bluuebunny/crossref_metadata_2025_split huggingface dataset:
Pancreatic diffusion‐weighted imaging (DWI): Comparison between mass‐forming focal pancreatitis (FP), pancreatic cancer (PC), and normal pancreas
Authors: Fattahi Rana , Balci N. Cem , Perman William H. , Hsueh Eddy C. , Alkaade Samer , Havlioglu Necat , Burton Frank R. 
Published: January 2009

AbstractPurposeTo compare diffusion‐weighted imaging (DWI) findings and the apparent diffusion coefficient (ADC) values of pancreatic cancer (PC), mass‐forming focal pancreatitis (FP), and the normal pancreas.Materials and MethodsDWI (b = 0 and 600 seconds/mm2) findings of 14 patients with mass‐forming FP proven by histopathology and or clinical follow‐up, 10 patients with histopathologically‐proven PC, and 14 subjects with normal pancreatic exocrine function and normal imaging findings were retrospectively evaluated. ADC values of the masses, the remaining pancreas, and the normal pancreas were measured.ResultsOn b = 600 seconds/mm2 DWI, mass‐forming FP was visually indistinguishable from the remaining pancreas whereas PC was hyperintense relative to the remaining pancreas. The mean ADC value of PC (1.46 ± 0.18 mm2/second) was significantly lower than the remaining pancreas (2.11 ± 0.32 × 10–3 mm2/second; P < 0.0001), mass‐forming FP (2.09 ± 0.18 × 10–3 mm2/second; P < 0.0001), and pancreatic gland in the control group (1.78 ± 0.07 × 10–3 mm2/second; P < 0.0005). There was no significant difference of ADC values between the mass‐forming focal pancreatitis and the remaining pancreas (2.03 ± 0.2 × 10–3 mm2/second; P > 0.05).ConclusionDifferences on DWI may help to differentiate PC, mass‐forming FP, and normal pancreas from each other. J. Magn. Reson. Imaging 2009;29:350–356. © 2009 Wiley‐Liss, Inc.
On the inter‐instrument and inter‐laboratory transferability of a tandem mass spectral reference library: 1. Results of an Austrian multicenter study
Authors: Oberacher Herbert , Pavlic Marion , Libiseller Kathrin , Schubert Birthe , Sulyok Michael , Schuhmacher Rainer , Csaszar Edina , Köfeler Harald C. 
Published: January 2009

AbstractThe inter‐instrument and inter‐laboratory transferability of a tandem mass spectral reference library originally built on a quadrupole‐quadrupole‐time‐of‐flight instrument was examined. The library consisted of 3759 MS/MS spectra collected from 402 reference compounds applying several different collision‐energy values for fragmentation. In the course of the multicenter study, 22 test compounds were sent to three different laboratories, where 418 tandem mass spectra were acquired using four different instruments from two manufacturers. The study covered the following types of tandem mass spectrometers: quadrupole‐quadrupole‐time‐of‐flight, quadrupole‐quadrupole‐linear ion trap, quadrupole‐quadrupole‐quadrupole, and linear ion trap‐Fourier transform ion cyclotron resonance mass spectrometer. In each participating laboratory, optimized instrumental parameters were gathered solely from routinely applied workflows. No standardization procedure was applied to increase the inter‐instrument comparability of MS/MS spectra. The acquired tandem mass spectra were matched against the established reference library using a sophisticated matching algorithm, which is presented in detail in a companion paper. Correct answers, meaning that the correct compound was retrieved as top hit, were obtained in 98.1% of cases. For the remaining 1.9% of spectra, the correct compound was matched at second rank. The observed high percentage of correct assignments clearly suggests that the developed mass spectral library search approach is to a large extent platform independent. Copyright © 2009 John Wiley & Sons, Ltd.
Study by ESI‐FTICRMS and ESI‐FTICRMSn of zinc and cadmium thiophenolate complexes used as precursors for the synthesis of II–VI nanosemiconductors
Authors: Arl Didier , Aubriet Frédéric , Gaumet Jean‐Jacques 
Published: January 2009

