bluuebunny/crossref_metadata_2025_split huggingface dataset:
Early sex-chromosome evolution in the diploid dioecious plantMercurialis annua
Authors: Veltsos Paris , Ridout Kate E. , Toups Melissa A. , González-Martínez Santiago C. , Muyle Aline , Emery Olivier , Rastas Pasi , Hudzieczek Vojtech , Hobza Roman , Vyskot Boris , Marais Gabriel A.B. , Filatov Dmitry A. , Pannell John R. 
Published: February 2017

AbstractSuppressed recombination around a sex-determining locus allows divergence between homologous sex chromosomes and the functionality of their genes. Here, we reveal patterns of the earliest stages of sex-chromosome evolution in the diploid dioecious herbMercurialis annuaon the basis of cytological analysis,de novogenome assembly and annotation, genetic mapping, exome resequencing of natural populations, and transcriptome analysis. Both genetic mapping and exome resequencing of individuals across the species range independently identified the largest linkage group, LG1, as the sex chromosome. Although the sex chromosomes ofM. annuaare karyotypically homomorphic, we estimate that about a third of the Y chromosome has ceased recombining, a region containing 568 transcripts and spanning 22.3 cM in the corresponding female map. Patterns of gene expression hint at the possible role of sexually antagonistic selection in having favored suppressed recombination. In total, the genome assembly contained 34,105 expressed genes, of which 10,076 were assigned to linkage groups. There was limited evidence of Y-chromosome degeneration in terms of gene loss and pseudogenization, but sequence divergence between the X and Y copies of many sex-linked genes was higher than betweenM. annuaand its dioecious sister speciesM. huetiiwith which it shares a sex-determining region. The Mendelian inheritance of sex in interspecific crosses, combined with the other observed pattern, suggest that theM. annuaY chromosome has at least two evolutionary strata: a small old stratum shared withM. huetii, and a more recent larger stratum that is probably unique toM. annuaand that stopped recombining about one million years ago.Article summaryPlants that evolved separate sexes (dioecy) recently are ideal models for studying the early stages of sex-chromosome evolution. Here, we use karyological, whole genome and transcriptome data to characterize the homomorphic sex chromosomes of the annual dioecious plantMercurialis annua. Our analysis reveals many typical hallmarks of dioecy and sex-chromosome evolution, including sex-biased gene expression and high X/Y sequence divergence, yet few premature stop codons in Y-linked genes and very little outright gene loss, despite 1/3 of the sex chromosome having ceased recombination in males. Our results confirm that theM. annuaspecies complex is a fertile system for probing early stages in the evolution of sex chromosomes.
Exploring the adoption of mobile internet services by socioeconomically disadvantaged people
Authors: Ma Dandan , Tina Du Jia , Cen Yonghua , Wu Peng 
Published: February 2017

Purpose
The purpose of this paper is to identify enablers and inhibitors to the adoption of mobile internet services by socioeconomically disadvantaged people: an understudied population adversely affected by digital inequality.

Design/methodology/approach
A qualitative study combining a questionnaire and semi-structured interviews. In total, 32 socioeconomically disadvantaged people explored mobile lottery services and subsequently were asked a series of semi-structured questions about their perceptions of the technology.

Findings
Users’ attitudes toward mobile internet services were ambivalent. They experienced some advantages of smartphones (including escaping spatiotemporal constrains, fashionableness, privacy, and cost-effectiveness) and conceived of mobile internet services in terms of social advantages (including their ubiquitous nature, fitting in socially and fear of being “left behind”). However, they also experienced barriers and concerns, such as limited mobile data packages, external barriers from mobile services (including security concerns, complex online help tutorials, irrelevant pop-ups, and a lack of personalized services) and internal psychological barriers (including technophobia, self-concept, and habitus).

Research limitations/implications
The findings are of limited generalizability due to the small size of the sample. However, the study has implications for understanding the acceptance of technology among socioeconomically disadvantaged people.

Social implications
The study has social implications for bridging digital inequality in terms of socioeconomic status.

Originality/value
While previous studies have primarily focused on enablers of adopting mobile internet services by active users, this study reveals both the promise of and the barriers to the use of such services by inactive users who comprise an under-served population.
Does culture matter in effectiveness of social media marketing strategy? An investigation of brand fan pages
Authors: Khan Imran , Dongping Han , Wahab Akhter 
Published: February 2017

Purpose
Along with traditional marketing channels, social media outlets are integrated as a part of the marketing mix. Social media has changed the dynamics of interaction between companies and consumers that foster this relationship. Managing brand fan pages on social networking sites is a specific way the companies are using. Customers can become brand fans on these pages and indicate that they like the brand posts, share on their wall or simply comment. The purpose of this paper is to analyse the impact of cultural differences on the effectiveness of social media metrics and scientifically tested brand engagement in terms of commitment, loyalty and brand recommendations.

