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  • Angiosperms  (77)
  • Phytochrome
  • bioavailability
  • Springer  (138)
  • American Meteorological Society
  • Springer Nature
  • 1990-1994  (106)
  • 1975-1979  (32)
  • 1955-1959
  • 1930-1934
  • 1991  (106)
  • 1977  (32)
Collection
Keywords
Publisher
  • Springer  (138)
  • American Meteorological Society
  • Springer Nature
Years
  • 1990-1994  (106)
  • 1975-1979  (32)
  • 1955-1959
  • 1930-1934
Year
  • 1
    Electronic Resource
    Electronic Resource
    Wirkung von Maillard-Produkten und Lysinoalanin auf die Bioverfügbarkeit von Eisen, Kupfer und Zink (1991)
    Springer
    European journal of nutrition 30 (1991), S. 50-55 
    Details
    ISSN: 1436-6215
    Keywords: Maillard-Produkte ; LAL ; Bioverfügbarkeit ; Eisen ; Kupfer ; Zink ; Maillard products ; LAL ; bioavailability ; iron ; copper ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary Bioavailability of iron, copper, and zinc was investigated in suckling rats. The essential trace elements were given once either with several isolated Maillard products and with LAL, respectively, or with differently heat-treated formula diets. The isolated substances revealed effects on bioavailability of all the elements tested, either on the preresorptive or on the postresorptive level. The formula diets affected only the bioavailability of copper — even when fed for several weeks.
    Notes: Zusammenfassung Es wurde die Bioverfügbarkeit von Eisen, Kupfer und Zink untersucht, wenn diese essentiellen Spurenelemente 1. mit einigen isolierten Maillard-Produkten bzw. LAL, oder 2. mit thermisch unterschiedlich belasteten Testnahrungen einmalig an Säuglingsratten verabreicht wurden. Durch die isolierten Testsubstanzen ließen sich bei allen drei Elementen Effekte auf der präresorptiven und/oder postresorptiven Ebene erzielen. Die Testnahrungen beeinflußten — auch wenn sie fünf Wochen lang verfüttert wurden — nur die Bioverfügbarkeit des Kupfers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01910732
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  • 2
    Electronic Resource
    Electronic Resource
    Angiosperm origin and early stages of seed plant evolution deduced from rRNA sequence comparisons (1991)
    Springer
    Journal of molecular evolution 32 (1991), S. 253-261 
    Details
    ISSN: 1432-1432
    Keywords: Chloroplast 4.5S rRNA ; Cytosolic and chloroplast 5S rRNAs ; 5.8S rRNA ; 18S rRNA ; Nucleotide sequences ; Phylogenetic trees ; Angiosperms ; Gymnosperms ; Monocotyledons ; Dicotyledons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Complete or partial nucleotide sequences of five different rRNA species, coded by nuclear (18S, 5.8S, and 5S) or chloroplast genomes (5S, 4.5S) from a number of seed plants were determined. Based on the sequence data, the phylogenetic dendrograms were built by two methods, maximum parsimony and compatibility. The topologies of the trees for different rRNA species are not fully congruent, but they share some common features. It may be concluded that both gymnosperms and angiosperms are monophyletic groups. The data obtained suggest that the divergence of all the main groups of extant gymnosperms occurred after the branching off of the angiosperm lineage. As the time of divergence of at least some of these gymnosperm taxa is traceable back to the early Carboniferous, it may be concluded that the genealogical splitting of gymnosperm and angiosperm lineages occurred before this event, at least 360 million years ago, i.e., much earlier than the first angiosperm fossils were dated. Ancestral forms of angiosperms ought to be searched for among Progymnospermopsida. Genealogical relationships among gymnosperm taxa cannot be deduced unambiguously on the basis of rRNA data. The only inference may be that the taxon Gnetopsida is an artificial one, andGnetum andEphedra belong to quite different lineages of gymnosperms. As to the phylogenetic position of the two Angiospermae classes, extant monocotyledons seem to be a paraphyletic group located near the root of the angiosperm branch; it emerged at the earliest stages of angiosperm evolution. We may conclude that either monocotyledonous characters arose independently more than once in different groups of ancient Magnoliales or that monocotyledonous forms rather than dicotyledonous Magnoliales were the earliest angiosperms. Judging by the rRNA trees, Magnoliales are the most ancient group among dicotyledons. The most ancient lineage among monocotyledons leads to modern Liliaceae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02342748
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  • 3
    Electronic Resource
    Electronic Resource
    Phytochrome and phosphotungstate-chromate-positive vesicles from Cucurbita pepo L. (1977)
    Springer
    Planta 133 (1977), S. 169-177 
    Details
    ISSN: 1432-2048
