Refine
Year of publication
- 1993 (58) (remove)
Document Type
- Article (36)
- Postprint (16)
- Monograph/Edited Volume (5)
- Review (1)
Language
- English (58) (remove)
Keywords
- EROSION (1)
- KINETIC-ENERGY (1)
- MESOSCALE CONVECTIVE COMPLEXES (1)
- UNITED-STATES (1)
- complement (1)
- flow (1)
- glucose (1)
- lactate output (1)
- prostaglandin-f2-alpha (1)
Institute
- Institut für Biochemie und Biologie (10)
- Institut für Chemie (10)
- Department Psychologie (8)
- Institut für Mathematik (8)
- Institut für Ernährungswissenschaft (4)
- Department Erziehungswissenschaft (2)
- Extern (2)
- Institut für Anglistik und Amerikanistik (2)
- Institut für Religionswissenschaft (2)
- Interdisziplinäres Zentrum für Dynamik komplexer Systeme (2)
- Department Linguistik (1)
- Historisches Institut (1)
- Institut für Geowissenschaften (1)
- Institut für Informatik und Computational Science (1)
- Institut für Jüdische Studien und Religionswissenschaft (1)
- Institut für Philosophie (1)
- Institut für Physik und Astronomie (1)
- Institut für Romanistik (1)
- Institut für Umweltwissenschaften und Geographie (1)
- Philosophische Fakultät (1)
- Sozialwissenschaften (1)
This article presents results from a meta-analysis of studies on the relation between subject-matter-related interest and school achievement. For the time period between 1965 and 1990 a total of 21 studies reporting 127 independent correlations (i. e., correlations based on independent samples) were identified. For the overall relation between interestand achievement a mean correlation of .30 was found. Male students exhibited significantly higher interest-achievement correlations than female students. In addition, significant differences among school subjects were observed. Grade level, however, did not produce a significant moderator effect. Finally, the results are discussed on the basis of theories of interest and methodological considerations.
Several zwitterionic polymers were prepared by radical homopolymerization of surfactant monomers which bear diallyl, diene or vinylcyclopropane moieties. These polymer systems were complemented by alternating copolymers of appropriate zwitterionic vinyl compounds. Thus, polymers with reduced (as compared with simple vinylic homopolymers, or statistical copolymers) and well defined density of surfactant side groups are obtained. The solubilities found for these polymers are dominated by polymer geometry rather than by the balance of hydrophilic and hydrophobic fragments, thus corroborating a main-chain spacer model proposed recently. All water-soluble polymers exhibit characteristic features of classical polysoaps, as shown by surface tension measurements and by solubilization of hydrophobic dyes. In contrast, the water-insoluble copolymers are capable to form stable monolayers at the air-water interface.
This article describes recent achievements in the field of micellar polymers, or polysoaps. Taking advantage of zwitterionic model polymers, systematic variations of the molecular architecture have provided an improved understanding of the relationship between the molecular structure of the polymers and their key properties such as surface activity and solubilization capacity. Useful rules are established, which take into account much of the previous data in the literature.
Excerpt: The shrill sounds of the now seemingly outdated controversy between Gershom Scholem and Martin Buber at the beginning of the sixties are still in the minds of every student of Hasidic literature and thought. - The "Scholem-community" feels content and the "Buber-community" upset. We can summarize the case in a few words. Martin Buber, the pioneer of Hasidism in the Western World, held the position that whoever would want to understand Hasidism had to turn to Hasidic tale as here, in the tales of the Hasidim, real Hasidic life was to be found. Whereas in the Hasidic homilies we meet mere non-creative tradition especially in the form of Kabbalah. Buber did not totally deny the importance of the Hasidic Midrash but he regarded it just as a commentary, i.e. as secondhand material, whereas, in his view, the tale was a true mirror of real Hasidic life [...]
Excerpt: The writings from the thirteenth century called by Gershom Scholem the "Writings of the 'lyyun circle" are one of the most intriguing chapters of early kabbalah - this I need not to elaborate on as it is a well known fact to anyone whoever had read these texts or the literature about them. When reading these texts, one gets the impression as if the authors had at hand a box full of terms and phrases into which everybody could just stick his hand and take terms and phrases out of it in order to arrange them according to his own taste, disregarding the meaning they have in the writings of his fellow kabbalists. The result was, that we now have before us a large number of varying mosaic pictures in which we detect again and again the same mosaic pebbles, however composed differently.
Rainfall erosivities as defined by the R factor from the universal soil loss equation were determined for all events during a two-year period at the station La Cuenca in western Amazonia. Three methods based on a power relationship between rainfall amount and erosivity were then applied to estimate event and daily rainfall erosivities from the respective rainfall amounts. A test of the resulting regression equations against an independent data set proved all three methods equally adequate in predicting rainfall erosivity from daily rainfall amount. We recommend the Richardson model for testing in the Amazon Basin, and its use with the coefficient from La Cuenca in western Amazonia.
Increase in prostanoid formation in rat liver macrophages (Kupffer cells) by human anaphylatoxin C3a
(1993)
Human anaphylatoxin C3a increases glycogenolysis in perfused rat liver. This action is inhibited by prostanoid synthesis inhibitors and prostanoid antagonists. Because prostanoids but not anaphylatoxin C3a can increase glycogenolysis in hepatocytes, it has been proposed that prostanoid formation in nonparenchymal cells represents an important step in the C3a-dependent increase in hepatic glycogenolysis. This study shows that (a) human anaphylatoxin C3a (0.1 to 10 mug/ml) dose-dependently increased prostaglandin D2, thromboxane B, and prostaglandin F2alpha formation in rat liver macrophages (Kupffer cells); (b) the C3a-mediated increase in prostanoid formation was maximal after 2 min and showed tachyphylaxis; and (c) the C3a-elicited prostanoid formation could be inhibited specifically by preincubation of C3a with carboxypeptidase B to remove the essential C-terminal arginine or by preincubation of C3a with Fab fragments of a neutralizing monoclonal antibody. These data support the hypothesis that the C3a-dependent activation of hepatic glycogenolysis is mediated by way of a C3a-induced prostanoid production in Kupffer cells.