scholarly journals Differences in the Structural Components Influence the Pumping Capacity of Marine Sponges

2021 ◽  
Vol 8 ◽  
Author(s):  
Azraj S. Dahihande ◽  
Narsinh L. Thakur
Keyword(s):  
Positive Relationship ◽  
Negative Relationship ◽  
Dry Weight ◽  
Dry Mass ◽  
Marine Sponges ◽  
Body Plan ◽  
Microbial Abundance ◽  
Structural Components ◽  
Pumping Rate ◽  
Aquiferous System

Marine sponges are important sessile, benthic filter feeders with a body plan designed to pump water efficiently. The sponge body plan generally consists of mineral spicules, gelatinous mesohyl, and the pores and canals of the aquiferous system. These structural components have stark differences in compressibility, mass, and volume; therefore, their proportion and distribution are likely to affect sponge morphology, anatomy, contraction, and finally the pumping capacity. We examined seven demosponge species (from high spicule skeleton contents to no spicules) commonly found along the central west coast of India for structural components, such as total inorganic contents (spicule skeleton and foreign inclusions), body density, porosity, and mesohyl TEM for the high microbial abundance/low microbial abundance status. Additionally, we estimated the sponge pumping rate by measuring the excurrent velocity, the abundance of individual pumping units and cells, i.e., choanocyte chambers and choanocytes, and also carried out a morphometric analysis of aquiferous structures. The excurrent velocity and the oscular flow rates showed a positive relationship with the oscular crosssectional area for all the study species. The inorganic spicule contents by their weight as well as volume formed a major component of tissue density and higher proportions of spicules were associated with reduced aquiferous structures and lower pumping rate. The ash mass% and the ash free dry weight (AFDW %) in the sponge dry mass showed separate and distinct associations with aquiferous system variables. For example, the number of choanocytes per chamber showed a wide difference between the studied species ranging from 35.02 ± 2.44 (C. cf. cavernosa) to 120.35 ± 8.98 (I. fusca) and had a significant positive relationship with AFDW% and a negative relationship with ash mass%. This study indicates that the differences in the proportions of structural components are closely related to sponge gross morphology, anatomy, and probably body contractions, factors that influence the sponge pumping capacity.

STEM measurement of subcellular water distributions

1993 ◽  
Vol 51 ◽  
pp. 568-569
Author(s):  
R.D. Leapman ◽  
S.Q. Sun ◽  
S-L. Shi ◽  
R.A. Buchanan ◽  
S.B. Andrews
Keyword(s):  
Water Content ◽  
Internal Standard ◽  
Dry Weight ◽  
Dry Mass ◽  
Scanning Transmission Electron Microscope ◽  
Dark Field ◽  
Bulk Water ◽  
Inelastic Electron ◽  
Scanning Transmission ◽  
Annular Dark Field

Recent advances in rapid-freezing and cryosectioning techniques coupled with use of the quantitative signals available in the scanning transmission electron microscope (STEM) can provide us with new methods for determining the water distributions of subcellular compartments. The water content is an important physiological quantity that reflects how fluid and electrolytes are regulated in the cell; it is also required to convert dry weight concentrations of ions obtained from x-ray microanalysis into the more relevant molar ionic concentrations. Here we compare the information about water concentrations from both elastic (annular dark-field) and inelastic (electron energy loss) scattering measurements.In order to utilize the elastic signal it is first necessary to increase contrast by removing the water from the cryosection. After dehydration the tissue can be digitally imaged under low-dose conditions, in the same way that STEM mass mapping of macromolecules is performed. The resulting pixel intensities are then converted into dry mass fractions by using an internal standard, e.g., the mean intensity of the whole image may be taken as representative of the bulk water content of the tissue.

Organization-Based Self-Esteem Affects Employees' Exchange Relationship Perceptions and Extrarole Behavior

2016 ◽  
Vol 44 (3) ◽  
pp. 509-517 ◽  
Author(s):  
Yanhan Zhu
Keyword(s):  
Social Exchange ◽  
Positive Relationship ◽  
Mainland China ◽  
Negative Relationship ◽  
Self Esteem ◽  
Moderating Effect ◽  
Exchange Relationship ◽  
Significant Positive Relationship ◽  
Significant Negative Relationship ◽  
Practical Implications

The 2 types of exchange relationship perceptions—social exchange relationship perceptions (SERPs) and economic exchange relationship perceptions (EERPs)—constitute the primary concept for understanding individual behavior in the workplace. Using a sample of 581 employees from Mainland China, I explored the effects of SERPs and EERPs on employee extrarole behavior (ERB), as well as the moderating effect of organization-based self-esteem (OBSE) on the relationships between SERPs and ERB, and between EERPs and ERB. The results revealed a significant positive relationship between SERPs and ERB, a significant negative relationship between EERPs and ERB, and a significant moderating effect for OBSE. Theoretical and practical implications of these findings are discussed.