Design/methodology/approach
The authors analysed 1,922 brand posts from five different brands of a single product category in three different countries. Ordinary least square and hierarchical moderation regression was used to test the hypotheses.

Findings
Results show that all determinants are not equally suitable for enhancement of number of likes, comments and shares. More specifically, vivid and interactive brand post determinants enhance the number of likes. Furthermore, interactive brand posts enhance the number of comments while vivid brand posts enhance number of shares. Moreover, impact and intensity vary across different cultures.

Originality/value
Brand fan page moderators can obtain guidance from the research in formulating their social media marketing strategies in order to decide which post determinants to place on the fan page.
Measurement of internal user satisfaction and acceptance of the e-justice system in Turkey
Authors: Oktal Ozlem , Alpu Ozlem , Yazici Berna 
Published: February 2017

Purpose
The purpose of this paper is to develop an evaluation model for National Judiciary Informatics System (NJIS), which is an e-justice system forming part of e-government, based on the models and the theories of information systems (ISs).

Design/methodology/approach
The survey was conducted on 8,840 internal users working for judicial services in Turkey. The success of the NJIS as an e-justice system is evaluated using structural equation modeling (SEM).

Findings
The results show that while the most important factor is the latent variable information quality in the SEM created to analyze the satisfaction of internal users using the NJIS, other factors include perceived usefulness (PU), system quality, and service quality, respectively. It is found that design quality has affected directly and positively the perceived ease of use (PEoU) while PEoU has affected the PU in the same manner.

Research limitations/implications
This study was solely concerned with internal users. Therefore, a more comparative study in which other users such as lawyers and ordinary citizens can be incorporated is suggested. Related to internal user satisfaction of the e-justice system, it is explored whether or not internal users are satisfied with their information processing needs, the system’s efficiency, the number of process steps, technical office services, and the system in general.

Originality/value
The research presents a new developed evaluation model of e-justice system from an internal user perspective. Most evaluation models focus on system-centered evaluation or organizational structure while user-centered evaluation concerning judicial ISs has not been explored yet.
Exploring continuance intention of social networking sites
Authors: Bao Zheshi 
Published: February 2017

Purpose
The purpose of this paper is to explore the determinants of continuance intention of social networking site (SNS) users through a new perspective and discuss how to retain SNS users.

Design/methodology/approach
The author proposed a research model by integrating network externalities and social support. Three dimensions of social support and two types of network externalities were analyzed, respectively, to explore the direct and indirect effects on continuance intention. Online questionnaires were adopted to collect data, and 513 valid samples were analyzed by structural equation modeling approach.

Findings
The findings show that network externalities have a significant indirect effect on user’ continuance intention through the mediation effects of social support, and among the three dimensions of social support, network management plays a more important role on continuance intention.

Research limitations/implications
The findings suggest that network externalities can trigger the function of social support to keep the “stickiness” of SNS users, and network management is the key dimension of online social support. Some other theoretical and practical implications are also provided.

Originality/value
The study is novel in exploring users’ continuance intention of SNSs by integrating social support and network externalities. Meanwhile, the author also intends to compare the effect of different dimensions of social support on SNS usage and discuss their internal relationships.
Information technology and marketing performance within international market-entry alliances
Authors: Zhao Shasha , Priporas Constantinos-Vasilios 
Published: February 2017

PurposeThe purpose of this paper is to engage in a comprehensive review of the research on information technology (IT)-mediated international market-entry alliances.Design/methodology/approachThis paper provides a theory-informed conceptual framework of IT-enabled cross-border interfirm relationships and performance outcomes. It integrates perspectives of resource-based view (RBV) and transaction cost economics (TCE) to argue that the establishment of interfirm IT capabilities enhances the marketing performance of the foreign partner in the host location by improving interfirm relationship governance. Furthermore, IT-related risks and contextual restrictions are identified as important moderators.FindingsConceptualisations of IT capabilities, IT-enhanced interfirm governance, and IT-led marketing performance improvement are suggested. Drawing on RBV and TCE, IT resources, related human resources, and IT integration between partner firms in combination enhances the ability of firms to manage the relationship more effectively through shared control, interfirm coordination, cross-firm formalisation, and hybrid centralisation. These benefits then bring about better upstream and downstream marketing performance in the host location. Additionally, IT capabilities help to mitigate possible contextual limitations and risks.Research limitations/implicationsThe paper offers a number of theory- and literature-informed research propositions which can be empirically tested in future studies.Practical implicationsTop managers of firms currently in or planning to enter international alliances for market entry should carefully consider effective development of interfirm IT capabilities in terms of readiness of hardware and software, human resources, and organisational resources.Originality/valueThe paper provides an integrated framework and propositions which contribute to limited understanding and appreciation of IT value in international market-entry alliances.
Push and pull factors in international franchising
Authors: Madanoglu Melih , Alon Ilan , Shoham Amir 
Published: February 2017

