scholarly journals Ecología y evolución de la polinización por engaño

2017 ◽  
pp. 57
Author(s):  
Reyna A. Castillo ◽  
Carlos Cordero ◽  
César A. Domínguez
Keyword(s):  
Theoretical Framework ◽  
Evolutionary Perspective ◽  
Frequency Dependent ◽  
Selective Pressures ◽  
Deceit Pollination ◽  
Different Types ◽  
Main Components

In this work we reviewed the biology of deceit pollination from an ecological and evolutionary perspective. Species pollinated by deceit are characterized because a percentage of their flowers do not produce rewards, and therefore these species get the advantages derived from pollinators without paying the costs. In this review, we first described the different types of deceit occurring in nature, as well as the selective pressures involved on its evolution. We then reviewed and discussed the theoretical framework of deceit pollination and the relevant aspects of its main components: frequency-dependent se lection, flower resemblance, and the sensorial capacities of pollinators.

scholarly journals Ancient RNA virus epidemics through the lens of recent adaptation in human genomes

2020 ◽  
Vol 375 (1812) ◽  
pp. 20190575 ◽  
Author(s):  
David Enard ◽  
Dmitri A. Petrov
Keyword(s):  
Rna Virus ◽  
Human Populations ◽  
Evolutionary Perspective ◽  
Arms Races ◽  
Selective Pressures ◽  
The Past ◽  
1000 Genomes ◽  
Human Genomes ◽  
Different Types ◽  
Health And Disease

Over the course of the last several million years of evolution, humans probably have been plagued by hundreds or perhaps thousands of epidemics. Little is known about such ancient epidemics and a deep evolutionary perspective on current pathogenic threats is lacking. The study of past epidemics has typically been limited in temporal scope to recorded history, and in physical scope to pathogens that left sufficient DNA behind, such as Yersinia pestis during the Great Plague. Host genomes, however, offer an indirect way to detect ancient epidemics beyond the current temporal and physical limits. Arms races with pathogens have shaped the genomes of the hosts by driving a large number of adaptations at many genes, and these signals can be used to detect and further characterize ancient epidemics. Here, we detect the genomic footprints left by ancient viral epidemics that took place in the past approximately 50 000 years in the 26 human populations represented in the 1000 Genomes Project. By using the enrichment in signals of adaptation at approximately 4500 host loci that interact with specific types of viruses, we provide evidence that RNA viruses have driven a particularly large number of adaptive events across diverse human populations. These results suggest that different types of viruses may have exerted different selective pressures during human evolution. Knowledge of these past selective pressures will provide a deeper evolutionary perspective on current pathogenic threats. This article is part of the theme issue ‘Insights into health and disease from ancient biomolecules’.

scholarly journals Ancient RNA virus epidemics through the lens of recent adaptation in human genomes

2020 ◽  
Author(s):  
David Enard ◽  
Dmitri A. Petrov
Keyword(s):  
Human Evolution ◽  
Rna Viruses ◽  
Rna Virus ◽  
Human Populations ◽  
Evolutionary Perspective ◽  
Arms Races ◽  
Selective Pressures ◽  
The Past ◽  
Human Genomes ◽  
Different Types

AbstractOver the course of the last several million years of evolution, humans likely have been plagued by hundreds or perhaps thousands of epidemics. Little is known about such ancient epidemics and a deep evolutionary perspective on current pathogenic threats is lacking. The study of past epidemics has typically been limited in temporal scope to recorded history, and in physical scope to pathogens that left sufficient DNA behind, such as Yersinia pestis during the Great Plague.Host genomes however offer an indirect way to detect ancient epidemics beyond the current temporal and physical limits. Arms races with pathogens have shaped the genomes of the hosts by driving a large number of adaptations at many genes, and these signals can be used to detect and further characterize ancient epidemics.Here, we detect the genomic footprints left by ancient viral epidemics that took place in the past ~50,000 years in the 26 human populations represented in the 1,000 Genomes Project. By using the enrichment in signals of adaptation at ~4,500 host loci that interact with specific types of viruses, we provide evidence that RNA viruses have driven a particularly large number of adaptive events across diverse human populations. These results suggest that different types of viruses may have exerted different selective pressures during human evolution. Knowledge of these past selective pressures will provide a deeper evolutionary perspective on current pathogenic threats.

