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  • Articles: DFG German National Licenses  (10)
  • 1995-1999  (4)
  • 1975-1979  (2)
  • 1970-1974  (4)
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  • Articles: DFG German National Licenses  (10)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5711-5713 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The orientation of human red blood cells (RBCs) was controlled by the application of magnetic and electric fields. Because of their anisotropic diamagnetism, RBCs orient parallel to strong magnetic fields. The electric orientation of erythrocytes is also caused by electric dipoles induced by an electric field. The RBCs orientation is parallel to both the electric and magnetic fields. A 4–5 kV/m alternating current (ac) electric field (10–200 kHz, sine wave) was applied to RBCs suspended in a phosphate buffer solution using a pair of platinum black electrodes spaced 200–250 μm apart. An 8 T magnetic field was applied to the RBCs perpendicular to the direction of the electric field. It was observed that all RBCs were oriented in the same direction and parallel to the electric and magnetic fields. By the application of a horizontal 8 T magnetic field and a 4 kV/m ac electric field positioned perpendicular to one another, the RBCs oriented horizontally and their sedimentation rate was decreased by 18%. The flowing rate of the 10% RBCs suspension was decreased by 7.6% with the application of an 8 T magnetic field and a 4 kV/m ac electric field perpendicular to the direction of the suspension flow. It was observed that flowing RBCs were oriented perpendicular to the direction of the flow by the application of the fields, when the velocity of the suspension of RBCs was less than 300 μm/s. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 10 (1971), S. 2935-2940 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4318-4320 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To clarify the effects of strong magnetic fields on biological membranes, changes in the capacitance of a black membrane, which is an artificially formed lipid bilayer membrane, were observed under strong magnetic fields up to 8 T. The effects of dc electric fields on a black membrane were also investigated. The membrane was suspended across a 0.8 mm diam hole in a teflon vessel immersed in a phosphate buffer solution. The capacitance of the membranes was increased through the application of magnetic fields perpendicular to the membranes. When a 4 T magnetic field was applied to the membrane, the capacitance change reached 96%. The capacitance of the membranes varied according to the size of the outer vessel in which the teflon vessel was placed. It is thought that the changes in the capacitance of the membrane were caused by the difference between the hydrostatic pressure on the outer and the inner sides of the teflon vessel. This difference in hydrostatic pressure was due to changes in the surface of the solution caused by the effect of a magnetic-field gradient on the solution. No effects except those due to mechanical deformation due to changes in hydrostatic pressure were observed on the lipid bilayer membrane from static magnetic fields up to 8 T. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 171-174 (Oct. 1999), p. 709-716 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1437-7772
    Keywords: Key words p53 ; Lymph node metastasis ; Colorectal cancer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background. Lymph node metastasis has been recognized as the most reliable prognostic factor for colorectal cancer. Of late, the clinical significance of p53 as a prognostic factor has been reported. The purpose of the current study was to elucidate the significance of these two factors in combination as a prognostic indicator for colorectal cancer. Methods. One hundred forty-four patients with colorectal cancer were examined. The expression of p53 was determined by immunohistochemical staining. Patient data, lymph node metastasis, p53 expression, recurrence rate, 5-year survival, and disease-free survival were studied. Results. The recurrence rate for patients with p53− and n1 in combination was 21%, and that for patients with p53+ and n1 in combination was 63%, a significant difference. The 5-year survival rate for patients with p53− and n1 in combination was not significantly different from that for patients with p53+ and n1 in combination (78.7% vs. 57.5%); however, the 5-year disease-free survival rate for patients with p53− and n1 in combination was significantly better than that for patients with p53+ and n1 in combination (78.6% vs. 38.2%). Conclusion. The combination criterion of lymph node metastasis and p53 expression should be a useful prognosticator for colorectal cancer.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Annals of hematology 36 (1978), S. 285-298 
    ISSN: 1432-0584
    Keywords: Aplastische Anämie ; Schwangerschaft ; Aplastic anemia ; Pregnancy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Our recent experience on six cases of aplastic anemia complicated with pregnancy is described. In addition, 43 similar cases were collected from the literature and reviewed to analyze some prognostic aspects of this relatively rare but potentially serious complication. Clinical and hematological data were treated to extract some clinically meaningful factors in relation to the success and failure of pregnancy. Among initial hematological parameters, no significant difference was found between successful and unsuccessful cases with an exception of hemoglobin concentration. The patients diagnosed as aplastic anemia prior to conception demonstrated an better outcome of pregnancy as well as survival rate of mother when compared with those diagnosed during pregnancy. Mortality has apparently improved after the late 1950's. Success rate of pregnancy before 1958 was 21% while it was 67% and 71% in the era of 1959–1969 and after 1970, respectively. However, hemorrhage and infection remained to be two major causes of maternal death in both eras. Based on these observations, the currently recommendable attitude to this complication is discussed.
