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Topic: Carbon-13

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Radiocarbon dating Carbon dioxide also permeates the oceans, dissolving in the water. Since it is assumed that the cosmic ray flux is constant over long periods of time, carbon-14 is assumed to be continuously produced at a constant rate and therefore that the proportion of radioactive to non-radioactive carbon throughout the Earth's atmosphere and oceans is constant. The highest rate of carbon-14 production takes place at altitudes of 30,000-50,000 feet, and at higher geomagnetic lattitudes, but the carbon-14 spreads evenly throughout the atmosphere and reacts with oxygen to form carbon dioxide. www.sciencedaily.com /encyclopedia/radiocarbon_dating

Carbon 13 Records Carbon 13 believe that there are far too many "studio bands" that have never even been in the same room as one another, let alone go out playing. Welcome to the home of Carbon 13, the newest and most exciting record label dedicated to ROCK music. Here's the good news, Carbon 13 is currently looking for artists with credibility in the ROCK genre. www.carbon13.co.uk

Properties of Carbon Carbon occurs in nature as the sixth most abundant element in the universe and the 19th element in order of mass in the Earth's crust. Coal, for example, is heated to give coke; natural gas or petroleum to give carbon black (also called lampblack and channel black); wood to give charcoal; bone to give bone char; petroleum coke or coal to give baked carbon, carbon arcs, or carbon electrodes. In 1785 it was discovered that activated carbon from the carbonization of wood and charcoal removes color from solutions--for example, the brown color from raw sugar solutions. www.dendritics.com /scales/el-carbon.asp

Carbon star list Carbon stars are evolved cooling giants (and some dwarfs) with outer shells or clouds of carbon dust. Our list is adapted from Stephenson's 1989 catalogue of Cool Galactic Carbon Stars (2nd edition) and contains carbon stars at or brighter than magnitude 8.5, (Epoch= J2000). Carbon stars appear relatively dim in the eyepiece. www.belmontnc.4dw.net /carbonstar.htm

Carbon Carbon dioxide and several carbonates are used in fundamental chemistry as are carbon containing alcohols and oils. More compounds known to us contain carbon than all the other elements combined, so naturally carbon compounds abound in our laboratory. Although the name carbon comes from Roman times, the non-metallic element has been known, as charcoal, coal, diamonds and soot, since the dawn of mankind. chemlab.pc.maricopa.edu /periodic/C.html

Carbon 13 magnetic resonance studies of DL-2-(alpha-hydroxyethyl) thiamin and related compounds. Relation of kinetic acidity to electronic factors in thiamin catalysis -- Gallo and Sable 251 (9): 2564 -- Journal of Biological Chemistry Carbon 13 magnetic resonance studies of DL-2-(alpha-hydroxyethyl) thiamin and related compounds. Carbon 13 NMR spectra have been obtained for aqueous solutions of formation at the alpha carbon both enzymatically and in model systems. www.jbc.org /cgi/content/abstract/251/9/2564

Carbon monoxide (EHC 13, 1979) Carbon monoxide can be produced endogenously from the catabolism of pyrrole rings, originating from haemoglobin, myoglobin, cytochromes, and other haem-containing pigments. Carbon monoxide absorbs electromagnetic radiation in the infrared region with the main absorption band centred at 4.67 µm; this property is used for the measurement of carbon monoxide concentrations in air. Another natural source of carbon monoxide is rainwater, where production of carbon monoxide in the clouds is tentatively attributed to the photochemical oxidation of organic matter or the slight dissociation of carbon dioxide induced by electrical discharges or both (Swinnerton et al., 1971). www.inchem.org /documents/ehc/ehc/ehc013.htm

Carbon-13 Nuclear Magnetic Resonance Study of Metabolism of Propionate by Escherichia coli -- London et al. 181 (11): 3562 -- The Journal of Bacteriology Carbons 1/6, 2/5, and 3/4 will have multiplet structure similar -ketobutyrate from propionyl coenzyme-A and carbon dioxide by enzymes from photosynthetic and non-photosynthetic bacteria. The carbon skeleton of putrescine is derived via formation of jb.asm.org /cgi/content/full/181/11/3562

Soil sample carbon-13 Isotope-ratio analysis for carbon-13 in solid-phase samples such as soil starts with transformation to gas phase by extremely rapid and complete flash combustion of the sample material. Ionized combustion product (carbon dioxide) is mass-analyzed by means of differing mass/charge ratios among the various isotopic species of CO2. www.uga.edu /~sisbl/soil13c.html

