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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Tetrahedron 46 (1990), S. 775-782 
    ISSN: 0040-4020
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 41 (1985), S. 527-528 
    ISSN: 1420-9071
    Keywords: Time-lapse film ; flow-through chamber ; oogenesis ; embryogenesis ; insects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A simple flow-through chamber for time-lapse film analysis of developing organisms has been constructed. The medium is replaced efficiently and uniformly in the chamber which is, therefore, ideally suited for studying the effect of various drugs on development.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Tetrahedron Letters 30 (1989), S. 1797-1798 
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-041X
    Keywords: Insect embryogenesis ; Pattern formation ; Double abdomen ; UV irradiation ; Photoreversal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The pattern anomaly double abdomen was induced in embryos of Bradysia tritici (syn. Sciara ocellaris) by irradiation of the anterior egg pole with far UV (254 or 285 nm) using low UV fluences. The maximum yield of 18% of double abdomens was obtained when 2.5 h embryos were irradiated (late intravitelline cleavage stage); earlier irradiation failed to yield double abdomens, as did irradiations after the early syncytial blastoderm stage. Exposing irradiated embryos to photoreverting light (366 nm) reduced the yield of malformations. Most double abdomens were symmetrical and the number of segments ranged from 3 to 8 in each set, with the mean value at 6.4 segments.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-041X
    Keywords: Apis mellifera ; Oogenesis ; Germ-line cells ; Fusomes ; Microfilaments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Oogenesis is known to be important for embryonic pattern formation. For this reason we have studied the early differentiation of the honeybee ovariole histologically, ultrastructurally, and by staining F-actin with rhodaminyl-phalloidin. At the anterior tip of the ovariole, stem cells are lined up in a single file; they are organelle-poor but contain characteristic electrondense bodies with lysosomal properties. The presence of these bodies in cystocytes as well as prefollicle cells indicates that both cell types may be derived from the apical stem cells. During later stages of oogenesis, the follicle cells differentiate cytologically in different regions of the follicle. The organization of the intercellular bridges between cystocytes derived from a single cystoblast has been studied in detail. The polyfusomes in the intercellular bridges of cystocyte clusters stain with rhodaminyl-phalloidin and hence contain F-actin. Later, when the polyfusomes begin to desintegrate, F-actin rings form which line the rims of the intercellular bridges. Actin might be recruited from conspicuous F-actin stores which were detected in the germ-line cells. The F-actin rings are dissembled some time before the onset of vitellogenesis when the nurse chamber has grown to a length of about 200 μm. At the basal side of the follicle cells (close to the basement membrane facing the haemocdele) parallel microfilament bundles encircle the ovariole. The microfilament bundles which are oriented mostly perpendicular to the long axis of the ovariole were first observed around the zone where the cystocyte divisions occur; after this phase the micro-filament bundles become organized differently in the follicle cells associated with the nurse cells and in the follicular epithelium of the oocyte.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 37 (1981), S. 1192-1193 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The morphology of ovarian follicles in the temperature-sensitive female-sterile mutantl(1)su(f) mad-ts has been studied by means of light and electron microscopy. As the follicle cells gradually degenerate at the restrictive temperature (29°C) the follicles become increasingly disorganized with respect to shape and polarity.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0878
    Keywords: Follicle cells ; Intercellular space ; Microfilaments ; Dysdercus intermedius (Insecta) ; Apis mellifera (Insecta)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The somatic epithelia of Dysdercus and Apis follicles were analyzed by electron microscopy, and the patterns of F-actin and microtubules were studied by fluorescence microscopy. The epithelia in both species differ considerably in shape and in the organization of the cytoskeleton. During previtellogenic stages, the epithelium consists of columnar-shaped cells with small (Dysdercus) or no (Apis) lateral intercellular spaces. During vitellogenesis, the follicle cells round up; the intercellular spaces increase in size in Dysdercus follicles, whereas in Apis follicles they remain small. Along the basal surface of the follicle cells, there are conspicuous parallel bundles of microfilaments perpendicular to the anteroposterior axis of the follicles. In the honeybee, these microfilament bundles are present in long filopodia, most of which are embedded in thickenings of the basement membrane and extend over the surfaces of neighbouring cells. In the cotton bug, the basal surface of the follicle cells is thrown into parallel folds. The microfilament bundles are located just underneath the cell membrane where the folds contact the basement membrane. In the polar regions of the Dysdercus follicle, the epithelial cells become flat and adhere to each other without forming intercellular spaces. The basement membrane is particularly thick in the polar areas; this has also been observed in Apis follicles around the intercellular bridge connecting oocyte and nurse cells.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 323 (1968), S. 124-141 
    ISSN: 1435-2451
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Während die operative portokavale Anastomose als Intervalloperation nach einer Oesophagusvaricenblutung heute allgemeien befürwortet wird, ist die prophylaktische oder als Noteingriff in der Blutung durchgeführte Shuntoperation noch umstritten. Im eigenen Krankengut wurde bei 31 Pat. wegen konservativ nicht beherrschbarer Oesophagusvaricenblutung Pfortader und Hohlvene anastomosiert. 15 Operierte haben den Eingriff überlebt und konnten nach Hause entlassen werden. Von 16 postoperativ Verstorbenen wiesen vier Fälle gleichförmige infarktartige Nekrosen in der periportal bzw. postnekrotisch geschrumpften Leber auf. Diese ungewöhnlichen lokalisierten Nekrosen sind auf eine Ischämie zu beziehen, deren Ursache morphologisch aber nicht zu klären ist. Unter berücksichtigung von Anamnese, Therapie und Verlauf wird in einer eingehenden Besprechung versucht, diejenigen Faktoren zu eruieren, die für die Entstehung der eigentümlichen Lebernekrosen verantwortlich sein könnten. Eine bestimmte Ursache ist nicht zu ermitteln, wahrscheinlich sind mehrere Faktoren im Spiele.
    Notes: Summary Whilst the operative porto-caval anastomosis as interval operation after a haemorrhage of the oesophageal varices is generally recommended to-day, prophylactic Shunt-operation, or the one performed as emergency intervention during the haemorrhage, is still controversial. In our own number of cases portal vein and vena cava were anastomosed in 31 patients because of haemorrhage of the oesophageal varices, which could not be controlled conservatively. 15 operated cases survived the intervention and could be discharged home. Of 16 post-operative deaths, 4 cases showed uniform infarction-like necroses in the periportal area of the liver which is shrunken after necrosis. These unusual localized necroses have to be related to an ischaemia, the cause of which, however cannot be clarified morphologically. Considering the history, treatment, and progress an attempt will be made, in a detailed discussion, to investigate those factors which could be responsible for the origin of the peculiar necroses of the liver. A definite cause cannot be ascertained, several factors are probably involved.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 177 (1875), S. 344-387 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 240 (1887), S. 243-244 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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