Attachment to God and Quest as Moderators of the Relationship between Religious Doubt and Mental Health

2021 ◽  
pp. 009164712199240
Author(s):  
Noah S. Love ◽  
Cassidy A. Merlo ◽  
M. Elizabeth Lewis Hall ◽  
Peter C. Hill
Keyword(s):  
Mental Health ◽  
Positive Relationship ◽  
Mental Health Problems ◽  
Negative Relationship ◽  
Health Problems ◽  
Positive Mental Health ◽  
Attachment To God ◽  
Religious Doubt ◽  
Avoidant Attachment ◽  
The Relationship

The present study examined attachment to God and quest as potential moderators of the relationship between religious doubt and mental health. A sample of Christian participants ( N = 235) completed a survey which included measures of attachment to God, quest, religious doubt, and mental health. As hypothesized, attachment to God and quest significantly moderated an individual’s experience of religious doubt. Low avoidant attachment to God (i.e., a more secure attachment) was associated with a more negative relationship between cognitive religious doubt and positive mental health than high avoidant attachment. In contrast, low avoidant attachment to God also ameliorated the positive relationship between affective religious doubt and mental health problems. Low anxious attachment was associated with a stronger negative relationship between both measures of religious doubt (i.e., cognitive and affective) and positive mental health. In addition, high soft quest weakened all four of the relationships between measures of religious doubt and mental health. High hard quest ameliorated the positive relationship between both measures of religious doubt and mental health problems. These results indicate that an individual’s attachment to God and the way an individual is oriented toward religion each play a role in the mental health outcomes associated with religious doubt.

scholarly journals Employee Behaviors toward Using and Saving Energy at Work. The Impact of Personality Traits

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3404
Author(s):  
Dawid Szostek
Keyword(s):  
Personality Traits ◽  
Energy Saving ◽  
Organizational Citizenship ◽  
Positive Relationship ◽  
Negative Relationship ◽  
Organizational Citizenship Behaviors ◽  
Equation Modeling ◽  
Future Research ◽  
Citizenship Behaviors ◽  
The Impact

The purpose of the article is to determine how personality traits (extraversion, neuroticism, conscientiousness, agreeableness and openness to experience) affect organizational citizenship behaviors for the environment (OCBE), especially in the context of energy saving. The purpose is also to verify the hypothesis that this impact is significantly moderated by individuals’ demographic characteristic (sex, age, length of service, work type and economic sector of employment). To achieve the purposes, a survey was conducted in 2020 on 454 working people from Poland. The analysis was based on structural equation modeling (SEM). The research model assumed that particular types of personality affect direct and indirect OCBEs, including energy-saving patterns. The model also included the aforementioned demographic characteristics of respondents. I proved that personality traits have a significant impact on direct and indirect organizational citizenship behaviors for the environment. In the case of direct OCBEs, the energy-saving items that were most significantly affected by employee personality were: I am a person who turns off my lights when leaving my office for any reason; I am a person who turns off the lights in a vacant room; I am a person who makes sure all of the lights are turned off if I am the last to leave. The strongest predicators were Neuroticism (negative relationship) and Agreeableness (positive relationship) for direct OCBE, but Extraversion (positive relationship) and Agreeableness (negative relationship) for indirect OCBE. The impact of an individual’s personality on OCBE was significantly moderated mainly for indirect behaviors. This applied to all the analyzed demographic variables, but it was stronger for women, employees aged up to 40 years, those with 10 years or more experience, office/clerical workers, and public sector employees. The article discusses the theoretical framework, research limitations, future research directions and practical implications.

scholarly journals Employees Perception of Training and Its Relationship with Organizational Commitment among the Employees Working at Saudi Industrial Development Fund

2017 ◽  
Vol 8 (2) ◽  
pp. 25 ◽  
Author(s):  
Mohammed S. Alamri ◽  
Thamir I. Al-Duhaim
Keyword(s):  
Organizational Commitment ◽  
Industrial Development ◽  
Affective Commitment ◽  
Positive Relationship ◽  
Negative Relationship ◽  
Simple Random Sample ◽  
Normative Commitment ◽  
Development Fund ◽  
Perceived Supervisor Support ◽  
Perceived Availability

