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  • 2000-2004  (3)
  • 1995-1999  (10)
  • 2001  (3)
  • 1997  (10)
  • 1
    Digitale Medien
    Digitale Medien
    Axial profile measurement of Alfvén ion cyclotron eigenmodes : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 394-397 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: In the GAMMA10 tandem mirror, a strong ion cyclotron range of frequency heating is performed. As a result of the heating, the Alfvén ion cyclotron (AIC) modes are spontaneously excited due to the strong temperature anisotropy. The AIC modes in the GAMMA10 are excited as the axial eigenmodes and detected at the whole of the device. In the recent experiments, the clear standing wave structure is observed with the magnetic probe measurements. Characteristics of the AIC modes and the measurement of the axial profile are presented. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1309008
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  • 2
    Digitale Medien
    Digitale Medien
    Probe wave system for studying excitation of Alfvén eigenmodes in the ion cyclotron range of frequency : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 398-401 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A probe wave system was constructed for studying the excitation of the Alfvén ion cyclotron (AIC) modes in the anchor cell of the GAMMA 10 tandem mirror. In the central cell, the AIC modes are spontaneously excited as axial eigenmodes due to the strong temperature anisotropy. In the anchor cell, the AIC modes were not observed though the anisotropy is the same as in the central cell. The axial profiles of the magnetic field strength and plasma parameters in the anchor cell are different from those in the central cell. Eigenmodes are excited externally in the AIC frequency range by injecting probe waves. This suggests the AIC modes are unstable in the anchor cell and grow to the detectable level when boundary conditions are realized. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1315638
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  • 3
    Digitale Medien
    Digitale Medien
    Mutant laboratory mice with abnormalities in hair follicle morphogenesis, cycling, and/or structure: annotated tables (2001)
    Copenhagen : Munksgaard International Publishers
    Experimental dermatology 10 (2001), S. 0 
    Details
    ISSN: 1600-0625
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract: Numerous transgenic, targeted mutagenesis (so-called knockouts), conditional (so-called “gene switch”) and spontaneous mutant mice develop abnormal hair phenotypes. The number of mice that exhibit such abnormalities is increasing exponentially as genetic engineering methods become routine. Since defined abnormalities in hair follicle morphogenesis, cycling and/or structure in such mutant mice provide important clues to the as yet poorly understood functional roles of many gene products, it is useful to summarize and classify these mutant mice according to their hair phenotype. This review provides a corresponding, annotated table of mutant mice with hair abnormalities, classifying the latter into 6 categories, 1) abnormally low number of hair follicles, 2) disorders of hair morphogenesis, 3) of hair follicle cycling, 4) of hair follicle structure 5) of sebaceous gland structure, and 6) hair growth disorders as a consequence of immunological abnormalities. This annotated table should serve as a useful source of reference for anyone who is interested in the molecular controls of hair growth, for investigators who are looking for mouse models to explore or compare the functional activities of their gene of interest, and for comparing the hair phenotype of newly generated mouse mutants with existing ones.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1034/j.1600-0625.2001.100601.x
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  • 4
    Digitale Medien
    Digitale Medien
    Fluorescence replication banding of frog chromosomes (1997)
    Springer
    Cellular and molecular life sciences 53 (1997), S. 73-77 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Key words. Late replication banding; DAPI; actinomycin D; frogs.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract. To identify individual chromosomes of a frog karyotype by their fluorescence banding patterns, chromosomes were stained with actinomycin D and 4,6-diamidino-2-phenylindole (DAPI) after incorporation of BrdU during the late S-phase. The chromosomes of three Rana species which were selected for this study (R. ridibunda, R. lessonae and R. japonica) showed well-defined late replication bands. The fluorescence patterns obtained were the reverse of those produced by a 4Na-EDTA Giemsa-staining technique. Fluorescence patterns of the two water frog species (R. ridibunda and R. lessonae) were similar to each other, except for the different fluorescence of the centromeric heterochromatin, which gave extremely bright signals in R. ridibunda but no signal in R. lessonae. Experiments also showed differences between the fluorescence patterns of R. lessonae chromosome 13 in the Italian and Luxembourgian populations. These results sho w that the fluorescence replication banding using actinomycin D and DAPI is very effective in identifying individual frog chromosomes and detecting their structural changes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00000582
