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  • 1
    Electronic Resource
    Electronic Resource
    Plasma prostaglandin E levels in Paget’s disease: Effect of indomethacin (1979)
    Springer
    Calcified tissue international 29 (1979), S. 5-6 
    Details
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02408048
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  • 2
    Electronic Resource
    Electronic Resource
    Particles and scaling for lattice fields and Ising models (1976)
    Springer
    Communications in mathematical physics 51 (1976), S. 1-13 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The conjectured inequality γ(6)≦0 leads to the existence of ϕ d 4 fields and the scaling (continuum) limit ford-dimensional Ising models. Assuming γ(6)≦0 and Lorentz covariance of this construction, we show that ford≧6 these ϕ d 4 fields are free fields unless the field strength renormalizationZ −1 diverges. Let λ be the bare charge and ε the lattice spacing. Under the same assumptions (γ(6)≦0, Lorentz covariance andd≧6) we show that if λε4−d is bounded as ε→0, thenZ −1 is bounded and the limit field is free.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01609048
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  • 3
    Electronic Resource
    Electronic Resource
    A note on reflection positivity (1979)
    Springer
    Letters in mathematical physics 3 (1979), S. 377-378 
    Details
    ISSN: 1573-0530
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We establish reflection positivity of covariance operators, using properties of Dirichlet or Neumann boundary data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397210
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  • 4
    Electronic Resource
    Electronic Resource
    Lunar crater arcs (1976)
    Springer
    Earth, moon and planets 16 (1976), S. 71-114 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract An analysis has been made of the tendency of large lunar craters to lie along circles. A catalog of the craters ⪰ 50 km in diameter was prepared first, noting position, diameter, rim sharpness and completion, nature of underlying surface, and geological age. The subset of those craters 50–400 km in diameter was then used as input to computer programs which identified each ‘family’ of four or more craters, of selected geological age, lying on a circular arc. For comparison, families were also identified for randomized crater models in which the crater spatial density was matched to that on the Moon, either overall or, separately, for mare and highland areas. The observed frequency of lunar arcuate families was statistically highly significantly greater than for the randomized models, for craters classified as either late pre-Imbrian (Nectarian), middle pre-Imbrian, or early pre-Imbrian, as well as for a number of larger age-classes. The lunar families tend to center in specific areas of the Moon: these lie in highlands rather than maria and are different for families of Nectarian craters than for pre-Nectarian. The origin of the arcuate crater groupings is not understood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648048
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  • 5
    Electronic Resource
    Electronic Resource
    Forced calcium entry and polarized growth of Funaria spores (1979)
    Springer
    Planta 144 (1979), S. 401-406 
    Details
    ISSN: 1432-2048
    Keywords: A23187 gradients ; Calcium ; Germination (moss spores) ; Electric fields-Funaria ; Ionophore gradient ; Moss spores-Polarization ; Spores (moss)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have used both steady electric fields, and gradients of the divalent ionophore, A23187, to control the point at which rhizoids emerge from spores of the common moss Funaria hygrometrica. The spores were grown in a medium containing calcium nitrate as the only major salt. Spores tend to form rhizoids towards the positive electrode, with a half maximal response to a difference of 4–8 mV across each cell. They also tend to form rhizoids towards the end of higher ionophore concentration in response to A23187 gradients. Both of these responses are the same at pH 5.5 and 8.0. Our tentative explanation is that Funaria spores tend to form rhizoids where most calcium enters. However, the point of chloronema emergence is scarcely affected by steady fields of up to 45 mV/cell. Moreover, when steady fields are applied across already developed rhizoids or chloronemata, their subsequent growth is directed towards the negative electrode in both cases, with rhizoids giving a 50% response at only 3—5 mV/cell, and chloronemata being less responsive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380114
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  • 6
    Electronic Resource
    Electronic Resource
    Cell-wall formation in Pelvetia embryos. A freeze-fracture study (1976)
    Springer
    Planta 133 (1976), S. 57-71 
    Details
    ISSN: 1432-2048
