Photoelectron spectroscopy of amino acids adsorbed upon surfaces: glycine on graphite

2007 ◽  
pp. 83-88 ◽  
Author(s):  
W. R. Salaneck ◽  
I. Lundström ◽  
B. Liedberg
Keyword(s):  
Amino Acids ◽  
Photoelectron Spectroscopy

X-Ray Photoelectron Spectroscopy of Amino Acids, Polypeptides and Simple Carbohydrates

1995 ◽  
pp. 251-260 ◽  
Author(s):  
Kenneth E. Dombrowski ◽  
Stephen E. Wright ◽  
Jannine C. Birkbeck ◽  
William E. Moddeman
Keyword(s):  
Amino Acids ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Simple Carbohydrates

Photoelectron Spectroscopy of the Adsorption of Amino Acids on Surfaces: Glycine on Si(O2)

1987 ◽  
Vol 35 (4) ◽  
pp. 586-589 ◽  
Author(s):  
C R Wu ◽  
J O Nilsson ◽  
W R Salaneck
Keyword(s):  
Amino Acids ◽  
Photoelectron Spectroscopy

Investigation of poly(L-amino acids) by x-ray photoelectron spectroscopy

1988 ◽  
Vol 60 (14) ◽  
pp. 1393-1397 ◽  
Author(s):  
Kenneth D. Bomben ◽  
Sukhendu B. Dev
Keyword(s):  
Amino Acids ◽  
Photoelectron Spectroscopy ◽  
X Ray

scholarly journals The Surface Composition of Amino Acid - KCl Solutions is pH-Dependent

2020 ◽  
Author(s):  
Geethanjali Gopakumar ◽  
Isaak Unger ◽  
Clara-Magdalena Saak ◽  
Gunnar Öhrwall ◽  
Arnaldo Naves de Brito ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Aqueous Solutions ◽  
Photoelectron Spectroscopy ◽  
Surface Composition ◽  
Inorganic Ions ◽  
X Ray ◽  
Ph Dependent

The manuscript based on X-ray photoelectron spectroscopy on aqueous solutions containing KCl and different amino acids. Our analysis suggests that the presence of the inorganic ions at the surface of the liquid is strongly dependent on the pH of the solution and the type of amino acid.

scholarly journals Bio-Precipitation of Carbonate and Phosphate Minerals Induced by the Bacterium Citrobacter freundii ZW123 in an Anaerobic Environment

Minerals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 65 ◽  
Author(s):  
Bin Sun ◽  
Hui Zhao ◽  
Yanhong Zhao ◽  
Maurice Tucker ◽  
Zuozhen Han ◽  
...  
Keyword(s):  
Amino Acids ◽  
Functional Groups ◽  
Photoelectron Spectroscopy ◽  
Extracellular Polymeric Substances ◽  
Selective Adsorption ◽  
Thermal Studies ◽  
Preferred Orientation ◽  
Citrobacter Freundii ◽  
Organic Functional Groups ◽  
Close Relationship

In this study, a facultative anaerobic strain isolated from marine sediments and identified as Citrobacter freundii, was used to induce the precipitation of carbonate and phosphate minerals in the laboratory under anaerobic conditions. This is the first time that the ability of C. freundii ZW123 to precipitate carbonate and phosphate minerals has been demonstrated. During the experiments, carbonic anhydrase, alkaline phosphatase and ammonium released by the bacteria not only promoted an increase in pH, but also drove the supersaturation and precipitation of carbonate and phosphate minerals. The predominant bio-mediated minerals precipitated at various Mg/Ca molar ratios were calcite, vaterite, Mg-rich calcite, monohydrocalcite and struvite. A preferred orientation towards struvite was observed. Scanning transmission electron microscopy (STEM) and elemental mapping showed the distribution of magnesium and calcium elements within Mg-rich calcite. Many organic functional groups, including C=O, C–O–C and C–O, were detected within the biominerals, and these functional groups were also identified in the associated extracellular polymeric substances (EPS). Fifteen kinds of amino acid were detected in the biotic minerals, almost identical to those of the EPS, indicating a close relationship between EPS and biominerals. Most amino acids are negatively charged and able to adsorb cations, providing an oversaturated microenvironment to facilitate mineral nucleation. The X-ray photoelectron spectroscopy (XPS) spectrum of struvite shows the presence of organic functional groups on the mineral surface, suggesting a role of the microorganism in struvite precipitation. The ZW123 bacteria provided carbon and nitrogen for the formation of the biotic minerals through their metabolism, which further emphasizes the close relationship between biominerals and the microorganisms. Thermal studies showed the enhanced thermal stability of biotic minerals, perhaps due to the participation of the bacteria ZW123. The presence of amino acids such as Asp and Glu may explain the high magnesium content of some calcites. Molecular dynamics simulations demonstrated that the morphological change and preferred orientation were likely caused by selective adsorption of EPS onto the various struvite crystal surfaces. Thus, this study shows the significant role played by C. freundii ZW123 in the bioprecipitation of carbonate and phosphate minerals and provides some insights into the processes involved.

