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  • Other Sources  (79)
  • Springer  (46)
  • Elsevier  (33)
  • Annual Reviews
  • 1980-1984  (79)
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  • 1
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    Springer
    In:  Berlin, Springer, vol. V/1, subvol. a, pp. 559-932, (ISBN 0-935702-96-2)
    Publication Date: 1982
    Keywords: Rock mechanics ; Physical properties of rocks ; Handbook of geophysics ; Laboratory measurements ; density ; porosity ; elasticity ; electrical ; magnetic ; properties ; radioactivity ; moon ; ice ; Czermak ; Huckenholz ; Rybach ; Schmid ; Schopper ; Schuch ; Stoeffler ; Wohlenberg
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  • 2
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 14 B, pp. 225, (ISBN 3-7643-7011-4)
    Publication Date: 1984
    Keywords: Applied geophysics ; seismic Migration ; Seismics (controlled source seismology) ; Acoustics
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  • 3
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    Springer
    In:  Berlin, Springer, vol. III/12, Supplement to III/4, no. XVI:, pp. 1-14, (ISBN 0-87590-299-5 (soft cover))
    Publication Date: 1982
    Keywords: Handbook of geophysics ; Handbook of physics ; Handbook of mineralogy
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  • 4
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    Elsevier
    In:  Amsterdam, Elsevier, vol. Developments in Petroleum Science vol. 15A, no. Publ. No. 12, pp. 9, (ISBN: 0-12-636380-3)
    Publication Date: 1984
    Keywords: Borehole geophys. ; Textbook of geophysics ; GFZ ; RUB ; GMG ; 3.45.8 ; UniL ; IfGuG ; in ; Französisch
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  • 5
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    Elsevier
    In:  Amsterdam, 253 pp., Elsevier, vol. 10, no. 1, pp. 1-40, (ISBN: 3-540-23712-7)
    Publication Date: 1983
    Keywords: Textbook of geophysics ; Acoustics ; Seismics (controlled source seismology) ; Waves ; Wave propagation
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  • 6
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    Springer
    In:  New York, 1108 pp., Springer, vol. 96, pp. 225, (ISBN 0-471-95596-5)
    Publication Date: 1981
    Keywords: FROTH ; RUB ; GMG ; 3.15.80 ; Textbook of geophysics ; Seismology ; Waves ; Wavelet processing ; SModelling ; Dislocation ; Elasticity theory of dislocations ; Source
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  • 7
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    Springer
    In:  Heidelberg, Springer, vol. V/2, no. Subvol. a, pp. 220, (ISBN: 0-08-037951-6)
    Publication Date: 1984
    Keywords: Review article ; Seismology ; (The Earth's free) oscillations ; Waves ; Gravimetry, Gravitation ; Geomagnetics ; Planetology ; solar ; system ; Anderson ; Brosche ; Busse ; Dziewonski ; Groten ; von ; Herzen ; Jackson ; Janle ; Kahle ; Maelzer ; Meissner ; Mueller ; Prodehl ; Rybach ; Schneider ; Suendermann ; Waenke ; Wilhelm ; Zuern
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  • 8
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 81A and 81B, no. 22, pp. 65-70, (1405101733, 336 p.)
    Publication Date: 1984
    Keywords: Textbook of geophysics ; Earth model, also for more shallow analyses !
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  • 9
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    Springer
    In:  Berlin, Springer, vol. 6, no. 1, pp. 1-40, (ISBN: 0-444-51340-X)
    Publication Date: 1984
    Keywords: Textbook of mathematics ; lineare ; Algebra ; Inversion ; Eigen-value ; MINV ; Zurmuhl
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  • 10
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    Elsevier
    In:  Bull., Polar Proj. OP-O3A4, Signal Processing II: Theories and Applications, Bath, Elsevier, vol. 186, no. XVI:, pp. 689-692, (ISBN: 3-540-23712-7)
    Publication Date: 1983
    Keywords: Seismology ; Seismic arrays ; Spectrum ; Broad-band ; Data analysis / ~ processing ; f-k-Analysis ; Schuessler ; Schussler
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  • 11
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    Elsevier
    In:  Bull., Polar Proj. OP-O3A4, Signal Processing II: Theories and Applications, Leiden, Elsevier, vol. 11, no. XVI:, pp. 673-680, (ISBN: 3-540-23712-7)
    Publication Date: 1983
    Keywords: Seismology ; Seismics (controlled source seismology) ; Filter- ; Data analysis / ~ processing ; Schuessler ; Schussler
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  • 12
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    Elsevier
    In:  Bull., Polar Proj. OP-O3A4, Computer-aided Seismic Analysis and Discrimination, London, Elsevier, vol. 16, no. 4, pp. 97-109, (ISBN 0080419208)
    Publication Date: 1981
    Keywords: Group veloc. ; Velocity analysis
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  • 13
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    Springer
    In:  Bull., Polar Proj. OP-O3A4, Physical Properties of Rocks, Heidelberg, Springer, vol. V/2, no. Subvol. a, pp. 61-83, (ISBN 0080419208)
    Publication Date: 1984
    Keywords: Review article ; Seismology ; (The Earth's free) oscillations ; Waves ; Muller ; Zuern ; Zurn
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  • 14
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    Springer
    In:  Bull., Open-File Rept., Zahlenwerte und Funktionen aus Naturwiss. und Technik, L.B. V-1b, Berlin, Springer, vol. 81A, no. 16, pp. 141-238, (ISBN 0080419208)
    Publication Date: 1982
    Keywords: Textbook of geophysics ; Fracture ; Rock mechanics ; Rheology
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  • 15
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    Springer
    In:  Berlin, Springer, vol. III/12, Supplement to III/4, no. XVI:, pp. 1-14, (ISBN 0-87590-299-5 (soft cover))
    Publication Date: 1982
    Keywords: Handbook of geophysics ; Handbook of physics ; Handbook of mineralogy
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  • 16
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    Elsevier
    In:  Amsterdam, I-VII + 329 pp., Elsevier, vol. 1, no. Publ. No. 12, pp. 127, (ISBN 3-540-44363-0)
    Publication Date: 1980
    Keywords: Geothermics ; application ; and ; prospection ; Earthquake hazard ; nuclear ; power ; plants ; Earthquake risk ; solar ; Energy (of earthquakes) ; pollution ; FROTH ; pp. ; 1-81, ; 279-288
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  • 17
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    Springer
    In:  Professional Paper, Physical Properties of Rocks, Berlin, Springer, vol. V/1, no. Subvol. b, pp. 1-96, (ISBN: 3-540-23712-7)
    Publication Date: 1982
    Keywords: Velocity ; Elasticity ; Physical properties of rocks ; Handbook of geophysics
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  • 18
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    Springer
    In:  Bull., Polar Proj. OP-O3A4, Physical Properties of Rocks, Berlin, Springer, vol. V/1, no. Subvol. b, pp. 339-346, (ISBN 0080419208)
    Publication Date: 1982
    Keywords: Rock mechanics ; glaciology ; Handbook of geophysics
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  • 19
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    Elsevier
    In:  Amsterdam, Elsevier
    Publication Date: 1980
    Keywords: Seismology ; Seismics (controlled source seismology) ; Wave propagation ; Waves ; Textbook of geophysics
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  • 20
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    Springer
    In:  Berlin, Springer, vol. V/1, subvol. b, pp. 559-932, (ISBN 0-935702-96-2)
    Publication Date: 1982
    Keywords: Rock mechanics ; Physical properties of rocks ; Handbook of geophysics ; Laboratory measurements ; density ; porosity ; elasticity ; electrical ; magnetic ; properties ; radioactivity ; moon ; ice ; Beblo ; Berktold ; Bleil ; Gebrande ; Grauert ; Haack ; Haak ; Kern ; Miller ; Petersen ; Pohl ; Rummel ; Schopper
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  • 21
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    Springer
    In:  Berlin, Springer, vol. 167, no. XVI:, pp. 385-389, (ISBN 0-12-305355-2)
    Publication Date: 1983
    Keywords: Artificial intelligence (AI) ; neu ; Textbook of physics
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  • 22
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    Springer
    In:  Berlin, Springer, vol. III/12, Supplement to III/4, no. XVI:, pp. 1-14, (ISBN 0-87590-299-5 (soft cover))
    Publication Date: 1980
    Keywords: Handbook of geophysics ; Handbook of physics ; Handbook of mineralogy
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  • 23
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    Springer
    In:  Dordrecht, IX+266 pp., Springer, vol. 3, no. ALEX(01)-FR-77-01, AFTAC Contract F08606-76-C-0025, pp. 329, (ISBN 1-903544-06-8)
    Publication Date: 1980
    Keywords: SEModelling ; Instruments ; Laboratory measurements
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  • 24
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    Elsevier
    In:  Bull., Open-File Rept., Signal Processing II: Theories and Applications, Orlando, Elsevier, vol. 37, no. 16, pp. 681-684, (ISBN 1-86239-165-3, vi + 330 pp.)
