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  • 36.40  (3)
  • Nicotiana  (2)
  • Toxicology  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Enrichment of heterokaryocytes between mesophyll and epidermis protoplasts by density gradient centrifugation after electric fusion (1987)
    Springer
    Theoretical and applied genetics 75 (1987), S. 26-29 
    Details
    ISSN: 1432-2242
    Keywords: Density gradient centrifugation ; Electric fusion ; Epidermis protoplasts ; Heterokaryocyte enrichment ; Mesophyll protoplasts ; Nicotiana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mesophyll protoplasts from Nicotiana glauca were fused with epidermal protoplasts from N. langsdorffii by an electric pulse. After the fusion products were centrifuged on stepwise density gradient centrifugation using Percoll and sea water, somatic hybrids were observed at 70%–80% in the fraction recovered from the intermediate specific gravity fraction between epidermis and mesophyll protoplasts. From offsprings of these somatic hybrids, teratomatous plants were regenerated. Since the difference of specific gravity between mesophyll and epidermis protoplasts is inherent, this procedure can be essentially applied to obtain somatic hybrids between any combination of plants. The significance of this study is discussed in relation to obtaining somatic hybrids between plant materials without any appropriate genetic markers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249137
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  • 2
    Electronic Resource
    Electronic Resource
    A case of drowning linked to ingested sulfides — a report with animal experiments (1996)
    Springer
    International journal of legal medicine 109 (1996), S. 42-44 
    Details
    ISSN: 1437-1596
    Keywords: Toxicology ; Drowning ; Sulfides ; Human tissue ; Distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Notes: Abstract An adult male was found dead beneath a pool of sewage in the pump room of a fish market. Autopsy revealed the cause of death to be suffocation after aspirating sewage into the respiratory tract. Since hydrogen sulfide gas was detected in the atmosphere at the scene of the accident, gas poisoning was suspected and toxicological analysis of sulfides in body tissues was performed. The concentrations of sulfides in the blood, lung and kidney were 0.95 μmol/ml, 0.22 and 0.38 μmol/g, respectively. These values were remarkably higher than those in previously reported cases involving exposure to hydrogen sulfide gas. Therefore, oral intake of sulfides was assumed and the distribution of sulfides in tissues following oral administration of sodium sulfide solution was examined by means of animal experiments using rats. The concentration of sulfides in the blood from rats following oral intake was much higher than that seen following gas exposure. Based on these results, we concluded that the victim had been exposed to hydrogen sulfide gas and had then collapse into a pool of sewage containing sulfides. The sulfides which were distributed throughout the body tissues had mainly issued from the alimentary tract prior to death by drowning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01369601
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  • 3
    Electronic Resource
    Electronic Resource
    Organization of heterogeneous mitochondrial DNA molecules in mitochondrial nuclei of cultured tobacco cells (1993)
    Springer
    Protoplasma 175 (1993), S. 112-120 
    Details
    ISSN: 1615-6102
    Keywords: Cell culture ; DNA content ; Mitochondrial DNA ; Mitochondrial genome ; Nicotiana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The molecular size of mitochondrial DNA (mtDNA) molecules and the number of copies of mtDNA per mitochondrion were evaluated from cultured cells of the tobacco BY-2 line derived fromNicotiana tabacum L. cv. Bright Yellow-2. To determine the DNA content per mitochondrion, protoplasts of cultured cells were stained with 4′,6-diamidino-2-phenylindole (DAPI), and the intensity of the fluorescence emitted from the mitochondrial nuclei (mt-nuclei) was measured with a video-intensified photon counting microscope system (VIM system). Each mitochondrion except for those undergoing a division contained one mt-nucleus. The most frequently measured size of the DNA in the mitochondria was between 120 and 200 kilobase pairs (kbp) throughout the course of culture of the tobacco cells. Mitochondria containing more than 200 kbp of DNA increased significantly in number 24 h after transfer of the cells into fresh medium but their number fell as the culture continued. Because division of mitochondria began soon after transfer of the cells into fresh medium and continued for 3 days, the change of the DNA content per mitochondrion during the culture must correspond to DNA synthesis of mitochondria in the course of mitochondrial division. By contrast, the analyses of products of digestion by restriction endonucleases indicated that the genome size of the mtDNA was at least 270 kbp. Electron microscopy revealed that mtDNAs were circular molecules and their length ranged from 1 to 35 μm, and 60% of them ranged from 7 to 11 μrn. These results indicate that the mitochondrial genome in tobacco cells consists of multiple species of mtDNA molecules, and mitochondria do not contain all the mtDNA species. Therefore, mitochondria are heterogeneous in mtDNA composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01385008
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  • 4
    Electronic Resource
