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  • 1
    Electronic Resource
    Electronic Resource
    X-ray structural studies of cis-Mo(CO)4(PR3)2 (R = Me, Et, n-Bu) derivatives and their relationship to solution isomerization processes in these octahedral species (1982)
    s.l. : American Chemical Society
    Inorganic chemistry 21 (1982), S. 2661-2666 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00137a026
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  • 2
    Electronic Resource
    Electronic Resource
    Complexity aspects of guessing prefix codes (1994)
    Springer
    Algorithmica 12 (1994), S. 409-419 
    Details
    ISSN: 1432-0541
    Keywords: Prefix codes ; Huffman codes ; Encryption ; Complexity ; NP-completeness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract Given a natural language cleartext and a ciphertext obtained by Huffman coding, the problem of guessing the code is shown to be NP-complete for various variants of the encoding process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185434
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  • 3
    Electronic Resource
    Electronic Resource
    An alternatively spliced Interleukin 4 form in lymphoid cells (1995)
    Springer
    Immunogenetics 41 (1995), S. 57-57 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188440
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  • 4
    Electronic Resource
    Electronic Resource
    Activity of O6-methylguanine DNA methyltransferase in mononuclear blood cells of formaldehyde-exposed medical students (1999)
    Springer
    Archives of toxicology 73 (1999), S. 15-21 
    Details
    ISSN: 1432-0738
    Keywords: Key words O6-methylguanine DNA methyltransferase (MGMT) ; Formaldehyde ; Mononuclear blood cells ; DNA repair
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A recent study reported that exposure of student embalmers in Cincinnati to high concentrations of formaldehyde (2 mg/m3) reduced the activity of the DNA repair protein O6-methylguanine DNA methyltransferase (MGMT). Reduction in a DNA repair enzyme may strongly increase the cancer risk not only with respect to the repair-enzyme causing agent but with respect to all carcinogens causing lesions subject to repair by the enzyme in question. Thus, we examined whether formaldehyde exposure of 57 medical students during their anatomy course at two different Universities in Germany influenced MGMT activity in mononuclear blood cells. Mean formaldehyde exposure of 41 students was 0.2 ± 0.05 mg/m3 for 6 h per week. MGMT activity was 133.2 ± 14.9 fmol MGMT/106 cells before the beginning of the formaldehyde exposure, 131.1 ± 15.8 fmol MGMT/106 cells after 50 days (P = 0.56) and 128.2 ± 19.0 fmol MGMT/106 cells after 111 days of exposure (P=0.92). Similarly, no significant influence of formaldehyde exposure was observed, when smoking habits, alcohol consumption, allergic disease and sex of students were considered. In addition no significant difference was obtained in MGMT activity between 16 students with mean formaldehyde exposure of 0.8 ± 0.6 mg/m3 and students without formaldehyde exposure (n=51; P=0.37). In conclusion, exposure of the medical students in western Europe to formaldehyde did not decrease MGMT activity in mononuclear blood cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002040050581
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  • 5
    Electronic Resource
    Electronic Resource
    Use of oligonucleotides containing ethenoadenine to study the repair of this DNA lesion Determination of individual and collective repair activities (1994)
    Springer
    Archives of toxicology 68 (1994), S. 358-363 
    Details
    ISSN: 1432-0738
    Keywords: Key words: Ethenoadenine – Nicking activity – Peripheral mononuclear blood cells – Repair capacities – Vinyl chloride-exposed workers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Oligonucleotide duplexes of a defined sequence containing one 1,N 6-ethenoadenosine (EA) were synthesized and used as substrates to study the repair of this DNA lesion in cell homogenates of peripheral mononuclear blood cells of 39 male and female workers, exposed to vinyl chloride. These data were compared to data from 39 employees of the same company working in other production plants and to data from a control group of 39 persons, living in an area without vinyl chloride production. After incubation of the 5′- and 3′-labeled oligonucleotide duplex with cell homogenate, a specific nicking activity, releasing the deoxyribosyl phosphate originally carrying the EA, was found. This activity was used to determine the individual and collective repair activities for ethenoadenine. The exposed group showed a mean of 158.5±39.9 (SD) fmol product fragment and did not differ significantly from the mean value of the two control groups with 156.5±42.9 fmol and 161.2±53.6 fmol, respectively. Large interindividual variations were found, ranging from 4.9-fold in the exposed to 8.2- and 7.2-fold in the control groups. The development of an assay for ethenoadenine repair is significant for understanding the role of EA repair in eukaryotic cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002040050082
