Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 11
    Electronic Resource
    Electronic Resource
    Changes of telomere lengths in human intracranial tumours (1993)
    Springer
    Human genetics 〈Berlin〉 91 (1993), S. 190-192 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The termini of human chromosomes comprise stretches of G-rich repeats that are about 5–20 kilobase (kb) in length. The size of the telomeres can be determined by hybridization with probes specific for these (ttaggg)n sequences after digestion of chromosomal DNA with appropriate restriction enzymes and electrophoretic separation of the fragments. Here, probing with the 32P-labelled synthetic (TTAGGG)3 oligonucleotide revealed length changes of the telomeres occurring in intracranial tumours. Among 60 samples analysed, 41.7% showed telomere elongation, and 21.7% telomere reduction, whereas 36.7% of the tumours exhibited equal lengths compared with the patients' peripheral blood leukocytes. Most of the elongated glioma telomeres exceeded in length those of untransformed astrocytes derived from human fetal tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222724
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    Selected di- and tetranucleotide microsatellites from chromosomes 7, 12, 14, and Y in various Eurasian populations (1994)
    Springer
    Human genetics 〈Berlin〉 93 (1994), S. 592-596 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Microsatellite polymorphisms of nine Eurasian populations (〉1200 chromosomes) were analyzed for the following loci: i) intronic (gt) n stretches of three T cell receptor (TCR) B loci on chromosome 7 (TCRBV6S1, TCRBV6S3, TCRBV6S7); ii) an intergenic (gt) n repeat in the region between the TCRDV3 and TCRAJ61 elements on chromosome 14; iii) two tetranucleotide simple repeats (D12S66, D12S67), not linked to known genes on chromosome 12; iv) a Y-chromosomal (gata) n polymorphism (DYS19). In general, allele frequencies and heterozygosity rates were similar, but specific alleles were missing in one or more populations. Distinct DYS19 alleles predominated in particular cohorts. Different allele frequencies were observed for the TCR loci in European and Asian populations. Tetranucleotide polymorphisms were distributed normally, whereas TCR alleles displayed bimodal frequency profiles. For TCRBV6S1 and TCRBV6S7, this profile reflects a diallelic protein polymorphism that correlates exactly with the length of the intronic repeats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202830
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Two recurrent nonsense mutations and a 4 bp deletion in a quasi-symmetric element in exon 37 of the NF1 gene (1995)
    Springer
    Human genetics 〈Berlin〉 96 (1995), S. 95-98 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We screened a total of 92 unrelated patients with neurofibromatosis type 1 (NF1) for mutations in exon 37 of the NF1 gene, by using temperature gradient gel electrophoresis. Two novel mutations were found: a 4 bp deletion in a so-called quasi-symmetric element (6789delTTAC) and a recurrent nonsense mutation, which was identified in two unrelated patients, at codon 2264 (C6792A). The independent origin of the latter mutation in two families was confirmed by haplotype analysis. The nonsense mutation and the 4 bp deletion are both predicted to lead to a truncated protein product lacking the Cterminal 20% (aproximately) of its sequence. The occurrence of three independent mutations among 92 NF1 patients at codons 2263–2264 (exon 37) suggests that a specific search for mutations in this area should be undertaken in screening programs for NF1 mutations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00214193
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Maternal investment in rhesus macaques (Macaca mulatta): reproductive costs and consequences of raising sons (2000)
    Springer
    Behavioral ecology and sociobiology 48 (2000), S. 1-11 
    Details
    ISSN: 1432-0762
