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  • 1
    Electronic Resource
    Electronic Resource
    Extractable chromium determination in soils by AAS (1995)
    Springer
    Microchimica acta 119 (1995), S. 251-258 
    Details
    ISSN: 1436-5073
    Keywords: extractable chromium ; soils ; EDTA extracts ; acetic acid extracts ; FAAS ; releasing agent oxine and ETAAS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The lixiviation of trace metals from soils using selective extractants gives valuable information, especially for agricultural purposes. The two reagents validated by a group of European researchers coordinated by the Measurements and Testing Program (MAT) of the Commission of the European Community, in single extraction procedures, are EDTA 0.05 moll−1 and CH3COOH 0.43 moll−1. This paper reports the effect of these extractants upon chromium determination in extracts by AAS. Matrix effects were studied in extracts of two soils of different origin: a terra rossa soil from a Mediterranean area and a sewage amended soil. For the FAAS technique, the matrix effects were studied for air-acetylene and nitrous oxide-acetylene flames and using Cr(VI) and Cr(III) as standard solutions. The interfering effects observed are circumvented by the use of 1% 8-hydroxyquinoline as suppressor agent. For the ETAAS technique, charring and atomization curves were obtained for extracts in each reagent and after setting up the graphite furnace program, matrix effects were studied. Different matrix modifiers (Mg(NO3)2, Pd and Triton X-100) were also tested. Once the analytical method had been established, single extraction procedures were applied in the two soils, determining the percentage of extractable chromium in relation to the total content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244004
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of candidate certified reference materials for the quality control of EDTA-and acetic acid-extractable trace metal determinations in sewage sludge-amended soil and terra rossa soil (1995)
    Springer
    Microchimica acta 120 (1995), S. 289-300 
    Details
    ISSN: 1436-5073
    Keywords: extraction ; soils ; trace elements ; candidate CRMs ; reference materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The determination of extractable trace metal contents in soil using single extraction procedures is currently performed in many laboratories to assess the bioavailable metal fraction (and related phytotoxic effects) and the accessability to the environment (e.g. contamination of ground waters). Owing to the need for validation of the extraction schemes used and of the analytical techniques, the EC Measurements and Testing Programme (formerly BCR) has organized a project for improving the quality of determination of extractable trace metal contents in soil, the first step being an interlaboratory study to adopt common extraction procedures and the second being a certification campaign to certify two soils for their extractable trace element contents following these procedures. This paper gives a brief overview of the project organisation and describes the preparation, homogeneity and stability studies of two soil candidate reference materials (sewage sludge-amended and terra rossa soils).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244439
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  • 3
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    Neurotrophins and excitotoxicity (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-12-22
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fernandez-Sanchez, M T -- Novelli, A -- New York, N.Y. -- Science. 1995 Dec 22;270(5244):2019.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8533100" target="_blank"〉PubMed〈/a〉
    Keywords: Brain-Derived Neurotrophic Factor ; Cell Death/drug effects ; Cells, Cultured ; Cerebellum/cytology/drug effects ; Glutamic Acid/*toxicity ; Nerve Growth Factors/*pharmacology ; Nerve Tissue Proteins/*pharmacology ; Neurons/cytology/*drug effects ; Neurotrophin 3 ; Receptors, N-Methyl-D-Aspartate/physiology
    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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  • 4
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    A p53-dependent mouse spindle checkpoint (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-03-03
    Description: Cell cycle checkpoints enhance genetic fidelity by causing arrest at specific stages of the cell cycle when previous events have not been completed. The tumor suppressor p53 has been implicated in a G1 checkpoint. To investigate whether p53 also participates in a mitotic checkpoint, cultured fibroblasts from p53-deficient mouse embryos were exposed to spindle inhibitors. The fibroblasts underwent multiple rounds of DNA synthesis without completing chromosome segregation, thus forming tetraploid and octaploid cells. Deficiency of p53 was also associated with the development of tetraploidy in vivo. These results suggest that murine p53 is a component of a spindle checkpoint that ensures the maintenance of diploidy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cross, S M -- Sanchez, C A -- Morgan, C A -- Schimke, M K -- Ramel, S -- Idzerda, R L -- Raskind, W H -- Reid, B J -- R01CA55814/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1995 Mar 3;267(5202):1353-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, University of Washington, Seattle 98195.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7871434" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Cycle ; Cells, Cultured ; DNA/biosynthesis ; Demecolcine/pharmacology ; Diploidy ; Female ; Genes, p53 ; Male ; Mice ; *Mitosis ; Nocodazole/pharmacology ; Ploidies ; Spindle Apparatus/*physiology ; Tumor Suppressor Protein p53/*physiology
    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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