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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 100 (1981), S. 1-12 
    ISSN: 1432-1335
    Keywords: Carcinoids ; Endocrine tumors ; Scirrhous carcinomas ; MNNG ; Carcinoide ; Endokrine Tumoren ; Scirrhöse Carcinome ; MNNG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Durch orale Applikation von MNNG (N-methyl-N′-nitro-N-nitrosoguanidin) wurden Carcinoide im Drüsenmagen von Ratten erzeugt. Dreißig Wistar-Ratten wurde eine 70 μg/ml Lösung von MNNG 35 Wochen lang verabreicht, dann erhielten die Tiere 20–30 Wochen lang Leitungswasser. Bei vier von 20 weiblichen und zwei von zehn männlichen Tieren wurden Carcinoide im Drüsenmagen gefunden, Metastasen wurden nicht beobachtet. Die Tumoren waren vorwiegend im Fundusbereich entlang der großen curvatur lokalisiert. Histologisch zeigten die Carcinoide medullär-anaplastische Strukturen, die aus zwei Typen endokriner Zellen bestanden. Der erste Typ war Argentaffin und hatte elektronendichte, mäßig irreguläre Sekretgranula (437–810 nm); der zweite zeigte eine argyrophile Reaktion und hatte runde Sekretgranula mit elektronendichtem Core unter Ausbildung eines Halo (550 nm). Immunhistologische Untersuchungen (PAP-Methode) ergaben keine positiven Reaktionen am Zytoplasma der Tumorzellen gegenüber Antiseren von Gastrin, Insulin, Glucagon und Enkephalin. Einer dieser endokrinen Tumoren entwickelte sich weiter zum scirrhösen Carcinom; ein differenziertes Adenocarcinom des Drüsenmagens wurde nicht festgestellt.
    Notes: Summary A total of 30 inbred Wistar rats were orally administered 70 μg/ml solution of N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) for 35 weeks and then tap water for the following 20 to 30 weeks. Four of the 20 females and two of ten males developed carcinoids in the glandular stomach, but no metastasis could be found. Carcinoids developed most frequently in the fundic portion along the greater curvature. Histologically, these tumors were medullary anaplastic carcinomas containing two different endocrine cell populations. The first cell type was argentaffin having electron-dense, somewhat pleomorphic secretory granules (437–810 nm) and the second type was argyrophil having round granules with a dense core and a pale halo (550 nm). None of these tumors showed endocrine immunoactivity for gastrin, somatostatin, insulin, glucagon, and enkephalin. One of these gastric tumors developed into scirrhous carcinoma, but differentiated adenocarcinoma could not be seen in the glandular stomach.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International journal of infrared and millimeter waves 4 (1983), S. 549-559 
    ISSN: 1572-9559
    Keywords: interferometer ; polarimeter ; water-vapor laser ; far-infrared ; plasma diagnostics ; compact toroid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A high-power CW 27.972 μm water-vapor laser has been developed for interferometric and polarimetric measurements of plasmas. The maximum output power and the power density in the cavity of the laser with 2.0 cm bore and 220 cm length reach 85 mW and 109 μW/cm3, respectively. An interferometer using this laser is constructed and its performance is examined as a study on polarimetric method of magnetic field measurement. Preliminary interferometric experiments are also carried out on a compact toroidal plasma with field-reversal configuration.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of infrared and millimeter waves 5 (1984), S. 1039-1052 
    ISSN: 1572-9559
    Keywords: H2O laser ; Faraday rotation ; polarimetry ; far-infrared ; plasma diagnostics ; compact toroid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A fast response frequency-modulated interferometric polarimeter was designed and constructed with a single 28 μm H2O laser for high density plasma diagnostics. This newly developed modulation system employs an electro-magnetically driven movable mirror to achieve the modulation frequency beyound 1 MHz for about 100 μs duration. The movable mirror performance is studied experimentally in detail. The determination of the Faraday rotation angle is based on the zero-crossing method for the observed beat signals produced by two kinds of rotating plane-polarized waves. The feasibility of the polarimeter constructed was verified in experiments of a field-reversed thetapinch plasma.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    International journal of infrared and millimeter waves 2 (1981), S. 1199-1208 
    ISSN: 1572-9559
    Keywords: water vapor laser ; plasma diagnostics ; interferometer ; waveguide laser ; far-infrared
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A high-power CW 27.972 μm water vapor laser has been constructed in order to use as a light source of an interferometer for plasma diagnostics. The laser consists of 220 cm length and 2.0 cm small bore Pyrex glass discharge tube, semi-confocal resonator and Michelson coupler. From the measurement of cavity detuning curves, it is found that two waveguide modes, EH11 and EH21 oscillate. The increase of the output power is found to become more than seven times larger by adding He(50%)−H2(50%) mixed gas. Under the optimum condition, the maximum output power of 65 mW or the output power per unit cavity volume of 83 μW/cm3 is obtained.
    Type of Medium: Electronic Resource
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