Infrared spectroscopic characterization of phosphate binding at the goethite–water interface

2019 ◽  
Vol 21 (8) ◽  
pp. 4421-4434 ◽  
Author(s):  
Ashour A. Ahmed ◽  
Stella Gypser ◽  
Peter Leinweber ◽  
Dirk Freese ◽  
Oliver Kühn
Keyword(s):  
Theoretical Study ◽  
Spectroscopic Characterization ◽  
Water Interface ◽  
Phosphate Binding ◽  
Molecular Binding ◽  
Ft Ir ◽  
Periodic Dft Calculations ◽  
Binding Mechanisms ◽  
Ft Ir Spectroscopy

The molecular binding mechanisms for the adsorbed phosphate at the goethite–water interface have been explored via a joint experimental/theoretical study. This study involved performing sorption experiments, characterization by FT-IR spectroscopy, and performing periodic DFT calculations.

Spectroscopic Characterization of Normal Primary and Malignant Cells Transformed by Retroviruses

2002 ◽  
Vol 56 (5) ◽  
pp. 640-645 ◽  
Author(s):  
Mahmoud Huleihel ◽  
Vitaly Erukhimovitch ◽  
Marina Talyshinsky ◽  
Mark Karpasas
Keyword(s):  
Ir Spectroscopy ◽  
Spectroscopic Characterization ◽  
Primary Cells ◽  
Malignant Cells ◽  
Ir Microscopy ◽  
Murine Sarcoma Virus ◽  
Sarcoma Virus ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Microscopic FT-IR spectroscopy was used to investigate spectral differences between various primary cells obtained from different sources (mouse, rat, rabbit, and human) and malignant cells transformed by murine sarcoma virus (MuSV). The advantage of this method over conventional FT-IR spectroscopy is that it facilitates inspection of restricted regions of tissue. Our results showed significant and consistent differences between all the tested normal and malignant cells. An impressive decrease in the levels of vital cellular metabolites was seen in malignant cells compared to normal cells. The peak attributed to the PO2− symmetric stretching mode at 1082 cm−1 was shifted significantly to a higher frequency (1086–1087 cm−1) in all the tested malignant cells. The impressive and consistent differences between normal primary cells and malignant cells (obtained from various organs and species) in the shapes and position of various bands throughout the spectrum strongly support the possibility of developing FT-IR microscopy as a diagnostic method for the detection and study of cancer cells.

Thermodynamic and Spectroscopic Characterization of the Berenil and Pentamidine Complexes with the Dodecanucleotide d(CGCGATATCGCG)2

1995 ◽  
Vol 50 (3-4) ◽  
pp. 263-274 ◽  
Author(s):  
Hans-Uwe Schmitz ◽  
Wigand Hübner ◽  
Theodor Ackermann
Keyword(s):  
Uv Spectroscopy ◽  
Spectroscopic Characterization ◽  
Structural Features ◽  
Binding Parameters ◽  
Scanning Calorimetry ◽  
Coil Transition ◽  
Ft Ir ◽  
Van’T Hoff Enthalpy ◽  
Ft Ir Spectroscopy

The dodecanucleotide d(CGCGATATCGCG)2 was characterized by thermodynamic and UV-spectrophotometric measurements. A van’t Hoff enthalpy of ΔHuvv.H. ~ - 190 kJ/mol was determined for the thermal transition using UV spectroscopy. This value was confirmed by differential scanning calorimetry (DSC). In addition we obtained the thermodynamic data ΔHDSC = -405.1 kJ/mol, ΔSDSC = -1290 J/mol·K and ΔGDSC = -53.2 kJ/mol for the helix to coil transition of the dodecanucleotide. The association of berenil and the oligonucleotide was accompanied with a stabilization of the host duplex (increase in Tm) and an increase in the van’t Hoff enthalpy. The berenil binding parameters (ΔΔHDSC = -32.6 kJ/mol, ΔΔSDSC = -72 J/mol·K and ΔΔGDSC = -11.1 kJ/mol) revealed significant differences compared to those of the pentamidine aggregation (ΔΔHDSC = -23.7 kJ/mol, ΔΔSDSC = -53 J/mol·K and ΔΔGDSC = -7.8 kJ/mol). The transition of the pure oligonucleotide was characterized by a substantial amount of intermediate states (σDSC = 0.43) which decreased significantly upon binding of the drugs (σDSC ~ 0.80). The structural features of the complexes were analyzed by FT-IR spectroscopy. From these experiments we conclude that the configurations in the berenil and pentamidine complexes are different.

