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  • Springer  (166)
  • 2005-2009  (79)
  • 2000-2004  (87)
  • 1945-1949
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  • 1
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    Biochemical and molecular biological analyses of space-flown nematodes in Japan, the first international caenorhabditis elegans experiment (ICE-First) (2007)
    Springer
    Details
    Publication Date: 2007-09-01
    Print ISSN: 0938-0108
    Electronic ISSN: 1875-0494
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Natural Sciences in General , Technology
    Published by Springer
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  • 2
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    Impact process of boulders on the surface of asteroid 25143 Itokawa—fragments from collisional disruption (2008)
    Springer
    Details
    Publication Date: 2008-01-01
    Description: The subkilometer-size asteroid 25143 Itokawa is considered to have a gravitationally bounded rubble-pile structure. Boulders appearing in high-resolution images retrieved by the Hayabusa mission revealed the genuine outcome of the collisional event involving the asteroid’s parent body. Here we report that the boulders’ shapes and structures are strikingly similar to laboratory rock impact fragments despite differences of orders of magnitude in scale and complexities of the physical processes. These similarities suggest the universal character of the process throughout the range of these scales, and the brittle and structurally continuous nature regarding the parent body of the boulders. The similarity was likely preserved because of relatively lesser comminuting processes acting on individual boulders; the close assemblages of similar appearing boulders (a boulder family) represent the impact destruction of boulders on the surface.
    Print ISSN: 1343-8832
    Electronic ISSN: 1880-5981
    Topics: Geosciences , Physics
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  • 3
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    Size-frequency statistics of boulders on global surface of asteroid 25143 Itokawa (2008)
    Springer
    Details
    Publication Date: 2008-01-01
    Description: The surface of asteroid 25143 Itokawa is covered with numerous boulders although gravity is very small compared with that of other asteroids previously observed from spacecraft. Here we report the size-frequency statistics of boulders on the entire surface of Itokawa based on high-resolution images (1 pixel ≈0.4 m) obtained by the Hayabusa spacecraft. There are 373 boulders larger than 5 m in mean horizontal dimension on the entire surface—0.393 km2—and the number density is nearly 103/km2. The cumulative boulder size distribution on the entire surface has a power-index of −3.1 ± 0.1. For the east and west sides and the head and body portions of Itokawa, the power-index of the size distributions and the number densities of boulders of these areas are thought to be similar from the statistical point of view. A global mapping of boulders shows that there is no apparent correlation in the locations of boulders and craters. The ratio of the total volume of the boulders to the total excavated volume of the craters on Itokawa is ≈25% when only craters larger than 50 m in mean diameter are considered, and this ratio is extremely larger than that on Eros and the Moon, respectively. The origin of boulders on the surface of Itokawa was examined quantitatively by calculating the number of boulders and the size of the largest boulder using a model based on impact cratering experiments. The result indicated that the boulders on the surface of Itokawa cannot solely be the product of craters. Our results suggest that the boulders originated from the disruption of the larger parent body of Itokawa, as has been described in previous papers (Fujiwata et al., Science, 312, 1330–1334, 2006; Saito et al., Science, 312, 1341–1344, 2006).
