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  • 11
    ISSN: 1437-1596
    Keywords: Phencyclidine ; Pethidine ; Gas chromatography ; Surface ionization detection ; Sep-Pak C18 cartridges
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Notes: Abstract Phencyclidine (PCP) can be detected in body fluids with very high sensitivity by gas chromatography (GC) with surface ionization detection (SID) using pethidine as internal standard. PCP was extracted with Sep-Pak C18 cartridges from whole blood and urine samples, which gave clean extracts. The calibration curve for spiked whole blood was linear in the range 1.25–20 ng/ml. The detection limit of PCP was approximately 15 pg on-column (0.75 ng/ml sample), which was much lower than by GC-nitrogen phosphorus detection. The recovery of PCP and pethidine from spiked whole blood or urine samples was above 85%. This method seems very useful for the determination of PCP in forensic and clinical toxicology.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 717-720 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Surface titanium oxide (TiO2) films were fabricated on implant titanium (Ti) at lowtemperatures by electron-cyclotron-resonance (ECR) plasma oxidation. The relationship amongthe oxidization conditions, crystal structure, morphology and osteoconductive property wereinvestigated. Although crystallized TiO2 film was not prepared by thermal oxidation at 300°C,crystallized rutile-type TiO2 film was formed by ECR plasma oxidation at 300°C. Roughmorphology was observed in the substrate surface oxidized by ECR plasma. Mixtures ofoctacalcium phosphate (OCP) and dicalcium phosphate dihydrate (DCPD) were observed aftercalcification. The XRD peak intensities of the OCP and DCPD formed on the ECR plasmaoxidized Ti were larger than those of calcified on the thermal oxidized Ti. ECR plasmaoxidation at low temperature would induce osteoconductive calcium phosphate on implant Ti
    Type of Medium: Electronic Resource
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  • 13
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Our previous studies showed that synthetic octacalcium phosphate (OCP) enhances boneregeneration more than hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP). Also, a syntheticbone substitute constructed of synthetic octacalcium phosphate (OCP) and porcine atelocollagensponge (OCP/Col) showed stable bone regeneration. The present study was designed to investigatethe difference of bone regeneration by OCP/Col and other calcium phosphate-collagen composites.OCP/Col, β-TCP$-collagen% composite (β-TCP/Col), or HA$-collagen% composite (HA/Col) spongewas prepared from pepsin-digested atelocollagen isolated from the porcine dermis and OCP, β-TCP,or HA granules, respectively. A standardized critical-sized defect was made in the rat calvarium, andvarious calcium phosphate-collagen composites were implanted into the defect. The rats were fixedat four weeks after implantation and radiographic and histological examinations were performed byundecalcified cross sections of implants. Radiographic examination showed that uniform radiopaquemasses were observed in the created defects treated with OCP/Col, whereas granulous and foggyradiopacity was observed in β-TCP/Col and HA/Col. Histological examination showed that newlyformed bone was observed in the reticulum of OCP/Col and around the implanted OCP. Theregenerated bone by β-TCP/Col or HA/Col seemed to be less than that by OCP/Col and would not tobe nucleated by the granules of β-TCP or HA. The present study indicated that bone regeneration byOCP/Col was different from those of β-TCP/Col and HA/Col. Application of OCP/Col would beexpected for clinical use in the future
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 993-996 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The present study was designed to investigate the mechanism of in vivo conversion fromsynthetic octacalcium phosphate (OCP) into hydroxyapatite (HA) at ultrastructural level, where theimplanted OCP is enhancing bone regeneration in mouse calvarial bone defect. OCP granules wereimplanted into the subperiosteal area of the calvaria of 7-week-old BALB/c mice for 3 weeks.Transmission electron microscopy of undecalcified frontal sections, obtained from the acrylicresin-embedded skull specimens showed that the bone crystals in newly formed bone directly bondedto the OCP particles implanted. The morphological characteristic of original plate-like OCP particleswas remained unchanged even after the implantation, whereas a number of de novo nano-particleswere also directly formed onto the plate-like OCP particles. Some of OCP particles were linked withother OCP particles through these nano-particles. The results suggest that the OCP-apatite conversion,involving the enhanced bone regeneration, advances via topotaxial conversion without changing theoriginal OCP morphology, accompanied by solution-mediated de novo nano-apatite formation, in thevicinity of the implanted OCP particles
    Type of Medium: Electronic Resource
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  • 15
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The present study was designed to investigate whether bone morphogenetic protein-2(BMP-2) adsorbed onto octacalcium phosphate (OCP) and hydroxyapatite (HA) surfaces influencesosteoblastic cell differentiation. Osteoblastic cell line, UAMS32, were cultured on plastic plate thatwas coated of synthetic OCP and HA. BMP-2 was pre-adsorbed on these calcium phosphates at 4°Cor room temperature for 24h. The cells more proliferated on the BMP-2 pre-adsorbed OCP and HAthan that of the controls (OCP and HA coating without BMP-2). ALP activities were higher on HAthan on OCP when BMP-2 were pre-adsorbed at 4°C than at room temperature. The results suggestthat pre-adsorption of BMP-2 in different temperature affects osteoblastic cell differentiation, mostprobably through different adsorption state of BMP-2 on this calcium phosphate
