bluuebunny/crossref_metadata_2025_split huggingface dataset:
Temporal Dynamics of Growth and Photosynthesis Suppression in Response to Jasmonate Signaling
Authors: Attaran Elham , Major Ian T. , Cruz Jeffrey A. , Rosa Bruce A. , Koo Abraham J.K. , Chen Jin , Kramer David M. , He Sheng Yang , Howe Gregg A. 
Published: May 2014

Abstract
Biotic stress constrains plant productivity in natural and agricultural ecosystems. Repression of photosynthetic genes is a conserved plant response to biotic attack, but how this transcriptional reprogramming is linked to changes in photosynthesis and the transition from growth- to defense-oriented metabolism is poorly understood. Here, we used a combination of noninvasive chlorophyll fluorescence imaging technology and RNA sequencing to determine the effect of the defense hormone jasmonate (JA) on the growth, photosynthetic efficiency, and gene expression of Arabidopsis (Arabidopsis thaliana) rosette leaves. High temporal resolution was achieved through treatment with coronatine (COR), a high-affinity agonist of the JA receptor. We show that leaf growth is rapidly arrested after COR treatment and that this effect is tightly correlated with changes in the expression of genes involved in growth, photosynthesis, and defense. Rapid COR-induced expression of defense genes occurred concomitantly with the repression of photosynthetic genes but was not associated with a reduced quantum efficiency of photosystem II. These findings support the view that photosynthetic capacity is maintained during the period in which stress-induced JA signaling redirects metabolism from growth to defense. Chlorophyll fluorescence images captured in a multiscale time series, however, revealed a transient COR-induced decrease in quantum efficiency of photosystem II at dawn of the day after treatment. Physiological studies suggest that this response results from delayed stomatal opening at the night-day transition. These collective results establish a high-resolution temporal view of how a major stress response pathway modulates plant growth and photosynthesis and highlight the utility of chlorophyll fluorescence imaging for revealing transient stress-induced perturbations in photosynthetic performance.
Plastidial Expression of Type II NAD(P)H Dehydrogenase Increases the Reducing State of Plastoquinones and Hydrogen Photoproduction Rate by the Indirect Pathway in Chlamydomonas reinhardtii
Authors: Baltz Anthony , Dang Kieu-Van , Beyly Audrey , Auroy Pascaline , Richaud Pierre , Cournac Laurent , Peltier Gilles 
Published: May 2014

Abstract
Biological conversion of solar energy into hydrogen is naturally realized by some microalgae species due to a coupling between the photosynthetic electron transport chain and a plastidial hydrogenase. While promising for the production of clean and sustainable hydrogen, this process requires improvement to be economically viable. Two pathways, called direct and indirect photoproduction, lead to sustained hydrogen production in sulfur-deprived Chlamydomonas reinhardtii cultures. The indirect pathway allows an efficient time-based separation of O2 and H2 production, thus overcoming the O2 sensitivity of the hydrogenase, but its activity is low. With the aim of identifying the limiting step of hydrogen production, we succeeded in overexpressing the plastidial type II NAD(P)H dehydrogenase (NDA2). We report that transplastomic strains overexpressing NDA2 show an increased activity of nonphotochemical reduction of plastoquinones (PQs). While hydrogen production by the direct pathway, involving the linear electron flow from photosystem II to photosystem I, was not affected by NDA2 overexpression, the rate of hydrogen production by the indirect pathway was increased in conditions, such as nutrient limitation, where soluble electron donors are not limiting. An increased intracellular starch was observed in response to nutrient deprivation in strains overexpressing NDA2. It is concluded that activity of the indirect pathway is limited by the nonphotochemical reduction of PQs, either by the pool size of soluble electron donors or by the PQ-reducing activity of NDA2 in nutrient-limited conditions. We discuss these data in relation to limitations and biotechnological improvement of hydrogen photoproduction in microalgae.
The Ethylene Receptors ETHYLENE RESPONSE1 and ETHYLENE RESPONSE2 Have Contrasting Roles in Seed Germination of Arabidopsis during Salt Stress
Authors: Wilson Rebecca L. , Kim Heejung , Bakshi Arkadipta , Binder Brad M. 
Published: May 2014