PurposeUsing munificence, real options and ambidexterity theories, the purpose of this paper is to demonstrate how the differential between home and host market environmental conditions affects US international franchising expansion.Design/methodology/approachThe authors used firm-level panel data for 151 US-based franchising firms, fromBond’s Guide for Franchise Opportunities, for the years 1994-2008 plus macroeconomic data on the environment, to explain the probability of franchising.FindingsThe paper finds that the differential in economic growth and economic uncertainty impacts franchisors’ desire to expand abroad on a continual basis.Research limitations/implicationsResearchers in international franchising should not only focus on host market environmental variables (pull factors), but also on conditions in the home market (push factors).Originality/valueThe paper adds to environmental explanations of international franchising by focusing on the differential in munificence and uncertainty between home and host countries.
Multi-country collaborative innovation in the internationalisation process
Authors: Chebbi Hela , Yahiaoui Dorra , Thrassou Alkis 
Published: February 2017

PurposeThe purpose of this paper is to operationalise the collaborative cross-border innovation process employed by multinational corporations in their effort to penetrate new markets.Design/methodology/approachThe paper is based on the case study of a leading European telecommunications group (OPERACOM). Methodologically it relies on 32 interviews, observation and secondary data analysis, and is theoretically founded on an extensive (mostly narrative and partly meta-synthetic) literature review.FindingsThe findings show that two new activities merit inclusion in the collaborative cross-border innovation process: strategic marketing anticipation and pre-opportunity studies. In this context, three strategic marketing levers are elucidated: subsidiaries’ knowledge integration, communication/coordination mechanisms, and collaboration-governance; interrelating on the way the activities and elements comprising the breadth and depth of the process’ continuum.Research limitations/implicationsThese stem from and are inherent to the very nature of the research (case study), which proscribes generalisations. Additionally, the research’s long-term span subjects the results to some inevitable potential temporal distortions.Practical implicationsThe research findings, owing to their detailed and activity-specific disposition, constitute a case prototype towards further and/or corresponding application to organisations of this and/or other industries; presenting executives with an existing and market-tested positive paradigm of the innovation aspect of the collaborative market-entry mechanism.Originality/valueCarrying significant scholarly and executive value, the research substantially and specifically enhances the understanding of innovation as an integral part of the internationalisation process, describing and prescribing explicit processes and actions throughout the horizontal and vertical organisational axes.
Portfolio selection with transaction costs and default risk
Authors: Puopolo Giovanni Walter 
Published: February 2017

Purpose
The purpose of this paper is to investigate the effect of default risk and transaction costs on the investor’s asset allocation and the liquidity premium. More precisely, it aims at answering the following question: can default risk generate a first-order effect on the investor’s asset allocation and a liquidity premium of the same order of magnitude as transaction costs?

Design/methodology/approach
The author proposes a very simple consumption-investment model in which an infinitely lived investor allocates her wealth between a risky asset and a riskless security, and incurs in proportional transaction costs when exchanging them. In addition, the risky asset may default at some random time, thus reducing the available wealth of the agent. Two different scenarios of default risk are considered. In the total default scenario, the value of the risky asset drops to zero when default occurs, whereas, in the partial default case, the proceeds from the liquidation of the risky asset amount to 50 percent of its value.

Findings
The paper shows that default risk can generate a first-order effect on the investor’s asset allocation. On the contrary, the liquidity premium is one order of magnitude smaller than the transaction costs, implying that the additional source of risk determined by the possibility of default is not able to generate a first-order effect on asset pricing.

Originality/value
To the author knowledge, this is the first paper that investigates the interaction of default risk and transaction costs on the investor’s asset allocation and its effects on the liquidity premium.
Habitat connectivity and local conditions shape taxonomic and functional diversity of arthropods on green roofs
Authors: Braaker Sonja , Obrist Martin Karl , Ghazoul Jaboury , Moretti Marco 
Published: February 2017

Summary

Increasing development of urban environments creates high pressure on green spaces with potential negative impacts on biodiversity and ecosystem services. There is growing evidence that green roofs – rooftops covered with vegetation – can contribute mitigate the loss of urban green spaces by providing new habitats for numerous arthropod species.

Whether green roofs can contribute to enhance taxonomic and functional diversity and increase connectivity across urbanized areas remains, however, largely unknown. Furthermore, only limited information is available on how environmental conditions shape green roof arthropod communities.

We investigated the community composition of arthropods (Apidae, Curculionidae, Araneae and Carabidae) on 40 green roofs and 40 green sites at ground level in the city of Zurich, Switzerland. We assessed how the site's environmental variables (such as area, height, vegetation, substrate and connectivity among sites) affect species richness and functional diversity using generalized linear models. We used an extension of co‐inertia analysis (RLQ) and fourth‐corner analysis to highlight the mechanism underlying community assemblages across taxonomic groups on green roof and ground communities.

