scholarly journals Performance Comparison of Eichhornia crassipes and Salvinia natans on Azo-Dye (Eriochrome Black T) Phytoremediation

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 565 ◽  
Author(s):  
Eszter Rápó ◽  
Katalin Posta ◽  
Alexandra Csavdári ◽  
Boglárka Éva Vincze ◽  
Gyöngyvér Mara ◽  
...  
Keyword(s):  
Eichhornia Crassipes ◽  
Organic Dyes ◽  
Performance Comparison ◽  
Aqueous Environment ◽  
Toxic Stress ◽  
Stress Effects ◽  
Defense Enzyme ◽  
Eriochrome Black T ◽  
Negative Effect ◽  
Salvinia Natans

Organic pollutants, such as dyes, have a negative effect on the aqueous environment, therefore, their elimination from water bodies is a high priority. In this work, Eichhornia crassipes and Salvinia natans, both model plants with high phytoremediation efficiency, were exposed to various concentrations (Ci = 50–500 mg/L) of Eriochrome Black T (EBT). Their capacity to assimilate EBT was studied for 16 days of exposure, similar to natural conditions and by spectrophotometric monitoring of the dye concentration (EE. crassipes; 150 mg/L = 33%; ES. natans; 150 mg/L = 71.5%). The changes of the experimental parameters (pH—equalised by day 5, temperature, humidity, light intensity) were followed, and plant growth and biochemical responses to toxic stress effects (photosynthetic pigments, Energy-dispersive X-ray spectroscopy (EDX)—decreased effect of P, Mg, Ca, S and K, Scanning electron microscopy (SEM), defense enzyme) were examined. Furthermore, changes in oxidative- and photo-degradation of EBT in time and the solid-state properties (SEM, EDX, Fourier-transform infrared spectroscopy-FTIR) of the dye were investigated. Our results demonstrate that, despite the toxic stress, both species succeeded in reducing the dye-concentration of the water and S. natans proved to be more efficient in binding and removing organic dyes. With our findings, we proved that both plants alleviated the abiotic stress of dye contamination.

scholarly journals The Effect of Ionic Charge on the Adsorption of Organic Dyes onto Titanate Nanotubes

2010 ◽  
Vol 63 (2) ◽  
pp. 270 ◽  
Author(s):  
Dmitry V. Bavykin ◽  
Katherine E. Redmond ◽  
Benjamin P. Nias ◽  
Alexander N. Kulak ◽  
Frank C. Walsh
Keyword(s):  
Aqueous Solution ◽  
Organic Dyes ◽  
Dye Adsorption ◽  
Titanate Nanotubes ◽  
Charged Surface ◽  
Dye Molecules ◽  
Ionic Charge ◽  
Eriochrome Black T ◽  
Opposite Trend ◽  
Positively Charged

The adsorption of dye molecules from aqueous solution onto the surface of titanate nanotubes (which have been synthesized via an alkaline hydrothermal treatment) has been studied. The ionic charge on the dye molecules was found to affect their ability to adsorb onto the titanate nanotube surface. In the case of (cationic) methylene blue, the adsorption was preferable on the negatively charged surface of titanate nanotubes rather than on positively charged P25 TiO2 nanoparticles. In the case of (anionic) Eriochrome Black T dye, the opposite trend was found. Herein, the dynamics of dye adsorption and the effect of pH on the adsorption capacity are considered.

Positioning decisions within strategic groups

2014 ◽  
Vol 52 (10) ◽  
pp. 1858-1887 ◽  
Author(s):  
Xiao Duan ◽  
Zhan-ming Jin
Keyword(s):  
Firm Performance ◽  
Performance Comparison ◽  
Annual Reports ◽  
Corporate Diversification ◽  
Strategic Groups ◽  
Strategic Positioning ◽  
Strategic Group ◽  
Content Type ◽  
Two Factors ◽  
Negative Effect

