scholarly journals Rheological and Biophysical Properties of Living Fluids Under Shear: Active Suspensions of Synechocystis sp. CPCC 534

2021 ◽  
Author(s):  
Malih Mehdizadeh-Allaf ◽  
Zahra Habibi ◽  
John De Bruyn ◽  
Christopher T. DeGroot ◽  
Hassan Peerhossaini
Keyword(s):  
Molecular Diffusion ◽  
Positive Impact ◽  
Hard Spheres ◽  
Value Added ◽  
Active Suspensions ◽  
Shear Rates ◽  
Noticeable Increase ◽  
Dilute Suspensions ◽  
The One ◽  
Synechocystis Sp

Abstract In this study, we focus on the response of biological, rheological, and physical properties of dilute suspensions of cyanobacterium Synechocystis sp. CPCC534 to shear induced by stirring. Experiments were carried out at three different stirring rates in well-controlled conditions and the results are compared with stationary conditions where only molecular diffusion and cell motility govern the transport phenomena and cell growth. Our results show that the growth, biomass, total chlorophyll, and carotenoid production of Synechocystis sp. under various shear conditions were improved significantly, and the yield was nearly doubled. The viscosity of Synechocystis suspensions, subjected to different shear rates, was also measured. The data showed Newtonian behavior for suspensions at different cell concentrations. Cell concentration showed a noticeable increase in the viscosity of suspensions. However, we observed that this increase was smaller than the one predicted for a suspension of hard spheres. Addition of shear to the cyanobacterium Synechocystis sp. culture demonstrated a positive impact on the production of value-added products from the microorganism. The obtained results can be used to improve the bioreactor design for better productivity.

Physical and Rheological Properties of Active Fluids Under Shear Stress: Suspensions of Synechocystis

2020 ◽  
Author(s):  
Malihe Mehdizadeh Allaf ◽  
Zahra Habibi ◽  
Zahra Samadi ◽  
Christopher T. DeGroot ◽  
Lars Rehmann ◽  
...  
Keyword(s):  
Shear Stress ◽  
Rheological Properties ◽  
Molecular Diffusion ◽  
Volume Fraction ◽  
Transport Phenomena ◽  
Viscosity Data ◽  
Fluid Viscosity ◽  
History Of ◽  
Dilute Suspensions ◽  
Synechocystis Sp

Abstract Design of photobioreactors (PBRs) for microalgae and cyanobacteria cultivation involves the interplay between fluid flow, microbe biokinetics, and radiative transport phenomena, in which the physical and rheological properties of the active fluid play a crucial role. In this study, we focus on the variation of physical and rheological properties of dilute suspensions of Synechocystis sp. CPCC534 with the shear stress applied to the fluid. Experiments were carried out at three different stirring rates in well-controlled conditions and the results were compared with stationary conditions where only molecular diffusion and cell motility govern the transport phenomena, and cell growth. Our results show that the growth and biomass production of Synechocystis sp. under various shear conditions were improved significantly, and the yield was nearly doubled by adding agitation to the system. The viscosity of Synechocystis suspensions, subjected to different shear stress levels, was measured with two different methods. The viscosity data showed shear stress independent Newtonian behavior. However, the viscosity of Synechocystis suspensions increased moderately with cell volume fraction up to 10%, beyond which it increased more rapidly. The shear stress history of the cell suspensions did not show any effect on the fluid viscosity.

