... is a chemical process in which hydrophobic molecules are preferentially separated from a liquid solution ... Jameson GJ 2007 Modeling continuous foam fractionation with reflux, Chemical Engineering and Processing 39, p.590 Ward AFH & ... that enabled a preliminary mechanistic description of foam fractionation. The synergies between foam fractionation and froth ... Foam fractionation proceeds via two mechanisms: The target molecule adsorbs to a bubble surface, and The bubbles form a foam ...
"Chemical fractionations in meteorites−III. Major element fractionations in chondrites". Geochim. Cosmochim. Acta. 34 (3): 367− ... Their overall chemical composition closely resembles the elemental composition of the Sun (and hence the whole Solar System), ... Chemical abundances are "very similar" to CM, "distinctly higher than the CI chondrite" levels. Although the carbon and ... Asplund, M.; Amarsi, A. M.; Grevesse, N. (2021). "The chemical make-up of the Sun: A 2020 vision". Astron. Astrophys. 653: A141 ...
"Theoretical Analysis of Chemical Isotope Fractionation by Orthogonal Polynomial Methods". Isotope Effects in Chemical Processes ... Initially used to approximate chemical reaction rates, models of isotope fractionation are used throughout the physical ... calculations of equilibrium isotopic fractionation in large organic molecules". Physical Chemistry Chemical Physics. 21 (32): ... Isotope fractionation modeling is a critical component of isotope geochemistry and can be used to reconstruct past Earth ...
Oxygen and sulfur isotope fractionation". Chemical Geology. 269 (3-4): 252-261. Bibcode:2010ChGeo.269..252T. doi:10.1016/j. ... Just like the fractionation of oxygen isotopes, the larger fractionations in sulfate from the disproportionation of elemental ... MSO has been found to produce small fractionations in 18O compared to water (~5‰). Given the very small fractionation of 18O ... The fractionation of sulfur and oxygen isotopes during microbial sulfide oxidation (MSO) has been studied to assess its ...
The Separation of Purified Fibrinogen from Fraction I of Human Plasma". Journal of the American Chemical Society. 70 (9): 3103- ... and immunological studies on the products of human plasma fractionation. XVI. Fibrin clots, fibrin films, and fibrinogen ... The Conversion of Human Fibrinogen to Fibrin under Various Conditions1,2". Journal of the American Chemical Society. 69 (2): ... Some Factors Influencing the Quantitative Determination of Fibrinogen1,2". Journal of the American Chemical Society. 69 (11): ...
A sequential chemical fractionation called Humeomics can be used to isolate more homogeneous humic fractions and determine ... May 15, 2017). "A molecular zoom into soil Humeome by a direct sequential chemical fractionation of soi". The Science of the ... Nebbioso A. and Piccolo A. (2011). "Basis of a Humeomics Science: Chemical Fractionation and Molecular Characterization of ... However, single classes of residual biomolecules have been identified by selective extractions and chemical fractionation, and ...
"Isotopic fractionation of the major elements of molten basalt by chemical and thermal diffusion". Geochimica et Cosmochimica ... Vesta has iron fractionations of 0.010 ± 0.010‰ per atomic mass unit. The chondritic reservoir exhibits fractionations of 0.069 ... In the future, the comparison of observed biological fractionation of iron on Earth to fractionation on other planetary bodies ... Iron isotopic fractionation is also commonly described in units of per mil per atomic mass unit. In many cases, the δ56Fe value ...
55 Equilibrium fractionation occurs between chemicals or phases that are in equilibrium with each other. In equilibrium ... Kinetic fractionation generally is enhanced compared to equilibrium fractionation and depends on factors such as reaction rate ... 60 Biological fractionation is a form of kinetic fractionation since reactions tend to be in one direction. Biological ... 70 Through a variety of physical and chemical processes, chemical elements change in concentration and move around in what are ...
Chemical engineering organizations, Distillation, Fractionation, 1952 establishments in Oklahoma). ... Fractionation Research Inc. (FRI) is an industry cooperative organization that researches the performance of industrial-scale ... "Fractionation Research Inc". Archived from the original on 2010-06-02. Retrieved 2009-11-09. Oklahoma State University Special ... FRI is a non-profit organization formed by petroleum, chemical and engineering companies to perform plant-scale research in ...
... chemical ecologists often make use of bioassay-guided fractionation. Today, chemical ecologists also incorporate genetic and ... the Max Planck Institute of Chemical Ecology was founded in Jena, Germany. Chemical defense Semiochemical Chemical ecologists ... Plant chemical ecology focuses on the role of chemical cues and signals in mediating interactions of plants with their biotic ... Chemical ecologists also study chemical interactions involved in indirect defenses of plants, such as the attraction of ...
