bluuebunny/crossref_metadata_2025_split huggingface dataset:
Rapid analysis of constituents of Radix Cyathulae using hydrophilic interaction‐reverse phase LC‐MS
Authors: Ren Mei‐Ting , Li Hui‐Jun , Sheng Long‐Sheng , Liu Peng , Li Ping 
Published: October 2009

AbstractA hydrophilic interaction chromatography (HILIC) and reverse‐phase liquid chromatography (RPLC) coupled with electrospray TOF MS method was developed for the analysis and characterization of constituents in the radix of Cyathula officinalis Kuan. Separation parameters of HILIC such as buffer pH, mobile phase strength, and organic modifier were evaluated. Fructose, glucose, and sucrose were identified by HILIC‐ESI/TOF MS. Reverse‐phase liquid chromatography‐ESI/TOF MS were applied for quick and sensitive identification of major saponins in Cyathula officinalis. In‐source collision‐induced dissociation has been performed to elucidate the fragmentation pathways of oleanane‐, hederagenin‐, and gypsogmin‐type saponins. Twelve saponins were characterized in this plant for the first time, and four of them were presumed to be new compounds. In addition, one phytoecdysteroid (cyasterone) and one coumarin (6,7‐dimethoxycoumarin) were detected at the same time. The present method was capable of rapid characterizing and providing structure information of constituents from herbal drugs.
LC method for the analysis of kanamycin residue in swine tissues using derivatization with 9‐fluorenylmethyl chloroformate
Authors: Chen Yiqiang , Chen Qian , Tang Shusheng , Xiao Xilong 
Published: October 2009

AbstractA sensitive and robust HPLC method was developed for the determination of kanamycin (Kan) in swine tissues. Kan was extracted from tissue with 10% TCA (w/v) solution and cleaned up with MCX SPE column. The purified extract was derivatized with 9‐fluorenylmethyl chloroformate, and then separated on a C18 column and detected by a fluorescence detector. The linear range of the calibration curve was 0.025–1 μg/mL with R2 of 0.9998. The limits of quantification were determined to be 0.1 mg/kg in muscle, 0.2 mg/kg in liver, and 0.6 mg/kg in kidney, and the average recoveries of Kan from swine tissues at different fortification levels (0.1–0.4 mg/kg for muscle, 0.2–1.2 mg/kg for liver, and 0.6–5.0 mg/kg for kidney) ranged from 80.7 to 91.3% with intraday and interday coefficient of variations less than 12.1%. The validated method was successfully applied to determine Kan in incurred samples, indicating that it can be used as a routine tool for the surveillance of Kan residue in swine tissues.
MR metabolomics of fecal extracts: applications in the study of bowel diseases
Authors: Bezabeh Tedros , Somorjai Ray L. , Smith Ian C. P. 
Published: October 2009

AbstractNMR‐based metabolomics is becoming a useful tool in the study of body fluids and has a strong potential to contribute to disease diagnosis. While applications on urine and serum have been the focus to date, there are a number of other body fluids that are readily available and could potentially be used for metabolomics‐based disease diagnosis. One such body fluid is stool or fecal extract. Given its contact with and transient stay in the colon and rectum, stool carries a lot of useful information regarding the health/disease status of both the colon and the rectum. This could be particularly useful for the non‐invasive diagnosis of colorectal cancer and inflammatory bowel disease—the two bowel diseases that are very common and pose significant public health problems. Different methodological considerations including the collection of sample, the storage of sample, the preparation of sample, NMR acquisition parameters, experimental conditions and data analysis methods are discussed. Results obtained in the detection of colorectal cancer and in the differentiation of the two major forms of inflammatory bowel disease (i.e. ulcerative colitis and Crohn's disease) are presented. This is concluded with a brief discussion on the future of MR metabolomics of fecal extracts. Copyright © 2009 Crown in the right of Canada. Published by John Wiley & Sons, Ltd
Insertion heuristics for central cycle problems
Authors: Lamb John D. 
Published: October 2009

