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  • 1
    Electronic Resource
    Electronic Resource
    Thermophysical properties of the lanthanide sesquisulfides. II. Schottky contributions and magnetic and electronic properties of γ-phase Pr2S3, Tb2S3, and Dy2S3 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 1964-1972 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Heat-capacity measurements by adiabatic equilibrium calorimetry are reported for γ-phase Pr2S3, Tb2S3, and Dy2S3 between 5 and 350 K. Highly purified samples were prepared and their composition verified by chemical analysis. Precision lattice parameters were determined for each compound and are compared with literature values. The total heat capacity has been resolved into lattice, magnetic, and Schottky components by a volumetric approach. The experimental Schottky contributions accord with the calculated curves based on the crystal-field splitting of the 2S+1LJ ground state of the lanthanide ions occupying sites of S4 symmetry in the Th3P4 lattice. The individual crystal-field electronic energy levels have been obtained in part from an analysis of the hot-band data observed in the absorption spectra of Pr2S3, Tb2S3, and Dy2S3, and from a calculated splitting in which the crystal-field parameters Bkm, were determined from a lattice-sum calculation. Molar thermodynamic properties are reported for all three compounds. The entropy at 298.15 K {S0−S0 (7 K)}, is 22.78R, 22.93R, and 23.36R, for γ-phase Pr2S3, Tb2S3, and Dy2S3, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460993
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  • 2
    Electronic Resource
    Electronic Resource
    Thermophysical properties of the lanthanide sesquisulfides. III. Determination of Schottky and lattice heat-capacity contributions of γ-phase Sm2S3 and evaluation of the thermophysical properties of the γ-phase Ln2S3 subset (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 6149-6156 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the experimental heat capacity of γ-phase Sm2S3 and derived thermophysical properties at selected temperatures. The entropy, enthalpy increments, and Gibbs energy function are 21.50R, 3063R⋅K, and 11.23R at 298.15 K. The experimental heat capacity is made up of lattice and electronic (Schottky) contributions. The lattice contribution is determined for all γ-phase lanthanide sesquisulfides (Ln2S3 ) using the Komada/Westrum model. The difference between the experimental heat capacity and the deduced lattice heat capacity is analyzed as the Schottky contribution. Comparisons are made between the calorimetric Schottky contributions and those determined based on crystal-field electronic energy levels of Ln3+ ions in the lattice and between the Schottky contributions obtained from the empirical volumetric priority approach and from the Komada/Westrum theoretical approach. Predictions for the thermophysical properties of γ-phase Eu2S3 and γ-phase Pm2S3 (unavailable for experimental determination) are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462857
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  • 3
    Electronic Resource
    Electronic Resource
    Healing of implant dehiscence defects with without expanded polytetrafluoroethylene membranes: a controlled clinical and histological study and histological study (1994)
    Copenhagen : Munksgaard International Publishers
    Clinical oral implants research 5 (1994), S. 0 
    Details
    ISSN: 1600-0501
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Bone augmentation around implant fixtures using the technique of guided tissue regeneration has been described in a number of reports. The aim of this study was to evaluate bone fill around dehiscence defects at matched defects randomly allocated to test (expanded polytetrafluoroethylene; Gore-Tex) or control treatments within the same patient. Six edentulous subjects were treated with overdentures supported by 2 fixtures ad modum Brinemark. In addition, 2 experimental 7 mm fixtures with nearly identical dehiscence defects on the labial aspect were placed in the anterior part of the mandible. Baseline defect heights ranged from 2.5 to 4.0 mm with 2 to 4 threads exposed. The test fixture dehiscence was covered with a Gore-Tex membrane secured with a cover screw. The experimental fixtures were exposed after 5 months at stage 2 surgery and measurements and photographs repeated. The fixtures were then removed with a trephine and processed for histological evaluation. Regeneration of a hard tissue resembling bone was observed in 4 of 6 cases treated with Gore-Tex, amounting to between 95 and 100% elimination of the dehiscence and total coverage of the threads. However, in one of these cases, histological evaluation showed that it was soft tissue and not bone, and in a further case soft tissue regeneration was apparent both clinically and histologically. In another case there was no significant regeneration at either test or control defects. Although there was a trend for the Gore-Tex treated dehiscences to respond more favourably, the differences in clinical and histological measurements between test and control failed to reach statistical significance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0501.1994.050206.x
