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  • 1
    Electronic Resource
    Electronic Resource
    Verzeichnis der Sammlung von Algenkulturen am Pflanzenphysiologischen Institut der Universität Göttingen (1964)
    Springer
    Archives of microbiology 47 (1964), S. 402-432 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406362
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  • 2
    Electronic Resource
    Electronic Resource
    EINIGE BEOBACHTUNGEN ZUR VERÄNDERUNG DER VERUNKRAUTUNG WÄHREND MEHRJÄHRIGEN GETREIDEBAUS UND VERSCHIEDENARTIGER UNKRAUTBEKÄMPFUNG (1964)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 4 (1964), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Zusammenfassung. Auf einem stark verunkrauteten Feld (guter Lehmboden] wurde die Veränderung der Unkrautflora im Verlauf von 3 Jahren bei verschiedenartiger Unkrautbekämpfung (keine Unkrautbekämpfung; zweimal Blindeggen sowie Eggen im 3-Blattstadium des Getreides; chemische Unkrautbekämpfung mit DNOC) beobachtet In diesem Zeitraum ging die Gesamtverunkrautung als Folge des guten Getreidestandes auch in den Parzellen ohne Unkrautbekämpfung erheblich zurück.Durch jährlich wiederholte, intensive mechanische Unkrautbekämpfung wurde im Verlauf von 3 Vegetationsperioden die Gesamtverunkrautung gegenüber der Kontrolle etwas, der Bestand einzelner Unkrautarten wie Alopecunus myosuroides, Sinapis arvensis und Galeopsis tetrahit erheblich vermindert. Der prozentuale Anteil der grasartigen Unkräuter an der Gesamtverunkrautung entsprach bei Versuchsende dem der unbearbeiteten Parzellen.Durch chemische Bekämpfung mit DNOC wurden im Vergleich zur unbehandelten Kontrolle Sinapis arvensis, Palygonum convolvulus, Galium aparine und die Gesamtverunkrautung stark reduziert, Alopecurus myosuroides dagegen stark gefördert. Das Artenverhältnis änderte sich zugunsten der grasartigen Unkräuter.Some observations on changes in weed populations under continuous cereal cropping and with différent methods of weed control
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1964.tb00308.x
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic susceptibility of a one-dimensional Fermi system and dielectric function of a two-dimensional Coulomb gas (1977)
    Springer
    The European physical journal 28 (1977), S. 117-127 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A relation between the magnetic susceptibilityχ(k, ω) of an interacting 1-D Fermi system and the dielectric functionε(q) of a 2-D Coulomb gas is established. By applying a cluster-expansion technique and by using known results for the pair-correlation function of the Coulomb gas we obtain a number of expressions forε(q) which apply in different regions of theq-plane and in different temperature intervals. These results supplement the existing picture of the transition from non-metallic to metallic behaviour occurring in the 2-D Coulomb gas as the temperature increases. The relation betweenε(q) andχ(k, ω) is then used to derive explicit expressions forχ(k, ω) from these results forε(q). The change in the dielectric response of the 2-D Coulomb gas is reflected by a change in the magnetic response of the 1-D Fermi system: as a function of the spin non-flip coupling constantγ ∥ the susceptibility of the Fermi system changes from normal paramagnetic behaviour to non-magnetic behaviour characteristic of a bound singlet-spin ground state, asγ ∥ decreases. Our result for the gap in the spin excitation spectrum of the Fermi system is in agreement with the results of other authors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01325450
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  • 4
    Electronic Resource
    Electronic Resource
    Results from DASP one + e − annihilation between 3.1 and 5.2 GeV (1979)
    Springer
    The European physical journal 1 (1979), S. 233-256 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper summarizes the measurements one + e − annihilation performed by the DASP Collaboration in the energy range between 3.1 and 5.2 GeV. The following topics are covered: total cross section, production and two body decays of the narrow resonances, radiative decays of theJ/ψ and ψ′ resonances and evidence for theX(2.82), ψ′ cascade decays, inclusive η production and evidence for theF meson, semileptonic decays of charmed mesons and properties of the heavy lepton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01440224