FT-IR and micro-Raman spectroscopic characterization of minerals in high-calcium coal ashes

2018 ◽  
Vol 91 (3) ◽  
pp. 389-396 ◽  
Author(s):  
Yanshan Yin ◽  
Jie Yin ◽  
Wei Zhang ◽  
Hong Tian ◽  
Zhangmao Hu ◽  
...  
Keyword(s):  
Spectroscopic Characterization ◽  
Raman Spectroscopic ◽  
High Calcium ◽  
Ft Ir ◽  
Coal Ashes

Photoacoustic FT-IR Spectroscopy of Natural Copper Patina

1995 ◽  
Vol 49 (10) ◽  
pp. 1516-1524 ◽  
Author(s):  
Alex O. Salnick ◽  
Werner Faubel
Keyword(s):  
Depth Distribution ◽  
Depth Profiling ◽  
Beam Deflection ◽  
City Hall ◽  
Spectral Bands ◽  
Special Sample Preparation ◽  
Ft Ir ◽  
Infrared Photoacoustic Spectroscopy ◽  
Ft Ir Spectroscopy

Fourier transform infrared photoacoustic spectroscopy (FT-IR/PAS) has proved to be a useful tool for nondestructive testing of copper corrosion layer (patina) formed in the atmosphere. The samples cut from a piece of the roof of the Stockholm City Hall were examined without any additional pretreatment. The components of the patina—brochantite Cu4(OH)6SO4, antlerite Cu3(OH)4SO4, and basic cupric carbonate Cu2CO3(OH)6 · H2O—as well as some other minerals were identified. The photothermal beam deflection (PBD) method was used for independent photoacoustic characterization of the samples. The depth profiling capability of FT-IR/PAS was used to determine the degree of photoacoustic saturation of the spectral bands and to evaluate the depth distribution of the main patina components. The technique thus compares favorably with more common approaches of patina examination which are more expensive and require special sample preparation.

Characterization of different decomposition stages of biowaste using FT-IR spectroscopy and pyrolysis-field ionization mass spectrometry

2005 ◽  
Vol 16 (1) ◽  
pp. 67-79 ◽  
Author(s):  
Ena Smidt ◽  
Kai-uwe Eckhardt ◽  
Peter Lechner ◽  
Hans-rolf Schulten ◽  
Peter Leinweber
Keyword(s):  
Mass Spectrometry ◽  
Ir Spectroscopy ◽  
Ionization Mass Spectrometry ◽  
Field Ionization ◽  
Ionization Mass ◽  
Ft Ir ◽  
Decomposition Stages ◽  
Ft Ir Spectroscopy

FT-IR spectroscopy characterization of schwannoma: a case study

2016 ◽  
Author(s):  
Isabelle Ferreira ◽  
Lazaro P. M. Neto ◽  
Maurilio José das Chagas ◽  
Luís Felipe C. S. Carvalho ◽  
Laurita dos Santos ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Electrochemically Synthesis and Characterization of Copolymers Based on 1, 4-Diethoxybenzene and 3, 4-Ethylenedioxythiophene

2011 ◽  
Vol 335-336 ◽  
pp. 989-993
Author(s):  
Mi Ouyang ◽  
Zhen Wei Yu ◽  
Yi Xu ◽  
Yu Jian Zhang ◽  
Cheng Zhang
Keyword(s):  
Cyclic Voltammetry ◽  
Ir Spectroscopy ◽  
Feed Ratio ◽  
Synthesis And Characterization ◽  
Monomer Mixture ◽  
Long Wavelength ◽  
H Nmr ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Copolymers based on 1, 4-diethoxybenzene (DEB) and 3, 4-ethylenedioxythiophene (EDOT) were electrochemically synthesized and characterized. The structures of the copolymers were established by 1H NMR and FT-IR spectroscopy. The results indicated the final product was a copolymer instead of a blend or a composite. The physical properties were systematically investigated by cyclic voltammetry, UV-vis absorption and fluorescence. The PL maximum of copolymers presented obviously red-shift to long wavelength as the feed ratio of EDOT in monomer mixture increased.

Preparation and Characterization of Cefradine/Montmorillionite Composites

2012 ◽  
Vol 560-561 ◽  
pp. 434-437 ◽  
Author(s):  
Lan Wang ◽  
Wen Ji Guo ◽  
Yan Zhao Zhao
Keyword(s):  
Gastric Fluid ◽  
Simulated Gastric Fluid ◽  
X Ray Diffraction ◽  
Simulated Intestinal Fluid ◽  
Solution Intercalation ◽  
Method Of Solution ◽  
Ft Ir ◽  
In The Beginning ◽  
Ft Ir Spectroscopy

The objective of this paper was to prepare the composite of crefradine/montmorillionite in the method of solution intercalation. The drug load and intercalation rate varied with the drug concentration. X-ray diffraction (XRD), Fourier transformed infrared (FT-IR) Spectroscopy, and thermal analysis (TG-DSC) were applied to characterize composite mentioned above. Together with drug release tests, results indicate cefradine intercalated into montmorillionite.The release profiles of cefradine/MMT in simulated gastric fluid (pH 1.2) and simulated intestinal fluid (pH 7.4) at 37°Cduring 10h are shown in Fig. 4. The amount of cefradine in the beginning 2h came up to 35% and 50%, and in the following time, cefradine released slowly. The release behaviors met the requirements of sustained release.

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