scholarly journals A spatially extended model to assess the role of landscape structure on the pollination service of Apis mellifera

2020 ◽  
Vol 431 ◽  
pp. 109201 ◽  
Author(s):  
Julien Joseph ◽  
Fernanda Santibáñez ◽  
María Fabiana Laguna ◽  
Guillermo Abramson ◽  
Marcelo N. Kuperman ◽  
...  
Keyword(s):  
Apis Mellifera ◽  
Landscape Structure ◽  
Extended Model ◽  
Pollination Service ◽  
Spatially Extended

Role of personal values and personality traits on intention to recommend a destination

2020 ◽  
Author(s):  
Arnold Japutra ◽  
Sandra Maria Correia Loureiro ◽  
Shasha Wang
Keyword(s):  
Theory Of Planned Behavior ◽  
Personality Traits ◽  
Planned Behavior ◽  
Personal Values ◽  
Favorable Attitude ◽  
Extended Model ◽  
Extended Theory ◽  
Prosocial Values ◽  
Managerial Implications

In this study, the researchers explore the antecedents of tourists’ intention to recommend a destination using an extended Theory of Planned Behavior (TPB). Two personal values (i.e., prosocial and maturity) and two personality traits (i.e., extraversion and agreeableness), which are rarely studied but important elements for marketers to better understand the market (e.g., segment the market), are examined. To test the extended model of TPB, a survey (n=312) was conducted with tourists in Portugal. The researchers find support for the hypothesis that tourists with higher prosocial values, maturity values, and extraversion personality traits are more likely to have a favorable attitude toward a destination and a tendency to recommend the destination. Theoretical and managerial implications are discussed.

scholarly journals Intra-Colonial Viral Infections in Western Honey Bees (Apis mellifera)

2021 ◽  
Vol 9 (5) ◽  
pp. 1087
Author(s):  
Loreley Castelli ◽  
María Laura Genchi García ◽  
Anne Dalmon ◽  
Daniela Arredondo ◽  
Karina Antúnez ◽  
...  
Keyword(s):  
Apis Mellifera ◽  
Honey Bee ◽  
Viral Infections ◽  
Sampling Period ◽  
Virus Genome ◽  
The Individual ◽  
Bee Virus ◽  
Insight Into ◽  
Bee Viruses

RNA viruses play a significant role in the current high losses of pollinators. Although many studies have focused on the epidemiology of western honey bee (Apis mellifera) viruses at the colony level, the dynamics of virus infection within colonies remains poorly explored. In this study, the two main variants of the ubiquitous honey bee virus DWV as well as three major honey bee viruses (SBV, ABPV and BQCV) were analyzed from Varroa-destructor-parasitized pupae. More precisely, RT-qPCR was used to quantify and compare virus genome copies across honey bee pupae at the individual and subfamily levels (i.e., patrilines, sharing the same mother queen but with different drones as fathers). Additionally, virus genome copies were compared in cells parasitized by reproducing and non-reproducing mite foundresses to assess the role of this vector. Only DWV was detected in the samples, and the two variants of this virus significantly differed when comparing the sampling period, colonies and patrilines. Moreover, DWV-A and DWV-B exhibited different infection patterns, reflecting contrasting dynamics. Altogether, these results provide new insight into honey bee diseases and stress the need for more studies about the mechanisms of intra-colonial disease variation in social insects.

A RELATIVISTIC EFFECTIVE MODEL WITH PARAMETERIZED COUPLINGS FOR NEUTRON STARS: THE ROLE OF ANTIKAON CONDENSATES

2011 ◽  
Vol 20 (supp02) ◽  
pp. 133-139
Author(s):  
ALEXANDRE MESQUITA ◽  
MOISÉS RAZEIRA ◽  
DIMITER HADJIMICHEF ◽  
CÉSAR A. Z. VASCONCELLOS ◽  
ROSANA O. GOMES ◽  
...  
Keyword(s):  
Neutron Stars ◽  
Coupling Constants ◽  
Effective Model ◽  
Extended Model ◽  
Many Body ◽  
Parametric Dependence ◽  
Interaction Terms ◽  
Coupling Terms ◽  
Effective Models

We study the effects of antikaon condensates in neutron stars in the framework of a relativistic effective model with derivative couplings which includes genuine many-body forces simulated by nonlinear interaction terms involving scalar-isoscalar (σ, σ*), vector-isoscalar (ω, ɸ), vector-isovector (ϱ), scalar-isovector (δ) mesons. The effective model presented in this work has a philosophy quite similar to the original version of the model with parameterized couplings. But unlike that, in which the parametrization is directly inserted in the coupling constants of the Glendenning model, we present here a method for the derivation of the parametric dependence of the coupling terms, in a way that allows in one side to consistently justify this parametrization and in the other to extend in a coherent way the range of possibilities of parameterizations in effective models with derivative couplings. The extended model is then applied to the description of the mass of neutron stars.

