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  • 1975-1979
  • 1970-1974  (6)
  • 1970  (6)
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  • 1975-1979
  • 1970-1974  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Histochemistry and cell biology 21 (1970), S. 181-188 
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Es wird ein Verfahren zur elektiven Fluorochromierung Aldehydfuchsin-positiver Gewebsstrukturen beschrieben. Bei dem verwendeten Fluorochrom handelt es sich um eine Verbindung, die aus Crotonaldehyd und 4,4′-Diamino-benzophenon entsteht. Die nach dieser Methode gefärbten Schnitte können ohne Beeinträchtigung ihrer Fluoreszenz in Eukitt eingeschlossen und aufbewahrt werden. Das fluoreszenzoptische Verhalten der mit „Crotonaldehyd-Diaminobenzophenon“ fluorochromierten Strukturen wird mikrospektrofluorometrisch untersucht.
    Notes: Summary A staining procedure is described for the specific fluorochromation of tissue structures which are aldehyde fuchsin-positive. The fluorochrome is formed by a reaction of crotonaldehyde with 4,4′-diamino-benzophenone. The tissue sections stained by this technique can be mounted and preserved in Eukitt without alteration of their fluorescence. Structures fluorochromized with “crotonaldehydediaminobenzophenone” have been investigated by means of microspectrofluorometry.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Histochemistry and cell biology 21 (1970), S. 353-365 
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Im Tanycytenependym des III. Ventrikels kommen bei der Wistarratte unspezifische, E 600-empfindliche und gegenüber p-Chlormercuribenzoat resistente Esterasen vor. Um diese Enzyme histochemisch weiter zu charakterisieren, wurde ihre Fähigkeit geprüft, verschiedene Naphthol-Carbonsäureester bei Anwesenheit von Lösungsvermittlern zu spalten. Es zeigte sich hierbei ein unterschiedliches Verhalten der Esterasen in Ganglienzellen und Tanycyten. In letzteren weist von verschiedenen homologen Carbonsäureestern des α-Naphthols der Buttersäureester die höchste Spaltungsrate auf; Acetatester der Naphthol-AS-Reihe ergeben unterschiedliche, aber stets schwächere Reaktionen als α-Naphthylacetat. Wie in früheren Untersuchungen wurden Unterschiede im Verhalten der Esterasen-Aktivität in Perikaryen und Fortsätzen der Tanycyten beobachtet. — Auf Grund der Befunde wird die Möglichkeit einer Einschaltung der Tanycytenesterasen in die Erregungsübertragung diskutiert.
    Notes: Summary In the Wistar rat, the tanycytes of the IIIrd ventricle contain unspecific esterases which are E 600 sensitive and are not inhibited by p-chlormercuribenzoate. To further investigate the character of these enzymes, their ability to split various naphtholcarbonic acid esters in the presence of organic solvents was tested. It was hereby established that the esterases of the tanycytes behave differently to those of the diencephalic nerve cells. In the tanycytes among various homologous carbonic acid esters of α-naphthol applied, α-naphthyl butyrate shows the highest splitting ratio; with acetate esters of AS-naphtholes differing but always weaker reactions are obtained than with α-naphthyl-acetate. As in a former study, behavioral divergencies of esterase activity in the tanycyte perikaria and processes were observed. — On the basis of these findings the possibility is discussed that the esterases of the tanycytes might play a role in synaptic transmission.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-3297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Description / Table of Contents: Résumé La variance des scores du test d'intelligence verbale de Wechsler à l'intérieur de paires de jumeaux dizygotes a été comparée pour un groupe de jumeaux concordants et pour un groupe de jumeaux discordants pour chacun des quatre systèmes de groupes sanguins (ABO, MNSs, Rh, Duffy). On a trouvé une variance significativement supérieure chez les jumeaux discordants pour les systèmes Rh et Duffy. On envisage plusieurs explications possibles, mais il semble que la cause la plus probable soit le “linkage” entre la localisation du gène du groupe sanguin et d'un gène important pour l'intelligence verbale. ZUSAMMENFASSUNG-Die Intrapaarvarianz verbaler Intelligenztestscores (Wechsler) bei dizygoten Zwillingen mit übereinstimmender bzw. verschiedener Blutgruppe (ABO, MNSs, Rh, Duffy) wurde verglichen. Für zwei der vier untersuchten Blutgruppen (Rh und Duffy) wurde signifikant grössere Yarianz zwischen Zwillingen gefunden, die unterschiedlichen Blutgruppen angehörten. Verschiedene mögliche Erklärungen dieses Ergebnisses werden erwogen; “linkage” des Genortes für die betreffende Blutgruppe mit dem Locus eines der wichtigeren Gene für verbale Intelligenz wird als die wahrscheinlichste vorgeschlagen.
    Notes: Abstract Within pair variances of Wechsler verbal intelligence test scores have been compared for fraternal twins that are concordant and those that are discordant for each of four bloodgroup system (ABO, MNSs, Rh, Duffy). Significantly increased variances for twins discordant for the Rh system and for Duffy were found. Several possible explanations are considered but it is proposed that linkage between the bloodgroup locus and the locus of a major gene for verbal intelligence is the most likely cause.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Psychometrika 35 (1970), S. 179-197 
    ISSN: 1860-0980
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology
    Notes: Abstract A method of estimating the parameters of the normal ogive model for dichotomously scored item-responses by maximum likelihood is demonstrated. Although the procedure requires numerical integration in order to evaluate the likelihood equations, a computer implemented Newton-Raphson solution is shown to be straightforward in other respects. Empirical tests of the procedure show that the resulting estimates are very similar to those based on a conventional analysis of item “difficulties” and first factor loadings obtained from the matrix of tetrachoric correlation coefficients. Problems of testing the fit of the model, and of obtaining invariant parameters are discussed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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