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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of growth during geotropic curvature in seedling hypocotyls (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 6 (1983), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. The patterns of growth in organs curving under the influence of gravity were analysed by time-lapse photography of cress and cucumber hypocotyls which were delimited into 1 mm zones by ion-exchange beads. Geotropic curvature resulted from changes in growth rate on both sides of the organ. Growth inhibition of varying degrees of intensity occurred in all the previously growing zones of the upper (concave) side. An absolute reduction in length due to compression frequently occurred in some zones. Also, in both species growth stimulation was observed on the lower (convex) side. The disparity in growth rate between the upper and lower surfaces varied with time, being more apparent in the subapical region in the first hour of curvature. A later promotion of growth rate on the lower surface subsequently increased the curvature of the more basal zones. Autotropic straightening occurred as a consequence of growth changes, both inhibitory and stimulatory, in the apical zones. These events indicate a polarity of response in which apical zones have precedence over basal zones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1983.tb01273.x
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of growth during light-induced hook opening in cress (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 5 (1982), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Growth in various regions of the hypocotyls of dark-grown cress seedlings before and after exposure lo continuous white light has been analysed by time-lapse photography. In the dark, growth in the hook was minimal, the upward growth of the seedling being sustained by extension of the shank, especially the uppermost zones. Following irradiation, the hook and the remainder of the hypocotyl showed dissimilar growth responses. Previously growing regions of the shank were inhibited while zones within the hook, especially the apical end of the inner (concave) side, showed marked growth stimulation. These changes in growth rates commenced within 1 h from exposure to the light stimulus and thus considerably preceded any observable changes in hook angle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1982.tb00934.x
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  • 3
    Electronic Resource
    Electronic Resource
    Regional growth patterns in the hypocotyls of etiolated and green cress seedlings in light and darkness (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 5 (1982), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. A system is described whereby seedling development can be analysed in terms of growth rates of specific 1 mm regions of the hypocotyl. The technique involves time-lapse photography of marked hypocotyls in a specially designed chamber which accommodates seedlings in various orientations with respect to gravity, and under irradiation regimes differing in light quality, quantity and direction. The results of a preliminary study of the upward growth of etiolated or green cress seedlings in darkness or overhead while light are reported. Highest growth rates in etiolated seedlings were observed in zones in the upper one-third of ihe hypocotyl. In green seedlings, growth was more prominent within the subapical zones. Light further restricted growth of the median and basal zones in both types of seedling. However, in their immediate responses to the onset of irradiation, green and etiolated seedlings differed markedly. In etiolated seedlings, recovery of growth at the apex was accompanied by the development of inhibition in the median-basal regions; green seedlings showed a transient inhibition of growth in the apical zone together with a strong immediate inhibition in the median-basal regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1982.tb00933.x
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis of growth during phototropic curvature of cress hypocotyls (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 5 (1982), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Growth rates throughout an organ curving phototropically under continuous, unilateral while light were monitored by lime-lapse photography of cress hypocotyls marked into 1 mm sections by two rows of ion-exchange beads. Curvature resulted from an integrated sequence of changes in growth rate on each side of the organ, but the actual patterns of change and, therefore rales of curvature, differed within even this one species, depending upon the immediate pretreatment of the seedlings. Transference of seedlings from darkness to unilateral irradiation gave immediate growth inhibition on both sides of the organ. Curvature resulted from differential recovery of growth rate, being seen first on the shaded side, most prominently in the apical regions; only 2h after initial exposure to light did growth recover on the lit (lower) side. On the other hand, transfer of seedlings from omnilateral to unilateral irradiation of the same intensity resulted in simultaneous growth inhibition on the irradiated side and stimulated growth on the shaded side: this growth stimulation of the shaded side was greater than occurred in totally darkened control plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1982.tb00935.x
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  • 5
    Electronic Resource
    Electronic Resource