Abstract
In Arabidopsis (Arabidopsis thaliana), ethylene responses are mediated by a family of five receptors that have both overlapping and nonoverlapping roles. In this study, we used loss-of-function mutants for each receptor isoform to determine the role of individual isoforms in seed germination under salt stress. From this analysis, we found subfunctionalization of the receptors in the control of seed germination during salt stress. Specifically, loss of ETHYLENE RESPONSE1 (ETR1) or ETHYLENE INSENSITIVE4 (EIN4) leads to accelerated germination, loss of ETR2 delays germination, and loss of either ETHYLENE RESPONSE SENSOR1 (ERS1) or ERS2 has no measurable effect on germination. Epistasis analysis indicates that ETR1 and EIN4 function additively with ETR2 to control this trait. Interestingly, regulation of germination by ETR1 requires the full-length receptor. The differences in germination between etr1 and etr2 loss-of-function mutants under salt stress could not be explained by differences in the production of or sensitivity to ethylene, gibberellin, or cytokinin. Instead, etr1 loss-of-function mutants have reduced sensitivity to abscisic acid (ABA) and germinate earlier than the wild type, whereas etr2 loss-of-function mutants have increased sensitivity to ABA and germinate slower than the wild type. Additionally, the differences in seed germination on salt between the two mutants and the wild type are eliminated by the ABA biosynthetic inhibitor norflurazon. These data suggest that ETR1 and ETR2 have roles independent of ethylene signaling that affect ABA signaling and result in altered germination during salt stress.
Analyzing energy‐efficient configurations in hexapod robots for demining applications
Authors: Sanz‐Merodio D. , Garcia E. , Gonzalez‐de‐Santos P. 
Published: May 2014

PurposeReducing energy consumption in walking robots is an issue of great importance in field applications such as humanitarian demining so as to increase mission time for a given power supply. The purpose of this paper is to address the problem of improving energy efficiency in statically stable walking machines by comparing two leg, insect and mammal, configurations on the hexapod robotic platform SILO6.Design/methodology/approachDynamic simulation of this hexapod is used to develop a set of rules that optimize energy expenditure in both configurations. Later, through a theoretical analysis of energy consumption and experimental measurements in the real platform SILO6, a configuration is chosen.FindingsIt is widely accepted that the mammal configuration in statically stable walking machines is better for supporting high loads, while the insect configuration is considered to be better for improving mobility. However, taking into account the leg dynamics and not only the body weight, different results are obtained. In a mammal configuration, supporting body weight accounts for 5 per cent of power consumption while leg dynamics accounts for 31 per cent.Originality/valueAs this paper demonstrates, the energy expended when the robot walks along a straight and horizontal line is the same for both insect and mammal configurations, while power consumption during crab walking in an insect configuration exceeds power consumption in the mammal configuration.
Control system design for heavy duty industrial robot
Authors: You Wei , Kong Minxiu , Sun Lining , Diao Yanbin 
Published: May 2014

PurposeThe purpose of this paper is to present a control system for a heavy duty industrial robot, including both the control structure and algorithm, which was designed and tested.Design/methodology/approachAn industrial PC with TwinCAT real‐time system is chosen as the motion control unit; EtherCAT is used for command transmission. The whole system has a decoupled and centralized control structure. A novel optimal motion generation algorithm based on modified cubic spline interpolation is illustrated. The execution time and work were chosen as the objective function. The constraints are the limits of torque, velocity and jerk. The motion commands were smooth enough throughout the execution period. By using the Lagangue equation and assumed modes methods, a dynamic model of heavy duty industrial robots is built considering the elastic of both joints and links. After that a compound control algorithm based on singular perturbation theory was designed for the servo control loop.FindingsThe final experimental results showed that the control commands and algorithms could easily be calculated and transmitted in one sample unit. Both the motion generation and servo control algorithm greatly improved the control performance of the robot.Research limitations/implicationsAll parts of the control algorithm can be computed on‐line except the optimal motion generation part. The motion generation part is time consuming (about 2.5 seconds), which can only be performed off‐line. Hence future work will focus on improving the efficiency of this algorithm; therefore it could be performed online, increasing the robot's overall robustness and adaptability.Originality/valueAiming at the internal and external causes that limit the dynamic performance of heavy duty industrial robots, this paper proposes a realizable scheme of control system and includes both the control structure and algorithms. A novel optimal motion generation algorithm is presented.
Improving the capability of a redundant robotic cell for cast parts finishing
Authors: Sabourin Laurent , Robin Vincent , Gogu Grigore , Fauconnier Jean‐Michel 
Published: May 2014

