scholarly journals Effects of Exogenous Application of Indole-3-Butyric Acid on Maize Plants Under Cadmium Stress

2021 ◽  
Author(s):  
Kristína Šípošová ◽  
Eva Labancová ◽  
Danica Kučerová ◽  
Karin Kollárová ◽  
Zuzana Vivodová
Keyword(s):  
Butyric Acid ◽  
Toxic Metal ◽  
Cadmium Stress ◽  
Cd Stress ◽  
Negative Effects ◽  
Positive Effects ◽  
Cadmium Treatment ◽  
Wide Range ◽  
Maize Plants ◽  
Positive Effect

Abstract Exogenously-applied auxins can alleviate the toxicity of various metals and improve a plant’s tolerance to stress. Cadmium (Cd) is a toxic metal that has a wide range of negative effects on plants. The mechanisms that result in the positive effects of auxins on stressed plants are still not fully understood. In the present study, we found that the application of indole-3-butyric acid (IBA) in concentration 10− 9 M had positive effect on the plants cultivated in the presence of Cd. IBA caused changes in the growth and morphology of the maize also under non-stress conditions; hence, we were able to select three concentrations of IBA (10− 7 M as inhibitory, 10− 8 M as non-effective, and 10− 11 M as stimulatory). Cadmium treatment increased the concentration of H2O2 and the activity of the antioxidant enzymes: superoxide dismutase (SOD), ascorbate peroxidase (APX), and catalase (CAT), while IBA (10− 9 M) ameliorated its negative effects. IBA affected the content of macronutrients and micronutrients in roots in relation to the concentration of applied IBA and the presence of Cd in the solution. The heatmap visualises the differences between the Cd and Cd + IBA effects on all parameters studied, and indicates the positive effects of IBA (10− 9 M) during Cd stress.

scholarly journals Application of the C-S-H Phase Nucleating Agents to Improve the Performance of Sustainable Concrete Composites Containing Fly Ash for Use in the Precast Concrete Industry

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6514
Author(s):  
Grzegorz Ludwik Golewski ◽  
Bartosz Szostak
Keyword(s):  
Fly Ash ◽  
Industrial Waste ◽  
Precast Concrete ◽  
High Strength ◽  
Nucleating Agents ◽  
Negative Effects ◽  
Sustainable Concrete ◽  
Wide Range ◽  
Time Periods ◽  
Positive Effect

Siliceous fly ash (FA) is the main additive to currently produced concretes. The utilization of this industrial waste carries an evident pro-ecological factor. In addition, such actions have a positive effect on the structure and mechanical parameters of mature concrete. Unfortunately, the problem of using FA as a Portland cement replacement is that it significantly reduces the performance of concretes in the early stages of their curing. This limits the possibility of using this type of concrete, e.g., in prefabrication, where it is required to obtain high-strength composites after short periods of curing. In order to minimize these negative effects, this research was undertaken to increase the early strength of concretes with FA through the application of a specifically formulated chemical nano-admixture (NA) in the form of seeds of the C-S-H phase. The NA was used to accelerate the strength growth in concretes. Therefore, this paper presents results of tests of modified concretes both with the addition of FA and with innovative NA. The analyses were carried out based on the results of the macroscopic and microstructural tests in five time periods, i.e., after 4, 8, 12, 24 and 72 h. The results of tests carried out with the use of NA clearly indicate the possibility of using FA in a wide range of management areas in sustainable concrete prefabrication.

Comparison of lactational responses of dairy cows in Georgia and Israel to heat load and photoperiod

2002 ◽  
Vol 75 (3) ◽  
pp. 469-476 ◽  
Author(s):  
Y. Aharoni ◽  
O. Ravagnolo ◽  
I. Misztal
Keyword(s):  
Milk Yield ◽  
Heat Load ◽  
Protein Concentration ◽  
Day Length ◽  
Seasonal Effects ◽  
Good Match ◽  
Negative Effects ◽  
Positive Effects ◽  
Daily Change ◽  
Positive Effect

AbstractThe seasonal effects of heat load and photoperiod on yield and composition of milk from primiparous cows in the course of lactation were studied using test day records from 8968 primiparous cows on 76 farms in Georgia, collected from 1990 through 1997. The effect of prepartum photoperiod on milk production in the subsequent lactation of these cows was also evaluated. These estimated seasonal effects were compared with those estimated for 4728 primiparous cows on 13 farms, and for 1538 multiparous cows on three farms during consecutive lactations in Israel from 1994 through 1996. During lactation, the day length had a positive effect on milk yield and negative effects on fat and protein concentrations in the milk, but the daily change in day length had positive effects on milk yield and fat concentration, and a smaller positive effect on protein concentration. The day length during the prepartum period had negative effects on milk yield and fat and protein concentrations. The heat load during lactation had negative effects on milk yield and fat and protein concentrations. Most of the effects were highly (P < 0·001) significant. There was a very good match between the results obtained for primiparous cows in Georgia and Israel, for the combined effects of heat load and photoperiod during lactation on milk yield and protein and fat concentrations. The match between primiparous and multiparous cows in Israel was better for milk yield and protein concentration than for fat concentration. The estimated effects of pre-partum photoperiod were higher for multiparous cows in Israel than for primiparous cows in either country.

