bluuebunny/crossref_metadata_2025_split huggingface dataset:
Locomotion of fish epidermal keratocytes on spatially selective adhesion patterns
Authors: Csucs Gabor , Quirin Katharina , Danuser Gaudenz 
Published: August 2007

AbstractCell migration results from forces generated by assembly, contraction, and adhesion of the cytoskeleton. To address how these forces integrate in space and time, novel assays are required that allow spatial separation of the different force categories. We used micro‐contact printing of fibronectin on glass substrates to study the effect of adhesion patterns on fish epidermal keratocytes locomotion. Cells migrated at similar speeds on homogeneously adhesive substrates and on patterns with 5 μm‐wide adhesive stripes interleaved by non‐adhesive stripes with a width varied between 5 and 13 μm. The leading edge protruded on adhesive stripes and lagged behind on non‐adhesive stripes. On patterns with non‐adhesive stripes wider than 13 μm cells halted, although the lamellipodium did not collapse. High correlation was found between the widths of protruding and lagging edge segments and the widths of the underlying stripes. We explain our data by the force balances between actin polymerization, contraction and adhesion on fibronectin stripes; and between actin polymerization, contraction and lamellipodium‐internal elastic tension on non‐adhesive stripes. We tested our model further by blocking lamellipodium actin network contraction and polymerization. In both experiments we observed that cells eventually lost their ability to move. However, the two perturbations induced distinct morphological responses. The data suggested that forces powering forward motion of keratocytes are largely associated with network assembly whereas contraction maintains cell polarity. This study establishes spatially selective adhesion substrates and cell morphological readouts as a means to elucidate the mechanical balance between substrate adhesion and cytoskeleton‐internal tension in cell migration. Cell Motil. Cytoskeleton, 2007. © 2007 Wiley‐Liss, Inc.
Proactive gossip‐based management of semantic overlay networks
Authors: Voulgaris Spyros , van Steen Maarten , Iwanicki Konrad 
Published: August 2007

AbstractMuch research on content‐based P2P searching for file‐sharing applications has focused on exploiting semantic relations between peers to facilitate searching. Current methods suggest reactive ways to manage semantic relations: they rely on the usage of the underlying search mechanism, and infer semantic relationships based on the queries placed and the corresponding replies received. In this paper we follow a different approach, proposing a proactive method to build a semantic overlay. Our method is based on an epidemic protocol that clusters peers with similar content. Peer clustering is done in a completely implicit way, that is, without requiring the user to specify preferences or to characterize the content of files being shared. In our approach, each node maintains a small list of semantically optimal peers. Our simulation studies show that such a list is highly effective when searching files. The construction of this list through gossiping is efficient and robust, even in the presence of changes in the network. Copyright © 2007 John Wiley & Sons, Ltd.
Tracking provenance in a virtual data grid
Authors: Clifford Ben , Foster Ian , Voeckler Jens‐S. , Wilde Michael , Zhao Yong 
Published: August 2007

AbstractThe virtual data model allows data sets to be described prior to, and separately from, their physical materialization. We have implemented this model in a Virtual Data Language (VDL) and associated supporting tools, which provide for both the storage, query, and retrieval of virtual data set descriptions, and the automated, on‐demand materialization of virtual data sets. We use a standardized data provenance challenge exercise to illustrate the powerful queries that can be performed on the data maintained by these tools, which for a single virtual data set can include three elements: the computational procedure(s) that must be executed to materialize the data set, the runtime log(s) produced by the execution of the computation(s), and optional metadata annotation(s) that associate application semantics with data and procedures. Copyright © 2007 John Wiley & Sons, Ltd.
Protein Side Chains Facilitate Mg/Al Exchange in Model Protein Binding Sites
Authors: Rezabal Elixabete , Mercero Jose M. , Lopez Xabier , Ugalde Jesus M. 
Published: August 2007

