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  • 1
    Publication Date: 1999-03-26
    Print ISSN: 0016-7835
    Electronic ISSN: 1432-1149
    Topics: Geosciences
    Published by Springer
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 15 (1975), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Es wurden die Monosaccharid-, Disaccharid- und Stärke gehalte in Wurzeln und Spross von Rumex obtusifotius in Abhängigkeit vom Entwicklungsstadium untersucht. Es zeigte sich, dass der Reservestoffwechsel von Rumex obtusifolius durch drei Phasen gekennzeichnet ist. (1) Phase: Die Pflanze treibt nach dem Winter oder nach einem Schnitt aus. In dieser Zeit nimmt der Stärkegehalt in den Wurzeln ab. Es findet keine Einlagerung statt. (2) Phase: Ab etwa 30 em Wuchshöhe der blütentragenden Sprosse beginnt die Einlagerungsphase. Es erfolgi ein sprunghafter Ansiieg der Starkegehalte in den Wurzeln. Die Einlagerungsphase endet ausgangs der Blute mit dem Abschluss der Sprosstreckung. (3) Phase: Die Samen reifen ab, die blütentragenden Sprosse vertrocknen. Der Stärkegehalt der Wurzeln verändert sich nur noch geringfägig.Diese Befunde deuten darauf hin, dass die grösste Menge an Herbiziden vom Typ der Phenoxyverbindungen kurz vor und während der Blüte in die Speicherorgane von R. obtusifolius transportiert werden dürften. Storage metabolism in broad-leaved dock (Rumex obtusifolius)The amounts of monosaccharide, disaccharide and starch present in roots and shoots of Rumex obtusifotlius were investigated together with their relationship to the stage of development of the plant. It was found that storage metabolism of R. obtusifolius is characterized by three phases. Phase 1: the emergence of shoots after the winter or after cutting. During this period the starch content of the roots decreases and no storage lakes place. Phase 2: When the flower-bearing shoots are about 30 cm long. The storage phase now begins and an abrupt increase in the starch content of the roots occurs. The storage phase ends with the opening of the flower after the completion of shoot elongation. Phase 3. The seeds ripen and the flower-bearing shoots wither. Changes in the starch content of the roots are insignificant.These findings indicate that the majority of the phenoxy-type herbicides might well be translocated into the storage organs of R. obtusifolius shortly before and during flowering.Métabolisme des reserves chez la patience sauvage (Rumex obtusifolius)Les teneurs en monosaccharide, en disaccharide et en amidon présentes dans les racines et les pousses de Rumex obtusifolius ont étéévaluées en même temps que leur relation avec le stade de developpement de la plante. Il a été constaté que le métabolisme des réserves chez R. obtusifolius est caractérisé par trois phases: Phase 1: sortie des pousses aprés l'hiver ou après une coupe. Durant cette période, la teneur en amidon des racines décroít et il n'y a pas dc mise en réserve. Phase 2: lorsque les hampes florales ont environ 30 cm de long. La phase de mise en réserve commence alors et un brusque accroissement de la teneur en amidon se produit. La période de mise en réserve se termine avec l'ouverture de la fleur, aprés l'élongation complète de la tige. Phase 3: les semences mûrissent et les hampes florales se fanent. Les changements de teneur en amidon des racines sont insignifiants.Ces résultats montrent que la majorité: des herbicides de la série phénoxy peuvent aisément migrer dans les organes de stockage de R. obtusifolius peu de temps avant la floraison et pendant celle-ci.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0016-7835
    Keywords: Key words Sediment-hosted deposits ; Magnesite ; Siderite ; Bashkir mega-anticline ; Riphean ; Metasomatism ; Geochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract In the Bashkir mega-anticline (western Urals) stratabound magnesite, siderite, fluorite and base-metal deposits are hosted by a sequence of Riphean sediments with a thickness of more than 12 km. The giant deposits of siderite (Bakal) and sparry magnesite (Satka) belong to the largest known mineral deposits of this type on Earth but are still disputed with respect to their origin. Both the Fe- and Mg-carbonate ores are clearly characterized by mimetic preservation of sedimentary and diagenetic textures of the host carbonate sediments, giving evidence of epigenetic metasomatic replacement. In the stratiform magnesite deposits of Satka, O- and C-isotopes, REE pattern and the lithostratigraphic position of the ore, point to the reflux of early diagenetic Mg-rich brines being responsible for the selective replacement of brecciated dolomite. The Bakal siderite deposits are hosted by Lower Riphean carbonate rocks and are controlled by a Lower to Middle Riphean unconformity marked by deep erosion and subsequent transgression-related sedimentation of coarse clastics. Their independence of carbonate lithofacies and their trace element distribution are indicative of metasomatic processes. Fe-bearing fluids have probably been generated by low-grade metamorphic (catagenetic) devolatization from underlying argillites, causing the metasomatic formation of large siderite ore bodies in the Bakal carbonates due to the focusing of the fluid flow by the overlying Mid-Riphean coarse clastics.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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  • 5
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    In:  CLEAN. CO2 Large-Scale Enhanced Gas Recovery in the Altmark Natural Gas Field | Geotechnologien science report ; 19 ; Advanced Technologies in Earth Sciences
    Publication Date: 2020-02-12
    Description: CLEAN was a scientific programme in support of a pilot Enhanced Gas Recovery (EGR) project and it was planned to inject nearly 100,000 t of carbon dioxide (CO2) into the Altmark natural gas field. Due to delays in the permitting process, injection did not occur within the time frame of the project. Therefore a test case was studied of the theoretical injection of CO2. Modelling CO2 injection in the Altensalzwedel segment of the Altmark depleted gas field shows that effective injection can be carried out at a tubing head pressure as low as 3.5 MPa and at tubing head temperature of 10 °C. The history matching of the simulation model and the injection prediction were successfully conducted with a volume ratio of injected CO2 to the gas in place of approximately 0.06 which did not show any enhancement in the gas recovery (no EGR effect). Within the pilot project period of 2 years there would be no CO2 arrival at the production well located at about 1,600 m from the injector. Penetration of the CO2 into the reservoir was maximum approximately 800 m and minimum around 250 m depending on the permeability of the formation layer. The gas mixing zone reaches the observation well which is located at about 660 m from the injector already before 1 year of injection. Under the simulated conditions direct monitoring of the CO2 front with active seismic measurements will not be feasible as the reservoir layers are too thin and the effects of CO2 gas replacing reservoir gas are too small. Seismic monitoring has to concentrate on the detection of possible leakages in shallower aquifers where larger velocity and density changes would occur.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/bookPart
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