 3-hexylthiophene (3-HT), 3,4-ethylenedioxythiophene (EDOT) and 2,2'- (9,9-dioctyl-9H-fluorene-2,7-diyl) bisthiophene (fluorene). The second copolymer is derived of 3-hexylthiophene (3-HT), 3,4-ethylenedioxythiophene (EDOT) and (E)-2-(ethyl(4-((4-nitrophenyl)diazenyl)phenyl)amino)ethyl 2-(thiophen-3-yl)acetate (TDR1). Their physicochemical characterization by 1H NMR, FT-IR, DSC-TGA, GPC, UV-vis, cyclic voltammetry was carried out. These copolymers combine the high electron density and low oxidation potential of EDOT with the high charge mobility and processability of 3-HT. These are candidates for applications as active or barrier layer in electronic devices (bulk heterojuntion organic solar cells) or as functional membranes (e.g., sensors).
Morphological Properties of Hyperbranched Compound Containing Pyrrole Units
Authors: Fomina Lioudmila , Sánchez Jorge Godínez , Olivares José A. , Cuppo Sant´Anna Fabio L. , Sansores Luis E. , Salcedo Roberto 
Published: March 2015

ABSTRACTHyperbranched structures containing pyrrole units were obtained from ortho-, meta- and para-diaminodiphenyldiacetylenes as AB2 type monomers by one-step polymerization.The para-hyperbranched compound was observed by optical microscopy and scanning electron microscopy.Microscopy studies identify two phases. The first is the insoluble one which gives origin to flake type structures. The second is acetone soluble phase, which generated crystalline structure manifesting in optic anisotropy and rhomboids and triangles dendrimeric structures.
Influence of Core-Shell Architecture Parameters on Thermal Conductivity of Si-Ge Nanowires
Authors: Sarikurt Sevil , Sevik Cem , Kinaci Alper , Haskins Justin B. , Cagin Tahir 
Published: March 2015

ABSTRACTIn this work, we investigate the influence of the core-shell architecture on nanowire (1D) thermal conductivity targeting to evaluate its validity as a strategy to achieve a better thermoelectric performance. To obtain the thermal conductivity values, equilibrium molecular dynamic simulations is applied to Si and Ge systems that are chosen to form core-shell nanostructures. To explore the parameter space, we have calculated thermal conductivity values of the Si-core/Ge-shell and Ge-core/Si-shell nanowires at different temperatures for different cross-sectional sizes and different core contents. Our results indicate that (1) increasing the cross-sectional area of pristine Si and pristine Ge nanowire increases the thermal conductivity (2) increasing the Ge core size in the Si-core/Ge-shell structure results in a decrease in the thermal conductivity values at 300 K (3) thermal conductivity of the Si-core/Ge-shell nanowires demonstrates a minima at specific core size (4) no significant variation in the thermal conductivity observed in nanowires for temperature values larger than 300 K (5) the predicted thermal conductivity around 10 W m−1K−1 for the Si and Ge core-shell architecture is still high to get desired ZT values for thermoelectric applications. On the other hand, significant decrease in thermal conductivity with respect to bulk thermal conductivity of materials and pristine nanowires proves that employing core–shell architectures for other possible thermoelectric material candidates would serve valuable opportunities to achieve a better thermoelectric performance.
MOCVD of SnSx thin films for solar cell application
Authors: Clayton Andrew J. , Irvine Stuart J. C. , Barrioz Vincent , Masciullo Alessia 
Published: March 2015

ABSTRACTAn inline metal organic chemical vapor deposition system was used to deposit tin sulfide at temperatures >500 °C. Tetramethyltin was used as the tin source and diethyldisulfide as the sulfur source. An overhead injector configuration was used delivering both precursors directly over the substrate. The tin and sulfur precursors were premixed before injection to improve chemical reaction in the gas phase. Growth temperatures 500 – 540 °C were employed producing films with approximate 1:1 stoichiometry of Sn and S detected by energy dispersive x-ray spectroscopy. X-ray diffraction showed there to be mixed phases with Sn2S3 present with SnS.
Defect engineering in AlGaN-based UV optoelectronic heterostructures grown on c-Al2O3 by plasma-assisted molecular beam epitaxy
Authors: Rouvimov Sergei , Jmerik Valentin N. , Nechaev Dmitrii V. , Ratnikov Valentin V. , Toropov Alexey A. , Shevchenko Eugenii A. , Brunkov Pavel N. , Rzheutski Mikolai V. , Lutsenko Eugenii V. , Ivanov Sergey V. 
Published: March 2015

