bluuebunny/crossref_metadata_2025_split huggingface dataset:
Diversification dynamics of hypermetamorphic blister beetles (Meloidae): Are homoplastic host shifts and phoresy key factors of a rushing forward strategy to escape extinction?
Authors: López-Estrada E.K. , Sanmartín I. , Uribe J.E. , Abalde S. , García-París M. 
Published: January 2021

ABSTRACTChanges in life history traits, including reproductive strategies or host shifts, are often considered triggers of speciation, affecting diversification rates. Subsequently, these shifts can have dramatic effects on the evolutionary history of a lineage. In this study, we examine the consequences of changes in life history traits, in particular host-type and phoresy, within the hypermetamorphic clade of blister beetles (Meloidae). This clade exhibits a complex life cycle involving multiple metamorphoses and parasitoidism. Most tribes within the clade are bee-parasitoids, phoretic or non-phoretic, while two tribes feed on grasshopper eggs. Species richness differs greatly between bee and grasshopper specialist clades, and between phoretic and non-phoretic genera. We generated a mitogenomic phylogeny of the hypermetamorphic clade of Meloidae, including 21 newly generated complete mitogenomes. The phylogeny and estimated lineage divergence times were used to explore the association between diversification rates and changes in host specificity and phoresy, using State-Dependent Speciation and Extinction (SSE) models, while accounting for hidden factors and phylogenetic uncertainty within a Bayesian framework. The ancestor of the hypermetamorphic Meloidae was a non-phoretic bee-parasitoid, and independent transitions towards phoretic bee-parasitoidism or grasshopper specialization occurred multiple times. Bee-parasitoid lineages that are non-phoretic have significantly higher relative extinction rates and lower diversification rates than grasshopper specialists or phoretic bee-parasitoids, while no significant differences were found between the latter two strategies. This suggests that these two life strategies contributed independently to the evolutionary success of Nemognathinae and Meloinae, allowing them to escape from the evolutionary constraints imposed by their hypermetamorphic life-cycle, and that the “bee-by-crawling” strategy may be an evolutionary “dead end”. We show how SSE models can be used not only for testing diversification dependence in relation to the focal character but to identify hidden traits contributing to the diversification dynamics. The ability of blister beetles to explore new evolutionary scenarios including the development of homoplastic life strategies, are extraordinary outcomes along the evolution of a single lineage: the hypermetamorphic Meloidae.
The spindle assembly checkpoint and the spatial activation of Polo kinase determine the duration of cell division and prevent neural stem cells tumor formation
Authors: Gallaud Emmanuel , Richard-Parpaillon Laurent , Pascal Aude , Métivier Mathieu , Archambault Vincent , Giet Régis 
Published: January 2021

AbstractThe maintenance of a restricted pool of asymmetrically dividing stem cells is essential for tissue homeostasis. This process requires the control of mitotic progression that ensures the accurate chromosome segregation. In addition, this event is coupled to the asymmetric distribution of cell fate determinants in order to prevent stem cell amplification. How this coupling is regulated remains poorly described. Here, using asymmetrically dividingDrosophilaneural stem cells (NSCs), we show that Polo kinase activity levels determine the length of cell division, independent of the spindle assembly checkpoint (SAC). This event is mediated by the direct phosphorylation of Polo kinase by Aurora A at spindle poles and Aurora B kinases at centromeres. Furthermore, we show that Aurora A-dependent activation of Polo is the major event that promotes NSC polarization and together with the SAC prevents brain tumor growth. Altogether, our results show that an Aurora/Polo kinase module couples NSC mitotic progression and polarization for tissue homeostasis.
Nonlinear collision between anisotropic propagating waves in mouse somatosensory cortex
Authors: Di Volo M. , Férézou I. 
Published: January 2021

AbstractHow does cellular organization shape the spatio-temporal patterns of activity in the cortex while processing sensory information? After measuring the propagation of activity in the mouse primary somatosensory cortex (S1) in response to single whisker deflections with Voltage Sensitive Dye (VSD) imaging, we developed a two dimensional mean field model of S1. We observed that, for strong enough excitatory cortical interactions, whisker deflections generate a propagating wave in S1. We developed an inversion method that reconstructs model parameters from VSD data, revealing that a spatially heterogeneous organization of synaptic strengths between pyramidal neurons in S1 is likely to be responsible for the anisotropic spatio-temporal patterns of activity measured experimentally. Finally, we report that two consecutive stimuli activating different spatial locations in S1 generate two waves which collide sub-linearly. In the model, such sub-linear interaction is explained by a lower sensitivity to external perturbations of neural networks during activated states.
HGHA: task allocation and path planning for warehouse agents
Authors: Liu Yandong , Han Dong , Wang Lujia , Xu Cheng-Zhong 
Published: January 2021

Purpose
With the rapid development of e-commerce, logistics demand is increasing day by day. The modern warehousing with a multi-agent system as the core comes into being. This paper aims to study the task allocation and path-planning (TAPP) problem as required by the multi-agent warehouse system.

