No abstract

The effect of 100 ppm of Fe in milk replacer on some hematological and tissue Fe variables was studied during the first 7 wk of the fattening period in two groups of eight calves with low or high initial blood hemoglobin concentrations. Hemoglobin concentration in calves with initially low hemoglobin increased. It decreased in those with initially high hemoglobin, but the difference remained over the experimental period. Higher mean liver Fe concentration, in some cases extremely high, and lower mean total Fe-binding capacity were found throughout the experiment in the group with the initial high hemoglobin. Of all variables, only low muscle Fe concentrations were correlated linearly with plasma Fe. In another experiment, the relationship of some hematological and tissue Fe variables during late gestation (about 10 d prepartum), at calving in dams, and at delivery in calves was investigated. The calves showed markedly higher liver Fe concentrations at delivery than their dams just before delivery, but these liver Fe concentrations were not correlated between dam and calf. The hematological and tissue Fe variables showed a weak correlation between dams and calves during late gestation or at delivery. However, dams as well as calves were Fe-sufficient.

energetically favored conformation of all the ethyl conformers observed in the crystals.Another important result of the Raman investigation is that it-ir aggregation in the triclinic B crystals of both Cuand NiOEP results in structural changes similar to those occurring upon aggregation in solution. This similarity is observed in spite of probable differences in substituent orientations in the solution and crystal cases. This result indicates that it is the ir-it interactions that are important in determining the monomer-aggregate structural differences, not the substituent orientations.

No abstract

The mochanisrn of concentration qucnching of the Gd3+ emission in (La, Gd)AIO, and the Eu3+ emission in (Eu, Gd)AI03 is reported and discussed. Nearest and next-nearest noighbors are involved in the concentration quenching process. Nearest neighbor transfer occuw by exchange interaction. Even for next-nearest neighbors this type of interaction seems to dominate. In GdAIO, energy migration via the 6 1 level is reported. After excitation of the 6I levcl, tho excitation energy migrates a t 300 K about 1350 steps over the O I level before nonradiative decay to the aP level occurs. The oncrgy migration i n NuAIO, at low temperaturea can be doscribed with a phonon-assisted process.Der Mechanismus der Konzentrationstilgung dcr Gd*+-Emission in (La, Gd)AIO, und dcr Eu3+-Emission in (Eu, Gd)AIO, wird mitgcteilt und diskutiert. Niichste und fiberniichste Nachbarn werden in den Konzentrationstilgungseffekt oinbezogen. Transfer niichster Nachbarn tritt durch Austauschwechsolwirkung auf. Sogar f~r ubernachste Nachbarn scheint diese Wechselwirkung zu dominicrcn. In GdAIO, wird Encrgiewanderung iiber das 61-Nivcau gefunden. Nach Anregung des 'I-Niveaus wandert die Anregungsencrgic bei 300 K ctwa 1350 Schritte iiber das 61-h'iveau, bevor nichtstrnhlendes Abklingen auf das 6P-Nivcau auftritt. Die Energiewanderung in EuAlO, bei tiefen Temperaturen lHDt sich mit einem phononenuntcrstiitzten ProzoB beschrciben.