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  • Springer  (20)
  • American Ceramics Society  (1)
  • American Geophysical Union  (1)
  • 2000-2004  (12)
  • 1975-1979  (10)
  • 1950-1954
  • 1
    Electronic Resource
    Electronic Resource
    Flextensional Barium Strontium Titanate Actuators (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: This paper describes the performance of the cymbal flextensional transducer using Dy-doped barium strontium titanate (BST) as the driver material. BST was first characterized for its dielectric and loss behavior as a function of temperature and electrical bias field. With no electrical bias, the transition temperature was measured to be near 20°C and have a dielectric constant 〉20 000. The strain of a BST disk was then measured and compared with other ceramics. At room temperature the strain and average effective piezoelectric d33 of this non-lead composition was slightly larger than Navy type I lead zirconate titanate (PZT-4) ceramic. The strain/field behavior was also measured as a function of temperature. Cymbal capped BST ceramic was found to have an amplified displacement of 28×, also very similar to type I ceramic. The stiffness of BST was found to be tunable by dc voltage and 2 to 3 times larger than that of PZT. This material has promise for applications in actuators and transducers with large generative force.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03400.x
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  • 2
    Electronic Resource
    Electronic Resource
    DDD poisoning in a loon and the identification of the hydroxylated form of DDD (1975)
    Springer
    Bulletin of environmental contamination and toxicology 14 (1975), S. 385-388 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01705500
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  • 3
    Electronic Resource
    Electronic Resource
    Lead and PCB's in canvasback ducks: Relationship between enzyme levels and residues in blood (1977)
    Springer
    Archives of environmental contamination and toxicology 5 (1977), S. 1-13 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Blood samples were taken for two successive years from canvasback ducks trapped in the Chesapeake Bay. The first winter (1972–1973) five plasma enzymes known to respond to organochlorine poisoning were examined. Abnormal enzyme elevations suggested that 20% of the population sampled (23/115 ducks) might contain organochlorine contaminants, but no residue analyses were performed. The second winter (1974) two of the same enzymes, aspartate aminotransferase and lactate dehydrogenase, and a third enzyme known to be specifically inhibited by lead, delta-aminolevulinic acid dehydratase, were assayed in 95 blood samples. Blood residues of organochlorine compounds and of lead were determined in representative samples, and the correlations between residue levels and enzyme changes were examined. The enzyme bioassays in 1974 indicated that lead was a more prevalent environmental contaminant than organochlorine compounds in canvasback ducks; 17% of the blood samples had less than one-half of the normal delta-aminolevulinic acid dehydratase activity, but only 11% exhibited abnormal aspartate aminotransferase or lactate dehydrogenase activities. These findings were confirmed by residue analyses that demonstrated lead concentrations four times higher than background levels, but only relatively low organochlorine concentrations. There was a highly significant inverse correlation between delta-aminolevulinic acid dehydratase activity and blood lead concentrations (P〈0.01), and a weaker but significant correlation between plasma aspartate aminotransferase activity and blood PCB concentrations (P〈0.05). It was apparent that delta-aminolevulinic acid dehydratase activity in the blood provided a sensitive and precise estimate of lead contamination in waterfowl. In canvasback ducks 200 ppb of lead in the blood caused a 75% decrease in delta-aminolevulinic acid dehydratase activity, a magnitude of enzyme inhibition that disturbs heme synthesis and is regarded as detrimental in humans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220886
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  • 4
    Electronic Resource
    Electronic Resource
    Plasma prostaglandin E levels in Paget’s disease: Effect of indomethacin (1979)
    Springer
    Calcified tissue international 29 (1979), S. 5-6 
    Details
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02408048
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  • 5
    Electronic Resource
    Electronic Resource
    Classical Behavior of the Dirac Bispinor (2000)
    Springer
    Foundations of physics 30 (2000), S. 35-57 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is usually supposed that the Dirac and radiation equations predict that the phase of a fermion will rotate through half the angle through which the fermion is rotated, which means, via the measured dynamical and geometrical phase factors, that the fermion must have a half-integral spin. We demonstrate that this is not the case and that the identical relativistic quantum mechanics can also be derived with the phase of the fermion rotating through the same angle as does the fermion itself. Under spatial rotation and Lorentz transformation the bispinor transforms as a four-vector like the potential and Dirac current. Previous attempts to provide this form of transformational behavior have foundered because a satisfactory current could not be derived.(14)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003686924816
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  • 6
    Electronic Resource
    Electronic Resource
    Petrology, volume and age relations of alkaline and saturated peralkaline volcanics from Terceira, Azores (1976)
    Springer
    Contributions to mineralogy and petrology 54 (1976), S. 293-313 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Four volcanoes form Terceira, one of the islands of the Azores group; three contain both basaltic and peralkaline and one only peralkaline rocks. A recently active basaltic fissure zone trends NW-SE across the island. The rocks fall into the alkaline olivine basalt suite although some young basalts are of transitional affinity. The geochemistry shows two general basaltic series: 1) undersaturated, found in lavas of the oldest volcano and in some recent fissure zone basalts and hawaiites; 2) saturated, found in the younger basaltic lavas. Since the emergence of Terceira there has been a contemporaneity of basalt and salic peralkaline lavas. The younger rocks show a bimodal composition distribution, the most voluminous compositions being alkali olivine basalt and comendite with negligible volume in the benmoreite-trachyte range. Two processes appear viable for the derivation of voluminous oversaturated peralkaline rocks: 1) partial melting of upper mantle material giving small magma batches of contrasting composition or 2) fractionation from a transitional basaltic parental magma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389409