AbstractAmong the most frequent protein binding sites served by MgII, we identify those which have higher affinity towards AlIII. We also estimate the free energies of metal exchange for all these binding sites taking into account solvent effects explicitly. The obtained results show that thermodynamically favored MgII/AlIII exchange reactions take place at a number of these metal binding sites, which could possibly be related to some dysfunctions of MgII‐dependent biological processes. Additionally, they shed light on the molecular basis of the toxicity of AlIII in living organisms.
Evaluation of a green laser pointer for flow cytometry
Authors: Habbersett Robert C. , Naivar Mark A. , Woods Travis A. , Goddard Gregory R. , Graves Steven W. 
Published: August 2007

AbstractFlow cytometers typically incorporate expensive lasers with high‐quality (TEM00) output beam structure and very stable output power, significantly increasing system cost and power requirements. Red diode lasers minimize power consumption and cost, but limit fluorophore selection. Low‐cost DPSS laser pointer modules could possibly offer increased wavelength selection but presumed emission instability has limited their use. A $160 DPSS 532 nm laser pointer module was first evaluated for noise characteristics and then used as the excitation light source in a custom‐built flow cytometer for the analysis of fluorescent calibration and alignment microspheres. Eight of ten modules tested were very quiet (RMS noise ≤ 0.6% between 0 and 5 MHz). With a quiet laser pointer module as the light source in a slow‐flow system, fluorescence measurements from alignment microspheres produced CVs of about 3.3%. Furthermore, the use of extended transit times and ≤1 mW of laser power produced both baseline resolution of all 8 peaks in a set of Rainbow microspheres, and a detection limit of <20 phycoerythrin molecules per particle. Data collected with the transit time reduced to 25 μs (in the same instrument but at 2.4 mW laser output) demonstrated a detection limit of ∼75 phycoerythrin molecules and CVs of about 2.7%. The performance, cost, size, and power consumption of the tested laser pointer module suggests that it may be suitable for use in conventional flow cytometry, particularly if it were coupled with cytometers that support extended transit times. Published 2007 Wiley‐Liss, Inc.
A new type of SRAM using DRAM technology
Authors: Kihara Yuji , Okamura Leona , Nakashima Yasushi , Izutsu Takashi , Nakamoto Masayuki , Yoshihara Tsutomu 
Published: August 2007

Abstract16‐Mbit low‐power SRAM (SuperSRAM) was developed using a new memory cell technology which makes use of DRAM technology and TFT technology, which has a record of actual performance in SRAM. For SRAM, the problems of soft errors and operation at the lower limits of Vcchave manifested at the increasing levels of miniaturization, and increases in capacity have become increasingly difficult. Nonetheless, complete compatibility with asynchronous SRAM has been implemented with the free use of circuit technology, while various problems have been resolved without cost increases using DRAM memory cell technology, which reduces surface area. The characteristics of such devices are discussed predominantly from the perspective of design. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 90(9): 32–41, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20330
Coupling coefficient of resonators—An intuitive way of its understanding
Authors: Awai Ikuo , Zhang Yangjun 
Published: August 2007

AbstractA new representation of the coupling coefficient of resonators has been obtained by the authors using the coupled mode theory. In this expression, the coupling coefficient is given by an overlap integral of the electric field and the magnetic field. This expression is extremely useful for explanation of the physical meaning of coupling. In the present paper, various microstrip resonators are discussed and their coupling mechanisms are explained by the above theory resulting in a clear interpretation that includes phenomena hitherto not adequately explained. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 90(9): 11– 18, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20342
Equivalent circuit analysis for vias in multilayered printed circuit boards by optimization method
Authors: Shiraki Yasuhiro , Sugahara Kengo , Murata Yuichiro , Nishi Shinya 
Published: August 2007

AbstractIn this paper, a highly accurate equivalent circuit is constructed that can calculate the transmission characteristics of the vias connecting the layers in multilayered printed circuit boards. Various factors of the vias affecting the transmission characteristics are discussed. The present equivalent circuit is based on the physical structure and the equivalent circuit parameters are determined by an optimization method. The equivalent circuit is applied to the vias in printed circuit boards with more than 10 layers. The results of evaluation of the transmission characteristics in the gigahertz range are verified by the FDTD method and by measurement so as to verify their validity. Further, by using the present equivalent circuit, the effects of various factors of the vias on the transmission characteristics are studied. It is demonstrated that the time needed for study by the equivalent circuit is less than that needed for numerical analysis. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 90(9): 1–10, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20350
Realization of feature description systems for clusters by rule generation based on genetic programming and its applications
Authors: Lu Jianjun , Kishikawa Yoshinori , Tokinaga Shozo 
Published: August 2007