Sims, K.W.W., H.E. Newsom, and E.S. Gladney (1990). "Chemical fractionation during formation of the Earth's core and ... at the University of New Mexico's Institute of Meteoritics in 1989, where his research focused on chemical fractionation during ... Chemical Geology, 412, 151-166, .org/10.1016/j.chemgeo.2015.07.023 *Arendt, C.A. S. M. Aciego, K.W.W. Sims, and S. M. Aarons ( ... "Chemical and isotopic constraints on the generation and transport of melt beneath the East Pacific Rise." Geochimica et ...
Mass-independent isotope fractionation or Non-mass-dependent fractionation (NMD), refers to any chemical or physical process ... Most isotopic fractionations (including typical kinetic fractionations and equilibrium fractionations) are caused by the ... 2). Almost all fractionations among isotopes of a given element scale to differences in their masses; NMD fractionations ... Equilibrium fractionation Kinetic fractionation Isotope geochemistry Timothy W. Lyons; Christopher T. Reinhard; Noah J. ...
"Chemical and enzymatic fractionation of cell walls from Fucales: Insights into the structure of the extracellular matrix of ...
Chemical fractionation between the ionic species in the plasma mixture can release a similar or even greater amount of energy. ... The magnetic fields in a white dwarf may allow for the existence of a new type of chemical bond, perpendicular paramagnetic ... ISBN 978-0-521-63097-9. Bergeron, P.; Ruiz, M. T.; Leggett, S. K. (1997). "The Chemical Evolution of Cool White Dwarfs and the ... Such densities are possible because white dwarf material is not composed of atoms joined by chemical bonds, but rather consists ...
Due to physical and chemical fractionation processes, the variations in the isotopic compositions of elements are reported, and ... Prinzhofer, Alain (1995). "Genetic and post-genetic molecular and isotopic fractionations in natural gases". Chemical Geology. ... The rate of a chemical reaction depends in part on the energies of the chemical bonds being formed and broken in the reaction. ... resulting in a fractionation of the different isotopes between the reactant and product in a chemical reaction. This is known ...
Schauble E, Rossman GR, Taylor HP (2004) Theoretical estimates of equilibrium chromium-isotope fractionations. Chemical Geology ... Chemical Geology 25, 79-94. Potter RM, Rossman GR (1979) Tetravalent manganese oxides - identification, hydration, and ... Journal of the American Chemical Society 110, 1367-1375. Lager GA, Armbruster T, Rotella FJ, Rossman GR (1989) The OH ... Journal of the American Chemical Society 94, 2683-2690. Goldman DS, Rossman GR, Dollase WA (1977) Channel constituents in ...
"Biomarker discovery from the plasma proteome using multidimensional fractionation proteomics". Current Opinion in Chemical ... His discovery of pheromone not only opens up the field of chemical biology of pheromone research in this model animal but also ... Park, Jun Young; Joo, Hyoe-Jin; Park, Saeram; Paik, Young-Ki (2019-08-09). "Ascaroside Pheromones: Chemical Biology and ... an important substance for chemical communication, developmental process and aging in C. elegans life history, for the first ...
"The fractionation of crude petroleum by capillary diffusion". American Chemical Journal. 40 (6): 495-537.{{cite journal}}: CS1 ... Runge dropped spots of different inorganic chemicals onto circles of filter paper already impregnated with another chemical, ... "Fractionation of California petroleum by diffusion through fuller's earth". American Chemical Journal. 50 (2): 59-100.{{cite ... Tsvet applied his observations with filter paper extraction to the new methods of column fractionation that had been developed ...
These chemical and anatomical mechanisms improve the ability of RuBisCO to fix carbon, rather than perform its wasteful ... Isotopic fractionation differs between C4 carbon fixation and C3, due to the spatial separation in C4 plants of CO2 capture (in ... The large fractionation of 13C in photosynthesis is due to the carboxylation reaction, which is carried out by the enzyme ... The isotope fractionations in C3 carbon fixation arise from the combined effects of CO2 gas diffusion through the stomata of ...
... fractionation during chemical processing can be problematic for certain isotopic analyses, such as measuring heavy isotope ... 2016). "Material" gives chemical formula, "Type of ratio" is the isotopic ratio reported in "Isotope ratio", and "Citation" ... In Table 1, "Name" refers to the common name of the reference, "Material" gives its chemical formula and phase, "Type of ratio ... By measuring a material of known isotopic composition, fractionation within the mass spectrometer can be removed during post- ...
