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
  • 1
    ISSN: 1432-1440
    Keywords: Hepatitis B ; HBe antigen ; ELISA ; Infectiousness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary By means of an ELISA the level of hepatitis B e-antigen (HBeAg) titre was determined in 51 patients with acute and 123 patients with persistent hepatitis B virus (HBV) infection. We also investigated 120 sera of these patients for infectivity by detecting HBV-specific DNA polymerase (DNA-P). Additional determination of the HBeAg titre revealed that the detection of HBeAg at a dilution of at least 1:50 correlates with the detection of DNA-P in 95% of cases, while in sera with an HBeAg titre of 1:25 or less DNA-P is only detectable in up to 5% of cases. Since the detection of DNA-P indicates high infectivity, certain titres of HBeAg can be employed to differentiate three different degrees of infectivity: (1) Sera without HBeAg show no or only little infectivity; (2) sera containing HBeAg≧1:50 are highly infectious; (3) HBeAg titres up to 1:25 indicate a medium degree of infectivity. These three markers for different degrees of infectivity were applied to study the course of infectivity during acute and persistent forms of HBV infection. In acute hepatitis B the period for the elimination of HBeAg is independent of the HBeAg titre in the first serum sample. In all cases the elimination of HBeAg in acute hepatitis B did not exceed 4 months. Patients with persistent HBV infection and an initial HBeAg titre ≧1:50 remained at this high degree of infectivity for at least 18–30 months in 70% of cases. Only 30% of this collective showed a decrease in infectivity. However, 40% of the patients with persistent hepatitis B with an initial low titre of HBeAg showed an increase in infectivity, while 60% remained low or converted to anti-HBe. This confirms that an initially high degree of infectivity in the persistent form of hepatitis B is an unfavourable sign. Also, the present study demonstrates that the correlation of the amount of Dane particles and HBeAg titre is not due to conversion of spontaneously released hepatitis B core antigen (HBcAg) from circulating Dane particles to HBeAg. By means of the ELISA the half-life of HBeAg in vitro was determined to be 12–24 h.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-1831
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Callithrix jacchus (CJ) marmoset monkeys can be latently infected withHerpesvirus saimiri (HVS). In order to determine whether this resistance to the oncogenic potential of HVS could be due to the immune surveillance, azathioprine, a known immunosuppressive drug, was given to 7 latently infected CJ marmosets. The animals died within 147 days probably from side effects caused by azathioprine, but no animal developed a tumor.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 197 (1993), S. 646-653 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 194 (1993), S. 691-697 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Infection 9 (1981), S. 67-68 
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Escherichia coli strains were isolated from weekly feces samples from several healthy persons. In 89% of the strains plasmids were found which presented a wide range of molecular weight without similar patterns on various occasions. The effect of ampicillin on the plasmid population of the intestinal flora ofE. coli was examined in three healthy individuals. An individual specific type of plasmid was found in the period during and after (up to 45 days) the administration of the antibiotic. The genes specifying the TEM type β-lactamase (Tn 3) were demonstrated in this plasmid species.
    Notes: Zusammenfassung Aus Stuhlproben von gesunden Probanden wurden in wöchentlichen AbständenEscherichia coli-Stämme isoliert. Bei 89% aller Isolate fanden sich Plasmide verschiedenster molekularer Größe ohne auffällige Gesetzmäßigkeiten über einen längeren Zeitraum. Bei drei Probanden wurde die Wirkung von Ampicillin auf die Plasmidbesiedelung der intestinalenE. coli-Flora untersucht. Als Folge war ein individual-spezifischer Plasmidtyp mit jeweils einheitlicher Größe während und auch noch bis zu 45 Tagen nach Ende der Antibiotikagabe nachweisbar. Die Gene für die TEM-Typ β-Laktamase (Tn 3) wurden in dieser Plasmidspezies nachgewiesen.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Wir untersuchten, ob in Seren, die persistierend Antikörper gegen rekombinante Antigene des Hepatitis-C-Virus aufwiesen, gleichzeitig Hepatitis C RNA nachweisbar ist. Der Schwerpunkt der Untersuchungen lag bei Patienten mit chronischer Hepatitis. Die Polymerase-Kettenreaktion ermöglicht den direkten Nachweis viraler Sequenzen. Dadurch läßt sich eine Aussage über die potentielle Infektiösität des Patienten treffen. Von 85 anti-HCV-positiven Patienten waren 83 gleichzeitig in der HCV-PCR positiv, nur zwei waren negativ. In den von uns untersuchten sieben Leberbiopsaten konnten wir in jedem Fall HCV-spezifische RNA nachweisen. Seren von drei Patienten mit klinischem Verdacht auf Hepatitis Non-A, Non-B waren sowohl in der HCV-Serologie als auch in der PCR negativ. In unserer Studie betrug die Korrelation zwischen positivem HCV-Antikörpernachweis und dem HCV-RNA Nachweis 97,6%.
