Ulrike Manz

Learn More
Following chronic retinol (vitamin A) deprivation leading to exhaustion of liver vitamin A reserves below 50 I.U. per liver hamsters were fed diets either deficient in ("Rd":250 I.U.A./kg in experiment I, 1000 I.U.A/kg in experiment II) or enriched with retinol ("Rw":10000 I.U.A/kg in experiment I and II). After 4 weeks some of the animals (36 in experiment(More)
  • U Manz, R Maurer
  • International journal for vitamin and nutrition…
  • 1982
A method for the chemical determination of vitamin K3 in vitamin premixes and feedstuffs is described. The extraction of the active compound and its conversion into menadione is carried out in the same flask. The extract can be used directly for the HPLC determination with UV detection. In the case of low vitamin K3 levels (less than 2 ppm menadione) the(More)
A method for the quantitative determination of the main carotenoids, such as lutein, zeaxanthin, apocarotenoic acid ethyl ester, bixin, canthaxanthin, citranaxanthin and paprika pigments in feeds and premixes for laying hens and broilers is described. The method has, compared to the known analytical procedures, several advantages: 1. Differentiation between(More)
OBJECTIVE The objective of this study is to explore the discriminatory impacts of genetic diagnosis for people living with the chronic illness of hereditary haemochromatosis in Germany. METHODS Semi-structured interviews with 15 patients; all had tested positive for a genetic mutation associated with haemochromatosis and already displayed symptoms of the(More)
  • 1