scholarly journals The societal influences and quality of life among healthcare team members under COVID-19 pandemic

2021 ◽  
Author(s):  
Wei-Tsung Kao ◽  
Su-Ting Hsu ◽  
Frank Huang-Chih Chou ◽  
Li-Shiu Chou ◽  
Kuan-Ying Hsieh ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Older Age ◽  
Healthcare Team ◽  
Negative Effects ◽  
Team Members ◽  
Positive Effects ◽  
Societal Influences ◽  
Positive Effect ◽  
Ptsd Severity

Abstract Background: The corona virus infection disease 2019 (COVID-19) pandemic is likely to put healthcare professionals across the world in an unprecedented situation. Methods: 683 healthcare workers were recruited in this study. Short form-12 items (SF-12), Societal Influences Survey Questionnaire (SISQ), and Disaster-Related Psychological Screening Test (DRPST) were used to survey participants. Multiple linear regression and structural equation model (SEM) were used to explore the possible factors to the societal influences and quality of life. Results: Female, older, more education years, married, regular intake and posttraumatic stress disorder (PTSD) frequency had positive effects to SISQ. To physical component summary (PCS) of SF-12, chronic illness, sleep score, PTSD frequency and social distance had negative effects and exercise habits had positive effect. To mental component summary (MCS) value of SF-12, age, participate in clubs, volunteer or charity activities and social information had positive effects and PTSD frequency, sleep score, social anxiety and depression had negative effects. Under SEM analysis, PTSD had positive effect to SISQ. Sleep score and MCS value had negative effects to SISQ. PTSD severity, older age, Sleep score, smoking and Nursing staff had negative effects to PCS value. Young age, PTSD frequency, sleep score and depression had negative effects to MCS value. Conclusion: Healthcare team members with severer PTSD symptoms suffered more societal influences. Relative to PTSD severity, PTSD frequency was more important to the quality of life. Members of older age, who frequently participate in clubs, volunteers or charity activities had better mental life quality.

scholarly journals Effect of Equity Financing Options on Financial Performance of Non-Financial Firms Listed at the Nairobi Securities Exchange, Kenya

2018 ◽  
Vol 5 (4) ◽  
pp. 160
Author(s):  
Benter Omollo Achieng ◽  
Willy Muturi ◽  
Joshua Wanjare
Keyword(s):  
Capital Structure ◽  
Corporate Finance ◽  
Financial Performance ◽  
Ordinary Least Squares ◽  
Negative Effects ◽  
Equity Financing ◽  
Financial Firms ◽  
Positive Effects ◽  
Retained Earnings ◽  
Positive Effect

Corporate finance managers worldwide have for a long time consistently sought to maximize shareholders’ wealth and their firm’s market value through their decisions on firm’s capital structure. However, both scholars and practitioners of corporate finance are yet to agree on the optimal mix of equity and debt that maximizes a firm’s financial performance. The purpose of this study was to examine the effects of equity financing options namely common stock (CS), retained earnings (REN) and total equity (TED) as ratios of total assets on the financial performance measured as return on assets (ROA) and return on equity (ROE) of Kenya’s listed firms. Utilizing panel econometric techniques namely pooled ordinary least squares (OLS), fixed effects (FE) and random effects (RE), the study analyzes the effects of equity variables as ratios of total assets on the financial performance of 40 non-financial firms listed at the Nairobi Securities Exchange between 2009 and 2015. The study’s empirical results show that CS ratio significantly and negatively affects ROA while REN ratio has a statistically significant and positive effect on ROA. Overall, TE ratio positively and significantly affects ROA. On the contrary, ROE is not significantly affected by the equity variables in the sample. While the non-significant effects of equity on ROE find support in Modigliani and Miller’s capital structure irrelevance theory, the positive effects of REN ratio and the negative effects of CS ratio on ROA, which are largely supported by the trade-off theory, may explain the pecking order theory’s prioritization of internal capital sources over debt and equity issuances. Thus, corporate finance managers should find a place for internal financing options particularly retained earnings to maximize equity holders’ returns on assets employed. Additionally, corporate finance managers should endeavour to minimize on the use of CS due to its negative effects on shareholder earnings on their assets. Nonetheless, a reasonable balance between CS and REN should be considered since the positive effect between TE and ROA is an appraisal for an optimum mix of equity financing options.

