Mechanisms of Tri-N-Butyltin Bioaccumulation by Marine Phytoplankton

1989 ◽  
Vol 46 (5) ◽  
pp. 859-862 ◽  
Author(s):  
Thomas C. Chiles ◽  
Peter D. Pendoley ◽  
Roy B. Laughlin Jr.
Keyword(s):  
Linear Relationship ◽  
Isochrysis Galbana ◽  
Competitive Binding ◽  
Marine Microalgae ◽  
Marine Phytoplankton ◽  
Chaetoceros Gracilis ◽  
Synechococcus Sp ◽  
The Relationship ◽  
Fold Excess

We examined uptake of tri-n-butyltin (TBT) by three genera of marine microalgae and one genus of cyanobacterium. There was a linear relationship between external concentrations of TBT and cell burdens in the microalgae Nannochloris sp., Chaetoceros gracilis, and the cyanobacterium Synechococcus sp. (PR-6). The relationship between external TBT concentrations and cell TBT burdens was distinctly nonlinear for Isochrysis galbana. Competitive binding experiments showed a decrease of approximately 88% of the total bound radiolabeled TBT to I. galbana in the presence of a 200-fold excess of unlabeled TBT. No significant decrease of bound TBT was observed for Nannochloris sp. These studies demonstrate that either partitioning or binding may control bioaccumulation of TBT by marine phytoplankton.

The Structural Stability of the Concentration-Performance Relationship in Food Manufacturing

1982 ◽  
Vol 14 (2) ◽  
pp. 43-49
Author(s):  
Stephen E. Miller
Keyword(s):  
Industrial Organization ◽  
Linear Relationship ◽  
Structural Stability ◽  
Market Performance ◽  
Continuous Linear ◽  
Food Manufacturing ◽  
The Relationship

The literature of industrial organization is replete with analyses of the relationship between seller concentration and market performance. Most researchers have hypothesized a continuous linear relationship between profitability and concentration and have estimated that relationship accordingly.

Marine microalgae culture: Chaetoceros gracilis with zeolitic product ZESTEC-56 and a commercial fertilizer as a nutrient

1995 ◽  
Vol 14 (4) ◽  
pp. 367-372 ◽  
Author(s):  
JoséL. López-Ruiz ◽  
Rocío García García ◽  
Maria Soledad ◽  
Ferreiro Almeda
Keyword(s):  
Marine Microalgae ◽  
Commercial Fertilizer ◽  
Microalgae Culture ◽  
Chaetoceros Gracilis

Measuring Strains for Hematite Phase in Sinter Ore by Electron Backscattering Diffraction Method

2006 ◽  
Vol 326-328 ◽  
pp. 237-240 ◽  
Author(s):  
Yasushi Sasaki ◽  
Manabu Iguchi ◽  
Mitsutaka Hino
Keyword(s):  
Linear Relationship ◽  
Strain Gauge ◽  
Diffraction Method ◽  
Local Strain ◽  
Electron Backscattering ◽  
Hematite Phase ◽  
Compression Strain ◽  
Electron Backscattering Diffraction ◽  
Ebsd Technique ◽  
The Relationship

Based on the relationship between quantified blurring degree of Kikuchi bands obtained by an electron backscattering diffraction (EBSD) technique and macroscopic strains measured by a strain gauge, the local compression strain SEBSD in sinter ore has been evaluated under various conditions. There is a good linear relationship between the SEBSD and the strains measured by a strain gauge. The local strain SEBSD evaluated by EBSD patterns can be used as an index of local strains.

LA MESURE DE L’INTERFÉRENCE DU CHIENDENT DANS L’ORGE

1982 ◽  
Vol 62 (1) ◽  
pp. 183-188 ◽  
Author(s):  
R. RIOUX
Keyword(s):  
Regression Analysis ◽  
Hordeum Vulgare ◽  
Linear Relationship ◽  
Linear Relation ◽  
Shoot Density ◽  
Yield Variability ◽  
Hordeum Vulgare L ◽  
The Mean ◽  
The Relationship ◽  
Agropyron Repens