    Keywords: Cell-wall formation ; Fucoid eggs ; Pelvetia ; Fertilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The cell-wall formation in the egg of Pelvetia fastigiata (J.G. Agardh) DeToni (Fucaceae) was studied with freeze-fracture. 1. The wall is lamellated with microfibrils approximately parallel in each lamella. The average orientation of microfibrils turns about 35° in each subsequent lamella. This slow turn gives rise to bow-shaped arcs when the wall is obliquely cross fractured. 2. The organization of the fibrils in the innermost lamellae is visualized by their imprints on the plasma membrane. These imprints are the result of both turgor pressure and adhesion of fibrils to the membrane. 3. Strings of membrane particles appear on the plasma membrane shortly after fertilization. They seem to be formed by a fertilization-induced aggregation of isolated membrane particles. Later each string comes to lie under a fibril and along its imprint. Peculiar lateral rips indicate that some strings are tightly bound to a fibril and may be involved in its orientation. 4. Wall formation in Pelvetia is marked by pronounced secretory activities. Following fertilization, the fusion of cortical vesicles and other vesicles make numerous loci in the plasma membrane. In older embryos, fibril-free patches in the plasma membrane mark the position of microfibril elongation centers in the wall matrix. Prior to germination, these elongation centers and their corresponding membrane patches reach a high density at the presumptive rhizoid end.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386007
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  • 7
    Electronic Resource
    Electronic Resource
    The major growth current through lily pollen tubes enters as K+ and leaves as H+ (1976)
    Springer
    Planta 133 (1976), S. 1-7 
    Details
    ISSN: 1432-2048
    Keywords: Pollen tubes ; Growth current ; Potassium leak ; Proton pump ; Lilium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Growing lily (Lilium longiflorum Thunb.) pollen always drive a current into their tubes and out of their grains. The only external ions needed for growth (and the growth current) are K+, H+, and Ca2+. Increases in K+ immediately stimulate the current; while decreases in K+ immediately inhibit it. Comparable changes in H+ have the opposite effect; while those in Ca2+ have very little effect. We infer that most of the steady growth current is carried in by a potassium leak and out by a proton pump; but other considerations indicate that a minor, but controlling, component of the inward current consists of calcium ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385998
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  • 8
    Electronic Resource
    Electronic Resource
    The resummation of one particle lines (1979)
    Springer
    Communications in mathematical physics 67 (1979), S. 267-293 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We propose a partial resummation for a weak coupling cluster expansion. The resummation gives one particle lines with in/out field propagators. We give a Bethe-Salpeter equation in which one particle subtractions are defined using physical one particle states. By these methods, we show thatP(φ)2 quantum fields in the weak coupling region have only isolated bound state spectrum below the 2m threshold. HereP is not restricted to be even.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01238849
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  • 9
    Electronic Resource
    Electronic Resource
    Current pulses involving chloride and potassium efflux relieve excess pressure in Pelvetia embryos (1976)
    Springer
    Planta 131 (1976), S. 315-320 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Embryos of Pelvetia fastigiata De Toni respond to sudden decreases in osmotic pressure by driving characteristic current pulses through themselves. One group of pulses occurs immediately after the pressure decrease and another often follows about 1 h later. While there is a measurable response to decreases as small as 3%, a far larger response occurs above a threshold change of 8–10%. These pulses involve an efflux of Cl− and K+ ions which approximately restores the original turgor pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385433
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  • 10
    Electronic Resource
    Electronic Resource
    Studies of a plasmid coding for tetracycline resistance and hydrogen sulfide production incompatible with the prophage P1 (1979)
    Springer
    Molecular genetics and genomics 170 (1979), S. 319-325 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The plasmid pIP231, determining tetracycline resistance and hydrogen sulfide production is shown to belong to incompatibility group Y and to code for a restriction and modification system. Unlike the IneY plasmids, P7 and P15B, plasmid pIP231 shows only little genetic and physical homology with P1 prophage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00267065
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