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  • Chemistry  (23)
  • Aldosteron
  • Anemometer, Thies Clima; Calculated; DATE/TIME; Glaciers Austria; HEIGHT above ground; Pegelstation_Vernagtbach_meteorology; Unmanned weather station/meteorological observation; UWST; Vernagtferner, Ötztaler Alpen, Austria; Wind direction; Wind direction, relative share; Wind direction, standard deviation; Wind speed; Wind speed, maximum; Wind speed, minimum
  • 1990-1994  (13)
  • 1980-1984  (11)
Document type
Keywords
Publisher
Years
Year
  • 1
    ISSN: 1432-1440
    Keywords: Primärer Aldosteronismus ; Aldosteron ; Nebenniere ; Primary aldosteronism ; Aldosterone ; Adrenal gland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The diagnostic validity of adrenal isotopic scanning, adrenal venous aldosterone, adrenal phlebography and computed abdominal tomography (CT) was studied in 44 patients with primary aldosteronism. In all patients the diagnosis was confirmed by surgery (unilateral adrenal adenoman=32, bilateral adrenal hyperplasian=12). Both adrenal scintiscan, adrenal venous aldosterone and CT allowed in a comparable high percentage of patients (71%) the exact classification of the adrenal lesion(s), whereas adrenal phlebography could distinguish adenoma from hyperplasia in 57%. Marked differences between the lateralization procedures, however, were observed in predicting incorrect preoperative identification: adrenal scintiscan 29%, adrenal venous aldosterone 3%, adrenal venography 6% and CT 0%. Finally, the percentage of patients in whom no differentation between the two main subgroups of primary aldosteronism could be obtained varied between 0% with adrenal isotopic scanning and 37% with adrenal phlebography (CT 29% and adrenal venous aldosterone 26%). Both scientiscan and adrenal venous aldosterone were not improved by the administration of dexamethasone. Our findings document that adrenal venous aldosterone determinations, adrenal isotopic scanning and computed tomography are equally valid in differentiating unilateral adenoma from bilateral adrenal hyperplasia in primary aldosteronism. However, adrenal scientiscan is hampered by a relative high percentage of incorrect results independant whether dexamethasone was used or not. Contrary, adrenal venous aldosterone and computed tomography seemed to have no or only a minor risk in assuming an incorrect classification of the adrenal lesion(s).
    Notes: Zusammenfassung Bei 44 Patienten mit primärem Aldosteronismus wurde die diagnostische Wertigkeit der seitengetrennten Aldosteronbestimmung im Nebennierenvenenblut, der Nebennierenphlebographie, der Nebennierenszintigraphie sowie der Computer-Tomographie untersucht. Bei allen Patienten wurde die Diagnose chirurgisch gesichert bzw. bestätigt (unilaterales Nebennierenrindenadenomn=32, bilaterale Nebennierenrindenhyperplasien=12). Sowohl die seitengetrennte Aldosteronbestimmung im Nebennierenvenenblut als auch die Nebennierenszintigraphie und die Computer-Tomographie erlaubten in einem vergleichbar hohen Prozentsatz (71%) die exakte Klassifizierung der Nebennierenrindenläsion(en), während die Nebennierenphlebographie in etwa 57% zwischen unilateralem Adenom und bilateraler Hyperplasie unterscheiden konnte. Deutliche Unterschiede ergaben sich jedoch in bezug auf eine inkorrekte präoperative Differenzierung: Nebennierenszintigraphie 29%, Nebennierenvenenaldosteron 3%, Nebennierenphlebographie 6% und Computer-Tomographie 0%. Der Prozentsatz der Patienten, bei denen aufgrund der Untersuchung keine Differenzierung zwischen den beiden Hauptgruppen des primären Aldosteronismus getroffen werden konnte, schwankte zwischen 0% bei Szintigraphie und 37% bei der Phlebographie (Nebennierenvenenaldosteron 26% und Computer-Tomographie 29%). Die Aussagefähigkeit sowohl der Szintigraphie als auch der Aldosteronbestimmung im Nebennierenvenenblut konnte durch die zusätzliche Gabe von Dexamethason nicht verbessert werden. Unsere Ergebnisse zeigen, daß beim primären Aldosteronismus die Aldosteronbestimmung im Nebennierenvenenblut, die Nebennierenszintigraphie sowie die Computer-Tomographie in ihrer diagnostischen Wertigkeit zur Differenzierung zwischen unilateralem Adenom und bilateraler Hyperplasie vergleichbar gut sind. Die Nebennierenszintigraphie ist jedoch durch einen relativ hohen Prozentsatz an falscher Klassifizierung der Nebennierenrindenläsion(en) belastet. Demgegenüber scheint sowohl die Aldosteronbestimmung im Nebennierenvenenblut als auch die Computer-Tomographie nur ein geringes Risiko an inkorrekter Differenzierung zwischen Adenom und Hyperplasie zu besitzen.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Separation and Quantitation of All Eight Stereoisomers of α-Tocopherol by ChromatographyThe results of the analysis of several derivatives of (all-rac)-α-tocopherol by HPLC on a chiral stationary phase and by capillary GC on a achiral stationary phase are reported. Consecutive application of both methods to the ethyl-ether derivative allows the separation and quantification of all eight possible stereoisomers of (all-rac)-α-tocopherol.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 941-954 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Statistical Syntheses of RotaxanesThe acetalisation of the 28-membered cyclic diols 11a, b with the long-chain dibromo ketone 12 gives acetals 13a, b. These compounds react with triphenylmethyllithium to give 17a, b and 18a, b from which the rotaxanes 20a, b are obtained in 0.066 or 0.18 and 0.12% yield, respectively, after hydrolysis of the acetal bonds. The reacetalisation of rotaxane 20b affords, by an intraannular reaction, the prerotaxane 18b in pure form.
