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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 38 (1966), S. 1587-1587 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 38 (1966), S. 536-541 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 647-653 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A commercial, power-compensated, differential scanning calorimeter (DSC) has been modified and incorporated into a gas-handling system to improve its performance and to allow its use to accurately measure heats of adsorption on supported metal catalysts. The use of gas flow controllers, needle valves, and appropriate purge gas mixtures minimized base-line perturbations due to uneven flow rates to the sample and references cavities and to changes in thermal conductivity upon introduction of the adsorbate into the purge gas. However, errors in the energy trace were still observed when large differences existed between the thermal conductivities of the adsorbate and the purge gas. These errors can be especially pronounced with processes involving the adsorption or reaction of hydrogen (if Ar is the purge gas, for example), and the severity of the problem has not previously been recognized. However, the use of a purge gas mixture with a thermal conductivity near that of the adsorbate minimized this problem, and employing a DSC block temperature near that of the adsorption temperature further decreased this error. Utilizing He as the purge gas allowed accurate values to be obtained for the enthalpy of Pd hydride formation and for heats of adsorption of H2 on Pt surfaces. The difficulties with CO adsorption were much less severe because its thermal conductivity is much more similar to that of Ar, and Qad values for CO on Pt were more easily obtained. Finally, the error in the energy trace for H2 when Ar was used was proportional to the amount of H2 adsorbed; therefore a correction factor could be obtained which alternatively allowed Ar to be used as a purge gas and provided values in good agreement with those obtained under optimum conditions using He.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 12 (1996), S. 0 
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The aim of this study was to evaluate clinically and radiographically the long-term results of endodontic therapy. A total of 172 mature teeth with periapical radiolucencies with and without symptoms were treated endoclontically using calcium hydroxide paste as the intracanal medicament and a calcium hydroxide containing root canal sealer. In 58 teeth, the dressing-was accidentally or intentionally extruded into the lesions. All cases were followed up for a period of 2–5 years. The teeth in which the dressing was extruded did not show a different healing pattern from the ones treated conventionally. The complete healing rate for all cases was 80.8% while incomplete healing had taken place in 7.6% of the cases.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 12 (1996), S. 0 
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The aim of this study was to observe apical fool surfaces of teeth with chronic periapical lesions. Five premolars and three molars with radiographically demonstrable periapical lesions were extracted and fixed in 2.5% phosphate-buffered glutaraldehyde solution For 9 days. The apical 3-mm portion of 17 roots was removed and prepared for scanning electron microscope. Lacunar resorption zones were frequently observed on the root surfaces. Bacteria and yeast cells were detected in some of the lacunae. Periapical bacterial plaque with a smooth structure was present mostly around the main apical foramen. Cementum-like tissue deposits indicative of repair were seen adjacent to some resorption areas. Clastic cells lightly attached to crater-like depressions with linger-like projections were observed laterally on the specimens. Current research should be focused on new procedures to eliminate extraradicular microrganisms and periapical bacterial plaque in persistent periapical infections.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 11 (1995), S. 0 
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract When a draining lesion is encountered on the skin of the face, an endodontic origin should always be considered in differential diagnosis. Non-surgical endodontic therapy, sometimes complimented by surgery, or extraction are the choices for the treatment of these cases. Three cases of extraoral sinus tract on the chin caused by necrotic pulp of traumatized lowrer anterior teeth are presented. A paste consisting of calcium hydroxide and barium sulfate powder mixed with glycerin was used. Usage of calcium hydroxide paste was advocated for rapid and successful treatment of extraoral lesions communicating with necrotic teeth.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 11 (1995), S. 0 
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The aim of this study was to observe the root canal flora and possible penetration of microorganisms into dentinal tubules in teeth with necrotic pulps. Ten infected maxillary and mandibular molars with periapical lesions were extracted and fixed in 2.5% phosphate-buffered glutaraldehyde solution for nine days. After separation from the crowns, longitudinal grooves were cut in the roots, and they were split into two halves. The specimens were prepared for SEM. The root canals and the dentinal tubules of the fractured dentin were scanned systematically from the cervical to the apical area of the root. Cocci and rods were seen in 6 specimens. Penetration of bacteria into the dentinal tubules ranged from 10 to 150 μm. In 4 specimens, the root canals were heavily invaded by yeasts. The antimicrobial effect of routinely used endodontic disinfectants also on yeasts may be considered in persistent root canal infections.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 127 (1931), S. 523-523 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE theory of radioactive transformation, on the basis of wave-mechanics was initiated by Gamow and Condon and Gurney. The consequences have been worked out in detail by Born1 and Kudar.2 But Heisenberg's objection to the construction of particles out of packets of ...
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 149 (1942), S. 139-140 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN our preliminary report1 on vernalization of mustard (Brassica juncea, Hooker Type 27) it was shown that even seeds previously soaked which remain unsplit during the period of chilling are vernalized. Though the degree of vernalization induced by the same dose of chilling is ...
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 140 (1937), S. 1102-1102 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT has been shown by Khastgir and Das-Gupta1 that crystals like carborundum, silicon and zincite, which have no centres of symmetry, give volume-rectification when placed between mercury electrodes ; whereas with symmetrical crystals, for example, galena and iron pyrites, they ...
    Type of Medium: Electronic Resource
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