Antecedents of parental psychological control: A narrative review grounded in Self-Determination Theory perspective

2020 ◽  
pp. 29-54
Author(s):  
Sebastiano Costa ◽  
Francesca Liga ◽  
Maria Cristina Gugliandolo ◽  
Simona Sireno ◽  
Rosalba Larcan ◽  
...  
Keyword(s):  
Life Cycle ◽  
Social Environment ◽  
Psychological Control ◽  
Self Determination Theory ◽  
Theoretical Framework ◽  
Self Determination ◽  
Parental Psychological Control ◽  
Parental Characteristics ◽  
Different Types ◽  
Control Construct

Self-determination theory has become a consolidated theoretical framework to deepen the psychological control construct. Numerous studies have widely investigated the consequences of the use of this parenting strategy during the life cycle. Although studies focused on the antecedents of parental psychological control are not so numerous, they provide an interesting picture that needs to be systematized and organized. For this reason, this narra-tive review was aimed at describing the studies on the antecedents of psychological control that used SDT as a theoretical framework. These studies were structured according to three categories: Parental Characteristics (or pressure from within), Child Characteristics (pres-sure from below), and Family Social Environment Characteristics (pressure from above). The results highlighted a wealth of studies in each category and indicating the need to con-tinue this line of studies in the future through the integration of the different types of ante-cedents too.

Theoretical framework

2017 ◽  
Author(s):  
Judith Huber
Keyword(s):  
Theoretical Framework ◽  
Construction Grammar ◽  
Motion Verbs ◽  
Motion Event ◽  
Different Types ◽  
Constructionist Approach ◽  
Manner Verbs

Chapter 2 provides an introduction to the motion encoding typology as proposed by Talmy, Slobin, and others (manner- and path-conflating languages, different types of framing and their concomitant characteristics). It argues that this typology is highly compatible with a construction grammar framework, points out the differences, and shows that particularly from the diachronic perspective taken in this study, the constructionist approach has advantages over the originally lexicalist approach of the motion typology. The chapter also provides a discussion of the different categories of motion verbs used in this study (manner verbs, path verbs, neutral motion verbs, and verbs that do not evoke a motion event on their own, but can receive a contextual motion reading).

Comparison of diffused layer prepared using liquid dopant solutions and pastes for solar cell with screen printed electrodes

2016 ◽  
Vol 33 (3) ◽  
pp. 167-171 ◽  
Author(s):  
Kazimierz Drabczyk ◽  
Edyta Wróbel ◽  
Grazyna Kulesza-Matlak ◽  
Wojciech Filipowski ◽  
Krzysztof Waczynski ◽  
...  
Keyword(s):  
Solar Cells ◽  
Ethyl Alcohol ◽  
Diffusion Processes ◽  
Phosphorus Oxychloride ◽  
Low Cost ◽  
Content Type ◽  
Base Solution ◽  
Different Types ◽  
Main Components ◽  
Two Stages

