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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Solar physics 113 (1982), S. 319-325 
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Possible solar neutron emission associated with five SMM gamma-ray events on 7 June 1980, 21 June 1980, 6 November 1980, 26 November 1982 and 25 April 1984 was found from analysis of 10-minute records of the ground-based neutron monitor at Tokyo. Of these the two events on 21 June 1980 and 25 April 1984 have been already known as neutron events. The time histories of the neutron monitor count rate are compared with those of the gamma-ray count rate and the possibility of energetic neutron emission at the flare site is discussed.
    Type of Medium: Electronic Resource
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  • 12
    ISSN: 1573-2665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 13
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les auteurs ont revu 85 patients qui ont bénéficié d'une décompression antérieure et d'une arthrodèse cervicale pour myéloradiculopathie consécutive à une ossification du ligament longitudinal postérieur et ils ont étudié les facteurs en relation avec la récupération neurologique. Il s'agissait de 72 hommes et de 13 femmes qui ont été suivis pendant 8.3 ans en moyenne. Seize patients (Groupe I) ont subi une spondylectomie subtotale d'une vertèbre avec arthrodèse, 58 (Groupe II) une spondylectomie subtotale de deux vertèbres et 11 (Groupe III) de trois vertèbres. La récupération neurologique a été évaluée selon la cotation en 17 points du Comité standard de l'Association orthopédique japonaise. Les patients du Groupe I ont obtenu un taux d'amélioration de 75%, ceux du Groupe II de 72% et ceux du Groupe III de 23%, ce qui est significativement moins bon. La sévérité de l'atteinte du canal vertébral par l'ossification n'a pas affecté directement le taux d'amélioration postopératoire. La durée de la maladie, un traumatisme cervical préalable, des symptômes neurologiques marqués ont influencé défavorablement le résultat neurologique. Le type d'intervention recommandé en cas d'ossification du ligament longitudinal postérieur est une spondylectomie portant sur deux vertèbres au plus, chez des patients n'ayant pas de symptômes importants. Lorsque plus de trois vertèbres sont impliquées, une autre opération telle qu'une laminoplastie peut être envisagée.
    Notes: Summary The authors reviewed 85 patients who had undergone anterior decompression and cervical fusion for myeloradiculopathy due to ossification of the posterior longitudinal ligament. There were 72 males and 13 females; the average follow up was for 8.3 years. Sixteen patients (group I) underwent one vertebra subtotal spondylectomy with fusion, 58 (group II) two vertebra subtotal spondylectomy, and 11 (group III) three vertebra subtotal spondylectomy. Neurological recovery was assessed on the grading system of the Japanese Orthopaedic Association. The patients in group I had an average improvement of 75%, in group II 72% and in group III 23%. The severity of compromise of the spinal cord did not affect the post-operative improvement. Duration of disease, previous injury and advanced neurological symptoms all affected neurological recovery. Spondylectomy of at most two vertebrae, with fusion, is recommended for ossification of the posterior longitudinal ligament. If there is more extensive involvement laminoplasty may be indicated.
    Type of Medium: Electronic Resource
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  • 14
    ISSN: 1615-6102
    Keywords: Adiantum capillus-veneris ; Colchicine ; Cytochalasin B ; Plasma membrane — cell wall junction ; Microtubule ; Plasmolysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The junction between the plasma membrane and the cell wall in the subapical region of tip-growing protonemata of the fernAdiantum capillus-veneris was visualized by plasmolyzing the cells with a 1 M solution of NaCl. When the protonemata were treated with this solution, cells were rapidly plasmolyzed and the plasma membrane became detached from the cell wall around the entire periphery of the cell, with the exception of the subapex. In the subapical region, the connection between the cell wall and the plasma membrane remained undisturbed, whereas the membrane in other regions, as well as at the apex, was detached from the cell wall. As a result, the protoplasm appeared to adhere to the wall by a ringlike band of plasma membrane at the subapex. The location of the junction coincided with that of a circular array of microtubules (MTs) and microfilaments (MFs) at the cell cortex. The “subapical junction” disappeared when protonemata were treated with colchicine, cytochalasin B (CB), and blue-light irradiation, all of which are known to disrupt circular arrays of MTs. CB and blue light also disrupt the array of MFs but colchicine does not. Thus, the junction depends on the cortical MTs and not on the MFs. This finding indicates that the junction between the plasma membrane and the cell wall is sustained by a cortical array of MTs and suggests the presence of a specific and localized transmembrane structure.
