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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Public choice 70 (1991), S. 351-360 
    ISSN: 1573-7101
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 11 (1983), S. 118-125 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Plant cell, tissue and organ culture 43 (1995), S. 229-235 
    ISSN: 1573-5044
    Keywords: Albinism ; Hordeum vulgare L. ; somaclonal variation ; totipotency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The use of the synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-d) has played an important role in the production and maintenance of totipotent cereal callus. However, 2,4-d has been implicated in the loss of totipotency from barley callus. To examine the effect of 2,4-d on barley callus, regenerability and karyotype were examined over time as influenced by cultivar differences and 2,4-d levels, during a period in which initially vigorous plant regeneration typically declines dramatically. Higher (20.4–27.1 μM) versus lower (6.8–13.6 μM) concentrations of 2,4-d were positively associated with the number of green plantlets recovered from calli maintained for 10 and 16 weeks before transfer to regeneration media, and with the longevity of regenerability. There was a positive relationship between 2,4-d concentration and normal karyotype. We also investigated the use of phenylacetic acid for the initiation of regenerable barley callus. Very poor callus growth and plant regeneration was supported by phenylacetic acid.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Psychiatric quarterly 32 (1958), S. 318-334 
    ISSN: 1573-6709
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The Second International Congress for Psychiatry, held in Zurich September 1 to 7, 1957 devoted itself to one large topic: “The Present Status of Our Knowledge About the Group of Schizophrenias.” A report of the various plenary sessions, film sessions, section meetings, and symposia is presented, under the following headings: epidemiology (incidence, cultural and familial background, etc.), definition and etiology, phenomenology and nosology, course and prognosis, and treatment. The congress accorded an opportunity for workers in various field to meet and discuss problems of common interest, to compare findings, and to appraise their differences. Such a meeting was considered to be particularly important in the field of psychiatry, where variance of viewpoint from one country to another is the rule rather than the exception. Despite the occasional handicap of language barriers, the congress was generally regarded as highly successful; and participants in the meetings found themselves richly rewarded by the panorama of progress in the field which the conference presented for their consideration.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Psychiatric quarterly 58 (1986), S. 15-23 
    ISSN: 1573-6709
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Catalysis letters 27 (1994), S. 273-280 
    ISSN: 1572-879X
    Keywords: n-butane hydrogenolysis ; W(111) ; Pt ; bimetallic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The Relationship between surface structure and reactivity is investigated by means ofn-butane hydrogenolysis, a known structure sensitive reaction, for planar and faceted Pt/ W(111) surfaces. The W(111) surface reconstructs to form pyramidal facets with [211] orientation upon vapor deposition of Pt (〉1.3 ML) and annealing above 750 K. The hydrogenolysis kinetics over the planar and the faceted surface are found to be quite different. The planar surface has a higher selectivity towards ethane formation and a higher reaction rate. The apparent activation energies are found to be 33 ± 4 kJ/mol for the planar surface and 76 ± 6 kJ/mol for a surface covered with ∼ 20 nm facets. There appears to be a correlation between the concentration of fourfold coordination (C4) sites on the surface and the amount of ethane produced. The C4 concentration is altered by changing the facet size (annealing temperature). The results indicate the presence of a different intermediate on the C4 sites as evidenced by the differences in the apparent activation energy, the reaction rate and the overall selectivity.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Interchange 14 (1983), S. 69-76 
    ISSN: 1573-1790
    Source: Springer Online Journal Archives 1860-2000
    Topics: Education
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of science teacher education 10 (1999), S. 55-67 
    ISSN: 1573-1847
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Catalysis letters 17 (1993), S. 39-46 
    ISSN: 1572-879X
    Keywords: Methane activation ; thin film nickel oxide ; Ni(100)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The activation of methane was investigated on a clean and oxidized Ni(100) surface in the pressure range of 0.05–1.0 Torr. The results are most consistent with a precursor mediated mechanism being primarily responsible for the reactive sticking of methane on the clean Ni(100) surface. This contrasts with the Ni(111) surface where dissociative adsorption has been determined to occur predominantly through the direct mechanism. The reaction probability of methane on the NiO films was significantly lower than that observed for the clean Ni(100) surface and exhibited an apparent activation energy of 8.8±1.1 kcal/mol. The results suggest that methane activation on NiO occurs on defect metallic nickel sites.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Biotechnology techniques 12 (1998), S. 521-524 
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Reverse-transcription polymerase chain reaction (RT-PCR) was used to generate a panel of distinct amplicons from total RNA derived from a variety of sources. Following amplification, semi-quantification of the different amplicons was performed by normalization to steady-state transcript levels of the house-keeping gene, glyceraldehyde 3-phosphate dehydrogenase (GAPDH), using laser densitometry, phosphorimaging, and liquid scintillation counting. In this report we demonstrate that incorporation of [α-32P] dCTP into the PCR amplicons followed by band excision from agarose gels, and counting by liquid-scintillation is both cost-effective and reproducible method for mRNA transcript semi-quantitation. © Rapid Science Ltd. 1998
    Type of Medium: Electronic Resource
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