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  • 1
    Electronic Resource
    Electronic Resource
    Investigation of the nucleation mechanism in bias-enhanced diamond deposition (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 22-24 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline diamond films were deposited in a MW-PECVD reactor employing bias-enhanced nucleation as pretreatment to promote the subsequent diamond nucleation. The substrate temperature during the bias-enhanced nucleation was varied between 600° and 760 °C by external heating, while the other deposition parameters namely the microwave input power were kept constant. Likewise, the deposition parameters were not changed in the subsequent diamond growth period throughout the experiment. The films formed during the bias-enhanced nucleation were analyzed employing electron energy loss spectroscopy (EELS) and scanning electron microscopy (SEM). The nuclei density (ND) obtained for good quality diamond crystals after the nucleation step and an additional growth period increases considerably from 1×106 cm−2 or less to 1×1010 cm−2 in a narrow temperature range between 670 and 700 °C. For temperatures exceeding 700 °C continuous films are formed. The structure of the pretreatment deposit also undergoes considerable changes: the intensity of the diamond plasmon increases with the substrate temperature, which is indicative of an increase in the concentration of diamond crystallites embedded in an otherwise amorphous carbon matrix. Our experiments suggest that diamond crystallites formed during the pretreatment serve as nucleation centers for the subsequent diamond growth. We can also conclude that the variation in the substrate temperature rather than the changes in the microwave input power or, respectively, plasma chemistry, drive the observed structural changes and increase in ND. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116743
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of submicrometer ferroelectric particles by wet-chemical methods (1994)
    s.l. : American Chemical Society
    Langmuir 10 (1994), S. 3357-3361 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00021a073
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  • 3
    Electronic Resource
    Electronic Resource
    Formation of overwintering structures of Uncinula necator and colonization of grapevine under field conditions (2002)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 51 (2002), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Developing shoots of grapevine (Vitis vinifera cv. Kerner) were inoculated with conidia of the powdery mildew, Uncinula necator, at well-defined phenological stages of the host to provoke the development of flag shoots in the field and to investigate these shoots as early as possible in the following growing season for the presence of the pathogen. The disease progress was monitored and fungal growth and development on samples from a field trial were analysed by means of low-temperature scanning electron microscopy (LT–SEM). Mycelium was detected on the surface and in the interior parts of buds. The suitability of the field plot to analyse flag shoots was proven by the occurrence of such shoots in the following spring. Furthermore, early stages of cleistothecia development on berries were described for the first time. Establishment of U. necator in dormant buds of grapevine, giving rise to flag shoots in the following spring, is considered to play a significant role in overwintering of the pathogen in the vineyards of southern Germany.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.2002.00694.x
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  • 4
    Electronic Resource
    Electronic Resource
    Localized trichorrhexis nodosa (1992)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 127 (1992), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1992.tb14884.x
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  • 5
    Electronic Resource
    Electronic Resource
    Haemoglobin crystals in the midgut of the tick Ornithodorus moubata Murray (1977)
    [s.l.] : Nature Publishing Group
    Nature 266 (1977), S. 536-538 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] O. moubata porcinus ticks (males and females) were taken from the laboratory strain, fed on guinea-pigs and dissected at intervals after the blood meal (0, 2, 4, 6, 12, 15, 30, 85 and 200 d), in 0.7% NaCl solution (for X-ray diffraction and spectroscopy) or without a dissecting fluid (for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/266536a0
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  • 6
    Electronic Resource
    Electronic Resource
    Scanning tunneling and scanning electron microscopy on high-T"c superconductors
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 153-155 (1988), S. 1000-1001 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0921-4534(88)80195-3
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  • 7
    Electronic Resource
    Electronic Resource
    Scanning tunneling and scanning electron microscopy investigations of nonuniform surfaces
    Amsterdam : Elsevier
    Ultramicroscopy 25 (1988), S. 129-133 
    Details
    ISSN: 0304-3991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-3991(88)90220-3
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  • 8
    Electronic Resource
    Electronic Resource
    Rasterelektronenmikroskopische Befunde an netzhautinnenflächen (1977)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 204 (1977), S. 31-37 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The findings by scanning and transmission electron microscopy of multiple glial excrescences from the retina into the cortical vitreous body are described. These formations are located in lines above superficial retinal vessels. The findings are compared with those from light microscopy of similar formations. The pathogenesis and the possible significance as retinovitreal attachments for rhegmatogenous defects of the retina and for posterior vitreous detachments are discussed.
