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  • 1
    Electronic Resource
    Electronic Resource
    Potential scan voltammetry with finite diffusion. Unified theory (1972)
    s.l. : American Chemical Society
    Analytical chemistry 44 (1972), S. 434-442 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60311a008
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Difference approximations for singular perturbations of systems of ordinary differential equations (1974)
    Springer
    Numerische Mathematik 22 (1974), S. 367-391 
    Details
    ISSN: 0945-3245
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary We consider difference methods for the solution of singular perturbations of boundary value problems. The solutions are smooth except in boundary layers of thickness ε|logε|, 0〈ε≪1. Various difference schemes with a uniform stepsizeh are considered. In practice,h is usually much larger than the boundary layer regions. Then the difference methods must be choosen with care. It is shown that only approximations of low order accuracy can be used. However, one can increase the accuracy by a Richardson procedure. Asymptotic expansions in powers ofh and ε are given for the solutions of the proposed methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436920
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  • 3
    Electronic Resource
    Electronic Resource
    Enhancement of cerebral noradrenaline turnover by thyrotropin-releasing hormone (1974)
    [s.l.] : Nature Publishing Group
    Nature 248 (1974), S. 528-529 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Male albino rats of 200 g, Wistar origin, were injected intraperitoneally with TRH. Thereafter noradrenaline, dop-amine, 5-hydroxytryptamine (5-HT) as well as their corresponding main metabolites 3-methoxy-4-hydroxyphenyl-ethyleneglycol (MOPEG, isolated as the sulphate ester), homovanillic acid and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/248528a0
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  • 4
    Electronic Resource
    Electronic Resource
    KINETIC STUDIES ON OPTIMAL CONDITIONS FOR THE AUTOMATED DETERMINATION OF LOW IODINE CONCENTRATIONS BY THE SANDELL-KOLTHOFF REACTION (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 220 (1973), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1973.tb40246.x
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  • 5
    Electronic Resource
    Electronic Resource
    84. Postoperative Laboratoriumsuntersuchungen (1973)
    Springer
    Langenbeck's archives of surgery 334 (1973), S. 631-639 
    Details
    ISSN: 1435-2451
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In der postoperativen Phase unterstützt das Laboratorium die ärztlichen Aufgaben bei der Kontrolle (und evtl. Steuerung) vitaler Funktionen, der postoperativen Therapie, der Fall-spezifischen Funktionen entsprechend dem gegebenen Grundleiden oder dem durchgeführten chirurgischen Eingriff, der Verhütung von Sekundär-Erkrankungen (Komplikationen) und schließlich bei der Kontrolle der Rehabilitation. Dazu dienen physikalische, physikalisch-chemische, hämatologische, gerinnungsphysiologische und klinisch-chemische Verfahren. Ihre Hauptanwendung finden die klinisch-chemischen Verfahren bei der Kontrolle Fall-spezifischer Funktionen. Zur Kontrolle der Rehabilitation hat sich die Bestimmung des Cholesterins als überraschend aussagefähige Untersuchung erwiesen.
    Notes: Summary In the postoperative phase the laboratory supports the doctor in monitoring (and perhaps influencing) the vital functions, the postoperative therapy, the specific functions which may be affected by the basic condition or the operation performed, the prevention of complications, and finally the patient's rehabilitation. The necessary information is obtained from physical, physicochemical, hematological, hemostasiological, and clinicochemical tests. The main value of clinicochemical tests lies in the insight they allow into the state of specific functions. Estimation of blood cholesterol has proved to have surprising prognostic value in the assessment of rehabilitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01286625
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of spreading depression on electrical activity and dopamine turnover in the striatum of rats (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 452-454 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Während einstündiger epiduraler Applikation vo n25% KCl zeigte sich bei Ratten eine Abnahme der elektrischen Aktivität im homolateralen Cortex und Striatum (spreading depression), die nach Entfernung des KCl reversibel war. Mit dem Auftreten von EEG-Veränderungen erfolgte im Gehirn auch ein reversibler Anstieg der Homovanillinsäure, nicht aber des Dopamins (DA), wahrscheinlich als Ausdruck eines gesteigerten DA-Umsatzes. Es wird geschlossen, dass während unilateraler epiduraler KCl-Applikation eine Inaktivierung des homolateralen Striatums besteht, welche möglicherweise durch Desaktivation einer inhibitorischen cortico- und/oder striato-nigralen Bahn zu einer Erhöhung des DA-Umsatzes führt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01926777
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  • 7
    Electronic Resource
    Electronic Resource
    Depletion of cerebral monoamines byp-chlorophenylalanine in the cat (1972)
    Springer
    Cellular and molecular life sciences 28 (1972), S. 177-178 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung p-Chlorphenylalanin, ein Inhibitor der Serotoninbiosynthese, senkte bei Katzen den Serotoningehalt des Gehirns nicht selektiv. Es wurde gleichzeitig eine signifikante und langanhaltende Erniedrigung des Noradrenalin- und Dopamingehalts gefunden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01935741