Design/methodology/approach
The TAPP problem targets to minimize the makespan by allocating tasks to the agents and planning collision-free paths for the agents. This paper presents the Hierarchical Genetic Highways Algorithm (HGHA), a hierarchical algorithm combining optimization and multi-agent path-finding (MAPF). The top-level is the genetic algorithm (GA), allocating tasks to agents in an optimized way. The lower level is the so-called highways local repair (HLR) process, avoiding the collisions by local repairment if and only if conflicts arise.

Findings
Experiments demonstrate that HGHA performs faster and more efficient for the warehouse scenario than max multi-flow. This paper also applies HGHA to TAPP instances with a hundred agents and a thousand storage locations in a customized warehouse simulation platform with MultiBots.

Originality/value
This paper formulates the multi-agent warehousing distribution problem, TAPP. The HGHA based on hierarchical architecture solves the TAPP accurately and quickly. Verifying the HGHA by the large-scale multi-agent simulation platform MultiBots.
A capsule-based collision detection approach of irregular objects in virtual maintenance
Authors: Jin Yuxue , Geng Jie , He Zhiyi , Lv Chuan , Zhao Tingdi 
Published: January 2021

Purpose
Virtual maintenance simulation is of great importance to help designers find and avoid design problems. During its simulation phase, besides the high precision requirement, collision detection must be suitable for all irregular objects in a virtual maintenance environment. Therefore, in this paper, a collision detection approach is proposed based on encapsulation for irregular objects in the virtual maintenance environment.

Design/methodology/approach
First, virtual maintenance simulation characteristics and several commonly used bounding boxes methods are analyzed, which motivates the application of encapsulation theory. Based on these, three different encapsulation methods are oriented to the needs of simulation, including encapsulation of rigid maintenance objects, flexible maintenance objects and maintenance personnel. In addition, to detecting collisions accurately, this paper divides the detection process into two stages. That is, in the first stage, a rough detection is carried out and then a tiny slice space is constructed to generate corresponding capsule groups, which will be redetected in the secondary stage. At last, several case studies are applied to illustrate the performance of the methodology.

Findings
The automatic construction algorithm for bounding boxes can be adapted to all forms of objects. The number of detection primitives are greatly reduced. It introduces the reachable space of the human body in maintainability as the collision search area.

Originality/value
The advantages of virtual maintenance simulation could also be advantageous in the industry with further studies. The paper believes this study is of particular interest to the readers of your journal.
Financial market efficiency: global and regional financial market perspective
Authors: Abaidoo Rexford 
Published: January 2021

PurposeThis study examines dynamics of global and regional financial market efficiency; and how specific features of the market and other conditions influence variability in such efficiency.Design/methodology/approachThe study employs fixed effects statistical approach in its examination of how specific features of financial markets influence variability in its efficiency.FindingsThis study finds that individual IMF defined economic regions tend to exhibits significantly different financial market efficiency characteristics given specific market features and conditions. In regional level comparative analysis (e.g. Europe, Africa, Asia–Pacific etc.) this study finds that incidence of financial market uncertainty is the dominant condition with significant effect on financial market efficiency across all the IMF regions. In the global level analysis, empirical estimates presented suggest that financial market uncertainty, financial institutional depth and financial institutional efficiency tend to have significant positive influence on global financial market efficiency all things being equal. In the same analysis however, this study finds that financial market and financial institutional access growth has significant negative impact on financial market efficiency.Originality/valueThe uniqueness of this study compared to related ones found in the literature stems from its focus on financial market efficiency at the global, and IMF defined regional block level instead of on a specific economy as often found in the literature. Additionally, in contrast to other related studies, this study further examines the role of global financial market uncertainty in its financial market efficiency analysis. Financial market uncertainty variable may be unique to this study because the variable is derived through an econometric process from a base variable.
Government spending and economic growth: a trivariate causality testing
Authors: Olaoye Olumide , Afolabi Olatunji 
Published: January 2021

PurposeThis paper investigates whether institutional environment influences the relationship government spending and economic growth in ECOWAS over the period 2008–2017.Design/methodology/approachThe study adopts the recently developed panel vector autoregressive (PVAR) by Abrigo and Love (2015) and a two-step system generalised method of moment (GMM).FindingsThe results from the study show no evidence of either unidirectional or bidirectional causal relationship between government spending and economic growth in ECOWAS. Our findings reveal that government spending when associated with high level of corruption, oversized government and a waste of public resources will not cause economic growth.Originality/valueUnlike previous studies, we resolve the inherent problems of endogeneity and persistence in economic data. Likewise, we depart from existing studies that examined the causal relationship in a bivariate framework and adopt a trivariate causality testing.
The effectiveness of effectuation: a meta-analysis on contextual factors
Authors: Chen Jiawen , Liu Linlin , Chen Qingxin 
Published: January 2021