    Keywords: Key words Macaca mulatta ; Maternal investment ; Sex ratio ; Paternity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Maternal investment in offspring is expected to vary according to offspring sex when the reproductive success of the progeny is a function of differential levels of parental expenditure. We conducted a longitudinal investigation of rhesus macaques to determine whether variation in male progeny production, measured with both DNA fingerprinting and short tandem repeat marker typing, could be traced back to patterns of maternal investment. Males weigh significantly more than females at birth, despite an absence of sex differences in gestation length. Size dimorphism increases during infancy, with maternal rank associated with son’s, but not daughter’s, weight at the end of the period of maternal investment. Son’s, but not daughter’s, weight at 1 year of age is significantly correlated with adult weight, and male, but not female, weight accounts for a portion of the variance in reproductive success. Variance in annual offspring output was three- to fourfold higher in males than in females. We suggest that energetic costs of rearing sons could be buffered by fetal delivery of testosterone to the mother, which is aromatized to estrogen and fosters fat accumulation during gestation. We conclude that maternal investment is only slightly greater in sons than in daughters, with mothers endowing sons with extra resources because son, but not daughter, mass has ramifications for offspring sirehood. However, male reproductive tactics supersede maternal investment patterns as fundamental regulators of male fitness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002650000204
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Power and limits of DNA-profiling in primate populations: Paternity assessment in rhesus macaques from Cayo Santiago (1993)
    Springer
    Primates 34 (1993), S. 395-402 
    Details
    ISSN: 0032-8332
    Keywords: DNA fingerprinting ; Oligonucleotides ; Paternity assessment ; Heterozygosity ; Rhesus monkeys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Paternity testing was performed in one social group (S) of rhesus macaques from Cayo Santiago, Puerto Rico. In 11/15 cases, sires could be identified comparing the multilocus DNA profiles of 19 males to those of the corresponding mother/child dyads. All 19 males could be excluded from paternity in the remaining four cases. Decision making was partly based on likelihoods of DNA profiles, and the theoretical model underlying these calculation is described. In a second social group (M), held in captivity, paternity testing was impeded by a deficit of maternal bands and by an increased extent of band sharing of mothers and their infants. Some possible explanations for these findings, including increased homozygosity in group M, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382635
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    Male rank, reproductive behavior, and reproductive success in free-ranging rhesus macaques (1993)
    Springer
    Primates 34 (1993), S. 481-489 
    Details
    ISSN: 0032-8332
    Keywords: Macaca mulatta ; Cayo Santiago ; DNA fingerprinting ; Paternity ; Mating success ; Dominance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Paternity assessment through DNA fingerprinting by synthetic oligonucleotide probes was applied to one birth cohort in a social group of free-ranging rhesus macaques (Macaca mulatta) on Cayo Santiago. The 11 group males and 9 males from other groups were observed mating with the females. Paternity was determined for 11 of the 15 infants. Male dominance rank was not associated with reproductive success. High-ranking resident males (N=5) sired 27% of the infants born during a one-year study. Four of the 11 infants of known paternity were sired by males of other social groups. The four infants of unknown paternity were sired either by males not observed mating with the females or the low-ranking male who was not fingerprinted. Male dominance rank was not associated with reproductive activity during conception cycles. These results suggest that the effect of rank on male reproductive success is not a predictable correlation, but a conditional probability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382659
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    Synthese chiraler Azobenzole und Untersuchung der in nematischen Flüssigkristallen durch sie induzierten cholesterischen Phasen (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2501-2518 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Chiral Azobenzenes and Investigation of the Cholesteric Phases in Nematic Liquid Crystals Induced by ThemThe chiral cis- and trans-azo compounds 8a-d and 9a-d with para- or ortho-standing chiral side chains as well as the trans-azoxy derivaties 17a-d and 18a-d are synthesized. The influence of the molecular structure and the distance of the chiral centre from the aromatic nucleus on screw sense and pitch of induced cholesteric phases is investigated. The cis-azo compounds 9c and d show atropisomerism.