The aim of this study is to examine employees perception of training provided by Saudi Industrial Development Fund (SIDF) and its relationship with organizational commitment. To achieve this aim, the study utilized a questionnaire consists of two validated, well established, international instruments: the first one is the perceived availability of training developed by Newman et al., (2011) and includes 22-item inventory that measures an individual on the training, the second instrument called commitment scale developed by Allen and Meyer, (1996) and includes 18-item inventory to identify a person’s commitment. This questionnaire has been distributed to a simple random sample consist of (200) employees of Saudi Industrial Development Fund. A total of (175) complete questionnaires has been received back at a response rate of (87%). After analyzing data and testing hypotheses, the main results of this study are:• There is a positive relationship between five training-related variables and affective commitment.• There is a positive relationship between two training-related variables (the perceived availability of training and perceived supervisor support for training) and two commitment-related variables (continuance and normative commitment).• There is a negative relationship between perceived co-worker support for training and two commitment-related variables (continuance and normative commitment).• There is no relationship between two training-related variables (the perceived benefits of training and motivation to learn) and two commitment-related variables (continuance and normative commitment).

The Macroeconomic Determinants and FDI: Evidence from 14 International Alliances

2021 ◽  
Vol 9 (2) ◽  
pp. 69-82
Author(s):  
Sujan Chandra Paul ◽  
Md Harun Or Rosid ◽  
Mohammad Rakibul Islam ◽  
Refat Ferdous
Keyword(s):  
Unemployment Rate ◽  
Positive Relationship ◽  
Robust Regression ◽  
Negative Relationship ◽  
African Union ◽  
G7 Countries ◽  
Significant Positive Relationship ◽  
Brics Countries ◽  
Arab League ◽  
Asean Countries

This study investigates the relationship between Foreign Direct Investment (FDI) and some macroeconomic variables such as Gross Domestic Product (GDP), Gross Capital Formation (GCF), Agriculture, Forestry, and Fishing (AFF), Industry, Import, Export, Inflation and Unemployment rate. Panel Data of 14 regional alliances countries from 1990-2018 were collected from The World Bank website. Robust regression models are used in this study. This research found that GDP had significant positive relationship with FDI in all regions except Arab League, EU and G7 countries. GCF had significant positive relationship with FDI in Arab League, BRI, GATT, NAFTA countries & negative relationship in APEC, G7 countries. AFF had significant positive relationship with FDI in BRICS, GATT countries & negative relationship in African Union, ASEAN, BIMSTEC, BRI, BRICS, SAFTA countries. Industry had significant positive relationship with FDI in African Union, BRI, NAFTA, OECD countries and negative relationship in BRICS, G7, G20 countries. Import had significant positive relationship with FDI in African Union, APEC, Arab League, ASIAN, BRI, G7, G20, GATT countries and negative relationship in BRICS countries. Export had significant positive relationship with FDI in BRICS countries and negative relationship in African Union, ASEAN, BRI, G20, GATT, OECD, SAFTA countries. Inflation had significant positive relationship with FDI in GATT, SAFTA countries and negative relationship in African Union, APEC countries. Unemployment rate had significant positive relationship with FDI in African Union, BRI, BRICS, EU, G20, GATT, OECD, SAFTA countries and negative relationship in ASEAN countries.

Do CEO Political Connections and Firm Social Responsibility Affect Debt Level?

2020 ◽  
Vol 2 (2) ◽  
pp. 17-34
Author(s):  
Mohamed Ali Azouzi
Keyword(s):  
Social Responsibility ◽  
Positive Relationship ◽  
Negative Relationship ◽  
Political Connections ◽  
Political Connection ◽  
External Funding ◽  
Debt Level ◽  
The Social ◽  
Corporate Social ◽  
Selection Of

The objective of this study was to describe the effect of CEO political connection and firm social responsibility on debt access. These constructions have been evaluated in Tunisian firms. The results showed the presence of a positive relationship between political connection, corporate social responsibility, and the debt level. The authors also verified the presence of a negative relationship between political connection and the social responsibility of Tunisian companies. This research has shown how political connection and social responsibility improve the image of the company and facilitate their access to external funding methods. Tunisian companies are advised to know the importance of political connection and social responsibility in the selection of their leaders.