Stable Isotope Analysis If you operate an isotope ratio mass spectrometer for hydrogen, carbon, nitrogen, oxygen or sulfur analysis, you may be interested in our IRMS services. To obtain a price for isotopic analysis of your samples, use our on-line quote and we will get back to you with an all inclusive price. We offer a range of laboratory standards and training courses. www.iso-analytical.com

CHAPTER-9 Carbon-13 nuclei make up approximately one percent of the carbon nuclei on earth. Unfortunately, the carbon-12 nucleus does not have a nuclear spin, but the carbon-13 (C-13) nucleus does due to the presence of an unpaired neutron. Therefore, carbon-13 NMR spectroscopy will be less sensitive (have a poorer SNR) than hydrogen NMR spectroscopy. www.cis.rit.edu /htbooks/nmr/chap-9/chap-9.htm

Point Carbon Carbon value continues to drift down, fuel prices steady Carbon prices soften for the sixth day in a row Disclaimer: The information contained in Point Carbon's analyses, newsletters and on its website has been obtained from sources believed to be reliable. www.pointcarbon.com

VE G.J. Martin, M.L. Martin, and S. Odiot, "Theoretical and Empirical Calculations of the Carbon Chemical Shift in Terms of the Electronic Distribution in Molecules," Org. B.E. Mann, "Carbon," in "Multinuclear NMR," J. Mason, Ed., Plenum Press, NY, 1987, Ch. wulfenite.fandm.edu /NMRspectroscopy/ve.htm

About Carbon 13 That was the beginning of carbon 13 "… And so the Carbons continued to rock, on the London circuit, in Liverpool (favourites at The Cavern Club) and Manchester. In October 2002 The Carbons made it onto the regular play list (through popular demand) of an indie/rock US cyber radio station with three million listeners. www.wivenhoe.gov.uk /Music/carbon_13.htm

Icon Isotopes : Carbon-13 Compounds Carbon monoxide is usually the choice when isolating Carbon-13. Compounds are synthesized from 99atom% minimum material, however, slight dilution of enrichment may occur in multi-step synthesis and in compounds labeled in two positions when statistically each will contain 98% carbon-13. Carbon-13 is normally produced by separation of the naturally occuring element. www.iconisotopes.com /code/Carbon13.asp

WQ-13 Figure 1 shows how contaminants adsorb onto an activated carbon filter. Carbon is not necessarily the same as AC. Tests show under-the-sink models generally have more carbon and provide superior performance and greater convenience than faucet or countertop models. www.agcom.purdue.edu /AgCom/Pubs/WQ/WQ-13.html

Carbon Isotope Analysis O of carbonate - 3 days x 5 reps. O of carbonate by acid digestion - duplicate C of carbon dioxide in breath - per tube www.iso-analytical.com /page36.html

BioCarbon - 13 ® All of the material created by BioCarbon-13 is copy protected, registered through BMI, and as such subjected to applicable copy write regulations. BioCarbon 13 hopes that you will enjoy this music and this site. Please don't hesitate to share with us your thoughts and ideas. www.biocarbon13.com

Spectroscopic studies of carbon-13 synthetic diamond As expected, vibrational frequencies involving only the motion of carbon atoms are changed in the approximate ratio (12/13) 2/, whereas those involving carbon and nitrogen are changed according to the square root of the ratio of the reduced masses. Furthermore the measurements have allowed the authors unambiguously to identify the 237 meV localised mode in the 5RL band (zero-phonon line at 4.582 eV) of electron-irradiated diamond with the vibration of a carbon atom. stacks.iop.org /0022-3719/21/1363

Search Results for carbon-13 - Encyclopćdia Britannica The abundance of carbon-13 in sedimentary organic materials and in carbonates from 900,000,000 to 600,000,000 years ago indicates that unusually large quantities of organic carbon were buried without... Brief information on the crystalline structure of carbon dioxide and its usage in the study of causes for the greenhouse effect. The development of a biologically mediated carbon cycle prior to 3,500,000,000 years ago virtually requires that some form of photosynthesis had arisen by that time, but the possibility remains that... www.britannica.com /search?query=carbon-13

Learning Carbon: Chapter 13: Desktop Icons To find out more, see the Icon Services and Utilities documentation in Carbon Help (available in the Project Builder Help menu). Now that you've gotten an overview of how application and document icons are added to an application, you can get some practice by adding icons to the Moon Travel Planner application. By using the Icon Services programming interface, you can change the appearance of your application's icons to reflect changes in a file's condition or the progress of a process. www.oreilly.com /catalog/learncarbon/apple/ch13.html

