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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 97 (1975), S. 583-591 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 97 (1975), S. 6137-6144 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 113 (1977), S. 33-37 
    ISSN: 1432-072X
    Keywords: Flavobacterium R1560 ; Carotenoids ; Zeaxanthin ; cts-Phytoene ; Carotenes ; Biosynthesis ; Nicotine ; Taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The main carotenoid of Flavobacterium strain R1560 has been identified as (3R,3′R)-zeaxanthin. Also present were small amounts of 15-cis-phytoene, phytofluene, “ζ-carotene” (7,8,7′,8′-tetrahydro-ψ, ψ-carotene plus 7,8,11,12-tetrahydro-ψ, ψ-carotene), neurosporene, lycopene, β-zeacarotene, γ-carotene, β-carotene, β-cryptoxanthin, rubixanthin, 3-hydroxy-β-zeacarotene and several apo-carotenals. Zeaxanthin production was inhibited by nicotine (10 mM), and lycopene and rubixanthin accumulated. The biosynthesis of zeaxanthin is discussed in terms of pathways and also of “half-molecule” reaction sequences. The presence of zeaxanthin may be a characteristic of a group of Flavobacterium species, and may thus be useful in the taxonomic classification of these organisms.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical programming 8 (1975), S. 43-53 
    ISSN: 1436-4646
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract A break in a {0, 1}-matrix is defined as a 0 with at least one 1 to its left and at least one 1 to its right in the same row. This paper is concerned with {0, 1}-matrices with given column sums and an upper limit for the row sums. In addition, there are limits on the distance from the first to the last 1 in a row. The problem that is considered is to find a {0, 1}-matrix satisfying the conditions such that the total number of breaks is minimum. An algorithm for solving this problem is presented. Computational results illustrate the effectiveness of the algorithm. The investigation originated in a problem of crew rostering.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    BioControl 24 (1979), S. 333-343 
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary The results of an inquiry, started in cooperation with Dr.P. V. Vail (formerly IAEA) and completed by the present authors are reported upon, dealing with the experimental and field use of insectpathogenic viruses in Europe except most eastern European countries. For the 42 examples listed details are given concerning (in the sequence of the headline in table 1): pest insect species, virus type, its origin, propagated on(host) in(country), investigations on safety and other side-effects, črop, size of area treated, virus dosage or concentration, amount of water, technique of application, instars treated, efficacy, remarks. Cooperating researchers (name of correspondent underlined), country⋗ The field experiments comprise 17 species of Lepidoptera, 1 Diptera, 1 Hymenoptera, and were carried out in 13 countries. The addresses of correspondents are listed in order to facilitate further contacts. Several tests carried out by the same researcher have been somewhat condensed into one line because of space limitation. — The examples reported refer to NPV 29 times, to GV 12 times, and to TIV once. Thus except the last example, all activities have been limited to baculoviruses. Safety tests only commenced, particularly withMamestra brassicae NPV,Neodiprion sertifer NPV, andLaspeyresia pomonella GV. The practical importance of virus use against pest insects is yet small in Europe. Only the following examples concern treated areas of more than 50 hectars: Nos. 15, 16, 36, 39, 42. The only virus preparation commecially produced is made in Finland and based on NPV ofN. sertifer.
    Notes: Zusammenfassung In tabellarischer Form werden die Resultate einer Umfrage in Europa (mit Ausnahme der meisten osteuropäischen Staaten) über Freilandversuche mit insektenpathogenen Viren dargestellt. Für 42, zum Teil mehrjährige Versuche und Versuchsserien mit 17 verschiedenen Viren werden Angaben über die verwendeten Viren, die Versuchsflächen, die Applikationstechniken und den Erfolg der Bekämpfungsmassnahmen gemacht. Anstelle von Literaturangaben ist für jedes Beispiel die Anschrift eines daran massgebend beteiligten Wissenschaftlers angegeben.
