scholarly journals Individual and social immune mechanisms of the honey bee (Apis mellifera)

2018 ◽  
Vol 74 (1) ◽  
pp. 6013-2018
Author(s):  
ANETA STRACHECKA ◽  
ALEKSANDRA ŁOŚ ◽  
JOANNA FILIPCZUK ◽  
MICHAŁ SCHULZ
Keyword(s):  
Apis Mellifera ◽  
Defense Mechanism ◽  
Resistance Mechanisms ◽  
The Body ◽  
Natural Resistance ◽  
Cell Mediated Immunity ◽  
Individual Level ◽  
Immune Mechanisms ◽  
Rebel Workers ◽  
The Individual

Honey bees (Apis mellifera) are constantly exposed to contact with many types of pathogens. However, during evolution they developed a number of immune mechanisms. At the individual level, they comprise 1) resistance mechanisms associated with anatomical and physiological barriers of the body, 2) cell-mediated immunity involving hemocytes (including plasmocytes, lamellocytes, and granulocytes), 3a) congenital humoral resistance related to the activity of lysozyme (N-acetylmuramylhydrolase), the prophenylooxidase system (ProPO) and hemagglutinins (lectins), and 3b) induced humoral resistence based on the action of antimicrobial peptides: apidicines, hymenoptecin, and defensins. In addition to the individual resistance of each bee, there is also a defense mechanism activated at the colony level. Shared secretion resistance is connected with the presence of antipathogenic compounds in secreta and in bee products. Social immunity is associated with hygienic and nursing behaviors, as well as with age polyethism in the colony, swarming (and the emergence of rebel workers), and the changing behavior of sick individuals. Many aspects and interactions between different types of resistance and immunity still remain unexplored. However, current research trends revolve around clarifying uncertainties so as to strengthen the natural resistance of bees and fight against pathogens that threaten the insects..

Public service motivation and willingness to collaborate

2014 ◽  
Vol 2 (1) ◽  
pp. 80-95 ◽  
Author(s):  
Heather Getha-Taylor ◽  
Alexa Haddock-Bigwarfe
Keyword(s):  
Homeland Security ◽  
Public Service ◽  
Public Service Motivation ◽  
The Body ◽  
Organizational Level ◽  
Cross Sectional ◽  
Content Type ◽  
Individual Level ◽  
Original Survey ◽  
The Individual

Purpose – The purpose of this paper is to examine public service motivation (PSM) and the connection with collaborative attitudes among a sample of homeland security actors representing the public, private, and nonprofit sectors. Design/methodology/approach – This study examines relationships between measures of PSM and collaboration using original survey data and hierarchical multiple regression. Findings – Findings reveal strong positive relationships between PSM measures and attitudes toward collaboration at the individual and organizational level. Research limitations/implications – Survey results are cross-sectional and are from respondents participating in a single state's homeland security summit. Practical implications – It is expected that results can be used to enhance collaboration at the individual and organizational levels. At the organizational level, results can be used for matching individuals with collaborative opportunities. At the individual level, results can be used for enhanced self-reflection and effectiveness purposes. Originality/value – This study provides insights on the relationship between PSM measures and collaborative attitudes. The research contributes to the body of scholarly work connecting PSM and correlates of interest.

Organizational Arrogance and a Theory-Based Instrument

2021 ◽  
pp. 210-232
Author(s):  
C. Victor Herbin III
Keyword(s):  
Organizational Culture ◽  
Work Teams ◽  
The Body ◽  
Organizational Level ◽  
Cronbach Alpha ◽  
Individual Level ◽  
Body Of Knowledge ◽  
The Individual ◽  
Development And Validation

Prior studies provided insight on arrogance at the individual level and how arrogant individuals express superiority through (1) overconfidence in capabilities, (2) dismissiveness, (3) and disparagement, and how these behaviors may negatively impact those employees in and around their work teams, yet did not indicate how these behaviors impact organizational culture. Organizational arrogance represents an emerging concept that describes arrogance at the organizational level. Organizational arrogance provides the body of knowledge with a comprehensive and inclusive definition that led to the development and validation of the Organizational Arrogance Scale with a Cronbach Alpha of .922 that accurately measures the presence of organizational arrogance.

scholarly journals Measuring the body composition of elderly subjects: a comparison of methods

