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  • Springer  (44)
  • 1995-1999  (44)
  • 1955-1959
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Keywords
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  • 1
    Electronic Resource
    Electronic Resource
    Oxidation of organic impurities in the recycle and reclaim loops of ultra-pure water plants (1998)
    Springer
    Clean products and processes 1 (1998), S. 31-38 
    Details
    ISSN: 1436-722X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract  The oxidation of trace organic impurities in ultrapure water by ultraviolet light (UV), ozone, and the combination of UV/ozone is investigated. The emphasis is on the development of a global model to simulate the process that take place in the typical oxidation reactors used in ultrapure water plants. The study also focuses on reaction mechanism for oxidation of multi-component organic impurities. Eighteen organic model compounds are chosen as representative contaminants. The results demonstrate and confirm a significant synergistic effect between UV and ozone oxidation. A mechanism for the synergistic oxidation of organic impurities is proposed and validated with experimental data. The combination of the reaction and the reactor models is used to determine the fundamental kinetic parameters involved in the three oxidation processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100980050005
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  • 2
    Electronic Resource
    Electronic Resource
    Reduction theorem of the codimension of minimal generic submanifolds in a complex projective space (1995)
    Springer
    Geometriae dedicata 54 (1995), S. 137-143 
    Details
    ISSN: 1572-9168
    Keywords: 32C15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We study compact minimal generic submanifolds of a complex projective space with flat normal connection and prove a reduction theorem of codimension under the condition on the Ricci tensor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01263528
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  • 3
    Electronic Resource
    Electronic Resource
    Inhibitory effect of bacterial ubiquinones on the settling of barnacle,Balanus amphitrite (1995)
    Springer
    Cellular and molecular life sciences 51 (1995), S. 153-155 
    Details
    ISSN: 1420-9071
    Keywords: Settlement inhibitor ; barnacle ; ubiquinone ; sponge ; Halichondria okadai ; sponge associated bacteria ; Alteromonas sp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In an attempt to clarify the influence of marine bacteria on the settling of fouling invertebrate larvae, we screened for inhibitors, produced by marine bacteria, of settling by cyprids of the barnacle,Balamus amphitrite. We found that the culture broth ofAlteromonas sp. strain number KK10304, which was associated with the marine sponge,Halichondria okadai, effectively inhibited settling of the cyprids. Bioassay-guided isolation indicated ubiquinone-8 (1) as an effective inhibitor of cyprid settling. As ubiquinones are widely distributed in bacteria, several related compounds were also tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01929360
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  • 4
    Electronic Resource
    Electronic Resource
    Enhancement of NO-elimination activity of Co-silicate catalyst by high-temperature calcination in steam-containing air (1998)
    Springer
    Catalysis letters 52 (1998), S. 139-144 
    Details
    ISSN: 1572-879X
    Keywords: Co-silicate ; high-temperature calcination ; steam ; supported Co catalyst ; non-framework Co ; NO elimination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract H–Co-silicate having an MFI structure (CoMFI), calcined in steam-containing air at 800°C (CoMFI-800S), was characterized by XRD and diffuse reflectance electron absorption (EA). The calcination educed some of the Co ions from the CoMFI framework to make small clusters nearby. The CoMFI-800S performance in NO elimination in the presence of excess O2 was compared with that of Co supported on siliceous MFI zeolite ([Co]SiMFI), Co supported on H–Co-silicate ([Co]CoMFI), and a physical mixture of CoMFI and [Co]SiMFI (Co+[Co]). The educed Co ions enhanced NO elimination due to the uniform and isolated dispersion of oxidized Co clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019096125665
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  • 5
    Electronic Resource
    Electronic Resource
    Reconstruction of Extensive Long-Bone Defects in Sheep Using Porous Hydroxyapatite Sponges (1999)
    Springer
    Calcified tissue international 64 (1999), S. 83-90 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Hydroxyapatite — Ceramics — Bone reconstruction — Bone repair — Biomaterials — Orthopedic surgery.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. The capacity of hydroxyapatite (HA) implants to support large defect repair in weight-bearing long bones of large size animals was investigated. Diaphyseal resections 3.5 cm of the tibia were performed in five adult sheep. They were substituted with HA macroporous ceramic cylinders anatomically shaped, and an external fixator was assembled. The sheep were sacrificed at 20, 40, 60, 120, and 270 days after surgery, respectively. Histology and micro X-ray study of resected implants and adjacent tissues showed proper integration of ceramic with newly formed periosteal bone as early as 20 days after surgery. In one sheep, the external fixator was removed 5 months after surgery. The animal gained the ability to walk with no functional impairment until it was sacrificed 4 months later. At this time, extensive integration of ceramic with bone was detected radiographically and confirmed by a morphological study of the resected sample. Our data indicate that large defects in a weight-bearing long bone can be repaired to the extent necessary for full functional recovery in large animals. These data set the stage for further intervention on material properties as well as for preliminary attempts to use ceramic prostheses for reconstruction of large bone defects in humans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900583
