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  • 1
    Electronic Resource
    Electronic Resource
    Hereditary persistence of foetal haemoglobin (1975)
    [s.l.] : Nature Publishing Group
    Nature 257 (1975), S. 70-71 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ALTHOUGH the interpretation of Martinez and Colombo1 may be correct, their conclusions are based on uncertain evidence and an alternative explanation that fits within the classical scheme is equally plausible. Their argument rests entirely on the statement that "foetal haemoglobin (HbF) levels show ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/257070c0
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  • 2
    Electronic Resource
    Electronic Resource
    Lattice theory of diffusion reactions (1975)
    Springer
    The European physical journal 22 (1975), S. 181-187 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The problem of diffusion-limited reactions is treated in lattice theory. We calculate the probability that a mobile interstitial by jump diffusion reaches a site of the recombination region around a vacancy (assumed to be given) if it starts at a distanceR p from the vacancy. We show that the continuum treatment with the recombination region represented by a spherical volume with an effective recombination radiusR a is a good approximation even for small regions and short diffusion paths. We give an explicit expression forR a in terms of the Green's function for stationary diffusion. The results for cubic lattices are discussed for recombination regions containing 1 to about 100 sites. As a rule of thumb we find that the effective recombination radiusR a is equal to the average distance $$\bar R$$ of the surface sites from the recombination center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01322363
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  • 3
    Electronic Resource
    Electronic Resource
    Diffusion reactions in long range potentials (1975)
    Springer
    The European physical journal 22 (1975), S. 343-350 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of long range potentials on the stationary rate of diffusion controlled reactions is studied. It is shown that the concept of a reaction radiusR a can be retained but due to the potentialR a becomes temperature dependent, e.g. for attractive potentials decreases with increasing temperature. We give a perscription how to calculateR a . For spherically symmetric potentials the problem can be solved exactly whereas for anisotropic potentials approximate results are obtained with the help of a variational principle. For strong potentials of the formϕ(r)=−α f(Ω)/r n the powern alone determines the temperature dependence ofR a whereas the angular functionf(Ω) determines the absolute value. Purely attractive power potentials (f(Ω)=1) yield approximatelyR a ≅(α/kT)1/n .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312804
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  • 4
    Electronic Resource
    Electronic Resource
    DDT and PCB levels in lake Coeur d'Alene, idaho, osprey eggs (1975)
    Springer
    Bulletin of environmental contamination and toxicology 13 (1975), S. 401-405 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01721842
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Struktur des Raumes der Hypernormbälle über einem linearen Raum (1975)
    Springer
    Computing 15 (1975), S. 67-70 
    Details
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Abstract This paper is concerned with the structure ofH(L, h), the space of hypernormballs on the linear spaceL. Relations betweenH(L, h) and interval spaces in the sense of O. Mayer [7] are given. IfP is an Archimedian ordered linear space possessing an order unit, the hypernormh∶ L→P + is a factorization of a norm onL. Furthermore it is shown that the real quasilinear spaces which can be regarded as subspaces of interval spaces are characterized by the absence of additive inverse elements to symmetric elements.
    Notes: Zusammenfassung In dieser Arbeit wird die Struktur des RaumesH(L, h) der Hypernormbälle über dem linearen RaumL untersucht und für reelle RäumeL ein Zusammenhang mit den Intervallräumen im Sinne von O. Mayer [7] hergestellt. Besitzt der archimedisch geordnete lineare RaumP eine Ordnungseinheit, so kann jede Hypernormh∶ L→P + angesehen werden als Faktorisierung einer Norm auf L. Ferner wird gezeigt, daß die reellen quasilinearen Räume, die als Teilräume von Intervallräumen auffaßbar sind, allein durch das Fehlen additiv inverser Elemente zu symmetrischen Elementen gekennzeichnet sind.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02252837
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  • 6
    Electronic Resource
    Electronic Resource
    Zearalenol and 8'-hydroxyzearalenone from Fusarium roseum (1975)
    Springer
    Mycopathologia 57 (1975), S. 77-78 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Fusarium roseum f. sp.gibbosum andF. roseum f. sp.semitectum were isolated from blighted culms of grain sorghum. Zearalenol and 8′-hydroxyzearalenone were produced by these isolates cultured on grain sorghum or cracked yellow field corn. Zearalenol is reported to have uterotropic activity and might be an important mycotoxin in sorghum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01365707
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  • 7
    Electronic Resource
    Electronic Resource
    Single mode operation of cw dye lasers (1975)
    Springer
    Applied physics 7 (1975), S. 21-28 
    Details
    ISSN: 1432-0630
    Keywords: Dye laser ; Single mode operation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This paper describes an investigation of the special problems of single mode operation in cw dye lasers. Single mode operation in homogeneously broadened lasers can be obtained, if the gain due to spatial hole burning is compensated by dispersive elements, as prisms, Fabry-Pérot etalons and single dielectric interfaces within the resonator. The gain and the influence of the dispersive elements were calculated for two commonly used types of resonators. The calculations make it possible to design simple continuously tunable single-mode systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900515
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  • 8
    Electronic Resource
    Electronic Resource
    Upper and lower bounds for solutions of generalized two-point boundary value problems (1975)
    Springer
    Numerische Mathematik 23 (1975), S. 433-457 
    Details
    ISSN: 0945-3245
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This paper is concerned with two-point boundary value problems for systems of differential equations and integro-differential equations. If ϕ, ψ and Φ, Ψ are functions which satisfy certain differential (integro-differential) inequalities, then the given problem has a solutionu * such that ϕ≦u *≦ψ and Φ≦u *′≦Ψ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437041
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  • 9
    Electronic Resource
    Electronic Resource
    Sister chromatid exchanges and chromatid interchanges in Bloom's syndrome (1975)
    Springer
    Human genetics 〈Berlin〉 30 (1975), S. 317-323 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A comparison is made between the incidences of sister chromatid exchanges (SCE) per chromosome and group of chromosomes and breakage, visible at metaphase like open gaps, breaks, and breaks involved in chromatid interchange formation (CI) in Bloom's syndrome. It can be shown that the two levels of breakage SCE and CI are not correlated as to the locations. The discussion deals with possible interpretations of preferential breakage and reunion at certain homologous chromosomes and the difficulties today to understand SCEs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275144
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  • 10
    Electronic Resource
    Electronic Resource
    Poly(A)-containing RNA from Petroselinum hortense: Isolation, properties and messenger function in vitro (1975)
    Springer
    Molecular biology reports 2 (1975), S. 119-127 
    Details
    ISSN: 1573-4978
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cell suspension cultures from parsley (Petroselinum hortense Hoffm.) were labelled in vivo with [2-3H] adenosine. The RNA isolated from the ribosomal pellet was fractionated on an oligo(dT)-cellulose column. Approximately 1.5% of the RNA, representing about 15% of the total radioactivity, was retained at high salt concentrations and eluted at low ionic strength. As determined by two independent methods, this fraction contained poly(A) segments with an average length of about 80 nucleotides. It was active as template in a cell-free system from wheat germ, directing the synthesis of peptides ranging in molecular weight from about 4000–40000 daltons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00357542
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