scholarly journals Rapid resistance to pesticide control is predicted to evolve in an invasive fish

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Mark R. Christie ◽  
Maria S. Sepúlveda ◽  
Erin S. Dunlop
Keyword(s):  
Genetic Model ◽  
Sea Lamprey ◽  
Control Agent ◽  
Native Fish ◽  
Primary Control ◽  
Factors Affecting ◽  
Natal Homing ◽  
Generation Times ◽  
Evolution Of Resistance ◽  
Near Future

AbstractXenobiotic resistance is commonly found in species with short generation times such as bacteria, annual plants, and insects. Nevertheless, the fundamental evolutionary principles that govern the spread of resistance alleles hold true for species with longer generation times. One such example could occur with sea lamprey (Petromyzon marinus), a parasitic invasive species in the Laurentian Great Lakes that decimated native fish populations prior to its control with the pesticide 3-trifluoromethyl-4-nitrophenol (TFM). Since the 1950s, tributaries have been treated annually with TFM, where treatments effectively remove most, but not all, larval sea lamprey. We developed an eco-genetic model of sea lamprey to examine factors affecting the evolution of resistance and found that resistance alleles rapidly rise to fixation after 40–80 years of treatment, despite the species’ relatively long generation time (4–7 years). The absence of natal homing allows resistant individuals to spread quickly throughout the entire system, but also makes the early detection of resistance challenging. High costs of resistance and density independent reproduction can delay, but not prevent, the onset of resistance. These results illustrate that sea lamprey have the potential to evolve resistance to their primary control agent in the near future, highlighting the urgent need for alternative controls.

scholarly journals Rapid resistance to pesticide control is predicted to evolve in an invasive fish

2019 ◽  
Author(s):  
Mark R. Christie ◽  
Maria S. Sepúlveda ◽  
Erin S. Dunlop
Keyword(s):  
Genetic Model ◽  
Sea Lamprey ◽  
Control Agent ◽  
Native Fish ◽  
Primary Control ◽  
Factors Affecting ◽  
Natal Homing ◽  
Generation Times ◽  
Evolution Of Resistance ◽  
Near Future

AbstractXenobiotic resistance is commonly found in species with short generation times such as bacteria, annual plants, and insects. Nevertheless, the fundamental evolutionary principles that govern the spread of resistance alleles hold true for species with longer generation times. One such example could occur with sea lamprey (Petromyzon marinus), a parasitic invasive species in the Laurentian Great Lakes that decimated native fish populations prior to its control with the pesticide 3-trifluoromethyl-4-nitrophenol (TFM). Since the 1950s, tributaries have been treated annually with TFM, where treatments effectively remove most, but not all, larval sea lamprey. We developed an eco-genetic model of sea lamprey to examine factors affecting the evolution of resistance and found that resistance alleles rapidly rise to fixation after 40-80 years of treatment, despite the species’ relatively long generation time (4-7 years). The absence of natal homing allows resistant individuals to spread quickly throughout the entire system, but also makes the early detection of resistance challenging. High costs of resistance and density independent reproduction can delay, but not prevent, the onset of resistance. These results illustrate that sea lamprey have the potential to evolve resistance to their primary control agent in the near future, highlighting the urgent need for alternative controls.

EFFECTS OF ENVIRONMENT ON GROWING HYDROPONICS MAIZE FODDER USING LOW-COST GREENHOUSE CULTIVATING UNIT FOR LIVESTOCK PRODUCTION.

2021 ◽  
pp. 71-72
Author(s):  
Adamu, B. ◽  
Abdullahi, S. ◽  
Saidu, S. G ◽  
Yustus Sunday Francis
Keyword(s):  
Relative Humidity ◽  
Environmental Factors ◽  
Production System ◽  
Low Cost ◽  
Factors Affecting ◽  
Production Water ◽  
Fodder Production ◽  
Food Requirement ◽  
Greenhouse Cultivation ◽  
Near Future

The term 'Hydroponics' was derived from Greek words 'hydro' means water and 'ponics' means labor. Hydroponic is a modern agricultural technique that uses nutrient solution rather than soil solution for fodder production. As population increases the food demand also increased, the existing system of agriculture will not be able to meet the food requirement in the near future due to environmental challenges in the industry. The major environmental factors affecting the hydroponics production system are; Temperature, relative humidity, and light. The objectives of this studies are to examine the hydroponics greenhouse technologies, impact of environmental factors on hydroponics greenhouse cultivation and challenges of growing on hydroponics greenhouse system. This study revealed that hydroponics greenhouse cultivation is a better option for improved fodder production, water utilization, palatability and digestibility.

