Potenzial des IR Micro‐Imaging zur In‐situ‐Untersuchung chemischer Reaktionen in nanoporösen Katalysatoren

The in‐situ study of chemical reactions is an intensively studied research topic. A suitable method for this investigation is the IR micro‐imaging technique, which allows to record space‐ and time‐resolved IR spectra. The preparation of a suitable model system with a 3D pore system for the in‐situ recording of concentration profiles using IR micro‐imaging is described, enabling the space‐ and time‐resolved monitoring of catalytic reactions in nanoporous catalysts for the first time. The model system consists of a nanoporous glass monolith with gas‐tight sealed outer surface, therefore, enabling the recording of concentration profiles of cyclohexane and cyclohexane‐benzene mixtures as a function of time.     

Effect of dietary oils, cholesterol and antioxidant vitamin supplementation on liver microsomal fluidity and xenobiotic-metabolizing enzymes in rats

This study was undertaken to compare the effects of four oils: corn (C), olive (O), hazelnut (H) or fish (F), and the intake of two supplements: cholesterol, 1% (Ch) or dl-alpha-tocopherol acetate, 500 mg/kg, and beta-carotene, 30 mg/kg (V), on liver microsomal fluidity, cyt P450 content and aniline hydroxylase (AH), aminopyrine-N-dimethylase (AND) and UDP-glucuronyltransferase (UDP-GT) activities. Male Sprague-Dawley rats (n = 6/group) were fed semipurified diets containing 15% oil, without or with Ch or V, for 20 days. Dietary intake and feed efficiency were lower in rats fed F. Relative liver weight was higher in animals fed F, similar in O and H, and lower in the group fed C. The intake of V increased feed intake in C+V group and decreased the relative liver weight of F+V group, which also decreased with the intake of F+Ch. Ch intake increased the relative liver weight in all groups consuming vegetable oils. Cyt P450 content was higher in rats fed F. Decreased cyt P450 content was observed in C+Ch and F+Ch groups, while it augmented in H+Ch group. Mixture V increased cyt P450 in rats fed C+V, F+V and O+V. The highest membrane fluidity was observed in rats fed F. Fluidity was also higher in group H versus O or C. The intake of Ch decreased microsomal fluidity in all groups, while V induced an increase in microsomal fluidity in group O+V. Rats fed F exhibited higher enzyme activities. AND activity increased with V only in rats fed H+V, while AH activity increased with V intake in groups F+V and O+V. In the C+V group, fluidity was not affected by V, while the cyt P450 content and UDP-GT activity increased. The O+V group exhibited lower UDP-GT activity and higher fluidity and cyt P450 content. The activity of AH decreased in groups F+Ch and C+Ch. UDP-GT activity was higher in rats fed F. It diminished after the intake of Ch in H+Ch and F+Ch. These results indicate that although AH and AND act in the same microsomal metabolic pathway, their localization into the membrane may be determinant of their activity and the response to dietary lipids. It is shown that F intake exerts the most significant effects upon liver microsomal properties, e.g. higher fluidity, cyt P450 content and enzymatic activities, an effect that prevails over the intake of the supplements tested.     

Symposium über die Gesundheit und die Bewirtschaftung von freilebenden S?ugetieren in Nancy

Ohne Zusammenfassung     

Interrelation among flaw resistance, K-curve behavior and thermal shock strength degradation in ceramics. I. Theoretical considerations

This paper presents a new concept by which both the K^R-curve behavior and thermal shock strength degradation of a ceramic material can be predicted simultaneously by applying the ‘Vickers Indentation Strength in Bending (ISB)’ method.     

Grundsätzliche betrachtungen über den spülvorgang bei zweitaktmaschinen

Ohne Zusammenfassung VDI     

Maternal depressive symptomatology over the transition to parenthood: Assessing the influence of marital satisfaction and marital sex role traditionalism.

This longitudinal study examined the importance of the marital context in predicting maternal depressive symptomatology, as assessed with marital satisfaction and the endorsement of traditional sex role beliefs about the marriage, in 142 first-time mothers and their husbands or partners. Data were collected during pregnancy and at 6 weeks and 9 months infant age. Maternal and paternal reports about the marriage were assessed, and analyses were done on the way in which marital context scores interacted with earlier and concurrent levels of maternal depressive symptomatology. A hierarchical multiple regression analysis revealed that the final model explained 57% of the variance; marital context contributed 18% of the variance beyond that of earlier symptom levels in predicting mothers' depressive symptoms 9 months after the birth of the first child. (PsycINFO Database Record (c) 2010 APA, all rights reserved)