    Publication Date: 1983
    Keywords: Detectors ; Seismic arrays ; Seismology ; Schuessler ; Schussler
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  • 25
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    Elsevier
    In:  Animal Behaviour, 28 (4). pp. 1123-1126.
    Publication Date: 2017-02-01
    Description: Pairs of individually recognizable male Octopus vulgaris were observed in a large seawater tank containing two suitable homes (brick pots or plastic buckets). None of the animals established exclusive occupancy of one home and for much of the time both animals were associated together at the same site. Usually one of the two homes was preferred and its occupant was most likely to be the larger animal, or the earlier resident if they were of equal size. Large animals were observed to take food forcefully from smaller octopus. An arm alignment interaction is described which, it is suggested, may be a means by which two octopuses establish their relative sizes.
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  • 26
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    Springer
    In:  Bulletin of Volcanology, 47 (3). pp. 447-466.
    Publication Date: 2017-05-05
    Description: A program of geophysical research was carried out as a preliminary stage of study of the Santorini volcanic group. This area is of remarkable geothermal and volcanological interest, and the definition of a volcanological structural model is the starting point for an understanding of the local geodynamic processes. Gravity, magnetic and geoelectrical data proved that: (i) the core of the volcanic edifice consists of a sedimentary-metamorphic basement; (ii) the basement is tectonically disturbed and a linear tectonic system produces a graben-type structure in the middle part of the area.
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  • 27
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    Springer
    In:  In: Environmental Research and Protection. Springer, Berlin, Germany, pp. 383-384. ISBN 978-3-540-13469-5
    Publication Date: 2017-09-12
    Description: Die Probleme, die bei Speciesuntersuchungen von Spurenelementen mit Hilfe der Differentialpuls Anodic Stripping Voltammetrie auftreten, werden zu-sammenfassend dargestellt. Neben den bei der eigentlichen Bestimmung auftretenden Problemen, werden auch solche erwähnt, die mit der Probennahme sowie der Lagerung und Vorbehandlung der Proben in Zusammenhang stehen.
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  • 28
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    Springer
    In:  In: Phylogeny and Ontogeny. The reticuloendothelial system : a comprehensive treatise, 3 . Springer, Boston, MA, pp. 37-57. ISBN 978-1-4684-4168-0
    Publication Date: 2017-10-06
    Description: Sponges are diploblastic acoelomate Metazoa. They are sedentary, filter-feeding animals which utilize a layer of flagellated cells to pump a unidirectional water current through themselves. They are found in freshwater, but more abundantly in marine habitats. Sponges have been persistent throughout geological time from the Precambrian to the Recent, with special success during the Paleozoic. They are apparently the most primitive multicellular animals on a phylogenetic scale ranked by morphological complexity, although the levels of physiological and biochemical complexity found in sponges easily measure up to the degree of sophistication found in so-called higher animals. The Porifera (sponges) and Coelenterata are related as two phyla representing distinct stocks, but stemming from a presumed common although presently unknown origin (Hyman, 1940).
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  • 29
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    Elsevier
    In:  Journal of Colloid and Interface Science, 76 (2). pp. 541-556.
    Publication Date: 2016-11-30
    Description: A general method for simulating aerosol size distribution dynamics is developed. The method, based on dividing the particle size domain into sections and dealing only with one integral quantity in each section (e.g., number, surface area, or volume), has the advantages that the integral quantity is conserved within the computational domain and coagulations between all particle sizes are properly accounted for. To demonstrate the simplicity and accuracy of the method for a practical problem, the evolution of a power plant plume aerosol undergoing coagulation is simulated.
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  • 30
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    Springer
    In:  In: Geology of the Northwest African Continental Margin. , ed. by Rad, U. v. Springer, Berlin, pp. 498-525.
    Publication Date: 2018-01-31
    Description: Mesozoic deep water sedimentary rocks uplifted and exposed in basement complexes on the islands of Fuerteventura (Canary Islands) and Maio (Cape Verdes) help document the early Atlantic ocean and the volcanic history of these islands. On Fuerteventura ca. 1.5 km of terrigenous quartzose clastics, black shales, and subordinate redeposited limestones of early Cretaceous age are overlain first by Albian-Cenomanian marls and clastics, showing extensive soft sediment slumping, then after a hiatus by Senonian nannofossil chalks with chert nodules. After a further break alkalic submarine volcanic rocks, largely hyaloclastics, were erupted, then overlain by redeposited bioclastic limestones and volcaniclastics of Oligocene age. A dyke complex was intruded, then the basement complex was uplifted, peneplaned, and overlain by Neogene plateau lavas. On Maio the basement complex comprises mafic pillow lavas of midocean ridge character overlain by up to 4 00 m of deep water sedimentary rocks. Upper Jurassic to lower Cretaceous radiolarianrich pelagic limestones are succeeded by middle and upper Cretaceous sequences of mudstones, redeposited limestones, chalks, tuffs, and volcaniclastics which document the onset of volcanism. During a sedimentary hiatus plutonic rocks were intruded, uplifted, then eroded to produce conglomerates of late Miocene age. These are overlain by several series of gently dipping subaerial alkaline basalt flows. Comparisons with D.S.D.P. sites, oil wells and on land geology confirm that the lower Cretaceous Fuerteventura quartzose clastics formed part of a deep water fan complex located close to the Atlantic continent-ocean boundary. Comparable flysch is known in the Moroccan basin, in the Betic-Maghrebide system and the feeding Tan-Tan-Cape Bojador delta system. The inferred disconformity between Cenomanian and Senonian is part of a widespread depositional hiatus associated with slumping on the adjacent west African continental margin. On Maio pelagic limestones comparable with the Tethyan Maiolica facies were deposited on a subsiding? middle/late Jurassic ocean ridge before uplift related to onset of volcanism probably in the late Cretaceous.
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  • 31
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    Elsevier
    In:  Journal of Experimental Marine Biology and Ecology, 75 (2). pp. 171-190.
    Publication Date: 2016-04-25
    Description: The exchange of inorganic nutrients; ammonium, nitrate and reactive phosphate between burrows of the infaunal polychaete Nereis virens Sars and the overlying water was assessed using V-shaped sediment cores. Exchange was determined by monitoring ventilation current and nutrient concentration of in- and excurrent water. Ammonium supply appeared independent of overlying water concentrations, showing a constant release of 0.5 μmol·h−1 (for a 2-g individual + burrow system) at concentrations from 2 to 87 μM. Of this release ≈40% originated from worm excretion, and the rest from microbial mineralization. Nitrate and phosphate exchange appeared very sensitive to overlying water concentrations, having equilibrium (zero flux) at 10–15 and 3 μM, respectively. Below these concentrations nitrate showed a slight release (due to nitrification), whereas phosphate was released at a rate of 3.2 × 10−2 μmol·h−1 at 1 μM (mineralization and desorption). Above equilibrium they both were removed during water passage through worm burrows, reaching 0.4 μmol·h−1 for nitrate at 107 μM (nitrate reduction) and 3.7 × 10−2 μmol·h−1 for phosphate at 5.6 μM (adsorption processes). The burrow system apparently acted as a buffer for phosphate and, to some degree, nitrate in the overlying water. At the study site (Norsminde Fjord estuary) nereid burrows were estimated to increase the sediment-water interface 150%. About 17% of the water column was cycled through the sediment by Nereis each day. The worm + burrow system was estimated to release 95 μmol· m−2·h−1 ammonium to the overlying water, which was ≈76–90% of the total release of ammonium from the sediment (30–36% was worm excretion).
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  • 32
    Publication Date: 2016-04-08
    Description: Acoustic basement lies at an average of between 6.0 and 6.5 sec two-way time below sea level in the southern Rockall Trough and northern Porcupine Abyssal Plain. The overlying sedimentary succession reaches maximum thicknesses of at least 4.0 sec, and can be divided by 3 regionally-developed seismic reflecting horizons, which are used as a framework to establish an acoustic stratigraphy for the area by selecting three “type” seismic sections. These reflectors are named, in ascending order, Shackleton, Charcot and Challenger. The area is crossed by E—W basement high structures, the Clare Lineament (which may be an easterly extension of the Charlie Gibbs Fracture Zone), that separates the Porcupine Abyssal Plain from the eastern part of southern Rockall Trough. Under the latter, the post-Shackleton acoustic sequence is thickened, as if dammed to the north of the Clare Lineament, whilst a further thickening, above reflector Charcot, occurs along a NE—SW line somewhat farther north into the southern Rockall Trough. This can also be related to shallow-lying acoustic basement features. Pre-Shackleton sediments overlie a very irregular basement topography. The acoustic characters of the various sediment packages are described and it is speculated that major changes in the sedimentary environments took place across reflectors Shackleton and Challenger, the latter probably establishing the modern bottom current circulation patterns. No ages can be unequivocally assigned to the main reflectors, but previously published data suggest a late Eocene—Oligocene age for Challenger. Possible lavas or sills are identified in the succession between reflectors Shackleton and Charcot.
