Results 241 to 250 of about 36,451 (292)

Bioavailability of organic phosphorus to Pseudokirchneriella subcapitata as affected by phosphorus starvation: An isotope dilution study

Water Research, 2013
Phosphorus (P) starved algae have a capacity to rapidly take up P when resupplied to P. This study was set-up to measure to what extent P starvation enhances the potential of algae to utilize organic P forms. The initial (
Christoff, Van Moorleghem, Nynke, De Schutter, Erik, Smolders, Roel, Merckx   +3 more
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Cosmic-ray-produced phosphorus isotopes in the atmosphere

Journal of Geophysical Research, 1966
Concentrations of P32 and P33 produced by interactions of secondary neutrons from cosmic rays with Ar in the atmosphere were determined radiochemically in ten samples of about 100 liters of rainwater collected at Fayetteville, Arkansas, during the period between June 1965 and February 1966. The observed P33/P32 ratios varied from 0.8 to 1.7.
M. N. Rao, L. Husain, P. K. Kuroda
openaire   +1 more source

EFFECT OF PREVIOUS FERTILIZATION ON PHOSPHORUS ADSORPTION. MEASUREMENT OF SURFACE PHOSPHORUS BY ISOTOPIC EXCHANGE

Soil Science, 1990
Adsorption properties of a soil with previous additions of different phosphate fertilizers were characterized by means of the Langmuir isotherm. The best correlation with the Langmuir isotherm was obtained for low added-phosphorus concentration and for conditions of different amounts of initial soil phosphorus treatment.
SILVIA C. LÓPEZ, NÉSTOR O. BÁRBARO, SUSANA ROJAS DE TRAMONTINI   +2 more
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Phosphorus isotopes P32 and P33 in rain water

Nuclear Physics, 1957
Abstract In 1955, Marquez and Costa 1) detected Phosphorus 32 (half life ≈ 14 days) in rain water. They attributed its presence to the spallation of atmospheric Argon nuclei by cosmic rays. We have detected, in rain water, the second short lived radio-isotope of Phosphorus, P 33 (half life ≈ 25 days).
D. Lal, N. Narasappaya, P.K. Zutshi
openaire   +1 more source

Tracing phosphorus cycle in global watershed using phosphate oxygen isotopes

Science of The Total Environment, 2022
The Phosphorus (P) cycle is a crucial biochemical process in the earth system. However, an extensive increase of P input into watersheds destroyed the ecosystem. To explore the effects of internal P loading and external P input in global watersheds, we reviewed the research progress and synthesized the isotope data of experimental results from ...
Ziteng, Wang, Qingjun, Guo, Liyan, Tian
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Formation of Lipin Phosphorus in Normal and Rachitic Rats, with a Radioactive Phosphorus Isotope as an Indicator

Nature, 1938
Formation of Lipin Phosphorus in Normal and Rachitic Rats, with a Radioactive Phosphorus Isotope as an ...
M. J. L. DOLS, B. C. P. JANSEN, G. J. SIZOO, F. BARENDREGT   +3 more
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Isotopic studies on the absorption and tissue distribution of white phosphorus in rats

Experimental and Molecular Pathology, 1971
Abstract The intestinal absorption and distribution of 32 P in different tissues of rats intoxicated with this element were studied in this experiment. The results indicated that phosphorus is rapidly absorbed and was mainly incorporated into the liver where it reached its maximum (69–73% of the given dose) within 2–3 hours. The hepatic subcellular
A K, Ghoshal, E A, Porta, W S, Hartroft
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Isotope Labeling to Study Phosphorus Uptake in the Arbuscular Mycorrhizal Symbiosis

2020
Isotope labeling enables the detection and quantification of nutrient fluxes between soil and plants through arbuscular mycorrhizal (AM) fungi. Here we describe the use of radioactive isotopes, 33P and 32P, to study the uptake of P from soil by AM fungal mycelium and its transfer to the host plant through the mycorrhizal pathway.
Cruz-Paredes, Carla, Gavito, Mayra E.
openaire   +3 more sources

Isotopic Exchange Reactions between Phosphorus Trichloride and Phosphorus Pentachloride¹

Journal of the American Chemical Society, 1957
A measurable exchange of isotoplcally labeled phosphorus and chlorine has been observed between phosphorus trichloride and phosphorus pentachloride in carbon tetrachloride solution. The exchange rates are the same within experimental error and the reaction is first order in phosphorus pentachloride and zero order in phosphorus trichloride.
Warren E. Becker, Rowland E. Johnson
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Phosphorus in Urban Sewage Sludges as Assessed by Isotopic Exchange

Soil Science Society of America Journal, 1996
Abstract Sewage sludges have been used for years as fertilizers but little information exists on the availability of P in these complex materials. Isotopically exchangeable P was measured in 12 urban sewage sludges using the isotopic exchange kinetics method.
Frossard, E., Sinaj, S., Dufour, P.
openaire   +2 more sources