TY - JOUR A1 - Gloede, J. A1 - Ozegowski, S. A1 - Keitel, I. A1 - Buttge, K. A1 - Gruner, M. A1 - Costisella, B. A1 - Pritzkow, Wolfgang A1 - Stephan, H. A1 - Bartoschek, M. T1 - Zweifach und dreifach intramolekular verbrückte p-tert-Butylcalix[8]aren-triphosphate - Synthese, Struktur und Stereochemie [1] JF - Zeitschrift für anorganische und allgemeine Chemie = Journal of inorganic and general chemistry N2 - The phosphorylation of p-tert-butylcalix[8]arene (1) with phosphorus pentachloride and hydrolysis gives intramolecular bridging tert-butylcalix[8]arene triphosphates. The reactivity (esterification, dehydratisation, complexation), the structure (nmr and x-ray), and the stereochemical behaviour of the phosphates will be discussed. KW - Calix[8]arenes KW - Phosphates KW - Heterocycles KW - Stereochemistry PY - 2006 DO - https://doi.org/10.1002/zaac.200500203 SN - 0044-2313 SN - 1521-3749 SN - 0372-7874 SN - 0863-1786 SN - 0863-1778 VL - 632 IS - 1 SP - 123 EP - 132 PB - Wiley-VCH CY - Weinheim AN - OPUS4-13201 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Knobbe, N. A1 - Vogl, Jochen A1 - Pritzkow, Wolfgang A1 - Panne, Ulrich A1 - Fry, H. A1 - Lochotzke, H.M. A1 - Preiss-Weigert, A. T1 - C and N stable isotope variation in urine and milk of cattle depending on the diet JF - Analytical and bioanalytical chemistry N2 - The stable carbon and nitrogen isotopic composition of urine and milk samples from cattle under different feeding regimes were analysed over a period of six months. The isotope ratios were measured with isotope ratio mass spectrometry (IRMS). The δ13C values of milk and urine were dependent on different feeding regimes based on C3 or C4 plants. The δ13C values are more negative under grass feeding than under maize feeding. The δ13C values of milk are more negative compared to urine and independent of the feeding regime. Under grass feeding the analysed milk and urine samples are enriched in 13C relative to the feed, whereas under maize feeding the 13C/12C ratio of urine is in the same range and milk is depleted in 13C relative to the diet. The difference between the 15N/14N ratios for the two feeding regimes is less pronounced than the 13C/12C ratios. The δ15N values in urine require more time to reach the new equilibrium, whereas the milk samples show no significant differences between the two feeding regimes. KW - Cattle KW - Urine KW - Milk KW - Feeding regime KW - Stable isotope PY - 2006 DO - https://doi.org/10.1007/s00216-006-0644-6 SN - 1618-2642 SN - 1618-2650 VL - 386 IS - 1 SP - 104 EP - 108 PB - Springer CY - Berlin AN - OPUS4-12746 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -