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 carbon-13

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updated Thu. February 21, 2019

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A combination of in situ MAS-NMR spectroscopy and the use of carbon-13 isotope enriched phenol and cyclohexanol allowed the identification of the reaction pathway that is difficult to probe by other spectroscopy methods. The reaction sequence does not occur as a result of competitive adsorption but by ...
Scientists know the precise rate at which one variant of carbon found in the atmosphere, Carbon-14, decays into another variant (or isotope), Carbon-13. Thus, by determining the ratios of these types of carbon in samples taken from the Arctic, they can determine when the carbon was first drawn out of the ...

(Nanowerk News) How do small defects in the surface of solar cell material affect its ability to absorb and convert sunlight to electricity? How does the molecular structure of a porous material determine its ability to separate gases from one another? Understanding the structure and function of materials at ...
Dr Ferdia Gallagher, Cancer Research UK Clinician Scientist Fellow, Reader in Molecular Imaging, Cambridge Project/Rapid Scanner, Addenbrooke's Hospital, Hills Rd, Cambridge, research has involved the translation of hyperpolarized carbon-13 MRI into humans and this has involved creating a ...
They did this by making sugar molecules that included a rare but non-radioactive isotope of carbon, 13C. Some animals were fed fructose doped with this isotope. Others were fed glucose doped with it. By looking at where the 13C went in each case the researchers could follow the fates of the two sorts of ...
Woody plants like trees and shrubs obtain carbon differently from grasses, so their plant waxes end up with different ratios of the stable isotope carbon-13. Prior to 2,600 years ago, the plant waxes in Lake Barombi seemed to be from mostly trees and shrubs, exactly what you'd expect in a thriving rainforest.

The carbon-13 profile of shale gas overlaps with that of agriculture. Therefore, the increase in methane emissions from cows may have in fact been from shale gas. There has been a substantial increase in shale-gas development over the past decade. The controversial practice of hydraulic fracturing or ...
Scientists know the precise rate at which one variant of carbon found in the atmosphere, Carbon-14, decays into another variant (or isotope), Carbon-13. Thus, by determining the ratios of these types of carbon in samples taken from the Arctic, they can determine when the carbon was first drawn out of the ...
A scientist from the US has put forward a new approach to encode a molecule with 13C. He says the technique can mirror the complexity of Rivest-Shamir-Adelman (RSA) encryption – an algorithm that encrypts credit card details during online transactions. Encoding matter with regiospecific 12C/13C ...
Once the technique is proven, many other air components, such as oxygen-18, nitrogen-15 and carbon-13, could be distilled by applying the same process. These elements have important applications in many fields of research and technology, including diagnostic techniques for the detection of cancer.
Rare particles like carbon-13 and 14 are often used for radiometric dating. It's a simple process that measures different levels of isotopes (atoms of the same type that have different numbers of neutrons in their core). Since we know, precisely, just how long it takes for these particles to degrade, we can use ...
On the basis of type, the stable isotope-labeled compounds market is segmented into Carbon-13, Deuterium(H-2), Oxygen-18, Nitrogen-15, and others (noble gases and metals). In 2017, the H-2 segment is expected to account for the largest share of the market and is projected to grow at the highest CAGR ...
Rare forms of atoms, like carbon-13, carbon-14, and nitrogen-15, have long been used to figure out the ages of ancient artifacts and probe the nuances of prehistoric food chains. The source of these rare isotopes? Complicated cascades of subatomic reactions in the atmosphere triggered by high-energy ...
These include carbon-13, carbon-14 and nitrogen-15 but future studies may also reveal others, such as isotopes of hydrogen, helium and beryllium. The findings also have implications for astronomers and planetary scientists.Other planets within our solar system have thunderstorms in their atmospheres ...
The unstable nuclei then gradually decay into stable carbon-13 or nitrogen-15 while emitting positrons. But these reactions had never been observed taking place during thunderstorms, as the distances involved made measuring the radiation a challenge. Now, researchers in Japan have used readings ...
For each event, including the five mass extinctions, Rothman noted the change in carbon, expressed in the geochemical record as a change in the relative abundance of two isotopes, carbon-12 and carbon-13. He also noted the duration of time over which the changes occurred. He then devised a ...
The earliest was the bile acid breath test, using bile acids radiolabeled with carbon-13 or carbon-14. While not very sensitive (30-60%) it was ...