Purpose The purpose of this study is comparison of the diffusion processes performed using the commercial available dopant paste made by Filmtronics and the original prepared liquid dopant solution. To decrease prices of industrially produced silicon-based solar cells, the new low-cost production processes are necessary. The main components of most popular silicon solar cells are with diffused emitter layer, passivation, anti-reflective layers and metal electrodes. This type of cells is prepared usually using phosphorus oxychloride diffusion source and metal pastes for screen printing. The diffusion process in diffusion furnace with quartz tube is slow, complicated and requires expensive equipment. The alternative for this technology is very fast in-line processing using the belt furnaces as an equipment. This approach requires different dopant sources. Design/methodology/approach In this work, the diffusion processes were made for two different types of dopant sources. The first one was the commercial available dopant paste from Filmtronics and the second one was the original prepared liquid dopant solution. The investigation was focused on dopant sources fabrication and diffusion processes. The doping solution was made in two stages. In the first stage, a base solution (without dopants) was made: dropwise deionized (DI) water and ethyl alcohol were added to a solution consisting of tetraethoxysilane (TEOS) and 99.8 per cent ethyl alcohol. Next, to the base solution, orthophosphoric acid dissolved in ethyl alcohol was added. Findings Diffused emitter layers with sheet resistance around 60 Ω/sq were produced on solar grade monocrystalline silicon wafers using two types of dopant sources. Originality/value In this work, the diffusion processes were made for two different types of dopant sources. The first one was the commercial available dopant paste from Filmtronics and the second one was the original prepared liquid dopant solution.

scholarly journals Medicinal Uses of Honey

2020 ◽  
pp. 8-12
Author(s):  
Mariia Nikolaevna Sarkisova ◽  
Natalia Viktorovna Biriukova
Keyword(s):  
Comparative Analysis ◽  
History Of Medicine ◽  
National Standards ◽  
Research Papers ◽  
Medicinal Uses ◽  
Stage Of Development ◽  
Different Types ◽  
History Of ◽  
Main Components ◽  
Current Stage

This article describes ways of using various types of honey in the history of medicine as well as its current stage of development. The authors consider the main components of different types of honey and the national standards of naturally sourced honey. An analysis of research papers on medical uses of honey has been performed, as well as a comparative analysis of recent honey-based medicines available in the pharmaceutical market. On the basis of collected data, some possible prospects for further use of honey in medicine have been outlined.

scholarly journals Galvanic Corrosion Behaviour of Phosphate Nodular Cast Iron in Different Types of Residual Waters and Couplings

2019 ◽  
Vol 70 (10) ◽  
pp. 3597-3602 ◽  
Author(s):  
Carmen Nejneru ◽  
Manuela Cristina Perju ◽  
Dumitru Doru Burduhos Nergis ◽  
Andrei Victor Sandu ◽  
Costica Bejinariu
Keyword(s):  
Cast Iron ◽  
Corrosion Behaviour ◽  
Galvanic Corrosion ◽  
Nodular Cast Iron ◽  
Low Alloy Steel ◽  
High Chemical ◽  
Different Types ◽  
Grey Cast ◽  
Main Components ◽  
Galvanic Corrosion Behaviour

The aim of this paper is to analyze the corrosion process that occurs in galvanic couplings of different alloys. The study focuses on materials that can come into contact in submersible pumps used by water treatment plants. Because, the rotor, one of the pump main components must possess high chemical and mechanical properties, nodular cast iron is usually used. Therefore, this is exposed in the same environment with different types of materials, such as aluminum, copper, bronze, grey cast iron, low alloy steel or stainless steel from which other components are made. The tests have been performed in three types of residual waters with neutral, acidic and basic pH. According to this study, the nodular cast iron galvanic corrosion resistance is highly improved by the phosphate layer deposited on its surface.

scholarly journals The Determinants Of Primary Employment In U.S. States

2021 ◽  
Vol 5 (3) ◽  
Author(s):  
Halil Dincer Kaya
Keyword(s):  
Small Business ◽  
Technology Use ◽  
Health And Safety ◽  
Business Owners ◽  
The Internet ◽  
Safety Regulations ◽  
Zoning Regulations ◽  
Different Types ◽  
Main Components ◽  
And Training