Abstract[M4(SC6H5)10][(CH3)N]2, [M10L4(SC6H5)16][(CH3)N]4 and [Cd17S4(SC6H5)28][(CH3)N]2(M = Cd or Zn, and L = S or Se) zinc and cadmium thiophenolates have been studied by electrospray ionization (ESI) Fourier transform ion cyclotron resonance (FTICR) mass spectrometry (ESI‐FTICRMS) and tandem ESI‐FTICRMS (ESI‐FTICRMSn). ESI‐FTICRMS demonstrated its ability to characterize and study such compounds, which may be used as precursors of II–VI nanomaterials. The obtained mass spectrum has been found to be highly relevant of the investigated thiophenolate and the fragmentation behavior of some of the detected ions is indicative of its stability. More specifically, it has been demonstrated that ESI in‐source activation or fragmentation experiments conducted in the Fourier transform ion cyclotron resonance mass spectrometry (FTICRMS) cell induced the formation of a very stable entity, which corresponds to the general formula M4L4 (M = Zn or Cd and L = S or Se). The elimination of SC6H5− and/or M(SC6H5)2 moieties by various activation processes from the studied thiophenolates led systematically to this structure. Copyright © 2009 John Wiley & Sons, Ltd.
Modelling daily precipitation features in the Volta Basin of West Africa
Authors: Laux P. , Wagner S. , Wagner A. , Jacobeit J. , Bárdossy A. , Kunstmann H. 
Published: January 2009

AbstractThe combination of a conventional Markov chain model (zero and first order) and a gamma distribution model are found to be applicable to derive meaningful agricultural features from precipitation in the Volta Basin (West Africa). Since the analysis of the monthly or annual precipitation amount does not provide any adequate information on rainfall timing and sufficiency of crop water requirement, rainfall modelling was performed on a daily time scale for 29 rainfall stations. The modelled rainfall features follow distinct spatial patterns, which will be presented as maps of(1) rainfall occurrence probabilities and (2) recommendations of optimal planting dates. In addition, the effective drought index (EDI) working on daily time scales is calculated in order to assess drought properties of five different rainfall regions within the Volta Basin. Apart from the common way of separately modelling the duration and intensity due to their different distributions, a copula approach is chosen in this study to construct a bivariate drought distribution. Application of the measures derived to agricultural decision support will be discussed briefly. Copyright © 2009 Royal Meteorological Society
Environmental conditions in relation to stress in cherry tomato fruits in two experimental Mediterranean greenhouses
Authors: Rosales Miguel A , Ríos Juan J , Cervilla Luis M , Rubio‐Wilhelmi María M , Blasco Begoña , Ruiz Juan M , Romero Luis 
Published: January 2009

AbstractBACKGROUND: Considering the economic importance of tomato and its nutritional benefits to human health, a study was conducted on how different environmental factors (temperature, solar radiation and vapour pressure deficit (VPD)) influence hydrogen peroxide detoxification and several stress indicators in cherry tomato (Solanum lycopersicum cv. Naomi) fruits grown in two experimental Mediterranean greenhouses of parral (low‐technology) type and multispan (high‐technology) type.RESULTS: Three fruit samplings were made at the beginning, middle and end of the fruit production period. Values of temperature, solar radiation and VPD peaked at the third sampling in both greenhouses, being higher in the parral‐type greenhouse, while there was a reduction in market production at the third sampling. Peroxidation (malondialdehyde content and lipoxygenase activity) increased significantly at the third sampling, indicating the presence of oxidative stress caused by the rise in temperature, solar radiation and VPD. The ascorbate content, the activities of superoxide dismutase, catalase and ascorbate peroxidase and other stress indicators (proline and sucrose degradation) also increased at the third sampling.CONCLUSION: This study showed that conditions of higher environmental stress occurred at the third sampling and in the parral‐type greenhouse, leading to the accumulation of ascorbic acid in cherry tomato fruits and therefore to higher nutritional quality. Copyright © 2009 Society of Chemical Industry
Capillary affinity electrophoresis and ab initio calculation studies of valinomycin complexation with Na+ ion
Authors: Ehala Sille , Dybal Jirí , Makrlík Emanuel , Kašička Václav 
Published: January 2009

