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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of polymers with amino end groups. 3. Reactions of anionic living polymers with α-halo-ι-aminoalkanes with a protected amino functionality (1990)
    s.l. : American Chemical Society
    Macromolecules 23 (1990), S. 939-945 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00206a006
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  • 2
    Electronic Resource
    Electronic Resource
    A novel histone variant localized in nucleoli of higher plant cells (1999)
    Springer
    Chromosoma 108 (1999), S. 190-199 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract.  Immunofluorescence staining with antisera raised against p35, a basic nuclear protein that accumulates in the pollen nuclei of Lilium longiflorum, specifically stained the nucleoli in interphase nuclei of somatic tissues, including root and leaf, and in pachytene nuclei during meiotic division, whereas antisera raised against histone H1 uniformly stained the entire chromatin domain with the exception of the nucleoli in these nuclei. Further, p35-specific antisera stained the nucleoli in root and leaf nuclei of the monocotyledonous plants Tulipa gesneriana, Allium cepa and Triticum aestivum and of the dicotyledonous plants Vicia faba and Nicotiana tabacum. Thus, these novel antisera stained the nucleoli in cells of all higher plants examined, although the staining patterns within nucleoli were somewhat different among plant species and tissues. The full-length cDNA of p35 was cloned on the basis of the partial amino acid sequence. The deduced amino acid composition and amino acid sequence of p35 indicate that this nucleolar protein is a novel variant of histone Hl. Further, p35 was strongly bound to ribosomal DNA in vitro. The results of immunoblotting of histones extracted from each tissue of the various plant species with the nucleolus-specific antibodies also suggested the conservation of similar epitope(s) in both mono- and dicotyledonous plants. From these results, it is suggested that similar variants of histone Hl are specifically distributed in the nucleoli of all plant species and help to organize the nucleolar chromatin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004120050368
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  • 3
    Electronic Resource
    Electronic Resource
    Unusual core histones specifically expressed in male gametic cells of Lilium longiflorum (2000)
    Springer
    Chromosoma 108 (2000), S. 491-500 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. We have cloned three novel histone genes using antibodies that recognize only nuclei of the male gametic (generative and sperm) cells of Lilium longiflorum. The deduced amino acid sequence of each clone shows only between 40% and 50% identity with the H2A, H2B and H3 somatic core histones of other plant species. Transcripts of these genes were first detected in bicellular pollen soon after microspore mitosis, and their mRNAs, as revealed by in situ hybridization, were observed only in the cytoplasm of the generative cells. As expression of these three genes was specific to generative cells within the bicellular pollen, we designated the clones gH2A, gH2B and gH3. Immunocytochemistry further revealed that the proteins encoded by these genes accumulated in the elongating and condensing generative nucleus during development of bicellular pollen, and were most abundant in the two sperm nuclei within an elongated pollen tube. We therefore propose that these male gamete-specific core histones contribute to chromatin condensation of male gametes or to chromatin remodeling, and result in the repression of gene expression in male gametes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004120050401
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  • 4
    Electronic Resource
    Electronic Resource
    TorsinA and heat shock proteins act as molecular chaperones: suppression of α-synuclein aggregation (2002)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 83 (2002), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: TorsinA, a protein with homology to yeast heat shock protein104, has previously been demonstrated to colocalize with α-synuclein in Lewy bodies, the pathological hallmark of Parkinson's disease. Heat shock proteins are a family of chaperones that are both constitutively expressed and induced by stressors, and that serve essential functions for protein refolding and/or degradation. Here, we demonstrate that, like torsinA, specific molecular chaperone heat shock proteins colocalize with α-synuclein in Lewy bodies. In addition, using a cellular model of α-synuclein aggregation, we demonstrate that torsinA and specific heat shock protein molecular chaperones colocalize with α-synuclein immunopositive inclusions. Further, overexpression of torsinA and specific heat shock proteins suppress α-synuclein aggregation in this cellular model, whereas mutant torsinA has no effect. These data suggest that torsinA has chaperone-like activity and that the disease-associated GAG deletion mutant has a loss-of-function phenotype. Moreover, these data support a role for chaperone proteins, including torsinA and heat shock proteins, in cellular responses to neurodegenerative inclusions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.2002.01190.x
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  • 5
    Electronic Resource
    Electronic Resource
    Control of magnetic properties in LaCrO3–LaFeO3 artificial superlattices (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 2847-2851 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of LaFeO3–LaCrO3 superlattices have been artificially controlled by adjusting the atomic order of the B site ions via changes of the stacking direction of the 〈100〉, 〈110〉 and 〈111〉 planes and adjustment of the stacking periodicity. When Fe and Cr layers are atomically stacked along the 〈111〉 direction, ferromagnetism appears. In the case of superlattices growing along the 〈100〉 and 〈110〉 directions, antiferromagnetic properties appear, and the Néel temperature changes systematically as the stacking periodicity increases. Although the total number of Fe and Cr ions are the same in the (100), (110) and (111) stacking planes, different magnetic properties can be created in artificial superlattices. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1327287