Purpose – Strategic group has been intensively studied since this term emerged in 1970s, but previous studies have been limited to the comparisons between groups such as performance comparison. The purpose of this paper is to explore the internal structure of strategic groups by examining the effect of strategic distance from a firm to the center of its strategic group on firm performance. Design/methodology/approach – The research is based on data acquired from the annual reports of listed companies and some Chinese domestic databases, including CSMAR Solution, WIND financial database, and China Core Newspapers Full-text Database. After grouping listed pharmaceutical companies in China over the period 2010-2011, the authors test three hypotheses by using fixed effect regressions. Findings – The paper finds that the strategic distance from a firm to the center of its strategic group has a significant negative effect on the firm's financial performance. Two factors are discovered to influence that effect: corporate diversification strengthens the negative effect of strategic distance on performance, while firm's media visibility weakens that negative effect. Originality/value – The findings reveal the relationship between intra-group strategic positioning and firm performance, and specify how firms can gain competitive advantage through positioning choices and strategic actions. This study promotes the establishment of a more comprehensive strategic group theory by revealing the structure within strategic groups.

scholarly journals IDENTIFICATION OF MACROPHYTA IN THE SWAMP AREA OF THE SAWAH VILLAGE, KAMPAR REGENCY, RIAU PROVINCE

2020 ◽  
Vol 2 (2) ◽  
pp. 95-106
Author(s):  
Aprilia Safitri Nasution ◽  
Windarti Windarti ◽  
Efawani Efawani
Keyword(s):  
Eichhornia Crassipes ◽  
Colocasia Esculenta ◽  
Survey Method ◽  
Azolla Pinnata ◽  
Panicum Repens ◽  
Salvinia Natans

There were many types of macrophyta present in the swamp area of the Sawah Village, but there was no information about the types of macrophyta in that area. To understand the type of macrophyta presence in that area, a research has been carried out in February 2019. The method usedz is a the survey method, where the swanp area of the Sawah Village used as the location of the research and macrophytes as the object of research. Sampling was done once during the study. The plants were then identified based on Steenis (1981). There are 10 types of macrophytes found in the swanp area of the Sawah Village namely: Colocasia esculenta, Eichhornia crassipes, Eleocharis dulcis, Paspalum comersonii, Azolla pinnata, Utricularia aurea, Salvinia natans, Nepbrolepis biserrata, Monochoria vaginalis, Panicum repens.

Shade access in combination with sprinkling and ventilation effects performance of Holstein cows in early and late lactation

2019 ◽  
Vol 59 (2) ◽  
pp. 347 ◽  
Author(s):  
Lorena Román ◽  
Celmira Saravia ◽  
Laura Astigarraga ◽  
Oscar Bentancur ◽  
Alejandro La Manna
Keyword(s):  
Heat Stress ◽  
Block Design ◽  
Mitigation Strategies ◽  
Holstein Cows ◽  
Stress Effect ◽  
Early Lactation ◽  
Stress Effects ◽  
Negative Effect ◽  
Humidity Index ◽  
Two Stages

The negative effect of heat stress on dairy cows, with a temperature humidity index (THI) over 72, has been extensively studied. However, there are few studies on THI values under 72 that compare the effect of heat stress in different lactation stages. The objective of this study was to determine the heat stress effect on two lactation stages with a THI below the threshold 72. Thirty-nine multiparous, non-pregnant Holstein cows with more than 30 kg/cow.day of solid-corrected milk were used in a randomised complete block design to evaluate six treatments. The experimental design had a 3 by 2 factorial arrangement with three heat stress mitigation strategies: No shade (CON), access to shade only, and access to shade combined with sprinkling and ventilation, and two stages of lactation: early (S1) and late (S2), 12 ± 10.3 and 201 ± 45.8 days in milk respectively, for a duration of 81 consecutive days. All treatments, except CON had access to artificial shade from 0900 hours to 0500 hours next day. From 0500 hours to 0900 hours all cows were managed together in a grazing session. Additionally, sprinkling and ventilation cows had two 30-min sessions of ventilation and spray (0900 hours, 1530 hours). The average THI was 70.1 ± 4.46 (minimum THI: 60.4; maximum THI: 81.7) and the average hours above 72 were 7.8 ± 5.98. Animals in S1 presented higher solids-corrected milk reduction (P < 0.0001; 5.4 and 1.9 kg/cow.day), and protein yield (<0.0001; 0.13 and 0.54 kg/cow.day) than animals in S2 when shade was not allowed (CON). It was concluded that under these conditions, animal productivity is more negatively affected in early lactation animals. The use of shade with or without spray and ventilation mitigates heat stress effects on both stages of lactation.