    Notes: Die Acetalisierung der 28-gliedrigen cyclischen Diole 11a, b mit dem langkettigen Dibromketon 12 ergibt die Acetale 13a, b. Nach Umsetzung mit Triphenylmethyllithium zu 17a, b und 18a, b werden nach Hydrolyse der Acetalbindungen die Rotaxane 20a, b in Ausbeuten von 0.066 und 0.18 bzw. 0.12% als farblose Öle isoliert. Durch Reacetalisierung von 20b wird in einer intraannularen Reaktion das Prärotaxan 18b in reiner Form erhalten.
    Additional Material: 1 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 1038-1044 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Pyridylhydrazones as Carbonyl Derivatives to induce Fragmentation in Mass SpectrometryIt was found that the 2-pyridylhydrazone is a derivative of the carbonyl group, which is able to induce fragmentation of an alicyclic skeleton with an efficiency comparable to that of the tertiary amino group and the ethylene acetal group.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 15 (1992), S. 300-312 
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Thick-walled components subjected to pulsating internal pressure are widely applied in high-pressure technology and in manufacturing processes such as fluid-jet cutting and high-pressure cleaning, mainly in conjunction with reciprocating pumps. Corrosive fluids require high-strength and tough chrome-nickel steels with soft martensitic or semi-austenitic structure. This contribution reports on the fatigue of thick-walled plain and cross-bored pipes made from high alloy chrome-nickel steels such as X5 CrNiMoCu 21 8 and X5 CrNiMo 16 5. The speciments, uniaxial standard form and thick-walled pipes, were cut from forged blocks in the three axial directions. For loading with pulsating pressure, a suitable, high-frequency piston pulsation machine has been developed. The fatigue tests on pipe specimens show typical Woehler characteristics with only slight scatter and relatively good isotropy. The surprisingly large admissible pulsating pressure can be explained for the applied steels by dynamic generation of residual stresses as a result of shake-down effects. Presentation in a Smith digram explains the occuring dynamic shake-down and its favourable results in comparison to the more brittle highly tensile steels. It also reveals that heat treatment to higher tensile strength does not always yield an increase in the admissible pulsating pressure. It will be shown that static autofretting and shake-down affect the fatigue strength of thick-walled pipe specimens in the same way. Tests with internal liners in the tube specimens provide indications on the sensitivity of material failures towards fluids. The investigation aids the understanding of the fatigue behaviour and the design of components made of modern high-strength corrosion resistant steels.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Titanium silicalite-1 samples of different particle size are synthesised and characterised by X-ray diffraction (XRD), photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (DRS), Raman and infrared spectroscopy. Size histograms are taken from transmission electron micrographs. Temporal changes of activity and selectivity for the hydroxylation of phenol and anisole are monitored. It is postulated that the p/o product ratios are due to the greater chemisorption of the ortho molecule.
    Additional Material: 4 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1994), S. 379-379 
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1040-7685
    Keywords: capillary gas chromatography ; capillary supercritical fluid chromatography ; enantiomeric alcohols ; diastereomeric esters ; Trolox methyl ether ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The enantiomers of aliphatic alcohols are transformed by a new chiral reagent (S)-Trolox methyl ether to their diastereomeric esters which are separated by capillary GC or SFC on achiral columns. The applicability of this reagent and its superiority to the hitherto known reagents are demonstrated by selected examples.
    Additional Material: 5 Ill.
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  • 9
    ISSN: 0009-286X
    Keywords: Dosieren ; Schüttguttechnik ; Schneckendosierer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1088-1090 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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