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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
    Monosomic additions in beet (Beta vulgaris) carrying extra chromosomes of B. procumbens (1988)
    Springer
    Theoretical and applied genetics 76 (1988), S. 656-664 
    Details
    ISSN: 1432-2242
    Keywords: Beta vulgaris ; Beta procumbens ; Alien monosomic additions ; Plant development in vivo ; Development in vitro
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Alien monosomic additions in beet (Beta vulgaris), each carrying one of the nine chromosomes of B. procumbens, were grown in vivo and in vitro to study the effect of the alien chromosomes on plant development. All additional chromosomes caused a reduction of the growth rate in vivo, which, in one case was so strong that some of the plants died as seedlings. In general, the morphological plant characteristics were not very useful to distinguish the addition types; this could have been the results of the wide variation in the recipient parent. However, some developmental characteristics proved to be highly chromosome-specific; for plants in vivo this was annuality, in combination with early or late flowering. If grown in vitro, chromosome specificity was observed for growth type (rosette or elongated stem), occurrence and rate of vitrification, occurrence and morphology of wound callus, formation of additional meristems on the midribs of leaves, formation of roots and a specific reaction to benzylaminopurine (BAP) the medium. Two chromosome types of B. procumbens caused resistance to the beet cyst nematode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303509
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  • 5
    Electronic Resource
    Electronic Resource
    Is motilin a cerebellar peptide in the rat? (1986)
    Springer
    Anatomy and embryology 173 (1986), S. 371-376 
    Details
    ISSN: 1432-0568
    Keywords: Motilin-like immunoreactivity ; RIA ; HPLC ; Cat ; Intestine ; Rat ; Cerebellum ; Purkinje cells ; Dendrites ; Neocortex ; Pyramidal cells ; Hippocampus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318921
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  • 6
    Electronic Resource
    Electronic Resource
    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
    Keywords: Atrial natriuretic peptide ; Pekin duck ; Salt gland ; Immunocytochemistry ; High performance liquid chromatography ; Radioimmunoassay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319589
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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
    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
    Keywords: Lipopigment bodies ; Oligodendrocytes, Schwann cells ; Cerebellum, spinal cord,N. ischiadicus ; Cat, albino mouse, Japanese waltzing mouse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687017
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Monosomic additions in beet (Beta vulgaris) carrying extra chromosomes of Beta procumbens (1988)
    Springer
    Theoretical and applied genetics 76 (1988), S. 577-586 
    Details
    ISSN: 1432-2242
    Keywords: Beta vulgaris ; Beta procumbens ; Alien monosomic additions ; Isozyme markers ; Chromosome identification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Eleven isozyme systems were used to identify the extra chromosomes, originating from Beta procumbens, in progenies of 33 monosomic additions in beet (B. vulgaris). Nine groups of monosomic additions could be distinguished, representing the nine different chromosome types of B. procumbens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00260912
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