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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of Locally-Ordered Carbon Nanotube Arrays from Patterned Catalyst by Self-Assembly Technique (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 483-486 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Site-selective growth of multi-walled carbon nanotubes (MWCNTs) from an iron oxidenanoparticle catalyst patterned by drying-mediated self-assembly technique is present. The ethanolsolution of the iron nitrate was employed as catalyst precursor. The catalyst precursor was mounted onsilicon wafer by dip-coating. After evaporation of solvent at room temperature, the catalyst patternformed. The catalyst pattern was employed to synthesize carbon nanotube pattern by chemical vapordeposition of ethanol vapor after oxidation of iron nitrate. The patterned array of MWCNTs wasobtained with a dot size of around 5 'm and the distance of about 25 'm. The present method offers asimple and cost-effective method to grow carbon nanotubes with self-assembled patterns
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.483.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Chemical Vapor Deposition Growth of Multi-Walled Carbon Nanotubes on Metallic Substrates (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 101-104 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: A simple thermal chemical vapor deposition (STCVD) growth technique of multi-walledcarbon nanotubes (MWCNTs) is present. Carbon nanotube film was synthesized on the Pt platesubstrates by pyrolysis of ethyl alcohol as carbon source at lower reaction temperature at atmosphericpressure by using simple apparatus. The as-synthesized MWCNTs were characterized by bothscanning electron microscopy (SEM) and high-resolution transmission electron microscopy(HRTEM). The electrical property of an individual MWCNT was evaluated by I-V measurement. Theelectrical resistance of single MWCNT is about 450 k/ in linear region under bias voltage between 2to 4 V. It can undergo a large current of 6 2A at 4 V
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.101.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Carbon Nanotubes Synthesized by Rapid Quenching of Red-Hot Graphite Rod in Ethyl Alcohol (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 93-96 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In order to meet the requirements of various applications, considerable efforts have beenfocused on the new approaches for synthesizing carbon nanotubes. Recently, simple thermalchemical vapor deposition growth technique by pyrolyzing ethyl alcohol has been developed.However, this method needs metallic catalyst. Here, we demonstrate that it is possible to synthesizemulti-walled carbon nanotubes without the aid of any catalyst. The as-synthesized products wereanalyzed by high-resolution transmission electron microscopy (HRTEM). The HRTEM images showthat the products are straight multi-walled carbon nanotubes. The synthesis technique of carbonnanotubes is cost-effective because of the catalyst-free process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.93.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Hyperinsulinaemia accelerates accumulation of cholesterol ester in aorta of rats with transplanted pancreas (1996)
    Springer
    Diabetologia 39 (1996), S. 1276-1283 
    Details
    ISSN: 1432-0428
    Keywords: Keywords Hyperinsulinaemia ; pancreas ; transplantation ; atherosclerosis ; cholesterol.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Hyperinsulinaemia may play a role in the development of atherosclerosis; however, the direct effect of endogenous insulin on the atherosclerotic process is not well understood. To clarify this situation we performed pancreas transplantation with systemic venous drainage in Wistar Shionogi (WS) and Spontaneous Hypertensive (SHR) rats. Both rats received syngeneic pancreaticoduodenal transplants from donor rats. SHR rats were used to observe the additive effects of both hypertension and hyperinsulinaemia on the atherosclerotic process. Peak blood insulin levels after a glucose load were approximately two times higher in transplanted rats than in non-transplanted WS and SHR rats. By contrast, there was no difference in plasma glucose responses between transplanted and non-transplanted rats. Hyperinsulinaemia was not related to dyslipidaemia and hypertension in transplanted rats. Nine months after transplantation, the cholesterol ester contents of the aortas of both WS and SHR transplanted rats were significantly higher than in the control rats (WS: 1.9 ± 1.0 vs 3.8 ± 2.1 mg/g dry tissue, p 〈 0.01; SHR: 1.7 ± 1.3 vs 3.7 ± 1.4 mg/g dry tissue, p 〈 0.05). No differences were demonstrated in the thickness of the intima or in the histology of the aortas of transplanted and control rats. To study the mechanism for cholesterol ester accumulation in the arterial wall, we measured neutral cholesterol ester hydrolase activities in vascular medial smooth muscle cells. Insulin significantly suppressed neutral cholesterol ester hydrolase activities in medial smooth muscle cells. Our results indicate that endogenous hyperinsulinaemia contributes to the development of atherosclerosis by accelerating cholesterol ester accumulation in the arterial wall. [Diabetologia (1996) 39: [1276–1283]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001250050570
