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Several types of insect cuticle contain enzymes catalyzing the formation ofof adducts between N-acetyldopamine (NADA) and N-acetylhistidine (NAH). Two such adducts, NAH-NADA-I and NAH NADA-II, have been isolated and their structures determined. In one of the adducts the link connecting the two residues occurs between the I-position (ß-position) in the NADA side chain and the 1-N atom (τ-N) in the imidazole ring of histidine. Diphenoloxidase activity alone is not sufficient for formation of this adduct, whereas extracts containing both diphenoloxidase and o-quinone-p-quinone methide isomerase activities catalyze the coupling reaction. The adduct consists of a mixture of two diastereomers and they are presumably formed by spontaneous reaction between enzymatically produced NADA-p-quinone methide and N-acetylhistidine. The other adduct has been identified as a ring addition product of N-acetylhistidine and NADA. In contrast to the former adduct it can be formed by incubation of the two substrates with mushroom tyrosinase alone. An adduct between N-acetylhistidine and the benzodioxan-type NADA-dimer is produced in vitro, when the N-acetylhistidine-NADA adduct is incubated with NADA and locust cuticle containing a 1,2-dehydro-NADA generating enzyme system. Trimeric NADA-polymerization products of the substituted benzodioxan-type have been obtained from in vivo sclerotized locust cuticle, confirming the ability of cuticle to produce NADA-oligomers. The results indicate that some insect cuticles contain enzymes promoting linkage of oxidized NADA to histidine residues. It is suggested that histidine residues in the cuticular proteins can serve as acceptors for oxidized NADA and that further addition of NADA-residues to the phenolic groups of bound NADA can occur, resulting in formation of protein-linked NADA-oligomers. The coupling reactions identified may be an important step in natural cuticular sclerotization.
School performance and adjustment of Greek remigrant students in the schools of their home country
(1992)
This study explores the adjustment of Greek remigrant students in Greek public schools after their families' return to Greece from the Federal Republic of Germany. Teacher and self-rating instruments were used, and achievement and language competence data were obtained. The sample consisted of 13- to 15-year-old junior high school students in northern Greece. The remigrant students were divided into two groups ("early return" and "late return"), based on the year of return to Greece. The control group consisted of all the local classmates of these students. Remigrant students (mainly late return) were found to experience difficulties mainly in the language/learning domain and less in the interpersonal and intrapersonal behavior domains.
The molecular packing and spatial correlations of two isomeric zwitterionic polymethacrylates and one polyacrylate analog are studied by means of X-ray analysis and conformational calculations. The analysis of the correlation functions and density distribution profiles suggest a double-layered molecular packing which is discussed for the three polymers investigated, with respect to their different chemical structures. Whereas the zwitterionic polymethacrylates studied exhibit liquid-like short-range order, the polyacrylate analog exhibits an ordered double-layered superstructure.
Content: 1 Persons and Situations: Cornerstones of Modern Personality Psychology 2 The Issue of Consistency in Personality:Sixty Years of Controversy 3 In Defence of Traits: New (and Revived) Perspectives 4 Modern Interactionism: An Alternative Framework for Personality Research 5 Implementing the Interactionist Programme:Three Exemplary Areas of Research 6 Improving Personality Measurement:The Nomothetic Road to the Study of Consistency 7 Personality Psychology is about Individuals:Rediscovering the Idiographic Legacy 8 The Role of the Situation in Personality Research 9 Personality Psychology in the Nineties: An Outlook
Content: Synopsis The Attitudes toward Rape Victims Scale: Psychometric Data from 14 Countries Scale Construction and Validation - Study One: Preliminary Analyses - Study Two: Test-Retest Reliability - Study Three: Construct Validity Cross-cultural Extensions - United States - United Kingdom - Germany - New Zealand - Canada - West Indies - Israel - Turkey - India - Hong Kong - Malaysia - Zimbabwe - Mexico - Metric Equivalence Discussion
Content: Introduction: Do the Arts Really Matter? Aesthetic Cognition and Human Development The Significance of Arts in Everyday Life: Evidence from Case StudiesArts and Quality of Experience: A Systematic Analysis The Conditions of Optimal Experience The Representation of Experience in Personality Consequences for Teaching the Arts
Content Social stereotypes and responsibility attributions to victims of rape Atributing responsibillty to rape victims: a German study Rape myth acceptance and responsibility judgments: a British study Police officers' definitions of rape A study on cognitive prototypes of rape Conclusion References