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic and electric properties of transition-metal-doped ZnO films (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 988-990 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 3d-transition-metal-doped ZnO films (n-type Zn1−xMxO (x=0.05–0.25): M=Co, Mn, Cr, Ni) are formed on sapphire substrates using a pulsed-laser deposition technique, and their magnetic and electric properties are examined. The Co-doped ZnO films showed the maximum solubility limit. Some of the Co-doped ZnO films exhibit ferromagnetic behaviors with the Curie temperature higher than room temperature. The magnetic properties of Co-doped ZnO films depend on the concentration of Co ions and carriers. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1384478
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  • 7
    Electronic Resource
    Electronic Resource
    Single-crystalline superconducting thin films of electron-doped infinite-layer compounds grown by molecular-beam epitaxy (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2767-2769 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-crystalline Sr1−xLaxCuO2 thin films of electron-doped infinite-layer compounds were grown by molecular-beam epitaxy. Crucial to our success was the use of KTaO3 substrates. The best film showed Tconset=41.5 K and Tczero=39.0 K, which is close to the highest Tconset of 43 K for the bulk value. The resistivity of the optimum-doped film exhibited metallic temperature dependence with a low resistivity of 320 μΩ cm at room temperature and 120 μΩ cm just above Tc. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1410872
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  • 8
    Electronic Resource
    Electronic Resource
    As-grown superconducting MgB2 thin films prepared by molecular beam epitaxy (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2046-2048 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting thin films of magnesium diboride (MgB2) were prepared on various substrates [SrTiO3 (001), sapphire R, sapphire C and Si (111)] by molecular beam epitaxy. The growth temperature was examined in the ambient to 650 °C. Only films formed at temperatures between 150 and 320 °C showed superconductivity. The best TConset of 36 K with a sharp transition width of ∼1 K was observed. The TC of the as-grown superconducting MgB2 thin films is close to the bulk value. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1405421
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  • 9
    Electronic Resource
    Electronic Resource
    Coexistence of ferroelectricity and ferromagnetism in BiFeO3–BaTiO3 thin films at room temperature (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 555-557 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: (Bi0.7Ba0.3) (Fe0.7Ti0.3)O3 films have been constructed on Nb-doped SrTiO3 (100) by the pulsed-laser deposition technique, and their physical properties have been examined. The films exhibit both ferroelectricity and ferromagnetism (weak ferromagnetism) with Pr=2.5 μC/cm2 and Mr=0.2 emu/g at room temperature. The film-thickness dependence of their magnetic and electric properties (size effect) is also discussed simultaneously. The dielectric constants of the films decrease with reducing film thickness below 1000 Å. The magnetic Curie temperature of the films, on the other hand, does not change at all down to 250 Å. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124420
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  • 10
    Electronic Resource
    Electronic Resource
    Male gametic nucleus-specific H2B and H3 histones, designated gH2B and gH3, in Lilium longiflorum (1995)
    Springer
    Planta 197 (1995), S. 289-295 
    Details
    ISSN: 1432-2048
    Keywords: Chromatin ; Generative nucleus ; Histone variants ; Immunofluorescence ; Lilium ; Pollen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two proteins that resemble core histones and might be specific to the male gametic (generative) nucleus within the pollen of Lilium longiflorum Thumb, (originally designated p22.5 and p18.5; K. Ueda and I. Tanaka, 1994, Planta, 192, 446–452) were characterized biochemically and immunochemically. Patterns of digestion of p22.5 and p18.5 by Staphylococcus aureus V8 protease closely resembled those of somatic histones H2B and H3, respectively. However, peptide fragments that were unique to p22.5 or p18.5 were also detected. Antibodies raised against these proteins did not cross-react with any somatic histones. These results indicate that p22.5 and p18.5 are different from somatic histones in terms of primary structure. Analysis of their amino-acid compositions revealed that p22.5 is a moderately lysine-rich protein while p18.5 is an arginine-rich protein. From these results, we conclude that p22.5 is a variant of histone H2B and p18.5 is a variant of histone H3. Immunofluorescence staining of pollen grains using the specific antibodies revealed that both p22.5 and p18.5 are only present in the generative cell nucleus and are not to be found in the vegetative cell nucleus. This study demonstrates that (i) specific histone variants are present in the male gametic nucleus of a higher plant, as they are in the sperm nucleus of animals, and (ii) distinct differences in histone composition exist between the nuclei of generative and vegetative cells in pollen. These novel histones (p22.5 and p18.5), specific to male gametic nuclei, have been designated gH2B and gH3, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202649
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