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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Intensive care medicine 20 (1994), S. S27 
    ISSN: 1432-1238
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Polymicrobial infections are characterized by the presence of micro-organisms from more than one group of bacteria. Empirical treatment of polymicrobial infections requires an agent active against both anaerobic and aerobic/facultative bacteria. An aminoglycoside used in combination with an anti-anaerobe agent is commonly used to treat polymicrobial infections. However, aminoglycoside nephrotoxicity and treatment failures raise questions about the use of such regimens. Among non-aminoglycoside treatment regimens such as penicillin and cephalosporins, effectiveness has been compromised by bacteria producing extended spectrum β-lactamases. Cefoxitin shows satisfactory results for treatment of intra-abdominal infections. Other studies have shown good results with imipenem, cefotetan and piperacillin used as single agents. Piperacillin/tazobactam, a new combination broad-spectrum antibiotic and potent β-lactamase inhibitor, can be used for the treatment of infections caused by piperacillin-sensitive microorganisms as well as β-lactamase-producing, piperacillin-resistant organisms. This broad-spectrum activity is appropriate for infections traditionally treated empirically by double or triple antibiotic therapy.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Summary Endosulfan residues declined rapidly — within three to five days — in the water of THIODAN treated test rice fields near Pandaan (East Java). Terminal residues in the water amounted to 0.0005–0.0008 ppm. These residues were due to the constant large scale application in this area. It was noted, that fish are able to tolerate short time exposure of endosulfan concentrations 4 times the LC100. In the mud of submerged as well as dried rice fields, only very low residues (1.9 ppm maximum) were found. The increasing sulfate equivalent in the total residue points to decomposition of the chemical. The biocoenosis, which was impaired at the beginning of the test, reappeared after completion of the test.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Calculations are made to determine the contribution of Lorentz-field and Coulomb-field anisotropy in alkali-halide crystals to the photoelastic coefficients p11–p12 and p44 as well as to the piezopolarizability constants K, K′, Kx, Kz, and K0. These calculations are based on Mueller's theory of the photoelastic effect, with data on iron polarizability and photoelastic coefficients. The applicability of Mueller' s theory to the complete series of alkali-halide crystals is analyzed. Criteria are established for the ionicity of bonds in these crystals.
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0022-4731
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Es wird ein halbautomatisches Titriergerät beschrieben, mit dem kleine Mengen CO2 (0,015–5 mg) potentiometrisch mit Ba(OH)2 als Titrier- und Absorptionsmittel bestimmt werden können. Es wird gezeigt, wie die Apparatur zur direkten Bestimmung des Sauerstoffs in organischen Substanzen nach Schütze und Zimmermann und zur Bestimmung von Spuren von gebundenem und freiem CO2 sowie gebundenem C in wäßrigen Lösungen eingesetzt werden kann. Die Resultate einiger Analysenbeispiele sind angegeben.
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  • 7
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A report is given on improvements of the micro-determination of oxygen and on the extension of the application range of the method to fluorine- and phosphor-organic substances. The pyrolysis is performed in a T-shaped quartz tube, in which the carbon contact is arranged vertically. Thus the formation of a passage in the carbon contact is prevented. The pyrolysis tube is heated by a well stabilized combustion furnace. The weighing time is reduced by using a “Cahn” electrobalance in combination with a digital-voltmeter. The injection and deaeration of the sample is performed by means of a sluice. The potentiometric titration of the resulting carbon dioxide provides for continuous operation without blank values. Experiences are given of the composition of the carrier gas and its purification, of blank values, of interferences and their prevention. The pyrolysis of fluorine- and phosphor-organic substances is performed in a nickel tube at a contact temperature of 900°C. Platinum-carbon serves as contact and a mixture of 98% nitrogen and 2% hydrogen as carrier gas. The carrier gas is well purged at room temperature by a BTS-contact. Phosphor-organic substances are mixed for the pyrolysis with a mixture of powdered nickel and silver chloride. Quantitative decomposition of aromatic and aliphatic polycarboxylic acids is achieved by using nickel gauze as an additional pyrolysis contact.