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  • 33
    Publication Date: 2016-04-08
    Description: Isopach asymmetry, and sediment component changes in DSDP cores from the SE Atlantic (Orange Basin) support the hypothesis of major drainage system changes in SW Africa during late Cretaceous—Cenozoic time. This involved alternations in the use of the 28°S (modern Orange River) and 31°S (modern Olifants River) exit points across the western escarpment by rivers carrying run-off from the Upper Orange/Vaal catchment areas, as well as radical re-organizations of internal drainage geometry. It is postulated that during late Cretaceous times the 28°S exit was used, with the Middle Orange River following a course in the interior well to the south (up to 150 km) of its modern channel. Sediment discharge rates from this river were relatively high (at least 10 × 106 m3 yr−1), and resulted in rapid advancement of the continental margin sediment prism west of the mouth by large-scale slumping. The Palaeogene Orange/Vaal river exit was via the 31°S escarpment crossing, and during the later part of this period, the Cape Canyon was cut across the continental shelf and slope. A significant reduction in sediment discharge (to 2.0 × 106 m3 yr−1) suggests that the Lower Tertiary climate for SW Africa was drier than that of late Cretaceous times. However, aridity did not commence until late Miocene times, when the Orange/Vaal discharge had switched back to the 28°S exit. Modern sediment discharge rates (6.5 × 106 m3 yr−1) are relatively high and reflect soil erosion caused by agricultural activity. The two major alterations in exit point of the Orange/Vaal (late Cretaceous—early Tertiary, and late Oligocene—early Miocene) are related to periods of low sea level, which promoted river capture adjacent to the western escarpment. An additional factor in the first course change may have been the disruption of the Middle Orange channel by late Cretaceous igneous intrusions. Less important internal reorganizations of the drainage system are postulated in late Miocene—Pleistocene times. Economic implications for offshore diamond distribution are briefly mentioned.
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  • 34
    Publication Date: 2016-04-12
    Description: Large Neogene slumps have affected over 260,000 km2 of the outer continental margin and adjacent Cape Basin off southwestern Africa. Individual structures cover areas up to 68,700 km2 and proximally are commonly composed of huge rotated sediment blocks up to 450 m thick and several kilometers across. Seismic shocks, possibly in conjunction with lower-slope undercutting by bottom-current erosion, are suggested as possible trigger mechanisms for these features which are all thought to be post-Pliocene (possibly Pleistocene) in age. Older slumps are also recognized along the margin and four cycles of sedimentation/slumping are identified: early Upper Cretaceous (I); late Upper Cretaceous (II); Palaeogene (III); and Neogene (IV). In the main part of the Orange Basin depocentre (west of Childs Bank) the Cretaceous slump styles are thought to represent Mississippi delta-type down-slope sediment cascades (with reverse faulting and mud diapirism) over 1 km thick which resulted from very rapid dumping of terrigenous material from the Orange River. Cainozoic slumps show a different tectonic style and locus and this is thought to reflect a change in sedimentation patterns which resulted from lower terrigenous input onto the margin, higher biogenic/authigenic sedimentation, and slowed crustal subsidence. A connection possibly exists between low sea level stands and the Cainozoic episodes of slumping.
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  • 35
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    In:  In: Fjord Oceanography. , ed. by Freeland, H. J., Farmer, D. M. and Levings, C. D. Springer, New York, pp. 299-304.
    Publication Date: 2016-01-12
    Description: M. Dunbar (1957) called attention to the existence of a small circular polynya about 50 m in diameter in Cambridge Fiord in northern Baffin Island for which there was no obvious explanation. Other small polynyas are known in arctic fjords which are usually the result of turbulent mixing in areas of strong currents (Sadler 1974), but Cambridge Fiord is 100 km long, its tidal range is small, and the polynya is situated within 300 m of the delta face at the head of the fjord so that strong turbulence is very unlikely. The annual reappearance of the polynya in late winter is confirmed by a series of aerial survey photographs taken by the Royal Canadian Air Force between 1952 and 1957 and also by reports from Inuit hunters from Pond Inlet. It is first seen within about two weeks of 15 March appearing in exactly the same position each year as a circle with a diameter of about 40 m. Over a period of about a week, a lead extends from the polynya to the shore and open water is visible in the tide crack for several hundred metres either side of the shore end of the lead. The lead, unlike the polynya, changes its position from year to year, but once formed it remains fixed until general break-up (Figure 1).
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  • 36
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    In:  Archives of Microbiology, 130 (3). pp. 234-237.
    Publication Date: 2016-01-21
    Description: Rhodopseudomonas globiformis is able to grow on sulfate as sole source of sulfur, but only at concentrations below 1 mM. Good growth was observed with thiosulfate, cysteine or methionine as sulfur sources. Tetrathionate supported slow growth. Sulfide and sulfite were growth inhibitory. Growth inhibition by higher sulfate concentrations was overcome by the addition of O-acetylserine, which is known as derepressor of sulfate-assimilating enzymes, and by reduced glutathione. All enzymes of the sulfate assimilation pathway. ATP-sulfurylase, adenylylphosphate-sulfotransferase, thiosulfonate reductase and O-acetylserine sulfhydrylase are present in R. globiformis. Sulfate was taken up by the cells and the sulfur incorporated into the amino acids cysteine, methionine and homocysteine. It is concluded, that the failure of R. globiformis to grow on higher concentrations of sulfate is caused by disregulation of the sulfate assimilation pathway. Some preliminary evidence for this view is given in comparing the activities of some of the involved enzymes after growth on different sulfur sources and by examining the effect of O-acetylserine on these activities.
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  • 37
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    In:  Archives of Microbiology, 132 (2). pp. 197-203.
    Publication Date: 2016-01-21
    Description: The ability to use adenosine 5′-phosphosulfate (APS) or 3′-phosphoadenosine 5′-phosphosulfate (PAPS) as the substrate for the initial reductive step in sulfate assimilation has been tested in most of the known Rhodospirillaceae species and in some chemotrophic bacteria. Improved and optimized methods for the synthesis and purification of the sulfonucleotides APS and PAPS are described. The production of acid volatile radioactivity from 35S-APS and 35S-PAPS was measured under various conditions in the presence and absence of non-labeled sulfate. Specific differences in the ability to reduce APS or PAPS were observed among the Rhodospirillaceae species and also the chemotrophic bacteria. APS was found to be the substrate of the thiolsulfotransferase in Rps. acidophila, Rps. globiformis, Rm. vannielii, Rc. purpureus, R. tenue, Rps. gelatinosa, in Alcaligenes eutrophus and Pseudomonas aeruginosa. PAPS was the substrate in Rps. capsulata, Rps. sphaeroides, Rps. sulfidophila, Rps. palustris, Rps. viridis, R. rubrum, R. fulvum, in Paracoccus denitrificans and in several Enterobacteriaceae. The presence of different enzymatic systems for sulfate reduction in the Rhodospirillaceae family is compared with their taxonomical grouping and their possible phylogenetic relatedness.
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  • 38
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    Springer
    In:  Archives of Microbiology, 136 (2). pp. 96-101.
    Publication Date: 2016-01-21
    Description: The mechanism of sulfate assimilation was investigated in Rhodopseudomonas sulfidophila, a bacterium able to grow either photoautotrophically, with sulfide as electron donor, or photoheterotrophically with sulfate as sole sulfur source. ATP sulfurylase, adenosine-5′-phosphosulfate kinase, 3′-phosphoadenosine-5′-phosphosulfate sulfotransferase, thiosulfonate reductase and cysteine synthase were present. Reduced sulfur compounds, especially sulfide and sulfite repressed all steps of sulfate activation and reduction including sulfate uptake. Adenosine-5′-phosphosulfate kinase activity in contrast to the other activities was high in the presence of cysteine or reduced glutathione in the growth medium. Sulfur was incorporated into the cellular sulfolipid from sulfate and also from reduced sulfur compounds like cysteine and thiosulfate. The activity of 3′-phosphoadenosine-5′-phosphosulfate sulfotransferase was rapidly lost during gel filtration or dialysis. From comparison with other sulfotransferases and from the specific cofactor requirement for the enzyme of R. sulfidophila it is concluded that two different low molecular weight cofactors are required in this system. A reaction sequence is proposed involving thioredoxin as the reductant of another dialysable low molecular weight cofactor, that binds to the protein.
