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  • 1
    Digitale Medien
    Digitale Medien
    Ultralong minority-carrier lifetimes in GaAs grown by low-pressure organometallic vapor phase epitaxy (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1992-1994 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have measured minority-carrier lifetimes of up to 4.9 μs in GaAs layers that have been grown by low-pressure organometallic vapor phase epitaxy. These lifetimes, representing a major improvement compared with previously obtained results, are governed by radiative recombination processes. Carbon incorporation during crystal growth at low arsine partial pressures is of prime importance in understanding the origin of these very long lifetimes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101192
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  • 2
    Digitale Medien
    Digitale Medien
    Insect Pests of Sugar Beet (1987)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Entomology 32 (1987), S. 341-360 
    Details
    ISSN: 0066-4170
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.en.32.010187.002013
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  • 3
    Digitale Medien
    Digitale Medien
    The Diploidised Meiosis of Tetraploid Beta macrocarpa and its Possible Application in Breeding Sugar Beet (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 103 (1989), S. 0 
    Details
    ISSN: 1439-0523
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Accessions of Beta macrocarpa Guss., collected on the Canary Islands, were tetraploid (2n = 36). Three of these accessions were studied in detail. The plants were rather uniform in their morphological appearance, both within and between accessions, and were annual and fully self-compatible. Meiosis was completely diploidised, suggesting an alloploid nature of the tetraploid species. Crosses with diploid B. vulgaris yielded triploid hybrids which were sterile or nearly so; a few descendants of such hybrids were highly aneuploid. Crosses between tetraploid B. macrocarpa and autotetraploid cytotypes of B. vulgaris showed variable results, only part of these crosses yielded tetraploid hybrids. The tetraploid hybrids exhibited somewhat higher fertility than the triploids. An F2 generation showed partial hybrid dwarfness, partial fertility and segregation for carliness and coloration of the hypocotyl. All hybrids had multivalents at meiosis (averages: 2.5—5.4 multivalents per pollen mother cell), indicating suppression of the diploidised meiosis. The possibilities of application of the diploidised meiosis in breeding sugar beet are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1439-0523.1989.tb00371.x
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  • 4
    Digitale Medien
    Digitale Medien
    Hard coatings for optically bistable interference filters (1989)
    Springer
    Applied physics 48 (1989), S. 101-104 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65.Pc ; 68.55.Wy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have fabricated optically bistable interference filters from layers of TiO2 and SiO2 vapour deposited on glass substrates. An experimental comparison with the more conventional ZnSe filters is presented. Our devices are superior in durability and switching contrast, equal in switching threshold, and slower in switching time.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692133
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  • 5
    Digitale Medien
    Digitale Medien
    Complexity out of a simple structure: The intricate multistable behaviour of an optical resonator filled with sodium atoms (1989)
    Springer
    Applied physics 49 (1989), S. 191-199 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65.P
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A Fabry-Perot resonator containing sodium atoms displays a variety of switching phenomena even in the simplified case of homogeneous broadening. The processes are shown to arise from the combined effects of Zeeman pumping and electronic excitation. A simple model can clarify the dazzling complexity of the observed phenomena.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00714635
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  • 6
    Digitale Medien
    Digitale Medien
    Analysis of optical bistability through rapid water desorption from hard coatings (1989)
    Springer
    Applied physics 48 (1989), S. 467-470 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65.Pc ; 68.55.Wy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The mechanism of optical bistability in TiO2/SiO2 nonlinear interference filters is investigated and found to be due to water sorption in the pores of the material.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694681
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  • 7
    Digitale Medien
    Digitale Medien
    Demonstration of atrial natriuretic peptide/cardiodilatin (ANP/CDD)-immunoreactivity in the salt gland of the pekin duck (1989)
    Springer
    Anatomy and embryology 179 (1989), S. 465-469 
    Details
    ISSN: 1432-0568
    Schlagwort(e): Atrial natriuretic peptide ; Pekin duck ; Salt gland ; Immunocytochemistry ; High performance liquid chromatography ; Radioimmunoassay
