• The findings are confronted with the conclusions of stable carbon and nitrogen isotope analyses of human bones. (profil-archeo.pl)
  • Stable carbon and nitrogen isotope ratios (δ 13 C/δ 15 N) in the bone collagen and other hard tissues of marine species serve as proxies for primary productivity and food web interactions. (frontiersin.org)
  • Objective -To compare cardiac output (CO) measured by use of the partial carbon dioxide rebreathing method (NICO) or lithium dilution method (LiDCO) in anesthetized foals. (avma.org)
  • Procedures -Foals were anesthetized and instrumented to measure direct blood pressure, heart rate, arterial blood gases, end-tidal isoflurane and carbon dioxide concentrations, and CO. Various COs were achieved by administration of dobutamine, norepinephrine, vasopressin, phenylephrine, and isoflurane to allow comparisons between LiDCO and NICO methods. (avma.org)
  • Sample management, chemical pretreatments, conversions to carbon dioxide (Elemental Analyzer Flash 2000NC or acid release) and to carbon (Helsinki Adaptive Sample prEparation line - HASE) are performed at the Laboratory of Chronology and Accelerator Mass Spectrometric (AMS) analyses are provided by the Helsinki AMS facility at the Department of Physics. (luomus.fi)
  • Infrared spectrometry allowed the detection of gaseous nitrogen- trichloride (10025851) in atmospheres low in carbon-dioxide. (cdc.gov)
  • Under atmospheric levels of carbon-dioxide, the nitrogen-trichloride absorbance band was completely obscured by carbon-dioxide sidebands. (cdc.gov)
  • Carbon dioxide levels also may be monitored, since patients with prior lung disease such as asthma and chronic obstructive pulmonary disease may be affected more severely and are at greater risk to retain carbon dioxide. (medscape.com)
  • 60 mm Hg in room air) or hypercarbia (alveolar [arterial] carbon dioxide pressure [PaCO 2 ] level of 55 mm Hg) indicate significant respiratory insufficiency. (medscape.com)
  • Acid-Base Disorders Acid-base disorders are pathologic changes in carbon dioxide partial pressure (Pco2) or serum bicarbonate (HCO3 − ) that typically produce abnormal arterial pH values. (msdmanuals.com)
  • Respiratory acidosis is carbon dioxide (CO 2 ) accumulation (hypercapnia) due to a decrease in respiratory rate and/or respiratory volume (hypoventilation). (msdmanuals.com)
  • carbon dioxide is initially buffered inefficiently, but over 3 to 5 days the kidneys increase bicarbonate reabsorption significantly. (msdmanuals.com)
  • Pollutants of major public health concern include particulate matter, carbon monoxide, ozone, nitrogen dioxide and sulfur dioxide. (who.int)
  • In this work, technetium-99 ( 99m Tc) was used as the radiolabeling isotope to study the biodistribution of oxidized multi-walled carbon nanotubes (oMWCNTs) and/or nanodiamonds (NDs) in mice after intravenous administration. (springer.com)
  • The results showed that carbon nanotubes could affect strongly the biodistribution of oxidized graphene, but oxidized graphene could not affect the biodistribution of carbon nanotubes. (springer.com)
  • Multi-walled carbon nanotubes (MWCNTs) prepared by chemical vaporization deposition were commercially obtained from Shenzhen Nanotech Port Co. Ltd., Guangdong, China. (springer.com)
  • This chapter presents the results of experimental studies of the electrical, mechanical and geometric parameters of vertically aligned carbon nanotubes (VA CNTs) using scanning probe microscopy (SPM). (intechopen.com)
  • The results can be used in the development of diagnostic methods as well as in nanoelectronics and nanosystem devices based on vertically aligned carbon nanotubes (memory elements, adhesive structures, nanoelectromechanical switches, emission structures, etc. (intechopen.com)
  • To modify the electrode, paraffin oil and multi-walled carbon nanotubes (MWCNT) were used as binder and modifier respectively. (jwent.net)
  • In this work the coupling between carbon foam and composite materials made of carbon nanotubes and epoxy-resin allows to build a material able to absorb the electromagnetic field thus reducing its intensity in the environment where the mitigation of electromagnetic field is required. (scirp.org)
