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  • 1995-1999  (26)
  • 1985-1989  (3)
  • 1945-1949
  • 1999  (26)
  • 1988  (3)
  • 11
    Digitale Medien
    Digitale Medien
    Reaction characteristics of cellulose in the LiCl/1,3‐dimethyl‐2‐imidazolidinone solvent system (1999)
    Springer
    Cellulose 6 (1999), S. 93-102 
    Details
    ISSN: 1572-882X
    Schlagwort(e): LiCl/1 ; 3‐dimethy‐2‐imidazolidinone solvent system ; homogeneous cellulose solution ; cellulose acetate ; O‐methylcellulose ; reaction characteristics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Abstract In order to elucidate the nature of the LiCl/1,3‐dimethy‐2‐imidazolidinone (DMI) solvent system as one of the homogeneous reaction media of cellulose, cellulose acetate (CA) and O‐methylcellulose (MC) were prepared using this solvent system, and the distribution of substituents within anhydroglucose units was examined by 13C‐NMR. It was found that (i) homogeneous cellulose solutions can be easily prepared by heating 2, 5–12 and 100 parts of weight of cellulose, LiCl, and DMI, respectively, and (ii) the relative reactivity of hydroxyl groups is in the order C‐6 〉 C‐2 〉 C‐3 for both CA and MC. A remarkable feature of this solvent system is that the reaction efficiency in etherification is very high compared with other homogeneous solvent systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009208417954
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  • 12
    Digitale Medien
    Digitale Medien
    KrF excimer laser ablation of thin Cr film on glass substrate (1999)
    Springer
    Applied physics 68 (1999), S. 417-423 
    Details
    ISSN: 1432-0630
    Schlagwort(e): PACS: 42.62.-b; 42.55.Lt; 42.30.Va
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003390050916
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  • 13
    Digitale Medien
    Digitale Medien
    Identification of a new class of steroid hormone receptors (1988)
    [s.l.] : Nature Publishing Group
    Nature 331 (1988), S. 91-94 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] One approach to search for unrecognized hormone response systems is to systematically employ reduced stringency hybridiz-ation to screen recombinant DNA libraries for novel hormone receptors. The DNA-binding domain of the oestrogen receptor was used as hybridization probe in analysis of a AgtlO ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/331091a0
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  • 14
    Digitale Medien
    Digitale Medien
    MRI of primary meningeal tumours in children (1999)
    Springer
    Neuroradiology 41 (1999), S. 512-516 
    Details
    ISSN: 1432-1920
    Schlagwort(e): Key words Meninges ; Tumours ; Children
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Childhood meningeal tumours are uncommon and mostly meningiomas. We reviewed the histological and radiological findings in meningeal tumours in six children aged 12 years or less (four benign meningiomas, one malignant meningioma and one haemangiopericytoma). Compared to the adult counterpart, childhood meningiomas showed atypical features: cysts, haemorrhage, aggressiveness and unusual location. MRI features varied according to the site of the tumour, histology, haemorrhage, and presence of intra- or peritumoral cysts. Diagnosis of the extra-axial tumour was relatively easy in two patients with meningiomas, one malignant meningioma and one haemangiopericytoma. MRI findings strongly suggested an intra-axial tumour in two patients with benign meningiomas, because of severe adjacent edema. Awareness of the variable findings of childhood meningiomas and similar tumours may help in differentiation from brain tumours.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002340050794
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  • 15
    Digitale Medien
    Digitale Medien
    Characterization of two fungal-elicitor-induced rice cDNAs encoding functional homologues of the rab-specific GDP-dissociation inhibitor (1999)
    Springer
    Planta 210 (1999), S. 143-149 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Key words: Differential display ; Functional analysis ; Fungal elicitor treatment ; Oryza (rab-GDIs) ; Pathogen signaling ; Rab-specific GDP dissociation inhibitor
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract. By using the mRNA differential display approach to isolate defense signaling genes active at the early stage of fungal infection two cDNA fragments with high sequence homology to rab-specific GDP-dissociation inhibitors (GDIs) were identified in rice (Oryza sativa L.) suspension cells. Using polymerase-chain-reaction products as probes, two full-length cDNA clones were isolated from a cDNA library of fungal-elicitor-treated rice, and designated as OsGDI1 and OsGDI2. The deduced amino acid sequences of the isolated cDNAs exhibited substantial homology to Arabidopsis rab-GDIs. Northern analysis revealed that transcripts detected with the 3′-gene-specific DNA probes accumulated to high levels within 30 min after treatment with a fungal elicitor derived from Magnaporthe grisea. The functionality of the OsGDIs was demonstrated by their ability to rescue the Sec19 mutant of Saccharomyces cerevisiae which is defective in vesicle transport. The proteins, expressed in Escherchia coli, cross-reacted with a polyclonal antibody prepared against bovine rab-GDI. Like bovine rab-GDI, the OsGDI proteins efficiently dissociated rab3A from bovine synaptic membranes. Using the two-hybrid system, it was shown that the OsGDIs specifically interact with the small GTP-binding proteins belonging to the rab subfamily. The specific interaction was also demonstrated in vitro by glutathione S-transferase resin pull-down assay.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004250050663
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  • 16
    Digitale Medien
    Digitale Medien
    Effect of interferon on Vero cells persistently infected with Sendai virus compared to Vero cells persistently infected with SSPE virus (1988)
    Springer
    Archives of virology 98 (1988), S. 235-251 
    Details
    ISSN: 1432-8798
