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Detection of Oral Fluid Stains on Fabric via Solution Extraction Combined with Deep Ultraviolet Raman Spectroscopy.
Anal Chem
January 2025
Department of Chemistry, University at Albany, SUNY, 1400 Washington Avenue, Albany, New York 12222, United States.
DNA phenotyping plays a central role in modern practical forensics, yet an overwhelming amount of evidence creates significant backlogs in all major crime laboratories. A fast nondestructive test of a potential biological stain prior to DNA phenotyping should reduce the number of irrelevant samples for the analysis and increase the efficiency of the overall process. Evidence items recovered from the crime scene can often include body fluid traces, such as oral fluid (OF).
View Article and Find Full Text PDFIdentification of Flavonoids Using UV-Vis and MS Spectra.
Methods Mol Biol
January 2025
Plant Sciences, Institute of Biology, Leiden University, Leiden, The Netherlands.
Flavonoids are a group of specialized metabolites that are ubiquitously found within the plant kingdom. While they fulfill various important functions within the plant, they are also utilized by humans in a variety of different fields such as medicine, food science, and agriculture. Thus, to elucidate the chemical composition of any given plant extract, extraction and identification of flavonoids are of high interest.
View Article and Find Full Text PDFThe ability to accurately express and compute the absorption spectrum is critically important for measuring the composition and concentration of substances. In this study, we present a method that reconstructs the original spectra into new spectra with linear features based on absorption intensity to improve the analysis of spectral data. The transformation matrix and mapping relationship are calculated based on the absorption intensity of the spectral data.
View Article and Find Full Text PDFWe present the subcycle spectral structures from attosecond transient absorption spectra of helium by accurately solving the full three-dimensional time-dependent Schrödinger equation in extreme ultraviolet attosecond pulse and an orthogonally polarized infrared (IR) laser field. We discover that the subcycle spectral features associated with the dressed 1 ( ≥ 4) states and light-induced states, referred to as , , and , can be strongly modified or even enhanced when the strength ratio of the orthogonal laser field in two polarized laser directions changes. To understand the spectral evolution of the subcycle structures, we perform calculations of the time-dependent population and time-frequency analysis.
View Article and Find Full Text PDFPhotochemical Evolution of Alanine in Association with the Martian Soil Analog Montmorillonite: Insights Derived from Experiments Conducted on the International Space Station.
Astrobiology
January 2025
Experimental Biophysics and Space Sciences, Department of Physics, Freie Universitaet Berlin, Berlin, Germany.
The (PSS) experiment was part of the European Space Agency's mission and was conducted on the International Space Station from 2014 to 2016. The PSS experiment investigated the properties of montmorillonite clay as a protective shield against degradation of organic compounds that were exposed to elevated levels of ultraviolet (UV) radiation in space. Additionally, we examined the potential for montmorillonite to catalyze UV-induced breakdown of the amino acid alanine and its potential to trap the resulting photochemical byproducts within its interlayers.
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