  • Two different kind of heterogeneous materials are designed, one is a layered radar absorbing material made exclusively of epoxy resin and carbon nanotube in different weight percentage, the others are porous carbon foam where the pores are supposed be filled with carbon nanotubes and epoxy-resin. (scirp.org)
  • AMS radiocarbon age determinations of bone. (ahobproject.org)
  • Radiocarbon, stable isotopic and luminescence techniques provide tools to quantify and characterize natural and manmade samples ranging from last glacial era to Anthropocene. (luomus.fi)
  • Radiocarbon determinations are performed through Radiocarbon Analytics Finland (RACAF) organization merging together the radiocarbon expertise within the University of Helsinki. (luomus.fi)
  • Particularly, biobased carbon content determinations using radiocarbon method are available for liquid and solid materials (fuels, plastics, bioproducts) following the ASTM D6866 standard. (luomus.fi)
  • Wood anatomical analyses of small samples, such as charcoal fragments, are also performed at the laboratory, and microscopic analyses for species determination can be combined with age determination at the radiocarbon dating laboratory , which is also hosted by the Department of Geology. (lu.se)
  • Eelgrass (Zostera marina) characteristics, sediment grain size distributions, sediment total organic carbon contents (TOC), carbon isotope ratios of sediment organic matter, and total carbon to total nitrogen ratios were measured at four lower intertidal sites in Bellingham Bay, Washington, July 2-5, 2019. (usgs.gov)
  • Historically, this field started as early as the 1930s, when a custom-made mass spectrometer was constructed to measure subtle differences in the isotopic ratios of natural carbon (Nier and Gulbransen 1939 ). (springeropen.com)
  • Our lab work encompasses the targeted detection of specialized ("secondary") plant and fungal metabolites like terpenes and alkaloids in archaeological artifacts, identification of fecal biomarkers from soil and lake biogeochemical records, and determination of carbon and nitrogen stable isotope ratios in amino acids across various organic samples. (mpg.de)
  • The exhaust gases produced by a generator contain deadly carbon monoxide, and that is yet another consideration for location. (gucbirjenerator.com)
  • Pulse oximetry readings can be misleading in the setting of carbon monoxide (CO) exposure or methemoglobinemia because these devices use only 2 wavelengths of light (the red and the infrared spectrum), which detect oxygenated and deoxygenated hemoglobin only and not any other form of hemoglobin. (medscape.com)
  • In addition to all the benefits mentioned, the use of modifiers that effectively accelerate and facilitates the electron transport between the analyte and the electrode has made the modified carbon paste electrodes a suitable candidate for simultaneous measurement of the analytes by reducing the overpotential required for the electrode reactions [ 13 , 14 ]. (biomedcentral.com)
  • Modified carbon paste electrodes are simple and selective tools for the determination of heavy metal ions that have been extensively developed in recent years. (jwent.net)
  • The operation mechanism of such modified carbon paste electrodes depends on the properties of the modifier materials used to import selectivity towards the target species [13]. (jwent.net)
  • We offer stable isotope analyses mostly for scientific research projects. (luomus.fi)
  • The aim of this work is to introduce a potentiometric carbon paste electrode (PCPE) for Hg 2+ determination based on its complexation reaction with 3-((3-mercaptophenyl) aminomethyl)benzene-1,2-diol, L as an excellent ion carrier with N, O and S as donor atoms. (jwent.net)
  • The new synthetic ligand, L, then mixed with graphite powder, MWCNTs and paraffin oil for constructing of a selective CPE sensor to the potentiometric determination of Hg 2+ in environmental water samples. (jwent.net)
  • Very large PAHs containing up to hundreds of carbon atoms are expected to be present and stable in the interstellar medium. (europa.eu)
  • Ratio of carbon atoms/nitrogen atoms. (noaa.gov)
