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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Biomedical engineering 11 (1977), S. 35-37 
    ISSN: 1573-8256
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Biomedical engineering 16 (1982), S. 143-148 
    ISSN: 1573-8256
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
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  • 3
    ISSN: 1573-871X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A relative method is proposed for the direct determination of the set of thermal characteristics for the free-flowing masses of materials in the process of heating, said method based on the application of the principle of a diathermic shell.
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  • 4
    ISSN: 1573-1561
    Keywords: Centaurea maculosa ; sesquiterpene lactone ; cnicin ; host-plant selection ; oviposition behavior ; antifeedant ; attractant ; Spodoptera littoralis ; Agapeta zoegana ; Stenodes straminea ; Pterolonche inspersa ; Lepidoptera ; Noctuidae ; Cochylidae ; Pterolonchidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The sesquiterpene lactone cnicin was extracted fromCentaurea maculosa andCentaurea vallesiaca. We examined its effects on the ovipositional response and larval development of generalist and specialist insect herbivores associated withC. maculosa. For the oviposition trials, three plant species (C. maculosa, Achillea millefolium, andCichorium intybus), half of which were sprayed with 3% of cnicin, were exposed to the specialist mothsStenodes straminea, Agapeta zoegana, andPterolonche inspersa in field cages. All three species significantly preferredC. maculosa to other plants andP. inspersa significantly preferred cnicin-sprayed plants to untreated plants for oviposition. Tested over all species, cnicin significantly increased the number of eggs laid on a given plant. A larval diet test examined the toxicity of cnicin for larvae of the generalist noctuid mothSpodoptera littoralis. Cnicin concentrations of 3% and 6% were lethal and 1% and 0.5% seriously inhibited growth and development. The larvae of theC. maculosa specialistStenodes straminea survived at 6% cnicin, but none of the pupae hatched.Agapeta zoegana was able to survive at 1% and 3% cnicin. Both specialists had difficulties with the artificial diet, but weight increase and survival was not further reduced when cnicin was present compared with on the control diet. In conclusion, cnicin influenced host recognition by the specialist species, and larvae of the generalist did not survive on natural levels of cnicin. Growth and survival of the specialist were not influenced by cnicin but were considerably hampered on artificial diet.
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  • 5
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that the conductivity onset in cold deposited Hg films on glass substrates covered with a SiO layer corresponds to te film thickness of 4–5 Å in a contrast to films deposited on pure glass, where the conductivity onset can be observed only at 10–15 times higher thicknesses. Study of superconducting properties of films is also presented. We believe that chemical bonds between metallic atoms themselves and their chemical interaction with atoms of the substrate are very important for formation of the film structure and responsible for a completely different behavior of films deposited onto different substrates.
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  • 6
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present an experimental study of cold deposited Pb films. Experimental results show that high values of the film thickness corresponding to the onset of electrical conductivity (55–65 Å) cannot be explained by the formation of the island structure. It means that metastable insulating modification of Pb is formed in this case. All the results are in good agreement with the recently proposed model of the insulating modifications of metals [I. A. Parshinet al., Phys. Rev. B 54, 1308 (1996) and A. V. Danilovet al., J. of Low Temp. Phys. 103, 35 (1996)].
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  • 7
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present an experimental study of the current induced destruction of superconductivity in films of type-1 superconductors. The most interesting aspect of these experiments is the possibility to observe and investigate different mechanisms of the superconductivity destruction depending on the ratio of the sample thickness d to the coherence length ξ(T).If d/ξ(T) 〈 4.5 we observe, above a critical current value, a resistive state throughout the section of the film, but in the case of d/ξ(T) 〉 4.5 the destruction of superconductivity starts, as in bulk samples, with the formation of a normal shell along the outer surface of the cylindrical sample together with a layer of the two-dimensional mixed state at the inner surface. Investigations on films allowed for the first time to measure the thickness of the two-dimensional mixed state.
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  • 8
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present measurements of critical currents and critical magnetic fields in cylindrical indium films. The most interesting result is that the ratio of the experimental critical current Ic1 to Silsbee's critical value Ic0 practically does not depend on temperature. This ratio was strongly dependent on the film thickness changing from Ic1 ≈ 0.18Ico for the film thickness d = 0.3μm to Ic1 ≈ 1.3Ico for d = 5.5μm. These results cannot be explained in the framework of the existing theoretical models.
