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  • 1
    Electronic Resource
    Electronic Resource
    Maternal vitamin A restriction alters biochemical development of the brain in rats (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 208-211 
    Details
    ISSN: 1420-9071
    Keywords: Brain development ; DNA ; RNA ; protein ; vitamin A ; rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The biochemical development of the fetal brain in relation to maternal vitamin A restriction was studied in rats. The vitamin A status of pregnant rats was varied by supplying low, medium and adequate amounts (6, 40, and 100 μg retinol/day/kg body weight, respectively) of vitamin A during pregnancy and suckling. The maternal vitamin A restriction caused an altered brain development in terms of tissue weight, DNA, RNA and protein levels, and biosynthesis of DNA and protein from [3H]-thymidine and [3H]-leucine, respectively. A dose-dependent effect of maternal vitamin A restriction on the metabolism of DNA, RNA and protein was noticed in the developing fetal brain of rats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02027317
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Crossability and embryo rescue enhancement in wide crosses between wheat and three Agropyron species (1990)
    Springer
    Euphytica 49 (1990), S. 209-214 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; Agropyron spp. ; embryo rescue ; wide crosses ; crossability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Soft winter wheat lines were crossed with Agropyron intermedium, A. elongatum and A. trichophorum using pollen from single plants of Agropyron spp. to pollinate wheat spikes. Not only species but also individual plants within varieties of Agropyron species differed in percent seed set with a wheat genotype. In two arrays of crosses between two phenotypically different plants of A. elongatum and nine wheat lines, one Agropyron plant gave higher seed set (overall=27.1%) than the other (overall=3.7%). The differences were significant in seven of the nine cross combinations. Results are consistent with the hypothesis that these two plants differ in their crossability as pollen parents with wheat, and suggest the possibility of occurrence of crossability genes in wheatgrasses. The success rate of hybrid embryo rescue was higher (87.5%) with cold treatment (4°C) than without cold treatment (75.0%) of excised embryos on culture media. Results underscore the significance of genotype of the alien species for crossing with low crossable wheats, and of the physical factors for improving embryo rescue in wide crosses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00036290
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  • 3
    Electronic Resource
    Electronic Resource
    How wide can a wide cross be? (1995)
    Springer
    Euphytica 82 (1995), S. 43-64 
    Details
    ISSN: 1573-5060
    Keywords: wide cross ; wide hybridization ; interspecific cross ; Triticeae ; Agropyron complex ; wheatgrasses ; Triticum ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Wide crosses in wheat are reviewed in relation to various factors that facilitate wide crossing to show that wide crosses can be as wide as one can make them. Included in this review is a particular reference to wheat-wheatgrass (Agropyron complex) crosses and an update on wide crosses of wheat with various genera of Agropyron complex. Hybrid seed set is too variable to predict whether a wide hybrid, where no seed was obtained in one attempt, will not be possible. High crossability genes seem to facilitate not only fertilization but also seed development, enabling embryo rescue. Variability for crossability occurs not only in wheat but also in alien species. Contrary to conventional thinking, several wide hybrids with wheat can be produced when species with lower chromosome numbers are used as female parents. Pre-and post-fertilization barriers to wide crosses do not appear to be equally strong, and can be overcome by the development and application of various technologies. Considering these aspects of wide hybridization, and based on recent successes in producing previously unsuccessful and very wide hybrids, it is concluded that how wide cross between plant species can be made is an open question and that many new and wider hybrids can be produced in future.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028709
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  • 4
    Electronic Resource
    Electronic Resource
    Wheat anther culture: effect of genotype and environmental conditions (1991)
    Springer
    Plant cell, tissue and organ culture 24 (1991), S. 233-236 
    Details
    ISSN: 1573-5044
    Keywords: anther culture ; cultivars ; Triticum aestivum ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Twenty-two cultivars and lines of winter and spring wheat (Triticum aestivum L.) were studied, most for the first time, for their anther culture response. The response was genotype dependent. Plants grown in the field gave higher callus induction frequency than those grown in the greenhouse and the controlled environment chamber. Donor plants grown in a season of low drought stress as compared to a season of severe drought stress resulted in a higher frequency of callus induction. Spherical microcalli were observed in two wheat genotypes in some of only those anthers that were placed with only one loculus in contact with the medium. Wheat lines that were more responsive to anther culture were identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033482
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  • 5
    Electronic Resource
    Electronic Resource
    Biochemical development of the rat lung: Studies on cellular DNA, RNA and protein content in relation to maternal vitamin A status (1987)
    Springer
    European journal of nutrition 26 (1987), S. 116-124 
    Details
    ISSN: 1436-6215
    Keywords: lung ; development ; vitamin A ; DNA ; RNA ; protein ; rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Der Einfluß einer Beschränkung der Vitamin-A-Zufuhr für das Muttertier auf die biochemische Entwicklung der Lunge des Jungtieres wurde bei Ratten untersucht. Der Vitamin-A-Status der Muttertiere wurde durch niedrige, mittlere und adäquate Gaben von Vitamin A während Trächtigkeit und Säugezeit variiert (6, 40 und 100 μg Retinol/Tag/kg Körpergewicht). Die Ergebnisse zeigen, daß die Beschränkung der Vitamin-A-Zufuhr für das Muttertier das Wachstum und die Entwicklung der Lunge in bezug auf Gewicht, DNA- und Proteingehalt und -biosynthese aus markierten Vorstufen, RNA-Gehalt, Zellgröße und Zellzahl beeinflussen.
    Notes: Summary The effect of maternal vitamin A restriction on the biochemical development of the lung in rats has been studied. The vitamin A status of dams has been varied by supplying low, medium and adequate amounts of vitamin A (6, 40 and 100 μg retinol/day/kg body weight, respectively) during pregnancy and suckling. The results demonstrate that the restricted supply of vitamin A to the mother affected the growth and development of the lung in parameters of tissue weight, DNA and protein levels and their biosynthesis from respective labelled precursors, RNA contents, cell number and cell size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02019607
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Secretion pattern of retinol-binding protein in blood of goats: Effect of vitamin A, provitamin A and their dosing schedule (1989)
    Springer
    European journal of nutrition 28 (1989), S. 225-230 
    Details
    ISSN: 1436-6215
    Keywords: RBP secretion ; vitamin A ; carotenoids ; goat ; RBP-Sekretion ; Vitamin A ; Carotinoide ; Ziege
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Die Sekretion von retinolbindendem Protein (RBP) ins Blut von Ziegen wurde nach unterschiedlicher Verabreichung von Vitamin A (Retinylacetat), Β-Carotin und einer Mischung von pflanzlichen Carotinoiden untersucht. Die Zufuhr dieser Verbindungen — entweder in einer einzelnen hohen Dosis oder in der gleichen Menge gleichmäßig auf 4 Tagesdosen verteilt — führte zu einem deutlichen Anstieg der RBP-Sekretion. Diese Sekretion erfolgte in zwei Phasen, von denen eine früh und eine später einsetzte.
    Notes: Summary Studies were conducted on the secretion of retinol-binding protein (RBP) in blood of goats given different treatments of preformed vitamin A, Β-carotene and plant carotenoids. Administration of these sources either in a single massive dose or massive dose split into four equal doses, markedly increased the secretion of RBP in blood. The secretion of RBP in blood occurred at least in two phases, one at early periods and the other at later periods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02023692
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    Paper (German National Licenses)
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