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  • 4
    Electronic Resource
    Electronic Resource
    Persistent augmentation of natural-killer- and T-cell-mediated cytotoxicity in peripheral blood mononuclear cells pulsed in vitro with high-dose recombinant interleukin-2 prior to culturing with a low maintenance dose (1994)
    Springer
    Cancer immunology immunotherapy 39 (1994), S. 34-40 
    Details
    ISSN: 1432-0851
    Keywords: Key words: Pulse incubation – Recombinant interleukin-2 – Cell-mediated cytotoxicity – Cytokines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The toxicity of high-dose recombinant interleukin-2 (rIL-2) treatment limits its use in tumour therapies. This paper describes in vitro studies of whether a single, peak rIL-2 dose, followed by low maintenance doses, could enhance the cytotoxic potential of peripheral blood mononuclear cells (PBMC) without inducing a significant sustained release of secondary cytokines, known to contribute to undesirable side-effects of therapy. Pre-pulsing of PBMC with high-dose rIL-2 (16 000 IU/ml for 30 min), followed by low-dose (5 IU/ml) maintenance culturing, was found to induce persistent augmentation of cytotoxic activity towards natural-killer(NK)-sensitive and -insensitive tumour targets, as well as increased T-cell-mediated target cell killing. Under these conditions the level of killing was as high as that achieved by higher maintenance doses (20 – 100 IU/ml). Although not reflected by overexpression of cell surface markers, enhanced activation of cytotoxic capacities by high-dose pre-pulsing remained clearly apparent for at least 12 days of culture. Increased secondary cytokine production (tumour necrosis factor, interleukin-6 and interferon γ) was only evident during the first 24 – 72 h after pulsing, and not at later stages of culturing at the low maintenance dose of 5 IU rIL-2/ml. These results may warrant a human phase-1 B study to investigate the in vivo effect of high-dose prepulsing, followed by low-dose maintenance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01517178
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Persistent augmentation of natural-killer-and T-cell-mediated cytotoxicity in peripheral blood mononuclear cells pulsed in vitro with high-dose recombinant interleukin-2 prior to culturing with a low maintenance dose (1994)
    Springer
    Cancer immunology immunotherapy 39 (1994), S. 34-40 
    Details
    ISSN: 1432-0851
    Keywords: Pulse incubation ; Recombinant interleukin-2 ; Cell-mediated cytotoxicity ; Cytokines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The toxicity of high-dose recombinant interleukin-2 (rIL-2) treatment limits its use in tumour therapies. This paper describes in vitro studies of whether a single, peak rIL-2 dose, followed by low maintenance doses, could enhance the cytotoxic potential of peripheral blood mononuclear cells (PBMC) without inducing a significant sustained release of secondary cytokines, known to contribute to undesirable side-effects of therapy. Pre-pulsing of PBMC with high-dose rIL-2 (16000 IU/ml for 30 min), followed by low-dose (5 IU/ml) maintenance culturing, was found to induce persistent augmentation of cytotoxic activity towards natural-killer(NK)-sensitive and-insensitive tumour targets, as well as increased T-cell-mediated target cell killing. Under these conditions the level of killing was as high as that achieved by higher maintenance doses (20–100 IU/ml). Although not reflected by overexpression of cell surface markers, enhanced activation of cytotoxic capacities by high-dose pre-pulsing remained clearly apparent for at least 12 days of culture. Increased secondary cytokine production (tumour necrosis factor, interleukin-6 and interferon γ) was only evident during the first 24–72 h after pulsing, and not at later stages of culturing at the low maintenance dose of 5 IU rIL-2/ml. These results may warrant a human phase-1 B study to investigate the in vivo effect of high-dose prepulsing, followed by low-dose maintenance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01517178
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    Paper (German National Licenses)
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