Photosynthetic Production of Ulva rotundata Bliding Estimated by Oxygen and Inorganic Carbon Exchange Measurements in the Field

2003 ◽  
Vol 46 (4) ◽  
Author(s):  
J. M. Mercado ◽  
A. Avilés ◽  
E. Benítez ◽  
M. Carrasco ◽  
L. Palomo ◽  
...  
Keyword(s):  
Inorganic Carbon ◽  
Carbon Exchange ◽  
Photosynthetic Production

scholarly journals PII-like signaling protein SbtB links cAMP sensing with cyanobacterial inorganic carbon response

2018 ◽  
Vol 115 (21) ◽  
pp. E4861-E4869 ◽  
Author(s):  
Khaled A. Selim ◽  
Florian Haase ◽  
Marcus D. Hartmann ◽  
Martin Hagemann ◽  
Karl Forchhammer
Keyword(s):  
Inorganic Carbon ◽  
Nucleotide Binding ◽  
Binding Pocket ◽  
Oxygenic Photosynthesis ◽  
Binding Modes ◽  
Signaling Protein ◽  
Evolutionarily Conserved ◽  
Photosynthetic Production ◽  
The Individual ◽  
Physiological And Biochemical

Cyanobacteria are phototrophic prokaryotes that evolved oxygenic photosynthesis ∼2.7 billion y ago and are presently responsible for ∼10% of total global photosynthetic production. To cope with the evolutionary pressure of dropping ambient CO2 concentrations, they evolved a CO2-concentrating mechanism (CCM) to augment intracellular inorganic carbon (Ci) levels for efficient CO2 fixation. However, how cyanobacteria sense the fluctuation in Ci is poorly understood. Here we present biochemical, structural, and physiological insights into SbtB, a unique PII-like signaling protein, which provides new insights into Ci sensing. SbtB is highly conserved in cyanobacteria and is coexpressed with CCM genes. The SbtB protein from the cyanobacterium Synechocystis sp. PCC 6803 bound a variety of adenosine nucleotides, including the second messenger cAMP. Cocrystal structures unraveled the individual binding modes of trimeric SbtB with AMP and cAMP. The nucleotide-binding pocket is located between the subunit clefts of SbtB, perfectly matching the structure of canonical PII proteins. This clearly indicates that proteins of the PII superfamily arose from a common ancestor, whose structurally conserved nucleotide-binding pocket has evolved to sense different adenyl nucleotides for various signaling functions. Moreover, we provide physiological and biochemical evidence for the involvement of SbtB in Ci acclimation. Collectively, our results suggest that SbtB acts as a Ci sensor protein via cAMP binding, highlighting an evolutionarily conserved role for cAMP in signaling the cellular carbon status.

scholarly journals Total organic and inorganic carbon exchange through the Strait of Gibraltar in September 1997

2001 ◽  
Vol 48 (5) ◽  
pp. 1217-1235 ◽  
Author(s):  
Evgeny Dafner ◽  
Melchor González-Dávila ◽  
J Magdalena Santana-Casiano ◽  
Richard Sempéré
Keyword(s):  
Inorganic Carbon ◽  
Carbon Exchange ◽  
Strait Of Gibraltar ◽  
Organic And Inorganic Carbon

Photosynthesis and inorganic carbon acquisition in the cyanobacterium Chlorogloeopsis sp. ATCC 27193

1997 ◽  
Vol 99 (1) ◽  
pp. 81-88
Author(s):  
Robert S. Skleryk ◽  
Pascal N. Tyrrell ◽  
George S. Espie
Keyword(s):  
Inorganic Carbon ◽  
Inorganic Carbon Acquisition

Scaling risk assessment in a closed circuit recycled board mill by speciation methods

TAPPI Journal ◽  
2012 ◽  
Vol 11 (5) ◽  
pp. 53-61 ◽  
Author(s):  
PATRICK HUBER ◽  
SYLVIE NIVELON ◽  
PATRICE NORTIER
Keyword(s):  
Calcium Carbonate ◽  
Volatile Fatty Acids ◽  
Inorganic Carbon ◽  
Stability Index ◽  
Closed Circuit ◽  
Critical Problem ◽  
Local Scaling ◽  
Water Analyses ◽  
Closed Water ◽  
Speciation Calculation

Calcium carbonate scaling often is a critical problem for recycled board mills that have closed water circuits. The objective of this study was to determine local scaling risks throughout the production process. To predict scaling potential, we calculated several saturation indexes, based on speciation determined from detailed water analyses. Calculated scaling trends are in accordance with observed dissolution and precipitation of calcium carbonate in the process, when considering local aeration phenomena. The importance of volatile fatty acids (resulting from anaerobic bacterial activity) in calco-carbonic equilibriums is discussed, and taken into account in the speciation calculation. We also demonstrate the need to measure inorganic carbon instead of alkalinity in such conditions. This makes typical scaling indexes, such as the Ryznar Stability Index, irrelevant to predict scaling risk in closed circuit conditions; thus, it is necessary to use general speciation methods, as described in this paper.

The inorganic carbon cycle

2005 ◽  
Vol 33 (1) ◽  
pp. 9-12
Author(s):  
György Várallyay
Keyword(s):  
Carbon Cycle ◽  
Inorganic Carbon ◽  
Inorganic Carbon Cycle
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