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  • 1
    Electronic Resource
    Electronic Resource
    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
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101192
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  • 2
    Electronic Resource
    Electronic Resource
    Insect Pests of Sugar Beet (1987)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Entomology 32 (1987), S. 341-360 
    Details
    ISSN: 0066-4170
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.en.32.010187.002013
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1989.tb00371.x
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  • 4
    Electronic Resource
    Electronic Resource
    Hard coatings for optically bistable interference filters (1989)
    Springer
    Applied physics 48 (1989), S. 101-104 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Pc ; 68.55.Wy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692133
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  • 5
    Electronic Resource
    Electronic Resource
    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
    Keywords: 42.65.P
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00714635
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of optical bistability through rapid water desorption from hard coatings (1989)
    Springer
    Applied physics 48 (1989), S. 467-470 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Pc ; 68.55.Wy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694681
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  • 7
    Electronic Resource
    Electronic Resource
    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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500542
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  • 8
    Electronic Resource
    Electronic Resource
    Investigations on the thermoluminescence of LaOBr∶Tb3+ phosphors (1988)
    Springer
    Journal of thermal analysis and calorimetry 33 (1988), S. 889-894 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Thermolumineszenzmessungen gehören zu den thermoanalytischen Methoden und dienen der Untersuchung thermisch stimulierter Relaxationsvorgänge in Festkörpern, der Erlangung qualitativer Informationen über den Mechanismus der Energiespeicherung und zur Berechnung quantitativer spektroskopischer Parameter der Haftstellen. Die Thermolumineszenz von undotierten und Tb3+-aktivierten LaOBr-Materialien wurde untersucht. Die experimentellen Ergebnisse eigener Arbeiten werden zusammengestellt und einige Faktoren von Einfluss auf die Thermolumineszenz des Systems werden diskutiert.
    Abstract: Резюме Метод термолюминесц енции является одним из термосналитических методов, позволяющий изучать термически стимулир ованные релаксационные проц ессы в твердых телах и дает качественную и нформацию о механизм е накопления энергии, а также подволяет пров одит вычисления количест венных параметров спектроскопических ловушек. Изучена терм олюминесценция термолюминесценция чистого LaOBr и его образц а, активированного трехвалентным терби ем. Обобщены экспериментальные р езультаты и обсужден ы некоторые факторы, затрагивающ ие термолюминесценц ию этой системы.
    Notes: Abstract Thermoluminescence measurements are thermoanalytical techniques that allow study of the thermally stimulated relaxation processes in solids, yielding qualitative information on the mechanism of energy storage and permitting calculation of quantitative trap-spectroscopic parameters, too. The thermoluminescence of undoped and Tb3+-activated LaOBr materials was investigated. The experimental results are summarized and some factors influencing the thermoluminescence of this system are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02138605
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  • 9
    Electronic Resource
    Electronic Resource
    Winddruckuntersuchungen am Empire State Building (1934)
    Springer
    Naturwissenschaften 22 (1934), S. 728-730 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01493511
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  • 10
    Electronic Resource
    Electronic Resource
    Investigations on an interspecific hybrid involving three species of the genus Beta, with special reference to isozyme polymorphism (1986)
    Springer
    Theoretical and applied genetics 73 (1986), S. 261-266 
    Details
    ISSN: 1432-2242
    Keywords: Beta vulgaris ; Sugar beet ; Beta lomatogona ; Beta procumbens ; Interspecific hybrid ; Isozyme polymorphism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A tetraploid (2n=36) interspecific hybrid was obtained involving three species belonging to three different sections of Beta. The hybrid was highly sterile and did not show apomixis. At meiosis, up to nine bivalents were observed, most probably resulting from autosyndesis of the chromosomes of Beta lomatogona. For nine isozyme systems, individual enzyme expression was investigated in the parental species and in the hybrids. No silencing of genes or genomes was observed. In the case of some polymeric enzymes interspecific heteropolymers could be detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00289283
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