AbstractIn a combined experimental and theoretical approach, the interactions of valinomycin (Val), macrocyclic depsipeptide antibiotic ionophore, with sodium cation Na+ have been investigated. The strength of the Val–Na+ complex was evaluated experimentally by means of capillary affinity electrophoresis. From the dependence of valinomycin effective electrophoretic mobility on the sodium ion concentration in the BGE (methanolic solution of 20 mM chloroacetic acid, 10 mM Tris, 0–40 mM NaCl), the apparent binding (stability) constant (Kb) of the Val–Na+ complex in methanol was evaluated as log Kb = 1.71 ± 0.16. Besides, using quantum mechanical density functional theory (DFT) calculations, the most probable structures of the nonhydrated Val–Na+ as well as hydrated Val–Na+·H2O complex species were proposed. Compared to Val–Na+, the optimized structure of Val–Na+·H2O complex appears to be more realistic as follows from the substantially higher binding energy (118.4 kcal/mol) of the hydrated complex than that of the nonhydrated complex (102.8 kcal/mol). In the hydrated complex, the central Na+ cation is bound by strong bonds to one oxygen atom of the respective water molecule and to four oxygens of the corresponding C=O groups of the parent valinomycin ligand.
Application of continual injection liquid‐phase microextraction method coupled with liquid chromatography to the analysis of organophosphorus pesticides
Authors: Raharjo Yanuardi , Sanagi Mohd Marsin , Ibrahim Wan Aini Wan , Naim Ahmedy Abu , Aboul‐Enein Hassan Y. 
Published: January 2009

AbstractA liquid‐phase microextraction coupled with LC method has been developed for the determination of organophosphorus pesticides (methidation, quinalphos and profenofos) in drinking water samples. In this method, a small amount (3 μL) of isooctane as the acceptor phase was introduced continually to fill‐up the channel of a 1.5 cm polypropylene hollow fiber using a microsyringe while the hollow fiber was immersed in an aqueous donor solution. A portion of the acceptor phase (ca. 0.4 μL) was first introduced into the hollow fiber and additional amounts (ca. 0.2 μL) of the acceptor phase were introduced to replenish at intervals of 3 min until set end of extraction (40 min). After extraction, the acceptor phase was withdrawn and transferred into a 2 mL vial for a drying step prior to injection into a LC system. Parameters that affect the extraction efficiency were studied including the organic solvent, length of fiber, volume of acceptor and donor phase, stirring rate, extraction time, and effect of salting out. The proposed method provided good enrichment factors of up to 189.50, with RSD ranging from 0.10 to 0.29%, analyte recoveries of over 79.80% and good linearity ranging from 10.0 to 1.25 mg/L. The LOD ranged from 2.86 to 82.66 μg/L. This method was applied successfully to the determination of organophosphorus pesticides in selected drinking water samples.
Influence of a Self‐Assembling Peptide, RADA16, Compared with Collagen I and Matrigel on the Malignant Phenotype of Human Breast‐Cancer Cells in 3D Cultures and in vivo
Authors: Mi Kun , Wang Guixia , Liu Zijia , Feng Zhihua , Huang Ben , Zhao Xiaojun 
Published: January 2009

AbstractCancer‐cell phenotype is not only the result of malignant progression, but also dependent on the microenvironment surrounding them, including influences from the extracellular matrix and its structural properties. We have investigated the influence of the nanofiber matrix of the self‐assembling peptide, RADA16, in comparison with collagen I and Matrigel on the malignant phenotype of the human breast‐cancer cell, MDA‐MB‐231, in 3D cultures, including the morphology, survival, proliferation rate, migration potential and the effect of these matrices on the malignancy of the cancer cells in vivo. Our data indicate that these tumor cells change their morphology in response to the different 3D matrix in vitro cultures and the RADA16 self‐assembling peptide scaffold mimics an extracellular matrix and could effectively reduce the malignant phenotype of the tumor cells in vitro and in vivo.magnified image
Dependence of Protein Recognition of Temperature‐Sensitive Imprinted Hydrogels on Preparation Temperature
Authors: Turan Eylem , Özçetin Gökçen , Caykara Tuncer 
Published: January 2009

