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  • 1
    Electronic Resource
    Electronic Resource
    Metabolism of D-ribose administered continuously to healthy persons and to patients with myoadenylate deaminase deficiency (1989)
    Springer
    Journal of molecular medicine 67 (1989), S. 1205-1213 
    Details
    ISSN: 1432-1440
    Keywords: (D-)ribose ; Metabolism ; Myoadenylate ; (adenylate-, AMP-)deaminase deficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary D-ribose was administered orally or intravenously over at least 5 h to eight healthy volunteers and five patients with myoadenylate deaminase deficiency. Intravenous administration rates were 83, 167, and 222 mg/kg/h, which were well tolerated but oral administration of more than 200 mg/kg/h caused diarrhea. The average steady state serum ribose level ranged between 4.8 mg/100 ml (83 mg/kg/h, oral administration) and 81.7 mg/100 ml (222 mg/kg/h, intravenous administration). Serum glucose level decreased during ribose administration. The intestinal absorption rate of orally administered ribose was 87.8%–99.8% of the intake at doses up to 200 mg/kg/h without first pass effect. Urinary losses were 23% of the intravenously administered dose at 222 mg/kg/h. Ribose appeared to be excreted by glomerular filtration without active reabsorption; a renal threshold could not be demonstrated. The amount of ribose transported back from the tubular lumen depended on the serum ribose level. There was no difference in ribose turnover in healthy subjects and patients with MAD deficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01716208
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Keywords: Myoadenylate deaminase ; AMP-deaminase ; Deficiency ; Ribose ; Lactate ; Ammonia ; Hypoxanthine ; Muscle ; Metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01665856
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Keywords: gyrotron ; millimeter-wave ; microwave ; electron cyclotron resonance maser ; frequency detuning ; frequency pulling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009314
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  • 4
    Electronic Resource
    Electronic Resource
    Tuneable millimeter-wave gyrotrons (1982)
    Springer
    International journal of infrared and millimeter waves 3 (1982), S. 725-734 
    Details
    ISSN: 1572-9559
    Keywords: gyrotron ; millimeter-wave ; microwave cavities ; microwaves ; electron cyclotron maser
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009730
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  • 5
    Electronic Resource
    Electronic Resource
    Continuously tunable, split-cavity gyrotrons (1985)
    Springer
    International journal of infrared and millimeter waves 6 (1985), S. 1237-1254 
    Details
    ISSN: 1572-9559
    Keywords: gyrotron ; millimeter-wave ; microwave ; electron cyclotron resonance maser ; resonant cavities ; frequency tuning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01013212
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  • 6
    Electronic Resource
    Electronic Resource
    Observation of mode conversion in gyrotrons (1985)
    Springer
    International journal of infrared and millimeter waves 6 (1985), S. 1255-1266 
    Details
    ISSN: 1572-9559
    Keywords: gyrotron ; millimeter-wave ; microwave ; electron cyclotron resonance maser ; mode conversion ; far-field imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01013213
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    Paper (German National Licenses)
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