AbstractA central cycle problem requires a cycle that is reasonably short and keeps the maximum distance from any node not on the cycle to its nearest node on the cycle reasonably low. The objective may be to minimize maximum distance or cycle length. Most classes of central cycle problems are NP‐hard. This article investigates insertion heuristics for central cycle problems, drawing on insertion heuristics for p centers and travelling salesman tours. It shows that a modified farthest insertion heuristic has reasonable worst‐case bounds. It then compares the performance of two farthest insertion heuristics on a range of problems from TSPLIB. It shows that a simple farthest insertion heuristic performs well in practice. © 2009 Wiley Periodicals, Inc. NETWORKS, 2010
On the connectivity of semiregular cages
Authors: Balbuena C. , González‐Moreno D. , Marcote X. 
Published: October 2009

AbstractAn ({r, r + 1}; g)‐cage is a graph with degree set {r, r + 1}, girth g, and with the smallest possible order; every such graph is called a semiregular cage. In this article, semiregular cages are shown to be maximally edge‐connected and 2‐connected. As a consequence, ({3, 4}; g)‐cages are proved to be maximally connected. © 2009 Wiley Periodicals, Inc. NETWORKS, 2010
Network flow spanners
Authors: Dragan Feodor F. , Yan Chenyu 
Published: October 2009

AbstractIn this article, motivated by applications of ordinary (distance) spanners in communication networks and to address such issues as bandwidth constraints on network links, link failures, network survivability, etc., we introduce a new notion of flow spanner, where one seeks a spanning subgraph H = (V, E') of a graph G = (V, E) which provides a “good” approximation of the source‐sink flows in G. We formulate several variants of this problem and investigate their complexities. Special attention is given to the version where H is required to be a tree. © 2009 Wiley Periodicals, Inc. NETWORKS, 2010
Early onset preeclampsia and second trimester serum markers
Authors: Lambert‐Messerlian Geralyn M. , Palomaki Glenn E. , Neveux Louis M. , Chien Edward , Friedman Alex , Rosene‐Montella Karen , Hayes Meghan , Canick Jacob A. 
Published: October 2009

AbstractObjectiveTo examine serum markers measured in the second trimester to identify women who subsequently develop preeclampsia.MethodsClinically defined preeclampsia was confirmed in 45 women who had provided a serum sample as part of Down syndrome screening. Preeclampsia was categorized as mild or severe, as well as early (<32 weeks) or late onset. Each case was matched with five controls based on gestational age and date of serum collection. Stored sera were retrieved and tested for inhibin A, soluble vascular endothelial growth factor receptor 1 (sVEGF R1), placental growth factor (PlGF), and endoglin. Results were converted to multiples of the median (MoM) and compared in case and control pregnancies. Univariate analysis was used to identify the strongest markers, which were then used in a multivariate model.ResultsInhibin A, PlGF, and endoglin were consistently associated with preeclampsia, especially for early onset disease. A multivariate model using the three markers could identify 50% of the pregnancies with early onset preeclampsia with a 2% false positive rate.ConclusionThe levels of inhibin A, PlGF, and endoglin in the second trimester can be combined using a predictive model to provide individualized risk estimates for early onset preeclampsia. Copyright © 2009 John Wiley & Sons, Ltd.
Biocompatibility of braided poly(L‐lactic acid) nanofiber wires applied as tissue sutures
Authors: Hu Wen , Huang Zheng‐Ming 
Published: October 2009

AbstractAlmost all sutures in current usage only play one role, i.e. to mechanically tie wound tissues together. Drug‐loaded composite nanofibers obtained through coaxial electrospinning can initiate the development of a new type of biodegradable sutures with drug release. In this work, electrospun poly(L‐lactic acid) (PLLA) nanofibers with uniaxial alignment were made into braided wires and were coated with chitosan and applied as tissue sutures. Toxicity evaluation on cells for the chitosan‐coated PLLA braided wires was carried out using the MTT (3‐(4,5‐dimethylthiazol‐2‐yl)‐5‐(3‐carboxymethoxyphenyl)‐2‐(4‐sulfophenyl)‐2H‐tetrazolium) test, and an in vivo study was conducted by implanting the braided wires into muscle tissues of rats. The inflammation responses were examined at 3, 7, 14, 21 and 28 days after implanting. Experimental results indicated that the braided PLLA nanofiber wires coated with chitosan exhibited comparable tensile and knot strengths to those of a commercial suture, could tie wounded tissues for a complete healing without any breakage, had no cellular toxicity and could promote cell growth well. The chitosan‐coated PLLA sutures showed better histological compatibility than a silk suture in the in vivo study. Braided PLLA nanofiber wires fabricated using an electrospinning process followed by a braiding technique and coated with chitosan are applicable for uses within the body. Copyright © 2009 Society of Chemical Industry
Using a random dependent group contingency to increase on‐task behaviors of high school students with high incidence disabilities
Authors: Williamson Brenda D. , Campbell‐Whatley Gloria D. , Lo Ya‐yu 
Published: October 2009

