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  • 1985-1989  (12)
  • 1975-1979  (14)
  • 1960-1964  (1)
  • 11
    Digitale Medien
    Digitale Medien
    Electron-microscope study of the crystal structures of mixed oxides in the systems Rb2O–Ta2O5, Rb2O–Nb2O5 and K2O–Ta2O5 with composition ratios near 1:3. I. Stacking characteristics of MO6 layers (1978)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 765-773 
    Details
    ISSN: 1600-5724
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: The crystal structures of phases, previously designated as 11L, 9L and 16L, which were commonly found in the title systems are suggested from their high-resolution two-dimensional electron-microscope images. Two types of blocks are found which are composed of five and six layers of pentavalent-metal oxide octahedra and are closely related to the pyrochlore structure. The 11L structure is of rhombohedral {\tt ABCABC} stacking of the former type of block, and the 9L structure is of hexagonal {\tt B}_{0}{\tt A}_{0}^{\prime}{\tt B}_{0}{\tt A}_{0}^{\prime} stacking of the latter type of block. The 16L structure is found to be an alternate stacking of the two types of blocks. The method of stacking of the blocks is the same for the three structures and is found to be favorable from the point of view of local charge balance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567739478001588
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  • 12
    Digitale Medien
    Digitale Medien
    Electron-microscope study of the crystal structures of mixed oxides in the systems Rb2O–Ta2O5, Rb20–Nb2O5 and K2O–Ta2O5 with composition ratios near 1:3. II. Various intergrowth phases and two-dimensional ordering of pentavalent ions (1978)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 773-781 
    Details
    ISSN: 1600-5724
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: In part I, the preceding paper, structural models were proposed on the basis of high-resolution electron microscopy for phases previously designated as 11L, 9L and 16L, which were found to exist in the title systems. Two types of blocks were found, which are composed of five and six layers of octahedra. In the present paper, various intergrowth phases which are composed of the two types of blocks are described. A new notation is proposed to denote these intergrowth phases as well as the 11L, 9L and 16L structures. Two-dimensional ordering of pentavalent ions in the six-layer block is found, giving rise to diffuse scattering in electron diffraction patterns. Two-dimensional images, calculated on the basis of the proposed model, are found to reproduce the observed images.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S056773947800159X
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  • 13
    Digitale Medien
    Digitale Medien
    Effect of albumin on uncoupling of oxidative phosphorylation by chinoform in rat liver mitochondria (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 1069-1070 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Addition of serum albumin diminished the uncoupling effect of chinoform on oxidative phosphorylation in rat liver mitochondria. Upon increasing the concentration of magnesium ions in the medium, the action of serum albumin was diminished. These results indicate that serum albumin combines with chinoform in competition with magnesium ions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02326965
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  • 14
    Digitale Medien
    Digitale Medien
    Distribution of type A and B monoamine oxidase activities in the central nervous system of rat and chick (1976)
    Springer
    Cellular and molecular life sciences 32 (1976), S. 13-14 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The distribution of type A and B monoamine oxidase (MAO) activities in the central nervous system (CNS) of rat and chick was investigated using 5-hydroxytryptamine and β-phenylethylamine as specific substrates. The distribution of type A MAO was similar to that of type B MAO in rat CNS, but quite different in chick CNS. This may be ascribed to the difference in animal species. The major part of MAO activity in the spinal cord was found to be type A.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01932596
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  • 15
    Digitale Medien
    Digitale Medien
    Effect ofβ-phenylethylamine on intraocular pressure (1979)
    Springer
    Cellular and molecular life sciences 35 (1979), S. 641-641 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Upon injection of β-phenylethylamine (PEA) into the subconjunctival space of rabbit, intraocular pressure increased. This effect went parallel with the amount of PEA transferred into the anterior chamber, which indicates that intraocular pressure was elevated by direct action of PEA.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01960371
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  • 16
    Digitale Medien
    Digitale Medien
    Lipid peroxidation caused by chinoform-ferric chelate in cultured neural retinal cells (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1561-1563 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Lipid peroxidation ; chinoform-ferric chelate ; chick neural retinal cells
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Incorporation of chinoform-ferric chelate was demonstrable in cultured neural retinal cells of chick embryos after 1 h of incubation, and the lipid peroxide level in the cells was increased strikingly 1 h thereafter. On the other hand, free ferric ions were scarcely incorporated into the cells, and a significant increase in the lipid peroxide level in the cells was not observed. These data indicate that chinoform is carrier of iron for its passage through cell membranes and that the incorporated iron induces lipid peroxidation which in turn leads to neural cell degeneration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01964807
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  • 17
    Digitale Medien
    Digitale Medien
    Expression of the mutant gene for L-gulono-γ-lactone oxidase in scurvy-prone rats (1989)
    Springer
    Cellular and molecular life sciences 45 (1989), S. 126-129 
    Details
    ISSN: 1420-9071
