bluuebunny/crossref_metadata_2025_split huggingface dataset:
In‐capillary non‐covalent labeling and determination of tomato systemin with quantum dots in capillary electrophoresis with laser‐induced fluorescence detection
Authors: Bai Yu , Du Fuyou , Yang Youyou , Bai Yu , Liu Huwei 
Published: September 2011

AbstractQuantum dots (QDs), with their superior size‐dependent fluorescence properties, have been employed as non‐covalent fluorescent labels for the determination of tomato systemin (TomSys) by capillary electrophoresis with laser‐induced fluorescence (CE‐LIF) detection. The optimum conditions of in‐capillary labeling and CE separation were investigated in detail, and complete separation of QDs‐labeled TomSys from free QDs labels was achieved. Satisfactory results were obtained in terms of linearity (R2=0.998), sensitivity (limit of detection, 66 fmol) and repeatability (run‐to‐run RSDs of migration time and peak area, 0.9 and 4.6%, respectively; day‐to‐day RSDs of migration time and peak area, 3.1 and 11.9%, respectively). The established CE‐LIF method was later applied in the detection of TomSys spiked in the sample of tomato leaves, which showed the applicability of the proposed method in the analysis of the target plant peptide hormone in the complex matrix.
Preparation of Microporous Melamine‐based Polymer Networks in an Anhydrous High‐Temperature Miniemulsion
Authors: Schwab Matthias Georg , Crespy Daniel , Feng Xinliang , Landfester Katharina , Müllen Klaus 
Published: September 2011

AbstractWe report the first example of a successful preparation of a microporous organic polymer within the droplet phase of an inverse non‐aqueous miniemulsion. Stable nanoparticles with enhanced specific surface area could be obtained despite the harsh conditions regarding reaction temperature (180 °C) and time (72 h) needed for building melamine‐based Schiff base networks. Our new flexible method can in principle be applied to other water‐sensitive protocols suitable for the bulk synthesis of MOPs that are based on Friedel‐Crafts, Sonogashira‐Hagihara or Yamamoto chemistry.
Peripheral neuropathy in HIV patients: Treatment by decompression of peripheral nerves
Authors: Wolfort Sean F. , Dellon A. Lee 
Published: September 2011

AbstractPeripheral neuropathy is the most common nerve disorder in human immunodeficiency virus (HIV) patients. Distal symmetrical sensory polyneuropathy (DSP) affects roughly one third of HIV patients. With the introduction of antiretrovirals, more patients are surviving longer, and chronic complications are surfacing. Three consecutive patients with at least a 5‐year history of HIV presented during the period from 2007 to 2009. All three patients were on antiretrovirals and had no other comorbid conditions such as spinal pathology or diabetes. All patients had symptoms of pain, numbness, and weakness. Quantitative sensory testing and/or electromyography/nerve conduction testing (EMG/NCT) were performed preoperatively and correlated with the presence of Tinel signs. Targeted nerve releases were performed in four extremities, for a total of 18 nerves. All three patients had symptomatic improvement at 1 year with a visual analog scale (VAS) reduction in pain by at least five points. Quantitative sensory testing showed improvement, as did two EMG/NCTs obtained postoperatively. This showed improvement in conduction velocity at the fibular tunnel and posterior tibial nerve at the tarsal tunnel. This is the first report of nerve decompressions in the lower and upper extremity of HIV patients in the literature outside of the median nerve in the carpal tunnel. © 2011 Wiley‐Liss, Inc. Microsurgery, 2012.
17O NMR studies of substituted 1,3,4‐oxadiazoles
Authors: Gierczyk Błażej , Zalas Maciej , Kaźmierczak Marcin , Grajewski Jakub , Pankiewicz Radosław , Wyrzykiewicz Bożena 
Published: September 2011

AbstractThree series of substituted 1,3,4‐oxadiazoles were studied by 17O NMR spectroscopy. Chemical shifts values were correlated with empirical Hammett parameters as well as calculated bond lengths and chemical shielding values. Copyright © 2011 John Wiley & Sons, Ltd.
Use of Computed Tomography and Three‐Dimensional Virtual Reconstruction for the Examination of a 16th Century Mummified Dog from a North German Peat Bog
Authors: Gill‐Frerking H. , Rosendahl W. 
Published: September 2011