ABSTRACTAlGaN-based SQW heterostructures grown by plasma-assisted molecular beam epitaxy on c-Al2O3 substrates have been studied with high resolution transmission electron microscopy (HR TEM), photoluminescence spectroscopy and x-ray diffraction. The high-temperature (780°C) synthesis of the AlN buffer layer nucleated on c-Al2O3 by a migration enhanced epitaxy and including several ultra-thin GaN interlayers grown under moderate N-rich conditions was shown to be the optimum approach for lowering the threading dislocations density down to 108-109 cm-2. HR TEM study has confirmed the fine structure of single quantum wells (SQW) formed by a sub-monolayer digital alloying technique and revealed different kinds of compositional inhomogeneities in the AlxGa1-xN barrier layers of the heterostructures, including the formation of Al-rich barriers induced by the temperature-modulated epitaxy and the spontaneous compositional disordering along the growth axis for x=0.6-0.7. The influence of these phenomena on the parameters of the mid-UV stimulated emission observed in the SQW structures has been studied as well.
Changes in selected subpopulations of lymphocytes in dogs infected with Babesia canis treated with imidocarb
Authors: Jarosz Ł. , Kalinowski M. , Staniec M. , Grądzki Z. , Salmons B. , Winiarczyk S. , Adaszek Ł. 
Published: March 2015

SummaryObjective: The purpose of this study was to track changes in selected subpopulations of lymphocytes in the blood of dogs infected with Babesia (B.) canis and treated with imidocarb. Material and methods: The study included 16 dogs divided into two groups. The first group (n = 6) consisted of healthy control animals. Dogs of the second group (n = 10) were infected with B. canis and after establishment of the diagnosis each animal received a single dose of imidocarb (5 mg/kg). Flow cytometry was used to enumerate several immune cell phenotypes. Results: It was concluded that the invasion of B. canis contributes to the decreased percentage of CD3+, CD4+, CD8+, CD21+ lymphocytes in the blood of infected animals. The decreased level of tested subpopulations of lymphocytes in group 2 persisted for the entire 12-day period of the test. After the administration of imidocarb, each tested lymphocyte fraction in the blood of the dogs with babesiosis increased, but did not reach physiological values. Conclusion: The presented results indicate that the resolution of clinical signs associated with babesiosis may be related to the stimulation and intensity of cellular immunity, dependent on the CD4+ T cells profile. After administration of imidocarb, the parasitemia is cleared which allows the recovery of the lymphocyte populations.
Magnetresonanztomographie und Laparoskopie zur Diagnose und Behandlung eines Ovarrest-Syndroms bei einer Hündin
Authors: Krauss M. , Krauss Z. 
Published: March 2015

ZusammenfassungBei einer 6-jährigen Pointer-Hündin mit periodisch auftretender Läufigkeitssymptomatik nach erfolgter Ovariohysterektomie wurde Ovarrest-Gewebe diagnostiziert. Die Diagnose basierte auf vaginoskopischer und vaginalzytologischer Befunderhebung, einer Serumprogesteronanalyse und einer magnetresonanztomographischen Untersuchung. Über eine Laparoskopie wurde das verbliebene Ovargewebe mithilfe eines Versiegelungsgeräts minimalinvasiv entfernt. Die Läufigkeitssymptomatik verschwand 14 Tage nach dem Eingriff.
P&A on a Deepwater Compliant Tower Asset Using Hydraulic Workover (HWO): Addressing the Challenges for Successful Execution
Authors: Sinno Ralph R. , Marretta Brocke P. , Randle Bryce E. 
Published: March 2015

Abstract
With the current government environmental directives in the Gulf of Mexico (GoM), operators are challenged to ensure that idle iron wells are correctly handled to meet regulatory requirements in the full abandonment of the wells and their platform structures. With this, there is a need to remove existing production tubulars and set the required abandonment barriers before removing the offshore structure. Because of the current operational climate, there are many challenges that operators face in the GoM with regards to their ability to secure rig set equipment and personnel to effectively perform these operations in an economic manner.
This paper details an operational challenge of preparing for the temporary abandonment of an operator's GoM compliant tower structure, where an existing wellbore had been shut in with an annulus containing sustained casing pressure up to 3,000 psi. To facilitate the operational work scope, a hydraulic workover (HWO) rig was selected to be installed to the compliant tower structure, which allowed for the successful removal of the completion and preparation for the impending platform abandonment process, all while simultaneously working under the operational constraints of a producing facility.
This publication shows that through the application of detailed engineering and operational programming, the challenges of adapting existing equipment, restrictions on available space, reduced deck load capacity, along with crane limitations, all before HWO operations in an offshore environment with the potential for severe weather on a compliant tower, were safely overcome while performing the operations.
Simulation of Formation Test for Reservoir Characterisation
Authors: Sanni Moshood O. , Aluko Olalekan A. , John-Nwosu Ebube , Ogbechie Aisha Z. , Eze Uchenna A. 
Published: March 2015

