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  • 1
    Digitale Medien
    Digitale Medien
    Food preference, food quality and diets of three herbivorous gastropods (Trochidae: Tegula) in a temperate kelp forest habitat (1984)
    Springer
    Oecologia 62 (1984), S. 47-52 
    Details
    ISSN: 1432-1939
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The relationship between food preference and food quality (i.e. a food's contribution to growth and reproductive development) was examined in the laboratory for 3 species of herbivorous kelp forest gastropods (Tegula). The preference hierarchies of the 3 Tegula for 6 common algal species are the same: giant kelp (Macrocystis) is the most preferred food and brown algae are consumed at higher rates than red algae. Despite their strong preference for Macrocystis, the 3 species had significantly greater growth and/or reproductive development on a mixed-algae diet than on either brown or red algae alone. Laboratory preferences of the snails did not correspond closely with caloric content, estimated availability or quality of the algal species used in this study. However, the 3 Tegula are subject to strong benthic predation and Macrocystis provides an important spatial refuge in nature. The potential role of non-nutritional factors such as predator avoidance on the formation of food preferences is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00377371
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  • 2
    Digitale Medien
    Digitale Medien
    Generation of dislocations introduced by bending stress in a Si wafer (1983)
    Springer
    Applied physics 31 (1983), S. 109-114 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.70 ; 65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Distribution and morphology for dislocations introduced in (001) Si wafers subjected to bending stress at 800°, 900°, and 1100°C were investigated. For wafers bent around a [110] axis at 900° and 1100°C, straight dislocations appeared along the [110] direction only near the neutral plane, and were absent at the surfaces where bending stress is greatest. However, for wafers bent at 800 °C, such straight dislocations were not formed. Dependence of the dislocation distribution and morphology on heat treatment temperature is explained on the basis of interaction between bending stress and SiO2 precipitates introduced in bulk. Also, it was found that the straight [110] dislocations remained still near the neutral plane, even when additional reverse bending stress was applied around an axis parallel to the dislocations, but were transfered toward the tensile surface by bending around an axis normal to the dislocation direction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00616313
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  • 3
    Digitale Medien
    Digitale Medien
    Verdrillte cholesterische Struktur in festen Filmen aus Poly(γ-methyl-D-glutamat) (1979)
    Springer
    Colloid & polymer science 257 (1979), S. 1255-1255 
    Details
    ISSN: 1435-1536
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01517264
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Primary cell cultures isolated from Penaeus monodon prawns (1999)
    Springer
    Methods in cell science 21 (1999), S. 219-223 
    Details
    ISSN: 1573-0603
    Schlagwort(e): In vitro ; Cell culture ; Prawn tissues
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract We have devised a cell culture system for Penaeus monodon prawn cells that uses a defined synthetic medium. Organs were removed from adult prawns ranging in size from 13--19cm rostrum-to-telson length. Cultures consisted of either a blend of hematopoietic and lymphoid cells or ovarian cells. The cells divide rapidly in culture, doubling on average once per week for 5 to 6 weeks. These cultures continue to survive for at least 5 months but the rates of cell division are low after the first 5--6 weeks. In the literature, unicellular eukaryotic marine organisms such as chytrids may contaminate marine cell cultures. In some cases these eukaryotic contaminants may be difficult to distinguish from prawn cells unless detailed ultrastructure or characteristic developmental stages such as zoospores can be observed. Alternatively, we prepared molecular probes from repeated DNA sequences 100--400 bp in length in the P. monodon genome. These species-specific probes were hybridised to genomic DNA from cell culture to confirm proliferation of P. monodon cells in our cultures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009864212013
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  • 5
    Digitale Medien
    Digitale Medien
    Spectral observations of impact dark spots (1994)
    Springer
    Earth, moon and planets 66 (1994), S. 19-27 
    Details
    ISSN: 1573-0794
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract We carried out a spectral observation of traces of the comet impacts within the wavelength region between 440 and 830 nm. Three dark spots of fragments K, E, and G impact sites were investigated. The spectrum of these dark spots shows no special emission or absorption lines in this observation. The global spectral feature resembles that of Jovian zone cloud rather than that of the belt. While the continuum reflectivity of the dark spots of K and E sites is less than 0.42 at 600 nm, that of the G site is 0.33. These values should be interpreted as an upper limits because of the influence of atmospheric seeing. The equivalent width of the absorption lines at the K sites is also derived. Both the continuum reflectivity and the equivalent width of the dark spots are smaller than those of any Jovian zonal cloud. This indicates that the dark spots are low-albedo cloud formed at the upper atmosphere.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00612881
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  • 6
    Digitale Medien
