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  • Springer  (52)
  • 2000-2004  (39)
  • 1970-1974  (11)
  • 1935-1939  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Crystal structures of four complexes produced by reaction of copper(I) cyanide with imidazoles (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 389-397 
    Details
    ISSN: 1572-8854
    Keywords: CuCN complexes ; imidazolium complexes ; bridging CN groups ; one-dimensional polymers ; two-dimensional polymers ; disorder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Four complexes of CuCN with imidazoles have been prepared by adding the ligand to a solution of CuCN in aqueous sodium thiosulfate. The imidazole ligands used were 2-methylimidazole (mim), 1,2-dimethylimidazole (dmim), 5-chloro-1-methylimidazole (clmim), and 2-phenylimidazole (phim). Complex 1, (CuCN)(mim) is monoclinic, C2/c, a = 9.565(3), b = 7.764(5), c = 8.983(8) Å, β = 96.76(3)°, Z, = 4, Complex 2, (CuCN)(dmim) is monoclinic, P21/c, a = 8.120(2), b = 11.796(4), c = 16.375(9) Å, β, = 100.87(4)°, Z = 8. Complex 3, (CuCN) (clmim) is monoclinic, C2/c, a = 24.907(4), b = 6.894(5), c = 18.259(4) Å, β = 102.79(2)°, Z = 16. Complex 4, (CuCN)(phim) is orthorhombic, Pca21, a = 9.204(4), b = 8.125(2), c = 26.304(6) Å, Z, = 8. Complexes 1, 2, and 4 have one-dimensional chains –Cu–CN–Cu– with an imidazole bonded to each Cu. Complex 3 has a two-dimensional sheet of CuCN, again with an imidazole bonded to each Cu. In 1 the imidazole group is disordered by a two-fold rotation approximately around the N···N direction in the imidazole group. In 3 one of the imidazole groups has a disorder involving exchange of the Cl and CH3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009529905538
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  • 2
    Electronic Resource
    Electronic Resource
    Spectroscopy and Continuous Wave Near-Infrared Stimulated Emission of New Yttrium Gallium Garnet {Y3}[Y, Ga](Ga3)O12:Nd3+ (YGaO3:Nd3+) (2000)
    Springer
    Optical review 7 (2000), S. 101-111 
    Details
    ISSN: 1349-9432
    Keywords: solid-state lasers ; new laser ; yttrium gallium garnet ; Nd3+ion ; disordered laser crystal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Detailed spectroscopic investigations are made for a new laser material, a Nd3+-ion doped YGaO3 garnet crystal with disordered structure, grown from the physicochemical Y2O3-Ga2O3 system with sesquioxide relation close to 1:1. Following absorption and luminescence spectral analyses, the Stark splitting of the 4F3/2 and 4Ij’ manifolds of Nd3+ activators are measured with high accuracy. Between the Stark levels of two near-infrared laser channels (4F3/2→4I11/2 and 4F3/2→4I13/2) low-threshold continuous wave stimulated emission was excited at 300 K. Some spectroscopic characteristics, such as radiative lifetime of the initial laser 4F3/2 state, intermanifold and inter-Stark luminescence branching ratios, linewidths, spontaneous transition probabilities and peak and effective cross-sections of induced transitions are also determined. These parameters are necessary for a theoretical description of the functional properties of Nd3+:YGaO3 lasers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-000-0101-2
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  • 3
    Electronic Resource
    Electronic Resource
    The origin of tourniquet shock-induced cardiovascular failure in exogenous hyperthyroidism (1971)
    Springer
    Cellular and molecular life sciences 27 (1971), S. 1312-1313 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Die Veränderung des endogenen Catecholamin-Gehaltes des Herzens hyperthyroider Ratten hebt die Schockempfindlichkeit der Tiere nicht auf.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02136708
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  • 4
    Electronic Resource
    Electronic Resource
    Liver monoamine oxidase in normal and regeneratingDiemictylus viridescens (1971)
    Springer
    Cellular and molecular life sciences 27 (1971), S. 1012-1013 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé L'oxydase monoamine se trouve sous une forme active dans le foie d'un urodèle adulte capable d'activité normale et régénératrice. Au cours des deux premières heures qui suivent l'amputation d'un membre antérieur, on peut noter une augmentation appréciable de l'activité de l'oxydase monoamine. Cette augmentation indique que la tension physiologique produite par l'amputation rend actifs dans le foie les précurseurs de l'oxydase monoamine qui peuvent, à leur tour, stimuler un métabolisme plus rapide et augmenter la quantité des catécholamines qui circulent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02138848
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  • 5
    Electronic Resource
    Electronic Resource
    Anabolic effect of parathyroid hormone on bone in the rat (1970)
    Springer
    Calcified tissue international 4 (1970), S. 72-72 
    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/BF02152357
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  • 6
    Electronic Resource
    Electronic Resource
    A multi-scale simulation of an extreme downslope windstorm over complex topography (2000)
    Springer
    Meteorology and atmospheric physics 74 (2000), S. 83-101 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary A severe localized windstorm, with near-surface winds 〉 60 ms−1, occurred in an isolated valley within the Alpine mountains (〉 1800 m) of central Norway on 31 January 1995. A multi-scale numerical simulation of the event was performed with the Naval Research Laboratory (NRL)’s Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS), configured with four nested grids telescoping down to 1-km horizontal resolution. The windstorm occurred in response to topographic blocking and deformation of a lower-tropospheric warm front and attendant jet (〉 35 ms−1 at 2 km). The key findings are: i) mountain wave resonance and amplification arising from the interaction of the surface-based front and jet with complex orography, ii) sensitivity of the wave response to differential diabatic heating (vertical) gradients above the front, and iii) trapped response within the layer of large frontal stratification in the lower troposphere and subsequent amplification consistent with the theoretically-established two-layer windstorm analogue of Durran (1986).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007030070027