  • Here we show the unambiguous isotopic imaging of 12 C carbon atoms embedded in 13 C graphene and the monitoring of their self-diffusion via atomic-level vibrational spectroscopy. (nature.com)
  • We first grow a domain of 12 C carbon atoms in a pre-existing crack of 13 C graphene, which is then annealed at 600 degrees Celsius for several hours. (nature.com)
  • Our results demonstrate the high mobility of carbon atoms during growth and annealing via self-diffusion. (nature.com)
  • Fig. 4: Self-diffusion of carbon atoms in graphene. (nature.com)
  • A simple and precise analytical approach developed for single and simultaneous determination of resorcinol (RC) and hydroquinone (HQ) in pharmaceutical samples using carbon paste electrode (CPE) modified with 1-Ethyl-3-methylimidazolium tetrafluoroborate as ionic liquid and ZnFe 2 O 4 nanoparticle. (biomedcentral.com)
  • The electrochemical property of a recently synthesized ligand, 3-((3-mercaptophenyl) aminomethyl)benzene-1,2-diol has been investigated with construction of a modified carbon paste electrode to find out of mercury ions in real samples. (jwent.net)
  • The proposed modified carbon paste electrode was successfully applied to the determination of mercury ions in real water samples. (jwent.net)
  • A Jenway (USA) model 3020 pH meter with a combined glass electrode was used after calibration against standard Merck buffers for pH determinations. (jwent.net)
  • The SISAL database: a global resource to document oxygen and carbon isotope records from speleothems. (uni-mainz.de)
  • Grossman EL, Ku TL (1986) Oxygen and carbon isotope fractionation in biogenic aragonite: temperature effects. (springer.com)
  • Nelson CS, Northcote TG, Hendy CH (1989) Potential use of oxygen and carbon isotopic composition of otoliths to identify migratory and non-migratory stocks of the New Zealand common smelt: a pilot study. (springer.com)
  • Under OAE3, the pCO 2 and warm and humid paleoclimate caused an increase in the total organic carbon (TOC) and the organic carbon isotope (δ 13 C org )negative deviation near the Santonian-Campanian (S-C) boundary. (kirj.ee)
  • With increasing sulfate content, the total organic carbon/total sulfur (TOC/TS) in the formation decreased, and the sulfate δ 34 S produced a negative bias. (kirj.ee)
  • When it comes to accurately measuring total organic carbon, our mission is to make your working life easier. (elementar.com)
  • Learn why total organic carbon (TOC) measurement is the safer, more reliable and environmentally friendly alternative to biological and chemical oxygen demand (BOD and COD) measurement in wastewater analysis in this white paper. (elementar.com)
  • The laboratory hosts two IRMS instruments, a Thermo Scientific Delta V Advantage and a Delta V Plus, with peripheral equipment and provides light stable isotope determinations on various sample matrices. (luomus.fi)
  • Collaborative research is prioritized, but time permitting the laboratory provides stable isotope analytical services also for non-collaborative research and non-academic customers. (luomus.fi)
  • Simulating speleothem growth in the laboratory: Determination of the stable isotope fractionation (d 13 C and d 18 O) between H 2 O, DIC and CaCO 3 . (uni-mainz.de)
  • The focus of the laboratory is on dendrochronological age determination of wood material from archaeological excavations, historical constructions, ship wrecks, art work etc. (lu.se)
  • 2004) for determination of the oxygen isotopic composition of. (fsu.edu)
  • The carbon isotopic composition of an organism mainly reflects its dietary signature (DeNiro and Epstein 1978 ), and coordinated isotopic measurements of organisms provide a unique approach to describing the dietary habits of animals, a macroscale ecological phenomenon. (springeropen.com)
  • Variations in temperature, moisture and a number of other environmental properties may be recorded as changes in ring width but also, for example, as changes in the stable carbon- and oxygen-isotope composition of wood samples. (lu.se)
  • Thus, the development of uncomplicated methods for selective determination of mercury in trace amounts in different matrices is serious [12]. (jwent.net)