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  • 9
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Numerical calculations of superheating magnetic fields and superheating currents for superconducting slabs for a wide range of the sample thickness are presented. The calculations were made for low values of Ginzburg-Landau parameter κ, i.e., for type-1 superconductors. We propose also experimental procedures to measure superheating fields and currents in films and bulk samples.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Parasitology research 45 (1974), S. 63-75 
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Un nouvean schéma est proposé pour l'évolution des Coccidiomorphes de Vertébrés. Ceux-ci seraient issus de parasites du coelome ou de dérivés mésoblastiques d'Invertébrés qui se seraient adaptés, chez des hôtes vertébrés, à des localisations de même origine, puis à des tissus plus spécialisés, tels que l'endoderme digestif ou le parenchyme hépatique. Les deux lignées Adeleidea et Eimeridae sont déjà séparées chez l'hôte vertébré. Dans le schéma proposé, les Adeleidea comprennent: a) und branche principale qui a donné successivementHaemogregarina, Dactylosoma puis les Piroplasmes,Karyolysus et enfinHepatozoon; b) un rameau aboutissant àKlossiella qui serait issu directement d'un parasite d'Invertébré. Chez les Eimeridea, deux branches principales sont distinguées: a) les Coccidies proprement dites comprenant, par ordre de spécialisation croissante: les Lankesterellidea,Tyzzeria, les Coccidies à oocystes rësistants et à kystes, les Coccidies à oocystes résistants, sans kystes; b) les Hemosporidies considérées comme des parasites d'Insectes dont une partie du cycle s'est établie chez des hôtes vertébrés. Les principaux arguments donnés en faveur de cette hypothèse portent sur l'évolution du sporozoïte et de ses dérivés, sur le caractère spécialisé des Coccidies monoxènes de l'épithélium intestinal et sur une comparaison avec la phylogénie d'autres groupes parasitaires. Bien que ces hypothèses ne soient fondées que sur la morphologie et la biologie des parasites, la corrélation avec le spectre d'hôtes est honne. Les Chéloniens et les Crocodiliens, hôtes d'Haemogregarina sont précisément les deux groupes de Reptiles, dont les représentants de l'ère secondaire sont presque identiques aux formes actuelles. Les autres Adeleidea sont, pour la plupart, restées inféodées aux animaux à sang froid apparus au tertiaire, sauf certainsHepatozoon et des parasites très spécialisés tels queKlossiella et les Piroplasmes qui ont pour hôtes vertébrés des Mammifères. Les Eimeridea sont tout d'abord des parasites de Vertébrés à sang froid (Lankesterellidae), la conquête des Vertébrés à sang chaud étant le fait des groupes les plus évolués (Coccidies à oocystes résistants).
    Notes: Summary A new scheme is proposed for the phylogeny of the Coccidiomorpha of Vertebrates. This group appears to have evolved from parasites of the coelomic cavity or from tissues of mesoblastic origin in the invertebrates. In the course of their adaptation to the vertebrate host the parasites have become licalized firstly in tissues of the same origin (e.g., reticulo-endothelial and blood cells), but later have become adapted further to more specialized tissues such as the endoderm of the digestive tract and of the hepatic parenchyma. Both Adeleidea and Eimeridea which have already become separated in the vertebrates appear to have arisen from two stems. In the present scheme we suggest that the Adeleidea form two divisions: a) a main branch which has given rise successively toHaemogregarina, Dactylosoma and the Piroplasms,Karyolysus and finally toHepatozoon; b) a line which gives rise toKlossiella which may have originated directly from a parasite of Invertebrates. In the Eimeridea two divisions may be distinguished: a) the true Coccidia which include in increasing order of specialization the Lankesterellidae,Tyzzeria, Coccidia with resistant oocysts and cysts, Coccidia with resistant oocysts but no cysts; b) Haemosporidia which are considered to be parasites of insects and in which part of the life cycle has become established in vertebrate hosts. The principal arguments which are presented in favour of these hypotheses are based on the evolution of the sporozoïte and its derivatives, on the specialized characters of monoxenous (loccidia of the intestinal epithelium and on a comparison with the phylogeny of other groups of parasitic organisms.
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