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  • 39
    Publication Date: 2016-01-22
    Description: A new purple nonsulfur bacterium was isolated from enrichment cultures of a sulfide-containing marine lagoon. The bacterium is similar to Rhodopseudomonas capsulata and is described as a new species of the genus Rhodopseudomonas: Rhodopseudomonas adriatica. Cells are non-motile, 0.5–0.8 μm by 1.3–1.8 μm, and multiply by binary fission. Intracytoplasmic membranes are of the vesicular type. The photosynthetic pigments are bacteriochlorophyll a and carotenoids of the spheroidene group. Growth is possible anaerobically in the light and at low pO2 in the dark. Biotin and thiamine are required as growth factors. A wide variety of organic compounds, as well as sulfide and thiosulfate, are used as photosynthetic electron donors. Sulfide is oxidized to elemental sulfur, which is subsequently converted to sulfate, whereas thiosulfate oxidation occurs without measurable intermediate. Rhodopseudomonas adriatica is unable to assimilate sulfate, growth is only possible in the presence of a reduced sulfur compound.
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  • 40
    Publication Date: 2016-01-22
    Description: Seven strains of five species of the genus Ectothiorhodospira were characterized by oligonucleotide cataloguing of their 16S rRNA in order to determine the phylogenetic relationship to one another and to other phototrophic purple bacteria. All representatives of Ectothiorhodospira are members of that line of descent defined by phototrophic purple sulfur bacteria and relatives, showing a moderate relationship to those phototrophic organisms forming globules of elemental sulfur inside the cell (Chromatium and relatives). The 5 Ectothiorhodospira species fall into two subgroups. E.halophila, E. halochloris and E. abdelmalekii form one, E. mobilis, E. shaposhnikovii and the unnamed strain BN 9906 form the second subgroup. Within the two subgroups the strains are closely related, while the degree of relatedness found between members of the two subgroups is more distant.
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  • 41
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    In:  Deutsche Hydrographische Zeitschrift, 37 (2). pp. 57-69.
    Publication Date: 2019-09-23
    Description: Radiative transfer modelling for a coupled ocean-atmosphere system near 685 nm indicates a sufficiently high fluorescence signal of the chlorophyll a transmitted to the top of the atmosphere. However, only the shortwave half is seen at the top of the atmosphere, the longwave half is fully masked by atmospheric oxygen and water vapour absorption. The impact of atmospheric aerosol extinction on the signal transmission is almost negligible. The Hα line of the sun, atmospheric water vapour absorption, and chlorophyll absorption near 670 nm influence radiative transfer in the shortwave tail of the fluorescence line making the search for a baseline in order to eliminate the background radiation a difficult task.
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  • 42
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    In:  In: Eddies in marine science. , ed. by Robinson, R. A. Springer, New York, USA, pp. 181-199.
    Publication Date: 2013-01-15
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  • 43
    Publication Date: 2016-05-30
    Description: A geochemical rock- and soil-sampling program was carried out in the vicinity of eight concealed “Cyprus type” deposits, occurring in marginal mafic to intermediate metapillow lavas of the Troodos Ophiolite Complex. The mineralization of massive and stockwork sulfide ore is characterized by the predominance of pyrite, intergrown with less chalcopyrite and minor amounts of sphalerite. Background values of Hg are in the range of 8–12 ppb for soils and 3–6 ppb for surface rocks. Anomaly/background ratios of 10:1 (soils) and 5:1 (rocks) have been found only, where Hg migrated along channels formed by faults cutting shallow-seated mineralization. Here, Hg sometimes shows significant correlations with Cu, Zn, Ba and exceptionally with Co. However in one case an Hg anomaly in soils and surface rocks was detected directly over a deposit. The use of Hg as indicator element for these types of deposits is therefore limited. Buried mineralization may be delineated more distinctly by Cu, Zn and Ba.
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  • 44
    Publication Date: 2016-06-28
    Description: The Middle Triassic carbonate series of the Hochstaufen-Zwieselmassif reflect the last stage of a northward progradation of a wide southern reef platform extending into the attached northern basin. Regional facies differentiation was caused by differences in the morphology of the basin. A massive central reef core, exhibiting clear ecological zonation, developed along the slope of the slightly deeper eastern part of the basin. The shallower western parts, however, were quickly filled up by forereef debris and overlain by sediments of the rapidly spreading lagoon. A typical grapestone facies includes intercalations of vadose pisolitic crusts, thus indicating a shallow marine platform environment, which was sporadically interrupted by areas of subaerial exposure. Various sediment types occurring along the platform margin reflect synsedimentary mass movements. These were induced by tectonic disturbances caused by different rates of subsidence between the rapidly subsiding platform and the slowly subsiding basin. Forereef rocks which have been entirely lithified were affected by various stages of internal brecciation during this process. In contrast, basinal sediments which were semilithified or patchily cemented exhibit plastic deformation (slumping) and subsequent disintegration into intraformational breccias and debris flows. Turbidites were induced in cases of higher pore water saturations. All these mass mobilisations took place on gentle slopes. This assumption is supported by the observation of initial reef growth flourishing on protected areas of the foreslope. Along a gentle slope, differential rates of subsidence can easily be balanced by plastic deformation and dislocation of basinal material. This is supported by the fact that no prominent synsedimentary fault system could be observed along the platform margin. The facies differentiation of the central reef core is substantiated by a clear eclogical zonation of organisms. The lower, more protected portions of the central reef belt were occupied by theTubiphytes zones. Along the reef front the Coral-Solenoporacean biocoenoses found favorable living conditions. The high energy sediments of the reef flat exhibit a highly diverse Calcisponge—Hydrozoan—Coral community. Towards backreef areas a small belt was inhabited by a typicalThecosmilia —Thaumatoporella biocenosis. Die mitteltriadischen Karbonatserien des Hochstaufen-Zwieselmassives im Mittel-abschnitt des Alpennordrandes dokumentieren die jüngste Ausbreitungsphase einer ausgedehnten südlichen Riffplattform gegen ein nördlich vorgelagertes Becken. Die Entwicklung eines ausgeprägten Reliefs innerhalb des beckens verursachte eine starke regionale Faziesdifferenzierung. In den geringfügig tieferen östlichen Beckenabschnitten entwickelte sich ein Riffgürtel mit deutlicher Zonierung, während in den flacheren westlichen Beckenarealen über Vorriffsedimenten direkt eine lagunäre Entwicklung folgt. Zyklische Einschaltungen von vadosen Pisolitkrusten in eine überwiegende Grapestonefazies weisen den lagunären Ablagerungsraum als flachstmarine von zahlreichen Auftauchbereichen durchsetzte Plattform aus. Entlang des Plattformrandes dokumentieren zahlreiche Sedimenttypen synsedimentäre Massenbewegungen. Diese resultieren aus tektonischen Turbulenzen verursacht durch differentielle Absenkungsraten zwischen rasch absinkender Plattform und nur geringfügig absinkendem Becken. Diese Massenbewegungen führen in den vollständig lithifizierten Vorriffsedimenten zu unterschiedlichen Stadien von Internbrekziierung. Die meist nur partiell oder fleckenhaft zementierten Beckensedimente reagieren hingegen auf die gleichen Beanspruchung mit plastischer Deformation. Rutschfalten, intraformationale Brekzien. Debris Flows und schließlich proximale Turbidite dokumentieren zunehmende Deformation und Dislociierung. All diese Massenverlagerungen fanden entlang eines nur geringfügig geneigten Plattformabhanges statt. Dies wird durch das Aufblühen von initialem Riffwachstum in verschiedenen Abschnitten des Beckenabhanges dokumentiert. Aufgrund des geringfügigen Neigungswinkels des Plattformabhanges konnten die differentiellen Absenkungsraten im wesentlichen durch plastische Deformation und Massenverlagerung des Beckenmaterials aufgefangen werden. Daher kam es auch nicht zur Ausbildung von tiefreichenden Störungssystemen entlang des Plattformrandes. Die fazielle Differenzierung des Zentralriffbereiches korrespondiert mit einer ausgeprägten ökologischen Zonierung. Der untere geschütztere Abschnitt des Zentralriffgürtels wird von derTubiphytee-Zone eingenommen. Entlang der Riff-front etablierte sich eine Korallen-Solenoporaceen Biocoenose, während die hochenergetischen Sedimente des “reef flats” eine hochdiverse Kalkschwamm— Hydrozoen—Korallenvergesellschaftung aufweisen. Gegen das Rückriff folgt ein schmaler Gürtel mit einer typischen Thecosmilien-Thaumatoporellen Biocönose.