AbstractTemperature‐sensitive imprinted and non‐imprinted hydrogels composed of N‐isopropylacrylamide (NIPA) and 2‐acrylamido‐2‐methyl‐propanosulfonic acid (AMPS) have been prepared by free‐radical crosslinking copolymerization in aqueous solution at three different temperatures: 10 °C (below the lower critical solution temperature, LCST), 33 °C (at the LCST), and 40 °C (above the LCST). Myoglobin (Mb, MW 17 kDa) is used as the template biomolecule. The effects of the initial concentration and adsorption time over the Mb adsorption capacity of the hydrogels have been analyzed and found to be strongly dependent on the preparation temperature (Tprep). The maximum Mb adsorption for the imprinted hydrogel prepared at 10 °C is 97.40 ± 2.35 mg Mb · g−1 dry gel in 0.32 mg · mL−1 Mb solution at 22 °C. Moreover, batch adsorption equilibrium and selectivity studies have been performed using a reference molecule, hemoglobin (Hb, MW 65 kDa). The imprinted hydrogels have a 2.8–3.3 times higher adsorption capacity for Mb than the non‐imprinted hydrogels prepared at the same Tpreps, and also have a 1.8–2.7 times higher selectivity for the imprinted molecule.magnified image
Frequency‐independent performance of elliptic profile TEM horns
Authors: Malherbe Jag 
Published: January 2009

AbstractThe TEM horn with elliptic E‐plane profile has been shown to give extremely wide bandwidth performance as far as VSWR and gain is concerned. In this article, the variation in radiation pattern versus frequency is explored, and it is shown that, dependant on choice, E‐plane or H‐plane radiation patterns that are virtually independent of frequency can be obtained. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 607–612, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24109
A novel wideband butler matrix using multi‐layer technology
Authors: Traii Mbarek , Nedil Mourad , Gharsallah Ali , Denidni Tayeb A. 
Published: January 2009

AbstractThis article presents a novel design of a 4 × 4 two‐layer wideband Butler matrix using slot coupled directional couplers and wideband crossover. With this new configuration, the proposed matrix was designed to minimize the number of crossovers for reducing the size, the loss of the network and the complexity of the design, which leads with a broad bandwidth of ∼1.5 GHz. A four‐antenna array was connected to the matrix to build a beam‐forming system for beam steering. As a result, four orthogonal beams are produced at −45°, −15°, 15°, and 45°. This matrix is suitable for wideband communication systems. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 659–663, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24116
Improving in‐body ultra wideband communication using near‐field coupling of the implanted antenna
Authors: Khaleghi Ali , Balasingham Ilangko 
Published: January 2009

AbstractUltra wideband (UWB) signal transmission from in‐body implanted antenna to on‐body or outside body is considered for biomedical applications. The received energy density of the UWB signal in terms of the distance from the body surface of a human anatomy model is computed. Time‐domain finite integral equation (FIE) and frequency‐dependent body tissue properties are used for field calculations. Path loss factors of the UWB channel for different distances from the body surface and different implanted antenna depths are derived. It is shown that the energy coupling because of the nonradiative near‐field of the body implanted antenna is dominant for the signal transmission. The communication link quality can be significantly improved in the range of 14.5–18 dB by exploiting the near‐field components. As a result, we propose to use the nonradiative near‐field region of the implanted antenna for improving the communication link quality by designing and placing the receiving antenna close to the body surface and then by relaying the signal to the off‐body communication device. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 585–589, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24126
Design and implementation of UWB CPW‐fed planar monopole antenna
Authors: Maeng Joong Ho , Lee Yong Joo , Yang Woon Geun 
Published: January 2009

AbstractIn this article, we designed a CPW‐fed planar monopole antenna suitable for ultra wideband (UWB) wireless communication. The proposed antenna has a rectangular patch with four rectangular notches and bottom elements with a CPW‐fed line embedded inside the bottom elements. A HFSS (High Frequency Structure Simulator) is used to analyze the proposed antenna in the design process and to compare it with the experimental results. The bandwidth of the proposed antenna is measured as 3.083–11.000 GHz for voltage standing wave ratio <2. Measured maximum gain is ∼5.7 dBi at 10.00 GHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 650–653, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24127
Optical generation of microwave signal for FMCW radar applications
Authors: Faci S. , Tripon‐Canseliet C. , Benlarbi‐Delaï A. , Alquié G. , Formont S. , Chazelas J. 
Published: January 2009