AbstractThis paper deals with the realization of feature description systems for clusters by rule generation based on genetic programming (GP) and its applications. First, the data are divided into several clusters by using conventional clustering algorithms. Then logical variables corresponding to the categorical variables are introduced, and the logical expressions using these logical variables are defined as rules to extract the targeted cluster from the dataset. The rules are improved by GP so that they are valid (become true) only for the targeted cluster. Unlike ordinary GP procedures, the fitness of individuals is defined as proportional to the number of hits inside the targeted cluster, but also to the inverse of the number of hits outside the targeted cluster. In simulation studies, the system is applied first to artificially generated samples and clusters to examine the performance of the system, and then to personal loan assessment problems, after which the evaluation of several kinds of clustering problems is summarized. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 90(9): 87– 97, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20380
Interoperability of mobile agents for ubiquitous applications
Authors: Hasegawa Tetsuo , Cho Kenta , Ohsuga Akihiko , Kumeno Fumihiro , Nakajima Shin , Honiden Shinichi 
Published: August 2007

AbstractA mobile agent is an important platform for applications for the coming ubiquitous society. Many different kinds of mobile agent platforms have been developed. However, agents from one agent platform are generally not able to migrate into another agent platform. As a solution to this problem, we propose an interoperability concept using an incarnation agent. The concept realizes logical mobility within different kinds of agent platforms. The incarnation agent extracts an agent's procedures and status, compiling them into agent platform independent format and then re‐compiling them to target agent platform format, thus enabling the process to continue. The incarnation agent also has autonomy for interoperability. It manages complex migration for interoperability, so agent's procedure can be described in simple mobile model. Moreover, the incarnation agent modifies agent's procedures as applicable to facilities of target agent platform. This paper also reports an interoperability middle‐ware and its examination. The middle‐ware is a foundation of realizing the Incarnation Agent, and the response time and network traffic overheads by the interoperability middle‐ware has been measured. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 161(4): 49–59, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20388
A study on bid strategies for electric power suppliers in bilateral market considering spot market
Authors: Hayashi Tokuhisa , Kita Hiroyuki , Tanaka Eiichi , Hasegawa Jun 
Published: August 2007

AbstractAs deregulation in the electric power industry has advanced in many countries, a spot market and a futures market for electric energy have already been formulated. In Japan, the foundation of a day‐ahead spot market is scheduled for the 2005 fiscal year. This paper presents a method to evaluate the expected profit and risk for an electric power supplier considering both spot market and bilateral market. In this paper, the Vasicek model is used to represent the fluctuations in spot price and demand in a bilateral market, and additionally, Value at Risk (VaR) is used as a risk index. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 161(4): 1–11, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20515
Mesoporous Carbon Prepared from Carbohydrate as Hard Template for Hierarchical Zeolites (Eur. J. Inorg. Chem. 25/2007)
Authors: Zhu Kake , Egeblad Kresten , Christensen Claus Hviid 
Published: August 2007

AbstractThe cover picture shows a novel method for producing mesoporous zeolite single crystals by using cheap and easily prepared porous carbon as the mesopore template. The porous carbon template was obtained by carbonization in Ar of a hydrothermally treated sucrose/ammonia mixture, and it was successfully applied as an inert carbon matrix during zeolite crystallization. After hydrothermal crystallization, combustion of the carbon embedded in the zeolite crystals yielded mesoporous zeolite single crystals. Details are discussed in the article by C. H. Christensen et al. on p. 3955 f.
meso,meso‐Linked and Triply Fused Diporphyrins with Mixed‐Metal Ions: Synthesis and Electrochemical Investigations
Authors: Fendt Leslie‐Anne , Fang Hongjuan , Plonska‐Brzezinska Marta E. , Zhang Sheng , Cheng Fuyong , Braun Christophe , Echegoyen Luis , Diederich François 
Published: August 2007