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  • 45
    Publication Date: 2020-07-14
    Description: The luminescent flashing capabilities and swimming behavior were examined for two species of small midwater squids (Pterygioteuthis microlampas and P. giardi). Recently captured squid were placed in a small aquarium, where their movements and luminescent flashes could be recorded with an image intensifier, a photomultiplier tube and associated equipment. Flashing behavior was initiated by disturbing the squid with an electrical shock. The following 4 behaviors were observed: (1) a short flash and a rapid departure from the electrode; (2) a short flash and a delayed, slow departure from the electrode; (3) a longer flash persisting after a rapid departure from the electrode; (4) a longer flash when departure was prevented by continuing the shock. Luminescent flashes probably have a general defensive function, discouraging or disrupting an attack by potential predators, and within this context there may exist numerous strategies involving flashes.
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  • 46
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    In:  Marine Biology, 75 . pp. 231-240.
    Publication Date: 2018-09-18
    Description: Ammonium regeneration, nutrient uptake, bacterial activity and primary production were measured from March to August 1980 in Bedford Basin, Nova Scotia, Canada, a eutrophic environment. Rates of regeneration and nutrient uptake were determined using 15N isotope dilution and tracer methodology. Although primary production, nutrient uptake and ammonium regeneration were significantly intercorrelated, no relationship was detected between these parameters and heterotrophic activity. The average contribution of ammonium to total nitrogen (ammonium+nitrate) uptake was similar in the spring and in the summer (approximately 60%). On a seasonal average basis, 36% of the phytoplankton ammonium uptake could be supplied by rapid remineralization processes. In spite of the high average contribution of NH4 regeneration to phytoplankton ammonia uptake, there is indirect evidence suggesting that other NH4 sources may occasionally be important.
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  • 47
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    In:  In: Aquatic Oligochaeta: Proceedings of the Second International Symposium on Aquatic Obligochaete Biology, held in Pallanza, Italy, September 21–24, 1982. , ed. by Bonomi , G. and Erseus, C. Developments in Hydrobiology, 24 . Springer, Berlin, Germany, p. 96, 96 pp. ISBN 978-94-009-6565-2
    Publication Date: 2017-01-30
    Description: Although European boreal shores are inhabited by only a relatively small number of oligochaete species, the life histories and reproductive strategies of these species vary considerably. Growth in naidid populations mainly depends on asexual reproduction (paratomy, fragmentation) within a short period of individual life spans, whereas sexual outbreeding plays only a minor role. Naidid populations are characterized by considerable fluctuations of abundance. Aquatic and mesopsammic tubificids represent a ‘conservative’ type of sexual reproduction within well defined breeding periods. Population structure is fairly stable. Enchytraeids show a variety of improvements of the sexual outbreeding scheme which lead to an amazing plasticity. Other forms of reproduction such as parthenogenesis and fragmentation seem to be of greater importance in enchytraeids. The flexible adaptability of development and reproductive capacity in naidids and enchytraeids is mainly controlled by habitat conditions and population size. A complete review of the biology and ecology of marine Oligochaeta is published in: Giere, O. & O. Pfannkuche, 1982. Oceanogr. mar. Biol. ann. Rev. 20: 173–308.
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  • 48
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    In:  Deutsche Hydrographische Zeitschrift, 36 (2). pp. 61-77.
    Publication Date: 2016-11-02
    Description: Anhand hundertjähriger Meßreihen wurden langfristige Salzgehaltsänderungen in der Unterweser und ihre möglichen Ursachen untersucht. Dabei wurde angestrebt, die natürlichen und die anthropogenen Einflüsse auf den Salzgehalt zu trennen. Trotz des unvollständigen Datensatzes konnten der Einfluß des Einzugsgebietes und Salzgehaltsschwankungen des angrenzenden Meeresgebietes nahezu eliminiert werden. Wegen der langzeitigen Änderungen der Gezeiten in der Nordsee waren genaue Aussagen über die Auswirkung der in den letzten hundert Jahren in der Unterweser durchgeführten Baumaßnahmen auf den Salzgehalt nicht möglich. Unsere Ergebnisse geben Hinweise für moderne Meßnetze zur Bestimmung der Wasserqualität.
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  • 49
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    In:  Geologische Rundschau, 72 (2). pp. 605-618.
    Publication Date: 2018-01-17
    Description: A suite of marble specimens from the Sierra Alhamilla (Spain), deformed to large strains under natural conditions at about 300° C shows distinct variations in microstructure and fabrics. It can be demonstrated that the development of crystallographic preferred orientations and grain shape fabrics are strongly dependent on recrystallized grain size. This is interpreted to reflect the relative importance of various deformational mechanisms. Superplasticity seems to have a sharp upper grain size limit at 10–15 /smm. Within the power law creep regime, deformation in fine grained aggregates is probably dominated by diffusional, in coarser ones by dislocation mechanisms. The transition is a gradual one, and may span a grain size range of 30 /sm.
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  • 50
    Publication Date: 2018-06-29
    Description: Ceratium hirundinella cells in Lake Constance divided during the second half of the night. Growth rates are calculated from the fraction of cells undergoing cell division. Potential growth rates are compared with observed changes in population density. The discrepancy between both is discussed as a possible function of fungal parasitism.
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  • 51
    Publication Date: 2016-05-10
    Description: Two megameter long XBT sections passing through the Atlantic between the Iberian Peninsula and the equatorial Brazilian shelf, and between the Peninsula and the Cape region of South Africa were obtained during supply cruises to the antarctic in November 1980 and March 1981. Most of the individual probes reached an observation depth of nearly 800 m allowing statements on the thermal stratification and zonation of theWarmwassersphäre in the open ocean. Our new data are compared with a number of earlier long sections. As a general result we identify five zones dividing different hydrographic regions. Zone 1 is characterized by the clear influence of the Mediternean Undercurrent on the lower boundary of theWarmwasserphäre creating nearly thermostatic conditions below 300 m off Portugal. The adjacent zone 2 is identical with the Subtropical Convergence, where theWarmwassersphäre reaches its maximum depth (15°C isotherm at about 300 m). We call the equatorial region zone 3 and present an improved scheme of its current system and its thermal stratification. Zone 4 is marked by the Benguela Current and its northern extension. In a final zone 5 we show the influence of the Agulhas Current extension on the stratification.
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  • 52
    Publication Date: 2019-05-02
    Description: The squid Loligo opalescens (Cephalopoda, Mollusca) was reared in artificial sea water in a closed system consisting of two 1300-l circular tanks. When the squids reached mantle lengths of 20 to 30 mm, they were transferred to a 10 000-l closed system raceway. From hatching, mantle length increased exponentially at a mean rate of 1.69% per day throughout the experiment. The largest and longest-lived squid attained a maximal size of 77 mm mantle length in 8 months. Only live food organisms, which consisted of copepods, other crustaceans and fishes, were accepted by the squids. Mortality, attributed to starvation and fin damage, was greatest during the first 20 days and again between days 45 and 70.
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  • 53
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    In:  Continental Shelf Research, 1 (4). pp. 405-424.
    Publication Date: 2016-10-11
    Description: Faunal structure is described for the planktonic molluscs of the Middle Atlantic Bight based on two years of seasonal data from the continental shelf. Collection and taxa groups are constructed using numerical classification and reciprocal averaging ordination. Discriminant analysis is used to relate surface collection groups to physical variables, then taxa group distribution among these collection groups is analyzed by nodal fidelity analysis. The areal distribution of dominant species is presented by season, as is their surface temperature-salinity distribution. Four communities are recognized on the continental shelf. A subarctic community, including Limacina retroversa, Paedoclione doliiformis, and Clione limacina, is advected down the central shelf region from the northeast. A Gulf Stream community of weak vertical migrators, including Limacina trochiformis, Cavolinia longirostris, Creseis conica, Atlanta peroni, and A. gaudichaudi, is introduced onto the shelf in occasional intrusions across the shelf-edge front. A depth-limited warm-water community of strong vertical migrators, including Limacina inflata, L. bulimoides, L. lesueuri, and Cavolinia inflexa is generally confined offshore of the 100-m isobath since the extent of their daily vertical migration is greater than the bottom depths on the continental shelf. A coastal community, including the larvae of Loligo pealei and of Ensis directus is found in coastal water of local origin and is generally confined within a coastal boundary layer.
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  • 54
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    In:  Facies, 11 (1). pp. 109-155.
    Publication Date: 2016-06-28
    Description: Die Lagunenkarbonate des Wettersteinkalks weisen zyklische Sedimentationsmuster riffnaher und rifferner Ablagerungsräume auf. Die Zyklen der riffnahen Lagunensequenzen Setzen sich aus einer dickbankigen Folge von Kalkbänken mit einer dominanten Grapestonefazies und dünnen dolomitischen Zwischenschichten mit vadosen Pisolithkrusten mit einem sehr breiten Spektrum an verschiedensten Gefügen des vadosen Milieus zusammen. Die riffernen Zyklen umfassen mächtige Dasycladaceen-oder Schlickbänke und geringmächtige Zwischenlagen mit Loferiten, Stromatolithen und Peritidalbrekzien. In höheren Profilsequenzen schalten sich zahlreiche syngenetische Karsthorizonte mit einem sehr vielfältigen Strukturinventar ein. Die Verkarstung verursachte entscheidende Veränderungen im Gefüge der Riff-und Lagunenkarbonate des Wettersteinkalks. Epigenetische Dolomitisierungsvorgänge im oberflächennahen und im tief versenkten Karststockwerk scheinen die wichtigsten Prozesse bei den Veränderungen des Gesteinsgefüges der unterschiedlichen Faziesbereiche gewesen zu sein.