Static and Dynamic Studies of Gasoline in View of its Octane Number and its Toxic Effect

2013 ◽  
Vol 12 (7) ◽  
pp. 451-459
Author(s):  
Ashraf Yehia El-Naggar ◽  
Mohamed A. Ebiad
Keyword(s):  
Toxic Effect ◽  
Aromatic Hydrocarbons ◽  
Octane Number ◽  
Liquid Fuel ◽  
Positive Impact ◽  
Hydrocarbon Composition ◽  
Different Temperatures ◽  
Different Seasons ◽  
The One ◽  
The Impact

Gasoline come primarily from petroleum cuts, it is the preferred liquid fuel in our lives. Two gasoline samples of octane numbers 91 and 95 from Saudi Arabia petrol stations were studied. This study was achieved at three different temperatures 20oC, 30oC and 50oC representing the change in temperatures of the different seasons of the year. Both the evaporated gases of light aromatic hydrocarbons (BTEX) of gasoline samples inside the tank were subjected to analyze qualitatively and quantitatively via capillary gas chromatography. The detailed hydrocarbon composition and the octane number of the studied gasoline samples were determined using detailed hydrocarbon analyzer. The idea of research is indicating the impact of light aromatic compounds in gasoline on the toxic effect of human and environment on the one hand, and on octane number of gasoline on the other hand. Although the value of octane number will be reduced but this will have a positive impact on the environment as a way to produce clean fuel.

AN ANALYSIS OF THE EU’S INVESTMENT POLICY AFTER CETA: EFFECTS ON THE BULGARIAN ECONOMY

2020 ◽  
Author(s):  
Nikolay Marin ◽  
◽  
Mariya Paskaleva ◽  
Keyword(s):  
Bilateral Trade ◽  
Positive Impact ◽  
Value Added ◽  
Trade Agreement ◽  
Trade Agreements ◽  
Investment Policy ◽  
National Parliaments ◽  
Total Employment ◽  
Investment Protection ◽  
New Generation

In this paper we analyze the changes of the EU’s investment policy provoked by the mixed trade agreements. The EU’s investment policy has turned towards attaining bilateral trade agreements. One of these “new-generation” agreements is the Comprehensive Economic and Trade Agreement (CETA). It is in a process of being ratified by the national parliaments of the EU members. This study is focused on the general characteristics of CETA and the eventual problems posed by its regulatory and wide-ranging nature. We prove that the significance of this agreement pertains not only to the economic influence, that it will have on the European and Canadian economies, but CETA is also the first trade agreement to have been negotiated with a focus on investment protection and a change in the EU’s investment policy. The current study reveals the influence arising from the conclusion of CETA on the Bulgarian economy with an emphasis on electronic industry, machinery industry and manufacturing. We estimate both – the direct and indirect effects on Bulgaria’s exports, imports, value added and employment. In order to estimate the influence, we apply the multi-regional input-output model. It is proved that CETA will have a low but positive impact on the Bulgarian economy. After constructing different scenarios of development, we prove that the influence of CETA on the Bulgarian economy will amount to 0.010% GDP. The average total employment will be increased by more than 172 jobs in Bulgaria, which in turn, relative to the labor market, represents less than 0.01% of the total employment.

scholarly journals The Intra-EU Value Chain: An Approach to Its Economic Dimension and Environmental Impact

Economies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 54
Author(s):  
Óscar Rodil-Marzábal ◽  
Hugo Campos-Romero
Keyword(s):  
Environmental Impact ◽  
Co2 Emissions ◽  
Value Chain ◽  
Positive Impact ◽  
Value Added ◽  
Kuznets Curve ◽  
Output Analysis ◽  
Economic Dimension ◽  
Development Levels ◽  
European Economies

This paper aims to analyze the economic dimension and environmental impact of intra-EU value-added generation linked to global value chains (GVCs) through input-output analysis. For this purpose, information has been collected from TiVA (Trade in Value Added, OECD) and Eora databases for the years 2005 and 2015. From an economic perspective, the results point to a strengthening of the value-added generated within Factory Europe. From an environmental perspective, all EU28 members have reduced their exports-related impacts in intensity-emissions terms, but not all of them in the same degree. An approach to the environmental Kuznets curve (EKC) has also been carried out through a panel data model. The results show a positive impact of the participation in intra-EU value chain (Factory Europe) on CO2 emissions per capita. Further, an inverted U-shaped curve for CO2 emissions is found for the period 2005–15. In this sense, European economies with lower development levels (many Eastern and Southern countries) seem to be still on the rising segment of the curve, while the more developed ones seem to be on the decreasing segment. These results highlight the need to design global monitoring and prevention mechanisms to tackle growing environmental challenges and the need to incorporate specific actions associated with the GVCs activity.