1994 ◽  
Vol 72 (1) ◽  
pp. 33-44 ◽  
Author(s):  
J. J. Reilly ◽  
L. A. Murray ◽  
J. Wilson ◽  
J. V. G. A. Durnin
Keyword(s):  
Body Composition ◽  
Total Body Water ◽  
Body Water ◽  
The Body ◽  
Practical Significance ◽  
Elderly Subjects ◽  
Younger Adults ◽  
Individual Level ◽  
Total Body ◽  
The Individual

There is a paucity of data on differences between methods for the assessment of body composition in elderly subjects. Studies on younger adults suggest that such differences are of some practical significance at the individual level. In the present study the following methods of estimating percentage body fatness (BF%) were compared in healthy elderly men and women (mean age 70 (SD 6) years: densitometry; skinfold thickness; total body water; bioelectrical impedance (BIA) using an age-specific predictive equation and the manufacturers' equation; body mass index (BMI). Though BF% estimates from the various methods tended to be highly correlated with those from densitometry and with each other, differences between methods at the individual level were marked. In particular, the age-specific equations based on BMI and BIA systematically overestimated BF% relative to the other methods. Biases between BF% estimates derived from densitometry, skinfolds, BIA (manufacturers' equation) and total body water were less marked, indicating little evidence of systematic differences between these methods in elderly subjects. Individual differences between methods were slightly greater than those reported in some studies of younger adults, but this may be of little practical significance, and may be considered inevitable in view of variability between and within subjects in the extent to which the underlying assumptions of these two-component methods are met in elderly subjects.

scholarly journals Indoleamine 2,3-Dioxygenase 1 Is a Lung-Specific Innate Immune Defense Mechanism That Inhibits Growth of Francisella tularensis Tryptophan Auxotrophs

2010 ◽  
Vol 78 (6) ◽  
pp. 2723-2733 ◽  
Author(s):  
Kaitian Peng ◽  
Denise M. Monack
Keyword(s):  
Francisella Tularensis ◽  
Defense Mechanisms ◽  
Defense Mechanism ◽  
Immune Defense ◽  
The Body ◽  
Innate Immune ◽  
Microbial Pathogens ◽  
Immune Mechanisms ◽  
Indoleamine 2,3 Dioxygenase ◽  
Organ Specific

ABSTRACT Upon microbial challenge, organs at various anatomic sites of the body employ different innate immune mechanisms to defend against potential infections. Accordingly, microbial pathogens evolved to subvert these organ-specific host immune mechanisms to survive and grow in infected organs. Francisella tularensis is a bacterium capable of infecting multiple organs and thus encounters a myriad of organ-specific defense mechanisms. This suggests that F. tularensis may possess specific factors that aid in evasion of these innate immune defenses. We carried out a microarray-based, negative-selection screen in an intranasal model of Francisella novicida infection to identify Francisella genes that contribute to bacterial growth specifically in the lungs of mice. Genes in the bacterial tryptophan biosynthetic pathway were identified as being important for F. novicida growth specifically in the lungs. In addition, a host tryptophan-catabolizing enzyme, indoleamine 2,3-dioxygenase 1 (IDO1), is induced specifically in the lungs of mice infected with F. novicida or Streptococcus pneumoniae. Furthermore, the attenuation of F. novicida tryptophan mutant bacteria was rescued in the lungs of IDO1−/− mice. IDO1 is a lung-specific innate immune mechanism that controls pulmonary Francisella infections.

scholarly journals Intensive vehicle traffic impacts morphology and endocrine stress response in a threatened amphibian

Oryx ◽  
2015 ◽  
Vol 51 (1) ◽  
pp. 182-188 ◽  
Author(s):  
Hugo Cayuela ◽  
Ludivine Quay ◽  
Adeline Dumet ◽  
Jean-Paul Léna ◽  
Claude Miaud ◽  
...  
Keyword(s):  
Body Size ◽  
Body Condition ◽  
Negative Influence ◽  
The Body ◽  
Amphibian Conservation ◽  
Natural Habitats ◽  
Vehicle Traffic ◽  
Individual Level ◽  
Bombina Variegata ◽  
The Individual

