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Abstract

The aim of the study was to assess the feasibility of utilizing sodium alginate biopolymer as animmobilization carrier for laccase in the removal of indigo carmine (IC), an anionic dye. The main goal of this work was to optimize the decolourization process by selecting the appropriate immobilized enzyme dose per 1 mg of dye, as well as the process temperature. The effective immobilization of laccase using sodium alginate as a carrier was confirmed by Raman spectroscopy. An analysis of the size and geometric parameters of the alginate beads was also carried out. Tests of IC decolourization using alginate-laccase beads were conducted. Applying the most effective dose of the enzyme (320 mg of enzyme/1 mg of IC) made it possible to remove 92.5% of the dye over 40 days. The optimal temperature for the IC decolourization process, using laccase immobilized on sodium alginate, was established at 30-40ºC. The obtained results indicate that laccase from Trametes versicolor immobilized on sodium alginate was capable of decolourizing the tested dye primarily based on mechanism of biocatalysis.
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Bibliography

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Authors and Affiliations

Małgorzata Białowąs
1
ORCID: ORCID
Beata Kończak
1
Stanisław Chałupnik
1
Joanna Kalka
2
Magdalena Cempa
1
ORCID: ORCID

  1. Central Mining Institute – National Research Institute, Katowice, Poland
  2. Environmental Biotechnology Department, Faculty of Energy and Environmental Engineering,The Silesian University of Technology, Poland
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Abstract

B a c k g r o u n d: A novel paradigm of diastolic heart failure with preserved ejection fraction (HFpEF) proposed the induction of coronary microvascular dysfunction by HFpEF comorbidities via a systemic pro-infl ammatory state and associated oxidative stress. Th e consequent nitric oxide deficiency would increase diastolic tension and favor fi brosis of adjacent myocardium, which implies not only left ventricular (LV), but all-chamber myocardial stiff ening. Our aim was to assess relations between low-grade chronic systemic infl ammation and left atrial (LA) pressure-volume relations in real-world HFpEF patients.

Me t h o d s: We retrospectively analyzed medical records of 60 clinically stable HpEFF patients in sinus rhythm with assayed high-sensitive C-reactive protein (CRP) during the index hospitalization. Subjects with CRP >10 mg/L or coexistent diseases, including coronary artery disease, were excluded. LV and LA diameters and mitral E/E’ ratio (an index of LA pressure) were extracted from routine echocardiographic 46 Cyrus M. Sani, Elahn P.L. Pogue, et al. records. A surrogate measure of LA stiff ness was computed as the averaged mitral E/e’ ratio divided by LA diameter.

R e s u l t s: With ascending CRP tertiles, we observed trends for elevated mitral E/e’ ratio (p <0.001), increased relative LV wall thickness (p = 0.01) and higher NYHA functional class (p = 0.02). Th e LA stiffness estimate and log-transformed CRP levels (log-CRP) were interrelated (r = 0.38, p = 0.003). On multivariate analysis, the LA stiff ness index was independently associated with log-CRP (β ± SEM: 0.21 ± 0.07, p = 0.007) and age (β ± SEM: 0.16 ± 0.07, p = 0.03), which was maintained upon adjustment for LV mass index and relative LV wall thickness.

C o n c l u s i o n s: Low-grade chronic infl ammation may contribute to LA stiff ening additively to age and regardless of the magnitude of associated LV hypertrophy and concentricity. LA stiff ening can exacerbate symptoms of congestion in HFpEF jointly with LV remodeling.

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Authors and Affiliations

Cyrus M. Sani
Elahn P.L. Pogue
Joanna B. Hrabia
Alexander G. Zayachkowski
Magdaline M. Zawadka
Adrian G. Poniatowski
Dorota Długosz
Wiktoria Leśniak
Olga Kruszelnicka
Bernadeta Chyrchel
Andrzej Surdacki
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Abstract

Industry 4.0 and the associated idea of society 4.0 pose specific challenges for the concept of sustainable development. These challenges relate, inter alia, to responsibility, in which the changes to date have overall entailed:

• a transition from ex post responsibility to ex ante responsibility (H. Jonas);

• a transition from individual responsibility to corporate social responsibility.

In the context of society 4.0 there is a need for shared responsibility. The problem of justice and therefore the implementation of sustainable development not only becomes an open problem, but also requires constant updating and specifi c optimisation.

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Authors and Affiliations

Andrzej Kiepas
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Abstract

The article focuses, with a comparative perspective, on the economic reforms that were implemented in Germany during and after the unification in 1990. The fact is stressed that after the collapse of communism, most politicians and economists considered neoliberal reforms based on deregulation, liberalization and privatization as the only viable model. Although the reforms in East Gemany were not labelled as such, they amounted to a „shock therapy“, much like in neighboring Poland. The result of the radical and hasty liberalization and privatization, in combination with the currency union of Juli 1990, was the closure of many factories and mass unemployment. The government tried to compensate the losers of the transformation with welfare payments, but that resulted in a systemic crisis of united Germany, leading eventually to a second round of neoliberal reforms under the center-left coalition government under Chancellor Gerhard Schröder from 2001 to 2005. The widening social gaps and the fear of social dislocation eventually contributed to the rise of right-wing populist parties in Germany.

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Authors and Affiliations

Philipp Ther
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Abstract

Controlling the bubble size is a major concern in enhancing transport performance in gas-liquid systems. The role of wettability of diffuser surface on bubble size is the subject of the current work. The study inspects the contact angle of a set of liquids on HP ceramic diffusers using the Washburn method. The results demonstrate that organic liquids like toluene, methanol–water (1:1 v/v), ethanol– water (1:1 v/v) and decane have small contact angles of 12.9°, 37.5°, 24.4° and 22.5° respectively. Water has a lower wettability than the organic compounds where the contact angle was about 67.4°. The effect of wettability of the bubble size is investigated by measuring the size of air bubble produced using the same diffuser material. The results of bubble size measurement demonstrates that with liquids of small contact angle, i.e. good wetting properties, small bubble sizes are produced in comparison with liquids with a higher contact angle. The study demonstrates the viability of Washburn method in characterization of wettability of porous diffuser, which was verified by measuring the bubble size produced. A high reduction in bubble size can be obtained by a carefully chosen diffuser material that provides better wettability.
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Authors and Affiliations

Atheer M.G. Al-Yaqoobi
1
William B. Zimmerman
2

  1. Chemical Engineering Department, College of Engineering, University of Baghdad, Baghdad, Al-jadriya, Iraq
  2. Department of Chemical and Biological Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK

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