Results 201 to 210 of about 4,516,287 (245)

Protein Stable Isotope Fingerprinting: Multidimensional Protein Chromatography Coupled to Stable Isotope-Ratio Mass Spectrometry

Analytical Chemistry, 2014
Protein stable isotope fingerprinting (P-SIF) is a method to measure the carbon isotope ratios of whole proteins separated from complex mixtures, including cultures and environmental samples. The goal of P-SIF is to expose the links between taxonomic identity and metabolic function in microbial ecosystems.
Mohr, W., Tang, T., Sattin, S., Bovee, R., Pearson, A.   +4 more
openaire   +3 more sources

Stable isotope ratio analysis in human hair

2011
Stable isotope ratio analysis of human hair has the potential to provide a wealth of information about nutritional status, metabolism and disease states. While applications are relatively new in clinical nutrition and metabolic studies, the study of natural isotope abundances in hair have been routinely applied to archaeological and ecological research
Klaus J Petzke, Benjamin T Fuller
openaire   +1 more source

The Stable Isotope Ratios of Marijuana. II. Strontium Isotopes Relate to Geographic Origin

Journal of Forensic Sciences, 2009
Abstract:  Effectively addressing marijuana trade is aided by understanding marijuana geographic sources. We analyzed the 87Sr/86Sr of marijuana samples grown in 79 counties across the United States to determine if a primary geologic signal is retained in marijuana, which could therefore be useful for geographic sourcing.
Jason B, West, Janet M, Hurley, Francis O, Dudás, James R, Ehleringer   +3 more
openaire   +2 more sources

Application of stable isotope ratio analysis for biodegradation monitoring in groundwater

Current Opinion in Biotechnology, 2013
Stable isotope ratio analysis is increasingly being applied as a tool to detect, understand, and quantify biodegradation of organic and inorganic contaminants in groundwater. An important feature of this approach is that it allows degradative losses of contaminants to be distinguished from those caused by non-destructive processes such as dilution ...
Paul B, Hatzinger, J K, Böhlke, Neil C, Sturchio   +2 more
openaire   +2 more sources

Stable Isotope Ratio Analysis for Authenticity Control

2017
This chapter summarizes terms, definitions, and reference materials used for stable isotope ratio analysis (SIRA ) of the bioelements hydrogen, carbon, and oxygen. The principles of biotic and abiotic fractionation in biomolecules like flavor compounds are explained. A short review of the common methods for the determination of isotope ratios \(\mathrm{
Norbert Christoph, Antje Schellenberg, Wiebke Zander, Gerhard Krammer   +3 more
openaire   +1 more source

Stable isotopic ratios of lead in surface waters of the Central Pacific

Marine Chemistry, 1984
The geographic variation in the isotopic composition of lead in surface waters of the central Pacific provides new evidence of the global anthropogenic perturbation of the element's cycle. Ratios of ^(206)Pb/^(207)Pb decrease from 1.196 in the northern hemisphere (19°N, 158°W) to 1.176 in the southern hemisphere (15°S, 150°W).
Flegal, A. R., Schaule, B. K., Patterson, C. C.   +2 more
openaire   +2 more sources

Heavy element stable isotope ratios : analytical approaches and applications

Analytical and Bioanalytical Chemistry, 2013
Continuous developments in inorganic mass spectrometry techniques, including a combination of an inductively coupled plasma ion source and a magnetic sector-based mass spectrometer equipped with a multiple-collector array, have revolutionized the precision of isotope ratio measurements, and applications of inorganic mass spectrometry for biochemistry ...
Masaharu, Tanimizu, Yoshiki, Sohrin, Takafumi, Hirata   +2 more
openaire   +2 more sources

Stable isotope ratio as a tracer of mangrove carbon in Malaysian ecosystems

Oecologia, 1984
The ratio of stable carbon isotopes (δ13C) in plants and animals from Malaysian mangrove swamps, coastal inlets, and offshore waters was determined. Vascular plants of the swamps were isotopically distinct ( x±s.d.=-27.1±1.2‰) from plankton (-21.0±0.3‰) and other algae (-18.7±2.2‰).
Rodelli, M.R., Gearing, J.N., Gearing, P.J., Marshall, N., Sasekumar, A.   +4 more
openaire   +3 more sources

Stable hydrogen and oxygen isotope ratios of bottled waters of the world

Rapid Communications in Mass Spectrometry, 2005
Abstract Bottled and packaged waters are an increasingly significant component of the human diet. These products are regulated at the regional, national, and international levels, and determining the authenticity of marketing and labeling claims represents a challenge to regulatory agencies.
Gabriel J, Bowen, David A, Winter, Howard J, Spero, Robert A, Zierenberg, Mathew D, Reeder, Thure E, Cerling, James R, Ehleringer   +6 more
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DETERMINATION OF STABLE ISOTOPE RATIOS IN FOOD ANALYSIS

Food Reviews International, 2001
Within the last few years, stable isotope analysis has gained increasing importance in authenticity control of food and food ingredients. The development of the methodology from its start in the geological sciences is reviewed, the requirements and the specific features of the technique in the area of food quality assessment are outlined, and the ...
openaire   +1 more source