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  • 5
    Electronic Resource
    Electronic Resource
    77Se and125Te nuclear magnetic resonance investigations in II–VI and IV–VI compounds (1978)
    Springer
    The European physical journal 289 (1978), S. 17-20 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The NMR signals of77Se or125Te have been measured in II–VI and IV–VI-compounds ZnSe, CdSe, HgSe, PbSe and ZnTe, CdTe, HgTe, PbTe relative to aqueous solutions of Na2SeO3 or K2TeO3. The chemical shifts of about −600 ppm for77Se and of about −2700 ppm for125Te have been compared with theoretical calculations. For77Se in hexagonal CdSe an anisotropic chemical shift has been observed and for125Te in CdTe and PbTe linesplittings have been found. The linewidths of the77Se and125Te NMR signals increase with the atomic number of the counterions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408490
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  • 6
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1961)
    Springer
    Colloid & polymer science 177 (1961), S. 162-165 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01521203
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  • 7
    Electronic Resource
    Electronic Resource
    Thermodynamics of the Second Dissociation Constant and Standards for pH of 3-(NMorpholino) Propanesulfonic Acid (MOPS) Buffers from 5 to 55°C (1998)
    Springer
    Journal of solution chemistry 27 (1998), S. 73-87 
    Details
    ISSN: 1572-8927
    Keywords: Dissociation constant ; buffers ; NaMOPS ; temperature dependence ; emf ; Gibbs energy ; enthalpy ; entropy ; heat capacity ; zwitterion ; liquid junction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The second dissociation constant pK2 of 3-(N-morpholino)propanesulfonic acid (MOPS) has been determined at eight temperatures from 5 to 55°C by measurements of the emf of cells without liquid junction, utilizing hydrogen electrodes and silver–silver chloride electrodes. The pK2 has a value of 7.18 ± 0.001 at 25°C and 7.044 ± 0.002 at 37°C. The thermodynamic quantities ΔG°, ΔH°, ΔS°, and ΔC p o have been derived from the temperature coefficients of the pK 2. This buffer at ionic strength I = 0.16 mol-kg−1 close to that of blood serum, has been recommended as a useful secondary pH standard for measurements of physiological fluids. Five buffer solutions with the following compositions were prepared: (a) equimolal mixture of MOPS (0.05 mol-kg−1) + NaMOPS, (0.05 mol-kg−1); (b( MOPS (0.05 mol-kg−1) + NaMOPS (0.05 mol-kg−1) + NaCl (0.05 mol-kg−1); (c) MOPS (0.05 mol-kg−1) + NaMOPS (0.05 mol-kg−1); + NaCl (0.11mol-kg−1); (d) MOPS (0.08 mol-kg−1) + NaMOPS (0.08 mol-kg−1); and (e)MOPS (0.08 mol-kg−1) + NaMOPS (0.08 mol-kg−1) + NaCl (0.08 mol-kg−1).The pH values obtained by using the pH meter + glass electrode assembly are compared with those measured from a flow–junction calomel cell saturated with KCl (cell B), as well as those obtained from cell (A) without liquid junction at 25 and 37°C. The conventional values of the liquid junction potentials E j have been obtained at 25 and 37°C for the physiological phosphate reference solution as well as for the MOPS buffers (d) and (e) mentioned above.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022692629289
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  • 8
    Electronic Resource
    Electronic Resource
    Mössbauer study of highly dilute Pd(Fe) alloys at very low temperatures (1978)
    Springer
    Hyperfine interactions 4 (1978), S. 407-410 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021861
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of chimeric UmuC proteins: identification of regions inSalmonella typhimurium UmuC important for mutagenic activity (1996)
    Springer