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  • 55
    Publication Date: 2016-07-08
    Description: The cause of the climatically controlled fluctuations in the carbonate content of deep-sea sediments remains the subject of uncertainty and debate. Three variables are involved: supply of biogenic carbonate, loss by dissolution, and dilution by non-carbonate phases. It is suggested that 230Th, which is produced in the ocean at a constant rate provides a reliable reference for measuring variations in rate of sedimentation on a regional scale. Results of a preliminary analysis based on published data indicate that, for depths at and above the lysocline, the carbonate fluctuations observed in cores from the North Atlantic Ocean are due primarily to variations in the terrigenous clay input, which was 2–5 times higher during glacials than during interglacials. Carbonate deposition appears to have been somewhat reduced during glacials, but probably not by more than a factor of 2. From published 230Th232Th profiles it appears that the South Atlantic Ocean also received increased inputs of terrigenous clay during glacial periods.
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  • 56
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    In:  Marine Biology, 76 (1). pp. 47-54.
    Publication Date: 2020-07-14
    Description: Statoliths of the short-finned squid Illex illecebrosus were chemically analyzed to define their chemical composition and surveyed by scanning electron microscope to differentiate internal structural patterns. X-ray diffraction data demonstrated that L Illecebrosus statoliths were composed principally of CaCQ in the aragonite crystal form. The crystals occurred in a protein matrix to form incremental patterns which radiated from the nucleus to the edge of the statoliths. The protein matrix comprised approximately 5% of the statolith by weight. The protein was principally composed of acidic amino acids. A high abundance of aspartic acid in the protein matrix indicated that the matrix would function as a template in the initiation and acceleration of the crystal growth of CaCO. The rhythmic microstructural patterns, constructed of aragonite crystals in the protein matrix, wer e suggested to be daily in formation and subsequent growth estimations were in agreement with known life history information. The stable isotopic composition of the carbonate of L illecebrosus statoliths suggested that oxygen may be deposited in isotopic equilibrium with the surrounding environment while carbon appeared to be related to biological processes. The information recorded in the statotiths as incremental growth and stable isotopic composition could provide valuable insights into the ecological history of squid.
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  • 57
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    In:  In: Living Fossils. Springer, Californien, pp. 247-256.
    Publication Date: 2019-04-02
    Description: The two quotes above are representative of the controversy concerning the age of Nautilus, the last externally shelled cephalopod. If we accept the first age estimate, we would have to include Nautilus as a living fossil, the end member of a clade that has survived for a long time and undergone little morphologic change.
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  • 58
    Publication Date: 2019-09-23
    Description: In two closely spaced moorings in the Kiel Bight, four different current meterstwo rotor current meters (Aanderaa and Vector averaging), an acoustic current meter (designed by Gytre), and a pendulum current meter (designed by Niskin) were moored for 22 days. The Vector averaging current meter (VACM) was used as reference instrument on one mooring with the floatation at 7 m depth. The floatation of the second mooring was at 5 m depth in the first 17 days of the experiment, but in 2.7 m depth in the last 5 days to make their mooring more effected by surface waves. The Niskin wing current meter was most effected by wave-induced mooring motion. The Gytre instrument showed the smallest surface-wave effects. The vector variances of this instrument in 7.4 m depth on the surface-wave effected mooring and those of the VACM in 10 m depth on the reference mooring were about equal.
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  • 59
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    In:  Marine Geology, 54 (3-4). pp. 237-247.
    Publication Date: 2016-09-05
    Description: DSDP cores from areas of low (Site 505) and high heat flow (Site 504 B) near the Costa Rica Rift, together with seismic profiles from the Panama Basin, have been studied to determine the relationship between: (1) carbonate content and physical and acoustic properties; and (2) carbonate content, carbonate diagenesis and acoustic stratigraphy. Except for ash and chert layers, bulk density correlates strongly and linearly with carbonate content. Velocity is uniform downcore and only small variations at a small scale are measured. Thus an abrupt change in carbonate content will cause abrupt changes in acoustic impedance and should cause reflectors that can be detected acoustically. A comparison of seismic profiler reflection records with physical properties, carbonate content and reflection coefficients indicates that the main reflectors can be identified with ash layers, diagenetic boundaries, and carbonate content variations. Diagenesis of carbonate sediments is present at Site 504 B in a 260 m-thick ooze—chalk—limestone/chert sequence. These diagenetic sequences occur in areas of higher heat flow (200 mW m−2). Seismic profiler records can be used to map the extent and depth of these diagenetic boundaries.
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  • 60
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    In:  In: Structure and Development of the Greenland-Scotland Ridge: New Methods and Concepts. , ed. by Bott, M. H. Springer, New York, pp. 549-589.
    Publication Date: 2016-07-14
    Description: Seismic, lithostratigraphic, faunal, and isotopic evidence from the western and northern North Atlantic indicates that formation of northern sources for strongly circulating bottom water began in the late Eocene to early Oligocene. The widely distributed reflector R4 correlates with an unconformity eroded along basin margins at the Eocene/Oligocene boundary. This change in abyssal regime also correlates with a major benthic foraminiferal turnover in the deep southern Labrador Sea (DSDP Site 112) and with a faunal reorganization in the Bay of Biscay. The principal bottom-water source probably was of Arctic origin; it entered the Norwegian Sea following separation of Greenland and Spitsbergen and flowed south across the Greenland-Scotland Ridge through the Faeroe-Shetland Channel and possibly across a sill east of Greenland. This flow may have been supplemented by dense Arctic water entering the basin via Nares Strait and Baffin Bay, and by cooling and sinking of saline surface water south of the Greenland-Scotland Ridge and in the Labrador Sea. Current-controlled sedimentation and erosion, often of a chaotic nature, continued through the Oligocene above reflector R4, but the general intensity of abyssal circulation is thought to have decreased. Above reflector R2 (upper lower Miocene) current-controlled sedimentation became more coherently developed, and a major phase of sedimentary drift development was initiated. We interpret this to be a result of a further general reduction and especially a stabilization of the abyssal circulation, possibly linked with degeneration of numerous fracture-zone conduits that previously funnelled bottom water across the Reykjanes Ridge. The gross nature of the circulation has not changed substantially since the middle Miocene, although it has been punctuated by further climatic and tectonic events.
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  • 61
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    Elsevier
    In:  Journal of Volcanology and Geothermal Research, 7 (1-2). pp. 107-137.
    Publication Date: 2016-09-12
    Description: Glass separates from 115 ash layers derived from the Kamchatkan (DSDP Site 192; 34 layers), the eastern Aleutian (DSDP Site 183; 56 layers) and the Alaska Peninsula (DSDP Site 178; 25 layers) volcanic arcs have been analyzed for up to 28 elements. In addition, the abundance and diversity of associated mafic phenocrysts have been evaluated. The resulting data set has made possible an evaluation of the late Miocene to Recent changes in composition of ashes derived from North Pacific volcanic arcs and of the factors controlling the evolution of highly siliceous magmas. We find no evidence for a general transition from arc tholeiite to calc-alkalic magma parentage of ashes derived from the volcanic arcs during the last 10 m.y., but instead find 0.1- to 0.5-m.y. intervals during which particular types of volcanism are prevalent. Most convincing is the transition from arc tholeiite to calc-alkalic for ashes derived from Kamchatka during the last 0.8 m.y., a change believed to be associated with a landward shift in the site of magma generation. Considered together, ashes derived from North Pacific volcanic arcs have been becoming more siliceous during the last 1.5 m.y. and may be associated with accelerated subduction during the same time interval. Hydrous phenocrysts (e.g., biotite) are typically associated with low-silica deep-sea ashes, but not with terrestrial volcanic rocks of comparable silica contents, suggesting the important role of water in the evolution of siliceous magma. REE patterns and relative abundances of mafic phenocrysts demonstrate the importance of fractional crystallization in controlling the evolution of highly siliceous arc magmas. REE increase with increasing silica, but become less concentrated in ashes with SiO2 〉 64%. Eu anomalies increase throughout the SiO2 range. Initial fractionation is dominated by clinopyroxene and plagioclase with amphibole strongly influencing fractionation above 64% SiO2.
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  • 62
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    In:  Hydrobiological Bulletin, 17 (1). pp. 21-27.