AbstractGroup contingencies have the advantages of encouraging individual students to collectively feel responsible for appropriate and inappropriate classroom behaviors and have shown effectiveness in improving students' behavior. The purpose of this study was to investigate the effects of a random dependent group contingency on the on‐task behaviors of six high school students with high incidence disabilities in a resource classroom. The study used an ABAB reversal design, and the results of the study indicated that the random dependent group contingency intervention was positively associated with increases in on‐task behaviors for three of the six participants. Limitations and implications are discussed in relation to dependent group contingencies for high school students. © 2009 Wiley Periodicals, Inc.
Novel Gas‐Liquid Interfacial Plasmas for Synthesis of Metal Nanoparticles
Authors: Kaneko Toshiro , Baba Kazuhiko , Harada Takashi , Hatakeyama Rikizo 
Published: October 2009

AbstractSpatially and temporally stable gas‐liquid interfacial plasmas are created using ionic liquids as electrodes of a direct‐current (DC) discharge under a low gas pressure condition. The potential structure formation in the gas‐liquid interfacial region and the resultant behavior of the plasma ions are revealed by changing a polarity of the electrode in the liquid. When the ionic liquid is utilized as a cathode electrode, the positive ions in the plasma are irradiated to the ionic liquid and cause the physical and chemical reactions of the ionic liquid at the interface. The plasma ion irradiation can easily be controlled by changing the plasma parameter and is found to be effective for the metal nanoparticle synthesis in comparison with an electron irradiation.magnified image
Sampling plans, selective insecticides and sustainability: the case for IPM as ‘informed pest management’
Authors: Castle Steven , Naranjo Steven E 
Published: October 2009

AbstractIntegrated Pest Management (IPM) is considered the central paradigm of insect pest management and is often characterized as a comprehensive use of multiple control tactics to reduce pest status while minimizing economic and environmental costs. As the principal precursor of IPM, the integrated control concept formulated the economic theory behind pest management decisions and specified an applied methodology for carrying out pest control. Sampling, economic thresholds and selective insecticides were three of the critical elements of that methodology and are now considered indispensable to the goals of IPM. We examine each of these elements in the context of contemporaneous information as well as accumulated experience and knowledge required for their skillful implementation in an IPM program. We conclude that while IPM is principally about integrating control tactics into an effective and sustainable approach to pest control, this overarching goal can only be achieved through well‐trained practitioners, knowledgeable of the tenets conceived in the integrated control concept that ultimately yield informed pest management. Copyright © 2009 Society of Chemical Industry
Memristive devices based on solution‐processed ZnO nanocrystals
Authors: Wang Jianpu , Sun Baoquan , Gao Feng , Greenham Neil C. 
Published: October 2009

AbstractWe present a memristive device fabricated using low‐cost solution‐processed colloidal ZnO nanocrystals. Taking advantage of the large surface area of ZnO nanocrystals, we find that an oxygen depletion region can be naturally formed by chemical interaction between an Al electrode and the ZnO nanocrystals. Strong electrical hysteresis, history‐dependent conductance, and sweep‐rate‐dependent current–voltage (J–V) curves are observed in our devices. The resistance can be modified between ∼1 and ∼104 Ω cm2, which is promising for application in non‐volatile memory devices and in low‐cost organic circuits, where typical feature sizes are about 10–100 µm and the circuit current is low.
A new strategy for Phase I analysis in SPC
Authors: Shiau Jyh‐Jen Horng , Sun Jian‐Huang 
Published: October 2009