ABSTRACTThe corpse of a well‐preserved dog was recovered from a peat bog in the region of Burlage, Germany, in 1953. The dog, which dates to the 16th century, retained extensive soft tissue and fur on the postcranial body, although the head is skeletonised. Computed tomography was used to determine the extent of the preservation of the soft tissue, to determine sex and age and to attempt to identify trauma, pathology and potential cause of death. The analysis of the CT data indicated that the dog was an immature or adolescent male. Substantial soft tissue was preserved, including some internal organs. The entire skeleton was present, with the exception of the mandible and parts of the paws; all of the bones were flattened and some were distorted because of demineralisation in the peat. Partial disarticulation of the vertebral column was postmortem, although there was no further evidence of trauma or pathology on the skeleton or soft tissue. The cause of death could not be conclusively determined. To the knowledge of the authors, this dog represents the only known example of a complete historical nonhuman bog body with preserved soft tissue. Copyright © 2011 John Wiley & Sons, Ltd.
Splenomegaly unresponsive to standard and salvage chemotherapy in Langerhans cell histiocytosis: A case of extramedullary hematopoiesis
Authors: Christiansen Ellen C. , Ellwein Marcine , Neglia Joseph P. 
Published: September 2011

AbstractLangerhans cell histiocytosis (LCH) is a proliferative disorder of dendritic cells which has evaded efforts to clearly define pathogenesis, diagnostic criteria, and therapeutic response markers. Strides have been made at classification with the recent development of a quantified score of disease severity. Splenic involvement is an indicator of poor prognosis, with spleen size its surrogate marker in evaluation and scoring. We describe a case of pediatric LCH with progressive splenomegaly despite treatment, which when examined at splenectomy revealed no LCH involvement but extramedullary hematopoiesis. These findings thus challenge our understanding of splenomegaly as a marker of disease. Pediatr Blood Cancer 2012; 58: 998–999. © 2011 Wiley Periodicals, Inc.
Study design for a comprehensive assessment of biologic safety using multiple healthcare data systems
Authors: Herrinton Lisa J. , Curtis Jeffrey R. , Chen Lang , Liu Liyan , Delzell Elizabeth , Lewis James D. , Solomon Daniel H. , Griffin Marie R. , Ouellet‐Hellstom Rita , Beukelman Timothy , Grijalva Carlos G. , Haynes Kevin , Kuriya Bindee , Lii Joyce , Mitchel Ed , Patkar Nivedita , Rassen Jeremy , Winthrop Kevin L. , Nourjah Parivash , Saag Kenneth G. 
Published: September 2011

ABSTRACTBackgroundAlthough biologic treatments have excellent efficacy for many autoimmune diseases, safety concerns persist. Understanding the absolute and comparative risks of adverse events in patient and disease subpopulations is critical for optimal prescribing of biologics.PurposeThe Safety Assessment of Biologic Therapy collaborative was federally funded to provide robust estimates of rates and relative risks of adverse events among biologics users using data from national Medicaid and Medicare plus Medicaid dual‐eligible programs, Tennessee Medicaid, Kaiser Permanente, and state pharmaceutical assistance programs supplementing New Jersey and Pennsylvania Medicare programs. This report describes the organizational structure of the collaborative and the study population and methods.MethodsThis retrospective cohort study (1998–2007) examined risks of seven classes of adverse events in relation to biologic treatments prescribed for seven autoimmune diseases. Propensity scores were used to control for confounding and enabled pooling of individual‐level data across data systems while concealing personal health information. Cox proportional hazard modeling was used to analyze study hypotheses.ResultsThe cohort was composed of 159 000 subjects with rheumatic diseases, 33 000 with psoriasis, and 46 000 with inflammatory bowel disease. This report summarizes demographic characteristics and drug exposures. Separate reports will provide outcome definitions and estimated hazard ratios for adverse events.ConclusionThis comprehensive research will improve understanding of the safety of these treatments. The methods described may be useful to others planning similar evaluations. Copyright © 2011 John Wiley & Sons, Ltd.
Synthesis of ω‐sulfonated polystyrene via reversible addition fragmentation chain transfer polymerization and postpolymerization modification
Authors: Feng Lei , Cavicchi Kevin A. , Katzenmeyer Bryan C. , Wesdemiotis Chrys 
Published: September 2011

