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  • Springer  (76)
  • National Academy of Sciences  (19)
  • American Institute of Physics  (12)
  • Public Library of Science  (12)
  • 2015-2019  (64)
  • 1985-1989  (32)
  • 1975-1979  (16)
  • 1970-1974  (7)
  • 1955-1959
  • 2018  (64)
  • 1986  (14)
  • 1985  (18)
  • 1975  (16)
  • 1973  (7)
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  • 2015-2019  (64)
  • 1985-1989  (32)
  • 1975-1979  (16)
  • 1970-1974  (7)
  • 1955-1959
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Order 3 (1986), S. 15-20 
    ISSN: 1572-9273
    Keywords: 06A10 ; Partially ordered set
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Let P be a partially ordered set. Define k = k (P) = max p∈ |{x ∈ P : p 〈 x or p = x}|, i.e., every element is comparable with at most k others. Here it is proven that there exists a constant c (c 〈 50) such that dim P 〈 ck(log k)2. This improves an earlier result of Rödl and Trotter (dim P ≤2 k 2+2). Our proof is nonconstructive, depending in part on Lovász' local lemma.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of environmental contamination and toxicology 13 (1975), S. 506-512 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A new deficient G-6PD variant, Gd(-) Abrami, was found in granulocytes, platelets and red blood cells of a 65-year-old woman with myelofibrosis. Enzyme and immunological titrations showed that only the deficient variant was present in blood cells whereas both the normal and abnormal enzymes were found in the fat cells of this patient. These results seem to indicate that the granulocytes, platelets and erythrocytes of this woman with myelofibrosis have arisen from a single abnormal precursor the functional X chromsome of which is the one carrying the abnormal G-6PD gene.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 18 (1973), S. 261-270 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Les auteurs ont dosé l'activité et déterminé la migration électrophorétique de la glucose-6-phosphate déshydrogénase érythrocytaire chez 301 sujets mâles de race noire. Les enzymes de migration anormale et/ou déficitaires ont été semi-purifiées et totalement caractérisées sur le plan cinétique et thermodynamique; 9 phénotypes différents ont ainsi été séparés: $$\begin{gathered} {\text{199 Gd ( + ) B, soit 66,1\% 2 Gd ( + ) Madrona}} \hfill \\ {\text{ 59 Gd ( + ) A, soit 19,6\% 1 Gd ( + ) Baltimore}} \hfill \\ {\text{ 24 Gd ( - ) A, soit 8\% 1 Gd ( + ) Martinique}} \hfill \\ {\text{ 12 Gd ( - ) Mali, soit 4\% 1 Gd ( - ) Matam}} \hfill \\ {\text{ 2 Gd ( - ) Dakar}} \hfill \\ \end{gathered} $$ De plus, une variante très lente a été découverte à l'état hétérozygote chez une femme martiniquaise mais n'a pu être caractérisée. Sa mobilité était de 65 à 70% de la normale. La fréquence des enzymes de phénotype Gd(-) Mali qui représentent la majorité des déficits dans le groupe Sénégal-Mali est discutée. De même a été émise l'hypothèse que les phénotypes Gd(-) Dakar et Gd(-) Matam pouvaient être dus à un événement génétique ayant intéressé un gène «A» (A (+) ou A (-)). Le phénotype Matam qui représente une enzyme de migration «A» cinétiquement indistinguable des enzymes «Mali» peut évoquer une recombinaison intracistronique entre ces deux gènes dans une région où tous deux sont fréquents. Enfin, aucune corrélation n'est retrouvée entre les déficits en G-6PD et les hémoglobinopathies A+S, A+C et S+C.
