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A tracer investigation of obligatory oxidative amino acid losses in healthy, young adults
cyst(e)ine leucine humans
2016/6/1
Estimation of the minimum requirement for indispensable
amino acids (IAAs) has been attempted by assuming
that obligatory oxidative losses (OOLs) of IAAs can be approximated
from nitrogen losses an...
Determination of the Absorption of Zn by Preterm Infants, Using 70Zn Enriched Tracer
Stable Isotope Zinc Absorption Premature Infants
2009/6/29
Absorption of zinc by preterm infants from a synthetic milk labelled extrinsically with 70Zn tracer was determined by faecal monitoring. Six male preterm babies with a mean gestational age of 31±2.9 ...
Food web responses to low-level nutrient and 15N-tracer additions in the littoral zone of an oligotrophic dune lake
Food web responses low-level nutrient 15N-tracer additions littoral zone oligotrophic dune lake
2014/5/9
We used natural abundance stable isotopes to establish the structure of the littoral zone food web of an oligotrophic, perched dune lake on Fraser Island, Australia. Mixing model analyses incorporatin...
Comparison of stable-isotope-tracer methods for the determination of magnesium absorption in humans
double-labeling methods dysprosium Magnesium absorption
2016/12/30
The double-labeling (DL) method for determining magnesium absorption is less cumbersome than is the fecal monitoring method, which has been used most often, but it has not been validated.
Urea-nitrogen production and salvage are modulated by protein intake in fed humans: results of an oral stable-isotope-tracer protocol and compartmental modeling
stable-isotope-tracer protocol compartmental modeling
2016/12/30
The influence of protein source on postprandial urea kinetics is poorly understood, despite its nutritional significance with respect to nitrogen homeostasis. Furthermore, traditional tracer infusion ...
Isotopic tracer techniques for studying the bioavailability and bioefficacy of dietary carotenoids, particularly β-carotene, in humans: a review
Stable isotopes carbon isotopes radioisotopes
2016/12/27
Vitamin A deficiency is a serious health problem in many developing countries. Provitamin A carotenoids in fruit and vegetables are the major source of vitamin A for a large proportion of the world’s ...
Age and copper intake do not affect copper absorption,measured with the use of 65Cu as a tracer,in young infants
Copper absorption human milk infants copper supplementation 65Cu
2016/12/19
Background: Copper homeostasis involves a high degree of regulation in which changes in absorption and biliary excretion are the main mechanisms. Whether neonates and small infants can make these...
Variability in conversion of β-carotene to vitamin A in men as measured by using a double-tracer study design
Carotene vitamin A activity β-carotene retinol stable isotope tracer men
2016/12/17
Background: The vitamin A activity of β-carotene is variable and surprisingly low in women. The reasons for this are not well understood. The vitamin A activity of β-carotene in men is still unce...
Twenty-four–hour oral tracer studies with L-[1-13C]lysine at a low (15 mg·kg21 ·d21) and intermediate (29 mg·kg21 ·d21) lysine intake in healthy adults
Lysine oral tracer studies amino acids oxidation, healthy adults
2016/6/7
Background: We proposed previously that the mean lysine
requirement value is <30 mg·kg21·d21 rather than the proposed
1985 FAO/WHO/UNU estimate of the upper range of the requirement,
which is 12 mg...
Variability of the conversion of b-carotene to vitamin A in women measured by using a double-tracer study design
Carotene vitamin A b-carotene absorption, metabolism stable isotope tracer women
2016/6/7
Background: Blood b-carotene and vitamin A responses to oral
b-carotene are variable in humans. Some individuals are characterized
as responders and others as low- or nonresponders. A better
unders...
Comparison of estimates of zinc absorption in humans by using 4 stable isotopic tracer methods and compartmental analysis
Zinc stable isotopes zinc absorption, compartmental modeling stable isotopic tracer methods mass balance fecal monitoring deconvolution analysis
2016/6/3
Background: Adjustment of gastrointestinal absorption is the
primary means of maintaining zinc homeostasis; however, a precise,
accurate method for measuring zinc absorption in humans
has not been ...