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  • 5
    Digitale Medien
    Digitale Medien
    A possibility for new evaluating method of cytotoxicity by using heat shock protein assay (1997)
    Springer
    Journal of materials science 8 (1997), S. 143-147 
    Details
    ISSN: 1573-4838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Technik allgemein
    Notizen: Abstract To determine whether heat shock proteins can be utilized as a biomarker for cytotoxicity of dental materials the induction of synthesis of heat shock proteins by mercuric chloride was examined. To analyse the synthesis of heat shock proteins, HeLa cells were labelled with [35S] methionine, and the labelled proteins were separated by SDS-PAGE and autoradiographed. Incubation of the cells in a medium containing 1.25 to 40 μM mercuric chloride markedly increased the synthesis of HSP70. At 20 or 40 μM mercuric chloride in medium, HeLa cells synthesized HSP70 at 2 h after exposure, maximally at 4–7 h, and gradually diminished thereafter. Examination of the cytotoxicity of mercuric chloride by the conventional neutral red uptake assay revealed a reduction of uptake of the dye in the presence of mercuric chloride at 40 μM and above. These findings suggest that the induction of synthesis of HSP70 is one of the most sensitive cellular responses caused by mercury ion, and the heat shock protein assay can be utilized for evaluation of the cytotoxicity of dental materials.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1018519102758
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  • 6
    Digitale Medien
    Digitale Medien
    Preparation and characterization of glass composite using metal particles coated with semiconductive SnO2 fine particles obtained via sol—gel method (1997)
    Springer
    Journal of materials science 8 (1997), S. 179-188 
    Details
    ISSN: 1573-482X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Maschinenbau
    Notizen: Abstract SnO2—glass composites are promising materials for nitrogen-fireable thick film resistor systems. However, the SnO2—glass composite has many undesirable properties which should be improved for industrial application, such as a high electrical resistivity and a large negative temperature coefficient of electrical resistance. This work was undertaken to make a survey of the methods for improvement in the electrical properties of the SnO2—glass composites. The effect of the addition of Cu particles, with a large positive temperature coefficient of electrical resistance, on the electrical properties of SnO2—glass composites has been investigated. Cu particles have been coated with semiconductive SnO2 fine particles by hydrolysing tin and antimony ethoxides then firing. The coated particles have been applied as conductive components in the glass composite. Using SnO2-coated Cu particles, Cu and SnO2 particles are homogeneously dispersed in a glass matrix, and the electrical properties of the glass composites largely depend on the volume fraction of Cu in the glass composite. The volume fraction of Cu in the glass composite is determined by a Cu/SnO2 volume ratio in the coated particles. From the experimental evidence, it is thought feasible to produce the glass composite having well-controlled electrical properties by the suitable selection of the Cu/SnO2 ratio in the coated particles.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1018598214203
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  • 7
    Digitale Medien
    Digitale Medien
    Ascorbic acid prevents ischemia-reperfusion injury in the rat small intestine (1997)
    Springer
    Transplant international 10 (1997), S. 89-95 
    Details
    ISSN: 1432-2277
    Schlagwort(e): Key words Small intestine ; ascorbic acid ; reperfusion ; Ascorbic acid ; small intestine ; reperfusion ; Reperfusion ; ascorbic acid ; small intestine ; Ischemia ; ascorbic acid ; reperfusion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Ischemia-reperfusion injury by free radicals and lipid peroxides is observed in various organs. Ascorbic acid (AsA) or glutathione (GSH) in various doses (AsA:2, 0.5, 0.1 mmol/kg, GSH:2 mmol/kg) was intraperitoneally administered to male Wistar rats. The entire small intestines were resected just before ischemia, after ischemia, and after 20 min of reperfusion (n = 7–10 at each time point). At each time point, the specimens were subjected to assays of lipid peroxides, GSH, and glutaminase activity of the tissues; they were also examined histologically. In the AsA group, the production of lipid peroxides after reperfusion was significantly suppressed in a dose-dependent manner, and the ratio of oxidized GSH to total GSH was also significantly low. Tissue glutaminase activity decreased to a lesser extent, and the degree of injury was apparently less marked in the AsA group. This study indicates that AsA acts as an antioxidant against peroxidative tissue injury, possibly by scavenging radicals, preserving reduced GSH, and reducing the peroxidative reaction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001470050018