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Persistent infections with Sendai and SSPE virus were established in Vero cells. Sequential passages of these cells were monitored by immunofluorescence and for their sensitivity to the antiviral and antiproliferative effects of interferon (IFN). The cells rapidly developed resistance to the antiviral effect of IFN as judged by the inability of IFN to inhibit the replication of exogenous Sindbis virus. This decrease was accompanied by a reduction in the induction of the 2′–5′ oligo A synthetase. Both cell lines were resistant to the antiproliferative effect of IFN. A decrease or absence of IFN receptors on the surface of the cells was not found to be the cause of their resistance to IFN.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01322172
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  • 17
    Digitale Medien
    Digitale Medien
    Variations in meniscofemoral ligaments at anatomical study and MR imaging (1999)
    Springer
    Skeletal radiology 28 (1999), S. 189-195 
    Details
    ISSN: 1432-2161
    Schlagwort(e): Key words Knee ; anatomy ; Knee ; MR ; Knee ; ligaments ; menisci ; and cartilage
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Purpose To demonstrate variations in the meniscofemoral ligaments (ligaments of Wrisberg and Humphrey) at anatomical study and magnetic resonance (MR) imaging. Design Twenty-eight cadaveric knees were partially dissected for the examination of the meniscofemoral ligaments. One hundred knee MR examinations were reviewed by two experienced musculoskeletal radiologists. Proximal variations in the meniscofemoral ligaments at MR imaging were classified into three types according to the attachment site: type I, medial femoral condyle; type II, proximal half of the posterior cruciate ligament (PCL); type III, distal half of the PCL. Distal variations were classified into vertical or oblique types according to the orientation of the intermediate signal at the interface of the ligament and lateral meniscus. Results At anatomical study, six cases showed variations in the proximal insertion site of the meniscofemoral ligaments. At MR imaging 93 cases had one or more meniscofemoral ligaments, giving a total of 107 ligaments: 90 ligaments of Wrisberg and 17 ligaments of Humphrey. Forty-one ligaments of Wrisberg were type I, 28 type II, 19 type III, and with two indeterminate type, while 6 ligaments of Humphrey were type I and the remaining 11 were indeterminate. Seven cases showed no meniscofemoral ligament. Of the 107 meniscofemoral ligaments, the distal insertion orientation was of vertical type in 10 ligaments, oblique type in 70 and unidentified in 27. Conclusion An understanding of the high incidence of meniscofemoral ligament variations may help in the interpretation of knee MR studies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002560050499
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  • 18
    Digitale Medien
    Digitale Medien
    Studies of the type I cellular retinoic acid-binding protein mutants and their biological activities (1999)
    Springer
    Molecular and cellular biochemistry 200 (1999), S. 69-76 
    Details
    ISSN: 1573-4919
    Schlagwort(e): CRABP-I ; RA induction ; RA binding ; mutagenesis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Notizen: Abstract We have mutated the type I cellular retinoic acid binding protein (CRABP-I), individually at the Arg131 (into Ala) and the Tyr 133 (into Phe) residues which have been predicted to make direct contact with retinoic acid (RA) based upon previous structural studies. The RA-binding affinities of these mutants are examined and their biological effects on RA induction of reporter genes are determined. The R131A mutation drastically affects its ligand-binding property, but the Y133F mutation has little effect. By using an RA-inducible reporter, it is found that the wild type CRABP-I exerts biphasic effects on RA induction of the reporter. The early (at 12 h) effect is to enhance RA induction, whereas the delayed (at 24 h) effect is to suppress RA induction. In consistence with their RA binding property, the R 131A mutant loses both its early and delayed biological activities, whereas the Y133F mutant remains as effective as the wild type. It is concluded that CRABP-I over-expression exerts biphasic effects on RA-mediated gene expression, and that Arg131, but not Tyr 133, is essential for a high RA-binding affinity of this protein as well as its biological activity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006906415388
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  • 19
    Digitale Medien
    Digitale Medien
    Axisymmetric compressible boundary layer on a long thin moving cylinder (1999)
    Springer
    Acta mechanica 138 (1999), S. 255-260 
    Details
    ISSN: 1619-6937
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Summary The steady laminar boundary layer flow on a thin and isothermal moving cylinder in a viscous compressible fluid at rest is studied in this paper. The fluid considered is a model fluid in which ϱ∼T −1 and μ∼T ω. The transformed non-similar boundary layer equations are solved numerically using a very efficient numerical method for some values of ω and wall enthalpyg ω parameters. The skin friction coefficient and Nusselt number are calculated for Pr=0.7 and some values of ω andg ω
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01291848
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  • 20
    Digitale Medien
    Digitale Medien
    Generalized Kirchhoff-Love assumptions for thick shells: Application to thermal stresses in rectilinear tubes (1988)
    Springer
    Acta mechanica 74 (1988), S. 95-106 
    Details
    ISSN: 1619-6937
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Summary Asymptotic expansions of displacements in powers of a small parameter related to the shell thickness are re-derived with a view to investigating the way in which the leading terms depend on the thickness coordinate. The outcome of this preliminary study gives a hint concerning possible kinematic assumptions to be used as starting points for constructing thick shell theories. Then the problem of reducing the number of independent generalized displacements by enforcing all or part of the traction boundary conditions on the shell outer and inner surfaces is studied. Several thick shell theories are proposed and compared; the superiority of a certain generalized Kirchhoff-Love assumption is brought out in the particular case of circular cylindrical shells subjected to several types of thermal loadings.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01194344
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