    Digitale Medien
    Observations of C2 Molecules in the Coma of Comets at Mitaka (1997)
    Springer
    Earth, moon and planets 78 (1997), S. 143-148 
    Details
    ISSN: 1573-0794
    Schlagwort(e): C2 ; Production rate ; asymmetrical coma ; C/1996 B2 ; C/1995 O1
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract In order to monitor the various phenomena of comets, we continuously made the near-nucleus imaging observations of comets at National Astronomical Observatory, Mitaka. Here we report on the results of the observations of two spectacular comets. One is the analysis of photometry of C2 emission images in the coma of comet Hyakutake (C/1996 B2). By comparing the production rates of C2 radicals with C2H2 molecules, we conclude that the most C2 radicals were originated from C2H2, while some of them might be produced from other parents. The second item is the analysis of the morphology of C2 emission images in the coma of comet Hale-Bopp(C/1995 O1). By applying a ring masking technique, we detected asymmetrical distribution of the C2 molecules. The results of these two comets might suggest that a portion of C2 radicals were formed by the disintegration of the small organic dust grains, like the so-called CHON particles.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006237210191
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  • 7
    Digitale Medien
    Digitale Medien
    Wide Field Imaging of Ion Tail of Comet C/Hale–Bopp (1997)
    Springer
    Earth, moon and planets 77 (1997), S. 265-269 
    Details
    ISSN: 1573-0794
    Schlagwort(e): Cometary plasma ; solar wind ; interplanetary magnetic field
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract A sequential imaging observation of the ion tail of Comet C/Hale-Bopp 1995O1 was carried out in February–March 1997 with a wide-field CCD imaging camera using narrow band filters for two ion species; CO+ and H2O+ along with those for blue and red continuum. From the surface photometry of the ion tail of two species, we derived a relationship between plasma density and distance from the nucleus. The local velocity of the ion flow as a function of the distance from the nucleus was also estimated on the basis of some assumptions. We report preliminary results of our analysis, and discuss some characteristics of cometary plasma and its interaction with interplanetary magnetic field (IMF). May the source be with you!
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006271431067
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  • 8
    Digitale Medien
    Digitale Medien
    Observations of the Dust Cloud in Comet Hale-Bopp on 9–11 May 1997 (1997)
    Springer
    Earth, moon and planets 78 (1997), S. 229-233 
    Details
    ISSN: 1573-0794
    Schlagwort(e): Comet Hale-Bopp ; cometary dust condensation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract During our monitoring observations of comet Hale-Bopp, we found several sporadic ejections of dust from the nucleus. The most prominent ejection was observed on May 6–9, 1997, in the post-perihelion phase of the apparition. In this paper, we report preliminary analysis of this event, in which the total mass of the dust cloud is estimated to be 1.6 × 1011 g.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006253117168
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  • 9
    Digitale Medien
    Digitale Medien
    Crosslinked hydroxypropyl cellulose films retaining cholesteric liquid crystalline order Part III Tensile creep behaviour in vacuo (1999)
    Springer
    Journal of materials science 34 (1999), S. 6151-6155 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The crosslinked and uncrosslinked hydroxypropyl cellulose solid films retaining the cholesteric liquid crystalline order were cast from the liquid crystalline solutions in methanol. The tensile creep behaviour of the films was determined and the deformability of the films and the size of the liquid crystalline domains in the films were discussed. There was a great difference in the creep behaviour between the crosslinked and uncrosslinked films; both kinds of the films exhibited a linear increase in strain with time, however, only the crosslinked films exhibited a constant region of strain after a given time. The constant strain depended on the crosslinking conditions: The strain decreased with increasing crosslinking agent concentration. The Eyring activation volume (V) could be evaluated. V for the crosslinked films was smaller than that for the uncrosslinked films; V decreased exponentially with increasing crosslinking agent concentration. Our data suggested that the inter-domain crosslinking occurred more or less. There was a critical stress where V changed; V in the lower stress region was greater than that in the higher stress region.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004778122362
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  • 10
    Digitale Medien
    Digitale Medien
    Cloning and characterization of a repetitive sequence fromPneumocystis carinii (1992)
    Springer
    Parasitology research 78 (1992), S. 23-27 
    Details
    ISSN: 1432-1955
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Four repetitive sequence clones measuring 10.9–23.4 kb in length were isolated from the genomic library ofPneumocystis carinii. Restriction enzymes mapping and cross-hybridization studies revealed that these clones are interrelated and that they derive from the common repeat unit, which is specific forP. carinii. Dot-blot analysis suggested that the copy number of the repeat sequence is about 100, assuming that the genome size is 1.5×107 bp. Interestingly, the repetition unit extended over at least 23.4 kb and included long, 5.2-kb inverted repeats, for example, A-B-A′-C, in which A′ is the inversion of A.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00936176
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