scholarly journals Emotions Among Students Engaging in Connectivist Learning Experiences

2020 ◽  
Vol 21 (2) ◽  
pp. 98-117
Author(s):  
Alaa A AlDahdouh
Keyword(s):  
Distance Education ◽  
Student Performance ◽  
Learning Environments ◽  
Negative Emotions ◽  
General Rule ◽  
Effect Data ◽  
Positive Effects ◽  
Think Aloud Protocol ◽  
Wide Range ◽  
Positive Effect

Emotion has long been a question of great interest in a wide range of fields. As a general rule, emotions are categorized as positive, which we seek, and negative, from which we turn away. However, empirically-backed connectivists claim that even negative emotions produce positive effects on student performance. What is less clear is how this process happens. This study had two primary aims. First, to assess the prevalence and distribution of emotions in connectivist environments. Second, to provide in-depth and experiment-based analysis that shows how and when negative emotions have their positive effect. Data for this study were mainly collected using an aided think-aloud protocol with nine participants, each of whom received ten tasks. Findings of the current study confirmed the dominance of negative emotions in connectivist learning environments and presented a model that could explain the variation of empirical results. Implications for researchers and teachers in distance education are discussed.

Positive and negative effects of allochthonous dissolved organic matter and inorganic nutrients on phytoplankton growth

2002 ◽  
Vol 59 (1) ◽  
pp. 85-95 ◽  
Author(s):  
Jennifer L Klug
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Phytoplankton Community ◽  
Phytoplankton Growth ◽  
Inorganic Nutrients ◽  
Physiological Status ◽  
Negative Effects ◽  
Positive Effects ◽  
Negative Effect ◽  
Positive Effect

Dissolved organic matter (DOM) can have both positive and negative effects on phytoplankton growth. The magnitude of these effects may vary depending on the source of DOM and the composition of the phytoplankton community. Here, I address the relative importance of the positive and negative effects of DOM extracts on phytoplankton growth. In short-term experiments with phytoplankton from West Long Lake, a small, moderately coloured lake in northern Michigan, U.S.A., the net effect of doubling ambient DOM on phytoplankton growth was positive. Increasing DOM concentrations from ~10 mg C·L–1 to ~20 mg C·L–1 had a negative effect on total phytoplankton growth by reducing irradiance and thus reducing the depth to which growth was positive. However, inorganic nutrients in the DOM extracts increased growth at each irradiance level. The positive effect on phytoplankton growth owing to the nutrients associated with DOM was greater than the negative effect caused by shading. Although the positive effects of allochthonous DOM inputs outweighed the negative effects for the nutrient-limited phytoplankton in these experiments, the net effect depends on the concentration and availability of nutrients associated with allochthonous DOM as well as the physiological status of the phytoplankton community.

scholarly journals Machiavellianism dimensions, religiosity, social environment, and tax evasion

2021 ◽  
Vol 24 (1) ◽  
pp. 1-26
Author(s):  
Jean Stevany Matitaputty ◽  
Priyo Hari Adi
Keyword(s):  
Social Environment ◽  
Tax Evasion ◽  
Online Survey ◽  
Sampling Method ◽  
Sampling Technique ◽  
Snowball Sampling ◽  
Negative Effects ◽  
Positive Effects ◽  
Negative Effect ◽  
Positive Effect

This research aims to investigate the effects of Machiavellianism dimensions that consist of the use of manipulative tactics, cynical views, and disregard of conventional morality on tax evasion. Further, we also analyze the effects of religiosity and social environment as the variables that control Machiavellianism behavior. The population in this research are individual taxpayers, and the sampling technique used is an online survey with the snowball sampling method. The criteria used in sampling are taxpayers who are self-employed or entrepreneurs.  The data is then analyzed using the univariate and multivariate General Linear Model (GLM) methods. The results show that manipulative tactics and disregard of conventional morality have positive effects on tax evasion. Meanwhile, cynical views have a negative effect on tax evasion. Further, religiosity has negative effects on the use of manipulative tactics and disregard of conventional morality. Lastly, social environment has a positive effect on cynical views but no significant effects on the use of manipulative tactics and disregard of conventional morality.

scholarly journals Termites Are Associated with External Species-Specific Bacterial Communities

2020 ◽  
Vol 87 (2) ◽  
Author(s):  
Patrik Soukup ◽  
Tomáš Větrovský ◽  
Petr Stiblik ◽  
Kateřina Votýpková ◽  
Amrita Chakraborty ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Amplicon Sequencing ◽  
Rrna Gene ◽  
Negative Effects ◽  
Termite Species ◽  
Positive Effects ◽  
Operational Taxonomic Units ◽  
Wide Range ◽  
Species Specific ◽  
And Control