    Notes: Die chiralen cis- und trans-Azoverbindungen 8a-d und 9a-d mit para bzw. ortho-ständigen chiralen Seitenketten sowie die trans-Azoxyderivate 17a-d und 18a-d werden synthetisiert. Die Asymmetriezentren befinden sich an den C-Atomen 1,2,3 oder 4 der Seitenketten. Der Einfluß sowohl der Molekülgeometrie als auch der Entfernung des chiralen Zentrums vom aromatischen Kern auf den Drehsinn und die Ganghöhe induzierter cholesterischer Phasen wird untersucht. Bei den cis-Azoverbindungen 9c und d treten Atropisomere auf.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140716
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Marker pattern instabilities as a major cause of reproducibility problems in two-dimensional DNA fingerprinting (1996)
    Weinheim : Wiley-Blackwell
    Electrophoresis 17 (1996), S. 659-666 
    Details
    ISSN: 0173-0835
    Keywords: Two-dimensional DNA fingerprinting ; Denaturing gradient gel electrophoresis ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Two-dimensional (2-D) DNA fingerprinting is a promising technique for multilocus analysis of eukaryotic genomes. It has been successfully applied to the detection of DNA variation in tumors, to linkage analyses and to genomic comparisons of inbred mouse strains. However, there are still problems with inter-gel comparisons of 2-D DNA typing patterns as documented by the intergel reproducibility rates reported in the literature, which range from 84 to 98%. The basis for standardization in almost all of these studies has been a set of lambda fragments (digested separately with the restriction enzymes HaeIII, RsaI, Bg/I) that produces a spot pattern scattered across the gel. These spots are used as markers for gel comparisons. Since we noticed considerable variations in the marker spot paterns, we evaluated the properties of the lambda marker using both computer simulation and an empirical analysis of forty independent consecutive gels from our laboratory. We explain the instabilities of the spot pattern on the basis of the melting properties of the individual lambda fragments. A subset of spots is presented that has been stable in all our experiments. Only this set of spots should be used for gel standardization purposes until a new, completely reproducible marker becomes available. Finally, suggestions for an improved marker system are made.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150170406
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    A novel standardization method for two-dimensional DNA fingerprints (1997)
    Weinheim : Wiley-Blackwell
    Electrophoresis 18 (1997), S. 2874-2879 
    Details
    ISSN: 0173-0835
    Keywords: DNA fingerprinting ; Two-dimensional DNA electrophoresis ; Numerical iteration ; Relaxation method ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Two-dimensional (2-D) DNA fingerprinting is a technique that allows for parallel genome analysis through the simultaneous detection of up to 500 minior microsatellite loci on a 2-D gel. Separation is performed according to size and melting temperature in the gel. In the application of this technique in genome analysis, a standardized method for the identification of individual spots is required. However, due to the polymorphic nature of up to 80% of the spots, existing standardization methods that have been primarily developed for 2-D protein patterns are not suitable for this task. We developed a robust method that standardizes 2-D DNA fingerprint spots on the basis of melting temperature - or denaturing gradient position - and fragment size. An external marker was used as a basis for standardization. A normalization surface was calculated over the gel dimensions by adapting an established numerical iteration technique previously used in physics termed “relaxation method”. The relaxation method works robustly with the irregularly spaced marker spots. The evaluation of the method for a spot of preknown position derived from the TP53 gene revealed a median observed error below 1% for fragment length and denaturing gradient position. The search for candidate minisatellite loci in genomic difference analysis depends on the reliable identification of alleles of this locus in different individuals. We proved experimentally that alleles of a single minisatellite locus cloned from a 2-D gel cluster on an isothermal line can be reliably identified using the presented standardization method. In conclusion, a standardization tool for a broader application of 2-D DNA fingerprinting in both tumor analysis and possibly parallel mutation screening is now available.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150181527
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Three novel mutations of the NF1 gene detected by temperature gradient gel electrophoresis of exons 5 and 8 (1996)
    Weinheim : Wiley-Blackwell
    Electrophoresis 17 (1996), S. 1559-1563 
    Details
    ISSN: 0173-0835
    Keywords: Temperature gradient gel electrophoresis ; Denaturing gradient gel electrophoresis ; Neurofibromatosis gene ; Mutation analysis ; Exon skipping ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: We screened a total of 100 unrelated patients with neurofibromatosis type 1 (NF1) for mutations in exons 5 and 8 of the NF1 gene using temperature gradient gel electrophoresis (TGGE). Careful interpretation of exon 5 TGGE patterns was necessary due to interference by an exonic polymorphism. Three novel mutations were identified: a stop mutation in exon 5 (Q239X) caused by a C→T transition at cDNA nucleotide position 715, a transition at the invariant G of the splice accceptor site in intron 4c (G655-1A), and a transversion at the invariant G of the splice donor site in intron 8 (G1185+1T). Analysis of mRNA revealed the predicted abnormal splice products. While skipping of exon 5 causes a shift in the reading frame with a premature stop codon downstream in the middle of exon 6, skipping of exon 8 leads to an in-frame deletion with the predicted protein product being shortened by 41 amino acids.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150171011
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...