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  • Articles: DFG German National Licenses  (5)
  • 1970-1974  (5)
  • 1900-1904
  • 1974  (5)
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  • Articles: DFG German National Licenses  (5)
Material
Years
  • 1970-1974  (5)
  • 1900-1904
Year
  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 248 (1974), S. 528-529 
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 6 (1974), S. 419-420 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 22 (1974), S. 367-391 
    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
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  • 4
    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
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 408 (1974), S. 205-208 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: About Ag6(SO4)(SiO4)Hitherto unknown Ag6(SO4)(SiO4) has been prepared at 400-500°C under an oxygen pressure more than 1000 atm. By single crystal X-ray work the structure of tetragonal Ag6(SO4)(SiO4) has been elucidated: a = 7.060, c = 17.660 Å; D4h19-141/amd; Z = 4. The crystal structure shows a new type in which the tetrahedrally sulfat- and silicat groups are definite distinguishable. As well the both crystallographic silver positions show a different crystal-chemical character.
    Notes: Neu dargestellt wurde Ag6(SO4)(SiO4) bei 400-500°C unter einem Sauerstoffdruck größer als 1000 atm. Nach röntgenographischen Untersuchungen der rubinroten Einkristalle kristallisiert die Verbindung tetragonal: a = 7,060, c = 17,660 Å; D4h19-141/amd; Z = 4. Die Kristallstruktur von Ag6(SO4)(SiO4) stellt einen neuen Strukturtyp dar, worin die tetraedrischen Sulfat- und Silicatgruppen deutlich unterscheidbar sind. Ebenso weisen die beiden kristallographischen Silberpositionen verschiedenartige kristallchemische Charaktere auf.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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