Species richness was higher at ground‐level sites, while no difference in functional diversity was found between green roofs and ground sites. Green roof arthropod diversity increased with higher connectivity and plant species richness, irrespective of substrate depth, height and area of green roofs. The species trait analysis reviewed the mechanisms related to the environmental predictors that shape the species assemblages of the different taxa at ground and roof sites.

Our study shows the important contribution of green roofs in maintaining high functional diversity of arthropod communities across different taxonomic groups, despite their lower species richness compared with ground sites. Species communities on green roofs revealed to be characterized by specific trait assemblages. The study also provides details on the environmental conditions that influence arthropod diversity and gives new perspectives on how the design of green roofs can be improved to increase their ecological value. Furthermore, the study highlights the importance of integrating green roofs in planning policies which aim to enhance urban habitat connectivity.
A review of the predictive role of functional imaging in patients with mucosal primary head and neck cancer treated with radiation therapy
Authors: Min Myo , Lin Peter , Liney Gary , Lee Mark , Forstner Dion , Fowler Allan , Holloway Lois 
Published: February 2017

SummaryAdvanced radiotherapy techniques, such as intensity‐modulated radiotherapy, have been reported to reduce toxicities by improving the dose conformity in mucosal primary head and neck cancer (MPHNC). However, to further optimize the therapeutic ratio, details on individual patient and disease characteristics may be necessary to tailor treatments. This is likely to include identifying poor responders for treatment intensification and good responders for de‐escalation strategies. Non‐invasive, repeatable imaging biomarkers are attractive modalities in both pre‐treatment and intra‐treatment response prediction with a view to individualized treatment options. This review has assessed the current literature on the prognostic/predictive role of widely available functional imaging (FI) studies such as fMRI(functional magnetic resonance imaging), functional computed tomography (fCT) and positron‐emission‐tomography(PET). A literature search was carried out using Medline, Embase and PubMed. Studies were included if imaging was undertaken pre and/or during radiotherapy (with or without the addition of chemotherapy and/or surgery). A total of 99 relevant studies were identified: 14 fMRI, 10 fCT, 59 FDG‐PET and 16 non‐FDG‐PET studies. These articles were reviewed to identify imaging parameters demonstrating a correlation with patient outcome or a factor considered to impact on patient outcome and thus likely to be of potential predictive value in MPHNC and associated future radiotherapy treatment directions. Several studies have demonstrated that both pre‐treatment and mid‐treatment FDG‐PET is predictive of outcomes. However, further studies are required to confirm the role of other imaging studies including fMRI and PET using other tracers. There is large heterogeneity within and between published studies, including tumour sites, treatment options, outcome endpoints and parameters assessed. We propose a minimum set of factors that should be reported and make recommendations for studies evaluating the predictive utility in MPHNC.
A comparison of ultrasound‐guided interscalene and supraclavicular blocks for post‐operative analgesia after shoulder surgery
Authors: Kim B. G. , Han J. U. , Song J. H. , Yang C. , Lee B. W. , Baek J. S. 
Published: February 2017

BackgroundIn contrast to interscalene block, there was little information regarding the analgesic efficacy of supraclavicular block for shoulder surgery. This study aimed to compare the analgesic efficacy and side effects of interscalene and supraclavicular blocks for shoulder surgery.MethodsPatients scheduled for shoulder surgery were assigned to receive either ultrasound‐guided interscalene (n = 25) or supraclavicular block (n = 24) with 20 ml of 0.375% ropivacaine. We assessed the duration of post‐operative analgesia as a primary outcome and pain scores, supplemental analgesia, diaphragmatic excursion, motor block, fingertip numbness, side effects, and patient satisfaction as secondary outcomes.ResultsThe duration of post‐operative analgesia was not statistically different between groups: 868 (800–1440) min for supraclavicular block vs. 800 (731–922) min for interscalene block (median difference −85 min, 95% CI, −283 to 3 min, P = 0.095). The incidence of diaphragmatic paresis was significantly lower in the supraclavicular block group compared with that in the interscalene block group, both at 30 min after the block (66.7% vs. 92%, P = 0.021) and in the post‐anaesthesia care unit (62.5% vs. 92%, P = 0.024). Motor block was higher in the supraclavicular block group in the post‐anaesthesia care unit, however, not at 24 h. Other secondary outcomes were similar for both groups.ConclusionsThis study showed no statistically significant difference in the duration of post‐operative analgesia between the supraclavicular and interscalene blocks. However, the supraclavicular block was associated with a lower incidence of diaphragmatic paresis compared with that of the interscalene block after shoulder surgery.