Improvement of the Process of Mechanical Dehydration of Five-Layer Wet Leather Semi-finished Products

2021 ◽  
Author(s):  
Auezhan T. Amanov ◽  
◽  
Gayrat A. Bahadirov ◽  
Gerasim N. Tsoy ◽  
Ayder M. Nabiev ◽  
...  
Keyword(s):  
Base Plate ◽  
Design Matrix ◽  
Feed Speed ◽  
Mathematical Planning ◽  
Optimal Method ◽  
Factors Affecting ◽  
Squeeze Out ◽  
Excess Moisture ◽  
Near Future ◽  
Experimental Bench

To improve the process of mechanical dehydration of semi-finished wet leather products, a multilayer dehydration using felt materials – monshons was experimentally investigated. The process is conducted by vertical feed of semi-finished wet leather products on a base plate between rotating squeezing rollers. The D-optimal method of mathematical planning of the experiment and the Kano design matrix were used for conducting experiments. The multi-layer package consists of five layers of semi-finished wet leather products and two layers of moistureremoving materials between each layer, folded over the base plate. The studies were carried out in laboratory conditions on an experimental bench, taking into account the production parameters of processing. As a result of the study, mathematical dependences of the amount of removed moisture for each of five layers of semifinished wet leather product on the feed speed and the pressure of the squeezing rollers were derived. The analysis of the results showed that, with the existing parameters of mechanical dehydration, it was possible to simultaneously squeeze out moisture from five layers of the semi-finished leather product with a minimum pressure of the squeezing rollers and an average feed speed. The productivity of the technological process was more than five times higher in comparison with the productivity of similar roller machines. In the near future, this research methodology will be used to determine the technological factors affecting the extraction of excess moisture from a package consisting of ten semi-finished wet leather products and moisture-removing materials.

A Review of Preparation and Tribological Applications of Pickering Emulsion

2021 ◽  
pp. 1-27
Author(s):  
Yichen Bao ◽  
Kai Liu ◽  
Quan Zheng ◽  
Lulu Yao ◽  
Yufu Xu
Keyword(s):  
Pickering Emulsion ◽  
Solid Particles ◽  
Preparation Methods ◽  
Factors Affecting ◽  
Long Term Stability ◽  
New Strategy ◽  
New Type ◽  
The Stability ◽  
Near Future

Abstract Pickering emulsion is a new type of stable emulsion made by ultra-fine solid particles instead of traditional surfactants as stabilizers, which has received widespread attention in recent years. The preparation methods of stator-rotor homogenization, high-pressure homogenization, and ultrasonic emulsification were compared with others in this work. The main factors affecting the stability of Pickering emulsion are the surface humidity of the solid particles, the polarity of the oil phase, and the oil-water ratio. These factors could affect the nature of the solid particles, the preparation process of Pickering emulsion and the external environment. Consequently, the long-term stability of Pickering emulsion is still a challenge. The tribological investigations of Pickering emulsion were summarized, and the multifunctional Pickering emulsion shows superior prospects for tribological applications. Moreover, the latest development of Pickering emulsion offers a new strategy for smart lubrication in the near future.

scholarly journals Swedish House Owners’ Intentions Towards Renovations: Is there a Market for One-Stop-Shop?

Buildings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 164 ◽  
Author(s):  
Georgios Pardalis ◽  
Krushna Mahapatra ◽  
Giangiacomo Bravo ◽  
Brijesh Mainali
Keyword(s):  
Financial Incentives ◽  
Energy Savings ◽  
Online Questionnaire ◽  
Level Of Involvement ◽  
Factors Affecting ◽  
Younger Age ◽  
One Stop ◽  
Near Future ◽  
Selection Of

In this paper, we examine factors affecting owners’ intention for renovation of their detached houses. Furthermore, we analyze their interest in choosing a one-stop-shop (OSS) service for the renovation, even though such a concept is not yet established in Sweden, but emerging in other parts of Europe. Our study is based on responses to an online questionnaire survey of 971 house owners residing in Kronoberg Region in Sweden. About 76% of the respondents intend to renovate in the near future, with approximately 71% of them preferring to renovate individual components of their dwelling and 5% to renovate their whole house in steps. House owners of younger age, higher income, higher education, and those with an interest for environmental issues, were the ones most interested in physical renovations, which improves energy efficiency of the building. For those house owners, one-stop-shop can facilitate the decision-making process, and help them to choose those measures that will improve their quality of life. Approximately 20% of the respondents had a positive view towards an one-stop-shop, which is an indicator that market for such a service exists. Parameters such as quality of work, cost and energy savings and specification of measures to be adopted are the key for the promotion of one-stop-shop. Additionally, house owners want to have a certain level of involvement in the selection of actors performing the renovation. Moreover, financial incentives, e.g., loans, do not play a significant role for the selection of one-stop-shop, but act as complementary motive for house owners.

scholarly journals Will the Thai ABC Car Owners, Buy a Smart ABC Car? a Case Study in Bangkok Metropolis

2018 ◽  
Vol 7 (3.30) ◽  
pp. 202
Author(s):  
Keerati Sittichainarong ◽  
Aaron Loh ◽  
Preecha Methavasaraphak ◽  
John Barnes
Keyword(s):  
Automobile Industry ◽  
Autonomous Vehicles ◽  
New Technology ◽  
Influential Factors ◽  
Self Identity ◽  
Factors Affecting ◽  
Intent To Purchase ◽  
Intention To Purchase ◽  
Near Future

Thailand is the biggest manufacturer of trucks and cars outside of Japan and China in Asia. Many had reported that "smart" technology especially that which leads towards driverless or autonomous vehicles will be the most important single development that will affect the automobile industry both domestically and globally.  Hence this research is therefore on the readiness of Thai car owners to adopt the new technology and the intention to purchase a smart car in the near future. Specifically, it is a case study on the influential factors affecting the intent to purchase a smart car by owners of a top Japanese brand in Bangkok. A questionnaire survey was conducted on 385 existing car owners of the Japanese brand under consideration in metropolitan areas of Bangkok and the data returned analyzed by multiple linear regression. The outcome of the research pointed towards ‘Self-identity” and ‘Emotional connection’ as the most influential factors towards the intent to purchase a smart car.  