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary A novel peptide hormone, atrial natriuretic factor/cardiodilatin (ANP/CDD), was recently isolated and characterized from mammalian heart. Its presence has been demonstrated in several organs that contribute to water and sodium homeostasis, such as salivary glands. This study demonstrates the presence of ANP/CDD immunoreactivity in the salt gland of Pekin ducks by high performance liquid chromatography, radioimmunoassay and immunocytochemistry, using a specific antibody against atriopeptide I. A small number of distinct, ovoid or cuboid shaped ANP/CDD-immunoreactive cells were localized in the connective tissue surrounding and separating the central secretory tubules, whereas no immunostaining was observed in the peripheral tubules. Salt glands of ducks that were adapted to salt water revealed a significant hypertrophy of their secretory lobules. However, no differences were found between the number or localization of immunoreactive cells in the salt gland of salt water-acclimatized ducks and non-stimulated glands of ducks that were housed with ad libitum access to fresh water. Our results indicate that ANP/CDD may play a role in the regulation of sodium secretion in the salt gland of aquatic birds.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00319589
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  • 8
    Digitale Medien
    Digitale Medien
    Is motilin a cerebellar peptide in the rat? (1986)
    Springer
    Anatomy and embryology 173 (1986), S. 371-376 
    Details
    ISSN: 1432-0568
    Schlagwort(e): Motilin-like immunoreactivity ; RIA ; HPLC ; Cat ; Intestine ; Rat ; Cerebellum ; Purkinje cells ; Dendrites ; Neocortex ; Pyramidal cells ; Hippocampus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Motilin was demonstrated by the immunoperoxidase technique in endocrine cells of the gastrointestinal tract using several specific antisera. Motilin-like immunoreactivity could only be demonstrated with one of these antisera and was observed in Purkinje cells and dendrites of the cerebellum, in pyramidal cells and dendrites of the cerebral cortex and in dendrites of the CA3 field of the hippocampus of the rat. Very low motilin-like immunoreactivity was found in cerebellum as well as in cerebral cortex using radioimmunoassay. However, using reverse phase liquid chromatography combined with UV-detection and radioimmunoassay, no peak of a peptide corresponding to synthetic motilin was detectable in rat cerebellar extracts, in contrast to findings in rat duodenum. The results do not suggest that motilin is an intrinsic neuroactive substance of the cerebellum.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00318921
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  • 9
    Digitale Medien
    Digitale Medien
    The morphology of lipopigment granules in oligodendrocytes of the cerebellum and spinal cord and in Schwann cells of theN. ischiadicus of the cat, Japanese waltzing mouse, and albino mouse (1985)
    Springer
    Acta neuropathologica 65 (1985), S. 330-334 
    Details
    ISSN: 1432-0533
    Schlagwort(e): Lipopigment bodies ; Oligodendrocytes, Schwann cells ; Cerebellum, spinal cord,N. ischiadicus ; Cat, albino mouse, Japanese waltzing mouse
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In the oligodendrocytes of cerebellum and spinal cord and in the Schwann cells of peripheral nerves of cat, albino mouse, and Japanese waltzing mouse lipopigment bodies of different size and shape are deposited, which exhibit a characteristic internal structure. The following three subtypes can be distinguished: (1) Granules completely surrounded by a membrane and containing regularly speced lamellae, (2) granules consisting of a granular matrix with elucidations, and (3) granules with bifurcating stacks of lamellae. Thus, their structure is distinct from that found in nerve cells and other glial cells and allows the diagnosis of oligodendrocyte or Schwann cell. The significance of these granules in relation to function and aging is briefly discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00687017
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  • 10
    Digitale Medien
    Digitale Medien
    Malignant and normally developing trophoblastic cells of human placenta display different characteristics defined by histochemical and biochemical mapping of endogenous lectins (1989)
    Springer
    Histochemistry and cell biology 92 (1989), S. 283-289 
    Details
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Trophoblastic cells with their strictly controlled propensity for invasive growth hereby bear limited resemblance to malignant cells. Therefore, detailed description of molecular characteristics of this cell type in comparison to histologically related tumor cells may aid in defining physiologically relevant differences. In view of the potential importance of selective protein-carbohydrate interactions in recognitive processes, labelled neoglycoproteins were employed to evaluate systematically the presence and distribution of sugar receptors in tumor cells of chorionepithelioma and in trophoblastic cells of an early stage of gestation. Control reactions in glycohistochemistry, involving prolonged incubation, pH variation and use of nucleotides excluded the possiblity that glycosidases or glycosyltransferases grovern the sugar-specific binding to the tissue sections. Pronounced differences were detected in the expression of receptors (lectins) for α- and β-glucosides as well as for N-acetylgalactosamine and N-acetylglucosamine. Further differences were revealed by probing both types of tissue with lactosylated, fucosylated, xylosylated and sialylated carrier protein. Upon developmental maturation of the normal cells in placenta the extent of binding of the neoglyco-proteins decreased. The glycohistochemical differences between malignant and normally developing trophoblastic cells were found to be reflected in the alteration of expression of certain endogenous lectins, as ascertained by affinity chromatography and gel electrophoretic analysis. Consequently, we assume that the transient presence of certain endogenous lectins during early stages of gestation and their differential expression in relation to tumor cells of chorionepithelioma may be relevant for the special invasive and adhesive behavior of human trophoblastic cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00500542
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