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  • Springer  (4,304)
  • 2005-2009
  • 1980-1984
  • 1965-1969  (4,304)
  • 1968  (2,489)
  • 1966  (1,815)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 56 (1968), S. 722-728 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein Mikroverfahren zur Phasentitration wurde beschrieben. Man kann mit 0,1 ml Untersuchungslösung auskommen. Die Ergebnisse für 141 synthetische Gemische aus Äthanol und verschiedenen Geschmacks- und Geruchsstoffen (ätherischen Ölen) wurden mitgeteilt.
    Notes: Summary A micromethod for phase titration is described. The volume of solution used in the titration may be as little as 0.1 ml. Results for phase titrations of 141 synthetic mixtures containing ethanol and a variety of artificial flavoring and perfuming agents are presented.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Antonie van Leeuwenhoek 34 (1968), S. 173-182 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study has been made of some chemical and ultrastructural changes that occur in the hyphal, arthrospore and sporangiospore walls ofMucor ramannianus during lysis by a soil streptomycete. Arthrospore and hyphal walls, which were shown to contain chitin, chitosan, other polysaccharides and phosphate (principally as polyphosphate), were lysed by culture fluid of the streptomycete after this organism had been grown on the same material. Alcohol-insoluble material found in the supernatants of the incubation mixtures gave on hydrolysis glucosamine, galactose, mannose and fucose. No laminarinase activity was detected in these culture fluids. Culture fluids of the streptomycete after growth on chitin and chitosan were also found to lyse the walls of arthrospores and hyphae. Despite the chemical similarities the walls were very different in thin section. A major component in the sporangiospore walls was glucan and an active laminarinase was shown to be present in the culture fluids of the streptomycete after growth on them. Further, ultrathin sections showed that an inner fibrillar layer of the sporangiospore wall was lysed leaving an outer electron-dense layer.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of structural chemistry 9 (1968), S. 149-152 
    ISSN: 1573-8779
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The structure of hydrofluorides with the composition MeF2 · HF(Me=Sr, Ba) includes two anions: F− and HF2 − with a linear hydrogen bond. In SrF2 · HF, the hydrogen bond is characterized by a more asymmetrical position of the proton than in BaF2 · HF. Increasing the number of added HF molecules leads to the formation of two bifluoride ions in the compounds CaF2 · 2HF and SrF2 · 2.5HF. The hydrogen bond in this case is also nonsymmetrical, and the average F−H distance is equal to 1.17 A. Thus, the hydrogen bond in these compounds is of the same order as in KF · 2HF (rF−F=2.33 A) [12],i.e., weaker than in KF · HF (rF−F=2.26 A) [13], but stronger than in solid HF (rF−F=2.49 A) [14]. A structure with two polyfluoride anions evidently corresponds to the compound BaF2 · 3HF.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Plant systematics and evolution 115 (1968), S. 6-17 
    ISSN: 1615-6110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Phenotypically there appeared to exist no diversity in different individual plants in a population ofCalotropis procera. The diversity in imbibition and germination behaviour of seeds from different plants was revealed only after detailed studies were undertaken. Seeds from six individual plants were collected and stored separately for a period of two years. Ordinarily the seeds of this species did not exhibit any dormancy and were found to germinate immediately after harvest. Two years old seeds did not loose their viability in any of the six lots indicated above. It was discovered that the weight and size of seeds, the rate of imbibition of water, the amount of water imbibed, the loss of water upon drying, the rate of germination, the percentage of germination, and the germination behaviour in continuous illumination and total darkness, all exhibited diversity to some extent in the six lots studied. It was evident that there did not exist seeds exhibiting homogeneous behaviour in a population ofCalotropis procera.
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  • 5
    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
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  • 6
    Publication Date: 1968-10-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 7
    Publication Date: 1968-07-01
    Print ISSN: 0026-3672
    Electronic ISSN: 1436-5073
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 216 (1968), S. 172-182 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine structure of the excited 32 P 3/2- and 42 P 3/2-state of Na23 has been investigated in a level-crossing-experiment by means of a detailed analysis of the dependence of the scattered resonance light as a function of the magnetic field. From the experimental curves the following results for the hyperfine structure constantsA andB and for the lifetimesΤ were deduced 32 P 3/2-state: 42 P 3/2-state:A=18.65(10)Mc/sA=6.006(30)g j/1.334Mc/sB=2.82(30)Mc/sB=0.86 (9)g j/1.334Mc/sΤ=1.60 (3) · 10−8sΤ=6.56 (25)1.334/gj·10−8 s. The nuclear electric quadrupolemoment of Na23 derived from these values isQ=0,097 · 10−24 cm2, where the Sternheimer-correction has been applied.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 217 (1968), S. 282-293 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The decay of125m Xe produced by the reaction122Te(α, n)125m Xe using a target enriched in122Te (95.4%) and the decay of127m Xe produced by the reaction127J(d, 2n)127m Xe have been investigated: 125m Xe decays with a half-life ofT 1/2=(56±3) sec by ayy- cascade withE γ1=(140.4 ±0.5) keV andE γ2=(110.5 ±0.5) keV. The experimental conversion coefficients yield multipolarities ofE3 for the 140.4 keV isomeric transition and predominantlyM1 for the 110.5 keV-transition. 127m Xe decays with a half-life ofT 1/2=(71±2) sec. The decay also proceeds by aγγ-cascade with an isomeric E3 transition ofE γ1=(172.5±0.3) keV and a predominantlyM1 transition ofE γ2=(124.6±0.3) keV. In the decay of127g Xe an additional branching of the electron capture to a level at (618.1±0.3) keV was observed. The relative probability forK-captureP K618/PK375=0.40 ±0.07 yields a total transition energyQ EC=(664 ±4)keV. A spin of 1/2+ was assigned to the ground state.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 5 (1966), S. 371-379 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Résumé La linie ESRg=1,957, caractéristique pour la poudre de ZnO propre activée, a été recherchée. On peut montrer, que la linie bien connue consiste en deux parts (g h=1,9555 etg a=1,9580). Les deux centres paramagnétiques peuvent identifiés en comparant des qualités de luminescence. La part „h” avec lag-valeurg h plus petit provient des pièges à trous remplis, c.-à-d. des ions oxygènes interstitiels. Le deuxième signal partiel „a” provient des activateurs pas ionisés, c.-à-d. des défauts oxygènes occupés d'un électron.
    Abstract: Abstract The ESR-lineg=1,957 of self-activated ZnO-powder is investigated. It can be shown that the well-known ZnO-line consists of two parts (g h=1,9555 andg a=1,9580). The two paramagnetic centers can be identified by considering corresponding luminescence properties. The part „h” with the lowerg-valueg h is given by the filled hole traps, i.e. by oxygen-ions on interstitual places. The second part of the ESR-signal results from activators, which are not ionized, i.e. oxygen defects filled by one electron.
    Notes: Zusammenfassung Es wird die für eigenaktiviertes ZnO-Pulver charakteristische ESR-Linie beig=1,957 untersucht. Es kann gezeigt werden, daß die bekannte ZnO-Linie aus zwei Anteilen besteht (g h=1,9555 undg a=1,9580). Die beiden paramagnetischen Zentren können durch Analogien zu Lumineszenzeigenschaften identifiziert werden. Der Anteil „h” mit dem kleinereng-Faktorg h stammt von den gefüllten Löcherhaftstellen, d. h. von: Sauerstoff-Zwischengitterionen. Das zweite Teilsignal „a” rührt von den nicht-ionisierten Aktivatoren, d. h. von mit einem Elektron besetzten Sauerstofflücken her.
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