• Stable isotope ratios are measured using mass spectrometry, which separates the different isotopes of an element on the basis of their mass-to-charge ratio. (wikipedia.org)
  • Carbon isotope ratios can also be used to distinguish between marine, freshwater, and terrestrial food sources. (wikipedia.org)
  • Carbon isotope ratios can be measured in bone collagen or bone mineral (hydroxylapatite), and each of these fractions of bone can be analysed to shed light on different components of diet. (wikipedia.org)
  • The analysis of these relatively conventional trace element ratios in the shells of an oxygen minimum zone species has tremendous potential to facilitate multiproxy reconstructions from this enigmatic environment. (frontiersin.org)
  • While traditional stable isotope analyses of tooth enamel (e.g., carbon and oxygen) and trace element ratios (e.g. (blueskytccaalibaba.com)
  • In this way, the researchers were also able to determine the zinc isotope ratios of megalodon teeth from the early Pliocene (5.3 to 3.6 million years ago) and of great white sharks living then and now in order to get indications about the interactions that might occur there. (thewestonforum.com)
  • Nitrogen isotopes can be used to infer soil conditions, with enriched δ15N used to infer the addition of manure. (wikipedia.org)
  • In this study, we show that the nitrogen isotope composition of organic matter preserved in mammalian tooth enamel (δ 15 N enamel ) records diet and trophic position. (blueskytccaalibaba.com)
  • In contrast, the nitrogen (N) isotope ratio of organic material (expressed as δ 15 N vs. AIR in ‰, where δ 15 N = [( 15 N/ 14 N sample / 15 N/ 14 N reference ) − 1] × 1000) derived from bulk tissues or specific compounds (e.g., amino acids) is a widely used proxy for the dietary and trophic behavior of animals in terrestrial and marine food webs. (blueskytccaalibaba.com)
  • Despite the potential of nitrogen isotopes for trophic reconstruction, their application in the paleontological record has been limited due to the poor preservation of N-containing organic matter. (blueskytccaalibaba.com)
  • Because it now represents an important addition to the nitrogen isotope analyzes of dental collagen, which previously provided conclusions about diets. (thewestonforum.com)
  • The protein collagen found in bone and teeth, which is required for these analyzes, is difficult to preserve long-term, so traditional nitrogen isotope analysis is often not possible," McCormack says. (thewestonforum.com)
  • Carbon isotopes are analysed in archaeology to determine the source of carbon at the base of the foodchain. (wikipedia.org)
  • However, in addition to carbon, other elements such as oxygen in the nature also have natural stable isotopes (e.g., 17O, 18O). (biomed.news)
  • Examining the 12C/13C isotope ratio, it is possible to determine whether animals and humans ate predominantly C3 or C4 plants. (wikipedia.org)
  • The team analyzed the ratio of stable zinc isotopes in the teeth of modern and fossil sharks from around the world, including megalodon sharks and modern and fossilized great white sharks. (thewestonforum.com)
  • A random effects meta-analysis was conducted to determine the strength of the association in the form of an odds ratio (OR) and subsequently the population attributable risk (PAR) with population prevalences of high FPG. (groundworkhealth.org)
  • Isotope analysis is the identification of isotopic signature, abundance of certain stable isotopes of chemical elements within organic and inorganic compounds. (wikipedia.org)
  • Isotopic analysis can be used to understand the flow of energy through a food web, to reconstruct past environmental and climatic conditions, to investigate human and animal diets, for food authentification, and a variety of other physical, geological, palaeontological and chemical processes. (wikipedia.org)
  • As such, isotopic analysis makes use of the more resistant phosphate groups, rather than the less abundant hydroxyl group or the more likely diagenetic carbonate groups present. (wikipedia.org)
  • A wide range of archaeological materials such as metals, glass and lead-based pigments have been sourced using isotopic characterization. (wikipedia.org)
  • For the first time, we were able to extract Conclusions about the diet of these animals based on zinc isotope fingerprints in the highly mineralized enamel crown of fossil shark teeth. (thewestonforum.com)
  • The organic matter in bone and dentin is, as a result, susceptible to diagenetic alteration, particularly in unfavorable depositional contexts (e.g., humid environments and acidic soils). (blueskytccaalibaba.com)
  • analytical chemistry, the analysis of material samples to gain an understanding of their chemical composition and structure. (crystalinks.com)
  • These studies, together with a detailed study of stable isotope composition, were carried out at Lomonosov Moscow State University (Yu. (aurora-journals.com)
  • In addition, favourable results of recently developed bioassays, coupled with an important variability of local assemblages under changing conditions in both waters and sediments, suggest that these microcrustaceans may included between the most promising sentinels groups in freshwater areas. (springer.com)
  • It is also important for the researcher to know the variations of isotopes within individuals, between individuals, and over time. (wikipedia.org)
  • The purpose of this study is to quantitatively evaluate intra-batch variations or injection order effects of the RP-LC, HILIC, and IP-LC methods for targeted metabolomics analyses, and develop strategies to minimize intra-batch variations and correct injection order effects for problematic metabolites. (biomed.news)
  • For large-scale and long-term metabolomics studies that involve a large batch or multiple batches of analyses, batch effects cause nonbiological systematic biases that may lead to false positive or false negative findings. (biomed.news)
  • A systematic review and meta-analysis was conducted to determine whether ZD was associated with fasting plasma glucose (FPG), a key risk factor for NCDs. (groundworkhealth.org)
  • Interpretation of lead isotope data is, however, often contentious and faces numerous instrumental and methodological challenges. (wikipedia.org)
  • Advances in geophysical monitoring and quantitative interpretation of geophysical survey results are presented, especially for ground ice and water content. (uspermafrost.org)
