Results 31 to 40 of about 327,817 (261)

Predicting arsenic solubility in contaminated soils using isotopic dilution techniques.

, 2002
An isotopic dilution assay was developed to measure radiolabile As concentration in a diverse range of soils (pH 3.30−7.62; % C = 1.00−6.55). Soils amended with 50 mg of As kg-1 (as Na2HAsO4·7H2O) were incubated for over 800 d in an aerated “microcosm ...
Preston, S., Paton, G. I., Kilham, K., Zhang, Hao, Mcgrath, S. P., Bailey, E. H., Crout, N. M. J., Young, S. D., Davison, William, Zhang, H., Tye, A. M., Davison, W., Crout, N. M.J.   +12 more
core   +1 more source

N2O production in the eastern South Atlantic: analysis of N2O stable isotopic and concentration data [PDF]

, 2014
The stable isotopic composition of dissolved nitrous oxide (N2O) is a tracer for the production, transport, and consumption of this greenhouse gas in the ocean.
Nevison, Cynthia, Frame, Caitlin, Karen L. Casciotti, Casciotti, Karen, Deal, Eric, Caitlin H. Frame, Eric Deal, Cynthia D. Nevison   +7 more
core   +1 more source

Timing carbon turnover (δ13C) in weaned piglet’s brain by IRMS

Anais da Academia Brasileira de Ciências, 2018
Isotope-ratio mass spectrometry (IRMS) is a potential tool that provides time-integrated estimate of assimilated and not just ingested nutrients. This feature turned possible its application to evaluate the effects of dietary nucleotides and glutamate on
MAYRA A.D. SALEH, LUAN S. DOS SANTOS, DIRLEI A. BERTO, ALESSANDRO B. AMORIM, VLADIMIR E. COSTA, CARLOS DUCATTI   +5 more
doaj   +1 more source

Realisation and preliminary validation of a dilution device for the generation of CO2 gas mixtures

Measurement: Sensors, 2021
The present paper describes the activity carried out at Istituto Nazionale di Ricerca Metrologica (INRIM) within the EMPIR Joint Research Project 16ENV06 “Metrology for Stable Isotope Reference Standards - SIRS”, for the realisation of a dilution device ...
Francesca Rolle, Michela Sega, Francesca Romana Pennecchi, Pier Giorgio Spazzini, Stefano Pavarelli, Marco Santiano   +5 more
doaj   +1 more source

Aproveitamento de nitrogênio pelo milho, em razão da adubação verde, nitrogenada e fosfatada Nitrogen utilization by corn as affected by green manures and nitrogen and phosphorus fertilizers

Pesquisa Agropecuária Brasileira, 2009
O objetivo deste trabalho foi avaliar o aproveitamento, pelo milho (Zea mays L.), do nitrogênio (N) proveniente da ureia, de restos culturais da crotalária (Crotalaria juncea) e do milheto (Pennisetum glaucum), e do solo, em função da adubação ...
Edson Cabral da Silva, Takashi Muraoka, Felipe Carlos Alvarez Villanueva, Freddy Sinencio Contreras Espinal   +3 more
doaj   +1 more source

Antagonistic Interaction of Selenium and Cadmium in Human Hepatic Cells Through Selenoproteins

Frontiers in Chemistry, 2022
Cadmium (Cd) is a highly toxic heavy metal for humans and animals, which is associated with acute hepatotoxicity. Selenium (Se) confers protection against Cd-induced toxicity in cells, diminishing the levels of ROS and increasing the activity of ...
S. Ramírez-Acosta, R. Uhlírová, F. Navarro, J. L. Gómez-Ariza, T. García-Barrera   +4 more
doaj   +1 more source

Diagnóstico da deficiência de fósforo em ovinos pela técnica de incorporação de fósforo radioativo nos eritrócitos Phosphorus deficiency diagnosis in sheep using labeled phosphorus uptake by erythrocytes

Pesquisa Agropecuária Brasileira, 2006
Este trabalho teve como objetivo avaliar a técnica de incorporação de 32P pelos eritrócitos de ovinos jovens, mantidos em pastejo de Andropogon gayanus, como método de diagnóstico da deficiência de fósforo.
Dalton Araujo Antunes, Helder Louvandini, José Cleto da Silva Filho, Concepta Margaret McManus, Bruno Steffano Dallago, Bruno de Oliveira Machado, Dharana Guedes Mendonça, Patrícia Spoto Correa   +7 more
doaj   +1 more source

An Isotopic Dilution Approach for Quantifying Mercury Lability in Soils [PDF]

, 2017
The accurate estimation of soil mercury lability is crucial for risk assessment. In comparison to chemical fractionation and speciation, isotopic dilution (ID) offers precise definition of labile mercury fractions while maintaining the natural ...
Osterwalder, Stefan, Waleed H. Shetaya, Jen-How Huang, Alewell, Christine, Huang, Jen-How, Adrien Mestrot, Bigalke, Moritz, Stefan Osterwalder, Mestrot, Adrien, Christine Alewell, Shetaya, Waleed H., Moritz Bigalke   +11 more
core   +4 more sources

Invisible but not inaccessible—Revealing transient oligomers formed by intrinsically disordered proteins with solution NMR and complementary methods

FEBS Letters, EarlyView.
Transient oligomers formed by intrinsically disordered proteins may be ‘invisible’ to direct detection yet remain accessible to solution NMR through equilibrium‐exchange measurements and pressure‐jump experiments. Complementary methods report on mass, stoichiometry, selected distance distributions, morphology, and internal packing.
Martin D. Gelenter, Ad Bax
wiley   +1 more source

Phosphorus availability and speciation in the fertosphere of three soils over 12 months

Geoderma
Identifying the effects of soil properties on the transformations of phosphorus (P) in highly concentrated fertiliser bands is a critical component in improving P fertiliser use efficiency, but little is known regarding the kinetics of P transformation ...
Brigid A. McKenna, Peter M. Kopittke, Michael J. Bell, Enzo Lombi, Wantana Klysubun, Timothy I. McLaren, Casey L. Doolette, Gregor Meyer   +7 more
doaj   +1 more source