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S Hübner

Publications and source records attributed to S Hübner.

27 records · Page 2Linked to original sources
PubMed1995

[Inductive reasoning and intelligence test performance--analysis of the manner of the effect of 2 thought training methods for children].

For his training programs of inductive reasoning Klauer postulates a transfer effect to inductive thinking as well as to (performance in tests of) intelligence. As evidence for these claims, however, he uses the same data. That means the same tests are used to prove enhancement of inductive thinking and to prove transfer to performance in tests of intelligence. Moreover, Klauer's claim to train inductive thinking is criticized since better performances in at least some of the tests he administers can result due to enhancements in the area of visual perception. Finally, we ask what kind of effects the programs result in: Are they mere coaching effects or do the programs result in better performance due to enhanced competencies? The empirical evidence suggest that positive effects on inductive thinking do not last as long as perceptual competencies that are necessarily fostered when visual material is presented to children.

Adolescent↗
PubMed1993

Anion exchanger 1 in human kidney and oncocytoma differs from erythroid AE1 in its NH2 terminus.

Acid-secreting intercalated cells of the kidney collecting duct and tumor cells of renal oncocytoma express an anion exchanger that is immunologically related but not identical to the chloride-bicarbonate anion exchanger of erythrocytes (AE1). In this study, we have mapped the binding site of a monoclonal antibody against erythroid AE1 that does not react with either intercalated cells or oncocytoma. The epitope is located close to the NH2 terminus of AE1, indicating that AE1 in intercalated cells and oncocytoma differs in its NH2 terminus from erythroid AE1. This conclusion was supported by an antibody directed against residues 1-14 of erythroid AE1 that does not react with intercalated cells in oncocytoma. Polymerase chain reaction performed with mRNA from a human kidney revealed that the sequence containing the codons for Met-1 and Met-33 in erythroid mRNA is missing in the kidney transcript, whereas the sequence coding for Met-66 is present. DNA sequence data derived from cloning the 5' end of the human kidney AE1 mRNA clearly showed that the 5' untranslated region comprises part of intron 3, the complete exon 4 that is followed by exon 5 containing Met-66 as the site of translation initiation. Altogether, the results indicate that AE1 in the human kidney is an amino-terminally truncated form of erythroid AE1 that is restricted to the basolateral membrane domain of the acid-secreting intercalated cells of the collecting duct and is also expressed in oncocytoma.

Adenoma, Oxyphilic↗
PubMed1992

Amino acid sequence of band-3 protein from rainbow trout erythrocytes derived from cDNA.

In this report we present the first complete band-3 cDNA sequence of a poikilothermic lower vertebrate. The primary structure of the anion-exchange protein band 3 (AE1) from rainbow trout erythrocytes was determined by nucleotide sequencing of cDNA clones. The overlapping clones have a total length of 3827 bp with a 5'-terminal untranslated region of 150 bp, a 2754 bp open reading frame and a 3'-untranslated region of 924 bp. Band-3 protein from trout erythrocytes consists of 918 amino acid residues with a calculated molecular mass of 101 827 Da. Comparison of its amino acid sequence revealed a 60-65% identity within the transmembrane spanning sequence of band-3 proteins published so far. An additional insertion of 24 amino acid residues within the membrane-associated domain of trout band-3 protein was identified, which until now was thought to be a general feature only of mammalian band-3-related proteins.

Amino Acid Sequence↗
PubMedDate not supplied

[Cognitive training and strategy behavior: comparative evaluation of 2 cognitive training programs].

Combining a non-comparative with a comparative evaluation, two modern programs for fostering inductive reasoning, namely the German version of the "Cognitive training for children" by Klauer and Phye (1994; Klauer 1989), and the "DenkMit" by Sydow and Meincke (1994), are compared to each other and to a control program which intends to enhance aspects of memory instead of inductive reasoning. The programs were performed with N = 49 children between six and eight years who had been postponed from regular school because of various reasons or who had been selected as especially in need for particular interventions from first classes. Besides the psychometric test often used for assessing inductive reasoning, i.e. three subtests of the German form of the Culture Fair Test by Cattell (Weiss a. Osterland 1980), tasks of concept formation were applied for assessing changes in strategic behavior of children--a type of task which has been used in connection with inductive reasoning since many years. Counter to expectations, the children whose memory was trained, showed changes in performance in the psychometric test in a similar size as the children whose inductive reasoning was trained. These effects are interpreted in terms of special attention directed to the children during the intervention situation. Moreover, it was found that despite the authors claim to the opposite the DenkMit did not cause any changes in visual perception. In contrast to the author's intentions, the "Cognitive Training for Children" did cause some substantive changes in the area of visual perception. The pattern of results with the concept formation tasks, however, overall indicates that the reasoning programs caused some changes in strategic behaviors of the children. Although these changes are not very impressive, they cannot be attributed to extraneous factors such as special attention.

Attention↗