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  • 1
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Al0.5In0.5P/Ga0.5In0.5P superlattice structures have been investigated as multiquantum barriers (MQB) in 630 nm band laser diodes in order to reduce thermal current losses. By inserting an optimized MQB, we have succeeded in improving both threshold currents and characteristic temperatures of such devices. However, the optimized dimensions of the MQB found experimentally deviated strongly from those predicted theoretically, indicating that the commonly used theoretical description assuming effective mass approximation, electron wave interference, and using transfer matrix calculation is not adequate. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 43 (1971), S. 1115-1119 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 51 (1973), S. 248-250 
    ISSN: 1432-1440
    Keywords: Hyperbaric oxygen ; rabbits ; malformation ; Hyperbare Oxygenation ; Fehlbildungen ; Kaninchen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Gravide Kaninchen wurden am 9. Tag der Gestation für 5 Std einem Sauerstoffdruck von 1,5 oder 2,0 absoluten Atmosphären ausgesetzt. Die Druckexposition führte zu einem Anstieg der Resorptionsrate und der Mißbildungsfrequenz.
    Notes: Summary At the 9th day of gestation pregnant rabbits were exposed to an oxygen pressure of 1.5 or 2.0 ata (absolute atmospheres) for 5 hours. The mother rabbits were killed on the 29th day of pregnancy. The foetuses were removed and the uteri studied for resorptions. After macroscopic inspection, skeleton preparations were made and inspected for malformations. The results were compared with untreated controls. Hyperbaric oxygen resulted in increased resorption rate and number of malformations.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Fetale Chirurgie ; Kopf-Hals-Chirurgie ; Fetendo ; Endoskop ; Kongenitale Zwerchfellhernie ; Larynxatresie ; Lippen-Kiefer-Gaumen-Spalte ; Fetale Wundheilung ; Key words Fetal endoscopic surgery ; Head and neck surgery ; Congenital diaphragmatic hernia ; Laryngeal atresia ; Cleft lip and palate ; Fetal wound healing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Fetal surgery is defined as the intrauterine surgical correction of malformations that endanger the unborn child’s life in prenatal stages of development or lead to death or severe damage of the child postnatally. Such surgery is a clinical reality now. Indications for intrataurine surgical procedures also exist for head and neck abnormalities, especially in the upper respiratory tract. These include exposure and temporary obstruction of the fetal trachea for correction of pulmonary hypoplasia in cases with congenital diaphragmatic hernias, prenatal tracheotomy in cases of laryngeal atresia for the correction of lethal pulmonary overdistension, and resection of embryonic tumors that obstruct the respiratory tract. The relatively high surgical risk resulting in particular from preterm labor occurring postoperatively may be reduced by employing minimally invasive techniques. Endoscopic procedures render opening of the uterus unnecessary and are of particular importance. In part of the procedures, only endoscopic surgery has led to therapeutic success rates justifying its clinical use. Further reduction of the operative risk suggests prenatal interventions, even in cases with non-lethal conditions. More diseases of the head and neck may thus be included in the spectrum of indications. One example is prenatal correction of a cleft lip and palate, which until now has only been performed in animal experiments. The particular characteristics of fetal wound healing allow this to take place without scarring up to a certain stage in pregnancy. This offers the prospect of a surgical correction that is invisible externally and avoids growth-impeding scars. The particular ethical and legal aspects of fetal surgery are discussed.
    Notes: Zusammenfassung Fetale Chirurgie bedeutet die Durchführung von operativen Eingriffen am Ungeborenen mit dem Ziel der intrauterinen Korrektur von Mißbildungen, die das Leben des Kindes bereits pränatal gefährden oder die postnatal den Tod oder eine schwere Schädigung des Kindes zur Folge haben. Auch im Kopf-Hals-Gebiet, insbesondere im Bereich der oberen Luftwege, gibt es bereits Indikationen für fetale Eingriffe. Diese umfassen die Darstellung und vorübergehende Obstruktion der fetalen Trachea zur Rückführung der pulmonalen Hypoplasie bei kongenitaler Zwerchfellhernie, die pränatale Tracheotomie bei Larynxatresie zur Rückführung einer letalen Lungenüberblähung und die Resektion embryonaler atemwegsobstruierender Tumore. Das relativ hohe Operationsrisiko, daß sich vor allem aus den postoperativ regelmäßig auftretenden vorzeitigen Wehen ergibt, läßt sich durch den Einsatz minimal-invasiver Techniken verringern. Endoskopischen Verfahren, die die langstreckige Eröffnung des Uterus überflüssig machen, kommt dabei eine besondere Rolle zu. Bei einem Teil der Eingriffe führte erst die endoskopische Durchführung zu therapeutischen Erfolgsquoten, die eine klinische Etablierung rechtfertigen. Durch weitere Risikominimierung könnten Nutzen und Risiko eines pränatalen Eingriffs auch bei nicht lebensbedrohlichen Mißbildungen in einem verantwortbaren Verhältnis stehen und damit weitere Erkrankungen aus dem Kopf-Hals-Bereich in das Indikationsspektrum rücken. Ein Beispiel für eine solche, bisher nur im Tierversuch etablierte Option ist die pränatale Korrektur der Lippen-Kiefer-Gaumen-Spalte. Durch die besonderen Eigenschaften der fetalen Wundheilung, die bis zu einem bestimmten Schwangerschaftsabschnitt narbenfrei abläuft, böte sich die Perspektive einer äußerlich unsichtbaren Korrektur und fehlenden wachstumshemmenden Narbenzügen. Ergänzend wird auf die besonderen ethischen und rechtlichen Aspekte der fetalen Chirurgie eingegangen.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 7 (1974), S. 224-224 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The clastering of point defects in γ-irradiated LiF single crystals was investigated by measuring the small-angle X-ray scattering after various γ doses.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 207-209 (Feb. 1996), p. 365-368 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 225-227 (July 1996), p. 745-750 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 235-238 (Oct. 1996), p. 699-704 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-0827
    Keywords: Key words: Microscopy — Confocal methods — Bone — Human — Osteocytes.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Microscopy of bony tissue usually requires special treatment for decalcification and processing of thin sections. Confocal laser scanning microscopy (CLSM) allows the nondestructive histotomography of organic hard tissue. The aim of this study was to visualize healthy human bone structures and to correlate identical areas in CLSM and conventional light microscopy. Each sample of healthy human lower jaw (n = 20) was divided into three parts: (1) fresh, untreated bony blocks studied by CLSM; (2) MMA-embedded thin sections (without decalcification), HE stained and studied by CLSM and conventional light microscopy (correlation of identical areas); (3) decalcificated, HE stained, histological sections studied by conventional light microscopy. In untreated bony blocks, microstructures such as osteocytes and lamellae were identified by CLSM. These structures could be correlated with conventional light microscopy. In CLSM, subcellular structures cannot yet be interpreted, whereas cytoplastic processes of osteocytes were seen with high contrast. With CLSM, nondestructive histology of cortical bone can be obtained. The risk of artifacts due to pretreatment is minimized, and subsurface visualization does not affect the interpretation.
    Type of Medium: Electronic Resource
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