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Digitale Medien

Anisotropy and temperature dependence of small angle neutron scattering from silicon-oxide precipitates in silicon (1991)

Sieger, D. ; Tietze-Jaensch, H. ; Geick, R. ; [weitere]

Springer

Applied physics 53 (1991), S. 422-425

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ISSN: 1432-0630

Schlagwort(e): 61.12Dw ; 72.10 ; 78.50G

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract Czochralski grown silicon crystals contain interstitially dissolved oxygen which diffuses on heating to form precipitates of silica. We have examined these precipitates by small angle neutron scattering (SANS) in the Q-range 0.05 Å−1〈Q〈0.4 Å−1. The obtained SANS patterns reveal pronounced anisotropic intensity distributions which resemble the symmetry of the host crystal. The SANS spectra show an anisotropic central peak at Q〈0.1 Å−1 due to the single particle shape and a number of weak intensities for larger Q-values. These weak side maxima are considered correlation peaks or quasi-elastic interference peaks. They show, however, an unexpected and distinct temperature dependence: with decreasing temperature below values of 220 K their intensity is lost slowly, but reversibly. At T = 50 K only the central peak from the single-particle scattering remains unchanged. Upon heating, the correlation peaks regain their former value of intensity and Q-position without any evidence of thermal hysteresis.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00348156

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Digitale Medien

The Hoher List observations of the occultation of 28 Sagittarii by Titan (1991)

Hoffmann, M. ; Geyer, E. H.

Springer

Earth, moon and planets 52 (1991), S. 83-86

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ISSN: 1573-0794

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract Observations of the occultation of 28 Sgr by Titan are presented. Apparently being located close to the central line of the occultation track, a double peaked central flash was observed. Some characteristic times of the phenomenon are given.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00113833

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Digitale Medien

Immunological recognition of larvalTaenia crassiceps glycolipids by sera from parasite-infected mice (1991)

Kunz, J. ; Baumeister, S. ; Dennis, R. D. ; [weitere]

Springer

Parasitology research 77 (1991), S. 443-447

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ISSN: 1432-1955

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin

Notizen: Abstract The isolation and purification of a neutral glycolipid fraction fromTaenia crassiceps metacestodes (KBS strain), harvested from both male and female NMRI mice at 70–80 days following intraperitoneal infection, revealed 24 thin-layer chromatography-designated glycolipid bands. The glycolipids were defined as ceramide mono-(n=3), di-(n=3), tri-(n=4), tetra-(n=5), and 〉tetrasaccharides (n=9) according to their running properties as defined by thin-layer chromatography against standards of known structure. The defined glycolipids were tested for immunoreactivity with sera from noninfected andT. crassiceps-infected NMRI mice (intraperitoneal injection or implantation of 15 larvae/animal) using the enzyme-linked immunosorbent assay (ELISA) until day 33 p.i. (IgM and IgG reaction) and high-performance thin-layer chromatography (HPTLC) combined with immunostaining (IgG reaction) until day 7 p.i. ELISA-determined IgM and IgG titres were significantly elevated from day 5 p.i. Immunostaining revealed early reactivity for certain ceramide tetra- and 〉tetrasaccharides (n=6) on day 3 p.i. From day 5 p.i. onwards, nearly all glycolipids, including ceramide mono-and disaccharides, were recognized by the sera from metacestode-challenged mice. On day 7 p.i., a total of 22 bands were serologically active; of these, a considerable number (n=10) showed increased staining intensity. Remarkably, in many cases (10 of 20), 3 glycolipids (tetra-and 〉tetrasaccharides) were weakly recognized by mouse sera taken before infection.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00931642

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