  • This dataset contains carbon and nitrogen concentrations and stocks in total soil organic matter and its fractions from the Konza Prairie Irrigation Transect Experiment. (ksu.edu)
  • Although the carbon and nitrogen isotopic compositions of diverse types of organic matter were measured and discussed by the pioneers of isotope geochemistry (e.g. (springeropen.com)
  • A range of weights is available for methods including fire assay, cyanide leach, and aqua regia digestion for determination at parts-per-billion to percent concentrations. (alsglobal.com)
  • Correlation ( r = 0.77) was good between the 2 methods for all determinations. (avma.org)
  • Atomic spectroscopic methods are powerful analytical techniques for the determination of elements in a great number of samples. (jwent.net)
  • The determination of trace amounts of xylene in biological tissues and fluids has been restricted to only a limited number of analytical methods. (cdc.gov)
  • Gao YW, Bargmann GG, Brand U, Noakes DLG (2005) Stable isotopic and trace elemental compositions of otoliths and the stock structure of Pacific cod ( Gadus macrocephalus ). (springer.com)
  • Carbon and nitrogen are essential elemental constituents of organisms and form various chemical species on Earth. (springeropen.com)
  • Additionally, these partnerships generated information to assist the Mine Safety and Health Administration (MSHA) in determining that elemental carbon was the proper substitute for DPM. (cdc.gov)
  • Stable isotope labeling by amino acids in cell culture, SILAC, as a simple and accurate approach to expression proteomics. (nature.com)
  • The isotopic distributions of carbon and nitrogen in a single organism as well as in the whole biosphere are strongly regulated, so that their major components such as amino acids are coordinated appropriately rather than controlled separately. (springeropen.com)
  • Experimental determination of the proportion of a given stable carbon isotope (C12 or C13) in a sample. (usgs.gov)
  • Quantitative data on past conditions will be determined by the use of transfer functions derived from isotopic determinations of materials from analogous modern systems. (ahobproject.org)
  • Sandy sediments cover 50-60% of the continental shelves and are highly efficient bioreactors in which organic carbon is remineralized and inorganic nitrogen is reduced to N 2 . (nature.com)
  • Investigation of Approaches for the Determination of Inorganic Chloramines in Workplace Air. (cdc.gov)
  • The proposed sensor as a promising and low-cost method successfully applied for determination of RC in commercial pharmaceutical formulations such as the resorcinol cream of 2% O/W emulsion available on the market with the recovery of 98.47 ± 0.04. (biomedcentral.com)
  • 5. Wagreich, M. "OAE3" - regional Atlantic organic carbon burial during the Coniacian-Santonian. (kirj.ee)
  • Stable Isotope Lab analysis of fish samples collected at various locations throughout Washington state between 2007 and 2009. (noaa.gov)
  • For more information and instructions for samples, see stable isotope determinations . (luomus.fi)
  • Large, stable particles must be digested, saline samples lead to corrosion, and sedimentation and ash deposits cause increased and usually complicated maintenance. (elementar.com)
  • Carbon 12 comes with the same number of protons and neutrons, whereas Carbon 14 has different proton and neutron numbers. (differencebetween.net)
  • Carbon 12 is stable because it contains the same number of protons and neutrons and the Carbon 14 is unstable because there of the difference in their proton and neutron numbers. (differencebetween.net)
  • LP3 is a unique entry point and partner for both research aiming at conventional x-ray protein structure determination, as well as for enabling research using neutron scattering techniques that require deuterated bioreagents. (lu.se)
  • Wiederhold, J. G. Metal stable isotope signatures as tracers in environmental geochemistry. (nature.com)
  • As such, we provide services and make equipment available in the areas of recombinant protein production, crystallisation, biophysical characterization, and structure determination. (lu.se)