PurposeEmpirical data on the impacts of entrepreneurial effectuation on firm performance are scattered and controversial. This study conducts a meta-analysis to obtain evidence on whether and under what conditions effectuation is valuable. A contextual framework is proposed that highlights the boundary condition of the performance impact of effectuation.Design/methodology/approachBoth the traditional approach of meta-analysis and advanced techniques of Bayesian meta-analytic tests are used to combine numerous studies from varied research contexts.FindingsMeta-analytic results show that effectuation generally has a positive impact on firm performance, and is context-dependent, leading to stronger performance for older firms and firms in high-tech industries and emerging countries.Originality/valueThe findings provide important implications for entrepreneurs who are considering applying effectuation. This study highlights that effectuation is context-dependent and the performance implications of effectuation are contingent on contextual factors at organizational, industrial and institutional levels. This study extends the contextual understanding of the effectuation–performance relationship.
Enriching management learning with differentiated instruction
Authors: Alstete Jeffrey W. , Meyer John P. , Beutell Nicholas J. 
Published: January 2021

PurposeThe purpose of this study is to utilize an exploratory multiple-case design research method using three undergraduate management courses at a medium-sized private comprehensive college near a large metropolitan area in the USA.Design/methodology/approachThis paper explores differentiated instruction in relation to experiential learning in management education by examining three teaching applications from different management courses to illustrate these concepts.FindingsThe use of differentiated instruction in management education is supported through varied approaches such as individual student and team-based scaffolding that demonstrate the applicability of differentiation. In addition to improving student learning, other benefits include improved student retention and faculty autonomy in course creation and delivery. The implementation involves a proactive response to learner needs informed by a faculty perspective that recognizes student diversity yet retains quality assurance standards with mindful assessment and planning.Research limitations/implicationsThe comparatively small number of courses and instructional methods may make the specific findings and examples more relevant to the type of institution examined. Yet, the general conclusions and methods identified have potential implications for learners in a wide variety of colleges and universities.Practical implicationsDifferentiated instruction may be a useful approach for enhancing learning in heterogenous groups of students by recognizing student readiness and making appropriate modifications.Originality/valueThis paper offers an exploratory overview of differentiated instruction with guidance for management faculty members in designing and implementing these approaches in their courses.
Adverse obstetric outcomes in two Brazilian maternity hospitals
Authors: Andrade Alessa Leila , Gama Zenewton André da Silva , Freitas Marise Reis de , Medeiros Wilton Rodrigues , Sousa Kelienny de Meneses , Silva Edna Marta Mendes da , Rosendo Tatyana Souza 
Published: January 2021

PurposeObstetric adverse outcomes (AOs) are an important topic and the use of composite measures may favor the understanding of their impact on patient safety. The aim of the present study was to estimate AO frequency and obstetric care quality in low and high-risk maternity hospitals.Design/methodology/approachA one-year longitudinal follow-up study in two public Brazilian maternity hospitals. The frequency of AOs was measured in 2,880 randomly selected subjects, 1,440 in each institution, consisting of women and their newborn babies. The frequency of 14 AOs was estimated every two weeks for one year, as well as three obstetric care quality indices based on their frequency and severity as follows: the Adverse Outcome Index (AOI), the Weighted Adverse Outcome Score and the Severity Index.FindingsA significant number of mothers and newborns exhibited AOs. The most prevalent maternal AOs were admission to the ICU and postpartum hysterectomy. Regarding newborns, hospitalization for > seven days and neonatal infection were the most common complications. Adverse outcomes were more frequent at the high-risk maternity, however, they were more severe at the low-risk facility. The AOI was stable at the high-risk center but declined after interventions during the follow-up year.Originality/valueHigh AO frequency was identified in both mothers and newborns. The results demonstrate the need for public patient safety policies for low-risk maternity hospitals, where AOs were less frequent but more severe.
Students as change agents for campus sustainability in Malaysian universities
Authors: Mohamad Zeeda Fatimah , Mamat Mohd Zufri , Muhamad Noor Muhamad Faisal 
Published: January 2021

Purpose
The notion of students as change agents have widely been used in the campus sustainability literature, but very little has been done to unpack what it really means in practice. This paper aims to critically investigate university students’ perspectives on their role as a change agent for campus sustainability in the context of Malaysian universities.

Design/methodology/approach
In-depth interviews were carried out with 21 students that have been categorized as change agents through selection criteria at three leading universities in the area of campus sustainability in Malaysia. The data collected from the interviews were analysed through content-based and thematic analysis.

