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  • Spektrometrie, Atomabsorption  (2)
  • *Signal Transduction  (1)
  • 2005-2009  (1)
  • 1980-1984  (2)
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  • 2005-2009  (1)
  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    DithiophosphorsÄure-O,O-diethylester zur Spurenanreicherung an Aktivkohle (1982)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 310 (1982), S. 230-233 
    Details
    ISSN: 1618-2650
    Keywords: Analyse von Eisen, Chrom, Mangan ; Spektrometrie, Atomabsorption ; Spuren in Reinstmetallen ; Anreicherung an Aktivkohle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Aus den Reinstmetallen Eisen, Chrom und Mangan können die Elementspuren Bi, Cd, Cu, In, Pb und Tl durch Sorption ihrer DithiophosphorsÄure-O,O-diethylester-Komplexe an Aktivkohle als SpurenfÄnger abgetrennt werden. Die Trennfaktoren betragen in AbhÄngigkeit vom Matrixelement und von der Probeeinwaage 4×103 bis 5×104. Bei der Bestimmung der Spuren mit der Flammen-AAS werden für alle abgetrennten Elemente Nachweisgrenzen unterhalb 1 Μg/g erreicht.
    Notes: Summary Traces of Bi, Cd, Cu, In and Tl can be separated from high-purity iron, chromium and manganese by sorption of their dithiophosphoric-acid-O,O-diethylester complexes onto activated carbon as trace collector. The factor of separation is 4×103 to 5×104 depending on matrix element and sample weight. The detection limits for the determination of the traces by flame-AAS are lower than 1 Μg/g for all separated elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484037
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dithiophosphorsäure-O,O-diethylester zur Spurenanreicherung an Aktivkohle (1981)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 308 (1981), S. 104-111 
    Details
    ISSN: 1618-2650
    Keywords: Analyse von Gallium, Aluminium ; Spektrometrie, Atomabsorption ; Spuren in Reinstmetallen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der für die Extraktion im stark sauren Medium geeignete Chelatbildner Dithiophosphorsäure-O,O-diethylester kann auch für die Spurensorption an Aktivkohle eingesetzt werden. Durch das unterschiedliche Sorptionsverhalten der Elemente ist es möglich, eine Gruppe von Elementspuren (Bi, Cd, Cu, In, Pb, Tl) selektiv aus verschiedenen Matrices abzutrennen. Am Beispiel der Analyse von Reinstgallium konnte gezeigt werden, daß die Kombination von Spurenabtrennung und mikrophysikalischem Bestimmungsschritt zu Nachweisgrenzen im ng/g-Bereich führt. Als Bestimmungsverfahren für die angereicherten Spuren wurden die Injektionsmethode der Flammen-AAS und die Schlaufen-AAS eingesetzt, da mit beiden Methoden bei sequentieller Messung noch Multielementbestimmungen aus Spurenkonzentraten von weniger als 1 ml möglich sind.
    Notes: Summary The chelate complexing agent dithiophosphoric acid-O,O-diethylester, suitable for extraction from high acidity media, can also be put to use in trace sorption on activated carbon. Due to different sorption behaviour of elements, it is possible to separate selectively from different matrices, groups of elements (such as Bi, Cd, Cu, In, Pb, Tl). By way of example concerning the analysis of high-purity gallium, it could be demonstrated that by combination of a trace separation with a micro-physical determination step, detection limits in the ng/g-region could be reached. As a determination procedure regarding pre-concentrated traces, the injection method of flame-AAS and loop-AAS were applied, because both these methods allow sequential multielement determinations from trace concentrates of less than 1 ml.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00469436
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  • 3
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    Wilms tumor suppressor WTX negatively regulates WNT/beta-catenin signaling (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-05-19
    Description: Aberrant WNT signal transduction is involved in many diseases. In colorectal cancer and melanoma, mutational disruption of proteins involved in the degradation of beta-catenin, the key effector of the WNT signaling pathway, results in stabilization of beta-catenin and, in turn, activation of transcription. We have used tandem-affinity protein purification and mass spectrometry to define the protein interaction network of the beta-catenin destruction complex. This assay revealed that WTX, a protein encoded by a gene mutated in Wilms tumors, forms a complex with beta-catenin, AXIN1, beta-TrCP2 (beta-transducin repeat-containing protein 2), and APC (adenomatous polyposis coli). Functional analyses in cultured cells, Xenopus, and zebrafish demonstrate that WTX promotes beta-catenin ubiquitination and degradation, which antagonize WNT/beta-catenin signaling. These data provide a possible mechanistic explanation for the tumor suppressor activity of WTX.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Major, Michael B -- Camp, Nathan D -- Berndt, Jason D -- Yi, Xianhua -- Goldenberg, Seth J -- Hubbert, Charlotte -- Biechele, Travis L -- Gingras, Anne-Claude -- Zheng, Ning -- Maccoss, Michael J -- Angers, Stephane -- Moon, Randall T -- New York, N.Y. -- Science. 2007 May 18;316(5827):1043-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of Washington School of Medicine, Box 357370, Seattle, WA 98195, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17510365" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing ; Adenomatous Polyposis Coli Protein/metabolism ; Animals ; Axin Protein ; Cell Line ; Cell Line, Tumor ; Cell Nucleus/metabolism ; Cytoplasm/metabolism ; Genes, Wilms Tumor ; Humans ; Kidney Neoplasms/genetics ; Protein Binding ; Protein Interaction Mapping ; Proteomics ; RNA Interference ; Recombinant Fusion Proteins/metabolism ; Repressor Proteins/metabolism ; *Signal Transduction ; Transduction, Genetic ; Tumor Suppressor Proteins/chemistry/genetics/*metabolism ; Ubiquitin/metabolism ; Ubiquitin-Protein Ligases/metabolism ; Wilms Tumor/genetics ; Wnt Proteins/*metabolism ; Xenopus Proteins ; Zebrafish ; beta Catenin/*metabolism ; beta-Transducin Repeat-Containing Proteins/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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