bluuebunny/crossref_metadata_2025_split huggingface dataset:
CeratozetesandCeratozetoides(Acari: Oribatida: Ceratozetidae) of North America
Authors: Behan-Pelletier Valerie M. , Eamer Barbara 
Published: November 2009

AbstractThe oribatid mite genusCeratozetesBerlese is represented in America north of Mexico by 21 previously described species known from forest, grassland, subarctic and arctic soils and litter, and canopy habitats. The closely related genusCeratozetoidesShaldybina is represented in America north of Mexico only byC. cisalpinus(Berlese). Three new species ofCeratozetesfrom North America are described:C. biporosussp. nov.from forest habitats of southeastern North America,C. cyclopeasp. nov.from montane habitats in western North America, andC. pseudomediocrissp. nov.from forest habitats of western North America. A detailed revised diagnosis is given forCeratozetes,Ceratozetoides, all previously described species ofCeratozetes(C. angustus(Banks),C. borealisBehan-Pelletier,C. cuspidatusJacot,C. enodis(Ewing),C. fjellbergiBehan-Pelletier,C. gracilisMichael,C. kutchinBehan-Pelletier,C. longispinusJacot,C. mediocris(Berlese),C. oresbiosBehan-Pelletier,C. pacificusBehan-Pelletier,C. parvulusSellnick,C. spitsbergensisThor,C. subaquila(Ewing),C. subinconspicuus(Berlese),C. thienemanniWillmann,C. virginicus(Banks), andC. watertonensisBehan-Pelletier), andCeratozetoides cisalpinus.Ceratozetes figuratus(Ewing) andC. zeteki(Ewing) are considered junior subjective synonyms ofC. enodis(Ewing)syn. nov., andC. inupiaqBehan-Pelletier is transferred to Mycobatidae asCyrtozetes inupiaq(Behan-Pelletier)comb. nov. New distribution records are given forCeratozetoides cisalpinusandCeratozetes angustus,C. borealis,C. cuspidatus,C. gracilis,C. mediocris,C. longispinus,C. oresbios,C. pacificus,C. parvulus,C. thienemanni,C. virginicus, andC. watertonensis.A diagnostic key is provided to adults of theCeratozetesandCeratozetoidesspecies now known for America north of Mexico. An analysis of the systematic relationships of 23 of these species based on adult characters indicates thatCeratozetes, excludingCeratozetoides, is paraphyletic. The clade that includesCeratozetoides cisalpinusand 15 species ofCeratozetesincludes most species for which immatures are known. One sister clade includesCeratozetes cyclopea,C. enodis, andC. fjellbergiand another includesC. kutchin, C. parvulus, andC. thienemanni.The decision whether or not these 6 species should be retained inCeratozetessensu strictoawaits discovery of their immatures and molecular analysis.
Synthesis–Structure–Property Relationships for Hyperbranched Aminosilica CO2 Adsorbents
Authors: Drese Jeffrey H. , Choi Sunho , Lively Ryan P. , Koros William J. , Fauth Daniel J. , Gray McMahan L. , Jones Christopher W. 
Published: November 2009

AbstractHyperbranched aminosilica (HAS) adsorbents are prepared via the ring‐opening polymerization of aziridine in the presence of mesoporous silica SBA‐15 support. The aminopolymers are covalently bound to the silica support and capture CO2 reversibly in a temperature swing process. Here, a range of HAS materials are prepared with different organic loadings. The effects of organic loading on the structural properties and CO2 adsorption properties of the resultant hybrid materials are examined. The residual porosity in the HAS adsorbents after organic loading, as well as the molecular weights and degrees of branching for the separated aminopolymers, are determined to draw a relationship between adsorbent structure and performance. Humid adsorption working capacities and apparent adsorption kinetics are determined from experiments in a packed‐bed flow system monitored by mass spectrometry. Dry adsorption isotherms are presented for one HAS adsorbent with a high amine loading at 35 and 75 °C. These combined results establish the relationships between adsorbent synthesis, structure, and CO2 adsorption properties of the family of HAS materials.
Recombinant Δ4,5‐Steroid 5 β‐Reductases as Biocatalysts for the Reduction of Activated CC‐Double Bonds in Monocyclic and Acyclic Molecules
Authors: Burda Edyta , Kraußer Marina , Fischer Gabriele , Hummel Werner , Müller‐Uri Frieder , Kreis Wolfgang , Gröger Harald 
Published: November 2009