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  • 8
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1973)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 24 (1973), S. 470-472 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01595236
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  • 9
    Electronic Resource
    Electronic Resource
    Doppler-Ultraschalldiagnostik bei obliterierenden Prozessen der Aa. carotides: Doppelseitige Stenosen mit paradoxer oder fehlender neurologischer Symptomatik (1974)
    Springer
    Journal of neurology 207 (1974), S. 211-226 
    Details
    ISSN: 1432-1459
    Keywords: Carotid artery obliteration ; Cerebral vascular accident ; Doppler ultrasound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Durch percutane Messungen der Strömungsverhältnisse in den frontoorbitalen Endarterien der Aa. ophthalmicase — Aa. supratrochlearis et supraorbitalis — mit Doppler-Ultraschall lassen sich etwa 90% aller hämodynamisch wirksamen Lumeneinengungen der A. carotis ohne genauere Lokalisation unblutig diagnostizieren. Dabei werden subtotale Stenosen und Okklusionen mit an Sicherheit grenzender Wahrscheinlichkeit erfaßt. Der Untersuchungsablauf erfordert die systematische Kompression von Aa. temporalis superficialis, facialis und carotis communis, letzteres über 3 bis 5 Herzaktionen. R-Zacken-getriggerte Mittelwertbildung des Strömungssignals über 30 Herzaktionen ergänzt den akustischen Strömungseindruck und die direkt registrierte Strömungsgeschwindigkeit, wobei Strömungspulswellen und gemittelte Latenz des systolischen Strömungspulsanstiegs-punktes zur Herzaktion sichtbar werden. Asymptomatische schwere Stenosen werden meist über den Circulus arteriosus (Willisi) kompensiert. Treten dazu kontralateral wesentlich geringfügigere Lumeneinengungen auf, so können sich Hemisphärensymptome ergeben, die von der primär nicht obstruierten A. carotis ausgehen. Im Untersuchungsablauf zeigen die massiven Lumeneinengungen mit pathologischen Strömungsverhältnissen und pathologischen Reaktionen auf systematische Kompression von Externaästen und A. carotis communis an. Sie werden sicher diagnostiziert, auch wenn sie im ersten Moment im Widerspruch zur klinischen Symptomatik stehen. Unter 350 Fällen finden sich in unserem Untersuchungsgut 4 Patienten mit asymptomatischen schweren Obstruktionen oder zu diesen nicht passenden Hemisphärensymptomatik. Sie werden hier beschrieben und die Doppler-sonographischen Befunde mit einem Normalfall verglichen.
    Notes: Summary Percutaneous measurements with Doppler ultrasound techniques over the supratrochlear and supraorbital arteries — both terminal branches of the ophthalmic artery — may detect a stenosis in the carotid artery with a probability of 90% without giving the exact location. Subtotal or complete obstructions are diagnosed to an even higher percentage. The technique requires systematic compression of the superficial temporal, facial, and common carotid arteries, the last over 3 to 5 cardiac cycles. An average of the flow signals over 30 cardiac cycles complements the acoustic impression and the flow velocity directly registered. Flow pulse waves and mean latency of the systolic ascent in regard to the R peak of the ECG become visible. The circle of Willis compensates for most of the asymptomatic subtotal or total obstructions. If an additional much less obstructive process in the contralateral carotid artery occurs, there may be neurological symptoms originating in the hemisphere the carotid artery of which was not primarily affected. During an examination severe obstructions are indicated by pathological flow signals and pathological reactions on systematic compression of external carotid artery branches and the ipsiand contralateral common carotid artery. They are diagnosed with very high reliability, even if there is a contradiction to the clinical findings. From 350 cases 4 patients were found with asymtomatic severe obstructions or with clinical symptoms pointing to the uninvolved hemisphere. The Doppler findings are demonstrated and compared with a normal case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312562
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  • 10
    Electronic Resource
    Electronic Resource
    The relationship between neuronal activity of chemoreceptor fibers and tissue $$P_{O_2 }$$ of the carotid body of the cat during changes in arterial $$P_{O_2 }$$ and blood pressure (1973)
    Springer
    Pflügers Archiv 343 (1973), S. 287-296 
    Details
    ISSN: 1432-2013
    Keywords: Carotid Body ; Chemoreceptor Activity ; Tissue $$P_{O_2 }$$ ; Local Blood Flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The relationship between $$P_{GO_2 }$$ , $$P_{aO_2 }$$ , local blood flow, and the activity of individual chemoreceptor fiber units of the cat's carotid body was studied during changes in the arterial oxygen partial pressure and the arterial systemic blood pressure. The following results were obtained: 1. In the normal physiological range $$P_{GO_2 }$$ follows $$P_{aO_2 }$$ almost linearly. 2. The curves of neuronal activity depending on $$P_{aO_2 }$$ or $$P_{GO_2 }$$ have different shapes. 3. Hypoxia and hyperoxia change the relationship between $$P_{aO_2 }$$ and $$P_{GO_2 }$$ as well as the relationship to the neuronal activity. When returning to normal conditions, the initial relationship is re-established. 4. Considerable changes in local flow do not change local tissue $$P_{O_2 }$$ and do not influence the neuronal activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00595816
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