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  • 1
    Electronic Resource
    Electronic Resource
    Repetitive laser desorption mass spectrometry for nonvolatile organic compounds (1980)
    s.l. : American Chemical Society
    Analytical chemistry 52 (1980), S. 1803-1807 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac50062a006
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  • 2
    Electronic Resource
    Electronic Resource
    Counting metal oxide monolayers on a metal surface using plasma desorption mass spectrometry (1991)
    s.l. : American Chemical Society
    Analytical chemistry 63 (1991), S. 2352-2357 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00020a028
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  • 3
    Electronic Resource
    Electronic Resource
    Haemodilution tolerance in patients with mitral regurgitation (1998)
    Oxford : Blackwell Science Ltd, UK
    Anaesthesia 53 (1998), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Haemodynamic parameters and oxygen consumption were determined in 20 patients with mitral regurgitation before and after a 12 mlkg−1 isovolaemic exchange of blood for 6% hydroxyethyl starch. During haemodilution, mean (SEM) haemoglobin concentration decreased from 13.0 (0.4) to 10.3 (0.4) gdl−1 (p = 0.001). With cardiac filling pressures maintained at predilution levels, cardiac index increased from 1.84 (0.08) to 1.94 (0.08) l.min−1.m−2 (p = 0.025) while systemic vascular resistance decreased from 1556 (86) to 1425 (83) dynescm−5 (p = 0.002) and oxygen extraction increased from 31.7 (1.1) to 37.3 (1.4)% (p = 0.001) resulting in an unchanged oxygen consumption. The haemodynamic response to haemodilution was not affected by the patients' cardiac rhythm, i.e. whether it was sinus rhythm or atrial fibrillation. In conclusion, isovolaemic haemodilution to a haemoglobin of 10.3 gdl−1 is well tolerated in patients with mitral regurgitation. Compensatory mechanisms include both an increase in cardiac index and an increase in oxygen extraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1998.00272.x
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  • 4
    Electronic Resource
    Electronic Resource
    Transoesophageal echocardiography is unreliable for cardiac output assessment after cardiac surgery compared with thermodilution (2004)
    Oxford, UK : Blackwell Science Ltd
    Anaesthesia 59 (2004), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This randomised, single-blind, double-control study compared and established prospectively the best transoesophageal echocardiography methods for determining cardiac output in patients after cardiac surgery. Thirty patients undergoing coronary artery bypass grafting were included. Measurements were taken postoperatively, after stabilisation in the intensive care unit. Cardiac output was determined by transoesophageal echocardiography in randomised order through the aortic, mitral, and pulmonary valves, right and left ventricular outflow tracts, transgastric surface areas of the left ventricle and left ventricle two-dimensional volumes (Simpson's rules). ‘Eyeball guessing’ was done off-line. The best results were transaortic measurements using the triangular shape assumption of valve opening, but some values deviated considerably, and none of these approaches reached the limit of agreement set at 30% when compared to thermodilution. Eyeball guessing was comparable to the best transoesophageal echocardiography measurements. We conclude that transoesophageal echocardiography is an unreliable tool for determination of cardiac output in intensive care after cardiac surgery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.2004.03928.x
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  • 5
    Electronic Resource
    Electronic Resource
    Cardiac output measurement by pulse dye densitometry in cardiac surgery (2005)
    Oxford, UK : Blackwell Science Ltd
    Anaesthesia 60 (2005), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The aim of this study was to compare the accuracy of pulse dye densitometry with that of bolus thermodilution cardiac output measurement in patients before and after elective coronary artery bypass grafting. Twenty-eight patients were studied. Agreement between mean thermodilution and pulse dye densitometry cardiac output values was assessed by Bland-Altman analysis. Preoperative median [range] cardiac output was 3.87 [2.37–6.0] l.min−1 by thermodilution, and 3.11 [1.7–5.45] l.min−1 by pulse dye densitometry using indocyanine green 5 mg. Pulse dye densitometry underestimated cardiac output (mean bias − 0.42 l.min−1); the limits of agreement were ± 1.91 l.min−1, and mean error was 50.3%, indicating low precision. Preoperative median [range] cardiac output was 3.85 [2.2–6.0] l.min−1 for bolus thermodilution cardiac output and 4.2 [2.0–7.2] l.min−1 for pulse dye densitometry using indocyanine green 20 mg. Mean bias was + 0.566 l.min−1, the limits of agreement were ± 2.51 l.min−1 and mean error was 60.9%. Postoperative cardiac output data were not analysed because pulse dye densitometry signals were low or absent in 〉 50% of the patients. We conclude that pulse dye densitometry using indocyanine green 5 mg or 20 mg is inaccurate in anaesthetised patients before coronary artery bypass surgery and cannot be used after surgery because of a high incidence of low pulse dye densitometry signal amplitudes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.2005.04296.x
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  • 6
    Electronic Resource
    Electronic Resource
    Die Extraktion von Uran(IV) aus wäßrig-organischen Salpetersäurelösungen mit dem Nitrat des sekundären Amins Amberlite LA-1 (1973)
    Springer
    Monatshefte für Chemie 104 (1973), S. 1560-1569 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The distribution of U(IV) between methanolic, ethanolic and acetonic aqueous nitric acid solutions and the nitrate of the secondary amine Amberlite LA-1 in cyclohexane was investigated. The distribution of the excess acid and the alcohol (acetone) was also investigated. The U(IV) distribution data were correlated with 1) the content of nitric acid and U(IV)-hexanitratocomplex in the mixed aqueous-organic phase and 2) with the concentration of excess acid and methanol (acetone) in the organic phase. These correlations indicate that the extraction of U(IV) is mainly determined by 1) the shift of the complex equilibrium from the side of cationic species to that of neutral and anionic complexes and 2) the competition between these metal complexes and the acid as solvating partners for the extractant molecules. Spectrophotometric investigations show that in the organic phase uranium is present as a hexanitrato complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00909642
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of Radiation on Transistors in the First Telstar Satellite (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 741-744 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE Telstar communications satellite was planned as an experiment to investigate operating features of communications satellite systems, to obtain results of radiation effects in space and to examine, if necessary, the failure mode of the satellite. During the several months of successful operation ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/199741a0
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  • 8
    Electronic Resource
    Electronic Resource
    Beitrag zur Unterscheidung von Gärungsessig und synthetischem Säureessig durch die Bestimmung der spezifischen14C-Radioaktivität (1977)
    Springer
    European food research and technology 163 (1977), S. 121-122 
    Details
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Zusammenfassung Die Methode von Simon u. Mitarb. [2] zur Abtrennung der Essigsäure aus Essigen vor der Bestimmung der spezifischen14C-Radioaktivität wurde modifiziert. Die Ausfällung als Calcium-acetat und die anschließende Freisetzung der Säure mit Diphosphorsäure wurde durch einen Extraktions-schritt mit Diisopropyläther ersetzt und die Abtrennung dadurch verkürzt und verbilligt. Das Auffinden einer handelsüblichen Essigsäure (Merck p. A.) mit der natürlichen spezifischen14C-Radioaktivität auf dem österreichischen Markt führte dazu, daß das Vorhandensein einer natürlichen spezifischen14C-Aktivität wohl ein notwendiges, aber leider nicht mehr hinreichendes Kriterium für das Vorliegen reinen Gärungsessigs ist.