scholarly journals Recovery of Anthocyanins and Monosaccharides from Grape Marc Extract by Nanofiltration Membranes

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 2003
Author(s):  
Paul Muñoz ◽  
Karla Pérez ◽  
Alfredo Cassano ◽  
René Ruby-Figueroa
Keyword(s):  
Functional Foods ◽  
General Trend ◽  
Value Added ◽  
Operating Conditions ◽  
Permeate Flux ◽  
Ultrasound Assisted Extraction ◽  
Grape Marc ◽  
Assisted Extraction ◽  
The One ◽  
By Products

Wastewaters and by-products generated in the winemaking process are important and inexpensive sources of value-added compounds that can be potentially reused for the development of new products of commercial interest (i.e., functional foods). This research was undertaken in order to evaluate the potential of nanofiltration (NF) membranes in the recovery of anthocyanins and monosaccharides from a clarified Carménère grape marc obtained through a combination of ultrasound-assisted extraction and microfiltration. Three different flat-sheet nanofiltration (NF) membranes, covering the range of molecular weight cut-off (MWCO) from 150 to 800 Da, were evaluated for their productivity as well as for their rejection towards anthocyanins (malvidin-3-O-glucoside, malvidin 3-(acetyl)-glucoside, and malvidin 3-(coumaroyl)-glucoside) and sugars (glucose and fructose) in selected operating conditions. The selected membranes showed differences in their performance in terms of permeate flux and rejection of target compounds. The NFX membrane, with the lowest MWCO (150–300 Da), showed a lower flux decay in comparison to the other investigated membranes. All the membranes showed rejection higher than 99.42% for the quantified anthocyanins. Regarding sugars rejection, the NFX membrane showed the highest rejection for glucose and fructose (100 and 92.60%, respectively), whereas the NFW membrane (MWCO 300–500 Da) was the one with the lowest rejection for these compounds (80.57 and 71.62%, respectively). As a general trend, the tested membranes did not show a preferential rejection of anthocyanins over sugars. Therefore, all tested membranes were suitable for concentration purposes.

Intellectual capital and performance of listed companies: empirical evidence from Italy

2014 ◽  
Vol 18 (1) ◽  
pp. 22-35 ◽  
Author(s):  
Domenico Celenza ◽  
Fabrizio Rossi
Keyword(s):  
Explanatory Power ◽  
Value Added ◽  
Listed Companies ◽  
Cross Sectional ◽  
Content Type ◽  
Accounting Performance ◽  
And Performance ◽  
The One ◽  
Two Stages ◽  
The Relationship

Purpose – The aim of this paper is to investigate the relationship between corporate performance and Value Added Intellectual Coefficient (VAICTM) on the one hand, and the relationship between the variations in market value and the variations in VAIC on the other hand. Design/methodology/approach – Starting from the VAIC model, 23 Italian listed companies were examined with the aim of investigating the relationship between VAIC and the performance of the firms in the sample. The analysis was divided into two stages. In the first stage, eight models of linear regression were estimated to verify the presence of a positive and statistically significant relationship between M/BV and VAIC and between accounting performance indicators (ROE, ROI, ROS) and the VAIC. In the second stage, six other models were tested, considering as an independent variable the variations in VAIC and the variations in profitability indicators. Findings – The outcomes of the application stress the importance of VAIC in the explanation of the variations in MV and its role as “additional coefficient” in the analysis of equity performance. Originality/value – This methodology highlights some very interesting aspects. In particular, whereas the relationship between M/BV and VAIC and between profitability indicators (ROI, ROE, ROS) and VAIC is statistically insignificant, the subsequent analysis highlights the importance of VAIC as a variable capable of increasing the explanatory power of the regression in a cross-sectional perspective.