Factors Affecting Sea Lamprey Egg Survival

2009 ◽  
Vol 29 (4) ◽  
pp. 859-868 ◽  
Author(s):  
Stephen J. Smith ◽  
J. Ellen Marsden
Keyword(s):  
Sea Lamprey ◽  
Egg Survival ◽  
Factors Affecting

Ichneumon promissorius (Erichson) (Hymenoptera: Ichneumonidae): Factors Affecting Fecundity, Oviposition, and Longevity

1995 ◽  
Vol 30 (2) ◽  
pp. 279-286 ◽  
Author(s):  
J. E. Carpenter
Keyword(s):  
Helicoverpa Zea ◽  
Biological Control Agent ◽  
Soil Surface ◽  
The United States ◽  
Control Agent ◽  
Pest Species ◽  
Laboratory Rearing ◽  
Factors Affecting ◽  
Preoviposition Period ◽  
Host Pupa

Ichneumon (=Pterocormus) promissorius (Erichson) (Hymenoptera: Ichneumomidae), a native of Australia, is a pupal parasitoid which searches the soil surface for host pupation sites, burrows into a pupal gallery, and oviposits in the host pupa. Fecundity and rate of oviposition were influenced by the mating status of females, the host from which females developed, and the frequency in which females were exposed to hosts. Virgin females continued laying eggs many days after mated females had stopped. A preoviposition period of 17 d in mated females did not affect the oviposition curve or the number of eggs laid, suggesting that the oogenesis is arrested until female wasps are exposed to host pupae. Female wasps exposed to pupae for 24 h every fifth day lived longer than female wasps continuously exposed to pupae. However, females that were continuously exposed to pupae laid more eggs. Virgin females reared on Spodoptera exigua (Hübner) pupae laid fewer eggs than virgin females reared on Helicoverpa zea (Boddie) pupae. These data will be important in evaluating the potential of I. promissorius as a biological control agent for pest species in the United States and will be useful in developing laboratory rearing procedures for I. promissorius.

Temporal distance and blood donation intention

2011 ◽  
Vol 17 (4) ◽  
pp. 590-599 ◽  
Author(s):  
Soe Yoon Choi ◽  
Hee Sun Park ◽  
Ju Yeon Oh
Keyword(s):  
Social Desirability ◽  
Blood Donation ◽  
Time Frame ◽  
Factors Affecting ◽  
One Year ◽  
The One ◽  
Donation Intention ◽  
Time Frames ◽  
Near Future ◽  
The Relationship

This study tested Construal Level Theory and examined social desirability and cultural differences as factors affecting blood donation intention across different time frames. Findings showed that individuals indicated stronger intentions for the distant future (one-year and no-time indication frames) than for the near future (one-week and three-month frames). The relationship between social desirability rating of blood donation and intention was positive and significant for the no-time indication frame, but it was not significant for the one-week time frame and the three-month time frame. Koreans and Americans did not differ in the relationship between social desirability and intentions across different time frames.

scholarly journals Investigating factors for disaster preparedness among residents of Kuala Lumpur

2014 ◽  
Vol 2 (5) ◽  
pp. 3683-3709 ◽  
Author(s):  
E. Mohammad-pajooh ◽  
K. Ab. Aziz
Keyword(s):  
Disaster Preparedness ◽  
Significant Contribution ◽  
Flash Flood ◽  
Kuala Lumpur ◽  
Factors Affecting ◽  
Correlation And Regression Analysis ◽  
Demographic Indicators ◽  
High Level ◽  
Social Demographic ◽  
Near Future

Abstract. The review of past researches discussed that factors such as climate change and movement toward urbanization will result in more frequent and severe disasters in the near future (Yasuhara et al., 2011). Flash flood is the most common type of disaster that residents of Kuala Lumpur (KL) come across, thus in this study, it was desired to discover the factors affecting preparedness among residents of KL as well as assessing the variation of individual preparedness among residents. With the aid of SPSS analysis, the reliability of data, correlation and regression analysis between the investigated factors and disaster preparedness were obtained. According to this research it was found that level of preparedness of residents of KL is still below average; majority of social demographic indicators such as income, education, age, and property ownership showed significant contribution to the variation of disaster preparedness among the residents. For instance men were much more prepared in comparison to women; residents with high level of income and education had also significantly higher preparedness compared to those with low level of income and education. Race was the only factor that differs from the findings of previous studies; since race does not affect the preparedness.

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