    Molecular genetics and genomics 251 (1996), S. 121-129 
    Details
    ISSN: 1617-4623
    Keywords: Escherichia coli ; Salmonella typhimurium ; SOS mutagenesis ; Chimeric proteins ; UmuC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract UnlikeEscherichia coli, the closely related bacteriumSalmonella typhimurium is relatively unresponsive to the mutagenic effects of DNA-damaging agents. Previous experiments have suggested that these phenotypic differences might result from reduced activity of theS. typhimurium UmuC protein. To investigate this possibility, we have taken advantage of the high degree of homology between the UmuC proteins ofE. coli andS. typhimurium and have constructed a series of plasmid-encoded chimeric proteins. The possibility that the phenotypic differences might be due to differential expression of the respective UmuC proteins was eliminated by constructing chimeric proteins that retained the first 25 N-terminal amino acids of either of the UmuC proteins (and presumably the same translational signals), but substituting the remaining 397 C-terminal amino acids with the corresponding segments from the reciprocal operon. Constructs expressing mostlyE. coli UmuC were moderately proficient for mutagenesis whereas those expressing mostlyS. typhimurium UmuC exhibited much lower frequencies of mutation, indicating that the activity of the UmuC protein ofS. typhimurium is indeed curtailed. The regions responsible for this phenotype were more precisely localized by introducing smaller segments of theS. typhimurium UmuC protein into the UmuC protein ofE. coli. While some regions could be interchanged with few or no phenotypic effects, substitution of residues 212–395 and 396–422 ofE. coli UmuC with those fromS. typhimurium resulted in reduced mutability, while substitution of residues 26–59 caused a dramatic loss of activity. We suggest, therefore, that the primary cause for the poor mutability ofS. typhimurium can be attributed to mutations located within residues 26–59 of theS. typhimurium UmuC protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02172909
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  • 10
    Electronic Resource
    Electronic Resource
    Untersuchung zur Stickstoffbestimmung in Stählen (1962)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 190 (1962), S. 81-91 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Die Bestimmung des Stickstoffs in Eisenlegierungen nach dem Säurelösungsverfahren hat zur Voraussetzung, daß der Stickstoff unabhängig davon, in welcher Verbindung er in der Legierung auftritt, beim Lösen in Ammoniumsalz übergeführt wird. Diese Voraussetzung trifft aber nicht in allen Fällen zu. Um festzustellen, wann sie erfüllt ist, wurde zunächst geprüft, ob ein als Eisennitrid ausgeschiedener Stickstoff beim Lösen in nichtoxydierenden Säuren ebenso vollständig zu Ammoniumsalz reduziert wird wie ein im Eisen in fester Lösung vorliegender. Das ist praktisch der Fall. Um diese Versuche zuverlässig durchführen zu können, mußte der Blindwert des Verfahrens auf wenige Mikrogramme herabgesetzt werden. Es wurden außerdem Versuche eingeleitet, um die Reaktionen der weiterhin in Stählen auftretenden stickstoffhaltigen Verbindungen kennen zu lernen. Dazu wurden verschiedene Nitride mit Hilfe der elektrolytischen Isolierung aus an Stickstoff angereicherten Eisenlegierungen freigelegt. Zunächst wurden die in der Literatur als α-Si3N4 und β-Si3N4 bekannten Nitride und das AlN auf diese Weise gewonnen. Während die ersteren in Säure völlig unlöslich sind und auch beim Behandeln mit alkalischen Lösungen kein Ammoniak bilden, läßt sich das AlN in Säuren weitgehend und in Alkalien schnell und vollständig unter Bildung von Ammoniak lösen. Eine schichtweise Untersuchung der an Stickstoff angereicherten Zonen in einer Eisen-Siliciumlegierung bestätigte, daß die Löslichkeit des Siliciumnitrids in festem Eisen so hoch ist, daß bei üblichen Stählen im normalisierten Zustand mit der Bildung dieser Nitride nicht zu rechnen ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00465887
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