    Notes: Zusammenfassung Es wird über Verbesserungen der Mikro-Sauerstoffbestimmung und die Erweiterung des Anwendungsbereiches der Methode auf fluor- und phosphororganische Substanzen berichtet. Zur Pyrolyse wird ein T-förmiges Quarzrohr verwendet, in dem der Kohlekontakt vertikal angeordnet ist. Eine Gangbildung im Kohlekontakt ist dadurch ausgeschlossen. Das Pyrolyserohr wird mit Hilfe eines neuen Verbrennungsofens beheizt. Die Kontakttemperatur wird durch Stabilisierung der Netzspannung konstant gehalten. Die Einwägezeit konnte durch Einsatz einer „Cahn-Elektrowaage“ in Kombination mit einem Digitalvoltmeter wesentlich verkürzt werden. Die Einführung und Vorspülung der Substanzeinwaage über eine Schleuse und die potentiometrische Titration des bei der Umsetzung entstehenden Kohlendioxids ermöglichen ein kontinuierliches und blindwertfreies Arbeiten. Über Zusammensetzung des Trägergases und seine Reinigung, über Blindwerte und Störungen sowie ihre Beseitigung werden Erfahrungen mitgeteilt. Die Pyrolyse von fluor- und phosphororganischen Substanzen wird in einem Nickelrohr bei 900°C über Platin-Gasruß durchgeführt und als Trägergas ein Gemisch von 98% Stickstoff und 2% Elektrolytwasserstoff, das über einen BTS-Kontakt von Sauerstoffspuren gereinigt wird, verwendet. Phosphororganische Substanzen werden zur Pyrolyse mit Nickelpulver oder Nickelpulver + Silberchlorid gemischt. Die quantitative Umsetzung von aromatischen und aliphatischen Polycarbonsäuren konnte erst durch Verwendung von Nickeldrahtnetz als zusätzlicher Pyrolysekontakt erreicht werden.
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  • 8
    ISSN: 1618-2650
    Keywords: Analyse von Pyrazophos, Triazophos ; Rückstandsanalyse ; miniaturisierte Arbeitsweise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Geräte und Prinzip einer miniaturisierten Arbeitsweise in der Rückstandsanalytik werden beschrieben. Die praktische Anwendung wird am Beispiel der Rückstandsbestimmung von Pyrazophos und Triazophos demonstriert. Diese Mikrotechnik erfordert weniger Zeit, weniger Material (von Bedeutung bei gefährlichen Lösungsmitteln) und eine kleinere Arbeitsfläche als die übliche Makroarbeitsweise.
    Notes: Summary Equipment and principle of a miniaturized mode of working in residue analysis are described and are demonstrated with the example of the residue determination of pyrazophos and triazophos. This micro-technique offers the advantage of requiring less time, less material (in particular of importance for hazardous solvents) and a smaller working area than the usual macro-method.
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  • 9
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird ein Verfahren beschrieben, mit dessen Hilfe es möglich ist, Substanzen unter definierten Bedingungen bezüglich Temperatur, Sauerstoffangebot und Verweilzeit zu verbrennen und die entstehenden Brandgase analytisch zu erfassen. Die Verbrennungsapparatur wurde unter besonderer Berücksichtigung der Erfordernisse für die analytische Probenahme konzipiert. Das Verfahren erlaubt es, die unter definierten reproduzierbaren Verbrennungsbedingungen erzeugten Brandgase zu untersuchen und durch Variation der Randbedingungen ein Gesamtbild der bei einem realen Brand möglicherweise entstehenden Stoffe zu erhalten. In drei voneinander unabhängig arbeitenden Laboratorien wurden mit fünf Modellstoffen gut übereinstimmende Analysenergebnisse erhalten.
    Notes: Summary A process is described that allows substances to be burned under defined conditions, i.e. temperature, oxygen supply and residence time, and the fumes to be analyzed. Special allowance for sampling the fumes was made in designing the combustion apparatus. The method allows the fumes given off under defined and reproducible combustion conditions to be investigated. A complete picture of the substances that might be given off in the event of a real fire can then be obtained by varying the boundary conditions. The analytical results on five model substances in three independent laboratories agreed well with one another.
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  • 10
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Summary In the so-called BIMAS PROJECT area of East Java investigations concerning Thiodan residues were made in the waters of the main waterway Brantas. The samples were taken from the water system towards the end of the main campaign of treatment with the insecticide Thiodan. Rivers, canals, fish ponds in the coastal area and sea water were analysed. It was found that on the average a low Thiodan content resulting from quick degradation of Thiodan existed in the flowing water system. In the fish ponds filled with water from the canal system, the residue values were almost below the detection limit (0.00003 ppm). The water of the Madura Sea contained insignificant residues in the top layer of fresh water near the river deltas. The sea water was free from Thiodan.
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