    Keywords: Cell fractionation ; Cucurbita ; Histochemical staining ; Phosphotungstate-chromate staining ; Phytochrome ; Plasma membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phosphotungstic acid-chromic acid (PTA-CrO3) stain, putatively specific for the plasma membrane of plants, has been used in an attempt to monitor the distribution of this membrane in a 20,000 x g particulate fraction from Cucurbita hypocotyl hooks. On discontinuous sucrose gradients, the relative distributions of the phytochrome and PTA-CrO3-positive vesicles present in this fraction appear to be correlated. When intact tissue is stained, however, other components, in addition to the plasma membrane, react positively to the stain. These components include prolamellar-body membranes, lipid droplets, and ribosomes. This lack of specificity calls into question the reliability of the technique for the unequivocal identification and accurate quantitation of plasma-membrane fragments in isolated particulate fractions. The present data do not, therefore, provide unambiguous evidence that phytochrome is associated with plasma membrane in tissue homogenates from Cucurbita.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391916
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of chlorophyll content on phytochrome measurements in turnip cotyledons (1977)
    Springer
    Planta 134 (1977), S. 11-16 
    Details
    ISSN: 1432-2048
    Keywords: Brassica ; Chlorophyll ; Cotyledons ; Phytochrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phytochrome determinations at 730/800 nm were performed on de-etiolated turnip (Brassica rapa L.) cotyledons in which chlorophyll (Chl) content had been reduced experimentally to varying degrees by pre-treatment with high temperature (HT), or transfer to 3% ethanol. The magnitude of detectable phytochrome depended on Chl content, showing a linear relationshop in vivo. The results were confirmed by an in vitro experiment where, however, the correlation was exponential. An attempt is made to illustrate phytochrome decay in continuous blue or red light after corretion for Chl interference. To overcome the possible objection that the higher Δ(ΔA) measured in continuous light after HT pre-treatment could be caused by a reduced rate of destruction, apparent re-synthesis following red light was measured after several hours of darkness during which time the HT effect was lost. Under these conditions HT pre-treated samples display a more realistic magnitude of apparent new synthesis and make correlation with a physiological response possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390087
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  • 5
    Electronic Resource
    Electronic Resource
    Radiation-induced appearance of phytochrome in soybean cell suspensions (1977)
    Springer
    Planta 134 (1977), S. 57-59 
    Details
    ISSN: 1432-2048
    Keywords: Cell culture ; Clycine ; Phytochrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract No phytochrome can be detected spectrophotometrically in soybean (Glycine max (L.) Merr. cv. Mandarin) cell suspensions grown in darkness. White light from a tungsten filament lamp and a band of far-red light have been found to induce the appearance of phytochrome in them. Red light failed to bring about phytochrome increase and destroyed the phytochrome induced by far-red light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390095
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  • 6
    Electronic Resource
    Electronic Resource
    Chlorophyll interference with phytochrome measurement (1977)
    Springer
    Planta 135 (1977), S. 119-123 
    Details
    ISSN: 1432-2048
    Keywords: Chlorophyll ; Phytochrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Measurements of phytochrome by Δ (ΔA725–815 nm) were completely suppressed at chlorophyll concentrations of the order of 20–40 μg g-1 f.wt. in vivo and 37 μg cm-3 in vitro, and the readings were reduced by 50% at only 12 μg cm-3 in vitro. At these concentrations of chlorophyll in aqueous methanol, the loss of phytochrome signal in vitro appeared to be due to failure of phytochrome photoconversion rather than to interference with ΔA measuremebt by chlorophyll fluorescence in the 125/815 nm measuring beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387159
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  • 7
    Electronic Resource
    Electronic Resource
    Photoreception and photoresponses in the radish hypocotyl (1977)
    Springer
    Planta 136 (1977), S. 125-129 
    Details
    ISSN: 1432-2048
