Nitrogen Transformations and NO 3 - Removal at a Soil-Stream Interface: A Stable Isotope Approach

2002 ◽  
Vol 12 (4) ◽  
pp. 1027 ◽  
Author(s):  
Nathaniel E. Ostrom ◽  
Lars O. Hedin ◽  
Joseph C. von Fischer ◽  
G. Philip Robertson
Keyword(s):  
Stable Isotope ◽  
Nitrogen Transformations ◽  
Stream Interface

NITROGEN TRANSFORMATIONS AND NO3−REMOVAL AT A SOIL–STREAM INTERFACE: A STABLE ISOTOPE APPROACH

2002 ◽  
Vol 12 (4) ◽  
pp. 1027-1043 ◽  
Author(s):  
Nathaniel E. Ostrom ◽  
Lars O. Hedin ◽  
Joseph C. von Fischer ◽  
G. Philip Robertson
Keyword(s):  
Stable Isotope ◽  
Nitrogen Transformations ◽  
Stream Interface

Vitamin A Value of Plant Food Provitamin A - Evaluated by the Stable Isotope Technologies

2014 ◽  
Vol 84 (Supplement 1) ◽  
pp. 25-29 ◽  
Author(s):  
Guangwen Tang
Keyword(s):  
Stable Isotope ◽  
Vitamin A ◽  
Provitamin A ◽  
Animal Origin ◽  
Plant Food ◽  
Plant Foods ◽  
A Value ◽  
Provitamin A Carotenoids ◽  
Β Carotene

Humans need vitamin A and obtain essential vitamin A by conversion of plant foods rich in provitamin A and/or absorption of preformed vitamin A from foods of animal origin. The determination of the vitamin A value of plant foods rich in provitamin A is important but has challenges. The aim of this paper is to review the progress over last 80 years following the discovery on the conversion of β-carotene to vitamin A and the various techniques including stable isotope technologies that have been developed to determine vitamin A values of plant provitamin A (mainly β-carotene). These include applications from using radioactive β-carotene and vitamin A, depletion-repletion with vitamin A and β-carotene, and measuring postprandial chylomicron fractions after feeding a β-carotene rich diet, to using stable isotopes as tracers to follow the absorption and conversion of plant food provitamin A carotenoids (mainly β-carotene) in humans. These approaches have greatly promoted our understanding of the absorption and conversion of β-carotene to vitamin A. Stable isotope labeled plant foods are useful for determining the overall bioavailability of provitamin A carotenoids from specific foods. Locally obtained plant foods can provide vitamin A and prevent deficiency of vitamin A, a remaining worldwide concern.

Stable isotope metabolic labeling of a mouse model reveals synaptic biomarkers for anxiety disorders

2009 ◽  
Vol 42 (05) ◽  
Author(s):  
MD Filiou ◽  
YY Zhang ◽  
B Bisle ◽  
E Frank ◽  
MS Kessler ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Mouse Model ◽  
Anxiety Disorders ◽  
Metabolic Labeling
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