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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of the middle and inner ear structures: comparison of hybrid rendering, virtual endoscopy and axial 2D source images (1999)
    Springer
    European radiology 9 (1999), S. 1851-1858 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Temporal bone ; CT ; Ear ; middle ; Ear ; labyrinth ; Three-dimensional CT ; hybrid rendering ; Virtual endoscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Recent developments in 3D reconstructions can enhance the quality and diagnostic value of axial 2D image data sets with direct benefits for clinical practice. To show the possible advantages of a hybrid rendering method [color-coded 3D shaded-surface display (SSD)- and volume rendering method] with the possibility of virtual endoscopy we have specifically highlighted the use in relation to the middle and inner ear structures. We examined 12 patients with both normal findings and postoperative changes, using image data sets from high-resolution spiral computed tomography (HRSCT). The middle and inner ear was segmented using an interactive threshold interval density volume-growing method and visualized with a color-coded SSD rendering method. The temporal bone was visualized using a transparent volume rendering method. The 3D- and virtual reconstructions were compared with the axial 2D source images. The evaluated middle and inner ear structures could be seen in their complete form and correct topographical relationship, and the 3D- and virtual reconstructions indicated an improved representation and spatial orientation of these structures. A hybrid and virtual endoscopic method could add information and improve the value of imaging in the diagnosis and management of patients with middle or inner ear diseases making the understanding and interpretation of axial 2D CT image data sets easier. The introduction of an improved rendering algorithm aids radiological diagnostics, medical education, surgical planning, surgical training, and postoperative assessment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050934
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  • 2
    Electronic Resource
    Electronic Resource
    Polychronicity and the Inventory of Polychronic Values (IPV): The development of an instrument to measure a fundamental dimension of organizational culture (1999)
    Bradford : Emerald
    Journal of managerial psychology 14 (1999), S. 205-231 
    Details
    ISSN: 0268-3946
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Psychology , Economics
    Notes: The ten-item Inventory of Polychronic Values (IPV), a psychometric measure of polychronicity (the extent to which people in a culture prefer to be engaged in two or more tasks or events simultaneously and believe their preference is the best way to do things), was developed using data from 11 samples (N = 2,190) collected from bank employees, undergraduate students, hospital personnel, dentists and their staffs, and state agency managers. Principal components, alpha, correlation, and confirmatory factor analyses supported the IPV in its internal consistency, test-retest reliability, content adequacy, construct validity (both discriminant and convergent), and nomological validity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02683949910263747
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  • 3
    Electronic Resource
    Electronic Resource
    Migration and coalescence of Xe nanoprecipitates in Al induced by electron irradiation at 300 K (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2611-2613 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Effects of 1 MeV electron irradiation on Xe precipitates in Al, formed by ion implantation, have been observed in situ by high-voltage transmission electron microscopy. Individual Xe precipitates undergo melting and recrystallization, migration which leads to coalescence, and shape changes. These processes are driven by the production of defects without either cascade defect production or the introduction of additional Xe atoms. Precipitate migration is due to an irradiation-induced surface diffusion process on the Xe/Al interfaces. Coalescence of close precipitates is enhanced by directed motion as a result of the net displacement of Al atoms out of the volume between them. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123913
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  • 4
    Electronic Resource
    Electronic Resource
    Lasing in quantum-dot ensembles with sharp adjustable electronic shells (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 986-988 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Quantum-dot laser diodes with up to five well-defined electronic shells are fabricated using self-assembled quantum dots (QDs) grown by molecular-beam epitaxy. Shape-engineered stacks of self-aligned QDs with improved uniformity are used to increase the gain in the active region. Lasing is observed in the upper QD shells for small-gain media, and progresses towards the QD ground states for longer cavity lengths. We obtained at 77 K thresholds of Jth=15 A/cm2 for a 2 mm cavity lasing in the first excited state (p shell), and Jth=125 A/cm2 for a 1 mm cavity lasing in n=3 (d shell). At 300 K for a 1 mm cavity, Jth is 490 A/cm2 with lasing in n=4 (f shell). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124253
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  • 5
    Electronic Resource
    Electronic Resource
    Intermixing in quantum-dot ensembles with sharp adjustable shells (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2374-2376 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: State-filling spectroscopy is used to study the effects of alloy intermixing in quantum-dot (QD) ensembles having well-defined electronic shells. Rapid thermal annealing is performed on samples of self-assembled QDs grown with different intersublevel energy spacings. For InAs/GaAs QDs, the intersublevel is tuned between ∼90 and 25 meV. The intense and sharp shell structures observed in photoluminescence indicate unambiguously that the QDs retained their zero-dimensional density of states after the diffusion of the potential, which also causes strong blueshifts (up to ∼200 meV) and a pronounced narrowing of the inhomogeneously broadened emission (down to ∼12 meV). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125019
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  • 6
    Electronic Resource
    Electronic Resource
    Cation Disorder and Vacancy Distribution in Nonstoichiometric Magnesium Aluminate Spinel, MgO·xAl2O3 (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), 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: Neutron diffractometry and X-ray diffractometry were used to characterize the cation disorder and vacancy distribution in nonstoichiometric spinel, MgO·xAl2O3, where x greaterthan equal to 1.0. Both synthetic and natural samples were examined. Least-squares refinements of integrated intensities for single crystals and Rietveld profile refinements for powders yielded the average scattering “power” from tetrahedral and octahedral sites within the almost-perfect cubic close-packed oxygen sublattice. The cation disorder was calculated assuming models in which the vacancies resided on tetrahedral, octahedral, or both types of sites. No degree of cation disorder was consistent with the tetrahedral vacancy model, and vacancies most likely resided on octahedral sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb02242.x