    Type of Medium: Electronic Resource
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  • 6
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    Unknown
    New York, N. Y. : Periodicals Archive Online (PAO)
    Columbia Journalism Review. 15:6 (1977:Mar./Apr.) 52 
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 22 (1975), S. 273-277 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The statistical weights of the stationary states in various ensembles of isotopically disordered harmonic chains are compared. It is proven that the ensemble defined by boundary conditions at both ends of the chain is constructed with correct statistical weights as follows: One matches at sitei the stationary states of the ensemble defined by the boundary condition at one end and frequencyω with those of the ensemble defined by the boundary condition at the other end andω. Finally one integrates overω and sums over all sitesi. This confirms and substantiates the conjecture on the exponential localization of the eigenstates in one dimension. The matching procedure yields an equation for the density of states.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 25 (1976), S. 327-337 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Renormalization group arguments are applied to an ensemble of disordered electronic systems (without electron-electron interaction). The renormalization group procedure consists of a sequence of transformations of the length and the energy scales, and of orthogonal transformations of the electronic states. Homogeneity and power laws are obtained for various one and two-particle correlations and for the low-temperature conductivity in the vicinity of the mobility edge. Two types of fixed point ensembles are proposed, a homogeneous ensemble which is roughly approximated by a cell model, and an inhomogeneous ensemble.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    BioControl 23 (1978), S. 275-280 
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary The effect of 5 herbicides widely used in agriculture (active ingredients: alachlor, chlorfenpropmethyl, desmetryne, phenmedipham, propachlor) were studied, mainly in the laboratory, by measuring the reduction of beneficial capacity of three entomophagous insects showing quite different behaviour. The egg parasiteTrichogramma cacoeciae March. reacted very strongly in laboratory tests as well as in the field under the influence of the herbicides. Contact toxicity tested on residues on glass plates caused a reduction of the degree of parasitization leading to total mortality of the population, in contaminated cages for some preparations. Part of this effect was caused by the zero formulation examined simultaneously. In the study of the contact toxicity of the spray deposit on single leaves as well as on whole plants the strong effect onTrichogramma by some of the preparations was shown. This direct toxic effect should be discerned from a repellent effect which was probably more important in the field. In addition to this direct contact effect of spray deposits also systemic application caused an effect after transportation of herbicides through the soil and the plant. This was clearly demonstrated by a reduction of the degree of parasitization in comparison to untreated controls. The herbicides studied do not seem to have any influence onChrysopa carnea Steph. larvae. No effect was visible, neither in tests of contact toxicity or contaminated sandy soil nor in choice experiments on a repellent action of the residue or after topical application of the preparations. — Also after peroral application through an artificial food chain no influence of the preparations could be demonstrated. Only the overdosage of one herbicide increased the mortality rate of the test larvae. The adults showed also no repellent reaction against the herbicides tested in choice experiments. The syrphidEpistrophe balteata DeG., however, reacted in a more sensitive manner on the influence of herbicides. Both, in contact experiments of toxicity as well as in choice experiments for a possible repellent effect an influence on the larval stages of the herbicides examined was shown. The peroral intake over an artificial food chain had no effect on the larvae after systemic application of the herbicide. If, however, the same herbicide was sprayed directly on the plant, an increase of larval nortality was observed. Adults of this syrphid showed also reactions on herbicide residues. Females during egg deposition avoided surfaces previously treated by the herbicide (phenmedipham). In tests on a possible ovicidal effect of herbicides on the eggs of all 3 entomophagous species only one herbicide (chlorfenpropmethyl) reduced the rate of egg-hatching of syrphids quite clearly. In summing up it can be said that damages as observed depend on the species as well as on the herbicide applied and the type of application. Losses of sensitive entomophagous species in the field might well be possible according to the results obtained in experiments using certain herbicides.
    Notes: Zusammenfassung An Larven und Imagines von drei Nutzinsektenarten:Trichogramma cacoeciae March. [Hym.: Trichogrammatidae], Chrysopa carnea Steph. [Planipennia: Chrysopidae] undEpistrophe balteata DeG. [Dipt.: Syrphidae] wurde im Biotest der Einfluss von fünf landwirtschaftlich wichtigen Herbiziden: Lasso, Ramrod, Semeron 25, Betanal und Bidisin forte, vorwiegend im Labor untersucht. Eine toxische Wirkung auf die Nützlinge war abhängig von dem geprüften Mittel sowie der Tierart. Während sichChrysopa als unempfindlich gegenüber den Präparaten erwies, waren beiEpistrophe toxische Wirkungen unter dem Einfluss einiger Präparate festzustellen. Auf die hochempfindlichen Trichogrammen wirkten dagegen sämtliche geprüften Herbizide mehr oder weniger schädlich. Somit sind wahrscheinlich auch im Freiland nach Applikation bestimmter Präparate Schädigungen dieser Nützlinge zu erwarten.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 237-240 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Steel embrittlement by hydrogen sulfideTensile tests in a pressurized vessel filled with hydrogen sulfide and its mixtures with air or hydrogen show, that at 18 and 130 at hydrogen sulfide produces steel embrittlement in a way comparable to hydrogen; the extent of embrittlement, however, is considerably higher in the case of hydrogen sulphide. Addition of air does not show any influence on embrittlement, while in mixtures with hydrogen embrittlement is less pronounced than under the effect of the pure components. When carrying out such experiments it is necessary to take into account that the experimental apparatus is contaminated by hydrogen sulfide for some time after the experiments, so that during subsequent experiments with pure hydrogen a side effect due to hydrogen sulfide must be expected; this means that in such cases the values obtained are below those obtained for embrittlement in pure hydrogen.
    Notes: Zugversuche in einer Druckkammer, gefüllt mit Schwefelwasserstoff bzw. dessen Gemischen mit Luft oder Wasserstoff zeigen, daß bei Drücken von 18 und 130 at Schwefel-wasserstoff Stahl in der gleichen Weise schädigt wie Wasserstoff; die Wirkung ist jedoch im Falle von Schwefelwasserstoff wesentlich stärker. In den Gemischen mit Luft läßt sich kein Einfluß dieses Zusatzes auf die Versprödung erkennen, während in den Gemischen mit Wasserstoff die Versprödung geringer ist als bei Einwirkung der reinen Komponenten. Bei derartigen Versuchen ist auch zu berücksichtigen, daß die Versuchsapparatur durch Schwefelwasserstoff längere Zeit kontaminiert wird, so daß bei anschließenden Versuchen mit Wasserstoff immer mit einer durch Schwefelwasserstoff bedingten Nebenwirkung zu rechnen ist und die Werte der reinen Wasserstoffversprödung nicht erreicht werden.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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