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 31-34 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Our previous studies suggested that synthetic octacalcium phosphate (OCP) enhances boneregeneration more than hydroxyapatite (HA). However, the molecular mechanisms to induceosteogenic phenotype in osteoblast by OCP have not been identified. OCP tended to convert into anapatite structure in vivo and in vitro, and its process was accompanied by calcium consumption fromthe surrounding solution and the release of phosphate ions into the solution at a physiologicalcondition. The present study was designed to investigate whether the dissolution of ionic products ofOCP affects on proliferation and differentiation of mouse bone marrow stromal ST-2 cells in vitro.The number of cells treated with OCP-conditioned medium was slightly decreased in comparison tothat of control at day 7. On the other hand, the level of alkaline phosphatase activity increased inOCP-conditioned medium. These results demonstrated that OCP is capable of inducing osteoblasticcell differentiation in ST-2 cells
    Type of Medium: Electronic Resource
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  • 17
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The surface oxide films were prepared by Electron Cyclotron Resonance (ECR)plasma oxidation on Ti substrates. Octacalcium phosphate (OCP) and dicalcium phosphatedihydrate (DCPD) peaks were formed after calcification by supersaturated calcium andphosphate solutions. Calcification ability was enhanced with increasing the oxidation time andthe total pressure of ECR plasma treatment during oxidation. The results demonstrated that thecalcium phosphate nucleation and the deposition can be controlled by various ECR plasmaconditions
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 1253-1256 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Bone regeneration by calcium phosphates has been known to be intricately dependent onmaterial properties or implanted milieu of host animals, such as site and species. Critical sizedcalvarial defects of mouse were recently used as the model for investigating bone regeneration abilityand the mechanisms. The purpose of the present study is to investigate whether the critical sizedmouse calvarial defects can be utilized to examine bone regeneration with synthetic octacalciumphosphate (OCP). OCP , prepared by wet synthesis methods, was sieved 0.3 ~ 0.5 mm in diameter andused for the animal experiment. At 14 days after surgery, histological examination showed thatimplantation of OCP grafted defects significantly enhanced bone formation compared with thecontrol defect. OCP tended to convert to hydroxyapatite with time. The tartrate-resistant acidphosphatase (TRAP) positive osteoclastic cells were observed around the OCP particles. The resultssuggest that the mouse critical sized calvarial bone defects are useful model to investigate the boneformation by the OCP implantation
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    International journal of legal medicine 103 (1990), S. 599-607 
    ISSN: 1437-1596
    Keywords: Diquat, determination by ESR ; Paraquat ; Diquat, Nachweis durch ESR-Methode ; Paraquat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung Eine ESR-Methode, bereits für die quantitative Analyse von Paraquat entwickelt, wird zur Analytik von Diquat in Blut, Serum, Urin, Gewebshomogenisaten und verschiedenen Getränkeproben ohne besondere Reinigung des Materials herangezogen. Das mit Ascorbinsäure gewonnene Diquatradikal war im alkalischen Milieu stabiler als das üblicherweise eingesetzte und mit Natriumdithionit hergestellte Radikal. Der Abfall der Radikalkonzentration in n-Hexanlösungen lag bei weniger als 5% nach 60 Minuten in weiten Bereichen der Ascorbinsäurekonzentration. Beispielsweise lagen in 0,2 N-NaOH noch 85% nach 24 Stunden vor. Die Nachweisgrenze beträgt 0,3 μg/ml und das benötigte Probenvolumen 0,1 ml. Liegen sowohl Diquat als auch Paraquat in der Probe vor, so wird empfohlen, Diquat durch Extraktion mit 1-Butanol vor der ESR-Messung abzutrennen, da beide Verbindungen in Radikale überführt werden.
    Notes: Summary An electron spin resonance (ESR) method already in use for the quantitative analysis of paraquat was applied to the analysis of diquat in blood, serum, urine, tissue homogenates and several drinks without purification of the samples. The diquat radical produced with ascorbic acid at alkaline pH was much more stable than that produced with the commonly used sodium dithionite. Radical decay in solutions covered withn-hexane was less than 5% after 60 min over a wide range of ascorbic acid concentrations. In 0.2 N NaOH solution 85% of the radicals was present even after 24h. The limit of detection was 0.3 μg/ml and the required amount of sample was 0.1ml. When both diquat and paraquat were present in a sample the diquat was first extracted with 1-butanol prior to the ESR measurement, because both species were converted to the radicals.
    Type of Medium: Electronic Resource
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  • 20
    ISSN: 1436-2813
    Keywords: collateral artery bypass ; Buerger's disease ; sural artery ; reoperative vascular surgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A 25-year-old man was admitted to our hospital for treatment of a painful ulcer on his left fourth toe, 9 years after undergoing lumbar sympathectomy and 4 years after undergoing bypass, both of which had been unsuccessful. Angiography demonstrated diffuse arterial occlusion in the lower extremities except for a persistent sciatic artery and a sural artery, which was the main collateral. Thus, reversed bifurcated saphenous vein bypass from the sciatic artery to the sural artery and the posterior tibial artery was performed utilizing Esmarch's rubber bandage as a substitute for a vascular clamp to control bleeding intraoperatively. The ulcer healed promptly and the patient was discharged symptom-free 1 month postoperatively. This case report dmonstrates the advantage of performing collateral arterial bypass and illustrates some of the technical challenges associated with this procedure.
    Type of Medium: Electronic Resource
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