Role of External Factors in Embryogenesis of Apis mellifera

2021 ◽  
Vol 52 (6) ◽  
pp. 422-429
Author(s):  
D. V. Boguslavsky ◽  
I. S. Zakharov
Keyword(s):  
Apis Mellifera ◽  
External Factors

Landscape structure effects on forest plant diversity at local scale: Exploring the role of spatial extent

2015 ◽  
Vol 21 ◽  
pp. 44-52 ◽  
Author(s):  
Valerio Amici ◽  
Duccio Rocchini ◽  
Goffredo Filibeck ◽  
Giovanni Bacaro ◽  
Elisa Santi ◽  
...  
Keyword(s):  
Plant Diversity ◽  
Landscape Structure ◽  
Local Scale ◽  
Spatial Extent

scholarly journals Switching Intent of Disruptive Green Products: The Roles of Comparative Economic Value and Green Trust

2021 ◽  
Vol 9 ◽  
Author(s):  
Chunpei Lin ◽  
Xiumei Lai ◽  
Chuanpeng Yu
Keyword(s):  
Structural Model ◽  
Economic Value ◽  
Disruptive Innovation ◽  
Extended Model ◽  
Green Product ◽  
Continuous Innovation ◽  
Product Switching ◽  
Green Trust ◽  
The Relationship

This study explores consumers’ motivations to switch to new products in the context of disruptive innovation and investigates the role of comparative economic value and green trust. Switching from an existing product to a disruptive green product not only involves benefits but also requires major sacrifices, which are not encountered in the context of continuous innovation. In this study, the relationships between comparative economic value, green trust, self-accountability, and disruptive green product switching intent are examined. Data were collected from China with self-administered questionnaires regarding the disruptive green product. Results of a structural model reveal positive relationships between comparative economic value, green trust, and disruptive green product switching intent. In addition, green trust mediates the effects of the comparative economic value on the disruptive green product switching intent, and self-accountability moderates the relationship between green trust and disruptive green product switching intent. From a practitioner perspective, the research is important because it illuminates the consumer’s motivations regarding product switching in the hitherto unexplored field of automobiles, for which we have shown that our extended model yields meaningful results.

scholarly journals Transcriptional Control of Honey Bee (Apis mellifera) Major Royal Jelly Proteins by 20-Hydroxyecdysone

Insects ◽  
2018 ◽  
Vol 9 (3) ◽  
pp. 122 ◽  
Author(s):  
Paul Winkler ◽  
Frank Sieg ◽  
Anja Buttstedt
Keyword(s):  
Gene Expression ◽  
Apis Mellifera ◽  
Juvenile Hormone ◽  
Honey Bee ◽  
Honey Bees ◽  
Transcriptional Control ◽  
Royal Jelly ◽  
Adult Worker ◽  
Gene Expression Dynamics

One of the first tasks of worker honey bees (Apis mellifera) during their lifetime is to feed the larval offspring. In brief, young workers (nurse bees) secrete a special food jelly that contains a large amount of unique major royal jelly proteins (MRJPs). The regulation of mrjp gene expression is not well understood, but the large upregulation in well-fed nurse bees suggests a tight repression until, or a massive induction upon, hatching of the adult worker bees. The lipoprotein vitellogenin, the synthesis of which is regulated by the two systemic hormones 20-hydroxyecdysone and juvenile hormone, is thought to be a precursor for the production of MRJPs. Thus, the regulation of mrjp expression by the said systemic hormones is likely. This study focusses on the role of 20-hydroxyecdysone by elucidating its effect on mrjp gene expression dynamics. Specifically, we tested whether 20-hydroxyecdysone displayed differential effects on various mrjps. We found that the expression of the mrjps (mrjp1–3) that were finally secreted in large amounts into the food jelly, in particular, were down regulated by 20-hydroxyecdysone treatment, with mrjp3 showing the highest repression value.

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