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  • 2000-2004  (42)
  • 1975-1979  (29)
  • 1970-1974  (27)
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  • 1
    Electronic Resource
    Electronic Resource
    Radiation enhanced diffusion of Ti in Al2O3 (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 5058-5064 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Titanium bulk and dislocation diffusion coefficients at 1000 °C have been determined for Ti in single crystal α-Al2O3(0001) for three types of samples: (i) Ti evaporated onto Al2O3, (ii) 48Ti+at 100 eV deposited onto Al2O3, and (iii) 48Ti+ at 100 eV deposited onto radiation damaged Al2O3 (damage inflected by implantation of 46Ti+ at 7 keV). Diffusion penetration profiles were obtained by using secondary ion mass spectrometry depth profiling techniques. For the deposited and implanted Ti+ samples, the bulk diffusion coefficients (D) are 5.4×10−21 and 5.6×10−17 m2 s−1, respectively, and dislocation diffusion coefficients are 3.6×10−17 and 1.4×10−12 m2 s−1, respectively. Comparing the D's for Ti in the undamaged and damaged Al2O3, the D's for the latter samples are higher by a factor of 104–105, reflecting the radiation enhanced diffusion due to the defect structure inflected by the implanted 7 keV 46Ti+. Comparing the D's for Ti deposited onto Al2O3 (both the evaporated and 100 eV 48Ti+ samples) with those for Cr deposited onto Al2O3, the Ti D's are larger by a factor of 10, reflecting the influence of the valence state of the cation. These results show that cationic diffusion coefficients in Al2O3 can be controlled by varying the level of defects in the crystal. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1286222
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  • 2
    Electronic Resource
    Electronic Resource
    Angular momentum in ion-molecule reactions (1979)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 101 (1979), S. 7189-7195 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00518a011
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  • 3
    Electronic Resource
    Electronic Resource
    Pharmacokinetic model based on circulatory transport (1979)
    Springer
    European journal of clinical pharmacology 16 (1979), S. 287-293 
    Details
    ISSN: 1432-1041
    Keywords: linear system theory ; perfusion model ; cardiac output ; pulmonary extraction ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Assessment of pharmacokinetics in terms of circulatory drug transport is proposed using the methods of linear system theory. In this model-independent approach drug distribution and disposition are characterized by the total extraction ratio, the mean residence time in the body and the volume of distribution at steady state. In analyzing concentration(c)-time(t) data, the procedure requires calculation only of the areas under the c(t)-and c(t)×t-curves to estimate kinetic parameters, and for prediction of the steady state concentration following continuous infusion or multiple doses. Pulmonary clearance of drugs is included in the theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00608408
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Wirkung von Dimilin auf die Imagines und Eier des Erlenblattkäfers, Agelastica alni L. (Coleopt., Chrysomelidae) (1977)
    Springer
    Journal of pest science 50 (1977), S. 161-164 
    Details
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Effects of Dimilin on adults and eggs of Agelastica alni L. (Coleopt., Chrysomelidae) In consequence of treating adults ofA. alni with Dimilin the median number of egg clusters per female decreased about by a half. The absolute number of eggs was not affected. On the contrary the number of fertilized eggs as well as the number of hatched larvae decreased considerably. In the controlbreedings there were no differences between the quote of fertilized eggs and that of hatched eggs, but the treatment of adults with Dimilin resulted in a great difference between these quotes. The behaviour of male and female adults did'nt show changes. The eggs were susceptible to Dimilin, the young eggs more than the elder ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02285742
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  • 5
    Electronic Resource
    Electronic Resource
    Starch-gel electrophoretic variants of erythrocyte 6-phosphogluconate dehydrogenase in asian macaques (1971)
    Springer
    Primates 12 (1971), S. 175-182 
    Details
    ISSN: 0032-8332
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Five alleles with eight electrophoretic phenotypes of 6-phosphogluconate dehydrogenase were found in 1,195 blood samples from fourteen populations of nine macaque species.Macaca fascicularis from Malaya showed the most polymorphism, with three Pgd alleles resulting in five phenotypes.Macaca mulatta, M. speciosa, M. nemestrina, andM. cyclopis had two alleles each (although the last two species showed a high percentage of homozygosity). The remaining four species (M. fuscata, M. radiata, M. maura, andM. nigra) were homozygous for the Pgda allele. The predominance of Pgda was observed in all macaque species, exceptM. speciosa which showed a high (57%) frequency of Pgdd. The distinctive position ofM. speciosa with regard to 6PGD variants parallels observations that indicate that this species carries transferrin and carbonic anhydrase I alleles in different frequencies from those of the other macaque species. Other similarities between the patterns of transferrin and 6PGD variations include a tendency toward homozygosity at the Pgd locus in the insular macaque forms. However, in this case only the Pgda allele is involved, while some variation was found in the transferrin alleles fixed by the founder effect in the insular macaques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01730393