    Print ISSN: 1343-8832
    Electronic ISSN: 1880-5981
    Topics: Geosciences , Physics
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  • 4
    Electronic Resource
    Electronic Resource
    Geographical variation in female sex pheromones of the rice leaffolder moth, Cnaphalocrocis medinalis: identification of pheromone components in Japan (2000)
    Springer
    Entomologia experimentalis et applicata 96 (2000), S. 103-109 
    Details
    ISSN: 1570-7458
    Keywords: Cnaphalocrocis medinalis ; rice leaffolder ; Lepidoptera ; Pyralidae ; sex pheromone ; geographical variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sex pheromone components of the Japanese rice leaffolder moth, Cnaphalocrocis medinalis Guenée (Lepidoptera: Pyralidae) were identified from ovipositor extracts of virgin females as (Z)-11-octadecenal, (Z)-13-octadecenal, (Z)-11-octadecen-1-ol and (Z)-13-octadecen-1-ol at a ratio of 11:100:24:36 by GC-EAD, GC, GC-MS. The total amount was estimated to be ca.0.9 ng/female. Field bioassays in Kagoshima, Japan, showed that the two aldehydes are essential for male attraction and the alcohols may have a synergistic effect on the aldehydes. A rubber septum containing 0.9 mg of the four components at the natural ratio was shown to be an effective lure for monitoring this pest in Japan. The above four components are quite different from the sex pheromone components reported previously for the same species of either Philippine or Indian origin; components were shown to be (Z)-11-hexadecenyl acetate and (Z)-13-octadecenyl acetate at a ratio of 98:2 in the Philippine blend and 1:10 in the Indian blend. Furthermore, in the field tests in Japan, neither the Philippine blend nor the Indian blend showed any attractive activity, while the Japanese blend attracted significant numbers of male moths. These results suggest that there are remarkable geographical variations in the sex pheromone composition of this species or there are several distinct species using different sex pheromone blends.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004019917270
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  • 5
    Electronic Resource
    Electronic Resource
    Differentiation of Wing Epidermal Scale Cells in a Butterfly Under the Lateral Inhibition Model - Appearance of Large Cells in a Polygonal Pattern (2000)
    Springer
    Acta biotheoretica 48 (2000), S. 121-136 
    Details
    ISSN: 1572-8358
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cellular pattern formations of some epithelia are believed to be governed by the direct lateral inhibition rule of cell differentiation. That is, initially equivalent cells are all competent to differentiate, but once a cell has differentiated, the cell inhibits its immediate neighbors from following this pathway. Such a differentiation repeats until all non-inhibited cells have differentiated. The cellular polygonal patterns can be characterized by the numbers of undifferentiated cells and differentiated ones. When the differentiated cells become large in size, the polygonal pattern is deformed since more cells are needed to enclose the large cell. An actual example of such a cellular pattern was examined. The pupal wing epidermis of a butterfly Pieris rapae shows a transition of the equivalent-size cell pattern to the pattern involving large cells. The process of the transition was analyzed by using the method of weighted Voronoi tessellation that is useful for treatment of irregularly sized polygons. The analysis supported that the pattern transition of the early stage of the pupal wing epidermis is governed by the lateral inhibition rule. The differentiation takes place in order of largeness, but not smallness, of the apical polygonal area in the differentiating region of the pupal wing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002796601050
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  • 6
    Electronic Resource
    Electronic Resource
    Nonparametric Density Estimation for a Long-Range Dependent Linear Process (2000)
    Springer
    Annals of the Institute of Statistical Mathematics 52 (2000), S. 599-611 
    Details
    ISSN: 1572-9052
    Keywords: Kernel density estimator ; long-range dependence ; linear process ; bandwidth ; asymptotic normality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We estimate the marginal density function of a long-range dependent linear process by the kernel estimator. We assume the innovations are i.i.d. Then it is known that the term of the sample mean is dominant in the MISE of the kernel density estimator when the dependence is beyond some level which depends on the bandwidth and that the MISE has asymptotically the same form as for i.i.d. observations when the dependence is below the level. We call the latter the case where the dependence is not very strong and focus on it in this paper. We show that the asymptotic distribution of the kernel density estimator is the same as for i.i.d. observations and the effect of long-range dependence does not appear. In addition we describe some results for weakly dependent linear processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017504723799
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  • 7
    Electronic Resource
    Electronic Resource
    Nonparametric Estimation of a Conditional Quantile for α-Mixing Processes (2000)
    Springer
    Annals of the Institute of Statistical Mathematics 52 (2000), S. 459-470 
    Details
    ISSN: 1572-9052