    Publication Date: 2018-07-02
    Description: Natural phytoplankton from Lake Constance was exposed to competition experiments in continuous culture at 6 different molar rations of PratioSi as potentially limiting nutrients. As predicted by theory there was competitive exclusion of all species but one at single nutrient limitation, and coexistence of two species in steady state when P was limiting for one and Si for the other species. In one case coexistence of three species occurred. Equilibrium species composition, which stabilized after 3 to 6 weeks of cultivation, was independent of the species composition of the inoculum and only controlled by the nutrient regime. Comparability of experimental results and field observations is discussed.
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  • 63
    Publication Date: 2018-06-06
    Description: Seasonal variations in bacterial populations (total number, biomass, biomass-spectrum, number of dividing cells) as well as in concentrations and decomposition rates of particulate organic material were followed in a sandy mud sediment of the Western Kiel Bight (Baltic Sea; FRG). The strong seasonal variations observed could be traced back to the effect of certain ecological situations and events in the sediment from which the input of the phytoplankton blooms in autumn and spring, respectively, the accumulation of organic material during winter, and the spring development of the benthic fauna turned out to be the most important. Bacterial carbon net production following the breakdown of the phytoplankton blooms ranged between 9 μg (autumn) and 16 μg (spring) per g of dry weight sediment per day. The consequences of shifts in the size composition of the bacterial populations as well as the importance of the measurement of enzymatic decomposition rates of particulate organic material in sediments are demonstrated and discussed in relation to the events mentioned above
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  • 64
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    In:  Marine Biology, 81 (1). pp. 81-86.
    Publication Date: 2014-01-23
    Description: In SCUBA-diving monitored field experiments (Flensburg Fjord, 15 m, 1981) and parallel aquarium tests,the behavior of Metridium senile under anoxic conditions and its oxygen-deficiency resistance were studied. When oxygen is lacking the fluffy sea anemone diminishes body surface, and then, successively, shuts off most energy consuming activities. By means of this strategy, 50% of the tested individuals survived 3 weeks of total anoxia
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  • 65
    Publication Date: 2019-09-23
    Description: The response of the benthos to the break up of anoxia in the Kiel Bight (Western Baltic Sea), and to three succeeding events of “external” food supply, consisting of a settled autumn plankton bloom, resuspended matter and macrophyte input during winter, and of a sedimented spring phytoplankton bloom, is described on a community level. The first input of oxygen broke up anoxic conditions and made stored food resources available to decomposition. This “internal” food supply, mainly consisting of protein (folin positive matter), was followed by a drastic increase in heat production and ATP-biomass and caused a period of low redox potential, which lasted for several weeks. During this phase, a plankton bloom (dinoflagellates and diatoms) settled to the sea floor. Although there was an immediate response of benthic activity, this food input was not completely consumed by the strongly disturbed benthic community. During winter resuspended matter and the input of macrophyte debris caused another maximum in benthic activity and biomass despite the low temperature. The response to sedimentation of cells from a diatom bloom during mid March was also without any time lag and was consumed within 5–6 wk. A comparison of the amount of particles collected in a sediment trap with the increase of organic matter in the sediment demonstrated that the sediment collected four times (autumn) and seven to eight times (spring) more than measured by the sediment trap. Strong indications of food limitation of benthic activity were found. During autumn and winter these indications were caused more by physical than by biological processes. The three events of “external” food supply caused a temporary shift in the type of metabolism towards fermentation processes and reduced the redox potential. In spring the development of the benthic community was still being strongly influenced by the events of the preceding summer and autumn.
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  • 66
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    In:  Tectonophysics, 94 (1-4). pp. 123-139.
    Publication Date: 2019-06-11
    Description: Many hotspot tracks appear to become the locus of later rifting, as though the heat of the hotspot weakens the lithosphere and tens of millions of years later the continents are split along these weakened lines. Examples are the west coast of Greenland-east coast of Labrador (Madeira hotspot), the south coast of Mexico-north coast of Honduras (Guyana hotspot), and the south coast of West Africa-north coast of Brazil (St. Helena hotspot). A modern day analog of a possible future rift is the Snake River Plain, where the North American continent is being “pre-weakened” by the Yellowstone hotspot track. This conclusion is based on reconstructions of the motions of the continents over hotspots for the past 200 million years. The relative motions of the plates are determined from magnetic anomaly isochrons in the oceans and the motion of one plate is chosen ad hoc to best fit the motions of the plates over the hotspots. However, once the motion of this one plate is chosen, the motions of all the other plates are prescribed by the relative motion constraints. In addition to the correlation between the predicted tracks and sites of later continental breakup, exposed continental shields correlate with the tracks. Their exposure may be the result of hotspot induced uplift which has led to erosion of their former platform sediment cover.
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  • 67
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    In:  Coral Reefs, 2 (3). pp. 129-150.
    Publication Date: 2019-06-17
    Description: This paper brings together widely scattered information on sexual reproduction in scleractinian corals. It includes a review of information and ideas on sex determination, gametogenesis, gametogenic cycles, fertilization and embryonic development, spawning and planula release, larval behavior, settlement and metamorphosis. The review deals with corals from different habitats and organismic assemblages, including tropical reef corals, temperate water corals, solitary and colonial forms. A summary table of coral species and their known reproductive characteristics is presented.
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  • 68
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    In:  Earth and Planetary Science Letters, 51 (2). pp. 415-434.
    Publication Date: 2021-03-01
    Description: The major tectonic elements of the Azores triple junction have been mapped using long-range side-scan sonar. The data enable the Mid-Atlantic Ridge axis to be located with a precision of a few kilometres. Major faults and other tectonic and volcanic elements of the ridge maintain their regional trend of 010° to 020° past the triple junction area. There is no oblique spreading, and only minor transform offsets of the Mid-Atlantic Ridge occur here. The main effect of the triple junction or Azores hot spot is to diminish the amplitude of the median valley to 200 m or less. There is no axial high: a topographic high seen on several profiles is located to the east of the Mid-Atlantic Ridge spreading axis and does not appear to have any fundamental significance. The third arm of the triple junction includes the Azores srreading centre which appears to have developed as a series of en echelon rifted basins (the Terceira Rift) extending from Formigas Trough at 36.8°N, 24.5°W to a point near 39.3°N, 28.8°W. There are indications that recent activity in the spreading centre may be concentrated in a series of ridges which flank the older rifted basins. Until recently the northwest end of the Terceira Rift was connected to the Mid-Atlantic Ridge axis either directly at an RRR junction, or via a transform fault. The triple junction has probably moved south during the last 6 Ma to a positin on the Mid-Atlantic Ridge near 38.7°N. Initiation of the Azores spreading centre may have occurred during the 36 Ma B.P. rearrangement of poles, with an RFF triple junction north from the East Azores fracture zone to the North Azores fracture zone and transferring a wedge of European plate to the African plate. The tectonic elements revealed by this study are in good agreement with inferred earthquake mechanisms and with the RM2 plate tectonic model of Minster and Jordan, but east-west motion between North America and Africa does not seem to be compatible with the other motions at the triple junction unless it is of very recent (2〉3 Ma) origin.
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  • 69
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    In:  Tectonophysics, 73 (1-3). pp. 151-168.
    Publication Date: 2021-06-08
    Description: The structural setting of the Maltese Islands is governed by two rift systems of different ages and trends and the interference of both. Accompanying faults are exposed at many places along cliffs and belong to the most spectacular phenomena of rift faulting of the world. Malta is part of a wide shelf bridge that connects the Ragusa platform of southern Sicily and the Tripolitanian platform of northern Libya. The archipelago is underlain by a continental crust of African provenance. The older rift generation traversing the islands strikes about 50° to 70° to create a basin-and-range structure on western Malta, Comino and eastern Gozo. This micro-province is framed by two master faults at an average distance of 14 km. Crustal extension started during the Early Miocene, as observed by growth faulting and sedimentary dikes parallel to the future rift. A syndepositional uparching of about 200 m has preceded the physiographical rifting in post-Middle Miocene times. Discrete dip-slip faulting created an external wedge block, split by internal tilt blocks of antithetic character, both compensating an average 15% crustal spreading normal to the rift axis. Shoulder upwarping of approximately 120 m has evolved synchronously with the rifting. Structures of the first generation are crosscut by still active, second-generation rift faults, which on Malta strike about 120°, but on Gozo between 80° and 90°. These faults are associated with the Pantelleria rift, whose deep trough sets immediately south of the islands. Rifting was mainly originated during Late Miocene/Early Pliocene time to continue in parts up to the Present. A set of transform faults runs through the straits on both sides of Comino to form a complicated en echelon or Riedel shear structure on easternmost Gozo and westernmost Malta. Shoulder upwarping related to the Pantelleria rift has considerably tilted the block of Malta NNE-ward and caused the inundated river valleys of the natural harbour of Valletta. The superimposition of two rift structures of different trends has been caused principally by a rotation of the controlling stress regime about 10 m.y. ago. The active Afro—Eurasian collision front is located about 200 km north and northwest of the islands. A contemporary change of plate tectonic stresses is discussed to explain the intraplate rift pattern on Malta as foreland-specific reactions to plate tectonic processes.
