Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1995-1999  (4)
  • 1980-1984
  • 1965-1969
  • 1998  (2)
  • 1995  (2)
Material
Years
  • 1995-1999  (4)
  • 1980-1984
  • 1965-1969
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of environmental contamination and toxicology 35 (1998), S. 302-308 
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. For nearly 50 years, the fingernail clam (Musculium transversum) was believed to be virtually eliminated from the Illinois River. In 1991, workers began finding substantial populations of M. transversum in the Illinois River including several beds in and around the highly polluted Chicago Sanitary District. In order to determine if populations of M. transversum from polluted sites exhibited any genetic response to the high levels of toxins and to examine the genetic structure of several populations of M. transversum for any changes due to the population crash, starch-gel electrophoresis was performed on M. transversum from three Illinois River localities and four Mississippi River basin locations. The sampled populations produced an inbreeding coefficient (FIS) of 0.929, indicating that the populations were highly inbred. The results of a suspected founder effect due to a bottleneck was suggested by an FST= 0.442. The isozyme Glucose-6-phosphate isomerase-2 (Gpi-2) produced allelic frequency patterns that were consistent with expected patterns of a pollution-tolerant allele. Polluted sites exhibited elevated frequencies of Gpi-2 100 whereas nonpolluted sites exhibited elevated frequencies of Gpi-2 74 . This frequency pattern suggested that natural selection was occurring in populations under severe toxic pressures, leading to an increase in the frequency of the allele Gpi-2 100 . Therefore, Gpi-2 100 is a possible pollution-tolerant mutation in M. transversum.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1434-601X
    Keywords: 25.70-z ; 24.30.Cz ; 25.70.Lm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract γ-rays are measured in coincidence with the dissipative complex fragments from the35Cl +64Ni reaction at 7.7 A MeV. Theoretical γ-ray coincidence spectra are determined through a fitting procedure using the contribution of the excited fragment statistical γ-decay calculated by means of the CASCADE code. Whereas the expected statistical spectra fit very well the data in the energy regionE ν=2 to 8 MeV, above this energy another emission mechanism in addition to the statistical decay has to be considered in order to reproduce the experimental spectra. Simulations based on the Vlasov equation suggest that this emission could come from the decay of dipole strength excited in the intermediate dinuclear system.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1434-601X
    Keywords: PACS:26.20.+f Hydrostatic stellar nucleosynthesis – 25.60.Dz Interaction and reaction cross sections
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The loss of 8Li recoil nuclei in 7Li(d,p)8Li has been measured using different backings and 7LiF target thicknesses as well as different deuteron energies. The results confirm essentially recent TRIM calculations. The losses are large (about 13%) for the combination of thin targets and heavy backings at E d=0.80 MeV and increase with decreasing deuteron energy. The implications on the cross sections for 7Li(d,p)8Li and 7Be(p,γ)8B are discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei asymptomatischen, anti-HCV positiven Personen mit andauernd normalen oder leicht (das heißt ≤1,5 fach über der oberen Normgrenze) liegenden Serum ALT-Spiegeln wurden die HCV-RNA im Serum, Leberhistologie und das RIBA-II-Muster untersucht. Bei 22 asymptomatischen, anti-HCV positiven Personen (11 Männern und 11 Frauen im mittleren Alter von 40; Bereich 21–70 Jahren) wurde eine Leberbiopsie durchgeführt und HCV-RNA im Serum bestimmt. Der Nachweis von anti-HCV wurde mit ELISA-2 und RIBA-II-Tests geführt. Die HCV-RNA im Serum wurde mittels PCR bestimmt. Unsere Untersuchungen zeigten, 1.) daß 9/22 asymptomatischen, anti-HCV-positiven Personen histologische Zeichen einer chronischen Lebererkrankung mit fortbestehender HCV-Infektion hatten. 2.) Vier Personen hatten keine histologischen Zeichen einer chronischen Hepatitis und normale Serum-ALT-Spiegel trotz Nachweises von HCV-RNA im Serum. 3.) Die ALT-Spiegel im Serum unterschieden HCV-RNA positive Personen mit chronischer Hepatitis nicht von denjenigen ohne chronische Hepatitis. 4.) Bei anti-HCV positiven Personen mit normalen ALT-Spiegeln ist ein positiver RIBA-II Test nicht immer mit einer HCV-Virämie oder einer chronischen Hepatitis assoziiert. Bei unklarem RIBA-II-Muster bestanden häufig unspezifische Leberveränderungen oder ein normaler histologischer Befund. „Wirklich“ gesunde Träger von HCV (das heißt, Personen mit normalem Serum ALT-Spiegel, ohne histologische Zeichen einer chronischen Hepatitis trotz HCV Virämie) können folglich vorkommen.
    Notes: Summary This study was designed to evaluate serum HCV-RNA, liver histology, and RIBA-II pattern in asymptomatic anti-HCV positive subjects with persistently normal or slightly (i.e. ≤1.5 times the upper limit of the normal range) elevated serum ALT levels. To this purpose, 22 asymptomatic anti-HCV positive subjects (11 men and 11 women, median age 40, range 21–70 years) underwent liver biopsy and determination of serum HCV-RNA. Positivity for anti-HCV was determined by ELISA-2 and by RIBA-II. Serum HCV-RNA was determined by PCR. Our data show that: 1) 9/22 symptom-free, anti-HCV positive subjects had histological features of chronic liver disease associated with ongoing HCV infection; 2) four subjects had no histological signs of chronic hepatitis and normal serum ALT levels despite positivity for serum HCV-RNA; 3) serum ALT levels did not discriminate HCV-RNA positive subjects with from those without chronic hepatitis; 4) in anti-HCV positive subjects with normal serum ALT levels, a positive RIBA-II pattern was not always predictive of HCV viraemia or chronic hepatitis while an indeterminate RIBA-II pattern was frequently associated with nonspecific liver changes or normal histology. In conclusion, based on these findings, “true” healthy carriers of HCV (i.e. subjects with normal serum ALT levels and no histological features of chronic hepatitis despite HCV viraemia) may exist.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...