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  • 1
    Electronic Resource
    Electronic Resource
    XeCl discharge diagnostic by holographic interferometry (1988)
    Springer
    Applied physics 47 (1988), S. 1-6 
    Details
    ISSN: 1432-0649
    Keywords: 42.40 ; 52.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A direct measurement of the electron-density time evolution in the active medium of a self-sustained XeCl laser discharge has been performed by means of the holographic interferometry technique. The time and space resolved behaviour of the discharge seems to confirm that the halogen depletion instability and the hot spots developing in the cathode region are the basic mechanisms which determine the premature termination of the output laser pulse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696201
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  • 2
    Electronic Resource
    Electronic Resource
    Bilateral coracoclavicular joint (1998)
    Springer
    European journal of orthopaedic surgery & traumatology 8 (1998), S. 179-181 
    Details
    ISSN: 1432-1068
    Keywords: Coracoclavicular joint ; 3D SDD radiographic images
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Following the incidental discovery of a bilateral coracoclavicular joint, the authors undertook a radiologic study including helical CT scan and MRI. The 3D SDD images obtained are to the best of the knowledge of the authors, the first 3D radiographic representation of these joints. The supposed embryology and distribution of these joints are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01681656
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  • 3
    Electronic Resource
    Electronic Resource
    Diameter of coronary arteries in infancy (1989)
    Springer
    European journal of pediatrics 149 (1989), S. 144-145 
    Details
    ISSN: 1432-1076
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01995870
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of pirenzepine on plasma insulin, glucagon and pancreatic polypeptide levels in normal man (1985)
    Springer
    European journal of clinical pharmacology 27 (1985), S. 701-705 
    Details
    ISSN: 1432-1041
    Keywords: pirenzepine ; pancreatic hormones ; insulin ; glucagon ; pancreatic polypeptide ; cholinergic system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The secretion of various pancreatic hormones (insulin, glucagon and pancreatic polypeptide) is affected to a different extent by the cholinergic system. In 7 healthy subjects the effects of treatment for 1 week with pirenzepine, an anticholinergic drug selective for muscarinic receptors, on basal secretion of these hormones and on that induced by i.v. glucose (IVGTT) and arginine were evaluated. The drug did not reduce basal levels of insulin and glucagon whereas it caused an appreciable reduction in basal pancreatic polypeptide (PP). The responses of insulin and blood glucose to IVGTT and to arginine were not changed by treatment, nor was that of plasma glucagon to arginine. The infusion of arginine did induce an increase in PP level, which reached a statistically significant maximum at 90 min. This response was not particularly different after administration of pirenzepine. Thus, the results confirm the finding that arginine stimulates PP secretion in vivo and that pirenzepine reduces the basal level of the hormone, whereas it did not appear to affect the response to arginine. The findings exclude any direct action of the drug on insulin or glucagon secretion or on glucose metabolism in general.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00547053
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  • 5
    Electronic Resource
    Electronic Resource
    A ring-cavity for a quadrupled Nd-Yag lasera (1990)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 927-933 
    Details
    ISSN: 0392-6737
    Keywords: Harmonic generation ; frequency conversion ; parametric oscillation ; parametric amplification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary A new high-powered ultraviolet laser system is proposed. The system doubles the infrared light from a Nd-Yag laser mode-locked at 100 MHz, injects this light into a storage-ring cavity to accumulate a high power in the visible and then doubles this into the ultraviolet at 2600 Å. The power levels anticipated at this wavelength are much larger than those of commercially available c.w. lasers. The new system can have a far-reaching impact in basic research and, even more so, in a great many industrial applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453039
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  • 6
    Electronic Resource
    Electronic Resource
    From light modulation to complete mode locking in an argon-ion laser (1988)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 417-424 
    Details
    ISSN: 0392-6737
    Keywords: Laser beam modulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si discute la tecnica del mode-locking applicata ad una cavità laser di lunghezza inusuale nell'ambito della teoria di Harris-McDuff. Sono presentati i risultati sperimentali ed un confronto con le previsioni teoriche.
    Abstract: Резюме В рамках теории Харриса-Мак Дуфу обсуждается запирание моды в резонаторе длинного лазера. Приводятся экспериментальные результаты и проводится сравнение с теоретическими предсказаниями.