    Notes: Summary To determine whether the persistent presence of antibodies to recombinant antigens of the hepatitis C virus (HCV) corresponds to the presence of hepatitis C virus RNA in the same serum, 85 anti-HCV positive patients were studied by the polymerase chain reaction (PCR). The focus of the research was on patients with chronic hepatitis. Eighty- three patients were found to be positive by PCR; only two were negative. In addition, liver biopsies taken from seven patients positive for anti-HCV were shown to contain HCV-specific RNA. Sera collected from three patients suspected to have NANB hepatitis on the basis of clinical symptoms were negative both for HCV antibodies and HCV RNA. The correlation between HCV antibody positivity and detection of HCV RNA was 97.6%.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Archives of virology 33 (1971), S. 306-318 
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The viruses of equine arteritis, rubella, bovine viral diarrhea and hog cholera have been concentrated and purified. In preparations negatively stained with uranyl acetate they appeared as roughly spherical particles about 60 nm across. Within their envelopes isometrical cores were detected after spontaneous disruption or upon pretreatment; they are considered to be the viral nucleocapsids. The lower coefficients of variation calculated for the nucleocapsids as compared with those of the respective virus particles indicate that the pronounced heterogeneity in virion size must be attributed to the envelope. Ringlike morphological subunits observed on the surface of the spherical nucleocapsids and the presence of centra] core components suggest that the four viruses should be classified as togaviruses (lipid-containing RNA viruses with cubic symmetry of the nucleocapsid), together with arbo-A-viruses. The bovine viral diarrhea and hog cholera viruses differ from the other viruses studied in their lower sedimentation and density values, their lesser nucleocapsid diameters and an unusual “rosary” envelope structure. A further subdivision of the togavirus group is discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary.  Generally, the maximum activities of the protein kinases A* (PKA) and C (PKC) show an optimum value for their substrate concentrations rather than a saturation curve; at high substrate concentrations, the kinase activity is completely abolished. The C- and N-truncated form of the non-structural protein 3 (NS3) of hepatitis C virus (HCV) (HCV-polyprotein-(1 189–1 525)) abolishes the inhibiting effect of the substrate, yielding saturable Michaelis-Menten kinetics of PKA and its catalytical domain (C subunit). In contrast, HCV-polyprotein-(1 189–1 525) activates PKC with increasing Vmax, while it abolishes the substrate inhibition of its catalytical domain (M-kinase) through a mechanism analogous to that of PKA and C subunit. PKC isoforms α, β and γ investigated are similarly activated by HCV-polyprotein-(1 189–1 525). Our data suggest that NS3 attenuates the substrate inhibition through a generalized mechanism operating mainly on the substrate level that directly results from a specific protein-protein interaction. In the case of the PKC, an additional kinase activating mechanism operates on the enzyme level. Both actions of NS3, the attenuation of the substrate inhibition and the activation of PKC, could not be explained by classical means that predict autophosphorylation to enhance the rate of substrate phosphorylation. The results are discussed in view of similar activities displayed by matchmakers and some molecular chaperones.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 253 (1975), S. 71-72 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 Development of serum antibodies against HVS in CT marmoset monkeys immunised with killed HVS 14 0.0 c 13 0.0 c 18 1.0 c 27 1.5 c 26 1.7 c 26 2.3 c 40 〉3.3 1:32 39 3.2 c 42 〉3.5 1:64 73 〉3.3 1:16 60 3.2 c 56 〉3.5 1:64 97 〉3.3 1:8 83 2.2 c 123 2.5 c 208 〉3.3 c 153 1.5 ...
    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...