scholarly journals Increasing water temperatures exacerbate the potential for density dependence in juvenile steelhead

2018 ◽  
Vol 75 (6) ◽  
pp. 897-907 ◽  
Author(s):  
Knut Marius Myrvold ◽  
Brian Patrick Kennedy
Keyword(s):  
Density Dependence ◽  
Water Temperature ◽  
Positive Relationship ◽  
Local Population ◽  
Negative Relationship ◽  
Skewed Distribution ◽  
Energetic Cost ◽  
Size Distributions ◽  
Local Densities ◽  
A1b Scenario

We studied the potential effects of predicted climate change on the energetic demands of juvenile steelhead (Oncorhynchus mykiss) and their consequences for local population size and structure in Idaho, USA. Projected increases in water temperature incurred on average a 10% higher energetic cost by 2040 (range 7.0%–12.5% among study reaches in the watershed) and a 16% increase (range 8.5%–21.3%) by 2080 following the A1B scenario. The predicted increase in energetic cost was largest in the coolest stream reaches, where the proportional increases in energetic cost exceed that of temperature. Energetically, and in absence of increases in food supply, local densities were consequently expected to decline. We examined which factors best described the shape of current size distributions to explore future size distributions as temperatures increase. Mass distribution skewness was best explained by local biomass (positive relationship) and water temperature (negative relationship). The results suggest that local steelhead cohorts will approach a platykurtic, slightly negatively skewed distribution with increasing temperatures and demonstrate that temperature can exacerbate demographic density dependence in fish populations.

scholarly journals Model of Thailand Speech Intelligibility (T-SI) in the Large Classrooms from Public University

2017 ◽  
Vol 13 (7) ◽  
pp. 69
Author(s):  
Pasit Leeniva ◽  
Prapatpong Upala
Keyword(s):  
Speech Intelligibility ◽  
Positive Relationship ◽  
Negative Relationship ◽  
Public University ◽  
Spatial Component ◽  
Surface Areas ◽  
Transmission Index ◽  
Large Classrooms ◽  
Si Model ◽  
Relationship Of

The objectives of this research are to evaluate acoustic environments and to forecast STI values from spatial component variables in the large classrooms of the Thai public university that were specially controlled the same room finishing materials including the floor, walls, and ceiling. Whereas the five spatial component factors included (1) Room Volume (RV), (2) Ceiling Height (CH), (3) the Ratio of Depth to Width (Rdw), (4) Total Room Surface (TS), and (5) Percentage of Absorbing Surface areas (PAS). The research tools were the smartphones that used the applications for acoustical evaluation and speech intelligibility analysis. The Speech Transmission Index (STI), Reverberation Time (RT), and Background Noise Level (BNL) were collected by the calibrated microphone in the nine points distributed across the entire room. And also, the sounds for testing were simulated such as balloon burst, and STIPA signal via a sound generator. The Thailand Speech Intelligibility (T-SI) model was developed by the multiple regression analysis with a statistical at a confidence level of 95%.The results showed that this T-SI model depended on the strongly positive relationship of PAS and the slightly positive relationship of CH, TS while the RV, Rdw were slightly the negative relationship and which predicted STI values. Moreover, the highest affecting variable of T-SI model was CH and the lowest was PAS. However, this research implies that the improving room acoustic quality would be adjusting the sound absorbing surface areas i.e., increase the cloth curtain or appropriate methods.

scholarly journals Foreign Exchange Exposure and Hedging of Turkish Companies: Panel Data Evidence

2016 ◽  
Vol 9 (6) ◽  
pp. 44
Author(s):  
Mahmut Erdogan
Keyword(s):  
Panel Data ◽  
Foreign Exchange ◽  
Positive Relationship ◽  
Negative Relationship ◽  
Empirical Support ◽  
Turnover Ratio ◽  
Time Horizons ◽  
Short Run ◽  
Asset Turnover ◽  
Foreign Exchange Exposure

<p>This study investigates the foreign exchange exposure and determinants of risk for different time horizons of Turkish companies from 1997 to 2011. In order to analyze the effect of the 2001 crisis, the study is split into two sub-periods: pre-crisis, and post-crisis. The empirical findings of the study suggest a negative relationship between exposure and asset turnover ratio, and profit margin, while there was a positive relationship between exposure and leverage. The study also provides empirical support for the fact that the companies with a higher export rate are exposed to higher risk. Finally, large companies are subject to less risk in the short run.</p>

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