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  • 8
    Digitale Medien
    Digitale Medien
    Anthocyanin-flavone copigmentation in bluish purple flowers of Japanese garden iris (Iris ensata Thunb.) (1997)
    Springer
    Euphytica 98 (1997), S. 163-167 
    Details
    ISSN: 1573-5060
    Schlagwort(e): Iris ensata ; copigmentation ; bluing effect ; flower color breeding
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract The in vitro identification of copigmentation was carried out using anthocyanins, such as malvidin 3RGac5G, petunidin 3RGac5G and delphinidin 3RGac5G and the flavone isovitexin. These are major pigments of Iris ensata. These anthocyanins brought about copigmentation, i.e., the bathochromic shift (bluing effect) of visible λ max due to increased concentrations of isovitexin, and 32 to 35 nm were estimated as the magnitude (Δλ max) of each shift. In addition, the absorption spectrum of 0.1 mM malvidin 3RGac5G, 0.07 mM petunidin 3RGac5G and 0.7 mM isovitexin mixture closely matched those of the fresh outer perianths of the bluish purple cultivars, ‘Suiten-isshoku’, ‘Hekikai’ and ‘Yakonotama’ which belong to the malvidin 3RGac5G - petunidin 3RGac5G type of I. ensata. Therefore, these results indicated that the bluing effect on the flower color of the bluish purple cultivars of this species was caused at least in part by the copigmentation between these anthocyanins and the flavone isovitexin. For the copigment effects of isovitexin among malvidin 3RGac5G, petunidin 3RGac5G and delphinidin 3RGac5G, λ max and Δλ max of delphinidin 3RGac5G was slightly higher than those of malvidin 3RGac5G or petunidin 3RGac5G, and the copigmentation of delphinidin 3RGac5G was characterized by a higher concentration of isovitexin. Finally, the breeding for blue flowers due to copigmentation of delphinidin 3RGac5G with isovitexin in I. ensata was discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003152813333
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  • 9
    Digitale Medien
    Digitale Medien
    Effect of molecular weight on the production of multi-hollow polymer particles by the alkalîcooling method (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 82-85 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Key words Multi-hollow particle ; emulsion polymerization ; morphology ; carboxyl group ; alkali swelling
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract  The effects of molecular weight, particle diameter and cooling condition on the formation of multi-hollow structure formed within submicron-sized styrene-methacrylic acid copolymer particles by the “alkali/cooling method” proposed by the authors were examined and the formation mechanism was proposed. The original particles were produced by emulsion copolymerization in the presence of n-octyl mercaptan as a chain transfer agent.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003960050055
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  • 10
    Digitale Medien
    Digitale Medien
    Differentiation and development of Leydig cell, and induction of spermatogenesis during testicular differentiation in the Japanese eel, Anguilla japonica (1997)
    Springer
    Fish physiology and biochemistry 16 (1997), S. 187-195 
    Details
    ISSN: 1573-5168
    Schlagwort(e): gonad ; testicular differentiation ; Leydig cell ; Sertoli cell ; human chorionic gonadotropin ; spermatogenesis ; 11-ketotestosterone ; eel ; steroid producing cell
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The initial appearance and the development of Leydig cells (LCs), the sites of steroid hormone production in the testis, were investigated ultrastructurally during testicular differentiation in the Japanese eel, Anguilla japonica. In addition, the effects of a single injection of human chorionic gonadotropin (HCG; 5 IU g body weight-1) on histological changes of the testes and serum 11-ketotestosterone (11-KT) were examined at various stages (15–18, 20–23, 26–29, 32–35, 38–41 and 46–50 cm body length (BL)) of testicular differentiation. Testicular differentiation was morphologically characterized by the development of loose connective tissue on the medial side in animals 18–29 cm in BL. Ultrastructurally, LCs were first identified in the loose connective tissue of the testis of the 23 cm fish. In the testes of fish over 32 cm, clusters of LCs were distributed throughout the interstitial region accompanying the increase in number of spermatogonia. In fish larger than 32 cm, spermatogenesis was induced by administration of HCG; serum 11-KT levels were also raised. On the other hand, there was no effect on spermatogenesis or serum 11-KT levels in fish less than 29 cm, or in the controls. These result suggests that morphological differentiation of LCs occurs in testis of the 23 cm eel, and subsequently, the testes of eels of BL more than 32 cm acquire the capability to produce steroid hormones.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1007753115397
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