    Schlagwort(e): L-gulono-γ-lactone oxidase ; ascorbic acid deficiency ; enzyme defect ; rat ; nuclei acid hybridization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary A mutant strain of Wistar rats with L-gulono-γ-lactone oxidase deficiency has recently been established. To investigate this deficiency by DNA and RNA blot hybridization analyses, a fragment of a previously cloned cDNA encoding rat L-gulono-γ-lactone oxidase was used as a probe. When genomic DNA of the mutant rat was digested with several restriction enzymes, the probe hybridized to fragments of the same sizes as those produced from DNA of normal rats. Poly(A)+RNA from the liver of the mutant rat was found to contain an L-gulono-γ-lactone oxidase-specific mRNA of a normal size at a comparable level to that of normal rats. An in vitro translation experiment revealed that the mRNA programmed the synthesis of an enzyme protein which had the same molecular weight as that of the translational product of the normal mRNA, although the amount synthesized was markedly reduced as compared with that synthesized with the normal mRNA. In accordance with this observation, a very low but definite degree of L-gulono-γ-lactone oxidase activity was detected in the microsomes of the mutant rat by a newly developed, highly sensitive method.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01954844
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  • 18
    Digitale Medien
    Digitale Medien
    Disorders produced during high-current and high-dose phosphorus ion implantation in silicon (1979)
    Springer
    Applied physics 20 (1979), S. 225-229 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.70 ; 61.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Transmission electron microscopy, optical reflection and channeling effect measurements are employed to investigate disorders in 30 keV, high dose (3×1016ions/cm2) and high current (≦5 mA) phosphorus as-implanted silicon with (111), (100), and (110) orientation as a function of temperature rise (100–850°C) by the beam heating effect during implantation. Temperature rise below 400°C results in continuous amorrphous layer formation. This contrasts with results of the recovery into single crystals for temperature rise samples above 500°C, regardless of wafer orientation. Secondary defects (black-dotted defects, dislocation loops and rodlike defects) are formed in singlecrystal recovery samples, having a deeper distribution in (110) wafers and a shallower distribution in (111) and (100) wafers. Rodlike defects observed in 850°C samples are of “vacancy” type and have the largest density in (110) wafers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00886022
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  • 19
    Digitale Medien
    Digitale Medien
    Vasopressin secretion: suppression after light and tone stimuli previously paired with footshocks in rats (1988)
    Springer
    Experimental brain research 71 (1988), S. 291-297 
    Details
    ISSN: 1432-1106
    Schlagwort(e): ACTH ; Emotional response ; Motor activity ; Vasopressin ; Rat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In an attempt to find whether vasopressin (VP) secretion is suppressed by learned emotional stress, we have given rats under a hypertonic condition simultaneously applied light and tone that had been paired previously with footshocks and have quantified immunoreactive VP (ir-VP) in the plasma. In a training session light (60 watt) and tone (2 kz) of 3-s duration which were paired with electric footshocks (50 Hz, 1-s duration) were given to rats 11 times at an interval of 30 s. Various lengths of time after the training, the rats were tested with light and tone, which were unpaired with footshocks and repeatedly applied every 15 s for 3 min in the box used for training. Hypertonic NaCl (0.5 M, 2 ml/ 100 g b. w.) was injected s. c. 30 min before testing to increase the basal level of plasma VP. After testing, plasma ir-VP was significantly less in the experimental group than in the 0-mA control group of rats that were trained without FS. The values for the experimental group were also significantly less than those of untested control rats that had been trained with FS but were not tested. Plasma osmolality and blood haemoglobin concentration were not significantly different between control and experimental groups. Plasma immunoreactive adrenocorticotrophic hormone (ir-ACTH) level was higher and motor activity as expressed by cumulative time period of body movement during testing was lower in the experimental group than in either of the control groups. The difference in plasma ir-VP between experimental and control groups was statistically significant two days but not seven days after training, whereas ACTH and motor activity in experimental groups were still significantly different from those in control groups seven days after training. The suppressive VP and augmentative ACTH responses to testing disappeared in the rats that had received light and tone repeatedly during the intervening period between training and testing. These data support the hypothesis that emotional stimuli suppress VP secretion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00247489
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  • 20
    Digitale Medien
    Digitale Medien
    Synergistic activation of rat supraoptic neurosecretory neurons by noxious and hypovolemic stimuli (1986)
    Springer
    Experimental brain research 62 (1986), S. 572-578 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Vasopressin cell ; Noxious input ; Hypovolemia ; Supraoptic nucleus ; Rat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The effects of saphenous nerve stimulation on discharge activity of supraoptic neurosecretory (NS) cells were studied in anesthetized rats. Of 112 supraoptic neurosecretory cells, 62 exhibited a ‘phasic’ discharge pattern. The nerve stimulation transiently excited 46 of these 62 ‘phasic’ units, as well as 35 of the 50 remaining ‘non-phasic’ units. No appreciable blood pressure change was noted using PSTHs with 1-ms resolution. Though the nerve stimulation also evoked a flexor reflex of the ipsilateral hind limb, blockage of the hind limb movement with gallamine did not alter the amplitude of the supraoptic cell excitation. The threshold of the nerve stimulation was higher for the excitation than for the flexor reflex. Effects of hypovolemic and hyperosmotic stimuli on discharge activity of ‘phasic’ cells during saphenous nerve stimulation were studied to find a possible interaction between these stimuli. Hemorrhage potentiated the transient excitation evoked by the nerve stimulation in all of the 8 ‘phasic’ cells tested, while no such effect was seen after an injection of hypertonic sodium chloride solution in the 7 ‘phasic’ cells tested. These electrophysiological data suggest that hypovolemic and noxious stimuli potentiate VP secretion in a synergistic manner but that hyperosmotic and noxious stimuli do not.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00236036
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