scholarly journals Assessment of Voltage Influence in Carbon Dioxide Fixation Process by a Photo-Bioelectrochemical System under Photoheterotrophy

2021 ◽  
Vol 9 (3) ◽  
pp. 474
Author(s):  
Sara Díaz-Rullo Edreira ◽  
Silvia Barba ◽  
Ioanna A. Vasiliadou ◽  
Raúl Molina ◽  
Juan Antonio Melero ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Source ◽  
Future Development ◽  
Metabolic Pathways ◽  
Co2 Fixation ◽  
Oxygen Demand ◽  
Carbon Uptake ◽  
Bioelectrochemical System ◽  
Electron Sink ◽  
Soluble Carbon

Bioelectrochemical systems are a promising technology capable of reducing CO2 emissions, a renewable carbon source, using electroactive microorganisms for this purpose. Purple Phototrophic Bacteria (PPB) use their versatile metabolism to uptake external electrons from an electrode to fix CO2. In this work, the effect of the voltage (from −0.2 to −0.8 V vs. Ag/AgCl) on the metabolic CO2 fixation of a mixed culture of PPB under photoheterotrophic conditions during the oxidation of a biodegradable carbon source is demonstrated. The minimum voltage to fix CO2 was between −0.2 and −0.4 V. The Calvin–Benson–Bassham (CBB) cycle is the main electron sink at these voltages. However, lower voltages caused the decrease in the current intensity, reaching a minimum at −0.8 V (−4.75 mA). There was also a significant relationship between the soluble carbon uptake in terms of chemical oxygen demand and the electron consumption for the experiments performed at −0.6 and −0.8 V. These results indicate that the CBB cycle is not the only electron sink and some photoheterotrophic metabolic pathways are also being affected under electrochemical conditions. This behavior has not been tested before in photoheterotrophic conditions and paves the way for the future development of photobioelectrochemical systems under heterotrophic conditions.

scholarly journals Pathophysiology and clinical consequences of arterial blood gases and pH after cardiac arrest

2020 ◽  
Vol 8 (S1) ◽  
Author(s):  
Chiara Robba ◽  
Dorota Siwicka-Gieroba ◽  
Andras Sikter ◽  
Denise Battaglini ◽  
Wojciech Dąbrowski ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Mechanical Ventilation ◽  
Cardiac Arrest ◽  
Oxygen Demand ◽  
Blood Gases ◽  
Metabolic Energy ◽  
High Morbidity ◽  
Arterial Blood Gases ◽  
Arterial Blood ◽  
Clinical Consequences

AbstractPost cardiac arrest syndrome is associated with high morbidity and mortality, which is related not only to a poor neurological outcome but also to respiratory and cardiovascular dysfunctions. The control of gas exchange, and in particular oxygenation and carbon dioxide levels, is fundamental in mechanically ventilated patients after resuscitation, as arterial blood gases derangement might have important effects on the cerebral blood flow and systemic physiology.In particular, the pathophysiological role of carbon dioxide (CO2) levels is strongly underestimated, as its alterations quickly affect also the changes of intracellular pH, and consequently influence metabolic energy and oxygen demand. Hypo/hypercapnia, as well as mechanical ventilation during and after resuscitation, can affect CO2 levels and trigger a dangerous pathophysiological vicious circle related to the relationship between pH, cellular demand, and catecholamine levels. The developing hypocapnia can nullify the beneficial effects of the hypothermia. The aim of this review was to describe the pathophysiology and clinical consequences of arterial blood gases and pH after cardiac arrest.According to our findings, the optimal ventilator strategies in post cardiac arrest patients are not fully understood, and oxygen and carbon dioxide targets should take in consideration a complex pattern of pathophysiological factors. Further studies are warranted to define the optimal settings of mechanical ventilation in patients after cardiac arrest.