AbstractA novel series of biaryl‐type, meso,meso‐linked and planar, triply fused diporphyrin derivatives was prepared and fully characterized together with the corresponding monoporphyrin control compounds. They feature peripheral meso‐3‐cyanophenyl and meso‐3,5‐cyanophenyl groups, which have previously been shown to undergo transformation into malonates without perturbation of the porphyrin core and subsequent Bingel addition to fullerene C60. The tetrapyrrolic metal binding sites in the diporphyrin arrays are either complexed to two ZnII or CuII ions, or, in a mixed coordination, to one CuII and one ZnII ion; alternatively, one or both sites remain unoccupied. The interaction between the differentially metallated porphyrin rings was systematically investigated by UV/Vis spectroscopy and electrochemistry. Cyclic voltammetry and differential pulse voltammetry reveal that electronic communication in the diporphyrin arrays varies strongly with the mode of connection (meso,meso‐linked or triply fused), the nature of the bound metal ion, and the number of peripheral cyano groups. The electrochemical HOMO–LUMO gap in both series of diporphyrins is strongly but differentially affected by the choice of the inserted metal ions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
Econometric modelling for short‐term inflation forecasting in the euro area
Authors: Espasa Antoni , Albacete Rebeca 
Published: August 2007

AbstractThis paper examines the problem of forecasting macro‐variables which are observed monthly (or quarterly) and result from geographical and sectorial aggregation. The aim is to formulate a methodology whereby all relevant information gathered in this context could provide more accurate forecasts, be frequently updated, and include a disaggregated explanation as useful information for decision‐making. The appropriate treatment of the resulting disaggregated data set requires vector modelling, which captures the long‐run restrictions between the different time series and the short‐term correlations existing between their stationary transformations. Frequently, due to a lack of degrees of freedom, the vector model must be restricted to a block‐diagonal vector model. This methodology is applied in this paper to inflation in the euro area, and shows that disaggregated models with cointegration restrictions improve accuracy in forecasting aggregate macro‐variables. Copyright © 2007 John Wiley & Sons, Ltd.
Can panel data really improve the predictability of the monetary exchange rate model?
Authors: Westerlund Joakim , Basher Syed A. 
Published: August 2007

AbstractA common explanation for the inability of the monetary model to beat the random walk in forecasting future exchange rates is that conventional time series tests may have low power, and that panel data should generate more powerful tests. This paper provides an extensive evaluation of this power argument to the use of panel data in the forecasting context. In particular, by using simulations it is shown that although pooling of the individual prediction tests can lead to substantial power gains, pooling only the parameters of the forecasting equation, as has been suggested in the previous literature, does not seem to generate more powerful tests. The simulation results are illustrated through an empirical application. Copyright © 2007 John Wiley & Sons, Ltd.
Is there a relationship between elderly suicide rates and smoking? A cross‐national study
Authors: Shah Ajit 
Published: August 2007

AbstractBackgroundAn independent relationship between smoking cigarettes and completed suicides has been reported in several cohort and case‐control studies of younger subjects, but this relationship has rarely been examined in the elderly.MethodsThe relationship between the prevalence of smoking in males and females and suicide rates in males and females in the age‐bands 65–74 years and 75 + years was examined using national‐level aggregate data from the World Health Organisation and the United Nations Development Programme websites. In addition to univariate analysis, multivariate analysis were conducted to ascertain an independent relationship between the prevalence of smoking and elderly suicide rates.ResultsThe main findings were: (i) on univariate analysis, the prevalence of smoking in males was positively correlated with suicide rates in males aged 65–74 years and males aged 75 + years, but this relationship was absent in females and (ii) on multivariate analysis there was no independent relationship between the prevalence of smoking in males and suicide rates in males in both the elderly age‐bands.ConclusionsThere is a case for examination of the relationship between smoking and elderly suicides in individual‐level cohort or case‐control studies because of the potential methodological difficulties in cross‐national studies using national‐ level aggregate data, paucity of cohort or case‐control studies at an individual‐level in the elderly, and the observation of an independent relationship between smoking and completed suicides in individual‐level cohort and case‐control studies in younger age groups. Copyright © 2007 John Wiley & Sons, Ltd.
Selective activation around the left occipito‐temporal sulcus for words relative to pictures: Individual variability or false positives?
Authors: Wright Nicholas D. , Mechelli Andrea , Noppeney Uta , Veltman Dick J. , Rombouts Serge A.R.B. , Glensman Janice , Haynes John‐Dylan , Price Cathy J. 
Published: August 2007