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  • 7
    Electronic Resource
    Electronic Resource
    Collision Probabilities for Keplerian Orbits (2000)
    Springer
    Space debris 2 (2000), S. 161-198 
    Details
    ISSN: 1572-9664
    Keywords: impact risk analysis ; orbital debris environment ; probability of collision
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We present a new derivation of the probability of collisions between spherical satellites occupying Keplerian orbits. The equations follow from the central concept of the instantaneous collision rate, an expression that describes the occurrence of collisions by using a Dirac δ-function. The derivation proceeds by showing how this instantaneous collision rate can be averaged over orbital mean anomaly angles and, additionally, over orbital precession angles to generate expressions appropriate for intermediate and long time scales. Collision rates averaged over mean anomalies tend to be non-zero during relatively brief collision seasons, when the peak collision probability may exceed the long-term average by several orders of magnitude. Derived precession-angle averages have a functional form similar but not identical to the collision probability expression derived using the spatial density approach of Kessler (Icarus, 48: 39–48, 1981), and the two methods have been found to yield numerical results to within 1% for all cases examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022916401768
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  • 8
    Electronic Resource
    Electronic Resource
    A mannose selection system for production of fertile transgenic maize plants from protoplasts (2000)
    Springer
    Plant cell reports 19 (2000), S. 654-660 
    Details
    ISSN: 1432-203X
    Keywords: Key words Maize ; Protoplast ; Transformation ; Mannose-selection marker
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Maize (Zea mays L.) callus cultures cannot use mannose as a sole carbohydrate source, but can utilize fructose for that purpose. Phosphomannose isomerase (PMI) can convert mannose to fructose. Transgenic maize plants were obtained by selecting polyethylene glycol (PEG)-mediated transformed protoplasts on mannose (20 g/l) containing medium. Transgenic calluses and plants carrying the PMI structural gene, manA, were able to convert mannose to fructose. The PEG-mediated protoplast transformation frequency was 0.06%. Stable transformation was confirmed by PCR, PMI activity, germination tests, and by histochemical staining with 5-bromo-4-chloro-3-indolyl-β-D-glucuronide (X-Gluc). Stable integration of the transgenes into the maize genome was demonstrated in T1 and T2 plants. Results indicate that the mannose selection system can be used for maize PEG-mediated protoplast transformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002999900181
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  • 9
    Electronic Resource
    Electronic Resource
    Choosing between darkness and light: The ecological genetics of photic behaviour in the planktonic larva of Spirorbis borealis (1974)
    Springer
    Marine biology 25 (1974), S. 311-317 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The light-dark preference of individual Spirorbis borealis larvae was measured by the relative amount of time spent in the lighted half of a container. Specimens taken from a tidal pool were 20% more photonegative than those obtained outside the pool, probably because of natural selection against being washed out of the pool at high tide. The between-population behavioural difference was maintained in the laboratory, and is genetic in origin. Applying biometrical genetic analysis to larvae grouped into half-sib families, the within-population variation was used to estimate an upper limit to the heritability of 0.36. It is concluded that the differences among populations greatly exceed heritable variation within populations. A numerical selection model based on the estimated maximum heritability suggests, however, that the populations could diverge by 20% in less than a year, in response to local differences in the selection regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00404973
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  • 10
    Electronic Resource
    Electronic Resource
    Autotetraploid gene segregation (1973)
    Springer
    Theoretical and applied genetics 43 (1973), S. 139-146 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Autotetraploid gene segregation was studied in Zea mays L. using a marking system of two very closely linked genes (A 1 and Sh 2) in the repulsion phase. This system makes it possible to identify many euploid and aneuploid genotypes and enables the estimation of some parameters of autotetraploid gene segregation such as double reduction, numerical nondisjunction, and the relative transmission frequencies of monosomic, disomic, and trisomic gametes. It was found that these three types of gametes did not function at the same rates on the male and female sides. Differences in observed segregation ratios between reciprocal testcrosses were explained by this phenomenon. Estimates of the frequency of double reduction were made for loci used after eliminating the effect of numerical non-disjuction on the segregation ratios. The value of double reduction appears to be the same in the male and female tetrasomic tetraploid. Tetraploids which were disomic for chromosome 3 were not isolated although they might be expected to be common in the progeny of self-fertilized or sib-crossed trisomic tetraploids. Their absence may be explained in part by the low rate of transmission of monosomic gametes from the male parent. Autotetraploid populations which are unstable for chromosome number probably achieve an equilibrium between forces which produce aneuploidy and forces which remove aneuploids from the population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306563
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