  • To investigate this topic, we systematically identified pairs of population-based surveys that measured haemoglobin in the same population of women of reproductive age (WRA) or preschool-aged children (PSC). (groundworkhealth.org)
  • Particularly in the Bronze Age Mediterranean, lead isotope analysis has been a useful tool for determining the sources of metals and an important indicator of trade patterns. (wikipedia.org)
  • The use of maximum pseudolikelihood in generalized linear mixed models for the analysis of replicated spatial point patterns. (arizona.edu)
  • In this study, an electromagnetic isotope separation technique was applied after neutron irradiation to boost the specific activity by separating 169 Er from 168 Er targets. (frontiersin.org)
  • A study now provides new evidence that the smaller but more adaptable great white shark snatched food from its giant relative: Comparisons of zinc isotope fingerprints in the fossil teeth of both shark species indicate that they hunted similar prey and were thus food competitors. (thewestonforum.com)
  • As part of their study, the researchers have now discovered to what extent zinc isotope fingerprints allow conclusions to be drawn about the sharks' diet. (thewestonforum.com)
  • Isotope analysis has been particularly useful in archaeology as a means of characterization. (wikipedia.org)
  • Her research focus is statistical methods for handling missing data in individual and cluster randomized trials, and the design and analysis of studies using patient reported outcomes. (arizona.edu)
  • To achieve sufficient retention and separation of a broad range of metabolites with diverse chemical structures and physicochemical properties, LC-MS/MS based targeted metabolomics often involves 3 complemented chromatographic separation methods, including reversed-phase liquid chromatography (RP-LC), hydrophilic interaction liquid chromatography (HILIC), and ion-pair liquid chromatography (IP-LC). (biomed.news)
  • Targeted proteomics analysis of the prioritized proteins in saliva, combined with machine-learning methods, highlights a peptide-based signature as the most powerful predictor to distinguish patients with and without lymph node metastasis. (nature.com)
  • Previous studies have observed that haemoglobin concentrations can be affected by type of blood collection, analysis methods and device, and that near-in-time population-based surveys report substantially different anaemia prevalence. (groundworkhealth.org)
  • Stable isotope 13C labeling is an important tool to analyze cellular metabolic flux. (biomed.news)
  • Quantitative monitoring and correction of batch effects is critical to the development of reproducible and robust metabolomics platforms either for untargeted or targeted analyses. (biomed.news)
  • Our results provide the first account of metal concentrations in Bahamian sharks, suggesting individuals exhibit high concentrations which may potentially cause sublethal effects. (researchgate.net)
  • She examined the effects of zinc (Zn) isotopes in the teeth of fossil sharks. (thewestonforum.com)
  • However, it was suggested that a so-called specific difference between the hyperfine splittings in hydrogen-like and lithium-like ions of the same isotope can be used to cancel nuclear structure effects and provide an accurate test of QED [Shabaev et al. (fnal.gov)
  • The method employed a basic power method for constructing the correction matrix with simple structure and easy coding implementation, which can be directly applied to data pre-processing in 13C metabolic flux analysis. (biomed.news)
  • The results showed that the proposed method was accurate and effective, which can serve as a reliable data correction method for accurate microbial intracellular metabolic flux analysis. (biomed.news)
  • Isotope analysis has widespread applicability in the natural sciences. (wikipedia.org)
  • In this paper, we proposed a method for construction of correction matrix based on Python language for correcting the measurement errors due to natural isotope distribution. (biomed.news)
  • Subsequent precipitation of colloidal Pt by bacteria complete the cycle, creating 'exploration targets' that could improve our ability to track its movement in natural systems, i.e., focusing on the recovery and analysis of nanoparticles as a strategy to search for new, undiscovered sources of this precious metal. (mdpi.com)
  • This strengthens our confidence in the analysis method," says co-author Sora Kim from the University of California, Merced. (thewestonforum.com)
  • What is remarkable is that the zinc isotope values ​​of the early Pliocene sharks from North Carolina indicate that the nutritional levels of the early great white sharks and the much larger megalodon overlapped quite a bit," says co-author Michael Griffiths of William Patterson University in Wayne. (thewestonforum.com)
  • Our results suggest at least some overlap in the prey caught by both types of sharks," adds his colleague Kensho Shimada of DePaul University in Chicago. (thewestonforum.com)
  • I will present recent results of extended grids of nucleosynthesis of stars of low metallicity. (cern.ch)
  • Non-communicable diseases (NCDs) account for the largest share of the global disease burden, and increasing evidence shows that zinc deficiency (ZD) contributes to NCDs by inducing oxidative stress, insulin resistance, and impaired lipid metabolism. (groundworkhealth.org)
  • Ion traps are of growing popularity at rare-isotope-beam facilities due to their textbook-like conditions and tailorability. (fnal.gov)
  • The correction method was then applied to the intracellular metabolic flux analysis of 13C-labeled Aspergillus niger. (biomed.news)
  • The method was established based on the stable isotope-dilution liquid chromatography-tandem mass spectroscopy (ID-LC-MS/MS) technique. (biomed.news)
  • Histopathological-based models may be used to stratify patients into low- and high-risk classes 9 and further identify patients at risk of aggressive early-stage OSCC, thus contributing to disease predictability in terms of clinical progression and treatment outcomes. (nature.com)
  • Relating in vitro to in vivo exposures with physiologically based tissue dosimetry and tissue response models. (cdc.gov)
  • Results can be applied to both evaluations of biotic changes produced by anthropogenic activities or palaeoecological/archaeological interpretations using sediment cores. (springer.com)
  • Design of the Arizona CoVHORT: A Population-Based COVID-19 Cohort. (arizona.edu)
  • 1987. Physiologically based pharmacokinetics and the risk assessment process for methylene chloride. (cdc.gov)