    Notes: Zusammenfassung Es werden die rasterelektronenmikroskopischen Befunde und die elektronenmikroskopischen Schnittbilder von multiplen, über oberflächlichen Netzhautgefäßen gelegenen Gliaauswüchsen aus der Netzhaut in die Glaskörperrinde beschrieben. Diese Befunde werden mit lichtmikroskopischen Bildern ähnlicher Bildungen verglichen, ihre Pathogenese diskutiert und ihre mögliche Bedeutung als vitreoretinale Adhärenzen für rhegmatogene Netzhautdefektbildungen und hintere Glaskörperabhebung erörtert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02387414
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  • 9
    Electronic Resource
    Electronic Resource
    Rasterelektronenmikroskopische Untersuchungen an fibrösen und fibro-gliösen epiretinalen Fibroplasien (1978)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 207 (1978), S. 229-242 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es werden die rasterelektronenmikroskopischen Befunde von 16 epiretinalen Fibroplasien mit Netzhautfältelung nach verschiedenen primären Funduserkrankungen dargestellt. In diesem ersten Teil besprechen die Autoren: 1. Fibröse, zellfreie epiretinale Membranen mit und ohne strangförmige Glaskörperadhärenzen. Die Fältelung der Retina kommt durch Glaskörpertraktion und Faserbrücken zustande. 2. Fibröse Membranen, welchen einzelne Gliazellen ein- und aufgelagert sind, ohne daß Zellmembranen entstehen. Auch hier wird die Fältelung durch Kollagenfaserbrücken verursacht. 3. Fibröse Membranen, denen gebietsweise Gliamembranen aufgelagert sind. Die Fasermembranen aller drei Typen werden als residuale Glaskörperrinde interpretiert. Weil sie über allen Faltenherden vorhanden sind und wegen ihrem Verhalten zu den Limitansfalten wird angenommen, daß ihre Kontraktion Ursache der Netzhautfältelung ist. Morphologische Anhaltspunkte für Kontraktion von Gliamembranen oder Faserbildung durch die Glia wurden nicht gefunden.
    Notes: Summary The scanning electron microscope was used to examine 16 cases of epiretinal membrane formation and retinal puckers which occurred in a variety of primary retinal disorders. In this first section the authors describe three types of epiretinal membranes: (1) Fibrous acellular membranes with and without vitreous adhesions. Retinal puckering was caused by vitreous traction with collagen strands binding the residual folds. (2) Fibrous membranes containing isolated glial cells. (3) Fibrous membranes partly covered by sheets of glial cells. In all three forms the acellular fibrous component is believed to represent vitreous cortex remnants. The invariable presence of these fibrous membranes at sites of retinal pucker and their relationship to wrinkled internal limiting membrane suggests that contraction of these membranes is responsible for retinal puckering. Morphological evidence of glial membrane contraction and collagen production by glial cells was not found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00431162
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  • 10
    Electronic Resource
    Electronic Resource
    Rasterelektronenmikroskopische Untersuchungen an pigmentierten epiretinalen Fibroplasien (1979)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 210 (1979), S. 109-120 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es werden die licht- und rasterelektronenmikroskopischen Befunde von drei pigmentierten epiretinalen Fibroplasien eines amotiooperierten Auges beschrieben. Es handelt sich um fibro-gliöse Schrumpffaltenherde, deren Epizentrum von einer Schicht aus retinalem Pigmentepithel überlagert wird. Die Zellen zeigen die Oberflächenstrukturen typischer oder leicht degenerativ veränderter Epithelien. Ausgedehnte Gebiete dieser Pigmentepithelmembranen sind pigmentfrei. Anhaltspunkte für direkte oder indirekte Traktion des Pigmentepithels auf die Netzhautinnenfläche liegen nicht vor. Die Herkunft der Zellen und ihre Bedeutung für die Faltenbildung werden diskutiert.
    Notes: Summary The light- and scanning electron microscopic appearance of 3 areas of pigmented epiretinal fibroplasia (pucker) are described in an eye removed following detachment surgery. The centre of each area of pucker consists of a fibroglial sheet covered by retinal pigment epithelium. The surface morphology of these cells resembles typical or slightly degenerated epithelium. Extensive areas of these pigment epithelial sheets were pigmentfree. There was no evidence that the pigment epithelial sheets exerted either direct or indirect traction on the inner surface of the retina. The origin of these cells and their role in the formation of retinal wrinkling is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409997
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