Cluster analysis of protein fourier transform infrared spectra

Biopolymers ◽  
1988 ◽  
Vol 27 (11) ◽  
pp. 1831-1838 ◽  
Author(s):  
Alan H. Lipkus ◽  
Thomas J. Lenk ◽  
Krishnan K. Chittur ◽  
R. Michael Gendreau
Keyword(s):  
Cluster Analysis ◽  
Fourier Transform ◽  
Infrared Spectra ◽  
Fourier Transform Infrared ◽  
Fourier Transform Infrared Spectra

Pre-processing of Fourier transform infrared spectra by means of multivariate analysis implemented in the R environment

The Analyst ◽  
2015 ◽  
Vol 140 (8) ◽  
pp. 2810-2814 ◽  
Author(s):  
Krzysztof Banas ◽  
Agnieszka Banas ◽  
Mariusz Gajda ◽  
Bohdan Pawlicki ◽  
Wojciech M. Kwiatek ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Multivariate Analysis ◽  
Fourier Transform ◽  
Infrared Spectra ◽  
Hierarchical Cluster Analysis ◽  
Traditional Approach ◽  
Hierarchical Cluster ◽  
Fourier Transform Infrared ◽  
Average Intensity ◽  
Fourier Transform Infrared Spectra

Segmentation of the hyperspectral dataset by using hierarchical cluster analysis shows its advantage over the traditional approach based on the average intensity.

Synthesis, characterization, and their some chemical and biological properties of PVA/PAA/nPS hydrogel nanocomposites: Hydrogel and wound dressing

2020 ◽  
Vol 35 (3) ◽  
pp. 203-215
Author(s):  
Mehmet Emin Diken ◽  
Berna Koçer Kizilduman ◽  
Begümhan Yilmaz Kardaş ◽  
Enes Emre Doğan ◽  
Mehmet Doğan ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Acrylic Acid ◽  
Infrared Spectra ◽  
Vinyl Alcohol ◽  
Fourier Transform Infrared ◽  
Poly Vinyl Alcohol ◽  
Seed Particles ◽  
Fourier Transform Infrared Spectra ◽  
Hydrogel Nanocomposites ◽  
Poly Acrylic Acid

The nanocomposite hydrogels were prepared by dispersing of the nanopomegranate seed particles into poly(vinyl alcohol)/poly(acrylic acid) blend matrix in an aqueous medium by the solvent casting method. These hydrogels were characterized using scanning electron microscopy, Fourier transform infrared spectra, differential scanning calorimetry, and optical contact angle instruments. The nanopomegranate seed, blend, and hydrogel nanocomposites were tested for microbial activity. In addition, cytocompatibilities of these blend and hydrogel nanocomposites/composites were tested on human lymphocyte with in vitro MTS cell viability assays. Fourier transform infrared spectra revealed that esterification reaction took place among functional groups in the structure of poly(vinyl alcohol) and poly(acrylic acid). The hydrophilic properties of all hydrogels decreased with increasing nanopomegranate seed content. The mean diameters of the nanopomegranate seed particles were about 88 nm. Nanopomegranate seed particles demonstrated antibacterial properties against gram-positive bacteria, Staphylococcus aureus, and gram-negative bacteria, Escherichia coli. The lymphocyte viabilities increased after addition of nanopomegranate seeds into the polymer blend. The swelling behavior of blend and hydrogels was dependent on the cross-linking density created by the reaction between poly(vinyl alcohol)/poly(acrylic acid) blend and nanopomegranate seed. Scanning electron microscopy images were highly consistent with Fourier transform infrared spectra, differential scanning calorimetry, and antibacterial activity results.

Band Shape Analysis of Fourier Transform Infrared Spectra

1982 ◽  
Vol 36 (4) ◽  
pp. 401-404 ◽  
Author(s):  
P. C. Gillette ◽  
J. B. Lando ◽  
J. L. Koenig
Keyword(s):  
Fourier Transform ◽  
Shape Analysis ◽  
Infrared Spectra ◽  
Goodness Of Fit ◽  
Nonlinear Least Squares ◽  
Fourier Transform Infrared ◽  
Quantitative Information ◽  
Band Shape ◽  
Fourier Transform Infrared Spectra ◽  
Overlapping Peaks

The application of a finite difference Levenberg-Marquardt nonlinear least-squares procedure for the resoluton of overlapping peaks in Fourier transform-infrared spectra is described. Starting estimates of peak parameters utilized in the refinement are obtained from a numerically approximated second derivative spectrum which has been smoothed. Quantitative information reflecting the constituent peaks and the “goodness of fit” is displayed graphically in a procedure requiring much less than 1 min to both initiate and obtain results in a form that is readily interpreted.

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