AbstractAmphibians are considered to be the most threatened group of vertebrates. Among the multiple factors involved in their decline, habitat loss and alteration as a result of human activities is a major threat. At the individual level the effects of habitat alteration are potentially multiple, including a range of morphological and physiological responses. Analysing and understanding these responses is therefore a critical challenge for amphibian conservation. We examined the influence of intensive vehicle traffic (motorbikes and trucks on unpaved pathways) on the body size and condition and on the production of glucocorticoids (i.e. corticosterone) in the yellow-bellied toad Bombina variegata. In particular, we tested the hypothesis that intensive vehicle traffic has a negative influence on body size and body condition, and postulated that it also increases corticosterone production. Using morphometric data and saliva samples collected from four populations in France, we found that intensive vehicle traffic is associated with a decrease in body size and body condition in both males and females. Furthermore, our analysis revealed that corticosterone production was lower in both sexes in populations experiencing intensive vehicle traffic. We suggest that measures should be applied to reduce vehicle traffic intensity on unpaved pathways during toad breeding activity. This is critical for B. variegata, for which man-made ruts and residual puddles could mitigate the loss of natural habitats.

A review of noteworthy/major innovations in wearable clothing for thermal and moisture management from material to fabric structure

2021 ◽  
pp. 004051752110277
Author(s):  
Hafiz Muhammad Kaleem Ullah ◽  
Joseph Lejeune ◽  
Aurélie Cayla ◽  
Mélanie Monceaux ◽  
Christine Campagne ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
The Body ◽  
Innovative Strategies ◽  
Individual Level ◽  
Thermal Range ◽  
Moisture Management ◽  
Wide Range ◽  
The Individual ◽  
Air Conditioning Systems ◽  
Body Heat

The human body exchanges heat through the environment by various means, such as radiation, evaporation, conduction, and convection. Thermo-physiological comfort is associated with the effective heat transfer between the body and the atmosphere, maintaining the body temperature in a tolerable thermal range (36.5–37.5ºC). In order to ensure comfort, the body heat must be preserved or emitted, depending on external conditions. If the body heat is not properly managed, it can cause hyperthermia, heatstroke, and thermal discomfort. Conventionally, heating, ventilation, and air conditioning systems are used to provide comfort. However, they require a huge amount of energy, leading to an increase in global warming, and are limited to indoor applications. In recent decades, scientists across the world have been working to provide thermal comfort through wearable innovative textiles. This review article presents recent innovative strategies for moisture and/or thermal management at the material, filament/fiber, yarn, and fabric scales. It also summarizes the passive/active textile models for comfort. Integrating electrical devices in garments can rapidly control the skin temperature, and is dynamic and useful for a wide range of environmental conditions. However, their use can be limited in some situations due to their bulky design and batteries, which must be frequently recharged. Furthermore, adaptive textiles enable the wearer to maintain comfort in various temperatures and humidity without requiring batteries. Using these wearable textiles is convenient to provide thermal comfort at the individual level rather than controlling the entire building temperature.

Singapore's Changing Demography, the Eldercare Predicament and Transnational ‘Care’ Migration

2014 ◽  
Vol 2 (2) ◽  
pp. 247-269 ◽  
Author(s):  
Brenda S.A. Yeoh ◽  
Shirlena Huang
Keyword(s):  
Social Reproduction ◽  
Transnational Migration ◽  
Division Of Labour ◽  
The Body ◽  
Individual Level ◽  
Care Chain ◽  
Transnational Family ◽  
The Individual ◽  
City State ◽  
The City

AbstractScholars have recently argued that globalisation processes have significantly altered not just the productive but reproductive sphere. ‘Reproduction’ is formulated to include both biological and social reproduction, and which at the individual level requires ‘care’ throughout the life-cycle – that is, from cradle to grave – in sustaining the body in its corporeal and affective aspects. Concepts that have emerged in the literature in recent decades such as the ‘transnational family’, ‘global householding’ and ‘global care chain’ draw attention to the observation that the formation and sustenance of households is increasingly reliant on the international movement of people and transactions among household members residing in more than one national territory. Applying these notions to the context of the city-state of Singapore where the predicament around eldercare (resulting essentially from rapid fertility decline, shortages of Singapore women's reproductive labour and rigidities in the gender household division of labour) accompanies rapid globalisation, this paper examines strategies of care substitution which draw on the lowly paid labour of two groups of transnational subjects (mainly women) – transnational domestic workers working in the privatised sphere of the home, and transnational healthcare workers in institutionalised settings. The paper reflects upon the interdependencies between flows of transnational care migration and delves into the gender and class implications of these flows for an understanding of the links between transnational migration and social change.