    Notes: Zusammenfassung Berichte über Schwangerschaften bei aplastischer Anämie oder das Auftreten einer aplastischen Anämie in der Schwangerschaft sind selten. Anhand von 6 eigenen derartigen Fällen und von 43 Fällen aus der Literatur wurden die hämatologischen und klinischen Befunde in Hinsicht auf ihre prognostische Bedeutung untersucht. Bei den hämatologischen Parametern war lediglich die Hämoglobinkonzentration von prognostischer Bedeutung. Bei Auftreten der aplastischen Anämie vor der Schwangerschaft war die Prognose besser als bei Auftreten während der Schwangerschaft. Der Prozentsatz der erfolgreich ausgetragenen Schwangerschaften stieg von 21% vor 1958 auf 67% in der Zeit von 1959 bis 1969 und auf 71% nach 1970. Blutungen und Infektionen waren die beiden wichtigsten mütterlichen Todesursachen. Aus den Ergebnissen ist abzuleiten, daß bei ausgeprägtem Kinderwunsch und gutem Allgemeinzustand von einer Schwangerschaft bei bestehender aplastischer Anämie nicht immer abgeraten werden muß und daß andererseits bei einer progredienten aplastischen Anämie, die in der Schwangerschaft auftritt, möglichst früh eine Schwangerschafts-unterbrechung erfolgen muß.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0827
    Keywords: Vitamin D ; Mineralization ; Dentin ; Rickets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract A study was undertaken to ascertain whether vitamin D has a direct action on the mineralization of the dentin in rats made rachitic by a diet low in calcium and deficient in vitamin D. Physiological amounts of vitamin D, given orally to rachitic rats, increased their serum calcium from 4.8±0.5 mg/100 ml to 7.5±0.4 mg/100ml. The mineralization of dentin recovered markedly, although osteoporosis occurred in bone trabeculae. The results suggest that vitamin D increases serum calcium by accelerating bone resorption and that the increased serum calcium level acts directly to mineralize the dentin. When calcium was given to rachitic rats by subcutaneous injection, the serum calcium level increased and mineralization of dentin recovered to the same extent as that observed in rats given vitamin D. These results indicate that recovery of mineralization of rachitic dentin depends primarily on recovery of the serum calcium level and that vitamin D is an indirect factor in the mineralization process.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The thin-layer chromatographic behavior of 57 metals on a weakly acidic cation exchanger, carboxymethyl (CM) cellulose, has investigated systematically in sulfuric acid (0.01–1.0 M) and the acidic ammonium sulfate media. Thin-layer plates of a microcrystalline cellulose, Avicel SF, were also used to compare with the chromatographic behavior of the metals in the acidic sulfate system. The Rf values obtained for many metals tested on CM-cellulose plates increase with increasing concentration of sulfuric acid. Most of metals tested are distributed chromatographically on the CM-cellulose in the low acid concentration. The characteristic retention of many metals, including sulfato-complexes forming metals, on the CM-cellulose can be observed in ammonium sulfate solutions of a low concentration of the acid. Useful multicomponent separations of analytical interest on CM-cellulose layers are presented to demonstrate the use of Rf measurements for predicting separations in the acid and the acidic ammonium sulfate systems.
    Type of Medium: Electronic Resource
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