AbstractWe used high‐resolution fMRI to investigate claims that learning to read results in greater left occipito‐temporal (OT) activation for written words relative to pictures of objects. In the first experiment, 9/16 subjects performing a one‐back task showed activation in ≥1 left OT voxel for words relative to pictures (P < 0.05 uncorrected). In a second experiment, another 9/15 subjects performing a semantic decision task activated ≥1 left OT voxel for words relative to pictures. However, at this low statistical threshold false positives need to be excluded. The semantic decision paradigm was therefore repeated, within subject, in two different scanners (1.5 and 3 T). Both scanners consistently localised left OT activation for words relative to fixation and pictures relative to words, but there were no consistent effects for words relative to pictures. Finally, in a third experiment, we minimised the voxel size (1.5 × 1.5 × 1.5 mm3) and demonstrated a striking concordance between the voxels activated for words and pictures, irrespective of task (naming vs. one‐back) or script (English vs. Hebrew). In summary, although we detected differential activation for words relative to pictures, these effects: (i) do not withstand statistical rigour; (ii) do not replicate within or between subjects; and (iii) are observed in voxels that also respond to pictures of objects. Our findings have implications for the role of left OT activation during reading. More generally, they show that studies using low statistical thresholds in single subject analyses should correct the statistical threshold for the number of comparisons made or replicate effects within subject. Hum Brain Mapp 2008. © 2007 Wiley‐Liss, Inc.
Noninvasive measurement of the cerebral blood flow response in human lateral geniculate nucleus with arterial spin labeling fMRI
Authors: Lu Kun , Perthen Joanna E. , Duncan Robert O. , Zangwill Linda M. , Liu Thomas T. 
Published: August 2007

AbstractTo date, functional magnetic resonance imaging (fMRI) studies of the lateral geniculate nucleus (LGN) have primarily focused on measures of the blood oxygenation level dependent (BOLD) signal. Arterial spin labeling (ASL) is an MRI method that can provide direct measures of functional cerebral blood flow (CBF) changes. Because CBF is a well‐defined physiological quantity that contributes to BOLD contrast, CBF measures can be used to improve the quantitative interpretation of fMRI studies. However, due in part to the low intrinsic signal‐to‐noise ratio of the ASL method, measures of functional CBF changes in the LGN are challenging and have not previously been reported. In this study, we demonstrate the feasibility of using ASL fMRI to measure the CBF response of the LGN to visual stimulation on a 3 T MRI system. The use of background suppression and physiological noise reduction techniques allowed reliable detection of LGN activation in all five subjects studied. The measured percent CBF response during activation ranged from 40 to 100%, assuming no interaction between the left and right LGN. Hum Brain Mapp 2008. © 2007 Wiley‐Liss, Inc.
Photocycloaddition of Six‐Membered Cyclic Enones to Propen‐2‐yl Isocyanate
Authors: Bahaji Maryam , Margaretha Paul 
Published: August 2007

AbstractOn irradiation in the presence of propen‐2‐yl isocyanate (4), six‐membered cyclic enones 3 are converted into regio‐ and stereoisomeric mixtures of [2+2] cycloadducts 5–10; the preferentially formed HT products, 5–8, can be converted into the corresponding bicyclic amines by acid hydrolysis, whereas, under these conditions, the regioisomeric HH‐isocyanato derivatives undergo a retro‐Mannich reaction.