نتایج جستجو برای: infrared ir spectra

تعداد نتایج: 256750  

Journal: :Applied spectroscopy 2007
Carmen-Mihaela Popescu Maria-Cristina Popescu Ghita Singurel Cornelia Vasile Dimitris S Argyropoulos Stefan Willfor

The main difficulties in wood and pulp analyses arise principally from their numerous components with different chemical structures. Therefore, the basic problem in a specific analytical procedure may be the selective separation of the main carbohydrate-derived components from lignin due to their chemical association and structural coexistence. The processing of the wood determines some structu...

Ahmad Noori, Arash Akbarzadeh, Morteza Yousefzadi, Zohreh Rahimi,

The present study focused on the synthesis of silver nanoparticles using the aqueous extract of Ulva flexousa (green seaweed). Ten ml of the aqueous extract of alga was mixed with 90 ml of 1mM aqueous AgNO3 solution for reducing of Ag+ ions. The synthesized silver nanoparticles were characterized by UV-Vis spectra, XRD (X-ray diffraction), TEM (Transmission electron microscopy) and FT-IR (Fouri...

Journal: :Applied spectroscopy 2011
Richard W Hendler Curtis W Meuse Mark S Braiman Paul D Smith John W Kakareka

We have used new kinetic fitting procedures to obtain infrared (IR) absolute spectra for intermediates of the main bacteriorhodopsin (bR) photocycle(s). The linear-algebra-based procedures of Hendler et al. (J. Phys. Chem. B, 105, 3319-3228 (2001)) for obtaining clean absolute visible spectra of bR photocycle intermediates were adapted for use with IR data. This led to isolation, for the first ...

2015
Cosima Koch Markus Brandstetter Patrick Wechselberger Bettina Lorantfy Maria Reyes Plata Stefan Radel Christoph Herwig Bernhard Lendl

This article presents a novel method for selective acquisition of Fourier transform infrared (FT-IR) spectra of microorganisms in-line during fermentation, using Saccharomyces cerevisiae as an example. The position of the cells relative to the sensitive region of the attenuated total reflection (ATR) FT-IR probe was controlled by combing a commercially available ATR in-line probe with contact-f...

2017
Ionela Raluca Comnea-Stancu Karin Wieland Georg Ramer Andreas Schwaighofer Bernhard Lendl

This work was sparked by the reported identification of man-made cellulosic fibers (rayon/viscose) in the marine environment as a major fraction of plastic litter by Fourier transform infrared (FT-IR) transmission spectroscopy and library search. To assess the plausibility of such findings, both natural and man-made fibers were examined using FT-IR spectroscopy. Spectra acquired by transmission...

2016
Ionela Raluca Comnea-Stancu Karin Wieland Georg Ramer Andreas Schwaighofer Bernhard Lendl

This work was sparked by the reported identification of man-made cellulosic fibers (rayon/viscose) in the marine environment as a major fraction of plastic litter by Fourier transform infrared (FT-IR) transmission spectroscopy and library search. To assess the plausibility of such findings, both natural and man-made fibers were examined using FT-IR spectroscopy. Spectra acquired by transmission...

2016
Andreas Schwaighofer Mirta R. Alcaráz Can Araman Héctor Goicoechea Bernhard Lendl

Fourier transform infrared (FTIR) and circular dichroism (CD) spectroscopy are analytical techniques employed for the analysis of protein secondary structure. The use of CD spectroscopy is limited to low protein concentrations (<2 mg ml(-1)), while FTIR spectroscopy is commonly used in a higher concentration range (>5 mg ml(-1)). Here we introduce a quantum cascade laser (QCL)-based IR transmis...

Journal: :The journal of physical chemistry. A 2010
Zhi Ji Rubén Santamaria Ignacio L Garzón

With density functional theory, vibrational circular dichroism (VCD) and infrared absorption (IR) spectra are obtained at the B3LYP/CC-pVTZ level of theory for 20 alpha-amino acids. The contribution of different vibration modes to the IR and VCD spectra is analyzed. Overall agreement between calculated results for amino acids in gas phase with the available experimental VCD data for matrix-assi...

Journal: :jundishapur journal of natural pharmaceutical products 0
kamran mousavi hosseini department of biotechnology, blood transfusion research center, high institute for research and education in transfusion medicine, tehran, ir iran; department of biotechnology, blood transfusion research center, high institute for research and education in transfusion medicine, p. o. box: 14665-1157, tehran, ir iran. tel: +98-2182052160, fax: +98-88601555 mohammad ali jalili department of biochemistry, blood transfusion research center, high institute for research and education in transfusion medicine, tehran, ir iran

background antioxidant compounds have been shown to slow down the development of chemically induced tumors. it has been estimated that most of human cancer cases are due to environmental factors and would be preventable if the main risks could be identified. the potential of vitamin e as a cancer preventive agent has been studied and individuals whose intake of vitamin e was above average showe...

Journal: :The Analyst 2015
Holly J Butler Simon W Fogarty Jemma G Kerns Pierre L Martin-Hirsch Nigel J Fullwood Francis L Martin

As biospectroscopy techniques continue to be developed for screening or diagnosis within a point-of-care setting, an important development for this field will be high-throughput optimization. For many of these techniques, it is therefore necessary to adapt and develop parameters to generate a robust yet simple approach delivering high-quality spectra from biological samples. Specifically, this ...

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