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  • 6
    Electronic Resource
    Electronic Resource
    The effects of the glucocorticoid, dexamethasone, on the development of the Drosophila embryo (1995)
    Springer
    Development genes and evolution 204 (1995), S. 359-368 
    Details
    ISSN: 1432-041X
    Keywords: Drosophila ; Steroids ; Glucocorticoids ; Embryogenesis ; Amnioserosa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have investigated the effects of the glucocorticoid, dexamethasone, and five structural analogs on Drosophila development in an effort to identify steroid ligands that may play a role in the embryogenesis of this organism. Embryos were exposed to glucocorticoids either by direct culture in supplemented medium, or by examining embryos from adult flies raised on supplemented fly food. After exposure, embryos were examined for developmental defects. At a morphological level, exposure to dexamethasone disrupts the dorsolateral folding of the amnioserosa during germ band extension. In addition, germ band retraction and dorsal closure is also disrupted. The phenocritical period of these effects is within the first 4 h of embryogenesis. This response is dosage sensitive, with embryos responding to concentrations of dexamethasone ranging from 10−6 to 10−3M. Furthermore, glucocorticoids which are closely related structural analogs of dexamethasone also disrupt germ band retraction and dorsal closure, while other tested steroids had no effect on embryonic development. At a molecular level, expression of the gene, Krüppel, is absent from the amnioserosa of dexamethasone-treated embryos. The cuticular phenocopy resulting from exposure to dexamethasone and related glucocorticoids is morphologically similar to the mutant phenotype associated with four genes required for germ band retraction, namely hindsight, serpent, tail-up and u-shaped. The results of this study represent the first association of a glucocorticoid with dose, stage and tissue specific effects on Drosophila development at both morphological and molecular levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00360481
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  • 7
    Electronic Resource
    Electronic Resource
    Pure nuclear resonant scattering of synchrotron radiation by a multilayer structure: Theoretical analysis for 169Tm (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 1-11 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The possibility of observing pure nuclear resonant scattering of synchrotron radiation by a multilayer structure containing the 169Tm isotope is analyzed theoretically. The main problem is the need to suppress the enormous background of radiation scattered by electrons. Two methods for the destructive interference of a synchrotron radiation beam in reflection at grazing incidence by a layered system containing Tm nuclei in one of the layers are considered, and their efficiency as applied to the conditions of third-generation synchrotron radiation sources, such as in the European Synchrotron Radiation Facility (ESRF), is calculated. An electron scattering suppression efficiency parameter is formulated as the ratio of the integrated nuclear scattering intensity (with a time delay) to the total prompt electron scattering intensity in assigned ranges of angles and energies. In the first method thin films of a special type on a substrate, viz., GIAR films, are used. In the second method a new effect, which is termed the Bragg antipeak effect and involves the destructive interference of a wave that is Bragg-diffracted in a multilayer superlattice and a wave reflected on the upper boundary of the sample, is employed. The physical properties of the Bragg antipeak effect are considered, and it is found that its efficiency is sufficient for practical use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558623
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  • 8
    Electronic Resource
    Electronic Resource
    Involvement of Insulin-Like Growth Factor I in Development of Ossification of the Posterior Longitudinal Ligament of the Spine (1998)
    Springer