    Type of Medium: Electronic Resource
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  • 15
    ISSN: 1615-6102
    Keywords: Blue-light response ; Chloroplast photoorientation ; Fern protonema ; Microfilament ; Phytochrome ; Rhodamine-phalloidin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Changes in the organization of cortical actin microfilaments during phytochrome-mediated and blue light-induced photoorientation of chloroplasts were investigated by rhodamine-phalloidin staining in protonemal cells of the fernAdiantum capillusveneris. Low- and high-fluence rate responses were induced by partial irradiation of individual cells with a microbeam of 20 μm in width. In the low-fluence rate responses to red and blue light, a circular structure composed of microfilaments was induced on the chloroplast concentrated in the irradiated region, on the side facing the plasma membrane, as already reported in the case of the low-fluence rate response induced by polarized red or blue light. Such a structure was not observed on the chloroplasts located far from the microbeam. Time-course studies revealed that the structure was induced after the chloroplasts gathered in the illuminated region and that the structure disappeared before chloroplasts moved out of this region when the microbeam was turned off. In the high-fluence rate response to blue light, chloroplasts avoided the irradiated site but accumulated in the shaded area adjacent the edges of microbeam. The circular structure made of microfilaments was also observed on the chloroplasts gathered in the area and it showed the same behavior with respect to its appearance and disappearance during a light/dark regime as in the case of the low-fluence rate response. However, no such circular structure was observed in the high-fluence rate response to red light, in which case the chloroplasts also avoided the illuminated region but no accumulation in the adjacent areas was induced. These results indicate that the circular structure composed of microfilaments may play a role in the anchorage of the chloroplast during intracellular photo-orientation.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 177 (1993), S. 82-85 
    ISSN: 1615-6102
    Keywords: Adiantum capillus-veneris ; Fern ; Light effect ; Nuclear positioning ; Prothallus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In the prothallus of the fernAdiantum capillus-veneris, which consists of a single cell-layer, nuclear position differs depending on light and dark conditions. Under white light, nuclei are located along the cell wall facing the light source (light-position). In contrast, in the dark, nuclei are located at the walls partitioning the cells (dark position). The change from light- to dark-position takes about 36 h, but the change from dark- to light-position takes less than 8 h.
    Type of Medium: Electronic Resource
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  • 17
    ISSN: 1615-6102
    Keywords: Adiantum capillus-veneris ; Blue light response ; Microfilament ; Microtubule ; Phytochrome ; Protonema
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Circular arrays of cortical microtubules (MTs) and microfilaments (MFs) are found in the subapical region of tip-growing protonemal cells of the fernAdiantum capillus-veneris. Reorganization of the two cytoskeletal structures during phytochrome-mediated phototropism and blue light-induced apical swelling was investigated by double-staining of MTs and MFs with rhodaminephalloidin and an indirect immunofluorescence method with tubulinspecific antibody. Before any growth responses were detectable, the MF and MT structures were reorganized according to similar patterns in both photoresponses, that is, oblique orientation and transient disappearance of the structures occurred during the phototropic response, and the disappearance of the structures occurred during apical swelling. The reorganization of MF structures clearly preceded that of the MT structures in the phototropic response. In the case of apical swelling, both types of circular array disappeared with an almost identical time course. These results provide evidence for the significant role of the circular organization of MFs as well as of MTs, in the light-induced growth responses of tip-growing fern protonemal cells. Possible roles of the circular array of MFs in the regulation of tip growth are discussed.
    Type of Medium: Electronic Resource
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  • 18
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ground state hyperfine splitting of87Sr+ was measured with a precision of 1×10−8. The experiments were performed with an RF ion trap connected to an ISOL (isotope separator on-line), where all the possible transitions between Zeeman sublevels were observed by a laser-microwave double resonance method. The magnetic dipole hyperfine constant was determined to beA=−1 000 473.673 (11) kHz.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 24 (1984), S. 143-149 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Hybrid mesons composed of a quark, an antiquark, and a gluon are studied in the case of heavy quarks. Their masses are calculated with the potential model which can interpret heavy quarkonium spectroscopy. The ground state of the hybrid mesons $$c\bar cg$$ and $$b\bar bg$$ is found to be almost spherically symmetric, whereas that of $$t\bar tg$$ is two-centered as anH 2 + molecule. The $$b\bar bg\left[ {t\bar tg} \right]$$ ground state turns out to have a mass below the $$B\bar B\left[ {T\bar T} \right]$$ threshold. The excited states contain 0−−, 1−+ exotic states and 1−− states which may be examined bye + e − colliders.
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 74 (1992), S. 315-315 
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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