Infrared and photoelectron spectroscopy of amino acids on copper: Glycine, l-alanine and β-alanine

1990 ◽  
Vol 140 (1) ◽  
pp. 192-206 ◽  
Author(s):  
A Ihs ◽  
B Liedberg ◽  
K Uvdal ◽  
C Törnkvist ◽  
P Bodö ◽  
...  
Keyword(s):  
Amino Acids ◽  
Photoelectron Spectroscopy

scholarly journals Cryogenic “Iodide-Tagging” Photoelectron Spectroscopy: A Sensitive Probe for Specific Binding Sites of Amino Acids

2020 ◽  
Vol 11 (11) ◽  
pp. 4346-4352 ◽  
Author(s):  
Hanhui Zhang ◽  
Wenjin Cao ◽  
Qinqin Yuan ◽  
Xiaoguo Zhou ◽  
Marat Valiev ◽  
...  
Keyword(s):  
Amino Acids ◽  
Photoelectron Spectroscopy ◽  
Binding Sites ◽  
Specific Binding ◽  
Specific Binding Sites

scholarly journals The Surface Composition of Amino Acid - KCl Solutions is pH-Dependent

2020 ◽  
Author(s):  
Geethanjali Gopakumar ◽  
Isaak Unger ◽  
Clara-Magdalena Saak ◽  
Gunnar Öhrwall ◽  
Arnaldo Naves de Brito ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Aqueous Solutions ◽  
Photoelectron Spectroscopy ◽  
Surface Composition ◽  
Inorganic Ions ◽  
X Ray ◽  
Ph Dependent

The manuscript based on X-ray photoelectron spectroscopy on aqueous solutions containing KCl and different amino acids. Our analysis suggests that the presence of the inorganic ions at the surface of the liquid is strongly dependent on the pH of the solution and the type of amino acid.

scholarly journals Predicting Core Level Photoelectron Spectra of Amino Acids Using Density Functional Theory

2020 ◽  
Author(s):  
Jo Pi ◽  
Martina Stella ◽  
Nathalie Fernando ◽  
Aaron Lam ◽  
Anna Regoutz ◽  
...  
Keyword(s):  
Amino Acids ◽  
Density Functional Theory ◽  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
Density Functional ◽  
Core Level ◽  
Photoelectron Spectra ◽  
Basis Sets ◽  
Functional Theory ◽  
Crystalline Amino Acids

<div>Core level photoelectron spectroscopy is a widely used technique to study amino acids. Interpretation of the individual contributions from functional groups and their local chemical environments to overall spectra requires both high-resolution reference spectra and theoretical insights, for example from density functional theory calculations. This is a particular challenge for crystalline amino acids due to the lack of experimental data and the limitation of previous calculations to gas phase molecules. </div><div>Here, a state of the art multiresolution approach is used for high precision gas phase calculations and to validate core hole pseudopotentials for plane-wave calculations. This powerful combination of complementary numerical techniques provides a framework for accurate ΔSCF calculations for molecules and solids in systematic basis sets. It is used to successfully predict C and O 1<i>s</i> core level spectra of glycine, alanine and serine and identify chemical state contributions to experimental spectra of crystalline amino acids.</div>

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