scholarly journals Sub-Lethal Doses of Clothianidin Inhibit the Conditioning and Biosensory Abilities of the Western Honeybee Apis mellifera

Insects ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 340 ◽  
Author(s):  
Bartling ◽  
Vilcinskas ◽  
Lee
Keyword(s):  
Apis Mellifera ◽  
Individual Level ◽  
Sufficient Detail ◽  
Significant Movement ◽  
Neonicotinoid Insecticide ◽  
The Stability ◽  
The Individual ◽  
Chemical Pesticides ◽  
Lethal Doses

Insects play an important role in the stability of ecosystems by fulfilling key functions such as pollination and nutrient cycling, as well as acting as prey for amphibians, reptiles, birds and mammals. The global decline of insects is therefore a cause for concern, and the role of chemical pesticides must be examined carefully. The lethal effects of insecticides are well understood, but sub-lethal concentrations have not been studied in sufficient detail. We therefore used the western honeybee Apis mellifera as a model to test the effect of the neonicotinoid insecticide clothianidin on the movement, biosensory abilities and odor-dependent conditioning of insects, titrating from lethal to sub-lethal doses. Bees treated with sub-lethal doses showed no significant movement impairment compared to untreated control bees, but their ability to react to an aversive stimulus was inhibited. These results show that clothianidin is not only highly toxic to honeybees, but can, at lower doses, also disrupt the biosensory capabilities of survivors, probably reducing fitness at the individual level. In our study, sub-lethal doses of clothianidin altered the biosensory abilities of the honeybee; possible consequences at the colony level are discussed.

scholarly journals Colony adaptive response to simulated heat waves and consequences at the individual level in honeybees (Apis mellifera)

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Célia Bordier ◽  
Hélène Dechatre ◽  
Séverine Suchail ◽  
Mathilde Peruzzi ◽  
Samuel Soubeyrand ◽  
...  
Keyword(s):  
Apis Mellifera ◽  
Adaptive Response ◽  
Heat Waves ◽  
Individual Level ◽  
The Individual

scholarly journals Resistance rather than tolerance explains survival of savannah honeybees (Apis mellifera scutellata) to infestation by the parasitic mite Varroa destructor

Parasitology ◽  
2015 ◽  
Vol 143 (3) ◽  
pp. 374-387 ◽  
Author(s):  
URSULA STRAUSS ◽  
VINCENT DIETEMANN ◽  
HANNELIE HUMAN ◽  
ROBIN M. CREWE ◽  
CHRISTIAN W. W. PIRK
Keyword(s):  
Apis Mellifera ◽  
Varroa Destructor ◽  
Resistance Mechanisms ◽  
Mite Infestation ◽  
Apis Mellifera Scutellata ◽  
Individual Host ◽  
Breeding Programmes ◽  
Parasitic Mite ◽  
Susceptible Populations ◽  
The Individual

SUMMARYVarroa destructor is considered the most damaging parasite affecting honeybees (Apis mellifera L.). However, some honeybee populations such as the savannah honeybee (Apis mellifera scutellata) can survive mite infestation without treatment. It is unclear if survival is due to resistance mechanisms decreasing parasite reproduction or to tolerance mechanisms decreasing the detrimental effects of mites on the host. This study investigates both aspects by quantifying the reproductive output of V. destructor and its physiological costs at the individual host level. Costs measured were not consistently lower when compared with susceptible honeybee populations, indicating a lack of tolerance. In contrast, reproduction of V. destructor mites was distinctly lower than in susceptible populations. There was higher proportion of infertile individuals and the reproductive success of fertile mites was lower than measured to date, even in surviving populations. Our results suggest that survival of savannah honeybees is based on resistance rather than tolerance to this parasite. We identified traits that may be useful for breeding programmes aimed at increasing the survival of susceptible populations. African honeybees may have benefited from a lack of human interference, allowing natural selection to shape a population of honeybees that is more resistant to Varroa mite infestation.

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