Intellectual Capital Investment, Stakeholders' Value, Firm Market Value and Financial Performance: The Case of Tunisia Stock Exchange

2013 ◽  
Vol 12 (02) ◽  
pp. 1350010 ◽  
Author(s):  
Hedia Fourati ◽  
Habib Affes
Keyword(s):  
Human Capital ◽  
Financial Performance ◽  
Intellectual Capital ◽  
Capital Investment ◽  
Positive Impact ◽  
Stock Exchange ◽  
Value Added ◽  
Market Value ◽  
Market Valuation ◽  
Using Data

The purpose of this paper is to investigate the role of intellectual capital investment in improving the firm's market value, stakeholders' value and financial performance. Using data drawn from 21 listed companies in Tunisia Stock Exchange, we conducted two studies. On one hand, from using Charreaux (Charreaux (2006). La valeur partenariale: Vers une mesure opérationnelle. Cahier de FARGO no. 1061103, November) measure of stakeholders' value, we demonstrate that financials come to present the weakest stakeholders' value and clients monopolises in term of value acquisition due to a weak ability of negotiation of firms. On the other hand, we construct a regression model of Pulic's value added intellectual capital investment (VAIC) as the measure of the value added from intellectual capital, in market valuation and financial performance. Our results stressed the fact that there is a positive impact of intellectual capital by human capital efficiency and capital employed efficiency on improving firm's market value. Nevertheless, financial performance measured by ROA is still justified by the traditional measure relying on capital employed efficiency. Indeed for Tunisian quoted firms, human capital investment is a pilar for ameliorating firm market valuation of financial performance.

scholarly journals Preparation of Whey-Based Banana Beverage and its Quality Evaluation

2021 ◽  
Vol 5 (01) ◽  
pp. 60-66
Author(s):  
Kunjal Shrestha ◽  
Abhishek Dahal
Keyword(s):  
Sensory Analysis ◽  
Room Temperature ◽  
Storage Time ◽  
Value Added ◽  
Body Color ◽  
Overall Acceptability ◽  
A Value ◽  
Banana Juice ◽  
Nutritional Qualities ◽  
The One

A value-added functional beverage was formulated utilizing unprocessed whey with excellent nutritional qualities and bland flavors; along with banana juice and the required amount of sugar. Five different formulations were prepared with varying proportions of whey, banana juice, and sugar. Sensory analysis was carried out for all five formulations and based on statistical analysis the one which showed the highest value for body, color, flavor, taste, and overall acceptability was selected for further analysis (85% liquid whey and 15% banana juice). The shelf-life of the final product was observed for 30 days at room temperature (25±5°C) and refrigerated temperature (7±1ºC). A significant variation in body, color, flavor, taste, and overall acceptability were observed by varying the composition of whey and banana juice (p<0.05). The beverage was pasteurized at 82.5°C for 20 min and stored at normal (25±5°C) and refrigerated (7±1°C) for 30 days. The effects of storage time and temperature on physicochemical (TSS, pH, acidity) and microbial (TPC, yeast & mold count) properties were evaluated. Out of five formulations, the one selected via sensory analysis had TSS of 12.4°Bx, total solids 14.21%, 0.302% acidity, pH 5.72, 5.087% reducing sugar, 0.53% protein, 0.56% ash, 0.87% crude fiber, 184.43mg potassium (mg/100gm) and 0.912mg vitamin C in 100 ml. The prepared beverage was stored for 30 days under refrigerated and normal conditions, and changes in TSS, pH and acidity were observed: 12.413.3%, 5.72-5.214, 0.32-0.43%, and 12.4-13.8%, 5.72-4.64, 0.32-0.68% respectively. Overall analysis showed that the beverage prepared with 85% liquid whey and 15% banana juice could be stored for 30 days under refrigerated conditions without the addition of preservatives.

scholarly journals Legal-economic barriers to price transfers in food supply chains