Merriam-Webster Online : an isotope of carbon of mass number 13 that constitutes about 1/70 of natural carbon and is used as a tracer especially in spectroscopy utilizing nuclear magnetic resonance For More Information on "carbon+13" go to Britannica.com Now you can take the Eleventh Edition with you anywhere as Franklin's new Speaking Electronic Handheld! www.m-w.com /cgi-bin/dictionary?va=13

Origin of the Cytoplasmic pH Changes during Anaerobic Stress in Higher Plant Cells. Carbon-13 and Phosphorous-31 Nuclear Magnetic Resonance Studies -- Gout et al. 125 (2): 912 -- PLANT PHYSIOLOGY C-enriched carbon of pyruvate, Gaba, lactate, ethanol, and Ala was assessed by incubating cells on glycerol as a unique carbon of lactate and ethanol as long as Glc was the carbon substrate www.plantphysiol.org /cgi/content/full/125/2/912

Bio Carbon 13 - index page - Free MP3 downloads, CDs, Bio Info, Tour Dates, Lyrics and More!" Bio Carbon 13 - index page - Free MP3 downloads, CDs, Bio Info, Tour Dates, Lyrics and More!" BioCarbon-13 was born out of the idea to combine the best of the contemporary EBM and other electronic beats with rock riffs and melodies. Would my bio make you like my music or me? I don’t think so… artists.iuma.com /IUMA/Bands/Bio_Carbon_13

Essential Oils: Analysis by Capillary Gas Chromatography and Carbon 13-NMR Spectroscopy 2nd edition Oilganic Essential Oil Books Shelf Reviews: Essential Oil Analysis Essential Oils: Analysis by Capillary Gas Chromatography and Carbon 13-NMR Spectroscopy 2nd edition Essential Oils: Analysis by Capillary Gas Chromatography and Carbon 13-NMR Spectroscopy 2nd edition Chemists working with perfumes and flavors would find this a valuable additional to their book shelf. www.oilganic.com /books/Analysis-Gas-Carbon-Spectroscopy.htm

Carbon-13 Heteronuclear Coupled Spectra Page Carbon-13 spectrum for 2,2,2-trifluoroethanol (CF Heteronuclear Coupling of Carbon to Phosphorus-31 P coupling will be observed for all organic compounds containing C-P bonds. www.chemistry.ccsu.edu /glagovich/teaching/472/nmr/13cheterocoupled.html

1). Quantify the compounds that have the highest D values. Typically done by stable isotope dilution analysis. Synthesize labelled compounds (deuterium or carbon 13) of interest, add to original food, isolate aroma again, use selected ion mass spectrom Synthesize labelled compounds (deuterium or carbon 13) of interest, add to original food, isolate aroma again, use selected ion mass spectrometry to selectively determine the ratio of labelled to unlabelled compounds present. Synthesize labelled compounds (deuterium or carbon 13) of interest, add to original food, isolate aroma again, use selected ion mass spectrom Stable isotope approach is very tedious (expensive!) to do but need accurate quantitative data. courses.che.umn.edu /02fscn4345-1f/Sensory-Instrumental-Part%202.htm

Publications from '86 to present Gary E. Maciel and Ronald V. James, "Solvent Effects on the C-13 Chemical Shift of the Substituted Carbon Atom of Phenol," J. Gary E. Maciel, "Carbon-13 Chemical Shifts of Vinyl Carbons," J. Paul D. Ellis and Gary E. Maciel, "Fermi Contact Contributions to Spin-Spin Coupling between Directly Bonded Carbons and Hydrogens in Small-Ring Compounds," J. lamar.colostate.edu /~macielab/publications.html

The Use of Carbon-13 Nuclear Magnetic Resonance Spectra in the Identification and Authentication of Monomethoxyamphetamines and Dimethoxyamphetamines. Bailey K, Legault D . 1981;26(1): 27-34. The ring substituents affect the resonances of the ring carbons in a consistent manner. The data should be valuable in the forensic science identification and structural authentication of these and related substances and further confirm the power of www.astm.org /jforensicsci/PAGES/2.htm

Wiley::Carbon 13 NMR Spectroscopy Wiley > Chemistry > Spectroscopy > NMR Spectroscopy > Carbon 13 NMR Spectroscopy www.wiley.com /remtitle.cgi?isbn=0471913065

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