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  • Articles: DFG German National Licenses  (5)
  • Intestinal tract  (2)
  • oxidative dehydrogenation  (2)
  • EC granule  (1)
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  • Articles: DFG German National Licenses  (5)
Material
Years
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Promoting effect of carbon dioxide on the dehydrogenation and aromatization of ethane over gallium‐loaded catalysts (2000)
    Springer
    Catalysis letters 64 (2000), S. 215-221 
    Details
    ISSN: 1572-879X
    Keywords: gallium oxide ; titanium oxide ; carbon dioxide ; oxidative dehydrogenation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ga2O3 and Ga2O3/TiO2 catalysts were found to be effective agents for the dehydrogenation of ethane to ethene in the presence of carbon dioxide at 650 °C. The activity of the Ga2O3 and Ga2O3/TiO2 catalysts in the presence of CO2 was 2–4 times higher than that without CO2. Ethene yields reached ca. 20–25% and selectivity was ca. 70–90% at 650°C in the 17% ethane and 83% CO2 feed at an SV of 9,000 ml/(g‐cat h). The presence of CO2 markedly promoted dehydrogenation of ethane over Ga2O3 and Ga2O3/TiO2 catalysts. Furthermore, the promoting effect of CO2 on the aromatization of ethane and ethene over a Ga2O3+H/ZSM‐5 catalyst was also observed above 650 °C. Aromatics yields were higher than those without CO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019047306179
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dehydrogenation of isopropylbenzene with vanadium-oxide-loaded activated carbon catalyst in the presence of carbon dioxide (2000)
    Springer
    Catalysis letters 69 (2000), S. 59-64 
    Details
    ISSN: 1572-879X
    Keywords: dehydrogenation ; oxidative dehydrogenation ; cumene ; α-methylstyrene ; vanadium oxide ; activated carbon ; temperature-programmed reduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Dehydrogenation of isopropylbenzene to α-methylstyrene was carried out using various supported metal oxide catalysts in the presence of carbon dioxide. An activated carbon-supported vanadium oxide catalyst afforded a high activity in carbon dioxide atmosphere: the α-methylstyrene yield in carbon dioxide atmosphere was two times greater than that in an argon atmosphere at 723 K. In order to investigate the role of carbon dioxide in this reaction, we carried out temperature-programmed reduction (TPR) studies using both fresh and used catalysts. The TPR profiles clearly indicate that carbon dioxide could keep the surface of vanadium oxide at a high oxidation state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019084915149
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dedifferentiated leiomyosarcoma of the intestinal tract: histological, ultrastructural and immunohistochemical examinations (1992)
    Springer
    Virchows Archiv 420 (1992), S. 313-320 
    Details
    ISSN: 1432-2307
    Keywords: Dedifferentiated leiomyosarcoma ; Intestinal tract ; Dedifferentiated element ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Six cases of dedifferentiated leiomyosarcoma of the small and large bowel are presented with histological, ultrastructural and immunohistochemical examination. One case arose in the jejunum, two in the ileum, and the other three in the large intestine. The tumours were submucosal in four cases with large areas of ulceration; two were polypoid. Four tumours showed typical leiomyosarcomatous appearance with dedifferentiated components and two were typical leiomyosarcomas at the primary site with differentiated components only in metastatic foci. By immunohistochemistry, typical leiomyosarcomatous areas showed a positive reaction for muscle-specific actin (MSA), MB1, MB2 and myosin. In contrast, desmin-positive cells were scattered throughout the tumour or were not present. Tumour cells in dedifferentiated components were positive for alpha-1-antitrypsin and alpha-1-antichymotrypsin in all cases but one; neuron specific enolase, MB1, MB2 and myosin were positive with variety. MSA was faintly positive in only a few tumour cells of two cases and desmin was not detected in any of the cases studied. Ultrastructurally, tumour cells in typical leiomyosarcomatous areas demonstrated evident smooth muscle features, although in dedifferentiated areas they lacked such features except in one case. Our results indicate that dedifferentiated elements may derive from ordinary leiomyosarcoma and loose muscle features due to dedifferentiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01600210
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrastructural demonstration of calcitonin in osmium-fixed human medullary carcinoma of thyroid by the protein A-colloidal gold technique (1985)
    Springer
    Virchows Archiv 407 (1985), S. 407-417 
    Details
    ISSN: 1432-2307
    Keywords: Thyroid medullary carcinoma ; Calcitonin ; EC granule ; Serotonin ; Protein A-colloidal gold
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In two medullary carcinomas of the thyroid gland two types of secretory granules were found electron microscopically in the cytoplasm of the tumour cells. The sizes of the granules in one case ranged 103–345 nm in diameter; they were round in shape, and they co-existed in the same tumour cell. They could not, therefore, be distinctively subdivided into two types. In another case, secretory granules in the cytoplasm closely resemble EC granule in morphology. Using the protein A-colloidal gold (PAG) technique the content of secretory granules could be identified as calcitonin irrespective of their sizes or morphology. Immunoreactivity at the ultrastructural level was fairly well preserved even in the osmium-fixed tumour cells. The labelling index, expressed as a mean number of gold particles per unit square area of the secretory granule, was higher in the non-osmium-fixed tumour cells than in the osmium-fixed. Non-osmium-fixed tumour cells embedded either in epoxy or methacryl resin were almost equally labelled with gold particles. The result indicates that the PAG method is practicable to demonstrate the ultrastructural localization of calcitonin even in the osmium-fixed, epoxy resin embedded material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00709987
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Epithelioid angiosarcoma of the intestinal tract with endothelin-1-like immunoreactivity (1993)
    Springer
    Virchows Archiv 423 (1993), S. 309-314 
    Details
    ISSN: 1432-2307
    Keywords: Angiosarcoma ; Intestinal tract ; JC70 ; Endothelin ; Epithelioid angiosarcoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Two rare cases of intestinal epithelioid angiosarcoma arising in the sigmoid colon and small intestine are reported. The small intestinal tumours were located in the duodenum and upper jejunum. All tumours showed reddish-black protuberant masses with comparatively clear margins. Histology reveals solid and epithelioid growth of large polygonal cells, mimicking undifferentiated carcinoma. Vascular differentiation such as lumina containing red cells and intracytoplasmic vacuolization is noticed. Intense immunoreactivity toUlex europaeus agglutinin I and JC70 (CD31), and sporadic positive reaction to factor VIII related antigen were detected in one case but not in the other. However, both tumours have cells which show intense endothelin-1 immunoreactivity. Positive immunostaining occurred with low molecular weight keratins suggesting epithelial differentiation and suggested epithelioid angiosarcoma as a diagnosis, a specific entity within angiosarcoma. Because of their histological features, epithelioid angiosarcomas may be confused with undifferentiated carcinomas. Endothelin-1-like immunoreactivity seems to be a good marker for this type of angiosarcoma, even when the tumour cells lack usual marker substances for endothelial cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01606896
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    Paper (German National Licenses)
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