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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7073-7077 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper the attenuation length measurements in lead arachidate [(C19H39COO)2Pb] Langmuir Blodgett films deposited on copper was reported on. A discrete layer model appropriate to the ordered structure of these built up films is applied to the measurements of the x-ray photoemission intensity variation with electron takeoff angle and attenuation lengths for Pb 4f7/2, O 1s and Cu 2p3/2 electrons (kinetic energy range 550–1350 eV) are determined. There is evidence for the dependence of the attenuation length on the dielectric properties of the film/substrate interface through a variation of the film thickness.
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8631-8635 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Attenuation lengths in cadmium arachidate [(C19H39COO)2Cd] multilayer Langmuir–Blodgett films deposited on thick lead arachidate [(C19H39COO)2Pb] films have been determined in this communication. A discrete layer model appropriate to the ordered structure of these built-up films is proposed and applied for the first time to the measurements of the x-ray photoemission intensity variation with electron takeoff angle and attenuation lengths for 950–1350 eV electrons are evaluated. These lengths agree with earlier attenuation length measurements in Langmuir–Blodgett films and are higher than in most inorganic materials.
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  • 3
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 454-458 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 225-230 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 39 (1983), S. 675-677 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 3 (1984), S. 701-709 
    ISSN: 0392-6737
    Keywords: Conductivity phenomena in semiconductors and insulators ; Photoconduction and photovoltaic effects ; photodielectric effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Monocristalli puri di PbI2 sono stati accresciuti con la tecnica di raffinazione a zone ed è stata registrata la distribuzione spettrale della fotocorrente con l'uso di diversi laser a colore conE‖c eE⊥c. Il bordo di assorbimento fondamentale appare a 2.36 eV (E⊥c) e appare essere dicromatico in natura con una separazione di 0.05 eV. Lo schema di decadimento della fotocorrente a diversi voltaggi, temperature ed intensità d'illuminazione è stato usato per calcolare le vite medie dei portatori di carica. Le caratteristiche di voltaggio-fotocorrente sono state usate per calcolare la concentrazione di trappole e la mobilità dei portatori di carica. Le caratteristiche lux-ampère alla frequenza del bordo della banda sono state studiate con diversi voltaggi applicati.
    Abstract: Резюме Выращивается чистый монокристалл PbI2. Регистрируется спектральное распределение фототока, используя различные лазеры на красителях, в случаеE‖c иE⊥c. Фундаментальный край поглощения возникает при 2.36 эВ (E⊥c). Обнаружена дихроматичность с расщеплением 0.05 эВ. Кривые затухания фототока при различных напряжениях, температурах и интенсивностях облучения используется для вычисления времени жизни носителей заряда. Зависимость фототока от напряжения используется для вычисления концентрации ловушек и подвижности носителей зарядов. При различных приложенных напряжениях исследуются зависимости фототока от интенсивности облучения при частотах, соответствующих краю зоны.
    Notes: Summary Pure PbI2 single crystals have been grown by the zone-refining technique and the spectral distribution of the photocurrent by using different dye-lasers has been recorded withE‖c andE⊥c. The fundamental absorption edge appears at 2.36 eV (E⊥c) and is found to be dichromatic in nature with a splitting of 0.05 eV. The decay pattern of the photocurrent at different voltages, temperatures and intensities of illumination has been used to calculate the lifetimes of charge carriers. The photocurrent-voltage characteristics have been used to calculate the trap concentration and mobility of the charge carriers. The lux-ampère characteristics at the band edge frequency have been studied at different applied voltages.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Mycopathologia 102 (1988), S. 179-184 
    ISSN: 1573-0832
    Keywords: aspergillosis ; clinical signs ; haematology ; quails
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Intratracheal inoculation of 2-week-old quail chicks with Aspergillus fumigatus resulted in the development of clinical signs within 24 h of infection. These were characterized by anorexia, depression, accelerated respiration and gasping followed by death. The acute course of the disease lasted for 7–10 days followed by recovery in the surviving chicks. The overall mortality during a 6-week observation period was 20%. Although the mean body weight of A. fumigatus infected quail chicks continued to be slightly lower throughout the experiment but the difference, in comparison to controls, was not significant except at 42 days post-infection. There was no appreciable difference in the mean values of Hb, TEC, PCV, MCV, MCH and MCHC between the infected and control chicks at any stage of infection but TLC revealed a leucocytosis from 2–7 days which was the result of increase in the relative percentage of heterophils and decrease in lymphocytes.
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  • 8
    ISSN: 1573-0832
    Keywords: Aspergillosis ; quails ; pathology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Intratracheal inoculation of young quail chicks with Aspergillus fumigatus spores resulted in the development of characteristic gross and microscopic lesions. The lesions were restricted to respiratory tract and there was no dissemination of infection to other tissues of the body. Gross changes in lungs and air sacs were observed within 24 hours and continued up to 20 days while in trachea these were noticed from the 3rd to the 9th day post-infection. The lesions, in general, included congestion and focal haemorrhages in the first 2 days followed by the development of varying-sized greyish-white nodules in the lungs, air sacs and trachea. Microscopic changes consisted of congestion, haemorrhages and a diffuse cellular infiltration in the first 2 days followed by granulomatous reaction with well developed granulomas in lungs, air sacs and trachea. Spores and developing hyphae of Aspergillus could be demonstrated in sections from 24 hours to 20 days of infection. Reisolation of the fungus was consistently achieved from the lungs, air sacs and trachea up to 14 days.
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  • 9
    ISSN: 1573-1561
    Keywords: Furocoumarins ; psoralen ; 5-methoxypsoralen ; 8-methoxypsoralen ; phototoxicity ; photobiological assay ; celery ; carrot ; analysis ; umbelliferous seeds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The application of an ultrasensitive photobiological assay which detects photosensitizing furocoumarins with sensitivities as high as 1 × 10−11 g is discussed in relation to these molecules as phytoalexins. Examples of the utilization of this technique, verified by both HPLC and TLC, are the analyses of healthy and diseased celery and carrots, dry seeds, plant extracts and oils, and whole plants and leaves. The usefulness of this method in following the metabolic detoxification of furocoumarins is also illustrated. The extreme sensitivity of the test has permitted the detection, for the first time, of both 5-methoxypsoralen and 8-methoxypsoralen in fresh carrot roots.
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  • 10
    Publication Date: 1991-12-01
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
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