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  • 7
    Electronic Resource
    Electronic Resource
    Fertile Solanum tuberosum+S. commersonii somatic hybrids as sources of resistance to bacterial wilt caused by Ralstonia solanacearum (1999)
    Springer
    Theoretical and applied genetics 98 (1999), S. 1272-1278 
    Details
    ISSN: 1432-2242
    Keywords: Key words EBN (endosperm balance number) ; Somatic hybrids ; Potato ; Brown rot ; Pseudomonas solanacearum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The wild potato relative Solanum commersonii is reported to carry resistance to bacterial wilt disease caused by Ralstonia solanacearum. To overcome sexual incompatibilites due to differences in ploidy and endosperm balance numbers, somatic hybrids were made that combine the S. tuberosum and S. commersonii genomes. The resulting somatic hybrid plants are vigorous, but their disease resistance level and their fertility was unknown. We therefore tested the S. commersonii and S. tuberosum source material cv Superior, potato cv Atlantic and six somatic hybrid lines for resistance to a virulent strain of R. solanacearum (race 3, biovar 2) at 28°C. As expected, S. commersonii was significantly more wilt-resistant than the cultivated potatoes. In five of the six somatic hybrid lines, disease resistance levels were similar to that of the resistant S. commersonii parent. The resistance level of the sixth somatic hybrid was intermediate, significantly different from both S. commersonii and S. tuberosum. In controlled crosses, the somatic hybrids in this study proved both to be male- and female-fertile and were self-compatible. More importantly, the somatic hybrids can be crossed with S. tuberosum to produce viable seeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051193
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  • 8
    Electronic Resource
    Electronic Resource
    Calorimetric Control of Aluminium Casting Quality (1999)
    Springer
    Journal of thermal analysis and calorimetry 57 (1999), S. 391-400 
    Details
    ISSN: 1572-8943
    Keywords: Al alloys ; casting ; entrained droplet technique ; nucleation ; secondary phase selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Differential scanning calorimetry (DSC) combined with an entrained droplet technique [1] has been successfully used on a series of melt spun alloys with deliberate impurity additions to study the nucleation related aspects of secondary phase selection during solidification of dilute Al alloys. This paper illustrates how DSC is a sensitive tool for determining the effect impurities can have on the nucleation of secondary phases, and hence material properties of these alloys. Stepped cooling/isothermal holding profile DSC has also been used in preliminary investigations of the thermodynamic range of formation of the Al—Fe eutectic phases and their nucleation and growth solidification kinetics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010118700766
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  • 9
    Electronic Resource
    Electronic Resource
    Assessing Religious Faith in Medical Patients: Cross-Validation of the Santa Clara Strength of Religious Faith Questionnaire (1999)
    Springer
    Pastoral psychology 48 (1999), S. 129-141 
    Details
    ISSN: 1573-6679
    Source: Springer Online Journal Archives 1860-2000
    Topics: Theology and Religious Studies
    Notes: Abstract Growing attention has focused on the relationship between religiosity and health outcomes. However, research has been constrained by the limited availability of measures suitable for use with medical patients. This study examined the psychometric properties of the Santa Clara Strength of Religious Faith Questionnaire (SCSORF) in two well-defined samples of medical patients, representing a range of illness severity: 1) 175 women seen at a gynecology clinic; and 2) 104 cancer patients treated at a bone marrow transplantation program. Evidence for convergent validity was demonstrated by moderately high correlations with other measures of religious involvement. Divergent validity was demonstrated by small associations with social desirability. The measure was not strongly associated with demographic background or medical variables. Modest correlations with conceptually-related measures commonly used in health research (e.g., social support, optimism, existential meaning, purpose in life) further supported the divergent validity of the instrument. Results suggest that this may be a useful, concise measure for assessing religious involvement in medical patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022094727122
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  • 10
    Electronic Resource
    Electronic Resource
    Two Fluorescent Markers Identify the Vacuolar System of Schizophyllum commune (1999)
    Springer
    Current microbiology 38 (1999), S. 295-299 
    Details
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Vacuole-mediated proteolysis is important to sustained growth of filamentous wood-decaying fungi such as Schizophyllum commune. Demonstrating that specific proteases are vacuole associated has been difficult in these organisms due to the lack of specific markers for vacuolar compartments. We used 5-(and 6-)-carboxy-2′, 7′-dichlorofluorescein diacetate (carboxy-DCFDA) and a proprietary vacuolar membrane marker for yeast (MDY-64; Molecular Probes) for in situ fluorescent labeling of the vacuoles of S. commune mycelia grown on microscope slides. MDY-64 labels numerous small vesicles in S. commune mycelia in addition to larger vacuolar structures. In contrast, carboxy-DCFDA apparently is taken up by a subset of the MDY-64-labeled vesicles, accumulating primarily in larger vacuoles. Staining of mycelia with carboxy-DCFDA shows a transition from mostly cytoplasmic fluorescence in apical cells with little vacuolar fluorescence to nearly complete sequestration of the stain in vacuoles of older cells. In penultimate cells, both cytoplasm and vacuolar structures fluoresce. Vacuoles stained with carboxy-DCFDA typically were spherical and ranged in size from 0.4 μm to 3.2 μm in diameter with a mean of 1.8 um. Occasionally, in penultimate cells, tubular structures which stained with carboxy-DCFDA were found. ScPrB, a principal enzyme of nitrogen-limitation induced autolysis in S. commune, copurified in sucrose density gradients with carboxy-DCFDA and acid phosphatase, demonstrating its vacuolar localization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00006805
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