scholarly journals Toxic Stress: Effects, Prevention and Treatment

Children ◽  
2014 ◽  
Vol 1 (3) ◽  
pp. 390-402 ◽  
Author(s):  
Hillary Franke
Keyword(s):  
Toxic Stress ◽  
Stress Effects ◽  
Prevention And Treatment

scholarly journals CFD Study of Diffuse Ceiling Ventilation through Perforated Ceiling Panels

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1995 ◽  
Author(s):  
Alessandro Nocente ◽  
Tufan Arslan ◽  
Steinar Grynning ◽  
Francesco Goia
Keyword(s):  
System Performance ◽  
Three Dimensional ◽  
General System ◽  
Performance Comparison ◽  
Air Distribution ◽  
Velocity Magnitude ◽  
Numerical Studies ◽  
Negative Effect ◽  
Office Rooms ◽  
Dimensional Domain

Diffuse Ceiling Ventilation (DCV) is a promising concept to address internal air quality and thermal comfort requirements in contemporary buildings. Sound-absorbing perforated ceiling panels are common in office rooms and can be used as air diffusers without modifications. The optimization of such systems is not a trivial procedure, and numerical simulation can represent an important tool to carry out this task. Today, most of the numerical studies on DCV are performed using porous medium models and focus on the general system performance rather than on the optimization of the diffuser design. In previous studies, a CFD model was used to optimize the size and distribution of the ceiling perforation. In the study presented in this paper, the results of simulations conducted on a full-scale three-dimensional domain and the performance comparison between a continuous and non-continuous perforation distribution are given. The results show that the non-continuous diffuser design does not disturb the internal comfort and does not introduce a negative effect in the system performance. The different configurations lead to a different air distribution in the room, but in both cases, the velocity magnitude is always well below values leading to draft discomfort.

scholarly journals ERM Implementation and Non-Performing Loans Performance: Comparison between Islamic Bank and Conventional Bank

2020 ◽  
Vol 1 (2) ◽  
pp. 49
Author(s):  
Kurnia Indah Sumunar ◽  
Dyah Ayu Anggraheni ◽  
Mutiara Kemala Ratu
Keyword(s):  
Stock Exchange ◽  
Performance Comparison ◽  
Islamic Banking ◽  
Long Time ◽  
Negative Effect ◽  
Conventional Banks ◽  
Different Characteristics ◽  
Further Development ◽  
Research Period ◽  
Test Level

There are different characteristics between islamic banking and conventional banking that cause a variety of questions, including the implementation of ERM. This study focuses on the effect of ERM implementation on NPL performance of banking, If the implementation of ERM is good, so the performance of NPL will also better. This study investigate the effect of ERM implementation on NPL performance on islamic banking and conventional banking. This study also investigate a different test level of ERM implementation that affect NPL on each type of banking. The sample consisted of 30 conventional banks listed on the Indonesia Stock Exchange and 10 Islamic banking based on the Islamic Banking Statistics that issued by Bank Indonesia for the 2011-2016 research period. This study find that the implementation of ERM has a significant negative effect both on the islamic banking and on conventional banking. While the results of different tests conducted show that the implementation of ERM to NPL has more influence on conventional banking than in islamic banking, this could be due to the maturity level of both types of banks. Conventional banking has also existed for a long time compared to Islamic, so it certainly has a functioning structure efficiently, but for Islamic banking still requires effort and improvement for further development.

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