Results 21 to 30 of about 742 (235)
Revista Brasileira de Ciência do Solo, 2010 Soil organic matter can be analyzed on the basis of the different fractions. Changes in the levels of organic matter, caused by land use, can be better understood by alterations in the different compartments.
Cícero Célio de Figueiredo +2 more
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Photosynthetic Fractionation of the Stable Isotopes of Oxygen and Carbon [PDF]
Plant Physiology, 1993 Isotope discrimination during photosynthetic exchange of O2 and CO2 was measured using enzyme, thylakoid, and whole cell preparations. Evolved oxygen from isolated spinach thylakoids was isotopically identical (within analytical error) to its source water.
R. D., Guy, M. L., Fogel, J. A., Berry
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Revista Ciência Agronômica, 2012 O papel fundamental da matéria orgânica nas características físicas, químicas e biológicas do solo, justifica o crescente interesse pela identificação de sistemas de uso e de manejo que contribuam para o aumento do estoque de carbono em solos tropicais ...
Celeste Queiroz Rossi +4 more
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Fractional flux periodicity in doped carbon nanotubes [PDF]
Physical Review B, 2004 An anomalous magnetic flux periodicity of the ground state is predicted in two-dimensional cylindrical surface composed of square and honeycomb lattice. The ground state and persistent currents exhibit an approximate fractional period of the flux quantum for a specific Fermi energy.
Sasaki, K., Murakami, S., Saito, R.
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Ciência Rural, 2008 Este trabalho teve por objetivo avaliar e comparar os teores e as características químicas das substâncias húmicas (SHs) de um Planossolo háplico submetido a diferentes sistemas de cultivos de arroz.
Carla Machado da Rosa +4 more
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EnergiesThe electrification of process industries is one of the main challenges when building a low-carbon society since they consume huge amounts of fossil fuels, generating different emissions. Heat pumps are some of the key players in the industrial sector of
Stanislav Boldyryev +2 more
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Carbon isotopic fractionation in heterotrophic microbial metabolism [PDF]
Applied and Environmental Microbiology, 1985 Differences in the natural-abundance carbon stable isotopic compositions between products from aerobic cultures of Escherichia coli K-12 were measured. Respired CO2 was 3.4% depleted in 13C relative to the glucose used as the carbon source, whereas the acetate was 12.3% enriched in 13C. The acetate 13C enrichment was solely in the carboxyl group.
N, Blair +5 more
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FEBS Letters, EarlyView.Embryo‐like structures (stembryos) are an innovative tool, but they are hindered by experimental variability and limited developmental potential. DNA methylation is crucial for mammalian development, but its status in stembryo models is poorly characterized.
Sara Canil +4 more
wiley +1 more source
Fractionation of the Stable Isotopes of Inorganic Carbon by Seagrasses [PDF]
Plant Physiology, 1980 The delta(13)C values for seagrasses collected along the Texas Gulf Coast range from -10.9 to -11.4 per thousand. These values are similar to the delta(13)C values of terrestrial C(4) plants, but seagrasses lack bundle sheath cells which are important in determining the delta(13)C values of C(4) plants.
C R, Benedict, W W, Wong, J H, Wong
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