PurposePrecision aluminium moulding makes possible the production of large‐size, complex and high‐technology cast parts. However, industrial requirements linked to economic and safety reasons call into question the manual performance of finishing operations. The purpose of this paper is to enhance industrial robot applications by using vision and redundancy optimization to improve their capability.Design/methodology/approachAfter having presented the concepts associated with machine and kinematics capability, the paper first describes the finishing constraints related to the process and the study of inaccuracy factors. Adjusting the trajectory by vision minimizes some inaccuracy factors but does not take into account the structure loading. Therefore, the authors present the optimization, kinematics and precision criteria as well as the multi‐objective method developed by integrating the loading aspect. This method has been verified by simulation and the results validated on industrial parts.FindingsThe paper presents an improvement in machine capacities based on redundancy and an optical 3D measurement system. It develops the strategies, sensors and cell architecture to perform finishing operations.Research limitations/implicationsThe finishing of high‐technology structural cast parts requires the completion of the machining and polishing processes adapted to each part. The choice was made to develop a robotic cell dedicated to integrating specific features, in contrast to machine tools.Practical implicationsThis study was carried out within the framework of the Eureka SANDCAST project in cooperation with the Alcan group, specialized in high‐technology moulded aluminum parts.Originality/valueThe paper presents an approach to robotic cell capability improvement. The robotic cell is dedicated to finishing operations, by machining and polishing large cast aluminum parts; the objectives are to improve machine capability and kinematics capacity with vision and redundancy management.
A multi‐phase systematic framework for performance appraisal of architectural design studio facilities
Authors: Hassanain Mohammad A. , Alhaji Mohammed Mohammed , Cetin Murat 
Published: May 2014

PurposeThe objectives of this paper are to present the development of an indicative multi‐phase systematic framework for performance appraisal of architectural design studio facilities, and to present the findings of the post‐occupancy conditions of an architectural design studio facility as a case study to demonstrate the applicability of the developed framework.Design/methodology/approachThe authors carried out a number of activities. These include reviewing the published literature to address the significance of the architectural design studio as a resource for students majoring in architectural design, and ascertaining the significance of post‐occupancy evaluation as a performance appraisal methodology in educational facilities. On the development of the proposed framework, the authors carried out a case study in one of the studios of the Architecture Department at King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia. The authors utilized a series of data collection methods, including photographic documentation, observations through walkthrough inspection, questionnaires and interviews.FindingsThe developed framework consists of four phases. It entails identifying the performance requirements of the architectural design studio; collecting data – through conducting walkthrough inspection, questionnaire survey and interviews – to ascertain the present performance level of the architectural design studio; analyzing the data gathered from the preceding steps and subsequent reporting of findings on the degree of user satisfaction with the architectural design studio space and facilities; and developing a plan of actions in the form of recommendations to improve the conditions of the evaluated design studio. The case study served as a validation of the developed performance appraisal framework.Originality/valueThe architectural design studio is known to be the place where students majoring in architectural design generate, review and display their design projects. Previous research on the performance appraisal of educational facilities indicates that the comfort of the architectural design studio space is a significant aspect to be considered and maintained for the success of the architectural education process. The paper provides a systematic approach for evaluating the major performance requirements of an architectural design studio. It is of practical value to space planners, design professionals, facility managers and administrators involved in the planning, design, operation and management of such facilities.
Making change happen: recollections of a systems professional
Authors: Schwaninger Markus 
Published: May 2014

PurposeThe purpose of this paper is to demonstrate the potential of making the systems approach fertile for the future of our world(s).Design/methodology/approachUnderpinned by a significant case study, the idea of the paper is to show how a systems study changed the basis for deciding on an incisive interference planned for a lovely alpine valley. The study builds on a qualitative conceptual model and reverts to a quantitative, system‐dynamics simulation model, as well as standard economic evaluation methods. The decision process is explained with its outcomes and implications.FindingsThe study found, among others, the following concrete result: The optimal variant (Case B) required an additional investment for its realization. According to the calculations that were carried out, the period needed for the amortization of the pertinent amount was found to be no more than 0.9 to 1.6 years. It became clear that the most expensive variant was indeed a very good business proposition for the Austrian Republic.Practical implicationsThe results of the study were integrated into the General Traffic Plan of the Austrian Ministry of Transportation, Innovation and Technology, i.e. the study's conclusions obtained legal status. This meant a shift toward a long‐term orientation. In addition, new insights for the realization of similar studies and interventions were gained.Originality/valueThe study described in the paper shows both rigor and relevance. It illuminates a methodology that combines the qualitative and the quantitative, as well as careful analysis and powerful synthesis. Beyond the methods and procedures used in the inquiry, its outcomes and impact on the concrete system under study are demonstrated.
“At scale” author name matching with Hadoop/MapReduce
Authors: Powell James , Collins Linn , Eberhardt Ariane , Izraelevitz David , Roman Jorge , Dufresne Thomas , Scott Mark , Blake Miriam , Grider Gary 
Published: May 2014