    Photoregulation of hypocotyl growth: geotropic evidence for the operation of two photosystems (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 3 (1980), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. The rate of curvature of etiolated cress (Lepi-dium sativum L.) hypocotyls in response to gravity (negative geotropism) was retarded by red or blue light; far-red irradiation was without effect. The timing of the irradiation period in relation to the presentation for geostimulus markedly affected the response. When seedlings were irradiated during the 1–2 h period of geostimulus, blue light was more effective than red at retarding curvature; when seedlings were irradiated prior to geostimulus, only red light affected geocurvature. These results are interpreted as a further example of the kinetically distinct effects of red and blue light on hypocotyl development. Blue light elicited a rapid, immediate response effective only during the period of irradiation; red light induced a response characterized by a lag period and persistence in subsequent darkness. Etiolated mustard seedlings showed similar responses to light and gravity. The results are discussed in relation to the possibility that two photosystems operate in hypocotyl growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11581492
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  • 6
    Electronic Resource
    Electronic Resource
    Phototropism and geotropism in hypocotyls of cress (Lepidium sativum L.) (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 4 (1981), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. The phototropic and the geotropic sensitivities of cress hypocotyls differed in etiolated and in green seedlings. In etiolated seedlings, phototropism was poorly developed and geotropism seemed to be the dominant orientation mechanism. In green seedlings, although geotropic sensitivity was slightly greater, phototropic responses were markedly enhanced, such that photo-signals could over-ride, or even reverse, geocurvature. The ‘de-etiolation’ light pretreatments required to bring about these changes in the photo-and geo-systems were different. The slight enhancement of geocurvature could be achieved by short-term exposure to red light and was reversed by far-red irradiation. The marked stimulation of photocurvature required extensive irradiation pretreatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11610972
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  • 7
    Electronic Resource
    Electronic Resource
    Microbial diversity in sediments associated with surface-breaching gas hydrate mounds in the Gulf of Mexico (2003)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 46 (2003), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A molecular phylogenetic approach was used to characterize the composition of microbial communities from two gas hydrate sedimentary systems in the Gulf of Mexico. Nucleic acids, extracted from sediments directly overlying surface-breaching gas hydrate mounds collected from a research submersible (water depth 550–575 m), were amplified with nine different 16S rDNA gene primer sets. The polymerase chain reaction primers targeted microorganisms at the domain-specific (Bacteria and Archaea) and group-specific (sulfate-reducing bacteria (SRB) and putative anaerobic methane-oxidizing (ANME) archaea) level. Amplicons were obtained with five of the nine primer sets including two of the six SRB Groups (SRB Group 5 and Group 6) and used to generate five different clone libraries. Analysis of 126 clones from the Archaea library revealed that the sediments associated with naturally occurring gas hydrate harbored a low diversity. Sequence analysis indicated the majority of archaeal clones were most closely related to Methanosarcinales, Methanomicrobiales and distinct phylogenetic lineages within the ANME groups. The most frequently recovered phylotypes in the ANME library were related to either ANME-2 or Methanomicrobiales. In contrast to the two archaeal libraries, bacterial diversity was higher with the majority of the 126 bacterial clones most closely related to uncultured clones dominated by the δ- and ε-Proteobacteria. Interestingly, while 82% of the clones in the SRB Group 5 library were affiliated with δ-Proteobacteria, the vast majority (83%) of clones in the SRB Group 6 library was affiliated with the Firmicutes. This is the first phylogenetic-based description of microbial communities extant in methane-rich hydrate-associated sediments from a hydrocarbon seep region in the Gulf of Mexico.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0168-6496(03)00191-0
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  • 8
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    On the utility of radium isotopes as tracers of hydrocarbon discharge (2013)
    Elsevier
    Details
    Publication Date: 2013-10-01
    Print ISSN: 0304-4203
    Electronic ISSN: 1872-7581
    Topics: Geosciences
    Published by Elsevier
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  • 9
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    Fine-scale distribution of methanotrophic mussels at a Louisiana cold seep (1990)
    Elsevier
    Details
    Publication Date: 1990-01-01
    Print ISSN: 0079-6611
    Electronic ISSN: 1873-4472
    Topics: Geosciences , Physics
    Published by Elsevier
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  • 10
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    Hindcast modeling of oil slick persistence from natural seeps (2017)
    Elsevier
    Details
    Publication Date: 2017-02-01
    Print ISSN: 0034-4257
    Electronic ISSN: 1879-0704
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Elsevier
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