2012 ◽  
Vol 6 (1-2) ◽  
pp. 27-33 ◽  
Author(s):  
Harry Bremmers ◽  
Bernd Van der Meulen ◽  
Zorica Sredojevi ◽  
Jo Wijnands
Keyword(s):  
Supply Chain ◽  
Supply Chains ◽  
Food Supply ◽  
Value Added ◽  
Price Volatility ◽  
Retail Sector ◽  
The European Union ◽  
Food Supply Chains ◽  
Industry Policy ◽  
The One

Recent price movements have put food supply chains under pressure. On the one side, upward price tendencies on commodity markets result in higher costs to processing firms. On the other side, these firms are confronted with a strong retail sector that is able to prevent compensation to protect consumers’ and own economic interests. Regulatory impediments of European law, especially with respect to foodstuffs, can adversely be utilized as barriers to protect the interest downstream the supply chain. The problem is that legal-economic instruments which can serve to smooth price volatility in supply markets can also opportunistically be used at the expense of the middlesection in food supply chains (i.e., mainly small and medium sized producers). The aim of this article is to identify the legal-economic mechanisms that effect price transfers in food supply chains in the European Union and define policy adjustments to improve pricing mechanisms, while safeguarding the interests of the processing industry. Policy alternatives to improve the smooth functioning of notably intermediate markets in food supply chains are the restructuring of competition law, improved processor information management and creating transparency of value added in the supply chain by means of labelling devices.

scholarly journals Fruit production and quality of mini-watermelon with different number of stems, in troughs cultivation system and substrate reuse

2021 ◽  
Vol 42 (2) ◽  
pp. 471-486
Author(s):  
Josiéle Garcia Dutra ◽  
◽  
Roberta Marins Nogueira Peil ◽  
Tatiana da Silva Duarte ◽  
Cesar Valmor Rombaldi ◽  
...  
Keyword(s):  
Fruit Quality ◽  
Positive Impact ◽  
Fruit Weight ◽  
Fruit Yield ◽  
Soluble Solids ◽  
Plant Management ◽  
Cultivation System ◽  
Fruit Number ◽  
Yield And Quality ◽  
The One

Substrate-filled pots are growing systems commonly used for vegetable farming. However, few are the studies available relating them to mini-watermelon cultivation. Our study presents a growing system using substrate-filled troughs and leachate recirculation as a low-cost and less environmentally harmful soilless cultivation system for mini-watermelons. For a growing system to be viable and provide high fruit yield and quality, several aspects must be studied, including substrate physical properties and reuse potential in successive crops, besides plant management-related aspects. Therefore, our goal was to evaluate the effects of a trough system and substrate reuse on changes in the properties of raw rice husk and on fruit yield and quality for mini-watermelons at different stem training. To this purpose, two trials were conducted using nutrient solution recirculation systems. In the first, we evaluated the effects of pot and trough systems. In the second, first- and second-use substrates were compared in the trough system. In both trials, one and two-stem training systems were analyzed. The results of the first trial show that the trough system had a greater positive impact on substrate water holding capacity (WHC), which increased from 7.9 to 15.6%, while the pots increased substrate WHC only to 11.2%. However, both systems neither affected fruit yield (8 kg/m² on average) nor fruit quality. The two-stem training promoted higher fruit yields (4.2 kg/plant) and contents of total soluble solids - TSS (11.4 °Brix) but did not affect average fruit weight. Moreover, the one-stem training provided higher fruit number (7.3 fruits/m²) and fruit yield (9.7 kg/m²). In the second trial, the reused substrate showed a higher WHC (12.4%) than the one used for the first time (9.9%). The reused substrate also provided better results in terms of fruit yield and quality (5.9 fruits/m², 5.3 kg/m², and 10.5o Brix). In the second trial, two-stem training also increased average fruit weight, and hence yields per plant. Nevertheless, the stem number did not affect fruit number per plant, fruit yield per square meter, and fruit quality.

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