Abstract
This paper presents simultaneous prediction of pressure response and sample contamination profile in formation testers. This study is based on numerical simulation of snorkel (probe) flow aperture formation testers to capture hemi-ellipsoidal pressure diffusion and saturation changes around the snorkel and wellbore during formation testing.
For this purpose, formation tests with snorkel aperture were modelled using a three-dimensional (r-θ-z), single well, radial compositional numerical simulation model. The model incorporates dynamic and static mud filtrate invasion due to mud hydrostatic pressure; static mud cake; capillary pressure; filtrate-reservoir fluid miscibility and non radial symmetrical flow that characterises a snorkel flow around a wellbore.
The model was used to determine formation permeability/mobility using steady-state pretest and formation rate analysis (FRA) methods from simulated pressure response; reservoir radial and vertical permeabilities using simulated extended snorkel pump-out; and contamination prediction for water and oil based mud using simulated fluid sampling profile.
The study shows that a robust numerical simulation model that correctly captures the phenomenon that affects the dynamics of formation testers; predicts pressure diffusion and saturation changes around the formation tester in a wellbore during formation testing. This model is required for simultaneous prediction of pressure response and sample contamination in formation testers. This model can then be used for prediction of formation permeability; prediction of reservoir fluid sample contamination; computing geometric (shape) factors for formation testers; validating formation test interpretation results; and reservoir characterisation.
Sensitivity on numerical model grid size is important to determine the optimum grid size required for simultaneous prediction of pressure response and sample contamination in formation testers.
Currently in the industry, test design and simulation of snorkel-aperture formation testers are usually carried out using analytical pressure transient models and empirical sample contamination prediction models separately. Analytical pressure prediction models, often based on single phase or single phase equivalent, cannot be used for contamination prediction. This study has used numerical simulation to predict pressure transient and sample contamination profile, simultaneously.
A New Technique for Enhancing Hydraulic Fracturing Treatment in Unconventional Reservoirs
Authors: Keshavarz Alireza , Badalyan Alexander , Johnson Ray , Bedrikovetsky Pavel 
Published: March 2015

Abstract
A physical model and experimental data supporting the technology and benefits of graded proppant injection into naturally fractured reservoirs to stimulate natural fracture permeability has been developed recently. In this study, the graded proppant injection has been coupled with hydraulic fracturing treatment for enhancing conductivity of micro-fractures and cleats around the hydraulically induced fractures in coal bed methane reservoirs. In this technique, placing ultra-fine proppant particles in natural fractures and cleats around hydraulically induced fractures at leak-off conditions keeps the coal cleats open during water-gas production and consequently increases the efficiency of hydraulic fracturing treatment.
Experimental studies and mathematical modelling for stimulation of natural cleat system around the main hydraulic fracture are conducted. In the laboratory study, core flooding tests are performed to inject flow of suspended particles inside the natural fractures of a coal sample. By placing different particle sizes and evaluating concentration of placed particles, an experimental coefficient is found for optimum proppant placement in which the maximum permeability is achieved after proppant placement. In the mathematical modelling study, a laboratory based mathematical model for graded peroppant placement in naturally fractured rocks around a hydraulically induced fracture is proposed. Derivations of the model include exponential form of the pressure-permeability dependence and accounts for permeability variation in the non-stimulated zone. The explicit formulae are derived for well productivity index by including the experimentally found coefficient.
Particle placement tests result in almost three times increase in coal permeability. The laboratory-based mathematical modelling as performed for the field conditions shows that the proposed method yields around 6-times increase in productivity index.
A Systematic Approach to Uncertainty Reduction with a Probabilistic and Multi-Objective History Matching
Authors: Mesquita F.B. , Davolio A. , Schiozer D.J. 
Published: March 2015

Abstract
The petroleum industry has a high demand for production forecasting under uncertainties, which is performed through probabilistic approaches. Although these approaches have been used very often in recent years, one of the challenges to their application is the development of a methodology with multiple scenarios that honor the dynamic data available (history matching procedures). Many works, which propose different probabilistic history matching approaches have been published in the literature but are based on methods that demand a very high number of reservoir simulation runs. Thus, to make this type of application feasible, these methods rely on the application of proxy models, which, however, are not able to capture the full physical behavior of the model. Different from those methods, this work proposes a methodology for uncertainties reduction of reservoir properties integrated with an assisted history matching procedure, in a multi-objective approach that does not employ proxies.
The methodology proposed is an extension of a procedure previously published by our group, which has shown to be an efficient way to perform probabilistic history matching. At each iteration of the process, the model uncertainties are combined through a robust sampling technique, which originates a set of model realizations that are then simulated. The results are evaluated for all Objective Functions (OF), namely, the quadratic deviations of all well rates and pressures. This work proposes the use of quantitative tools to perform the matching: (1) indexes that quantify the matching quality for each OF and allow prioritizing the worst OF to be matched and (2) a bi-dimensional matrix that supports the identification of sources to the highest deviations and gradual model properties updating. At the end of the procedure, good models (which must present satisfactory matching for all OF) are filtered and further employed in production forecasting under uncertainties.
The methodology is applied to a synthetic model (UNISIM-I-H) based on the Namorado field in Brazil. The results show not only the gradual improvement of all OF during the matching procedure but also and, more importantly, how the reservoir uncertainties are updated based on the tools proposed here.
The proposed indicators make the application systematic and can be used for automatizing the process. The methodology is able to deal with complex cases, especially those involving several wells and uncertainties with non-linear interaction among them. The developments provide robustness to the application, resulting in a more reliable production forecast and management of the field.