Barley (Hordeum vulgare L. ’Champlain’) was grown with quackgrass (Agropyron repens (L.) Beauv.) at various densities for 3 yr. According to the regression analysis, a linear relation is appropriate to describe the relationship between yield of barley and biomass or density of quackgrass. A greater proportion of yield variability was explained by density (64%) than by biomass (40%). Density is then a better criterion than biomass to predict yield lost in barley. The linear relationship between barley yield and the shoot density of quackgrass is estimated by the following equation: yield barley = 345.3–0.5682 dens, quackgrass. An increase of 10 shoots/m2 in the mean density of quackgrass resulted in a mean loss of 6 g/m2 in the yield of barley.

scholarly journals Methods of Controlling Lift - off in Conductivity Invariance Phenomenon for Eddy Current Testing

2020 ◽  
Author(s):  
Zhongwen Jin ◽  
Yuwei Meng ◽  
Rongdong Yu ◽  
Ruochen Huang ◽  
Mingyang Lu ◽  
...  
Keyword(s):  
Linear Relationship ◽  
Eddy Current ◽  
Coating Thickness ◽  
Test Sample ◽  
Common Point ◽  
Coil Design ◽  
Current Testing ◽  
Lift Off ◽  
Two Parameters ◽  
The Relationship

<p>Previously, a conductivity invariance phenomena (CIP) has been discovered – at a certain lift-off, the inductance change of the sensor due to a test sample is immune to conductivity variations, i.e. the inductance – lift-off curve passes through a common point at a certain lift-off, termed as conductivity invariance lift-off. However, this conductivity invariance lift-off is fixed for a particular sensor setup, which is not convenient for various sample conditions. In this paper, we propose using two parameters in the coil design – the horizontal and vertical distances between the transmitter and the receiver to control the conductivity invariance lift-off. The relationship between these two parameters and the conductivity invariance lift-off is investigated by simulation and experiments and it has been found that there is an approximate linear relationship between these two parameters and the conductivity invariance lift-off. This is useful for applications where the measurements have restrictions on lift-off, e.g. uneven coating thickness which limits the range of the lift-off of probe during the measurements. Therefore, based on this relationship, it can be easier to adjust the configuration of the probe for a better inspection of the test samples.</p>

scholarly journals Hubungan Kepercayaan Diri Siswa dengan Pemahaman Konsep Matematis Siswa Kelas XI MIA 1 SMAN 3 Lubuk Basung Kabupaten Agam

Horizon ◽  
2021 ◽  
Vol 1 (4) ◽  
pp. 698-711
Author(s):  
Vuve Ona Rahma Suci ◽  
Melisa .Melisa ◽  
Hamdunah .Hamdunah
Keyword(s):  
Data Analysis ◽  
Linear Relationship ◽  
Regression Coefficient ◽  
Linear Regression Analysis ◽  
Positive Influence ◽  
Mathematical Concepts ◽  
Self Confidence ◽  
Analysis Technique ◽  
The Relationship ◽  
Positive Effect

The ability to understand concepts is one of the goals of mathematical ability. One of the factors for the lack of ability to understand concepts is self-confidence. This study aims to determine the relationship between students' self-confidence and understanding of mathematical concepts in class XI MIA SMAN 3 Lubuk Basung Kabupaten Agam.This study uses inferential research where inferential research is a study that tests a hypothesis, and relates one variable to another with quantitative analysis. The subjects of this study were students of class XI MIA 1 SMAN 3 Lubuk Basung. The research instrument used was a self-confidence questionnaire and a test for understanding mathematical concepts. The data analysis technique used is simple linear regression analysis and product moment correlation.Based on data analysis, the regression coefficient of the questionnaire score (b) is with a significant level of 0.05 because the regression coefficient (b) is positive, so there is a positive effect of X on Y. It means that the bigger X, the bigger Y on average. The close linear relationship between X and Y can be seen from the correlation coefficient r = where r approaches 1, then a positive linear relationship between X and Y so that it can be concluded that the bigger X, the greater Y and self-confidence has a positive influence on the ability to understand concepts of class XI students. MIA 1 SMAN 3 Lubuk Basung Kabupaten Agam.

scholarly journals Welfare and the depth of informality: Evidence from five African countries

