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  • 1
    Digitale Medien
    Digitale Medien
    Ribose administration during exercise: Effects on substrates and products of energy metabolism in healthy subjects and a patient with myoadenylate deaminase deficiency (1991)
    Springer
    Journal of molecular medicine 69 (1991), S. 151-155 
    Details
    ISSN: 1432-1440
    Schlagwort(e): Myoadenylate deaminase ; AMP-deaminase ; Deficiency ; Ribose ; Lactate ; Ammonia ; Hypoxanthine ; Muscle ; Metabolism
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Nine healthy men and a patient with myoadenylate deaminase deficiency were exercised on a bicycle ergometer (30 minutes, 125 Watts) with and without oral ribose administration at a dose of 2 g every 5 minutes of exercise. Plasma or serum levels of glucose, free fatty acids, lactate, ammonia and hypoxanthine and the urinary hypoxanthine excretion were determined. After 30 minutes of exercise without ribose intake the healthy subjects showed significant increases in plasma lactate (p〈0.05), ammonia (p〈0.01) and hypoxanthine (p〈0.05) concentrations and a decrease in serum glucose concentration (p〈0.05). When ribose was administered, the plasma lactate concentration increased significantly higher (p〈 0.05) and the increase in plasma hypoxanthine concentration was no longer significant. The patient showed the same pattern of changes in serum or plasma concentrations with exercise with the exception of hypoxanthine in plasma which increased higher when ribose was administered.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01665856
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  • 2
    Digitale Medien
    Digitale Medien
    Ergometer exercise in myoadenylate deaminase deficient patients (1993)
    Springer
    Journal of molecular medicine 71 (1993), S. 461-465 
    Details
    ISSN: 1432-1440
    Schlagwort(e): AMP deaminase ; Myoadenylate deaminase deficiency ; Muscular exercise ; Hypoxanthine ; Ammonia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Three patients with primary myoadenylate deaminase deficiency were subjected to exercise on a bicycle ergometer at 125 W for 30 minutes. Blood samples prior to, during, and at the end of exercise were analyzed for lactate, ammonia, and hypoxanthine. In addition, urinary hypoxanthine excretion was measured. In these patients the serum lactate level increased to concentrations between 7.9 and 9.0 mmol/1 at the end of exercise whereas the mean lactate level in nine control subjects at the end of exercise was 3.3 mmol/l (range 1.1–8.1 mmol/l). There was no difference to control subjects in the exercise-induced increase in plasma levels of ammonia and hypoxanthine or in the increase in urinary hypoxanthine excretion. The findings support the hypothesis of a reduced substrate supply to the citric acid cycle in myoadenylate deaminase deficiency. The normal formation of ammonia and hypoxanthine excludes a marked loss of adenine nucleotides in working muscles in these patients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00180060
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  • 3
    Digitale Medien
    Digitale Medien
    Continuously tunable, split-cavity gyrotrons (1985)
    Springer
    International journal of infrared and millimeter waves 6 (1985), S. 1237-1254 
    Details
    ISSN: 1572-9559
    Schlagwort(e): gyrotron ; millimeter-wave ; microwave ; electron cyclotron resonance maser ; resonant cavities ; frequency tuning
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The cavity of the University of Sydney gyrotron, GYROTRON IIIB, is split in two longitudinally to allow and frequency that lies between the fixed cavity resonances to be accessed by mechanically changing the separation of the two halves. The rate of change in resonant frequency with separation is greatest if the minor axis of the cavity cross-section is the one undergoing change. Results obtained with the latest cavity demonstrate this and show excellent agreement with theory.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01013212
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  • 4
    Digitale Medien
    Digitale Medien
    Tuneable millimeter-wave gyrotrons (1982)
    Springer
    International journal of infrared and millimeter waves 3 (1982), S. 725-734 
    Details
    ISSN: 1572-9559
    Schlagwort(e): gyrotron ; millimeter-wave ; microwave cavities ; microwaves ; electron cyclotron maser
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In the course of developing a low-power, tuneable millimeter-wave source, two gyrotrons have been constructed. Gyrotron I was a fixed-frequency device operating at 120 GHz while Gyrotron II produced more than 20 lines in the frequency range 130 to 260 GHz. The design of tuneable gyrotrons is discussed with reference to the Gyrotron II results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01009730
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  • 5
    Digitale Medien
    Digitale Medien
    Frequency detuning measurements in a low-power gyrotron (1983)
    Springer
    International journal of infrared and millimeter waves 4 (1983), S. 891-900 
    Details
    ISSN: 1572-9559
    Schlagwort(e): gyrotron ; millimeter-wave ; microwave ; electron cyclotron resonance maser ; frequency detuning ; frequency pulling
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Frequency detuning in the University of Sydney Gyrotron II has been measured for a number of modes in the vicinity of the TE0 14 1 mode at 183 GHz. The main features of the observations agree with theory and the importance of a detailed knowledge of the electron velocity distribution and the cavity Q's is established.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01009314