Usually graphite of biogenic origin give two things – a low proportion of “heavy” carbon-13 and the special structure of its grains, which includes ...
On the basis of type, the stable-isotope-labelling market is broadly segmented into Carbon-13, Deuterium (H-2), Oxygen-18, Nitrogen-15, and ...
It is the ratio of heavy carbon (Carbon 13) to light carbon (Carbon 12) in a pure carbon substance called graphite, compared to that same ratio ...
On the basis of type, the stable-isotope-labelling market is broadly segmented into Carbon-13, Deuterium (H-2), Oxygen-18, Nitrogen-15, and ...
It is the ratio of heavy carbon (Carbon 13) to light carbon (Carbon 12) in a pure carbon substance called graphite, compared to that same ratio ...
To perform their experiments, first, they had to track the carbon fixation through carbon 13 isotopes and a complementary carbon imaging tool ...
Nitrogen-15 and carbon-13 are stable isotopes, and scientists are able to track these isotopes to measure, for example, how efficiently crops ...
The researchers used data regarding concentrations of carbon 12 and carbon 13 isotopes derived from sediment samples found in terrestrial ...
The ratio of carbon-12 to carbon-13 isotopes in those samples helped the team determine that the most likely source of the carbon came from ...
The ratio of carbon-12 to carbon-13 isotopes in those samples helped the team determine that the most likely source of the carbon came from ...
Carbon-13, a non radioactive isotope of carbon, is used because the most commonly occurring isotope – carbon-12 – does not give off a MRI ...
Dig It is KTW's regularly published column on the history beneath our feet in the Kamloops region. A group of nine professional archeologists ...
... change in carbon, expressed in the geochemical record as a change in the relative abundance of two isotopes, carbon-12 and carbon-13.
The idea behind that date is relatively straightforward: biology has a chemical preference for carbon-12 over carbon-13, so biological carbon ...
It contains two forms of carbon: carbon-12 and carbon-13. The samples Komiya looked at had relatively little carbon-13 (Nature, doi.org/cdqn).
The idea behind that date is relatively straightforward: biology has a chemical preference for carbon-12 over carbon-13, so biological carbon ...
The paper's authors inspected the amount of carbon-12 and carbon-13 in the graphite sample to work out whether or not there were any ...
Life favours the lighter version of carbon, called carbon-12, over the heavier version, carbon-13, and when it dies, becomes sludge, and ...
... Rothman identified the ebb and flow of carbon–12 and carbon–13 – two isotopes of carbon whose abundance has varied considerably in ...
... change in carbon, expressed in the geochemical record as a change in the relative abundance of two isotopes, carbon-12 and carbon-13.
The project is studying the effect of EED on child growth and health in specific populations, using a stable isotope technique — the carbon-13 ...
Methane from oil and gas production contains a relatively high amount of carbon-13, a rare isotope of carbon. Overall, carbon-13 makes up ...
We observed metabolic differences between the aggressive prostate cancer cell line PC3 and the even more aggressive, metastatic subline PC3M assessed by hyperpolarized in vivo pyruvate studies, nuclear magnetic resonance spectroscopy, and carbon-13 feeding studies. On further examination of the differences ...
Atmospheric carbon has two different forms, or isotopes, carbon-12 and carbon-13. Carbon-13 is less common, yet the researchers found that it ...
It contains two forms of carbon: carbon-12 and carbon-13. The samples Komiya looked at had relatively little carbon-13 (Nature, doi.org/cdqn).
Carbon 12, which has six protons and six neutrons in its nucleus, is lighter than carbon 13, which carries an extra neutron. Though both forms ...
The paper's authors inspected the amount of carbon-12 and carbon-13 in the graphite sample to work out whether or not there were any ...
The idea behind that date is relatively straightforward: biology has a chemical preference for carbon-12 over carbon-13, so biological carbon ...
They then separated those moments in which the extinction coincided with sharp fluctuations in the ratio of carbon isotopes 12 to carbon 13 in ...
... Rothman identified the ebb and flow of carbon–12 and carbon–13 – two isotopes of carbon whose abundance has varied considerably in ...
He identified these by measuring changes in the relative abundance of two isotopes, carbon-12 and carbon-13. For each of these ratio ...
The two main isotopes, or atomic forms, of carbon are carbon-12 (12C) and carbon-13 (13C). As CO2 has risen since the late 19th century, the ...
The project is studying the effect of EED on child growth and health in specific populations, using a stable isotope technique — the carbon-13 ...


 

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carbon isotopes:
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       14