AbstractIt was found that Δ4,5‐steroid 5β‐reductases are capable of reducing also small molecules bearing an activated CC double bond such as monocyclic enones and acyclic enoate esters. As preferred Δ4,5‐steroid 5β‐reductase (5β‐StR) for this purpose, 5β‐StR from Arabidopsis thaliana was used. In part, enzyme activities are even higher than that for progesterone. Successful preliminary biotransformations with enzymatic in situ cofactor recycling were also carried out. When using the prochiral compound isophorone as a substrate, a high enantioselective reaction course (>99% ee) was observed.
Highly Efficient Ion‐Tagged Catalyst for the Enantioselective Michael Addition of Aldehydes to Nitroalkenes
Authors: Lombardo Marco , Chiarucci Michel , Quintavalla Arianna , Trombini Claudio 
Published: November 2009

AbstractThe ion‐tagged diphenylprolinol silyl ether 6 very efficiently catalyzes the asymmetric Michael addition of aliphatic aldehydes to nitroalkenes with ee of up to>99.5% at low catalyst loadings (0.25–5 mol%) and using only a slight excess of aldehydes (1.2–2 equiv.). This new organocatalyst can be used with the same outstanding efficiency in a wide variety of solvents and reaction conditions.
Computational study of staged membrane reactor configurations for methane steam reforming. I. Optimization of stage lengths
Authors: Caravella Alessio , Di Maio Francesco Paolo , Di Renzo Alberto 
Published: November 2009

AbstractThis article and Part II report a computational study carried out to analyze the performance achievable using a staged membrane reactor in the methane steam reforming process to produce high purity hydrogen. A reaction/separation unit in which reactive stages are laid out in series to permeative stages already proposed in literature (Caravella et al., J Memb Sci. 2008;321:209–221) is modified here to increase its flexibility. The improvement includes the consideration of the Pd‐based membrane along the entire length. Two‐ and ten‐staged reactors are examined in terms of methane conversion, hydrogen recovery factor and hydrogen recovery yield, considering co‐ and counter‐current flow configurations. Individual stage lengths are obtained by maximizing either methane conversion or hydrogen recovery yield, comparing the results to the ones of an equivalent traditional reactor and a conventional membrane reactor. The analysis allows demonstrating that the counter‐current configuration leads to significant improvements in the hydrogen recovery, but proves almost irrelevant with respect to methane conversion. The influence of the number of stages and the amount of catalyst is quantified in the accompanying part II article. © 2009 American Institute of Chemical Engineers AIChE J, 2010
On the appropriate modeling of process plant water systems
Authors: Faria Débora C. , Bagajewicz Miguel J. 
Published: November 2009

AbstractThe definition of the water/wastewater allocation problem is discussed as it was originally defined by Takama et al.1 how this concept was modified, and sometimes simplified, through time, as well as additional issues that is believed are still not properly addressed. A few attempts are reviewed where parts are pointed out, and the addition of water pretreatment units are discussed, and further investigation in to the impact that proper modeling has on predictions of freshwater consumption, total annual cost and zero discharge cycles. © 2009 American Institute of Chemical Engineers AIChE J, 2010
Modeling and predictive control using fuzzy logic: Application for a polymerization system
Authors: Lima Nádson M. N. , Liñan Lamia Zuñiga , Filho Rubens Maciel , Maciel Maria R. Wolf , Embiruçu Marcelo , Grácio Filipe 
Published: November 2009

AbstractIn this study, a predictive control system based on type Takagi‐Sugeno fuzzy models was developed for a polymerization process. Such processes typically have a highly nonlinear dynamic behavior causing the performance of controllers based on conventional internal models to be poor or to require considerable effort in controller tuning. The copolymerization of methyl methacrylate with vinyl acetate was considered for analysis of the performance of the proposed control system. A nonlinear mathematical model which describes the reaction plant was used for data generation and implementation of the controller. The modeling using the fuzzy approach showed an excellent capacity for output prediction as a function of dynamic data input. The performance of the projected control system and dynamic matrix control for regulatory and servo problems were compared and the obtained results showed that the control system design is robust, of simple implementation and provides a better response than conventional predictive control. © 2009 American Institute of Chemical Engineers AIChE J, 2010
A superstructure‐based optimal synthesis of PSA cycles for post‐combustion CO2 capture
Authors: Agarwal Anshul , Biegler Lorenz T. , Zitney Stephen E. 
Published: November 2009