PurposeThe purpose of this paper is to describe a process for extracting and matching author names from large collections of bibliographic metadata using the Hadoop implementation of MapReduce. It considers the challenges and risks associated with name matching on such a large‐scale and proposes simple matching heuristics for the reduce process. The resulting semantic graphs of authors link names to publications, and include additional features such as phonetic representations of author last names. The authors believe that this achieves an appropriate level of matching at scale, and enables further matching to be performed with graph analysis tools.Design/methodology/approachA topically‐focused collection of metadata records describing peer‐reviewed papers was generated based upon a search. The matching records were harvested and stored in the Hadoop Distributed File System (HDFS) for processing by hadoop. A MapReduce job was written to perform coarse‐grain author name matching, and multiple papers were matched with authors when the names were very similar or identical. Semantic graphs were generated so that the graphs could be analyzed to perform finer grained matching, for example by using other metadata such as subject headings.FindingsWhen performing author name matching at scale using MapReduce, the heuristics that determine whether names match should be limited to the rules that yield the most reliable results for matching. Bad rules will result in lots of errors, at scale. MapReduce can also be used to generate or extract other data that might help resolve similar names when stricter rules fail to do so. The authors also found that matching is more reliable within a well‐defined topic domain.Originality/valueLibraries have some of the same big data challenges as are found in data‐driven science. Big data tools such as hadoop can be used to explore large metadata collections, and these collections can be used as surrogates for other real world, big data problems. MapReduce activities need to be appropriately scoped so as to yield good results, while keeping an eye out for problems in code which can be magnified in the output from a MapReduce job.
Job search on the internet and its outcome
Authors: Suvankulov Farrukh , Chi Keung Lau Marco , Ho Chi Chau Frankie 
Published: May 2014

PurposeThis paper aims to estimate the impact of job search on the internet on the probability of re‐employment and the duration of unemployment spells.Design/methodology/approachThe study uses national panel datasets from Germany (SOEP 2003‐2007) and South Korea (KLIPS 1996‐2006) to estimate probit and Hausman‐Taylor IV models of the impact of job search on the internet on the probability of re‐employment. The study also explores duration analysis with the aim of estimating the impact of internet job search on the duration of unemployment.FindingsIn Germany and South Korea job seekers who used the internet had a 7.1 and 12.7 percentage point higher probability, respectively, of being re‐employed in the next 12 months. Furthermore, job seekers who used the internet had a shorter duration of unemployment in both Germany and South Korea.Practical implicationsOver the past decade, internet penetration rates and use of the internet in job search have risen sharply across the world. The internet has significantly changed the job application process and improved the channels of communication between employers and job seekers. The findings of the research indicate that the internet is beneficial and should be a part of job search efforts.Originality/valueThe contribution of this study is twofold. It is the first study to use panel datasets to analyze the link between internet use and job search outcomes. Therefore, the results are robust to unobserved heterogeneity problems. The study also addresses the issue of endogeneity of job search on the internet by using the Hausman‐Taylor IV model.
Factor analysis of partners' commitment to risk management in public‐private partnership projects
Authors: Jin Xiao‐Hua , Zhang Guomin , Yang Rebecca J. 
Published: May 2014

PurposeThe purpose of this paper is to investigate and uncover key determinants that could explain partners' commitment to risk management in public‐private partnership projects so that partners' risk management commitment is taken into the consideration of optimal risk allocation strategies.Design/methodology/approachBased on an extensive literature review and an examination of the purchasing power parity (PPP) market, an industry‐wide questionnaire survey was conducted to collect the data for a confirmatory factor analysis. Necessary statistical tests are conducted to ensure the validity of the analysis results.FindingsThe factor analysis results show that the procedure of confirmatory factor analysis is statistically appropriate and satisfactory. As a result, partners' organizational commitment to risk management in public‐private partnerships can now be determined by a set of components, namely general attitude to a risk, perceived one's own ability to manage a risk, and the perceived reward for bearing a risk.Practical implicationsIt is recommended, based on the empirical results shown in this paper, that, in addition to partners' risk management capability, decision‐makers, both from public and private sectors, should also seriously consider partners' risk management commitment. Both factors influence the formation of optimal risk allocation strategies, either by their individual or interacting effects. Future research may therefore explore how to form optimal risk allocation strategies by integrating organizational capability and commitment, the determinants and measurement of which have been established in this study.Originality/valueThis paper makes an original contribution to the general body of knowledge on risk allocation in large‐scale infrastructure projects in Australia adopting the procurement method of public‐private partnership. In particular, this paper has innovatively established a measurement model of organisational commitment to risk management, which is crucial to determining optimal risk allocation strategies and in turn achieving project success. The score coefficients of all obtained components can be used to construct components by linear combination so that commitment to risk management can be measured. Previous research has barely focused on this topic.