Design of a Synthetic Enzyme Cascade for the in vitro Fixation of a C1 Carbon Source to a Functional C4 Sugar

2021 ◽  
Author(s):  
Samed Güner ◽  
Vanessa Wegat ◽  
André Pick ◽  
Volker Sieber
Keyword(s):  
Carbon Dioxide ◽  
Carbon Source ◽  
Greenhouse Gas ◽  
Value Added ◽  
Waste Stream ◽  
Enzyme Cascade ◽  
Sustainable Future ◽  
Value Added Products

Realizing a sustainable future requires intensifying the waste stream conversion, such as converting the greenhouse gas carbon dioxide into value-added products. In this paper, we focus on utilizing formaldehyde as...

Novel biofilm reactor for denitrification of municipal wastewater

2018 ◽  
Vol 78 (7) ◽  
pp. 1566-1575 ◽  
Author(s):  
S. S. Rathnaweera ◽  
B. Rusten ◽  
K. Korczyk ◽  
B. Helland ◽  
E. Rismyhr
Keyword(s):  
Carbon Source ◽  
Municipal Wastewater ◽  
Low Cost ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Biofilm Reactor ◽  
Treated Wastewater ◽  
Removal Rates ◽  
Good Filter ◽  
Solids Removal

Abstract A pilot-scale CFIC® (continuous flow intermittent cleaning) reactor was run in anoxic conditions to study denitrification of wastewater. The CFIC process has already proven its capabilities for biological oxygen demand removal with a small footprint, less energy consumption and low cost. The present study focused on the applicability for denitrification. Both pre-denitrification (pre-DN) and post-denitrification (post-DN) were tested. A mixture of primary treated wastewater and nitrified wastewater was used for pre-DN and nitrified wastewater with ethanol as a carbon source was used for post-DN. The pre-DN process was carbon limited and removal rates of only 0.16 to 0.74 g NOx-N/m²-d were obtained. With post-DN and an external carbon source, 0.68 to 2.2 g NO3-Neq/m²-d removal rates were obtained. The carrier bed functioned as a good filter for both the larger particles coming with influent water and the bio-solids produced in the reactor. Total suspended solids removal in the reactor varied from 20% to 78% (average 45%) during post-DN testing period and 9% to 70% (average 29%) for pre-DN. The results showed that the forward flow washing improves both the DN function and filtration ability of the reactor.

scholarly journals Genome Sequence of Carbon Dioxide-Sequestering Serratia sp. Strain ISTD04 Isolated from Marble Mining Rocks

2016 ◽  
Vol 4 (5) ◽  
Author(s):  
Manish Kumar ◽  
Rajesh Kumar Gazara ◽  
Sandhya Verma ◽  
Madan Kumar ◽  
Praveen Kumar Verma ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Source ◽  
Sodium Bicarbonate ◽  
Genome Sequence ◽  
Sole Carbon Source

The Serratia sp. strain ISTD04 has been identified as a carbon dioxide (CO 2 )-sequestering bacterium isolated from marble mining rocks in the Umra area, Rajasthan, India. This strain grows chemolithotrophically on media that contain sodium bicarbonate (NaHCO 3 ) as the sole carbon source. Here, we report the genome sequence of 5.07 Mb Serratia sp. ISTD04.

scholarly journals Reconstructing metabolic pathways of a member of the genus Pelotomaculum suggesting its potential to oxidize benzene to carbon dioxide with direct reduction of sulfate

2016 ◽  
pp. fiw254 ◽  
Author(s):  
Xiyang Dong ◽  
Johannes Dröge ◽  
Christine von Toerne ◽  
Sviatlana Marozava ◽  
Alice C. McHardy ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Metabolic Pathways ◽  
Direct Reduction

Hydroxyl-anchored covalent organic crown-based polymers for CO2 fixation into cyclic carbonates at mild condition

2021 ◽  
Author(s):  
Yongjing Hao ◽  
Xiuli Yan ◽  
Tao Chang ◽  
Xiaohuan Liu ◽  
Lianwei Kang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Mild Condition ◽  
Co2 Fixation ◽  
Cyclic Carbonates ◽  
Organic Polymers ◽  
Carbon Dioxide Co2

The covalent organic polymers (COPs) are a kind of promising materials for carbon dioxide (CO2) reutilization. Herein, a series of covalent organic crown-based polymers (COCP-H, COCP-OH, COCP-CH3, COCP-Bu) were designed...

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