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  • 5
    Electronic Resource
    Electronic Resource
    Glycaemic control in pancreatectomized dogs with a wearable artificial endocrine pancreas (1983)
    Springer
    Diabetologia 24 (1983), S. 179-184 
    Details
    ISSN: 1432-0428
    Keywords: Artificial endocrine pancreas ; needle-type glucose sensor ; closed-loop insulin infusion system ; blood glucose control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A needle-type glucose sensor has been developed using a platinum electrode covered with immobilized glucose oxidase. Experiments with albumin-saline solution in vitro showed that at 5.5 mmol/l glucose concentration the output current generated was 1.2±0.4 nA (mean ± SD). The current increased as a linear function of glucose concentration over the range (0–27.7 mmol/l). The response time to reach 90% of the final plateau value was 16.2±6.2 s. The signal-to-noise ratio of the sensor was 15.8±2.6 decibels. The temperature coefficient in output was 2.3±1.0%/°C. The current output was not affected significantly by changes in oxygen tension of the solution in the range 25–150 mmHg. In vivo, the output current of sensors inserted into the subcutaneous tissues of dogs was directly related to blood glucose concentrations after oral glucose or meals. Daily checking of the sensors maintained in subcutaneous tissues in five dogs showed that the sensitivity decreased gradually to 87.2±7.6% at 72 h, and dropped significantly to 57.4±7.0% of the initial output by 96 h. A wearable artificial endocrine pancreas (18.0 × 17.7 × 7.9 cm, 700 g) was developed, consisting of a needle-type glucose sensor, a microcomputer system and a pump driving mechanism. Three pancreatectomized dogs were fitted with the system by inserting the sensor into subcutaneous tissue. By renewing the sensor every fourth day, the device could maintain the daily glucose variations in diabetic dogs within the range 5–9.5 mmol/l for 7 days.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00250158
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  • 6
    Electronic Resource
    Electronic Resource
    Fine structure of bovine morulae and blastocysts in vivo and in vitro (1999)
    Springer
    Anatomy and embryology 199 (1999), S. 519-527 
    Details
    ISSN: 1432-0568
    Keywords: Key words Morphology ; Embryo culture ; Lipid droplet ; Development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The ultrastructure of bovine morulae and blastocysts developed from in vitro-matured and -fertilized oocytes in a serum-supplemented medium was compared with that of morulae and blastocysts collected non-surgically from superovulated cows. In the in vivo-derived morulae, two characteristic cells types could be identified by the electron-density of their cytoplasm and by their ultrastructural features. One type appeared light in color with low electron-dense cytoplasm. These cells were located in the peripheral layer of the cluster of blastomeres, possessed numerous cellular organelles such as mitochondria and Golgi apparatus and had microvilli projecting into the perivitelline space. The other cell type was distinguished by cytoplasm that stained more densely than that of the lighter-appearing cells. The darker-appearing cells generally possessed fewer organelles than the lighter cells, but many lysosome-like structures were present in the cytoplasm. The in vitro-developed morulae also contained two types of cells similar to those observed in the in vivo morulae. However, most of the in vitro-developed cells possessed numerous lipid droplets and contained fewer lysosome-like structures than the cells of the in vivo-derived morulae. The blastocysts, both in vivo and in vitro, showed a clear differentiation of trophoblast cells and inner cell mass (ICM)-cells. In the in vivo-derived blastocyst, the apical membrane of trophoblast cells was covered with large, numerous microvilli and well-developed junctional complexes were observed. Lipid droplets were present in the cytoplasm of trophoblast and ICM-cells but were not abundant. In vitro-developed blastocysts showed less well-developed junctional complexes between trophoblast cells, less well-developed apical microvilli on the trophoblast cells, and contained large numbers of lipid droplets. This accumulation of lipid droplets was higher in the trophoblast cells than in the ICM-cells. The zonae pellucidae of in vitro-developed embryos were thinner than that of the in vivo-derived embryos. This study demonstrates conspicuous differences in the ultrastructural features between the in vivo-derived and in vitro-developed embryos, suggesting that the ultrastructure may reflect the various physiological anomalies observed in previous studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004290050249