    Keywords: Blue-light-response ; Elongation ; High-irradiance-response ; Photomorphogenesis ; Phytochrome ; Raphanus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In etiolated hypocotyls of Raphanus sativus L. the growth responses to continuous red, far-red and blue light have been distinguished on the bases of photoreceptive sites and regions of physiological response. Blue light appeared to retard a fairly mature stage of elongation, acting immediately and directly on the cells irradiated. Far-red light caused a marked inhibition of all stages of elongation after a lag period, and the stimulus could be transmitted from the hook region. The effect of red light was complex and consisted of one promotive and two inhibitory responses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396187
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  • 8
    Electronic Resource
    Electronic Resource
    Action spectra for the inhibition of growth in radish hypocotyls (1977)
    Springer
    Planta 136 (1977), S. 131-134 
    Details
    ISSN: 1432-2048
    Keywords: Action-spectrum ; Blue-light photoreceptor ; High-irradiance-response ; Photomor-phogenesis ; Phytochrome ; Raphanus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In etiolated seedlings of Raphanus sativus L. the inhibition of hypocotyl elongation by continuous light showed a major bimodal peak of action in the red and far-red, and two minor peaks in the blue regions of the spectrum. It is argued that, under conditions of prolonged irradiation, phytochrome is the pigment controlling the inhibition of hypocotyl elongation by red and far-red light, but that its mode of action in far-red is different from that in red. A distinct pigment is postulated for blue light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396188
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  • 9
    Electronic Resource
    Electronic Resource
    Regulation of enzyme levels by phytochrome in mustard cotyledons: Multiple mechanisms? (1977)
    Springer
    Planta 136 (1977), S. 181-186 
    Details
    ISSN: 1432-2048
    Keywords: Enzyme Regulation ; Sinapis alba ; Phytochrome ; Phenylalanine ammonia-lyase ; Ribulosebisphosphate carboxylase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phytochrome controls the appearance of many enzymes in the mustard (Sinapis alba L.) cotyledons. The problem has been whether the effect of phytochrome on the appearance of enzymes in this organ is due to a common initial action of Pfr, e.g. due to the liberation of a “second messenger”. We have compared the modulation by light (phytochrome) of the appearance of phenylalanine ammonia lyase (PAL)+ and ribulosebisphosphate carboxylase (Carboxylase)+. PAL becomes detectable in the mustard cotyledons at 27 h after sowing while Carboxylase starts to appear only at 42 h after sowing (starting points, 25° C). The starting points cannot be shifted by light. As a major result, in the case of PAL the inductive effect of continuous red light (given from the time of sowing) remains fully reversible by 756 nm-light up to the starting point (27 h after sowing) while with Carboxylase full reversibility in continuous red light is lost at approximately 15 h after sowing. While the induction of Carboxylase is already saturated at a very low level of Pfr (e.g. continuous 756 nm-light saturates the response) and does not depend on irradiance (e.g. continuous 675 mW m-2 red light and 67.5 mW m-2 red light lead to the same time course), PAL induction is a graded response over a wide range of Pfr doses and depends strongly on the fluence rate (high irradiance response, HIR). It is concluded that PAL induction and Carboxylase induction are not only separated in time but differ in every regard except that both responses are mediated by phytochrome. The present data support the previous conclusion that the specification of the temporal and spatial pattern of development is independent of phytochrome even though the realization of the pattern of development can only occur in the presence of phytochrome (Pfr). It seems that there is no feedback from pattern realization to pattern specification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396196
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  • 10
    Electronic Resource
    Electronic Resource
    Phytochrome and potassium uptake by mung bean hypocotyl sections (1977)
    Springer
    Planta 137 (1977), S. 61-64 
    Details
    ISSN: 1432-2048
    Keywords: Phaseolus ; Phytochrome ; Potassium uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Uptake of potassium (K) and 86rubidiumlabelled potassium (86Rb) by sub-hypocotyl hook sections of Phaseolus aureus L. was inhibited by red light. The effect was reversible with far red light. Using short exposures of high irradiance the effect on 86Rb-labelled K uptake was observed after 5 min. The response showed no specificity for a particular anion. Uptake of 86Rb-labelled K by sections cut immediately below the cotyledons was enhanced by red light after 10 min incubation and was also far red reversible. These results are interpreted as a rapid phytochrome-induced change in membrane properties resulting in modified K uptake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394436
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