AbstractRecent developments have shown pressure/vacuum swing adsorption (PSA/VSA) to be a promising option to effectively capture CO2 from flue gas streams. In most commercial PSA cycles, the weakly adsorbed component in the mixture is the desired product, and enriching the strongly adsorbed CO2 is not a concern. On the other hand, it is necessary to concentrate CO2 to high purity to reduce CO2 sequestration costs and minimize safety and environmental risks. Thus, it is necessary to develop PSA processes specifically targeted to obtain pure strongly adsorbed component. A multitude of PSA/VSA cycles have been developed in the literature for CO2 capture from feedstocks low in CO2 concentration. However, no systematic methodology has been suggested to develop, evaluate, and optimize PSA cycles for high purity CO2 capture. This study presents a systematic optimization‐based formulation to synthesize novel PSA cycles for a given application. In particular, a novel PSA superstructure is presented to design optimal PSA cycle configurations and evaluate CO2 capture strategies. The superstructure is rich enough to predict a number of different PSA operating steps. The bed connections in the superstructure are governed by time‐dependent control variables, which can be varied to realize most PSA operating steps. An optimal sequence of operating steps is achieved through the formulation of an optimal control problem with the partial differential and algebraic equations of the PSA system and the cyclic steady state condition. Large‐scale optimization capabilities have enabled us to adopt a complete discretization methodology to solve the optimal control problem as a large‐scale nonlinear program, using the nonlinear optimization solver IPOPT. The superstructure approach is demonstrated for case studies related to post‐combustion CO2 capture. In particular, optimal PSA cycles were synthesized, which maximize CO2 recovery for a given purity, and minimize overall power consumption. The results show the potential of the superstructure to predict PSA cycles with up to 98% purity and recovery of CO2. Moreover, for recovery of around 85% and purity of over 90%, these cycles can recover CO2 from atmospheric flue gas with a low power consumption of 465 k Wh tonne−1 CO2. The approach presented is, therefore, very promising and quite useful for evaluating the suitability of different adsorbents, feedstocks, and operating strategies for PSA, and assessing its usefulness for CO2 capture. Published 2009 American Institute of Chemical Engineers AIChE J, 2010
Viscous co‐current downward Taylor flow in a square mini‐channel
Authors: Keskin Özge , Wörner Martin , Soyhan Hakan S. , Bauer Tobias , Deutschmann Olaf , Lange Rüdiger 
Published: November 2009

AbstractThis article presents a computational study of the co‐current downward Taylor flow of gas bubbles in a viscous liquid within a square channel of 1 mm hydraulic diameter. The three‐dimensional numerical simulations are performed with an in‐house computer code, which is based on the volume‐of‐fluid method with interface reconstruction. The computed (always axi‐symmetric) bubble shapes are validated by experimental flow visualizations for varying capillary number. The evaluation of the numerical results for a series of simulations reveals the dependence of the bubble diameter and the interfacial area per unit volume on the capillary number. Correlations between bubble velocity and total superficial velocity are also provided. The present results are useful to estimate the values of the bubble diameter, the liquid film thickness and the interfacial area per unit volume from given values of the gas and liquid superficial velocities. © 2009 American Institute of Chemical Engineers AIChE J, 2010
Influence of adding or deleting items and sources on the h‐index
Authors: Egghe Leo 
Published: November 2009

AbstractAdding or deleting items such as self‐citations has an influence on the h‐index of an author. This influence will be proved mathematically in this article. We hereby prove the experimental finding in E. Gianoli and M.A. Molina‐Montenegro (2009) that the influence of adding or deleting self‐citations on the h‐index is greater for low values of the h‐index. Why this is logical also is shown by a simple theoretical example. Adding or deleting sources such as adding or deleting minor contributions of an author also has an influence on the h‐index of this author; this influence is modeled in this article. This model explains some practical examples found in X. Hu, R. Rousseau, and J. Chen (in press).
Referencing in the humanities and its implications for citation analysis
Authors: Hellqvist Björn 
Published: November 2009