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  • 70
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    In:  Marine Geology, 60 (1-4). pp. 165-198.
    Publication Date: 2020-04-27
    Description: Wave-formed sedimentary structures can be powerful interpretive tools because they reflect not only the velocity and direction of the oscillatory currents, but also the length of the horizontal component of orbital motion and the presence of velocity asymmetry within the flow. Several of these aspects can be related through standard wave theories to combinations of wave dimensions and water depth that have definable natural limits. For a particular grain size, threshold of particle movement and that of conversion from a rippled to flat bed indicate flow-velocity limits. The ratio of ripple spacing to grain size provides an estimate of the length of the near-bottom orbital motion. The degree of velocity asymmetry is related to the asymmetry of the bedforms, though it presently cannot be estimated with confidence. A plot of water depth versus wave height (h—H diagram) provides a convenient approach for showing the combination of wave parameters and water depths capable of generating any particular structure in sand of a given grain size. Natural limits on wave height and inferences or assumptions regarding either water depth or wave period based on geologic evidence allow refinement of the paleoenvironmental reconstruction. The assumptions and the degree of approximation involved in the different techniques impose significant constraints. Inferences based on wave-formed structures are most reliable when they are drawn in the context of other evidence such as the association of sedimentary features or progradational sequences.
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  • 71
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    In:  Journal of Experimental Marine Biology and Ecology, 69 . pp. 145-150.
    Publication Date: 2020-10-09
    Description: The ammonium ion (NH 4) content in the mantles, fins, arms, haemolymph, and buoyancy fluid of 17 species belonging to nine families was determined. Great individual variation of ammonium concentration was found in the buoyancy fluid of Liocranchia reinhardti (Steenstrup, 1856), i.e. 38-1108 mM, and in the vacuolized tissues of Histioteuthis macrohista N Voss, 1969, i.e. 50-775 mM.
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  • 72
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    In:  Marine Biology, 65 (1). pp. 1-12.
    Publication Date: 2021-05-05
    Description: The biology of Octopus vulgaris Cuvier inhabiting subtropical littoral reefs off the east coast of South Africa was investigated. Analyses of stomach contents and lair middens revealed that the mussel Perna perna was the dominant food organism. Growth rate of captive individuals was higher than has previously been recorded but food conversion was lower. Females became sexually mature at 900 g which is estimated to be attained in 3.6 months. Males became sexually mature at 400 g, which is estimated to be attained after 3 months. Results indicate that females live for 9–12 months and have the potential to reach 4 000 g in 240 d while males live for about 12–15 months and have the potential to achieve 4 000 g in 290 d. Mating and breeding occurred throughout the year although evidence for the seasonal migration of females is presented and discussed in relation to breeding and feeding behaviour.
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  • 73
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    In:  Zentralblatt für Bakteriologie Mikrobiologie und Hygiene: I. Abt. Originale C: Allgemeine, angewandte und ökologische Mikrobiologie, 3 (3). pp. 358-363.
    Publication Date: 2021-04-26
    Description: Menaquinones (vitamin K2) were the only isoprenoid quinones found in the Actinomycetes tested. Thermomonospora strains belonging to the species T. alba, T. curvata and T. fusca contained very complex mixtures of menaquinones with nine, ten and eleven isoprene units. Hexa- and octahydrogenated menaquinones with ten isoprene units constituted the major components in T. alba, whereas, octahydrogenated menaquinones with ten isoprene units predominated in T. curvata and T. fusca. Substantial amounts of hitherto undescribed hexa-, octa-, and decahydrogenated menaquinones with eleven isoprene units were also present in the three species. The representative of the taxon Thermomonospora (Actinobifida) chromogena examined differed in possessing major amounts of tetrahydrogenated menaquinones with only nine isoprene units; a pattern also found in Saccharomonospora viridis, Actinomadura flexuosa and Micromonospora halophytica subsp. halophytica. The chemotaxonomic data and supporting results of numerical taxonomic studies suggest that Actinobifida chromogena may have been wrongly classified in the genus Thermomonospora.
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  • 74
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    In:  Journal of Materials Science, 18 (7). pp. 2081-2086.
    Publication Date: 2021-08-02
    Description: The internal shell of the cuttlefish, which acts as a rigid buoyancy tank, is structured to combine high compressive strength — since it must withstand the external hydrostatic pressure — with minimum weighT. The micro-architecture of cuttlebone has been examined by electron microscopy and the relevance of the structure to the mechanical duties required of the shellin vivo are briefly discussed. The inorganic calcareous structure is associated with an organic component which may act as a template for mineralization.
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  • 75
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    In:  In: Progress in phycological research. Progress in phycological research, 2 . Elsevier, Amsterdam, pp. 333-386. ISBN 0-44480502-8
    Publication Date: 2018-10-12
    Type: Book chapter , NonPeerReviewed
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  • 76
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    In:  Geochimica et Cosmochimica Acta, 45 (4). pp. 577-588.
    Publication Date: 2016-03-01
    Description: Generally, oxidative regeneration of phosphate from anoxic sediments is by microbially mediated sulfate reduction processes. Stoichiometric modelling of such reactions takes into consideration varying proportions of ‘decomposable’ organically bound P to account for the ratios among nutrients in depth-concentration profiles of near-surface sediments. New results of interstitial water composition from sediments underlying the water masses influenced by coastal upwelling of the eastern boundary current system off Peru indicate that dissolution of phosphatic fish debris represents a mechanism for remineralization of phosphate comparable to or larger in magnitude than that by oxidative regeneration of organically bound P. Dissolved interstitial phosphate from fish debris is revealed by an excess amount of phosphate over that predicted from a simple stoichiometric oxidative regeneration model and by anomalously high dissolved interstitial fluoride concentrations. Phosphate flux estimates based on diffusion from the sediment suggest that this mechanism may generate up to 10% of the nutrient pool in the waters of the Peru undercurrent. Partitioning of P among the two sources reveals further that fish debris phosphate is about four times more important than organically bound P in nutrient generation from sediments of the Peru continental margin. Not only does this mechanism of regeneration affect the nutrient cycling but may also control widespread phosphorite formation in this area.
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  • 77
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    In:  International Review of Cytology, 67 . pp. 171-214.
    Publication Date: 2018-10-29
    Description: This chapter discusses coral skeletogenesis, focusing on the morphology of the skeletogenic tissues. It reviews the light and electron microscope studies carried out in this regard, illustrating the example of the morphology of the skeletogenic tissues of the coral Pocillopora damicornis. A structural organic matrix is present in the adult skeleton of Pocillopora damicornis. One component of this structural matrix is present transiently at the growth surface of the skeleton. It consists of individual sheaths enveloping each forming aragonite crystal. These crystal sheaths, plus some small extracellular vesicles that are presumed to represent a precursor for the sheaths, are together implicated in the hypotheses for coral calcification. The hypotheses fall into the following three broad categories: (1) algal removal of possible inhibitory substances; (2) a general stimulatory effect of algal metabolism; and (3) algal contribution to a skeletal organic matrix.
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  • 78
    Publication Date: 2018-07-25
    Description: Investigations of formation-fluid salinities in a transect from western Georgia to the edge of the Blake Plateau off the coast of Georgia show surprisingly similar hydrochemical features offshore and onshore. A fresh-brackish wedge of groundwater (〈25 g/kg total dissolved solids) lies beneath the shelf to a depth of ∼ 900 m. On land, brackish waters extend to a maximum depth of ∼ 1.2 km below sea level in Lowndes County, Georgia. In deeper horizons, hypersaline brines (〉 100 g/kg) occur in Lower Cretaceous (?) strata. These strata have a pronounced evaporitic (anhydritic) character in the offshore segment. Strong salinity gradients in interstitial waters signify buried evaporite deposits at drill sites beneath the Blake Plateau.
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  • 79
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    In:  Journal of Experimental Marine Biology and Ecology, 69 . pp. 129-136.
    Publication Date: 2021-01-19
    Description: Observations on undisturbed, individually isolated, Octopus vulgaris show that ventilation rate is strongly related to "arousal" or activation. Ventilation rate may be recorded visually by a screened observer or remotely, using carbon electrodes connected to a pen recorder via an impedance coupler to register the associated water movements in a small experimental chamber. The method allows a quantifiable behavioural characteristic to be measured objectively. It has been used to demonstrate that O. vulgaris responds to certain chemical stimuli in flowing sea water with a sharply increased ventilation rate. This result is taken to show distance chemoreception in this cephalopod.
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