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  • 7
    Electronic Resource
    Electronic Resource
    Location and mapping of the powdery mildew resistance gene MlRE and detection of a resistance QTL by bulked segregant analysis (BSA) with microsatellites in wheat (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 1217-1224 
    Details
    ISSN: 1432-2242
    Keywords: Key words Triticum aestivum ; Blumeria graminis f. sp. tritici ; QTL mapping ; Molecular markers ; Disease resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Powdery mildew (Blumeria graminis f. sp. tritici) is one of the most damaging diseases of wheat (Triticum aestivum). The objective of this study was to locate and map a recently identified powdery mildew resistance gene, MlRE, carried by the resistant line RE714 using microsatellites uniformly distributed among the whole genome together with a bulked segregant analysis (BSA). The bulks consisted of individuals with an extreme phenotype taken from a population of 140 F3 families issued from the cross between RE714 (resistant) and Hardi (susceptible). The population had been tested with three powdery mildew isolates at the seedling stage. Qualitative interpretation of the resistance tests located the MlRE gene on the distal part of the long arm of chromosome 6A. A subsequent quantitative interpretation of the resistance permitted us to detect another resistance factor on a linkage group assigned to chromosome 5D, which was constructed with microsatellites for which a polymorphism of intensity between bulks was observed. This quantitative trait locus (QTL) explained 16.8– 25.34% of the total variation. An interaction between both the resistant factor (MlRE and the QTL) was found for only one of the isolates tested. This study shows the advantage of making a quantitative interpretation of resistant tests and that the use of microsatellites combined with BSA is a powerful strategy to locate resistance genes in wheat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051427
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  • 8
    Electronic Resource
    Electronic Resource
    Chaleurs differentielles d'adsorption de l'anhydride carbonique sur differents tamis moleculaires (1977)
    Springer
    Journal of thermal analysis and calorimetry 11 (1977), S. 51-60 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Les chaleurs différentielles d'adsorption de l'anhydride carbonique par la mordénite sodique et différents tamis moléculaires (NaX, NaY, HZ, Na0.25Ca0.375A) ont été mesurées par calorimétrie. Pour la mordénite sodique, l'étude a porté sur un large domaine de température et de pression: −77〈T〈+120
    Abstract: Zusammenfassung Die Differential-Adsorptionswärmen von CO2 an Natrium-mordenit und verschiedenen Molekularsieben (NaX, NaY, HZ, Na0.25 Ca0.375 A) wurden kalorimetrisch bestimmt. Das erste Zeolith wurde in einem weiten Temperatur- und Druckbereich pntersucht (−77
    Notes: Abstract Differential heats of adsorption of CO2 by sodic mordenite and several molecular sieves (NaX, NaY, HZ, Na0.25 Ca0.375A) are measured calorimetrically. For the first zeolite, a wide range of temperature and pressure is studied: −77
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02104083
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  • 9
    Electronic Resource
    Electronic Resource
    The mechanism of cobalamin-dependent rearrangements (1977)
    Springer
    Molecular and cellular biochemistry 15 (1977), S. 89-108 
    Details
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Adenosylcobalamin-dependent rearrangements are enzyme catalyzed reactions in which a hydrogen atom is transferred from one carbon atom to an adjacent one in exchange for a group X which migrates in the opposite direction. In the hydrogen transfer step, the mechanism of which is reasonably well understood, the cofactor serves as an intermediate hydrogen carrier. The transfer of hydrogen to the cofactor involves homolysis of the carbon-cobalt bond to generate cob(II)alamin and the 5′-deoxyadenos-5′-yl radical, followed by abstraction of a hydrogen atom from the substrate to form 5′-deoxyadenosine and the substrate radical. After migration of group X, the hydrogen atom is returned to the product radical by the reverse of the above reactions to generate the final product and reconstitute the cofactor. In contrast to the transfer of hydrogen, the mechanism of group X migration is poorly understood. Many reactions mechanisms have been proposed on chemical grounds, but there is insufficient biochemical evidence to permit a choice among these proposals. A quantity of negative evidence has accumulated suggesting that group X migration does not involve alkylation of the cobalt of cobalamin by the substrate, but in the absence of firm data supporting an alternative mechanism, even this weak conclusion must be regarded as provisional.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01793331
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  • 10
    Electronic Resource
    Electronic Resource
    Fluorogenic Probes Applied to the Study of Induced Oxidative Stress in the Human Leukemic HL60 Cell Line (2000)
    Springer
    Journal of fluorescence 10 (2000), S. 167-167 
    Details
    ISSN: 1573-4994
    Keywords: Fluorogenic probes ; microspectrofluorometry ; HL60 cell line ; oxidative stress ; thiol status
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Development of microspectrofluorometric methods using specific fluorogenic probes has provided precious help in studying in situ oxidative stress and cellular protective systems. The aim of this study was to determine ROS production concomitantly with a modification of the intracellular thiol pool after applying an oxidative stress to a nonadherent cell model represented by the HL60 cell line. The dichlorodihydrofluorescein diacetate (H2DCFDA) probe assessed the kinetic production of ROS by cells submitted to the chemical oxidant t-butylhydroperoxide with a high signal/noise ratio. The probe sensitivity permitted us to detect endogenous ROS production in HL60 cells and the protective effect of N-acetyl cysteine against ROS. The chloromethylfluorescein diacetate probe (CMFDA) permitted us to evaluate the thiol depleting effect of N-ethyl maleimide. Complete thiol depletion was associated with a moderate increase in ROS production. The cell viability was determined with calcein-AM, which gave results similar to those with the tetrazolium dye. This probe was not affected by intracellular pH and did not required an extraction step, unlike tetrazolium dye. In conclusion, cell-permeant fluorogenic probes are useful and sensitive tools to determine in situ ROS production concomitantly with consecutive change in the thiol system in a living and non-adherent cell model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009499210857
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