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  • 1990-1994  (4)
  • 66.30. − h  (1)
  • Arachnoid villi  (1)
  • Bombyx mori  (1)
  • CT  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Biological activity of enantiomerically pure forms of insect juvenile hormone I and III inBombyx mori (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 220-221 
    Details
    ISSN: 1420-9071
    Keywords: Juvenile hormone ; enantiomer ; biological activity ; Bombyx mori ; allatectomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Biological activity of enantiomerically pure juvenile hormones was assayed by topical application on allatectomizedBombyx fourth instar larvae. JHs tested were (10R)-JH I [methyl (2E,6E,10R,11S)-10,11-epoxy-3,11-dimethyl-7-ethyl-2,6-tridecadienoate], (10S)-JH I [methyl (2E, 6E, 10S, 11R)-10,11-epoxy-3,11-dimethyl-7-ethyl-2,6-tridecadienoate], (10R)-JH III [methyl (2E,6E,10R)-10,11-epoxy-3,7,11-trimethyl-2,6-dodecadienoate] and (10S)-JH III [methyl (2E,6E,10S)-10,11-epoxy-3,7,11-trimethyl-2,6-dodecadienoate]. Among these compounds, natural (10R)-JH I was most active and the dose needed to induce 50% larval molting was 0.04 μg/larva; it was approximately 12,000 times more active than unnatural (10S)-JH I. Though natural (10R)-JH III showed slight biological activity, it was only one three-thousandth of that of (10R)-JH I. Unnatural (10S)-JH III exhibited no biological activity at the levels assayed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02027321
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Immunohistochemical expression of glutathione S-transferase placental type (GST-π), a detoxifying enzyme, in normal arachnoid villi and meningiomas (1990)
    Springer
    Virchows Archiv 417 (1990), S. 493-496 
    Details
    ISSN: 1432-2307
    Keywords: Arachnoid villi ; Meningioma ; Glutathione S-transferase placental type ; Cerebrospinal fluid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Human normal dura mater containing arachnoid villi were examined for their expression of glutathione S-transferase placental type (GST-π), a detoxifying enzyme, using an immunohistochemical method. All of the arachnoid villi and arachnoid cells in five normal cases were found to have expression of GST-π, although no positive reaction for the enzyme was present in other tissues of the dura mater. The results show a possible role for arachnoid tissues in protecting human brain from hazardous xenobiotics in the cerebrospinal fluid. Twenty-six meningiomas were also examined for expression of the enzyme. Tissues of meningotheliomatous meningiomas were always positive for expression of the enzyme. Transitional meningiomas also showed the expression in their meningotheliomatous components. No staining reaction of GST-π was recognized in fibroblastic meningiomas except for two cases with a tendency to meningotheliomatous differentiation. The findings suggest a functional similarity between the arachnoid tissues and meningotheliomatous components of meningiomas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01625729
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Serial neuroradiological studies in focal cerebritis (1994)
    Springer
    Neuroradiology 36 (1994), S. 285-288 
    Details
    ISSN: 1432-1920
    Keywords: Cerebritis ; Brain abscess ; MRI ; CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report serial neuroradiological studies in a patient with focal cerebritis in the head of the left caudate nucleus. On the day after the onset of symptoms, CT showed an ill-defined low density lesion. The lack of contrast enhancement appeared to be the most important finding for differentiating focal cerebritis from an encapsulated brain abscess or a tumour. MRI two days later revealed the centre of the lesion to be of slightly low intensity on T1-weighted inversion recovery (IR) images and very low intensity on T2-weighted spin echo images, which appeared to correspond to the early cerebritis stage of experimentally induced cerebritis and brain abscess. Ten days after the onset of symptoms, CT revealed a thin ring of enhancement in the head of the caudate nucleus, and a similar small ring was seen in the hypothalamus 16 days after the onset, corresponding to the late cerebritis stage. MRI nine days later revealed ill-defined high signal lesions within the involved area on the T1-weighted IR images. To our knowledge, this is the first published MRI documentation of the early cerebritis stage developing into an encapsulated brain abscess. The mechanisms underlying of these radiographic changes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00593261
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Structure of nm-sized InSb clusters formed by spontaneous alloying (1994)
    Springer
    The European physical journal 31 (1994), S. 209-212 
    Details
    ISSN: 1434-6079
    Keywords: 61.16.Di ; 36.40. + d ; 66.30. − h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The alloying behavior of antimony atoms into nm-sized indium clusters has been studied in situ by TEM. When antimony atoms are vapor-deposited onto nm-sized indium clusters, a rapid dissolution of antimony atoms into indium clusters takes place and as a result InSb compound clusters are successfully formed. Such spontaneous alloying occurs even at ambient temperature. InSb clusters thus formed have the wurtzite structure. When these InSb clusters are annealed at 533 K, their structure changes into the sphalerite structure, which is the structure of the equilibrium phase of the bulk In50Sb50. The appearance of wurtzite-type InSb by spontaneous alloying is discussed in terms of ionicity of bonds in InSb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437838
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    Paper (German National Licenses)
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