Results 31 to 40 of about 735,801 (358)

Directly comparing coronal and solar wind elemental fractionation

, 2020
As the solar wind propagates through the heliosphere, dynamical processes irreversibly erase the signatures of the near-Sun heating and acceleration processes. The elemental fractionation of the solar wind should not change during transit however, making
Baker, D., Brooks, D. H., Owen, C. J., Stansby, D.   +3 more
core   +1 more source

Spatial and temporal variations of fractionation of stable isotopes in East-Antarctic snow

Journal of Glaciology, 2021
Stable isotope ratios (δ18O and δD) in Antarctic snow and ice are basic proxy indices of climate in ice core studies. The relation between the ratios has important indicative significance for moisture sources.
Chuanjin Li, Jiawen Ren, Guitao Shi, Hongxi Pang, Yetang Wang, Shugui Hou, Zhongqin Li, Zhiheng Du, Minghu Ding, Xiangyu Ma, Jiao Yang, Aihong Xie, Puyu Wang, Xiaoming Wang, Bo Sun, Cunde Xiao   +15 more
doaj   +1 more source

Carbon Fractionation in PDRs

, 2012
We upgraded the chemical network from the UMIST Database for Astrochemistry 2006 to include isotopes such as ^{13}C and ^{18}O. This includes all corresponding isotopologues, their chemical reactions and the properly scaled reaction rate coefficients. We
Ossenkopf, V., Röllig, M.
core   +1 more source

Three-isotope plot of fractionation in photolysis: A perturbation theoretical expression [PDF]

, 2005
The slope of the three-isotope plot for the isotopomer fractionation by direct or nearly direct photodissociation is obtained using a perturbation theoretical analysis.
Marcus, R. A., Prakash, M. K.
core   +1 more source

Using Fractionation and Diffusion Ordered Spectroscopy to Study Lignin Molecular Weight.

ChemistryOpen, 2019
Recent reports demonstrate that applications of the biopolymer lignin can be helped by the use of a fraction of the lignin which has an optimal molecular weight range.
James R. D. Montgomery, Priory Bazley, Dr. Tomas Lebl, Prof. Nicholas J. Westwood   +3 more
doaj   +1 more source

Atrial Electrogram Fractionation Distribution before and after Pulmonary Vein Isolation in Human Persistent Atrial Fibrillation—A Retrospective Multivariate Statistical Analysis

Frontiers in Physiology, 2017
Purpose: Complex fractionated atrial electrograms (CFAE)-guided ablation after pulmonary vein isolation (PVI) has been used for persistent atrial fibrillation (persAF) therapy.
Tiago P. Almeida, Tiago P. Almeida, Gavin S. Chu, Xin Li, Nawshin Dastagir, Jiun H. Tuan, Peter J. Stafford, Fernando S. Schlindwein, Fernando S. Schlindwein, G. André Ng, G. André Ng, G. André Ng   +11 more
doaj   +1 more source

Effect of Operating Conditions and Fructans Size Distribution on Tight Ultrafiltration Process for Agave Fructans Fractionation: Optimization and Modeling

Membranes, 2022
The objective of this work was to evaluate the effect of operating conditions and fructans size distribution on the tight Ultrafiltration process for agave fructans fractionation.
Noe Luiz-Santos, Rogelio Prado-Ramírez, Rosa María Camacho-Ruíz, Guadalupe María Guatemala-Morales, Enrique Arriola-Guevara, Lorena Moreno-Vilet   +5 more
doaj   +1 more source

Chlorine and Bromine Isotope Fractionation of Halogenated Organic Pollutants on Gas Chromatography Columns

, 2017
Compound-specific chlorine/bromine isotope analysis (CSIA-Cl/Br) has become a useful approach for degradation pathway investigation and source appointment of halogenated organic pollutants (HOPs).
Fan, Yujuan, Liu, Jun, Peng, Xianzhi, Tan, Jianhua, Tang, Caiming, Xiong, Songsong   +5 more
core   +1 more source

Fractionation statistics [PDF]

BMC Bioinformatics, 2011
Abstract Background Paralog reduction, the loss of duplicate genes after whole genome duplication (WGD) is a pervasive process. Whether this loss proceeds gene by gene or through deletion of multi-gene DNA segments is controversial, as is the question of fractionation bias, namely whether one homeologous chromosome is
Zheng Chunfang, Wang Baoyong, Sankoff David   +2 more
openaire   +3 more sources

Theoretical analysis of the dose dependence of the oxygen enhancement ratio and its relevance for clinical applications

Radiation Oncology, 2011
Background The increased resistance of hypoxic cells to ionizing radiation is usually believed to be the primary reason for treatment failure in tumors with oxygen-deficient areas.
Wenzl Tatiana, Wilkens Jan J
doaj   +1 more source