Extremely small quantities of carbon monoxide in air inhibit nitrogen fixation by red clover plants inoculated with Rhizobium trifolii (Lind and Wilson, 1941). In preliminary trials with Azotobacter vinelandii Wyss (1941) found a similar inhibition at carbon monoxide concentrations about 10 times those required for the symbiotic system. We have made a detailed study of the inhibition of this az...

Nitrogen-fixing activity declines first rapidly and then more gradually when Anabaenopsis circularis is transferred from light into dark conditions. The rate and duration of dark acetylene reduction (nitrogen fixation) depend upon conditions prevailing during the preceding light period. Factors (such as light intensity, CO2 concentration, and supply of glucose), which in the light affect photos...

Cyanobacteria are photosynthetic bacteria with a unique CO2 concentrating mechanism (CCM), enhancing carbon fixation. Understanding the CCM requires a systems level perspective of how molecular components work together to enhance CO2 fixation. We present a mathematical model of the cyanobacterial CCM, giving the parameter regime (expression levels, catalytic rates, permeability of carboxysome s...

In Northwestern China, the carbon fixing capacity of black locust (Robinia pseudoacacia) has been questioned because of its slow growth following the return of unproductive farmland to forest. To explore the effects of stand age on the carbon sequestration potential of R. pseudoacacia in a semi-arid, ecologically fragile area, parameters related to carbon fixation were investigated in plots of ...

sence of exogenously added glutamate and pyridoxal-5'-phosphate and produced radioactive aspartate in the presence of these components. Reduced nicotinamide adenine dinucleotide or reduced nicotinamide adenine dinucleotide phosphate could not be substituted for adenosine triphosphate (ATP); phosphoenolpyruvate even in the presence of nucleoside diphosphates could not replace pyruvate plus ATP; ...

Carbon fixation prediction during a bloom of Emiliania huxleyi is highly sensitive to the assumed regulation mechanism O. Bernard, A. Sciandra, and S. Rabouille COMORE-INRIA, BP93, 06902 Sophia-Antipolis Cedex, France LOV, UMR 7093, Station Zoologique, BP28, 06234, Villefranche-sur-mer, France Received: 1 April 2009 – Accepted: 5 May 2009 – Published: 28 May 2009 Correspondence to: O. Bernard (...

Calcite microfossils are widely used to study climate and oceanography in Earth's geological past. Coccoliths, readily preserved calcite plates produced by a group of single-celled surface-ocean dwelling algae called coccolithophores, have formed a significant fraction of marine sediments since the Late Triassic. However, unlike the shells of foraminifera, their zooplankton counterparts, coccol...

Influence of chemosynthetic substrates availability on symbiont densities, carbon assimilation and transfer in the dual symbiotic vent mussel Bathymodiolus azoricus V. Riou, S. Halary, S. Duperron, S. Bouillon, M. Elskens, R. Bettencourt, R. S. Santos, F. Dehairs, and A. Colaço Department of Oceanography and Fisheries, IMAR-University of Azores, Horta, Portugal Department of Analytical and Envi...

Carbon dioxide fixation has not been studied extensively in the invertebrate animal groups. In an early study Van Niel et al. (1) with Cl1 showed fixation of COZ into succinic acid in the protozoan Tetrahymena geleii. Hultin and Wessel (2) studied incorporation of C% into proteins of developing sea urchin eggs (Psammechinus miliaris) with attention on metabolic patterns of development rather th...