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  • 6
    Electronic Resource
    Electronic Resource
    Nonlinear kernels of the human ERG (1979)
    Springer
    Biological cybernetics 35 (1979), S. 145-160 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract In this paper we examine the use of a symmetric binary random stimulus for eliciting the ERG, and for calculating the first-order and second-order kernels of a nonlinear functional expansion of the response. We show that if the stimulus is represented in a non-dimensional form, then the units in which all kernels are measured are the same as the units used to measure the response, microvolts in the case of the ERG: further, contributions from all kernels to the response can be added without scale factors. We present the first-order and second-order kernels measured for a population of 15 normal subjects in a clinical setting. The measurements were made at various levels of adaptation ranging from photopic to scotopic conditions. The second-order kernels illustrate the processes of rapid adaptation (〈100 ms) in the retina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337060
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  • 7
    Electronic Resource
    Electronic Resource
    Transethmoidal drainage and arrest of craniopharyngioma by Zenker's solution (1968)
    Springer
    Acta neurochirurgica 17 (1968), S. 196-204 
    Details
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bericht über einen Fall mit rezidivierender intrasellärer Kraniopharyngeomzyste bei einem Erwachsenen, bei dem durch transethmoidale stereotaktische Instillation vonZenkerscher Lösung für bisher 7 Jahre das Auftreten weiterer Rezidive verhindert werden konnte.
    Abstract: Résumé On présente le compte-rendu d'un cas d'une rémission de sept ans d'un kyste crânio-pharygiome intra-sellaire récurrent chez un adulte, effectué par l'instillation de la solution deZenker dans la cavité du kyste au moyen d'une voie extracrânienne transethmoïdal établie sous controle stéréotactique.
    Notes: Summary A case report is presented of a seven year arrest of a recurring intrasellar craniopharyngioma cyst in an adult, accomplished by instillation ofZenkera's sulution into the cyst cavity by means of an extracranial transethmoidal route established under stereotactic control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01402538
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetische Struktur von Mn(Nb0,5Ta0,5)2O6, Manganotantalit (1976)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 32 (1976), S. 587-591 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The magnetic structure of Mn(Nb0.5Ta0.5)2O6 with columbite structure was determined by means of neutron diffraction using single-crystal data. The intensities were gained by means of a small cold Eulerian cradle. The evaluation leads to a canted magnetic structure GxAz (G: S1 = - S2 = S3 = - S4; A: S1 = - S2 = - S3 = S4). The magnetic moments form an angle of 35.4° with the a axis. The magnetic space group is Pb'cn. The canting angle depends on the Nb content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739476001253
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetische Struktur des Trirutils FeTa2O6 (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 380-384 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: By means of neutron diffraction the magnetic structure of FeTa2O6 has been determined. The observed magnetic reflexions define a unit cell 2a, b, 2c. In order to match the tetragonal symmetry this cell must be enlarged again, which results in the final magnetic cell 2a, 2b, 2c with the magnetic space group Ic41/a. The structure contains two sublattices with the cells 2a, b, 2c and a, 2b, 2c, the moments of which are perpendicular to each other. The moments lie in the a/b plane and form an angle of φ = 45° with the a axis. The spin quantum number is found to be S = 2.04.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739474000866
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  • 10
    Electronic Resource
    Electronic Resource
    The nickel released from jewelry in Israel and its clinical relevance (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 39 (1998), S. 0 
    Details
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0536.1998.tb05896.x
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