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  • 1
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  69. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC), Joint Meeting mit der Mexikanischen und Kolumbianischen Gesellschaft für Neurochirurgie; 20180603-20180606; Münster; DOCV014 /20180618/
    Publication Date: 2018-06-19
    Keywords: ddc: 610
    Language: English
    Type: conferenceObject
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Ultramicroscopy 42-44 (1992), S. 838-844 
    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
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  • 3
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  70. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC), Joint Meeting mit der Skandinavischen Gesellschaft für Neurochirurgie; 20190512-20190515; Würzburg; DOCP167 /20190508/
    Publication Date: 2019-05-09
    Keywords: ddc: 610
    Language: English
    Type: conferenceObject
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  • 4
    ISSN: 1279-8517
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1615-6102
    Keywords: Oomycetes ; Pythium ; Phytophthora ; Monoclonal antibodies ; Surface antigens ; Immunocytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The oomycetes are a class of protists that produce biflagellate asexual zoospores. Members of the oomycetes have close phylogenetic affinities with the chromophyte algae and are widely divergent from the higher fungi. This review focuses on two genera,Phytophthora andPythium, which belong to the family Pythiaceae, and the order Peronosporales. These two genera contain many species that cause serious diseases in plants. Molecules on the surface of zoospores and cysts of these organisms are likely to play crucial roles in the infection of host plants. Knowledge of the properties of the surface of these cells should thus help increase our understanding of the infection process. Recent studies ofPhytophthora cinnamomi andPythium aphanidermatum have used lectins to analyse surface carbohydrates and have generated monoclonal antibodies (MAbs) directed towards a variety of zoospore and cysts surface components. Labelling studies with these probes have detected molecular differences between the surface of the cell body and of the flagella of the zoospores. They have been used to follow changes in surface components during encystment, including the secretion of an adhesive that bonds the spores to the host surface. Binding of lectin and antibody probes to the surface of living zoospores can induce encystment, giving evidence of cell receptors involved in this process. Freeze-substitution and immunolabelling studies have greatly augmented our understanding of the synthesis and assembly of the zoospore surface during zoosporogenesis. Synthesis of a variety of zoospore components begins when sporulation is induced. Cleavage of the multinucleate sporangium is achieved through the progressive extension of partitioning membranes, and a number of surface antigens are assembled onto the zoospore surface during cleavage. Comparisons of antibody binding to many isolates and species ofPhytophthora andPythium have revealed that surface components on zoospores and cysts exhibit a range of taxonomic specificities. Surface antigens or epitopes may occur on only a few isolates of a species; they may be species-specific, genus-specific or occur on the spores of both genera. Spore surface antigens thus promise to be of significant value for studies of the taxonomy and phylogeny of these protists, as well as for disease diagnosis.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— Tooth eruption is a localized, bilaterally symmetrical series of events which involves resorption and formation of alveolar bone on opposite sides of the tooth and requires the presence of the dental follicle. We examined the effect on eruption of selective surgical removal of parts of the follicle. Removal of either the basal or coronal halves of the follicle prevented eruption. Bone resorption and formation of an eruption pathway did not occur after removal of the coronal part of the follicle and bone formation did not occur after removal of the basal part of the follicle. Exposure and incisions of the follicle had no effect on eruption. We interpret these data to mean that the polarized resorption and formation of alveolar bone that occur around a tooth during eruption are regulated by the adjacent parts of the dental follicle.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The dental follicle is a loose connective tissue layer that surrounds the developing and erupting tooth. The follicle is necessary for tooth eruption in dogs and specific cellular changes occur in the follicle at the onset of tooth eruption, in particular, within the coronal region of the follicle next to areas of subsequent bone resorption there is an increase in mononuclear cells which have the ultrastructure features of monocytes and contain specific granules characteristic of preosteoclasts. The follicle has an extensive microvasculature and monocytes are often seen adjacent to capillaries and venules. Monocytes increase in number in direct proportion to the increase in osteoclasts that form the eruption pathway and decrease in number as soon as this activity is completed. It is postulated that monocytes enter the follicle from the microvasculature and then migrate to the walls of the bony crypt to participate in the formation of the eruption pathway.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fully-coherent Si0.7Ge0.3 layers were deposited on Si(001) by gas-source molecular beam epitaxy (GS-MBE) from Ge2H6/Si2H6 mixtures in order to probe the effect of steady-state hydrogen coverages θH on surface morphological evolution during the growth of compressively strained films. The layers are grown as a function of thickness t at temperatures, Ts=450–550 °C, for which strain-induced roughening is observed during solid-source MBE (SS-MBE) and deposition from hyperthermal beams. With GS-MBE, we obtain three-dimensional (3D) strain-induced growth mounds in samples deposited at Ts=550 °C for which θH is small, 0.11 monolayer (ML). However, mound formation is dramatically suppressed at 500 °C (θH=0.26 ML) and completely eliminated at 450 °C (θH=0.52 ML). We attribute these large differences in surface morphological evolution primarily to θH(Ts)-induced effects on film growth rates R, adatom diffusion rates Ds, and ascending step-crossing probabilities. GS-MBE Si0.7Ge0.3(001) growth at 450 °C remains two dimensional, with a surface width 〈w〉〈0.15 nm, at all film thicknesses t=11–80 nm, since both R and the rate of mass transport across ascending steps are low. Raising Ts to 500 °C increases R faster than Ds leading to shorter mean surface diffusion lengths and the formation of extremely shallow, rounded growth mounds for which 〈w〉 remains essentially constant at (similar, equals)0.2 nm while the in-plane coherence length 〈d〉 increases from (similar, equals)70 nm at t=14 nm to 162 nm with t=75 nm. The low ascending step crossing probability at 500 °C results in mounds that spread laterally, rather than vertically, due to preferential attachment at the mound edges. At Ts=550 °C, the ascending step crossing probability increases due to both higher thermal activation and lower hydrogen coverages. 〈w〉(t) increases by more than a factor of 10, from 0.13 nm at t=15 nm to 1.9 nm at t=105 nm, while the in-plane coherence length 〈d〉 remains constant at (similar, equals)85 nm. This leads, under the strain driving force, to the formation of self-organized 3D {105}-faceted pyramids at 550 °C which are very similar to those observed during SS-MBE. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Clinical Anatomy 7 (1994), S. 300-300 
    ISSN: 0897-3806
    Keywords: Life and Medical Sciences ; Miscellaneous Medical
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-7330
    Keywords: endometriosis ; unexplained infertility ; ovulatory dysfunction ; in vitro fertilization ; natural cycles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Purpose: The impact of endometriosis and unexplained infertility on follicular function and fertilization of oocytes in cycles totally unperturbed by exogenous gonadotrophins, when compared with controls with tubal damage, were examined. Methods: In natural cycles, without any exogenous gonadotropins, endocrine and ultrasonographic studies of follicular maturation in 18 women with minor endometriosis (41 cycles), 15 women with unexplained infertility (31 cycles), and 34 women with tubal damage (88 cycles) were performed. Results: The endometriosis group had a significantly longer follicular phase (median: 15,13, and 13 days). Both endometriosis and unexplained infertility had significantly reduced LH concentrations in follicular fluid compared with tubal damage (median: 12.1, 11.5, and 15.9 IU/L, respectively). Endometriosis was associated with a significantly reduced fertilization rate compared with unexplained infertility or tubal damage (46, 65, and 69%, respectively). Conclusions: These data show continuing evidence of ovulatory dysfunction leading to reduced fertilization rates in women with minor endometriosis.
    Type of Medium: Electronic Resource
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