Spin-spin coupling is observed in NMR of hydrogen-1 ( NMR ), since its natural abundance is nearly 100 %; isotope enrichment is required for most other elements.
32.
The natural abundance of the higher isotopes is low for frequently encountered elements such as hydrogen, carbon and nitrogen and the intensity of isotope peaks subsequently low.
33.
The natural abundance of deuterium seems to be a very similar fraction of hydrogen, wherever hydrogen is found, unless there are obvious processes at work that concentrate it.
34.
The natural abundance of 13 C in the brain is only about 1 %; therefore, 13 C fMRS studies usually involve the isotope enrichment via infusion or ingestion.
35.
Hence deviations from natural abundance on earth are often measured in parts per thousand ( per mille or ? ) because they are less than one percent ( % ).
36.
This was due to the natural abundance of meat, fish, and pure water; the good food conservation conditions during the winter; and an adequate wheat supply in most years ."
37.
Despite this, the natural abundance of California, and the environmental management techniques developed by California tribes over millennia, allowed for the highest population density in the Americas north of Mexico.
38.
Because of its low cost, non-toxicity, the natural abundance of iron, its excellent thermal stability, safety characteristics, electrochemical performance, and specific capacity ( 170 g ) it gained some market acceptance.
39.
Naqvi and colleagues also generated the first comprehensive data set on natural abundance of isotopes in various dissolved nitrogen species from any oceanic area that provided new insights into marine nitrogen cycling.
40.
Purified argon and nitrogen gases are most commonly used as inert gases due to their high natural abundance ( 78 % N 2, 1 % Ar in air ) and low relative cost.
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