نتایج جستجو برای: isotope ratio

تعداد نتایج: 530028  

Journal: :European review for medical and pharmacological sciences 2013
M Pizzoferrato F Del Zompo F Mangiola L R Lopetuso V Petito G Cammarota A Gasbarrini F Scaldaferri

Breath tests are non-invasive, non-radioactive, safe, simple and effective tests able to determine significant metabolic alterations due to specific diseases or lack of specific enzymes. Carbon isotope (13)C, the stable-non radioactive isotope of carbon, is the most used substrate in breath testing, in which (13)C/(12)C ratio is measured and expressed as a delta value, a differences between rea...

Journal: :Journal of the Mass Spectrometry Society of Japan 1962

2012
Yasmeen Ahmad Francois-Michel Boisvert Emma Lundberg Mathias Uhlen Angus I. Lamond

In higher eukaryotes many genes encode protein isoforms whose properties and biological roles are often poorly characterized. Here we describe systematic approaches for detection of either distinct isoforms, or separate pools of the same isoform, with differential biological properties. Using information from ion intensities we have estimated protein abundance levels and using rates of change i...

2012
Yasmeen Ahmad Emma Lundberg Mathias Uhlen Angus I. Lamond

In higher eukaryotes many genes encode protein isoforms whose properties and biological roles are often poorly characterized. Here we describe systematic approaches for detection of either distinct isoforms, or separate pools of the same isoform, with differential biological properties. Using information from ion intensities we have estimated protein abundance levels and using rates of change i...

Journal: :Journal of the Mass Spectrometry Society of Japan 2011

Journal: :Symposium - International Astronomical Union 2000

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