    Abstract: Zusammenfassung Die Aktivität und die elektrophoretische Charakteristik der Glucose-6-Phosphat-Dehydrogenase aus Erythrocyten bei 301 männlichen in Frankreich lebenden Versuchspersonen schwarzer Hautfarbe wurde bestimmt. Die Enzyme mit anormaler elektrophoretischer Charakteristik und/oder verminderter Aktivität sind partiell angereichert und kinetisch und thermodynamisch vollständig charakterisiert worden; derart wurden 9 verschiedene Phäntypen dargestellt. $$\begin{gathered} {\text{199 Gd ( + ) B zu 66,1\% 2 Gd ( + ) Madrona}} \hfill \\ {\text{ 59 Gd ( + ) A zu 19,6\% 1 Gd ( + ) Baltimore}} \hfill \\ {\text{ 24 Gd ( - ) A zu 8\% 1 Gd ( + ) Martinique}} \hfill \\ {\text{ 12 Gd ( - ) Mali zu 4\% 1 Gd ( - ) Matam}}{\text{.}} \hfill \\ {\text{ 2 Gd ( - ) Dakar}} \hfill \\ \end{gathered} $$ Darüber hinaus wurde eine sehr langsame Variante entdeckt, und zwar heterozygot bei einer Frau von Martinique. Diese Variante konnte nicht vollständig charakterisiert werden. Ihre elektrophoretische Beweglichkeit betrug 65 bis 70% des Normalwertes. Die Häufigkeit der Enzyme vom Phänotypen Gd(-) Mali, die die Mehrheit der Defekte in der Gruppe Sénégal-Mali ausmachen, wird ausführlich besprochen. Weiterhin wird die Hypothese aufgestellt, daß die Phänotypen Gd(-) Dakar und Gd(-) Matam von einer genetischen Modifikation herrühren, die ein Gen A (A (+) order A (-)) betreffen. Der Phänotyp Matam, der ein Enzym vom Typ A ist und der kinetisch den Enzymen Mali gleicht, läßt an eine Rekombination zwischen diesen beiden Genen in einem Gebiet denken, in dem beide häufig vorkommen. Schließlich findet sich keinerlei Korrelation zwischen den Defizienzen an G-6-PD und den Hämoglobinopathien A+S, A+C und S+C.
    Notes: Summary The activity of erythrocytic glucose-6-phosphate dehydrogenase was assayed and its electrophoretic mobility determined in 301 male black people. The enzymes of abnormal mobility with/or without deficiency were partially purified and totally characterized from a kinetic and thermodynamic aspect; 9 different phenotypes were separated: $$\begin{gathered} {\text{199 Gd ( + ) B, i - e 66,1\% 2 Gd ( + ) Madrona}} \hfill \\ {\text{ 59 Gd ( + ) A, i - e 19,6\% 1 Gd ( + ) Baltimore}} \hfill \\ {\text{ 24 Gd ( - ) A, i - e 8\% 1 Gd ( + ) Martinique}} \hfill \\ {\text{ 12 Gd ( - ) Mali, i - e 4\% 1 Gd ( - ) Matam}} \hfill \\ {\text{ 2 Gd ( - ) Dakar}} \hfill \\ \end{gathered} $$ Moreover, a very slow variant was discovered in the heterozygous state in a woman from Martinique. Its mobility was about 65–70% of normal. The frequency of the Gd(-) Mali phenotype enzymes, which represents the majority of the G-6PD variants with deficiency in the Senegal-Mali group, is discussed. In the same way, it was suggested that both Gd(-) Dakar and Gd(-) Matam phenotypes could be due to a genetic change for an A gene (A (+) or A (-)). The Matam phenotype, representing an enzyme of “A” mobility which cannot be kinetically distinguished from the Mali enzymes, may suggest a recombination between both genes in a country where they are frequent. Finally no correlation was found between G-6PD deficiency and the A/S, A/C and S/C haemoglobin diseases.
