Results 21 to 30 of about 43,240 (245)

Carbon Dioxide Fixation in the Light and in the Dark by Isolated Spinach Chloroplasts [PDF]

Plant Physiology, 1974
Factors affecting CO(2) fixation in the spinach (Spinacia oleracea) chloroplast were investigated. Free magnesium ions are shown to be highly inhibitory for photosynthetic CO(2) fixation in isolated intact spinach chloroplasts. The pH optimum for CO(2) fixation is about 8.5 but is dependent upon the reaction medium.
M, Avron, M, Gibbs
openaire   +2 more sources

Far-Red Chlorophyll Fluorescence Radiance Tracks Photosynthetic Carbon Assimilation Efficiency of Dark Reactions

Applied Sciences, 2021
Solar-induced chlorophyll fluorescence (SIF) observations from space have shown close relationships with terrestrial photosynthesis rates. SIF originates from the light reactions of photosynthesis, whereas carbon fixation takes place during the dark ...
Zhunqiao Liu, Chenhui Guo, Yanwen Bai, Nina Zhang, Qiang Yu, Feng Zhao, Xiaoliang Lu   +6 more
doaj   +1 more source

Diurnal Regulation of In Vivo Localization and CO₂-Fixing Activity of Carboxysomes in Synechococcus elongatus PCC 7942

Life, 2020
Carboxysomes are the specific CO2-fixing microcompartments in all cyanobacteria. Although it is known that the organization and subcellular localization of carboxysomes are dependent on external light conditions and are highly relevant to their functions,
Yaqi Sun, Fang Huang, Gregory F. Dykes, Lu-Ning Liu   +3 more
doaj   +1 more source

The Role of Dark Carbon Dioxide Fixation in Root Nodules of Soybean [PDF]

Plant Physiology, 1986
The magnitude and role of dark CO(2) fixation were examined in nodules of intact soybean plants (Harosoy 63 x Rhizobium japonicum strain USDA 16). The estimated rate of nodule dark CO(2) fixation, based on a 2 minute pulse-feed with (14)CO(2) under saturating conditions, was 102 micromoles per gram dry weight per hour. This was equivalent to 14% of net
B J, King, D B, Layzell, D T, Canvin
openaire   +2 more sources

RELATIONSHIP BETWEEN LIGHT CARBON DIOXIDE FIXATION AND DARK CARBON DIOXIDE FIXATION BY MARINE ALGAE1 [PDF]

Limnology and Oceanography, 1971
The ratio of CO2 fixation in light to that in dark increases with increasing cell concentration of phytoplankton, both in natural populations of phytoplankton in the Florida Strait and in cultures of marine algae. The relevance of this phenomenon to the standard method of determining primary production in the oceans by means of carbon‐14 is discussed.
Ian Morris, Clarice M. Yentsch, Charles S. Yentsch   +2 more
openaire   +1 more source

Biocrust carbon exchange varies with crust type and time on Chihuahuan Desert gypsum soils

Frontiers in Microbiology, 2023
IntroductionIn dryland systems, biological soil crusts (biocrusts) can occupy large areas of plant interspaces, where they fix carbon following rain. Although distinct biocrust types contain different dominant photoautotrophs, few studies to date have ...
Mikaela R. Hoellrich, Darren K. James, David Bustos, Anthony Darrouzet-Nardi, Louis S. Santiago, Nicole Pietrasiak, Nicole Pietrasiak   +6 more
doaj   +1 more source

Interplay between autotrophic and heterotrophic prokaryotic metabolism in the bathypelagic realm revealed by metatranscriptomic analyses

Microbiome, 2023
Background Heterotrophic microbes inhabiting the dark ocean largely depend on the settling of organic matter from the sunlit ocean. However, this sinking of organic materials is insufficient to cover their demand for energy and alternative sources such ...
Abhishek Srivastava, Daniele De Corte, Juan A. L. Garcia, Brandon K. Swan, Ramunas Stepanauskas, Gerhard J. Herndl, Eva Sintes   +6 more
doaj   +1 more source

The Predominance of Ammonia-Oxidizing Archaea in an Oceanic Microbial Community Amended with Cyanobacterial Lysate

Microbiology Spectrum, 2023
When the oligotrophic microbial community was amended with Synechococcus-derived dissolved organic matter (SDOM) and incubated under the dark condition, archaea relative abundance was initially very low but made up more than 60% of the prokaryotic ...
Yufeng Jia, Madeline Lahm, Qi Chen, Leanne Powers, Michael Gonsior, Feng Chen   +5 more
doaj   +1 more source

Different behaviors of organic matter under physical-biological controls in the eastern Indian Ocean

Frontiers in Marine Science, 2023
Marine organic matter (OM) pools are the key to understanding biogeochemical cycles and carbon storage, especially under ongoing ocean warming. The tropical eastern Indian Ocean (IO) is ideal for unraveling marine OM pools for being one of the least ...
Yixue Zhang, Ying Wu, Jing Zhang, Yi Xu, Ke Huang, Jie Jin, Jinlong Dai, Qi Ye, Jian Li, Zhenqiu Zhang   +9 more
doaj   +1 more source

Influence of Light and Darkness upon Carbon Dioxide Fixation. [PDF]

Plant Physiology, 1956
For plants sensitive to photoperiodism light is generally essential for flowering, and the requirement for C02 with the light indicates a photosynthetic function for the light period (21, 10). There appears to be an additional role of light in which it apparently alters a photoreceptor pigment controlling floral initiation (22).
S P, Sen, A C, Leopold
openaire   +2 more sources