AbstractThe Phase I analysis in statistical process control usually includes a task of filtering out out‐of‐control data in the historical data set via control charting. The conventional procedure for this is an iterative procedure that first uses all the samples to set up initial trial control limits and discards all the ‘out‐of‐control’ samples accordingly, and then iteratively repeats the screening step on the remaining samples until no more ‘out‐of‐control’ samples are detected. For simplicity, the ‘out‐of‐control’ samples here refer to the samples with their monitoring statistics exceeding the trial control limits. It is found in this study that this procedure throws away too many useful in‐control samples. To overcome this drawback, we propose and study a new iterative procedure that discards only one ‘out‐of‐control’ sample (i.e. the most extreme one) at each iteration. Our simulation study, using the Shewhart X Chart for illustration, demonstrates that the new one‐at‐a‐time procedure reduces dramatically the occurrences of false alarms. For cost‐saving, we further suggest a new strategy on when to stop and inspect the process to look for assignable causes for samples signaling out‐of‐control alarms. To determine the control limits, both the traditional method that controls the individual false‐alarm‐rate and the Bonferroni method that controls the overall false‐alarm‐rate are considered. The performances of the proposed schemes are evaluated and compared in terms of the false‐alarm rate and the detecting power via simulation studies. Copyright © 2009 John Wiley & Sons, Ltd.
Second‐Harmonic Generation from a Single Core/Shell Quantum Dot
Authors: Zielinski Marcin , Oron Dan , Chauvat Dominique , Zyss Joseph 
Published: October 2009

AbstractNanoparticles emitting two‐photon luminescence are broadly used as photostable emitters for nonlinear microscopy. Second‐harmonic generation (SHG) as another two‐photon mechanism offers complementary optical properties but the reported sizes of nanoparticles are still large, of a few tens of nanometers. Herein, coherent SHG from single core/shell CdTe/CdS nanocrystals with a diameter of 10 to 15 nm is reported. The nanocrystal excitation spectrum reveals resonances in the nonlinear efficiency with an overall maximum at about 970 nm. Polarization analysis of the second‐harmonic emission confirms the expected zinc blende symmetry, and allows extraction of the three‐dimensional nanocrystal orientation. The small size of these nonlinearly active quantum dots, together with the intrinsic coherence and orientation sensitivity of the SHG process, are well adapted for ultrafast probing of optical near‐fields with high resolution as well as for orientation tracking for bioimaging applications.
Examining the returns of American depository receipts: Evidence from emerging and developed markets
Authors: Kiymaz Halil , Alon Ilan , Theodore Veit E. 
Published: October 2009

AbstractThe purpose of this article is to explain the returns of American Depository Receipts (ADRs), comparing the results across emerging and developed markets. Using a sample of 167 ADRs from 14 emerging and 17 developed markets (31 markets in total) for the period 2000–2004, we found variations in the impacts of specific variables and in the explanatory power of models associated with the annual holding‐period return of firms. Dividing ADRs into emerging and developed markets suggests that firm size and local market conditions influenced returns in the two groups in similar ways. However, firm‐specific business risk and country‐specific economic risk are only important to emerging markets' ADRs, while country‐specific exchange‐rate variables are more important to developed markets' ADRs. © 2009 Wiley Periodicals, Inc.
Introduction: Navigating the global private equity frontier: Tumultuous and opportunistic times
Authors: Boedy Susan 
Published: October 2009

AbstractAt the Fifth Annual Global Private Equity Investing Conference on Thunderbird's campus in Glendale, Arizona, held in late March 2009, it was made clear the economic crisis not only has shown the world that economic globalization has come, but it also brings with it many new and surprising opportunities. For private equity in particular, globalization is imperative.This issue of the Thunderbird International Business Review offers an in‐depth look into several key topics for private equity in these tumultuous times, including how to structure a successful private equity portfolio, tools for reaching liquidity, and opportunities in the secondary and distressed debt markets. Katharina Lichtner of Capital Dynamics, Hans Swildens of Industry Ventures, Roger Wittlin of Silver Lake, and Sebastien Burdel of Coller Capital explore these timely topics in the following pages. © 2009 Wiley Periodicals, Inc.
How to build a successful private equity portfolio
Authors: Lichtner Katharina 
Published: October 2009

AbstractThe route to a successful private equity portfolio is a four‐step process that requires an in‐depth understanding of private equity as an asset class as well as the skills to select promising opportunities from available offerings. The first step is to set out and define general allocation guidelines. These initial guidelines then have to be refined based on the availability of adequate investment opportunities. The third step involves selecting the most attractive funds from a pool of target funds. And lastly the portfolio must be monitored on an ongoing basis to track its overall development as well as its enduring performance. Benchmarking the overall performance of the portfolio as well as individual managers is an integral part of this. In the following sections, each individual step is discussed and explained in more detail. © 2009 Wiley Periodicals, Inc.
Private equity secondaries: Opening the liquidity tap
Authors: Burdel Sebastien 
Published: October 2009