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  • 7
    Electronic Resource
    Electronic Resource
    Malignant melanotic neuroectodermal tumor arising from the pineal body (1989)
    Springer
    Acta neuropathologica 77 (1989), S. 654-658 
    Details
    ISSN: 1432-0533
    Keywords: Melanotic neuroectodermal tumor ; Immunohistochemistry ; Ultrastructure ; Pineal origin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case of a melanotic neuroectodermal tumor arising from pineal region of a 4-year-old girl is presented. The tumor had spread diffusely to the meninges, consistent with malignant behavior. Histologically, the tumor consisted primarily of epithelial elements arranged in tubules, cords and nests separated by fibrous vascular tissue in addition to a small neuroblastomatous focus. Melanin pigment was frequently observed in the epithelial tumor cells, and melanin-laden macrophages were also often observed. No teratoid elements were found. Immunohistochemically, tumor cells were positive for neuron-specific enolase but were nonreactive for S-100 protein, epithelial membrane antigen, glial fibrillary acidic protein, vimentin, α-fetoprotein and human chorionic gonadotrophin. Ultrastructurally, the epithelial nature of the tumor cells could be easily demonstrated. In addition, melanosomes in various stages in maturation were observed, indicating melanogenesis of the tumor. On the basis of the tumor location and the histological similarities previously observed for the fetal pineal body, it is very likely that this melanotic epithelial tumor could have originated from the fetal pineal gland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687894
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  • 8
    Electronic Resource
    Electronic Resource
    Acid hydrolase and cytochrome oxidase activities in nitrosourea induced tumors of the nervous system (1977)
    Springer
    Acta neuropathologica 39 (1977), S. 13-23 
    Details
    ISSN: 1432-0533
    Keywords: Nitrosourea ; Glioma ; Schwannoma ; Hydrolases ; Oxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Nitrosourea induced tumors of the nervous system in rats have proven useful for biochemical studies combined with morphological approaches. The pattern of enzyme activities for acid hydrolases and cytochrome oxidase resemble those previously observed in spontaneous nervous system tumors of man. The activities of 4 acid hydrolases were generally high in the gliomas. This could not be attributed solely to zones of regression or necrosis but was a general characteristic of the neoplasms. The activities were predominantly particulate and most likely lysosomal in localization. In schwannomas a similar increase in hydrolases was found in comparison with normal neural tissues but aryl-sulfatase was not increased. Cytochrome oxidase activities were markedly reduced in all tumors studied. The proportionate reduction with respect to normal brain was comparable to that noted in man. No differences were found with respect to fairly well differentiated gliomas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690381
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  • 9
    Electronic Resource
    Electronic Resource
    Argyrophilic glial intracytoplasmic inclusions in multiple system atrophy: immunocytochemical and ultrastructural study (1992)
    Springer
    Acta neuropathologica 84 (1992), S. 273-277 
    Details
    ISSN: 1432-0533
    Keywords: Argyrophilic glial intracytoplasmic inclusions (AGCIs) ; Multiple system atrophy (MSA) ; Oligodendrocytes ; Tau ; Gallyas silver staining
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Argyrophilic intracytoplasmic inclusions in oligodendrocytes (AGCIs) were seen in all of 15 cases of multiple system atrophy (MSA), and none in other neurodegenerative diseases, including 9 cases of Menzel-type olivopontocerebellar atrophy and 4 cases of Joseph's disease. The inclusions were widespread, not only in the olivopontocerebellar and striatonigral systems but also among fibers connecting their affecting lesions of MSA. Immunohistochemically, they were closely associated with tau, tubulins and microtubuleassociated protein 5. Ultrastructurally, they consisted of 30-to 50-nm filaments (not tubules) and electron-dense granules, in varying proportions, and their formation is discussed. The specific occurrence of AGCIs could be a key to approach the pathogenesis of MSA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227820
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of methylcobalamin on protein content in liver and serum of partially hepatectomized rat (1970)
    Springer
    Cellular and molecular life sciences 26 (1970), S. 282-283 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Die Zunahme der Leber- und Serumeiweissmenge bei chronischer Leberstörung von Ratten mit partiel extirpierter Leber wird nach Applikation von Methylcobalamin gefördert. Eine Methylcobalamin induzierte Förderung der Eiweißsynthese in der Leber wird angenommen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01900096
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