AbstractThis article studies citation practices in the arts and humanities from a theoretical and conceptual viewpoint, drawing on studies from fields like linguistics, history, library & information science, and the sociology of science. The use of references in the humanities is discussed in connection with the growing interest in the possibilities of applying citation analysis to humanistic disciplines. The study shows how the use of references within the humanities is connected to concepts of originality, to intellectual organization, and to searching and writing. Finally, it is acknowledged that the use of references is connected to stylistic, epistemological, and organizational differences, and these differences must be taken into account when applying citation analysis to humanistic disciplines.
CD40/CD40L signaling and its implication in health and disease
Authors: Chatzigeorgiou Antonios , Lyberi Maria , Chatzilymperis Gregorios , Nezos Adrianos , Kamper Elli 
Published: November 2009

AbstractCD40, a transmembrane receptor of the tumor necrosis factor gene superfamily is expressed on a variety of cells, such as monocytes, B‐cells, antigen presenting cells, endothelial, smooth muscle cells, and fibroblasts. The interaction between CD40 and CD40 ligand (CD40L) enhances the expression of cytokines, chemokines, matrix metalloproteinases, growth factors, and adhesion molecules, mainly through the stimulation of nuclear factor kappa B. The aim of this review is to summarize the molecular and cellular characteristics of CD40 and CD40L, the mechanisms that regulate their expression, the cellular responses they stimulate and finally their implication in the pathophysiology of inflammatory and autoimmune diseases. © 2009 International Union of Biochemistry and Molecular Biology, Inc.
Design and implementation of a SCADA‐controlled MTMPS as a mechatronics training unit
Authors: Yenitepe Recep 
Published: November 2009

AbstractRecently, economical aspects of education have become an important issue for everyone who is in the educational sector since they have to operate on restricted budgets. Therefore, the limited resources of educational institutions have necessitated the development of novel teaching materials. The aim of this study is to design and implement a low‐cost compact Modular Production System controlled by a Supervisory Control and Data Acquisition (SCADA) system. This compact MPS has the following stations: identification, transport, processing, sorting, and storing. All these stations are placed on a common platform and connected to the same PLC system. Therefore, it is proposed that this system can be called as “Multitask Modular Production System” (MTMPS). The benefits of the realized MTMPS are threefold. This system resulted in savings both for occupied space and cost of equipment. Savings for occupied space is nearly 70% while it is about 80% for the cost of equipment. The duration of training are also reduced by 60% with the implementation of this MTMPS. This study also includes evaluation of training course conducted on the MTMPS and conventional MPS units. As a result of this training, which employs the MTMPS unit, the students were expected to enhance their various cognitive skills. © 2009 Wiley Periodicals, Inc. Comput Appl Eng Educ 20: 247–254, 2012
Pulmonary artery stents: Long‐term follow‐up
Authors: Law Mark A. , Shamszad Pirouz , Nugent Alan W. , Justino Henri , Breinholt John P. , Mullins Charles E. , Ing Frank F. 
Published: November 2009

AbstractObjectives: Determine the long‐term outcomes of branch pulmonary artery (PA) stents. Background: PA stents in congenital heart disease effectively relieve stenoses in the short‐term. Published long‐term data are limited. Methods: Patients enrolled in an FDA IDE protocol from 1989–92 were included. Clinical follow‐up and catheterization data were evaluated. Patients were included if >5 year follow‐up data was available or if mortality occurred following the initial procedure. Results: There were five deaths: four due to progression of their underlying heart disease, and one from a complication during a follow‐up catheterization. Clinical data for 43 surviving patients demonstrated 39 patients (91%) are in NYHA class I or II. Seven patients underwent surgical intervention during the follow‐up period (five RV‐PA conduit, two Fontan revisions), but none addressed PA stenosis. Final repeat catheterizations were performed in 36 patients (55 stents) 7.2 ± 4.3 years post stent insertion with 1.2 ± 0.9 further procedures with stent dilations. In this subgroup, the minimum vessel diameter increased from 4.7 ± 1.8 to 13.4 ± 2.4 mm (P < 0.001), and the pressure gradient improved from 41 ± 25 to 9 ± 11 mm Hg (P < 0.001). Higher initial gradient and smaller balloons were associated with a final stent diameter of <14 mm (P = 0.030 and 0.046). Jailed vessels occurred in 49% of stents with abnormal angiographic flow in 18/55. Six repeat catheterizations resulted in complications, including the one procedural death. Conclusion: Stents implants for PA stenoses provide effective improvement in vessel caliber in the long‐term. Although repeat interventions are necessary, this procedure reduces RV pressure and provides an important alternative to surgery for residual PA obstruction. © 2009 Wiley‐Liss, Inc.
CT angiography for assessment of intracranial basilar apex aneurysm neck diameter reduction poststenting for treatment planning
Authors: Adel Joseph G. , Sherma Arun K. , Bendok Bernard R. 
Published: November 2009