    Calcified tissue international 62 (1998), S. 158-165 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Ossification — Posterior longitudinal ligament — Insulin-like growth factor I — Ligament cell — Immunohistochemistry — Osteogenesis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. In order to investigate the pathogenesis of ossification of the posterior longitudinal ligament (OPLL) of the spine, we examined the distribution of insulin-like growth factor I (IGF-I) in the posterior longitudinal ligaments of OPLL patients, and analyzed the effects of IGF-I on the cultured spinal ligament cells. For that purpose we established eight varieties of OPLL and non-OPLL cell lines obtained from spinal ligaments of corresponding patients, respectively. In contrast to non-OPLL cases, all the OPLL cases were histologically shown to contain round-shaped cartilage-like cells in the transitional region from preossifying to ossifying ligaments, and these cells were strongly stained with an antibody for IGF-I. In the vicinity of preossifying cartilaginous tissues, ligament cells also had a rod-like appearance and were positive for IGF-I immunohistochemically. The effects of IGF-I on cultured spinal ligament cells were assayed by alkaline phosphatase (AP) activity, DNA synthesis, and the amounts of collagen produced. The number of OPLL cell lines that increased AP activity, responding to IGF-I irrespective of 1,25(OH)2D3, was significantly larger than that of non-OPLL cell lines, although IGF-I stimulated DNA and procollagen type I carboxyl-terminal peptide synthesis in most of both OPLL and non-OPLL cell lines. These data demonstrate the dominant expression of IGF-I in the posterior longitudinal ligaments of OPLL patients, and suggest that IGF-I preferentially induces osteogenic differentiation in OPLL cells rather than in non-OPLL cells. IGF-I, therefore, may be involved in the local ossification process of spinal ligaments observed in OPLL patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900410
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  • 9
    Electronic Resource
    Electronic Resource
    Bone Morphogenetic Protein-2 Stimulates Differentiation of Cultured Spinal Ligament Cells from Patients with Ossification of the Posterior Longitudinal Ligament (1997)
    Springer
    Calcified tissue international 60 (1997), S. 291 -296 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Ossification — Posterior longitudinal ligament — Bone morphogenetic protein — Ligament cell — Alkaline phosphatase — Osteogenesis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Ossification of the posterior longitudinal ligament (OPLL) of the spine is characterized by heterotopic bone formation occurring in spinal ligament, causing severe compression myelopathy. In order to investigate the mechanism of OPLL development, we isolated spinal ligament cells from OPLL patients as well as non-OPLL patients, and established 10 OPLL cell lines and 7 non-OPLL cell lines, respectively. We analyzed the effects of bone morphogenetic protein-2 (BMP-2) on these cells with respect to alkaline phosphatase (AP) activity, DNA synthesis, and collagen production. BMP-2 caused a significant increase of AP activity in 4 OPLL cell lines, whereas the activity did not change in any non-OPLL cells. Among OPLL cells, BMP-2 stimulated DNA synthesis in four cell lines and procollagen type I carboxyl-terminal peptide (PICP) synthesis in five cell lines. Some non-OPLL cells also responded to BMP-2, as there was an increase of DNA synthesis in three cell lines and PICP synthesis in one cell line. These data collectively indicate that BMP-2 preferentially induces osteogenic differentiation in OPLL cells rather than in non-OPLL cells. OPLL cells, therefore, exhibit a different response to BMP-2 than non-OPLL cells, suggesting that the expression of BMP receptor(s) and/or the signal transduction initiated by BMP-2 in the spinal ligament cells of OPLL patients somewhat deviate from those in normal spinal ligament cells. Such abnormal characteristics of OPLL cells as described here provide some clues to the clarification of the pathogenesis of OPLL.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900231
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  • 10
    Electronic Resource
    Electronic Resource
    Ab Initio studies on the rotational equilibria of 2-substituted furan and thiophene carbonyl derivatives (1996)
    Springer
    Theoretical chemistry accounts 93 (1996), S. 199-210 
    Details
    ISSN: 1432-2234
    Keywords: Rotational isomer ; SCRF ; Furan ; Thiophine ; Carbonyl derivatives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The relative stabilities of syn- and anti-isomers of 2-substituted furan and thiophene carbonyl derivatives are investigated by theab initio MO method. The energy differences between the rotamers are 1–3 kcal mol−1 but the barriers to rotation are ca. 10 kcal mol−1 so that free rotational mode is predicted to be a rather difficult process. Application of the self-consistent reaction field (SCRF) method to account for the solvent effect indicates that the isomer with a higher dipole moment (syn) is favored in solution. An electron withdrawing 2-substituent favors syn-isomers for furan carbonyls in contrast to thiophene carbonyls for which anti-isomers are favored. These trends are ascribable to a decrease in electrostatic repulsive and attractive interactions, respectively, in the syn forms of furan and thiophene carbonyls. Contribution of non-bonded repulsive interaction in the anti-isomer is important for the relative stability of the syn-isomer of furan carbonyl derivative. Solvent effects due to higher dielectric continuum are small on the absolute values of energy differences but can reverse the order of stability of the two isomers due to a greater stability acquired by an isomer (syn) with higher dipole moment in solution. The major factor determining stability, or instability, of syn-isomer is a repulsive electrostatic interaction between the two oxygen atoms for furan carbonyls and an attractive electrostatic interaction between the sulfur and oxygen atoms for thiophene carbonyls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01113417
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