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal expansion of amorphous Zr Al Cu Ni in the vicinity of the glass transition (2000)
    Springer
    The European physical journal 13 (2000), S. 37-40 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 65.70.+y Thermal expansion and density changes; thermomechanical effects. - 61.43.Dq Amorphous semiconductors, metals, and alloys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The thermal expansion of non-crystalline Zr65Al7.5Cu17.5 Ni10 has been studied in the range of the glass transition and in the undercooled liquid using a dilatometric device. The measuring technique used permits reliable experimental results up to 40 K above the glass transition temperature. The linear thermal expansion coefficient obtained is almost constant in the glassy state with a value of . It discontinuously increases at the glass transition temperature yielding a value of in the undercooled liquid. The results are compared with specific heat measurements of the amorphous material in this temperature range and are interpreted in the framework of a cluster model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050007
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  • 7
    Electronic Resource
    Electronic Resource
    Device to test manometric systems (1976)
    Springer
    Medical & biological engineering & computing 14 (1976), S. 603-608 
    Details
    ISSN: 1741-0444
    Keywords: Electromanometer ; Frequency response
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire Dans le but de connaître les performances exactes des systèmes manométriques utilisés au cours des expériences, et en la salle d'opération, nous avons fabriqué un dispositif simple permettant d'obtenir rapidement et facilement une image visuelle de la réponse en amplitude et en fréquence de tels systèmes.
    Abstract: Zusammenfassung Um die genauen Leistungsmerkmale von manometrischen Systemen festuzustellen, die bei Experimenten und im Operationssaal Verwendung finden, haben wir ein einfaches Gerät gebaut, durch das man schnell und leicht ein sichtbares Bild des Frequenz-Amplitudengangbereichs eines solchen Systems erhält.
    Notes: Abstract As a result of the need to know the exact performance characteristics of the manometry systems utilised during the course of experiments, and in the operating room, we have constructured a simple device by means of which a visual image of the frequency-amplitude response envelope of such systems can be quickly and easily obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02477036
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  • 8
    Electronic Resource
    Electronic Resource
    Low-cost analogue tape recorder using an ordinary ‘hi-fi’ cassette player (1979)
    Springer
    Medical & biological engineering & computing 17 (1979), S. 683-687 
    Details
    ISSN: 1741-0444
    Keywords: Physiological signals ; Recorder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02440917
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  • 9
    Electronic Resource
    Electronic Resource
    Study of pig valve heterografts by X-ray diffraction (1975)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 9 (1975), S. 79-95 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The study of collagen fibers by X-ray diffraction, utilizing semiquantitative indices for appraisal of “structuration” and “orientation” was applied to 30 aortic valve grafts. These grafts, of pig origin, were studied in the fresh state, after tanning with aldehydes, and after having been implanted in patients for at least 18 months. It was shown that the collagen fibers are preferentially orientated parallel to the transverse axis of the valve cusps, and that this arrangement, enhanced by tanning, had a tendency to disappear in the post-implantation samples. The structuration index which concerns the fibril network was also augmented by tanning, and was found a little high or slightly diminished in post-implantation cusps. Evidence for a new compound, probably fibrin, was found in the diffraction patterns of implanted cusps, but crystallized calcium was noticeably absent.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820090108
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  • 10
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    Adaptive evolution of cytochrome c oxidase subunit VIII in anthropoid primates (2003)
    National Academy of Sciences
    Details
    Publication Date: 2003-04-25
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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