ABSTRACT All termites have established a wide range of associations with symbiotic microbes in their guts. Some termite species are also associated with microbes that grow in their nests, but the prevalence of these associations remains largely unknown. Here, we studied the bacterial communities associated with the termites and galleries of three wood-feeding termite species by using 16S rRNA gene amplicon sequencing. We found that the compositions of bacterial communities among termite bodies, termite galleries, and control wood fragments devoid of termite activities differ in a species-specific manner. Termite galleries were enriched in bacterial operational taxonomic units (OTUs) belonging to Rhizobiales and Actinobacteria, which were often shared by several termite species. The abundance of several bacterial OTUs, such as Bacillus, Clostridium, Corynebacterium, and Staphylococcus, was reduced in termite galleries. Our results demonstrate that both termite guts and termite galleries harbor unique bacterial communities. IMPORTANCE As is the case for all ecosystem engineers, termites impact their habitat by their activities, potentially affecting bacterial communities. Here, we studied three wood-feeding termite species and found that they influence the composition of the bacterial communities in their surrounding environment. Termite activities have positive effects on Rhizobiales and Actinobacteria abundance and negative effects on the abundance of several ubiquitous genera, such as Bacillus, Clostridium, Corynebacterium, and Staphylococcus. Our results demonstrate that termite galleries harbor unique bacterial communities.

scholarly journals Environmental Regulation, Two-Way Foreign Direct Investment, and Green Innovation Efficiency in China’s Manufacturing Industry

2018 ◽  
Vol 15 (10) ◽  
pp. 2292 ◽  
Author(s):  
Zhijun Feng ◽  
Bo Zeng ◽  
Qian Ming
Keyword(s):  
Foreign Direct Investment ◽  
Panel Data ◽  
Environmental Regulation ◽  
Direct Investment ◽  
Manufacturing Industry ◽  
Green Innovation ◽  
Negative Effects ◽  
Positive Effects ◽  
The Impact ◽  
Positive Effect

This paper adopts 2009 to 2015 panel data from 27 manufacturing industries in China. A Super-SBM model is used to measure the green innovation efficiency (GIE) of China’s manufacturing industry. A panel data model is then built to systematically examine the impact of environmental regulation (ER) and two-way foreign direct investment (FDI) on the GIE of China’s manufacturing industry under a unified analysis framework. The results are as follows: (1) the overall level of the green innovation efficiency in China’s manufacturing is low, and there is still great potential for improvement. Considering industry heterogeneity, the green innovation efficiency of patent-intensive manufacturing is significantly higher than that of non-patent-intensive manufacturing; (2) in terms of the whole manufacturing industry, ER and the interaction between ER and outward foreign direct investment (OFDI) have significantly negative effects on GIE, OFDI has significantly positive effects on GIE. (3) when considering industry heterogeneity, for patent-intensive manufacturing, ER and the interaction between ER and inward foreign direct investment (IFDI) have significantly negative effects on GIE, while IFDI has significantly positive effect on GIE. For non-patent-intensive manufacturing, ER and the interaction between ER and OFDI have significantly negative effects on GIE, while IFDI and the interaction between ER and IFDI have significantly positive effects on GIE.

The Influence of Unsportsmanlike Fouls on Basketball Teams’ Performance According to Context-Related Variables

2016 ◽  
Vol 11 (5) ◽  
pp. 664-670 ◽  
Author(s):  
Miguel-Ángel Gómez ◽  
Enrique Ortega Toro ◽  
Philip Furley
Keyword(s):  
Regression Models ◽  
Term Effect ◽  
Linear Regression Models ◽  
Negative Effects ◽  
Short Term ◽  
Positive Effects ◽  
Positive Effect ◽  
Score Line ◽  
Basketball Teams

The aim of the current study was to analyze the temporal effects that unsportsmanlike fouls may have on basketball teams’ scoring performance under consideration of context-related variables. The authors analyzed 130 unsportsmanlike fouls from 362 elite basketball games (men’s and women’s Olympic Games, European and World Championships). The context-related variables studied were score-line, quality of opposition, timeout situation, minutes remaining, and player status. The data were analyzed with linear-regression models. The results showed that both teams (the team that made the foul and the opponent) had similar positive scoring performances during 1 and 3 ball possessions after the unsportsmanlike foul (short-term effect). However, 5 ball possessions after the foul (midterm effect), the team that made the foul had a scoring disadvantage (−0.96) and the opponent team an advantage (0.78). The context-related variable quality of opposition was significant only during 1 ball possession, with negative effects for the team that made the foul and positive effects for the opponent. The final outcome showed a positive effect for score-line when the unsportsmanlike foul was made (0.96) and for quality of opposition (0.64).

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