AbstractPrivate equity is an illiquid asset class. The extended holding period for private equity—averaging four to five years—attracts investors, as fund managers are able to avoid the volatility that negatively affects the public equities. However, the secondary market has emerged as a tool that enables limited partners in private equity funds to manage a private equity portfolio flexibly despite its intrinsic illiquidity. This article discusses in great detail the scope of secondary transactions, discussing how the subsegment has evolved over time from the straightforward purchase of limited partnership interest to the more elaborate transactions involving structural creativity and complex problem solving for sellers. It is concluded that the growth in secondaries brings liquidity to the asset class and thus makes private equity a more compelling investment proposition. As such, the secondary market will continue to be a key driver for growth of the private equity industry. © 2009 Wiley Periodicals, Inc.
Continuous extrusion production of microcellular rigid PVC
Authors: Diaz Carlos A. , Matuana Laurent M. 
Published: October 2009

AbstractThis study examined the effect of Poly[vinyl chloride] (PVC) formulation on the cell morphology and density of rigid PVC foamed with supercritical CO2 in a continuous extrusion process. Cell morphology and the density of foamed samples were controlled by blending two acrylic‐based processing aids (all‐acrylic foam modifier K‐400 and acrylic‐based impact modifier KM‐334), using a mixture design. The effect of blend ratios on the fusion and die swell behaviors of PVC was investigated by means of a torque rheometer and on a single‐screw extrusion capillary rheometer, respectively. Fusion was promoted as the relative amount of the all‐acrylic foam modifier increased in the blends. Similarly, the elastic constant of PVC, derived from the linear relationship between the die swell and apparent shear stress, increased upon increasing the relative amount of the all‐acrylic foam modifier in the blends, thus suggesting an increase in the melt elasticity of PVC. Microcellular rigid PVC foams with densities of approximately 0.15 g/cm3 and a tenfold volume expansion were produced. An optimum ratio of impact modifier to all‐acrylic foam modifier of 1:3 was found to maximize the foam expansion. Using impact modifier alone or all‐acrylic foam modifier alone yielded expansions considerably lower than that achieved with the 1:3 blend. The experimental results indicated that fusion is not the only criterion to control the cell morphology and density achieved in microcellular rigid PVC foams. The melt must have a viscosity low enough to allow bubble formation and growth, as well as elasticity high enough to prevent cell coalescence. J. VINYL ADDIT. TECHNOL., 2009. © 2009 Society of Plastics Engineers
Influence of ultrafine zinc borate on the thermal degradation behavior of a(low‐density polyethylene)/(intumescent flame retardant) system
Authors: Wu Zhiping , Hu Yunchu , Shu Wangen 
Published: October 2009

AbstractThe thermal degradation behavior of low‐density polyethylene (LDPE), LDPE treated with an intumescent flame retardant (LDPE/IFR), and LDPE treated with an intumescent flame retardant and ultrafine zinc borate (LDPE/IFR/UZB) was studied by (thermal gravimetric)‐(differential thermal) analysis (TG‐DTA) and cone calorimetry. The results of TG‐DTA showed that the initial degradation temperature increased, thermal degradation rate decreased, and the residual char amount increased substantially during the Pyrolysis process when ultrafine zinc borate was introduced into the LDPE/IFR system. The mass‐loss rate (MLR) curves and mass curves obtained by cone calorimetry showed that UZB could decrease the MLR and significantly enhance the residual char amount of LDPE/IFR during the combustion process. The results of Fourier transform infrared spectroscopy implied that a graphite‐like char and aromatic structures containing P‐O‐P, P‐O‐C, and B‐O‐B bonds were formed when LDPE/IFR/UZB was heated at high temperature. Scanning electronic micrographs of residual chars showed that ultrafine zinc borate improved char quality. X‐ray diffraction Studies implied that boron orthophosphate (BPO4) formed in the residual char may play an important role in improving the structural properties of the char and is responsible for its good quality. J. VINYL ADDIT. TECHNOL., 2009. © 2009 Society of Plastics Engineers