    Electronic Resource
    Photofragmentation of cluster ions: the visible photoabsorption spectrum of Ar2N 2 + (1991)
    Springer
    The European physical journal 20 (1991), S. 153-155 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 33.80 ; 33.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The absolute cross section for photodissociation of Ar2N 2 + was measured as a function of wavelength in the 470–550 nm range. A structureless broad band was observed; the cross section has a maximum of ∼ 210 × 10−18 cm2 at ∼ 500 nm. The measurement of the photofragment time-of-flight spectrum shows that(1) N 2 + , Ar+ and Ar 2 + are produced in the photodissociation of Ar2N 2 + in the wavelength range studied, and that(2) the observed visible absorption band is ascribable to a parallel-type transition of Ar2N 2 + , which possibly retains a linear geometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543961
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  • 5
    Electronic Resource
    Electronic Resource
    A mechanism of electron attachment to small clusters (1989)
    Springer
    The European physical journal 12 (1989), S. 291-292 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 34.50.H ; 34.80.D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Van der Waals clusters of various molecules were collisionally ionized by high-Rydberg rare gas atoms and slow electrons. Negative cluster ions thus produced were detected by mass spectroscopy. The ionization mechanism were investigated by measurements of the size- and the energy-dependences of the electron attachment cross sections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426959
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  • 6
    Electronic Resource
    Electronic Resource
    Photoelectron spectroscopy of (CO2)n(H2O) m − clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 367-369 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 33.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photoelectron spectra of (CO2)nH2O− (2≤n≤8) and (CO2)n(H2O) 2 − (1≤n≤2) were measured at the photon energy of 3.49 eV. The spectra show unresolved broad features, which are approximated by Gaussians. The vertical detachment energies (VDEs) were determined as a function of the cluster size. For (CO2)nH2O−, the VDE-n plots exhibit a sharp discontinuity between n=3 and 4; the VDE value is ≈3.5 eV at n=3, while it drops down abruptly to 2.59 eV at n=4. This discontinuity in VDE is ascribed to "core switching" at n=4; a C2O 4 − dimer anion forms the core of (CO2)nH2O− for n≤3, while a monomer CO 2 − is the core for n≥4. The (CO2)2(H2O) 2 − ion has a VDE of 2.33 eV, indicating the presence of a CO 2 − monomer core in the binary clusters containing two H2O molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429197
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  • 7
    Electronic Resource
    Electronic Resource
    How to diagnose polysulphide poisoning from tissue samples (1994)
    Springer
    International journal of legal medicine 106 (1994), S. 288-290 
    Details
    ISSN: 1437-1596
    Keywords: Toxicology ; Polysulphides ; Sulphide ; Tissue samples-GC ; GC/MS ; Poisoning ; Toxikologie ; Polysulfid ; Sulfid ; Gewebe ; Gewebeproben ; GC ; GC/MS ; Vergiftung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung Wir haben Tierexperimente durchgeführt, um bei Untersuchung von Gewebsproben toxikologisch eine Polysulfid-Vergiftung zu verifizieren. Ein Bade-Agens, welches Calcium-Polysulfid enthielt, wurde Ratten oral zugeführt. Hierauf wurden Polysulfide und Sulfid, das Abbauprodukt von Polysulfiden, mit Hilfe von GC and GC/MS untersucht. Die Konzentrationen der Polysulfide (μmol/ml oder g) wurden am höchsten im Blut gefunden (0,194), gefolgt von der Leber (0,051), den Lungen (0,018) und den Nieren (0,013). Die Konzentrationen waren in den übrigen getesteten Organen unterhalb der Nachweisgrenze (0,004 μmol/g). Sulfid wurde in allen Gewebsproben gefunden. Mit 0,518 μmol/ml war die Konzentration am höchsten im Blut. Diese Konzentration war 40 mal höher als jene, welche für tödliche Vergiftungen im Falle von H2S-Vergiftung erforderlich ist. Polysulfid-Vergiftungen wurden bestätigend diagnostiziert durch den Nachweis und die Messung von Polysulfiden und in Ergänzung Sulfid in Körpergeweben, am ausgeprägtesten im Blut. Zwei praktische Fallberichte von vermuteter Vergiftung mit Polysulfiden werden kurz beschrieben.
    Notes: Summary We carried out animal experiments to toxicologically verify polysulphide poisoning by analyzing tissue samples. A bathing agent containing calcium polysulphides was administered orally to rats, and then polysulphides and sulphide, the decomposed product of polysulphides, were analyzed by GC and GC/MS. The concentrations of polysulphides (μmol/ml or g) were found to be highest in blood (0.196), followed by the liver (0.051), the lungs (0.018) and kindneys (0.013), but were below the detection limit (0.005 μmol/g) in the other tissues tested. Sulphide was detected in all the tissue samples and was found to be highest in the blood (0.518 μmol/ml), this being 40 times higher than that required for fatal poisoning in the case of hydrogen sulphide. Polysulphide poisoning was considered to be confirmatively diagnosed by detecting and measuring polysuphides and supplementarily sulphide in body tissues, most pertinently in the blood. Two practical cases of suspected poisoning by polysulphides are briefly described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01224772
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