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  • 1
    Electronic Resource
    Electronic Resource
    Identification of a new neutron rich isotope202Pt (1992)
    Springer
    The European physical journal 342 (1992), S. 369-370 
    Details
    ISSN: 1434-601X
    Keywords: 27.80.+W ; 23.40.−S
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The unreported platinum isotope,202Pt, has been identified for the first time byγ-ray measurement of chemically separated activities. The reaction204Hg(n, 2pn)202Pt was used to produce202Pt activity. The half-life of202Pt has been determined to be 43.6±15.2h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291520
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chemical separation for identification of new isotope202Pt (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 175 (1993), S. 207-217 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A separation procedure of trace platinum from large amounts of mercury and other interfering elements is described. After irradiation, the HgO target was dissolved in concentrated HCl solution. The thallium fraction was removed by solvent extraction with ether. In the aqueous phase after extraction the radioisotope of platinum produced by irradiation was precipitated as (NH4)2PtCl6 by adding a saturated solution of NH4Cl in the presence of H2PtCl6·6H2O as stable carrier. The decontamination factor of mercury, gold and thallium and the recovery of platinum in the process of separation are satisfactory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02163346
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    EXAFS and FTIR studies on the binding of deoxycholic acid with copper and zinc ions (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 1 (1995), S. 291-296 
    Details
    ISSN: 1075-4261
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Deoxycholic acid is an important physiological bile acid. The binding of bile salts with metal ions has received more attention due to its clinical significance. In this study, a series of copper and zinc deoxycholate complexes were synthesized. EXAFS and FTIR spectroscopic techniques were used for characterization. The results indicated that both the carboxyl and hydroxyl groups of deoxycholic acid are binding to the Cu (or Zn) ion to form a new complex. There are six oxygen atoms surrounding the metal ion with the average bond lengths of Cu-O and Zn-O are 1.95 and 2.06 Å respectively. © 1995 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bspy.350010407
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  • 4
    Electronic Resource
    Electronic Resource
    Periodic and chaotic precipitation phenomena in bile salt system related to gallstone formation (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 3 (1997), S. 195-205 
    Details
    ISSN: 1075-4261
    Keywords: cholelithiasis ; gallstone ; bile salts ; periodic precipitation ; fractal precipitation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: This is the first observation that both chaotic and periodic patterns are formed in metal ions-deoxycholate-gel systems. It is an in vitro model for approximating the conditions present during gallstone formation. The experimental results suggest that a nonlinear scientific concept such as the “butterfly effect” should be considered in understanding gallstone formation. This effect suggests that a butterfly flapping its wings in Beijing today may lead to a thunderstorm in New York months later. Applying this concept to biology, minor changes in the local chemical environment within biological systems may lead to large variations in the structure and morphology of gallstone through changes in the behavior of biological mineralization process. © 1997 John Wiley & Sons, Inc. Biospect 3: 195-205, 1997
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 5
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    Nitrate Reduction Mechanisms and Rates in an Unconfined Eogenetic Karst Aquifer in Two Sites with Different Redox Potential. (2017)
    Wiley-Blackwell
    Details
    Publication Date: 2017-04-11
    Description: This study integrates push-pull tracer tests (PPTT) with microbial characterization of extracted water via quantitative polymerase chain reaction (qPCR) and reverse transcriptase qPCR (RT-qPCR) of selected functional N transformation genes to quantify nitrate reduction mechanisms and rates in sites with different redox potential in a karst aquifer. PPTT treatments with nitrate (AN) and nitrate-fumarate (ANC) were executed in two wells representing anoxic and oxic geochemical end members. Oxic aquifer zero order nitrate loss rates (mmol L -1 hr -1 ) were similar for AN and ANC treatment, ranging from 0.03 ± 0.01 to 0.05 ± 0.01. Anoxic aquifer zero order nitrate loss rates ranged from 0.03 ± 0.02 (AN) to 0.13 ± 0.02 (ANC). Microbial characterization indicates mechanisms influencing these rates were dissimilatory nitrate reduction to ammonium (DNRA) at the anoxic site with AN treatment, assimilatory reduction of nitrate to ammonium (ANRA) with ANC treatment in the water column at both sites, and additional documented nitrate reduction that occurred in unsampled biofilms. With carbon treatment, total numbers of microbes (16S rRNA genes) significantly increased (14-30 fold), supporting stimulated growth with resulting ANRA. Decreased DNRA gene concentrations ( nrfA DNA) and increased DNRA activity ratio (nrfA-cDNA/DNA) supported the assertion that DNRA occurred in the anoxic zone with AN and ANC treatment. Furthermore decreased DNRA gene copy numbers at the anoxic site with ANC treatment suggests DNRA microbes in the anoxic site are chemolithoautotrophic. Increased RT-qPCR denitrification gene expression ( nirK and nirS ) was not observed in water samples, supporting that any observed NO 3 -N loss due to denitrification may be occurring in unsampled microbial biofilms.
    Print ISSN: 0148-0227
    Topics: Biology , Geosciences
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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