AbstractBackground and Purpose: Once a contraindication for a neuro‐interventional therapeutic approach, some wide‐necked aneurysms can now be treated with stent assistance. Radiologically assessing the impact of a stent on the neck of a wide‐neck bifurcation, aneurysm remains a challenge however. Methods: A 76‐year‐old female with a large irregular basilar apex aneurysm was referred for endovascular treatment. Angiographic imaging revealed a basilar apex aneurysm with a 6‐mm neck and a 14‐mm dome. The decision was made to perform staged stent‐assisted coiling of the aneurysm. In the interim time, although the stent was allowed to heal in place, a CTA was done to assess the positioning of the stent and the degree of neck narrowing. Results: The CTA showed that the neck had been narrowed from 6 to 2 mm hence making endovascular coiling feasible. Conclusion: Our case illustrates the use of CTA poststent deployment to visualize the change in aneurysm neck caliber precoil embolization. © 2009 Wiley‐Liss, Inc.
Atrioventricular block after transcatheter ASD closure using the Amplatzer septal occluder: Risk factors and recommendations
Authors: Al‐Anani Shada J. , Weber Howard , Hijazi Ziyad M. 
Published: November 2009

AbstractTranscatheter device closure of atrial septal defects is now considered an alternative option to open heart surgery with good short‐term and long‐term results (Du et al., J Am Coll Cardiol 2002;39:1836–1844, Chessa et al., J Am Coll Cardiol 2002;39:1061–1065); in comparison with surgical closure, the complication rate is lower (Du et al., J Am Coll Cardiol 2002;39:1836–1844). Arrhythmias are known infrequent complications of device closure. However, complete heart block is a rare complication of both treatment modalities (Chessa et al., J Am Coll Cardiol 2002;39:1061–1065). We report two patients who developed atrioventricular (AV) block within 48 hr after uncomplicated device closure of ASD using the Amplatzer septal occluder (ASO) device. Despite trials of high dose steroids and non‐steroidal anti‐inflammatory agents in both patients, the response was inadequate and by the end of the first week, both patients were ultimately sent for surgical removal of their devices with complete resolution of their atrioventricular conduction abnormalities. We discuss the possible etiology and risk factors of AV block and propose recommendations for management of such a complication. © 2009 Wiley‐Liss, Inc.
Neonatal balloon aortic valvuloplasty—predictive value of current risk score algorithms for treatment strategies
Authors: Eicken Andreas , Georgiev Stanimir , Balling Gunter , Schreiber Christian , Hager Alfred , Hess John 
Published: November 2009

AbstractBackground: Neonatal valvular aortic stenosis (AoS) represents a spectrum of different degrees of hypoplasia and malformation of all left heart structures. Uncertainty exists on threshold values for biventricular circulation of newborns with critical AoS. Our aim was to assess the predictive value of current risk scores for treatment strategies in critical AoS. Methods and Results: The echocardiograms of all newborns with AoS treated by balloon valvuloplasty (AoVP) or Norwood operation between January 2006 and September 2008 were reviewed retrospectively and the Rhodes‐, Colan‐score and the univentricular repair survival advantage (UVR‐SA) tool were applied. The results were compared to the actual outcome. Out of 28 patients 19 were treated by an initial AoVP and nine by an initial Norwood operation. In three a secondary Norwood operation was done. According to the Rhodes‐score 24 patients should have been treated by a univentricular strategy but 12 of them (50%) live with biventricular circulation. The Colan‐score resulted in 19 univentricular decisions and 7 (37%) of these patients now live with biventricular circulation. Applying the UVR‐SA tool 2/12 (17%) patients predicted for a univentricular strategy received successful biventricular circulation and 2/16 (12%) of the suggested biventricular patients have a univentricular circulation. Hence, 14/28 (50%) patients had discordant treatment decisions. Conclusion: No prospectively tested criteria for patient selection (biventricular vs. univentricular) are available for critically ill newborns with AoS. Retrospective application of the current risk scores showed unsatisfactory results. Treatment decisions are based on local experience and expertise. © 2009 Wiley‐Liss, Inc.