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  • 1975-1979  (19)
  • 1965-1969  (40)
  • 1925-1929  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 55 (1966), S. 149-174 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Glaucocystis is an unicellular alga with endosymbiontic blue-green algae and is usually thought to be an apoplastidic Oocystis. However, our light and electron microscopical investigations show, that there is no relationship to Oocystis, since Glaucocystis has two reduced flagella, contractile vacuoles (during the cell division), and a different symmetry of the cell. A survey on the position of the Golgi apparatus in the different groups of algae demonstrates that Glaucocystis is most probably no chlorophycean since its dictyosomes surround the flagellar base and are therefore in contrast to that of green algae in parabasal position. Due to the lack of other specific characteristics as well as own pigments it seems us very difficult to place at present Glaucocystis in the taxonomic system of the algae.
    Notes: Zusammenfassung Glaucocystis ist eine einzellige Alge mit endosymbiontischen Cyanophyceen, die gewöhnlich für eine apoplastidische Oocystis gehalten wird. Gegen diese taxonomische Einordnung sprechen verschiedene Befunde unserer licht- und elektronenmikroskopischen Untersuchungen, unter anderem der Besitz zweier rudimentärer Geißeln, pulsierender Vacuolen (während der Zellteilung) und die Zellsymmetrie. Wie aus einer tabellarischen Übersicht über die Anordnung des Golgi-Apparates in den verschiedenen Algengruppen hervorgeht, ist es sehr unwahrscheinlich, daß Glaucocystis überhaupt eine Chlorophycee ist, denn ihre Dictyosomen liegen im Gegensatz zu denen der Grünalgen ringförmig um die Geißelbasis, sind also parabasal angeordnet. Weil weitere spezifische Merkmale sowie eigene Pigmente fehlen, scheint uns eine taxonomische Einordnung vorerst nicht möglich zu sein.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 54 (1966), S. 229-236 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 57 (1967), S. 196-198 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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  • 4
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Gewöhnlich setzen sich die Flagellaten der Gattung Ochromonas mit einem kurzen Pseudopodium und einem kleinen Gallertpolster fest. Verschiedene Stämme von Ochromonas malhamensis und O. sociabilis bilden jedoch eine zarte Tunica. Diese besteht aus einem 10–20 μm langen, hohlen Stiel und einer becherförmigen Hülle, die einen langen protoplasmatischen Fortsatz und die basale Hälfte der Zelle umschließen. Diese Tunicae wurden oft übersehen; sie werden bei der geringsten Störung verlassen. Die Länge des Stieles, die Tiefe des Bechers und die Dicke der Wände ist stark vom Nährmedium abhängig; die Temperatur hat nur wenig, Licht keinen Einfluß. Der Stiel besteht aus schraubig gewundenen, bandförmigen Fibrillen, die vermutlich aus Cellulose bestehen. Sie spleißen im Bereich des Bechers in feinere Fibrillen (bis zu Elementarfibrillen von einem Durch-messer von 3–3,5 nm) auf. Ähnliche Fibrillen, aber weniger geordnet, kommen auch in den Gallertpolstern von O. danica vor. Die taxonomische Bedeutung dieser Befunde wird kurz diskutiert.
    Notes: Summary Usually the flagellates of the genus Ochromonas attach to a substrate by a short pseudopodium and a little mucilagous knob. Several strains of Ochromonas malhamensis as well as O. sociabilis, yet, produce a delicate tunica consisting of a 10–20 μm long hollow stalk and a cup-shaped envelope which encloses a long protoplasmatic filament and the basal half of the cell respectively. These tunicae, often overlooked, are leaved after the minutest disturbance. The length of the stalk, the depth of the cup, and the thickness of their walls is strongly dependent on the nutrition medium; the temperature has little, the light no influence. The tunica consists in the region of the stalk of helical wound, bandlike, presumably cellulosic fibrils which split in the region of the cup in smaller ones and even in elementary fibrils with a diameter of 3–3.5 nm. Similar fibrils but in an irregular distribution are also observed in the mucilagous knobs produced by O. danica. The taxonomic meaning of these findings is briefly discussed.