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  • 6
    Digitale Medien
    Digitale Medien
    Observation of mode conversion in gyrotrons (1985)
    Springer
    International journal of infrared and millimeter waves 6 (1985), S. 1255-1266 
    Details
    ISSN: 1572-9559
    Schlagwort(e): gyrotron ; millimeter-wave ; microwave ; electron cyclotron resonance maser ; mode conversion ; far-field imaging
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The observed output power levels in the University of Sydney's gyrotron can be accounted for only by including the effects of mode conversion at waveguidetaper transitions in the vicinity of the resonant cavity. A series of measurements taken from liquid-crystal images of the microwave fields beyond the output window confirms this.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01013213
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  • 7
    Digitale Medien
    Digitale Medien
    FAB and tandem mass spectrometry for endorphin- and ACTH peptides of molecular weight to 2000 (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 15 (1988), S. 649-657 
    Details
    ISSN: 0887-6134
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Four β-endorphins (β-endorphin 6-17, 2-17, 1-16, and 1-17) and two adrenocorticotropic hormone (ACTH) peptides (ACTH 1-10 and (1-16)-NH2) were studied by using fast atom bombardment coupled with tandem mass spectrometry. The capability to reproduce metastable ion and collisionally activated decomposition spectra on two different commercial sector mass spectrometers in two different laboratories was found to be acceptable (deviations in relative abundance are less than ± 50%). The endorphin peptides fragment metastably or upon collisional activation to give abundant B-series ions as well as Y-series ions, whereas Y-series ions are the principal ionic species produced upon the desorption by fast atom bombardment. The ACTH peptides also fragment to give Y-series ions, but of relatively low abundance compared to those from the endorphins. For both sets of peptides, high-energy collisionally activated decomposition and metastable ion decomposition daughter ion spectra are precise, structurally informative - even for peptides up to m/z 2000 - and complementary to spectra of daughter ions produced by desorption ionization alone.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200151203
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  • 8
    Digitale Medien
    Digitale Medien
    Fast atom bombardment and tandem mass spectrometry for structure determination: Remote site fragmentation of steroid conjugates and bile salts (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 15 (1988), S. 89-98 
    Details
    ISSN: 0887-6134
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A series of 35 steroid conjugates (sulfates and glucuronides) and bile salts were investigated by using fast atom bombardment and tandem mass spectrometry. Collisional activation of the [M - H]- anions of sulfate conjugates and bile salts predominantly yields fragment ions arising by reactions occurring remote from the charge site. These reactions are sometimes sensitive to differences in stereochemistry at positions remote from the charge site and are useful for positional isomer differentiation. On the other hand, collisional activation of the [M - H]- anions of the glucouronide conjugates leads primarily to charge-driven fragementations.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200150206
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  • 9
    Digitale Medien
    Digitale Medien
    Synthese von Hydroxyguanidinen aus Chlorformamidinen und OximenTeil der Dissertation M. Gross, Martin-Luther-Universität, Halle 1971. (1974)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 316 (1974), S. 434-442 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: N2-Aryl-N1,N1-dialkylchlorformamidine 1 reagieren mit Oximen über hydrolyseempfindliche Zwischenprodukte zu 2-Hydroxy-1-aryl-3,3-dialkylguanidinen 3.Diese Hydroxyguanidine bilden mit Benzoylchlorid O- und O,N-acylierte Verbindungen, mit Chlorameisensäureestern entstehen 3-Dialkylamino-4-aryl-5-oxo-Δ2-1,2,4-oxadiazoline 7. Die Reaktion mit Alkylhalogeniden führt zu 2-Alkoxy-1-aryl-3,3-dialkylguanidinen 8, und die katalytische Hydrierung liefert 1-Aryl-3,3-dialkylguanidine. Bei der Abspaltung der Oximinogruppe im saure Medium in Gegenwart von Oxydationsmitteln entstehen entsprechend substituierte Harnstoffe.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19743160311
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  • 10
    Digitale Medien
    Digitale Medien
    Reactions of propene and cyclopropane radical cations with neutral ethylene (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 185-192 
    Details
    ISSN: 0030-493X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The gas-phase reactions of propene and cyclopropane radical cations with neutral ethylene were investigated by using Fourier transform, chemical ionization and tandem mass spectrometries. Both reactions form covalent C5H10 adduct ions. The adduct ions are hypothesized to form initially as distonic radical cations that isomerize via a substituted cyclopropane intermediate and are detected as the most stable C5H10 isomer, the 2-methylbut-2-ene radical cation. The rate constant for each reaction is approximately 20% of the theoretical collision rate, indicating that product ions are formed in one out of every five collisions of the C3H6 radical cations with neutral C2H4.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/oms.1210280309
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