Findings
Findings demonstrate that students are the backbone behind the implementation of campus sustainability activities. They play the multi-faceted role of leaders, supporters and ambassadors in initiating and driving campus sustainability. The results further suggest that support and freedom to act are the empowering factors that have driven these change agents in carrying out their initiatives. However, without a position, the students’ voices are not significant.

Originality/value
This study provides deeper evidence-based insights on the notion of students as change agents and how it can be operationalized in the context of campus sustainability.
Clarifying the interface between respectful leadership and intention to stay
Authors: Enwereuzor Ibeawuchi K. , Ugwu Lawrence E. 
Published: January 2021

PurposeConsidering that leaders play an important role in influencing the work environment and experiences of subordinates as well as the fact that employees like to be respected, the purpose of the current study was to explore supportive supervisor relations as a mediator of the relationship between respectful leadership and intention to stay.Design/methodology/approachData were collected from 389 hospital nurses based on authors' personal networks at three measurement points. This was done to avoid problems associated with collecting data for predictor and criterion variables from the same source at the same time. The direct and indirect effects were tested with ordinary least squares regression-based path analysis.FindingsRespectful leadership was found to be positively related to both supportive supervisor relations and intention to stay. In addition, supportive supervisor relations had a positive relationship with intention to stay. Finally, the relationship between respectful leadership and intention to stay was mediated by supportive supervisor relations.Research limitations/implicationsThe sample were drawn from nurses only in a particularly region of a country and differences may exist among other occupational groups and geographical areas of the country in the way they perceive their leaders' behavior.Practical implicationsManagement of health facilities can utilize information from annual reviews and feedback from subordinates as performance evaluation criteria for rewarding leaders who treat their subordinates respectfully. However, leaders who are disrespectful toward their subordinates could be identified and subjected to mandatory training on respectful leadership.Originality/valueThe current study extends the present state of research on the impact exerted by respectful leadership in an organizational context never examined heretofore; that is, health care context. This is also the first study linking respectful leadership, supportive supervisor relations and intention to stay in unison in a single study.
Attitudes toward femvertising in the Middle East: the case of Lebanon
Authors: Elhajjar Samer 
Published: January 2021

Purpose
The purpose of this paper is to offer a clear understanding of the use of femvertising in Lebanon and its effects on consumers in general.

Design/methodology/approach
Data was collected using an online survey questionnaire, administered to a random sample of 318 individuals. Structural equation modeling (SEM) was used to test the hypotheses.

Findings
Lebanese people positively perceive the implication of women empowerment in advertisement. Gender, trust in ads, support of women’s rights and feminist self-identification, all have an impact on consumer behavior toward femvertising. However, the educational level and age do not affect the attitudes toward femvertising.

Practical implications
The practical contributions of our research derive from the importance of our findings on the uniqueness of the knowledge and information in the Middle East region. The importance of increasing knowledge of gender roles and Marketing in the Middle East is highly related to the gender dynamics embedded within broader globalization debates.

Originality/value
While studies have been extensive on the utilization of femvertising as a marketing strategy, the contexts under which these studies have been published, are mainly focused in the West. Hence, the Middle East in general and Lebanon, in particular, has witnessed no comprehensive and serious research on the subject. Consequently, this study is considered important and a major step toward establishing a theoretical base and underpinnings on the subject of utilization of femvertising in brands’ marketing strategies.
Ambidexterity in Agile software development: a conceptual paper
Authors: Lindskog Carin , Magnusson Monika 
Published: January 2021

PurposeThe purpose of this study is to apply the concept of organizational ambidexterity as a conceptual lens to increase the understanding of tensions between exploitation (continuity) and exploration (change) in Agile software development (ASD) project teams, and particularly the balancing (ambidextrous) strategies utilized.Design/methodology/approachA conceptual framework was constructed from interdisciplinary sources on ambidexterity. A literature review of publications on ambidexterity in ASD was then performed, and the results from the selected publications were classified according to an extension of the conceptual framework.FindingsContextual ambidexterity in ASD is affected by the four basic coherent concepts: time, task, team and transition. The study found that most ambidextrous factors and strategies were task and team-related. In addition, a mixture of hard (performance) strategies and soft (social) strategies is needed in order for people/teams to (be able to) become ambidextrous.Practical implicationsTo provide a better understanding of ASD, it is important to identify a broader set of ambidextrous factors and strategies that can impact ASD project teams. The expanded conceptual framework can serve as a basis for future empirical research and provide insights to practitioners on how to strengthen ambidexterity in ASD projects.Originality/valueThe contribution is of great importance for ASD research and practice, as ASD methods are a popular method for managing projects within ASD and in other nonsoftware organizations. In addition, as more and more organizations struggle to deal with rapidly changing environments, interest in the phenomena of paradoxical tensions and the strategy (ambidexterity) to deal with these tensions increase.