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  • 5
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A new case of glucose phosphate isomerase deficiency associated with congenital nonspherocytic hemolytic anemia is described in a 12-year-old girl of Spanish origin. The parents exhibited erythrocyte glucose phosphate isomerase activity between 50 and 60% of normal. The enzyme of the propositus had normal Michaelis-Menten constants both for F-6-P and G-6-P, but abnormal pH optimum and decreased heat stability at 48°C. On starch-gel electrophoresis the father's enzyme was normal but the mother's showed a cathodic migrating band in addition to the normal one. The enzyme from the propositus exhibited only one band with cathodal mobility of 116% of the main band found in normal subjects. It is postulated that the propositus is double heterozygous for two abnormal alleles, and the mother contributes a mutant allele with abnormal electrophoretic mobility and thermolability at 48°C whereas the father contributes an allele without enzymatic activity.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 29 (1975), S. 271-280 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Erythrocyte pyruvate kinase (PK) from 5 patients with congenital non-spherocytic hemolytic anemia and erythrocyte PK deficiency have been studied by immunological methods and electrofocusing. L type immunologically related PK was titrated in crude hemolysate with anti human liver L type PK rabbit serum and M2 type immunologically related PK with anti human leukocyte M2 type PK serum. After partial purification, molecular specific activity of erythrocyte PK was measured by immunoinactivation and electroimmunodiffusion with anti L type PK serum. Partially purified erythrocyte PK was focused on continuous sucrose gradient with 2% ampholines covering the pH range 5–8. PK enzymatic deficiency was due two times to a lowered molecular specific activity of the PK variants, the concentration of PK antigen being in the normal range. In the 3 other cases enzyme activity and immunological reactivity were likewise lowered. In the 2 patients with the most marked erythrocyte PK deficiency about 50% of the residual activity in crude hemolysate were non inhibited by anti L type PK serum, but were inhibited by anti M2 type PK serum. In 3 patients, the electrofocusing pattern of partially purified PK was significantly different from that of normal controls. In conclusion, the heterogeneity of the molecular mechanisms of the deficiency on the one hand, and the abnormalities of electrofocusing patterns on the other hand, seem to indicate that erythrocyte PK deficiency is due to the synthesis by muted structural genes of various abnormal PK molecules. The high ratio of M2 type PK in the most deficient hemolysates may be due to a compensatory process.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 27 (1975), S. 247-250 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A new G-6PD variant with enzyme deficiency is described in a 7-month-old Turkish boy without any hemolytic manifestation, except neonatal hyperbilirubinemia. The main characteristics of this variant were the following: Severe enzyme deficiency in erythrocytes (8% of normal), fast starch-gel-electrophoretic mobility (110% of normal), increased Ki NADPH with respect to NADP+, slightly biphasic pH curve, enzyme instability, in vivo and in vitro, decreased molecular specific activity (58% of normal).
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  • 8
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The individual contributions of the first two external domains of the HLA-B7 heavy chain to the expression of allele-specific (B7) and locus-specific (B and C) antigenic determinants were investigated using hybrid class I genes. Hybrid genes were constructed in vitro by exon shuffling between the parent genes HLA-B7, HLA-Cw3, HLA-A3, and H-2K d, and their expression was monitored following transfection into mouse L cells. The results show that most allele-specific antigenic determinants are associated with the first external domain of the 137 heavy chain, whereas all the locus-specific antigenic determinants tested map to the second external domain.
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  • 9
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract A scheme for visual pattern recognition is described. It is supposed, amongst other things, that patterns are internally represented by the visual system in terms of local features, spatial-order relations between local features, and global spatial relations specifying approximate pattern position with respect to the point of fixation. It is further supposed that there are two distinct types of internal operation that may be applied to the components of internal representations in the process of pattern comparison: typically a discrete spatial-order-reversal operation and a continuous position-shift operation. Some general predictions of the scheme are tested against data obtained in an experiment using random-dot patterns that were subjected to rigid transormations and presented at various locations along the horizontal meridian. Patterns were presented sequentially, in pairs, to subjects in a “same-different” comparison task. Pattern pairs were to be responded to as “same” if they were identical or related by point-inversion (planar rotation through 180°) or responded to as “different”. Extending earlier findings, the present results showed that “same”-detection performance for identical and point-inverted patterns depended differentially on the distance between the patterns and the symmetry of the pattern positions about the point of fixation in a manner consistent with the predictions of the scheme.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 28 (1973), S. 311-311 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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