    Notes: Summary The mode locking of a long laser cavity is discussed in the framework of the Harris-McDuff theory. Experimental results are presented and compared with theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450131
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of a high-uniformity, X-ray preionized XeCl laser (1987)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 9 (1987), S. 873-891 
    Details
    ISSN: 0392-6737
    Keywords: Lasing processes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presentano le caratteristiche costruttive e operative di un laser a XeCl preionizzato a raggi X e funzionante in regime di scarica autosostenuta. Si sono ottenuti impulsi laser con energie specifiche di 3.3 J/l e durata di 150 ns. L’uniformità spaziale del fascio laser di dimensioni (3.5×3.5) cm2 è risultata migliore del 90%. La massima efficienza intrinseca raggiunta senza l’uso di un circuito esterno di preimpulso è stata del 3.6%. L’introduzione del preimpulso ad alta tensione per intensificare la preionizzazione ha consentito di migliorare l’accoppiamento in energia depositata nel mezzo attivo e di ottenere un punto di lavoro piú stabile a tensione di pompaggio piú bassa.
    Abstract: Резюме Описываются конструкция и характеристики рентгеновского предионизационного XeCl лазера. Были получены лазерные импульсы с удельной энергией 3.3 Дж/литр и длительностью 150 нс. Пространственная однородность лазерного пучка с размерами (3.5×3.5) см2 была лучше 90%. Была получена внутренняя эффективность вплоть до 3.6% без использования внешнего предимпульсного тока. Успешно опробовано введение предимпульса высокого напряжения для интенсификации предионизации. Получено улучшение связи энергии в активной среде и более надежные условия работы лазера при меньшем напряжении.
    Notes: Summary The construction and the operating characteristics of a X-ray preionized discharge XeCl laser are described. A specific laser output energy of 3.3 J/l with a pulsewidth of 150 ns and a spatial beam uniformity better than 90% in a (3.5×3.5) cm2 cross-section was achieved. Intrinsic efficiency up to 3.6% has been obtained without the use of an external prepulse circuit. A fast, high-voltage prepulse to intensify the preionization has been successfully tried out, obtaining a better energy coupling to the gas and more reliable conditions at lower working voltage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453756
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  • 8
    Electronic Resource
    Electronic Resource
    Gain, absorption and saturation intensity measurements of an X-ray preionized, discharge pumped XeCl laser (1989)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 1733-1749 
    Details
    ISSN: 0392-6737
    Keywords: Excimer lasers ; Ultraviolet spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto I coefficienti di guadagno a piccolo segnale e di assorbimento di un laser a eccimero XeCl, preionizzato a raggi X, sono stati misurati sia in funzione del tempo che della lunghezza d'onda. Inoltre sono stati ottenuti due valori per l'intensità di saturazione usando l'analisi di Rigrod sull'evoluzione dell'intensità fotonica all'interno della cavità e misure di guadagno in condizioni di saturazione.
    Abstract: Резюме Измеряются усиление малых сигналов и коэффициенты поглощения рентгеновского, предионизонного XeCl лазера с высокой однородностью. С высоким разрешением одновременно определяются временная эволюция и зависимость от длины волны. Получаются две различные оценки интенсивности насьшения, используя анализ внутриполостной интенсивности и измерения усиления.
    Notes: Summary The small signal gain and absorption coefficients of a high uniformity, X-ray preionized XeCl laser have been measured. Their time evolution and wavelength dependence have been simultaneously detected with high resolution. Two distinct estimates of the saturation intensity were obtained by means of a Rigrod-type analysis of the intracavity intensity and by using saturated gain measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459118
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  • 9
    Electronic Resource
    Electronic Resource
    Properties of Escherichia coli K-12 mutants that are sensitive to chlorate when grown aerobically (1978)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 4 (1978), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1978.tb02870.x
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  • 10
    Electronic Resource
    Electronic Resource
    Specific sodium dependence of a nitrate reductase in a marine bacterium (1987)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 48 (1987), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The two key enzymes of denitrification, the nitrate and nitrate reductases, were studied in a marine organism, Pseudomonas nautica, strain 617. Both enzymes were grown under anaerobic conditions with either nitrate or nitrous oxide as electron acceptor. The effect of sodium on these enzymes was studied. Only sodium activated the membranous and purified nitrate reductase, and none of the salts affected nitrite reductase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1987.tb02505.x
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