We examine the relationship between `primary employment` and `business friendliness` of U.S. states. Do states with a low score in `business friendliness` worry small business owners too much and hence force them to run their business as their primary job? We look at several main components of `business friendliness` including `Ease of start`, `Ease of hire`, `Overall regulations`, and `Training and networking`. We also look at subcomponents including the different types of regulations and technology use. How does each of these factors affect a business owner’s decision to focus mainly on his/her business? We use the `United States Small Business Friendliness Survey` done by Kauffman Foundation and Thumptack.com in 2013 and converted the letter scores ranging from A+ to F in the survey to numerical scores ranging from 12 to 1 (i.e. 1 being the lowest score which corresponds to F). Therefore, after the conversion, each state has a numerical score on each business-friendliness category. The survey also asks business owners if they use the internet when starting a business, when paying their taxes, or when licensing. For each state, we compute the percentage of owners in each state using the internet when starting a business, when paying their taxes, or when licensing. We call these three percentage numbers for each state their `Internetstart`, `Internettax`, and `Internetlicensing` scores. Then, using the mean score for all states for each type of regulation or internet score, we divide the states into two groups: the `high-score states` and the `low-score states`. In our analysis, we use non-parametric tests to compare the `high-score states` to the `low-score states`. Our non-parametric tests show that although none of the main components (i.e. `Ease of start`, `Ease of hire`, `Overall regulations`, and `Training and networking`) seem to affect `primary employment`, the overall business friendliness score of a state significantly affects `primary employment`. When we examine the different types of regulations, we find that `Health and safety regulations`, `Licensing regulations`, and `Zoning regulations` affect `primary employment`. `Employment regulations`, `Tax code`, or `Environmental regulations` does not have a significant impact. These findings may indicate that business owners are more worried with regard to Health and safety regulations, Licensing regulations, and Zoning regulations, therefore more of them choose to take matters into their own hands. Another possible explanation may be the relative complexity of the tasks associated with these regulations. Finally, our results show that technology use in the entrepreneurial process does not affect `Primary employment`.

Review of the Discussion Section of Research Articles: Rhetorical Structure and Move

2021 ◽  
Vol 8 (2) ◽  
pp. 9-25
Author(s):  
Yasir Bdaiwi Al-Shujairi
Keyword(s):  
Writing Process ◽  
Applied Linguistics ◽  
Research Articles ◽  
Discussion Section ◽  
Rhetorical Structure ◽  
Research Article ◽  
Scientific Disciplines ◽  
Different Types ◽  
Main Components

      The discussion section forms an integral part in the writing process of a research article (RA). Research authors find it difficult to write and produce a well-structured discussion for their findings. The reason could be due to the unawareness of the main components (rhetorical moves) that shape this section. Therefore, this paper aims to provide a review of the studies that have been done to analyze the discussion section of RAs over the last 36 years. Also, this review seeks to examine the discussion section of RAs across various scientific disciplines and different types of journals. The review showed that the rhetorical structure of RAs discussion section witnessed some changes over the course of time. New moves such as Research Implications and Research Limitations started to be parts of the discussion section of RAs. In addition, it was revealed that differences in writing the discussion section can be varied broadly across disciplines such as soft sciences (e.g., applied linguistics, sociology, psychology) and hard sciences (e.g., engineering, chemistry, biology) and slightly across types of journals such as ISI and local journals. In conclusion, this paper offered several suggestions for further research to be conducted in the area.  

Peculiarities of coping with stress among youngsters with various accentuation types

2021 ◽  
pp. 19-26
Author(s):  
Tatiana Razuvaeva ◽  
◽  
Maria Chuykova ◽  
A Lemzyakova ◽  
◽  
...  
Keyword(s):  
Young People ◽  
The State ◽  
Coping With Stress ◽  
Different Types ◽  
Main Components

The article is devoted to the study of the peculiarities of the experience of loneliness in young people with different types of accentuations. In this paper, the experience of loneliness is considered not only through the main components of this phenomenon (isolation, alienation, need for company, etc.), but also from the angle of the principle of casuality or the reasons why a person feels lonely. According to the data obtained as a result of our research, the need for psychocorrective work aimed at overcoming the feeling of loneliness and mastering the skills of coping with the state of loneliness in young people was justified.

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