AbstractThe synthesis of chain‐end sulfonated polystyrene [PS (ω‐sulfonated PS)] by reversible addition fragmentation chain transfer (RAFT) polymerization followed by postpolymerization modification was investigated by two methods. In the first method, the polymer was converted to a thiol‐terminated polymer by aminolysis. This polymer was then sulfonated by oxidation of the thiol end‐group with m‐chloroperoxybenzoic acid (m‐CPBA) to produce a sulfonic acid end‐group. In the second method, the RAFT‐polymerized polymer was directly sulfonated by oxidation with m‐CPBA. After purification by column chromatography, ω‐sulfonated PS was obtained by both methods with greater than 95% end‐group functionality as measured by titration. The sulfonic acid end‐group could be neutralized with various ammonium or imidazolium counter ions through acid–base or ionic metathesis reactions. The effect of the ionic end‐groups on the glass transition temperature of the PS was found to be consistent with what is known for PS ionomers. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011
Thermal and pH responsive high molecular weight poly(urethane‐amine) with high urethane content
Authors: Gu Lin , Wang Xianhong , Chen Xuesi , Zhao Xiaojiang , Wang Fosong 
Published: September 2011

AbstractAliphatic poly(urethane‐amine) (PUA) was synthesized from copolymerization of CO2 and 2‐methylaziridine (MAZ) using Y(CCl3COO)3‐ZnEt2‐glycerine coordination catalyst, the urethane content of PUA was over 80%, and its yield could reach 90%. PUA with molecular weight as high as 31.0 kg/mol was obtained when the copolymerization reaction was carried out in N,N‐dimethylacetamide (DMAc), mainly due to the good solubility of PUA in DMAc. PUA exhibited reversible thermo‐responsive property in deionized water, and the lower critical solution temperature (LCST) was highly sensitive to its urethane content and molecular weight, which was observed in a broad window from 37 to 90 °C. Furthermore, the phase transition behavior could also be controlled by change of pH value. When the pH value of the PUA aqueous solution changed from 9.2 to 13, the LCST value of the solution decreased from 48.4 °C to 30 °C. Therefore, the PUA showed thermo‐ and pH‐ dual responsive performance in water. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011
Evaluation of model quality predictions in CASP9
Authors: Kryshtafovych Andriy , Fidelis Krzysztof , Tramontano Anna 
Published: September 2011

AbstractCASP has been assessing the state of the art in the a priori estimation of accuracy of protein structure prediction since 2006. The inclusion of model quality assessment category in CASP contributed to a rapid development of methods in this area. In the last experiment, 46 quality assessment groups tested their approaches to estimate the accuracy of protein models as a whole and/or on a per‐residue basis. We assessed the performance of these methods predominantly on the basis of the correlation between the predicted and observed quality of the models on both global and local scales. The ability of the methods to identify the models closest to the best one, to differentiate between good and bad models, and to identify well modeled regions was also analyzed. Our evaluations demonstrate that even though global quality assessment methods seem to approach perfection point (weighted average per‐target Pearson's correlation coefficients are as high as 0.97 for the best groups), there is still room for improvement. First, all top‐performing methods use consensus approaches to generate quality estimates, and this strategy has its own limitations. Second, the methods that are based on the analysis of individual models lag far behind clustering techniques and need a boost in performance. The methods for estimating per‐residue accuracy of models are less accurate than global quality assessment methods, with an average weighted per‐model correlation coefficient in the range of 0.63–0.72 for the best 10 groups. Proteins 2011; © 2011 Wiley‐Liss, Inc.
Prediction of protein secondary structure from circular dichroism using theoretically derived spectra
Authors: Louis‐Jeune Caroline , Andrade‐Navarro Miguel A. , Perez‐Iratxeta Carol 
Published: September 2011