Mass-dependent and mass-independent fractionation of minor sulfur isotopes may also be an important gauge for the sulfur cycle ... Takano, B. (June 1985). "Geochemical implications of sulfate in sedimentary carbonates". Chemical Geology. 49 (4): 393-403. ... Prior to this, the Archean Earth was exposed to high-energy radiation that caused mass-independent fractionation of various ... For example, sulfur at the time of Earth's formation should have (barring some accretion-related fractionation process for ...
There she continued work on using isotope fractionation to understand how chemical weathering of the continental crust has ... Rudnick has served as editor-in-chief of Chemical Geology from 2000 to 2010. In 2012 she was made Department Chair. In 2015 ... She worked out the chemical composition and depths of xenoliths. Whilst she was a student she used the Sensitive high- ... "Editor-In-Chief of Chemical Geology, Professor Roberta Rudnick, Elected to NAS". www.elsevier.com. Retrieved 2018-08-12. "Robin ...
During chemical fractionation, certain elements may become more or less concentrated, which can allow geochemists to quantify ... This phenomenon known as chemical fractionation and can be described by an equilibrium constant, K {\displaystyle K} which sets ... A study conducted in East China in 1998 looked at the chemical composition of various elements found in the crust in China. One ... Gao, Shan; Luo, Ting-Chuan; Zhang, Ben-Ren; Zhang, Hong-Fei; Han, Yin-wen; Zhao, Zi-Dan; Hu, Yi-Ken (1998). "Chemical ...
"Advanced fractionation technology for the oleochemical industry". Asia-Pacific Journal of Chemical Engineering. 2 (4): 315-321 ...
... foams having very high specific surface area is exploited in the chemical processes of froth flotation and foam fractionation. ... Chemical methods of foam control are not always desired with respect to the problems (i.e., contamination, reduction of mass ... Mechanical methods to prevent foam formation are more common than chemical ones. The acoustical property of the speed of sound ... For example, foam is a serious problem in the chemical industry, especially for biochemical processes. Many biological ...
Chemical kinetics, Isotope separation, Fractionation, Pages that use a deprecated format of the chem tags). ... Transient kinetic isotope effects (or fractionation) occur when the reaction leading to isotope fractionation does not follow ... the GEBIK and GEBIF equations become equivalent to the equation for steady-state kinetic isotope fractionation in both chemical ... Substrates and products appear in a chemical reaction with specific stoichiometric coefficients. When chemical reactions ...
Utilizing the then new techniques of ultra-centrifugation and chemical fractionation, Smadel made significant contributions to ...
Equilibrium isotope fractionation is the partial separation of isotopes between two or more substances in chemical equilibrium ... Kinetic fractionation Mass-independent fractionation Transient kinetic isotope fractionation Equilibrium constant § Effect of ... Equilibrium fractionation is a type of mass-dependent isotope fractionation, while mass-independent fractionation is usually ... The amount of isotopic fractionation in an exchange reaction can be expressed as a fractionation factor: α = ( h X / l X ) AX ...
... foam fractionation, chemical flocculation, and constructed wetlands. But because of the impracticality and / or high costs of ...
Crystallization elution fractionation (CEF): high-throughput chemical composition distribution analyzer by CEF TGIC: technique ... Chemical composition distribution Chemical composition distribution (CCD) together with the molar mass distribution (MMD) and ... crystallization analysis fractionation). Temperature rising elution fractionation (TREF): for the characterization of CCD in ... Preparative fractionation PREP mc2: preparative instrument to fractionate polymers by molar mass or composition (TREF or ...
"Si stable isotope fractionation during adsorption and the competition between kinetic and equilibrium isotope fractionation: ... and chemical processes. The study of stable isotope biogeochemistry of Si aims to quantify the different Si fluxes in the ... It is important to understand the extent and isotopic fractionations of these processes, as they alter the δ30Si values of the ... Sponges also show an isotopic preference for 28Si over 30Si, but the magnitude of their isotopic fractionation is often larger ...
Chemical elements, Alkali metals, Reducing agents, Chemical elements with body-centered cubic structure, Least dense things). ... Nuclear weapons manufacture and other nuclear physics applications are a major source of artificial lithium fractionation, with ... Chemical resemblances between the two metals include the formation of a nitride by reaction with N2, the formation of an oxide ... Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4. Kondev, F. G.; Wang, M.; Huang, W. J.; ...