  • LP3 and PPS offer services for the entire process chain of production, purification, characterization, protein crystallisation and protein structure determination and structure refinement, or each individual step in the chain. (lu.se)
  • The advantage of the CLD is linearly calibrated, stable measured values, which greatly simplifies calibration and result evaluation. (elementar.com)
  • Conclusions and Clinical Relevance -The NICO method is a viable, noninvasive method for determination of CO in neonatal foals with normal respiratory function. (avma.org)
  • The fractions of 192Ir carried with the carbon NP retained in STOs, the For personal use only. (cdc.gov)
  • We review the biochemical and physiological bases of the use of carbon and nitrogen isotopic compositions as an approach for environmental and ecological studies. (springeropen.com)
  • An important application of the analysis of carbon and nitrogen isotopic compositions is in ecological studies. (springeropen.com)
  • However, the obtained SW voltammograms for simultaneous determination of RC and HQ exhibited a desirable peak separation of about 360 mV potential difference and a satisfactory linear response over the range of 50-700 µM and 5-350 µM with the favorable correlation coefficient of 0.991 and 0.995, respectively. (biomedcentral.com)
  • The flexible extension of measurement results (TOC, TC, TIC, NPOC, DOC) to include simultaneous TNb determination using efficient EC cell technology or a modern, integrated chemiluminescence detector (CLD) is also a requirement we frequently encounter in our discussions. (elementar.com)
  • Among the modified electrodes, carbon paste electrodes (CPEs) received extraordinary attention due to the advantages of easy preparation and renewability, generous surface chemistry, stable response, wide potential window and low ohmic resistance. (biomedcentral.com)
  • Nitrogen- trichloride was stable in a glass/polytetrafluoroethylene sample bulb for over 48 hours. (cdc.gov)
  • Moreover, the results would be compared with previous reports to confirm whether one carbon nanomaterial can really affect the behavior and fate of another in vivo and to further understand the related mechanism. (springer.com)
  • Learn about the influence combustion temperature has on TOC determination in surface and wastewater, and how you can solve these and other challenges more quickly and conveniently. (elementar.com)
  • Do you know which influence the combustion temperature has on TOC determination in environmental and wastewater? (elementar.com)
  • Gao YW (2002) Regime shift signatures from stable oxygen isotopic records of otoliths of Atlantic cod ( Gadus morhua ). (springer.com)
  • Radioisotope tracing technology can measure accurately the content of carbon nanomaterials in any tissue. (springer.com)
  • Reliable age determination of killer whales is feasible, and GLGs are accumulated annually. (bioone.org)
  • A reliable and stable ventilation system is essential to the safe operation of underground mines. (cdc.gov)
  • Thus, it is important to further investigate the biodistribution of nanomaterials post co-exposure to different structures of carbon nanomaterials. (springer.com)
  • Development of a hemi-nested RT-PCR tile adults in their definitive vertebrate during the main animal-trapping sea- method for the specific determination of hosts. (cdc.gov)
  • Krogh, T. E. A low-contamination method for hydrothermal decomposition of zircon and extraction of U and Pb for isotopic age determinations. (nature.com)
  • These data allow atomic level determination of H-PAH reactions. (europa.eu)
  • Carbon 12 has its own importance, as it is used as a standard form for measuring the atomic weight of all elements. (differencebetween.net)
  • The organic sediment within coastal wetlands is composed of carbon sequestered over the time scale of the wetland's existence. (usgs.gov)
  • This pattern cannot be linked to anthropogenic activity or to food web trophic changes, but may result from natural phenomena such as increases in productivity, carbon supply and coastal flooding driven by glacial melting and sea-level rise. (frontiersin.org)