AbstractCircular dichroism (CD) is a spectroscopic technique commonly used to investigate the structure of proteins. Major secondary structure types, alpha‐helices and beta‐strands, produce distinctive CD spectra. Thus, by comparing the CD spectrum of a protein of interest to a reference set consisting of CD spectra of proteins of known structure, predictive methods can estimate the secondary structure of the protein. Currently available methods, including K2D2, use such experimental CD reference sets, which are very small in size when compared to the number of tertiary structures available in the Protein Data Bank (PDB). Conversely, given a PDB structure, it is possible to predict a theoretical CD spectrum from it. The methodological framework for this calculation was established long ago but only recently a convenient implementation called DichroCalc has been developed. In this study, we set to determine whether theoretically derived spectra could be used as reference set for accurate CD based predictions of secondary structure. We used DichroCalc to calculate the theoretical CD spectra of a nonredundant set of structures representing most proteins in the PDB, and applied a straightforward approach for predicting protein secondary structure content using these theoretical CD spectra as reference set. We show that this method improves the predictions, particularly for the wavelength interval between 200 and 240 nm and for beta‐strand content. We have implemented this method, called K2D3, in a publicly accessible web server at http://www. ogic.ca/projects/k2d3. Proteins 2012. © 2011 Wiley Periodicals, Inc.
Surface‐histogram: A new shape descriptor for protein‐protein docking
Authors: Gu Shengyin , Koehl Patrice , Hass Joel , Amenta Nina 
Published: September 2011

AbstractDetermining the structure of protein–protein complexes remains a difficult and lengthy process, either by NMR or by X‐ray crystallography. Several computational methods based on docking have been developed to support and even serve as possible alternatives to these experimental methods. In this article, we introduce a new protein–protein docking algorithm, shDock, based on shape complementarity. We characterize the local geometry on each protein surface with a new shape descriptor, the surface‐histogram. We measure the complementarity between two surface‐histograms, one on each protein, using a modified Manhattan distance. When a match is found between two local protein surfaces, a model is generated for the protein complex, which is then scored by checking for collision between the two proteins. We have tested our algorithm on Version 3 of the ZDOCK protein–protein docking benchmark. We found that for 110 out of the 124 test cases of bound docking in the benchmark, our algorithm was able to generate a model in the top 3600 candidates for the protein complex within an root‐mean‐square deviation of 2.5 Å from its native structure. For unbound docking predictions, we found a model within 2.5 Å in the top 3600 models in 54 out of 124 test cases. A comparison with other shape‐based docking algorithms demonstrates that our approach gives significantly improved performance for both bound and unbound docking test cases. Proteins 2012; © 2011 Wiley Periodicals, Inc.
Target highlights in CASP9: Experimental target structures for the critical assessment of techniques for protein structure prediction
Authors: Kryshtafovych Andriy , Moult John , Bartual Sergio G. , Bazan J. Fernando , Berman Helen , Casteel Darren E. , Christodoulou Evangelos , Everett John K. , Hausmann Jens , Heidebrecht Tatjana , Hills Tanya , Hui Raymond , Hunt John F. , Seetharaman Jayaraman , Joachimiak Andrzej , Kennedy Michael A. , Kim Choel , Lingel Andreas , Michalska Karolina , Montelione Gaetano T. , Otero José M. , Perrakis Anastassis , Pizarro Juan C. , van Raaij Mark J. , Ramelot Theresa A. , Rousseau Francois , Tong Liang , Wernimont Amy K. , Young Jasmine , Schwede Torsten 
Published: September 2011

AbstractOne goal of the CASP community wide experiment on the critical assessment of techniques for protein structure prediction is to identify the current state of the art in protein structure prediction and modeling. A fundamental principle of CASP is blind prediction on a set of relevant protein targets, that is, the participating computational methods are tested on a common set of experimental target proteins, for which the experimental structures are not known at the time of modeling. Therefore, the CASP experiment would not have been possible without broad support of the experimental protein structural biology community. In this article, several experimental groups discuss the structures of the proteins which they provided as prediction targets for CASP9, highlighting structural and functional peculiarities of these structures: the long tail fiber protein gp37 from bacteriophage T4, the cyclic GMP‐dependent protein kinase Iβ dimerization/docking domain, the ectodomain of the JTB (jumping translocation breakpoint) transmembrane receptor, Autotaxin in complex with an inhibitor, the DNA‐binding J‐binding protein 1 domain essential for biosynthesis and maintenance of DNA base‐J (β‐D‐glucosyl‐hydroxymethyluracil) in Trypanosoma and Leishmania, an so far uncharacterized 73 residue domain from Ruminococcus gnavus with a fold typical for PDZ‐like domains, a domain from the phycobilisome core‐membrane linker phycobiliprotein ApcE from Synechocystis, the heat shock protein 90 activators PFC0360w and PFC0270w from Plasmodium falciparum, and 2‐oxo‐3‐deoxygalactonate kinase from Klebsiella pneumoniae. Proteins 2011; © 2011 Wiley‐Liss, Inc.
Assessing resilience engineering based on safety culture and managerial factors
Authors: Shirali G.H.A. , Mohammadfam I. , Motamedzade M. , Ebrahimipour, V. , Moghimbeigi A. 
Published: September 2011