    Keywords: Conditional quantile ; local polynomial fitting ; α-mixing process ; exponential inequality ; Bahadur representation ; uniform convergence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Let (X′i,Y i)′ be a set of observations form a stationary α-mixing process and Θ(x) be the conditional α-th quantile of Y given X = x. Several authors considered nonparametric estimation of Θ(x) in the i.i.d. setting. Assuming the smoothness of ΘFF(x), we estimate it by local polynomial fitting and prove the asymptotic normality and the uniform convergence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004113201457
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  • 8
    Electronic Resource
    Electronic Resource
    Evolution of magnetism in U(Ni 1- xPd x) Si single crystals (2002)
    Springer
    The European physical journal 30 (2002), S. 313-318 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.50 Ee Antiferromagnetic materials – 75.50 Gg Ferrimagnetics – 75.30 Gw Magnetic anisotropy – 75.30 Kz Magnetic phase transitions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Single crystals of U(Ni1-xPdx)2Si2 with x = 0.05, 0.09 and 0.135 have been grown. Magnetization and electrical resistivity measurements were performed in a wide range of temperatures and magnetic fields in order to study stability of magnetic phases in the solid solutions between UNi2Si2 and UPd2Si2 with a special emphasis on the type of ground state. In UPd2Si2 the simple AFI-type antiferromagnetic structure of U moments is observed at low temperatures. UNi2Si2 adopts the uncompensated AF structure (UAF) with the + + - stacking of U moments along the c-axis and consequently this compound exhibits a spontaneous magnetization corresponding to 1/3 of the U moment. The substitution of Pd for Ni leads to a rapid decay of the spontaneous magnetization. The evolution of magnetization and electrical resistivity behavior with Pd doping is tentatively attributed to the coexistence of the AF-I and UAF phases in the ground state of U(Ni0.91Pd0.09)2Si2 and U(Ni0.865Pd0.135)2Si2. In this scenario, the volume fraction of the AF-I phase rapidly grows with Pd doping on account of the UAF. At lowest temperatures an irreversible transition to the UAF phase is observed when a sufficiently high magnetic field is applied along the c-axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00384-5
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  • 9
    Electronic Resource
    Electronic Resource
    On Some Twistor Spaces Over 4ℂℙ2 (2000)
    Springer
    Compositio mathematica 122 (2000), S. 323-336 
    Details
    ISSN: 1570-5846
    Keywords: twistor space ; self-dual metric ; algebraic dimension ; elliptic curve
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We show that for any positive integer τ there exist on 4ℂℙ2, the connected sum of four complex projective planes, twistor spaces whose algebraic dimensions are two. Here, τ appears as the order of the normal bundle of C in S, where S is a real smooth half-anti-canonical divisor on the twistor space and C is a real smooth anti-canonical divisor on S. This completely answers the problem posed by Campana and Kreussler. Our proof is based on the method developed by Honda, which can be regarded as a generalization of the theory of Donaldson and Friedman.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002077103075
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  • 10
    Electronic Resource
    Electronic Resource
    Identification of a telomeric boundary of the HLA region with potential for predisposition to human narcolepsy (2000)
    Springer
    Immunogenetics 52 (2000), S. 12-18 
    Details
    ISSN: 1432-1211
    Keywords: Human narcolepsy Chromosome recombination Recombination breakpoint Susceptibility region
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. We report on a study performed to determine a boundary of the region with the potential to contribute to the predisposition to human narcolepsy (the susceptibility region) in the human leukocyte antigen (HLA) region. We investigated a Japanese narcolepsy family, in which a de novo chromosomal recombination occurred between the HLA-DRB1 and HLA-B genes in the proband. The recombinant chromosome carrying HLA-DRB1*1501 was transmitted to the affected child and grandchild, suggesting that a strong genetic factor(s) predisposing to the disorder was (were) present on the chromosome, and that the recombination breakpoint could be regarded as a boundary to the susceptibility region. To search for the breakpoint, we carried out allele typing at various polymorphic sites, e.g., microsatellite repeat polymorphisms, restriction fragment length polymorphisms, and single-nucleotide polymorphisms in the HLA region, and examined haplotypes with the polymorphic sites in the family members. Haplotype analyses revealed that the recombination breakpoint was present ~50 kb to the telomeric side of the palmitoyl-protein thioesterase-2 (PPT2) gene in the HLA class III region. From the gene map of the HLA region, the cyclic AMP response element-binding protein-related protein gene (CREB-RP) appeared to be located at the telomeric end in the 50-kb region. Therefore, the data presented here suggest that the susceptibility region for the disorder in the family is present on the centromeric side of the CREB-RP gene in the recombinant Chromosome 6 carrying HLA-DRB1*1501.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002510000245
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