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 30 (1926), S. 289-293 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 7 (1967), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary. Pot experiments on the competitive effects of charlock (Sinapis arvensis L.) on oats and wild oat (Avena fatua L.) on barley had the following results:(1) During the period up to tillering there was an appreciable effect of the weeds on crop growth with depression in plant weight of 10–15% from that in the absence of weeds.(2) The greatest competitive effect occurred up to the middle of shooting of the cereals, when there were depressions in plant weight of 25–32%.(3) After this stage, the competitive effects of the weeds were much less in pots with a high nutrient level, and at low nutrient level there was almost no competitive effect.(4) The reduction in growth at the time of weeding was somewhat less at the low nutrient level than at the high nutrient level, and it is concluded that at the high level the competitive ability of the weeds was favoured more than that of the cereal crops.(5) The cereals were not able to overcome the initial damage caused by the weeds even when the weeds were removed at the beginning of tillering. A partial recovery did how ever occur at the high but not at the low nutrient level.(6) Both combinations, oats with charlock and barley with wild oat, behaved similarly, but some differences could be observed. Compétition entre plantes cultivées et mauvaises herbes II. Action des mauvaises herbes annuelles sur les céréales
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 219 (1967), S. 20-29 
    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
    Description / Table of Contents: Summary Effects of gamma radiation of some physical properties of polytetrafluoroethylene resin on four different sorts of PTFE having diverse qualities were estimated. The range of irradiation dose was between 103 and 108 roentgens. The melting point of the polymer, which is determined by DTA, decreases with increasing irradiation dose. The chain scission was estimated by means of the density change of the irradiated PTFE. The chain-length decreases due to the irradiation in air with 5·105 roentgens to the tenth of the starting value. After passing a maximum the elongation at break decreases during irradiation following a hyperbolic function. The tensile strength declines by irradiation dose rates up to 105 roentgens. Higher doses will not influence the tensile values. The decomposition of the PTFE in the presence of air takes place essentially faster than in vacuo, what is evidently to be seen from the more favourable elongations at break and tensile strengths in contrast to the samples irradiated in air, and from the dependence on the density with the irradiation dose. TheG-values of the scission during irradiation in air and in vacuo are estimated and discussed.
    Notes: Zusammenfassung Die Veränderung einiger physikalischer Eigenschaften von PTFÄ nach der Einwirkung von60Co-γ-Strahlung wurde an vier Sorten PTFÄ verschiedener Qualitäten untersucht. Die Strahlendosen lagen zwischen 103 und 108 R. Der durch Differentialthermoanalyse ermittelte Schmelzpunkt des Polymeren nimmt mit steigender Bestrahlungsdosis ab. Die Kettenverkürzung wird an Hand der Dichteänderung des bestrahlten PTFÄ abgeschätzt. Die Kettenlänge sinkt durch Bestrahlung in Luft mit 5·105 R auf den 10. Teil des Ausgangswertes. Die Bruchdehnung sinkt bei Bestrahlung nach Durchlaufen eines Maximums hyperbolisch ab. Die Zugfestigkeit fällt bis zu Strahlendosen von 105 R ab und nimmt dann einen konstanten Wert an. Der Abbau des PTFÄ erfolgt in Gegenwart von Luft wesentlich rascher als im Vakuum, was aus den günstigeren Bruchdehnungen und Zugfestigkeiten gegenüber den an Luft bestrahlten Proben sowie der unterschiedlichen Abhängigkeit der Dichte von der Strahlendosis ersichtlich ist. DieG-Werte der Spaltung bei Bestrahlung an Luft und im Vakuum werden abgeschätzt und diskutiert.
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  • 8
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung Ich wiederhole die Ergebnisse meiner Untersuchungen: 1. Es besteht kein wesentlicher Größenunterschied zwischen dem fossilen Bos taurus primigenius Bojanus und einem großen Teil der lebenden Hausrinder sowie zwischen wilden und gezähmten Formen von Bos grunniens. 2. Hohes Gewicht, große Festigkeit und rauhe Beschaffenheit der Oberfläche sind keine Anzeichen der Wildnatur, sondern Altersmerkmale. 3. Die bestehenden Unterschiede am Skelett sind vielfach zurückzuführen auf die Wirkung der Horngröße. 4. Furchenbildung und verschiedene Beschaffenheit der Oberfläche des Stirnzapfens, sowie Auftreten von Knochenzubildungen an der Basis berechtigen nicht zur Unterscheidung von Arten bzw. Wildformen; sie sind Alterserscheinungen. Auf Grund dieser Merkmale ist daher eine annähernde Altersbestimmung möglich. 5. Es sind demnach bisher keine allgemein gültigen Unterscheidungsinerkmale zwischen wilden und domestizierten Rindern gefunden worden. Diese Bestimmung im Einzelfall ist nur auf Grund der Unterschiede bezüglich Größe und Form des Hornes möglich.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 28 (1977), S. 117-127 
    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.
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