AbstractResilience engineering (RE) is the inherent capacity of a plant to cope with complex and unexpected events. The real challenge for RE is to recognize that complex systems are dynamic and that dynamic systems may sometimes change from a state of dynamic stability into a state of dynamic instability. This article explores RE based on safety culture indicators and managerial factors. In a plant survey we measured seven safety culture indicators and four management factors that are known to influence RE. We describe a simple survey method that can be used to identify deficiencies related to RE. For example, we found three major problems; that is, (a) poor safety training, (b) poor management of change, and (c) poor attitudes (looking for scapegoats and placing production ahead of safety). © 2011 American Institute of Chemical Engineers Process Saf Prog, 2012
High resolution X‐ray absorption on metallicity selected C60 peapods, single‐, and double walled carbon nanotubes
Authors: Kramberger Christian , Ayala Paola , Shiozawa Hidetsugu , Simon Ferenc , Friedrich Alexander , Liu Xianjie , Rümmeli Mark , Miyata Yasumitsu , Kataura Hiromichi , Hoffmann Patrick , Pichler Thomas 
Published: September 2011

AbstractWe have investigated the C1s core level X‐ray absorption of bulk samples of C60‐peapods and double wall carbon nanotubes (DWNTs) derived from either metallic or semiconducting single‐walled carbon nanotubes (SWNTs). The clear cut separation of the different species unveils their distinct electronic van Hove singularities (VHS). The core level spectra of peapods are a quantitative superpositon of the conduction band of nanotubes and unoccupied molecular orbitals of C60. The outer shell metallicity selected DWNTs reveal changes in the π* resonance due to the inner shell VHS.
Raman study of nanotube–substrate interaction using single‐wall carbon nanotubes grown on crystalline quartz
Authors: Soares Jaqueline S. , Barros Eduardo B. , Shadmi Nitzan , Joselevich Ernesto , Jorio Ado 
Published: September 2011

AbstractIn this work, we have studied the resonance Raman spectra of 17 single‐wall carbon nanotube (SWNT) serpentines, using a 532 nm laser. Each serpentine consists of a series of straight, parallel, and regularly spaced segments, connected by alternating U‐turns formed on top of crystalline miscut quartz. The interaction between the SWNT and the substrate affects the properties of nanotubes, generating different behaviors of the G‐band. We observed variations in the G‐band frequency along the SWNTs, which can be organized into three different groups, as a result of different types of interaction with the substrate, generated during the deposition of the SWNTs.
Ultrasonic Sealing of Flexible Packaging Films – Principle and Characteristics of an Alternative Sealing Method
Authors: Bach Sascha , Thürling Karsten , Majschak Jens‐Peter 
Published: September 2011

The closure process for packaging is a key process. It ensures the protective function of packaging and assures the packaged goods a long life. In this context, efficient and reliable sealing processes are essential for the production of sustainable packages.In this paper, several characteristics of the ultrasonic sealing process will be discussed and accompanied by experimental results. The introduction provides an insight into the ultrasonic sealing process, its heating mechanisms and the process steps. A comparison is made with conduction sealing. Furthermore, basic principles of heating and energy dissipation are related to the influences of the sealing parameters on the seam strength. The experimental studies were carried out on typical packaging films, such as polyamide‐polyethylene laminates. The seam strength in ultrasonic sealing is compared with that in conductive sealing. A lower seam strength was found for ultrasonic sealing in all the tested films. Furthermore, the sealing behaviour of the packaging films contaminated with different kinds of foods was analysed for both sealing methods. Although the ultrasonic sealing method has marginal advantages for bulk materials such as wheat flour, conduction sealing was shown to be better for other products. A comparison of the energy consumption during the ultrasonic and conduction sealing verified the advantages of ultrasonic sealing. In particular for thick packaging films, the amount of energy required for bonding is significantly lower than for conduction sealing.In summary, this paper provides a survey of the characteristics of the ultrasonic sealing method in packaging applications – its advantages and limitations. Copyright © 2011 John Wiley & Sons, Ltd.