2021 ◽  
Author(s):  
Eva-Maria Egger ◽  
Cecilia Poggi ◽  
Héctor Rufrancos
Keyword(s):  
Panel Data ◽  
Linear Relationship ◽  
Social Insurance ◽  
Household Head ◽  
African Countries ◽  
Cross Sectional ◽  
Hours Worked ◽  
Household Level ◽  
Sub Saharan ◽  
The Relationship

This study explores the relationship between household poverty and depth of informality by proposing a new measure of informality at the household level. It is defined as the share of activities (hours worked or income earned) without social insurance for wage workers in the household. We apply cross-sectional regressions to five urban sub-Saharan African countries, showing that a household head informality dummy obscures a non-linear relationship between the depth of household informality and welfare outcomes. In some countries, a small share of income from formal jobs is associated with at least the same welfare as a fully formal portfolio. By assessing transitions between household portfolios with panel data for urban Nigeria, we also show that most welfare differences are explained by selection and that movements in and out of formality cannot sufficiently change welfare trajectories. The results call for better inclusion of informal profiles to social insurance programmes.

scholarly journals Crecimiento de las microalgas Chaetoceros gracilis e Isochrysis galbana con fertilizantes agrícolas, en laboratorio

2016 ◽  
pp. 44
Author(s):  
Rodolfo Patricio Panta Vélez ◽  
Ana Gabriela Macay García ◽  
Ermen Miguel Moncayo Zambrano ◽  
Juan Carlos Vélez Chica
Keyword(s):  
Isochrysis Galbana ◽  
Chaetoceros Gracilis ◽  
Palabras Clave

En el presente estudio se evalúa el crecimiento de dos especies de microalgas Chaetoceros gracilis e Isochrysis galbana, con dos tipos de fertilizantes agrícolas, en condiciones de laboratorio, con el propósito de  determinar la densidad celular (cel/mL), tasade crecimiento específica (divisiones/día) y tasa deduplicación (divisiones/día) de  cada especie. Los  bioensayos se realizaron en  tubos  de ensayos de 20 mL y botellas de 500 mL y 1 000 mL utilizando  el medio  de cultivo Guillard F/2 como control (T1) y los fertilizantes agrícolas Complefol -solución  Complefol 5 g/L (T2), y solución  Complefol 10 g/L (T3)- y Stimufol -solución  Stimufol 5 g/L (T4) y solución  10 g/L (T5)-, cada uno con tres réplicas. Durante el estudio no se observó diferencias significativas en las densidades celulares, no así  en la tasa de crecimiento específico y tiempo de duplicación en ambos cultivos de microalgas, mostrándose que las mayores densidades celulares, crecimiento específico y tasa de duplicación, se obtuvieron en el medio Guillard/F2, seguido del Stimufol, lo que demuestra que los fertilizantes agrícolas son una alternativa adecuada para  usarse en el cultivo de microalgas, en particular  el Stimufol, con mayores rendimientos en comparación con Complefol.  Palabras clave: Densidad celular, medios de cultivo, microalgas, tasa de crecimiento específica, tiempo de duplicación

scholarly journals Weather Prediction using Advanced Machine Learning Techniques

2021 ◽  
Vol 2089 (1) ◽  
pp. 012059
Author(s):  
G. Hemalatha ◽  
K. Srinivasa Rao ◽  
D. Arun Kumar
Keyword(s):  
Linear Relationship ◽  
Weather Prediction ◽  
Weather Condition ◽  
Weather Conditions ◽  
Machine Learning Techniques ◽  
Weather Data ◽  
Learning Techniques ◽  
Proposed Model ◽  
Non Linear ◽  
The Relationship

Abstract Prediction of weather condition is important to take efficient decisions. In general, the relationship between the input weather parameters and the output weather condition is non linear and predicting the weather conditions in non linear relationship posses challenging task. The traditional methods of weather prediction sometimes deviate in predicting the weather conditions due to non linear relationship between the input features and output condition. Motivated with this factor, we propose a neural networks based model for weather prediction. The superiority of the proposed model is tested with the weather data collected from Indian metrological Department (IMD). The performance of model is tested with various metrics..

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