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  • Articles  (39)
  • 1995-1999  (38)
  • 1970-1974  (1)
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  • 1
    ISSN: 1432-0827
    Keywords: Key words: Human chondrocyte — Pulsed electromagnetic field —3H-thymidine — Nasal — Articular.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. 3H-thymidine incorporation was studied in cultured human nasal and articular chondrocytes exposed to low-energy, low-frequency pulsed electromagnetic fields (PEMFs) (75 Hz, 2.3 mT). The reverse transcriptase polymerase chain reaction (RT-PCR) analysis shows that human secondary chondrocytes derived from both nasal and articular cartilage express collagen type II mRNA, which is a specific marker of the chondrocyte phenotype. In a preliminary series of experiments, cells were exposed to PEMF for different time periods ranging from 6 to 30 hours (time-course), in medium supplemented with 10% or 0.5% fetal calf serum (FCS) and in serum-free medium. The ratios between the 3H-thymidine incorporation in PEMFs and control cultures show an increase of the cell proliferation in cultures exposed to PEMFs when serum is present in the culture medium, whereas no effect was observed in serum-free conditions. The increase in DNA synthesis, induced by PEMFs, was then evaluated only at the times of maximum induction and the results were analyzed by the three-factor analysis of variance (ANOVA). The data presented in this study show that even if 3H-thymidine incorporation is higher in nasal than in articular chondrocytes, PEMF induce an increase in the proliferation of both cell types. Moreover, the concentration of FCS in the culture medium greatly influences the proliferative response of human chondrocytes to the PEMF exposure. Though normal human osteoblast cells increase their proliferation when exposed to PEMFs if only 10% FCS is present in the medium, human chondrocytes are able to increase their cell proliferation when exposed to PEMFs in the presence of both 0.5% and 10% of FCS in the medium. The results obtained may help to explain the basic mechanisms of PEMF stimulation of fracture healing.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 105 (1999), S. 347-353 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. In humans, the poly(A)-binding proteins (PABPs) comprise a small nuclear isoform and a conserved gene family that displays at least three functional proteins : PABP1, inducible PABP (iPABP), and PABP3, plus four pseudogenes (1, 2, 3, and PABP4). In situ hybridization of PABP3 cDNA as the probe on metaphasic chromosomes have revealed five possible loci for this gene family at 2q21-q22, 13q11-q12, 12q13.3-q15, 8q22, and 3q24-q25. Amplifications of specific DNA fragments from a human-rodent somatic cell hybrid panel have allowed us to associate PABP1 and PABP3 with 8q22 and 13q11-q12, respectively. The iPABP gene has been assigned to chromosome 1. This result, compared with radiation hybrid database information, strengthens the location of this gene to 1p32-p36. The pseudogenes PABP4, 1, and 2 have been assigned to chromosomes 15, 4, and 14, respectively. Three loci detected on chromosome spreads are not associated with any amplified fragment. They might represent other related PABP genes not yet identified.
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  • 3
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Cette étude, portant sur 6.400 métaphases intéressant 128 personnes, a montré que les parents de trisomiques 21 ont davantage d'associations entre acrocentriques, davantage d'associations multiples et un plus grand nombre de chromosomes intéressés dans les associations. Ces caractères ne varient ni avec le sexe, ni avec l'âge. Il existe d'autre part une différence très significative dans la distribution des différents types d'associations. Chez les parents de trisomiques 21, toutes les associations avec le chromosome 15 sont diminuées, toutes les associations avec le chromosome 22 sont augmentées, sauf l'association 22/15, et, enfin, concernant le chromosome 21, seule l'association 21/22 est augmentée. Nous avons encore constaté que les associations entre homologues étaient significativement plus rares que les associations entre hétérologues. Cette distribution est significativement différente chez les parents de trisomiques 21 où il y a davantage d'associations entre homologues et ceci par la seuleaugmentation des associations 22/22. Enfin, chez les parents de trisomiques, les chromosomes 21, 22 et 14 sont significativement plus souvent associés. Les autres aspects concernant les associations avec l'Y ou d'autres régions chromosomiques ont été répertoriés.
    Notes: Summary Association patterns of acrocentric chromosomes in 6400 metaphases from a sample population of 64 parents of normal children and 64 parents of mongol children have been studied. The individual pairs of acrocentric chromosomes were identified by coloration with Quinacrine Mustard and by heat-controlled denaturation. The data are concerned with the frequency of association, frequency of different association types by the number of associating chromosomes, and frequency of different associations by the type of associating chromosomes. The parents of mongol children have more satellite association (s.a) and more complex associations. There is a statistically significant difference in the distribution of the s.a. by the types of associating chromosomes. In the parents of mongol children the chromosome 15 is less associated, all the s.a. with the chromosome 22 are increased except the 22/15 and, in the case of the chromosome 21, only the s.a. 21/22 is more frequent. S.a. between homologous chromosomes is significantly less frequent that the s.a. between heterologous chromosomes. This distribution is significantly different in the parents of mongoloid children in which there are more s.a. between homologous chromosomes only by the increase of s.a. 22/22. Lastly, in the parents of mongoloid children, chromosomes 21, 22, and 14 are significantly more often associated.
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  • 4
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  We present the cloning, structural analysis, and mapping of new members belonging to two multigenic families, the B30-RING finger family and the B7.1-B7.2 family, as well as two genes derived by exon shuffling from members of these families. Eight new members were found and three of them map to the human major histocompatibilitiy complex (MHC) region. Phylogenic and physical mapping analysis allowed us to decipher the evolutionary story of these two multigenic families and to shed light on the evolution of the MHC region. We also show that a deductive analysis can be used to predict the existence of a given gene.
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  • 5
    ISSN: 1573-6849
    Keywords: human bivalent 15 ; meiosis ; sex vesicle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Using fluorescent in-situ hybridization, we investigated the positioning of different human bivalents at the pachytene stage of normal male meiosis. We showed that, in about 35% of nuclei, the pericentromeric region of bivalent 15 is closely associated with the sex vesicle (SV). This behaviour may be linked to the presence of three domains in the pericentromeric region of chromosome 15: a large imprinted domain, a nucleolar organizing region (NOR), and a heterochromatic block. In order to define the domains of chromosome 15 involved in this association, we analysed the meiotic behaviour of other bivalents with similar domains: human bivalent 11 and mouse bivalent 7, bearing imprinted domains, other human acrocentric bivalents bearing a NOR, and the human bivalents 1, 9 and 16 containing a heterochromatic region. None of these bivalents were as frequently associated with the SV as the human bivalent 15. Nevertheless, we suggest that the bivalent 15 heterochromatin may be responsible for the association because of two properties: its telomeric location on chromosome 15 and its strong sequence homology with the Yq heterochromatin. This phenomenon could explain the high frequency of translocations between the chromosome 15 and the X or Y chromosomes.
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  • 6
    ISSN: 1432-1777
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Pigmentation of Drosophila eyes requires the concerted action of several genes, most of which have been cloned and characterized. Three of them, white, brown, and scarlet, have been directly implicated in the import of pigment precursors into the cells. These three genes encode similar proteins, belonging to the evolutionary conserved family of ATP Binding Cassette transporters. The identification of a novel mouse gene, ABC8, closely related to white is reported here, together with an analysis of its expression profile and its comparative mapping in mouse and human genome.
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  • 7
    ISSN: 1432-1777
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
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  • 8
    ISSN: 1432-1777
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
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  • 9
    ISSN: 1432-1777
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
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  • 10
    ISSN: 1432-1777
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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