    Notes: Summary The method of Simon et al. [2] for the separation of the acetic acid from vinegar prior to the determination of the specific14C-radioactivity has been modified. The precipitation as calcium acetate and the preparation of free acetic acid by addition of diphosphoric acid has been replaced by an extraction procedure with diisopropylether which is faster and cheaper. On the Austrian market glacial acetic acid (Merck, p. A.) having the natural spezific14C-radioactivity was found. The natural specific14C-radioactitivity is therefore necessary but not sufficient to prove the biogenic origin of vinegar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01126032
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  • 9
    Electronic Resource
    Electronic Resource
    Herstellung und Charakterisierung von Komplexen des Uran(IV) mit Di-n-butylphosphorsäure in Kontakt mit Perchlor-, Schwefel- und Salpetersäurelösungen (1972)
    Springer
    Monatshefte für Chemie 103 (1972), S. 442-449 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Herstellung von festen Komplexen des Uran(IV) mit Di-n-butylphosphorsäure in Kontakt mit Perchlor-, Schwefel-und Salpetersäure wird beschrieben. Es ergab sich für die beiden ersten Fälle eine Zusammensetzung U(DBP)4 und für den letzten U(NO3)(DBP)3, wobeiDBP für das Anion der Di-n-butylphosphorsäure steht. Auf Grund der Infrarotspektren im Bereich von 4000 bis 700 cm−1 wurde versucht, Anhaltspunkte über die Bindungsverhältnisse in den Komplexen zu erhalten. Die Absorptionsbanden des U(NO3)(DBP)3-Komplexes bei 1520 und 1275 cm−1 weisen darauf hin, daß das Nitrat im wesentlichen kovalent an das Uran(IV) gebunden ist.
    Notes: Abstract The preparation of solid complexes of uranium(IV) with di-n-butyl phosphoric acid in contact with aqueous perchloric, sulfuric and nitric acid solutions is described. The formula was found to be U(DBP)4 for the complexes prepared in contact with the two first mentioned acids, and U(NO3)(DBP)3 for the complex prepared in contact with HNO3 (DBP stands for the anion of the di-n-butyl phosphoric acid). Absorption spectra were registered in the infrared region from 4000–700 cm−1. Due to the absorption bands at 1520 and 1275 cm−1 it seems, that the nitrato group is bound mainly covalent in the U(NO3)(DBP) complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00904946
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  • 10
    Electronic Resource
    Electronic Resource
    Continuous thermodilution cardiac output: clinical validation against a reference technique of known accuracy (1999)
    Springer
    Intensive care medicine 25 (1999), S. 166-172 
    Details
    ISSN: 1432-1238
    Keywords: Key words Cardiac output ; Haemodynamics ; Thermodilution technique ; Monitoring ; Catheterization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective: To evaluate the accuracy and precision of continuous thermodilution (CCO) by using a validated bolus thermodilution (BCO) reference technique as criterion standard. Design: Under circulatory steady state conditions, a CCO system (Vigilance, software versions 4.35 and 4.39) was validated with regard to CCO as well as iced and room temperature BCO. Setting: Intensive care unit at a university hospital. Patients: Method comparison was conducted in 56 cardiac surgical patients, 28 patients being allocated to one of the two software versions, and 14 within each group to either iced or room temperature BCO. Measurements and results: CCO readings were registered in duplicate before and after three to five bolus injections conducted with both the Vigilance and reference systems. Iced BCO showed excellent agreement between the Vigilance and reference systems, yielding SDs of bias of 0.41 and 0.37 l/min and linear correlation coefficients (r) of 0.97 and 0.96. With room temperature BCO, agreement was significantly less. CCO, irrespective of software version, showed higher SDs of bias (0.90 and 0.84 l/min) and lower r values (0.84 and 0.81) than iced BCO (p 〈 0.0001). CCO measurements with software version 4.39 yielded a similar SD of bias to that with room temperature BCO. Conclusion: Decreased precision of CCO as compared to iced BCO may, in clinical settings, be outweighed by the advantages of automated and continuous monitoring. Under research conditions, however, iced BCO remains the method of choice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001340050811
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