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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 10948-10957 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present the results of femtosecond optical heterodyn detected optical Kerr effect (OHD-OKE) spectroscopy and low frequency Raman scattering spectroscopy for three thiophene homologues (C4H4X, X=O, S, and Se). The observed OHD-OKE transients were analyzed both in time and frequency domains. Fourier transformed OHD-OKE data were directly compared with the corresponding spontaneous Raman scattering spectra. The reorientation lifetimes for furan (O), thiophene (S) and selenophene (Se) were determined to be 0.9, 2.0 and 3.2 ps, respectively, and were fairly explained in terms of the Stokes-Einstein-Debye relation. Their subpicosecond dynamics was analyzed with an antisymmetric Gaussian function and a skewed function developed by Bucaro and Litoviz, which gave good curve fits to observed data. Librational and translational dynamics of the molecules was discussed in terms of microscopic environments formed by neighboring molecules and the results of intermolecular interaction energy calculations by an ab initio molecular orbital method. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1600-0501
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study aimed to investigate the effect of hyperbaric oxygen (HBO) therapy on the tissue reactions to commercially pure (c.p.) titanium implants placed in free autogenous bone graft by a 1-stage procedure. Eighty c.p. titanium implants were placed in the bone grafted from iliac crest to bilateral mandible of 40 Japanese white rabbits without tapping. Twenty rabbits underwent daily a HBO treatment for 60 min under 2.4 ATA during 20 consecutive days and the other untreated 20 rabbits served as controls. The implants with surrounding bone tissue were retrieved 20, 30, 60, 90 and 120 days after surgery, fixated, dehydrated and embedded in resin. About 20 μm thick ground sections were prepared prior to microscopical observations. The bone area and the bone-to-implant contact inside the threads were calculated separately in the grafted bone and in the host bone for each implant. After 30 and up to 120 days, the HBO treated group showed more bone-to-implant contacts in the grafted bone as compared to the non-HBO treated group. In the host bone there were no differences observed between HBO and non-HBO treated groups. This study indicated that HBO treatment was beneficial for the tissue incorporation of c.p. titanium implants when placed immediately in free autogenous bone grafts.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1437-7772
    Keywords: oral cancer ; cisplatin ; pirarubicin ; intra-arterial infusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background A comparison of chemotherapy with PP (cisplatin, CDDP; and peplomycin, PEP) and TPP (4′-O-tetrahydropyranyladriamycin: THP-ADM, CDDP and PEP) in the treatment of oral cancer. Methods This study included 159 out of 199 patients who had visited the collaborating institutions' hospitals, and who had been registered in the Examination Meeting of Chemotherapy for Oral Cancer during the 2-year period from June 1990 to May 1992. Ninety-seven patients underwent PP therapy and 62 underwent TPP therapy. In PP intravenous infusion therapy, 60–80 mg of CDDP per m2 was administered on day 1, followed by infusion of 5–7.5 mg of PEP per m2 from day 2 until day 6. In the PP intra-arterial infusion therapy, in which the drugs were infused in a retrograde fashion into the superficial temporal artery, 50–70 mg of CDDP per m2 was infused on day 1, followed by infusion of 5 mg of PEP per m2 from day 2 until day 6. In both the intravenous and intra-arterial TPP therapy regimens, 20 mg of THP-ADM per m2 was infused on day 1, followed by infusion of 50 mg of CDDP per m2 on day 2, and infusion of 5 mg of PEP per m2 from day 3 until day 7. Results The response rate of TPP therapy was 64.5%, which was not significantly different from the 53.6% obtained with PP therapy. However, the complete response (CR) rate with TPP therapy was 22.6%, significantly higher than the 9.3% with PP therapy. The response rate of TPP intra-arterial infusion therapy was particularly high (92.3%), and significantly higher than that of PP therapy. The response rate of TPP intra-arterial infusion therapy was very high (100.0%) in stage I and II patients and in primary cancers of the tongue, gingiva, buccal mucosa, and hard palate. The toxicity of TPP and PP therapies resulted in a high incidence of nausea/vomiting and anorexia. Skin disorders and epilation were observed at high rates with TPP therapy, and incidences were particularly high (100.0%) in the TPP intra-arterial infusion therapy group. The incidence of leukopenia was high in patients treated with TPP therapy but was not severe. Conclusion The results of this study suggest that TPP therapy is more effective than PP therapy in the treatment of oral cavity cancer. Although TPP therapy was associated with skin abnormalities, alopecia, and leukopenia as side effects, there was no influence on subsequent treatment. TPP intra-arterial infusion therapy appears promising in the treatment of oral cancer.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0020-7608
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Static second hyperpolarizabilities were calculated for molecules including tetrahydrofuran homologs by ab initio molecular orbital methods at the Hartree-Fock and various correlation levels. Substitution of the heteroatom with a heavier atom is found to be effective for increase of the second hyperpolarizability of these homologs. Comparison between the present results and previous results for furan homologs shows that π-conjugation is not effective for the increase of second hyperpolarizability of the molecules when the heteroatom is heavier.   © 1998 John Wiley & Sons, Inc. Int J Quant Chem 70: 737-743, 1998
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0003-276X
    Keywords: Type VI collagen ; Mouse ; Masseter tendon ; Electron microscopy ; ATP treatment ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Background and Methods: The association of masseter tendon type VI collagen with other extracellular matrix (ECM) components was examined from osseous attachment to myotendinous junction by immunohistochemistry and transmission electron microscopy with ATP treatment and enzyme digestion.Results: In the tendon proper, fibrocytes extended their processes among bundles of striated collagen fibrils and associated with adjacent cells through amorphous materials, thus forming a three-dimensional network. The amorphous or filamentous material was observed around the fibrocyte cell body and along the cell processes, where the localization of type VI collagen was confirmed by immunohistochemistry using anti-type VI collagen antibody. After treatment with 20 mM adenosine 5′-triphosphate (ATP), 100 nm periodic fibrils, an aggregated form of type VI collagen, were formed in the place where amorphous or filamentous material was present before the treatment. In myotendinous junction, the ATP-aggregated periodic fibrils were observed to associate with the external lamina of the muscle cells as well as among junctional tendon collagen fibrils. In the tendonbone boundary, ATP-aggregated periodic fibrils were observed around fibrocartilage-like cells in the uncalcifying area but not in the calcification front. Prolonged ATP treatment or hyaluronidase predigestion caused the formation of type VI collagen periodic fibrils in the area near the calcified matrix.Conclusions: The distribution of type VI collagen in mouse masseter tendon is different in different anatomical position. This may reflect the different functional demand for this collagen. © 1995 Wiley-Liss, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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