AbstractAn optically shifted oscillator has been designed in integrated technology and tested in order to use as a signal generator for frequency modulated continuous wave radar applications. Simulation and measurement results demonstrate a 200 MHz microwave frequency tuning range when the applied optical power varies from 0 to 100 mW at a wavelength of 800 nm. Illumination is applied on a photoconductive switch inserted within the circuit to achieve a quasi‐linear oscillation frequency shift with a linear variation of optical power. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 690–693, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24146
A 2 mW, 55.8‐GHz CMOS injection‐locked frequency divider with 7.1‐GHz locking range
Authors: Hsu Wei‐Lun , Chen Chang‐Zhi , Lin Yo‐Sheng 
Published: January 2009

AbstractA low‐power and wide‐locking‐range 55.8‐GHz (V‐band) injection‐locked frequency‐divider (ILFD) using standard 0.13 μm CMOS technology is reported. To enhance locking range, a shunt inductor was introduced in the source node of the cross‐coupled pair to maximize the equivalent load impedance of the tail transistor, i.e. to maximize the internal power, over the frequency band of interest. In addition, the inductors and capacitors of the LC‐tank were implemented by low‐Q micro‐stripline inductors and high‐Q varactors, respectively, to further improve the locking range of the ILFD. The result shows that a wide‐locking‐range of 7.1 GHz (from 48.7 GHz to 55.8 GHz, 13.6%) was achieved. The power consumption of the ILFD is only 2 mW from a 1.1 V power supply. The chip area was only 0.66 × 0.48 mm2excluding the test pads. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 702–706, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24148
A 40‐W balanced GaN HEMT class‐E power amplifier with 71% efficiency for WCDMA base station
Authors: Lee Yong‐Sub , Lee Mun‐Woo , Jeong Yoon‐Ha 
Published: January 2009

AbstractA balanced class‐E power amplifier (PA) using a push‐pull GaN HEMT for high power and high efficiency is represented. For validation, a class‐E PA is designed and implemented using a push‐pull type GaN HEMT and tested for a single tone of 2.14 GHz. The measured results show that the balanced GaN HEMT class‐E PA shows a drain efficiency and power‐added efficiency (PAE) of 71% and 67.4% at an output power of 40 W with a gain of 13 dB through the significant harmonic suppression of below −51 dBc. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 842–845, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24150
Miniaturized defected ground structure using lumped capacitor
Authors: Sung Y. J. 
Published: January 2009

AbstractIn this letter, the miniaturized bandstop filter with lumped capacitor element is presented. The resonator is based on a stopband characteristic of U‐shaped defected ground structure (DGS) section. Lumped capacitor element is embedded into DGS section without altering the geometry. The resonant frequency of DGS section is significantly lowered in accordance with increase of capacitor value. The DGS section with different capacitance values is designed and fabricated. From the measured results, size reduction over 60% is achieved by this method. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 802–804, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24152
Small CPW‐fed triple band microstrip monopole antenna for WLAN applications
Authors: Song Xiaodi 
Published: January 2009

AbstractIn this article, a small triple band monopole antenna fed by a coplanar waveguide (CPW) is presented. The proposed antenna has been developed for IEEE802.11 wireless local area network applications in three service bands of 2.4–2.48, 5.15–5.35, and 5.725–5.825 GHz. The small monopole has compact dimensions of 14‐mm height and 26‐mm width. Fed by CPW, it can be integrated with other communication devices easily. The designed antenna is simulated by HFSS software and a good agreement with experimental results is demonstrated. The three operated bandwidths are about 20%, 8%, and 7%. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 747–749, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24166
Experimental study of the influence of moisture and dry density on a silt soil using a monopole probe
Authors: Sagnard F. , Beck Y.‐L. 
Published: January 2009

AbstractABSTRACT: Dielectric measurements have been made on a silt soilboard with three moisture contents and different densities using a short monopole probe at microwave frequencies. A detailed analysis has been made to obtain the variation law of the real permittivity with the volumetric moisture content and the dry density of the soil studied. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 820–826, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24185
General equations for the design and evaluation of a stack of two bulk acoustic wave resonators
Authors: Menéndez Óscar , de Paco Pedro , Gemio Joan 
Published: January 2009

AbstractThis article presents a number of general equations for the primary design and evaluation of a stack of two bulk acoustic wave resonators, a structure traditionally known as a stacked crystal filter. The reported equations are validated against the work of other authors, finding a very good agreement between the results. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 752–755, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24188