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Charcoal records of two sediment cores off SW Africa (2012)

Daniau, Anne-Laure ; Bartlein, Patrick J ; Harrison, S P ; [weitere]

PANGAEA

In: Supplement to: Daniau, Anne-Laure; Bartlein, Patrick J; Harrison, S P; Prentice, Iain Colin; Brewer, Simon; Friedlingstein, Pierre; Harrison-Prentice, T I; Inoue, J; Izumi, K; Marlon, Jennifer R; Mooney, Scott D; Power, Mitchell J; Stevenson, J; Tinner, Willy; Andric, M; Atanassova, J; Behling, Hermann; Black, M; Blarquez, O; Brown, K J; Carcaillet, C; Colhoun, Eric A; Colombaroli, Daniele; Davis, Basil A S; D'Costa, D; Dodson, John; Dupont, Lydie M; Eshetu, Z; Gavin, D G; Genries, A; Haberle, Simon G; Hallett, D J; Hope, Geoffrey; Horn, S P; Kassa, T G; Katamura, F; Kennedy, L M; Kershaw, A Peter; Krivonogov, S; Long, C; Magri, Donatella; Marinova, E; McKenzie, G Merna; Moreno, P I; Moss, Patrick T; Neumann, F H; Norstrom, E; Paitre, C; Rius, D; Roberts, Neil; Robinson, G S; Sasaki, N; Scott, Louis; Takahara, H; Terwilliger, V; Thevenon, Florian; Turner, R; Valsecchi, V G; Vannière, Boris; Walsh, M; Williams, N; Zhang, Yancheng (2012): Predictability of biomass burning in response to climate changes. Global Biogeochemical Cycles, 26(4), https://doi.org/10.1029/2011GB004249

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Publikationsdatum: 2024-01-13

Beschreibung: We analyze sedimentary charcoal records to show that the changes in fire regime over the past 21,000 yrs are predictable from changes in regional climates. Analyses of paleo- fire data show that fire increases monotonically with changes in temperature and peaks at intermediate moisture levels, and that temperature is quantitatively the most important driver of changes in biomass burning over the past 21,000 yrs. Given that a similar relationship between climate drivers and fire emerges from analyses of the interannual variability in biomass burning shown by remote-sensing observations of month-by-month burnt area between 1996 and 2008, our results signal a serious cause for concern in the face of continuing global warming.

Schlagwort(e): Center for Marine Environmental Sciences; MARUM

Materialart: Dataset

Format: application/zip, 2 datasets

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Analysis of biogenic magnetite nanoparticles (2013)

Byrne, James M ; Coker, V S ; Moise, S ; [weitere]

PANGAEA

In: Supplement to: Byrne, James M; Coker, V S; Moise, S; Wincott, P L; Vaughan, D J; Tuna, F; Arenholz, E; van der Laan, G; Pattrick, R A D P; Lloyd, J R; Telling, N D (2013): Controlled cobalt doping in biogenic magnetite nanoparticles. Journal of The Royal Society Interface, 10(83), 20130134-20130134, https://doi.org/10.1098/rsif.2013.0134

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Publikationsdatum: 2023-01-13

Beschreibung: Cobalt doped magnetite (CoxFe3-xO4) nanoparticles have been produced through the microbial reduction of cobalt-iron oxyhydroxide by the bacterium Geobacter sulfurreducens. The materials produced, as measured by SQUID, x-ray magnetic circular dichroism, Mössbauer spectroscopy, etc., show dramatic increases in coercivity with increasing cobalt content without a major decrease in overall saturation magnetization. Structural and magnetization analyses reveal a reduction in particle size to 〈4 nm at the highest Co content, combined with an increase in the effective anisotropy of the magnetic nanoparticles. The potential use of these biogenic nanoparticles in aqueous suspensions for magnetic hyperthermia applications is demonstrated. Further analysis of the distribution of cations within the ferrite spinel indicates that the cobalt is predominantly incorporated in octahedral coordination, achieved by the substitution of Fe2+ site with Co2+, with up to 17 per cent Co substituted into tetrahedral sites.

Materialart: Dataset

Format: application/zip, 695.2 kBytes

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Annotated record of the detailed examination of Mn deposits from DSDP Leg 26 (Sites 250A, 252, 256, 257) (1974)

Davies, Thomas A ; Luyendyk, Bruce P ; Rodolfo, Kelvin S ; [weitere]

PANGAEA

In: Supplement to: Doyle, Patricia S; Boltovskoy, Esteban; Herb, Rene C; Thierstein, Hans R; Hyndman, Roy D; Horvath, George J; Leidy, Rosanne D; McKelvey, Barrie C; Kempe, D R C; Rodolfo, Kelvin S; Davies, Thomas A; Luyendyk, Bruce P (1974): Initial Reports of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project, U.S. Government Printing Office, XXVI, 1129 pp, https://doi.org/10.2973/dsdp.proc.26.1974

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Publikationsdatum: 2023-08-28

Beschreibung: DSDP Leg 26, is the fifth cruise of D/V Glomar Challenger in the Indian Ocean, and the first cruise of Phase III of the Deep Sea Drilling Project. The Indian Ocean is the smallest of the three major ocean basins but appears to be geologically the most complex. The sites drilled on Leg 26 were selected to try to elucidate a number of specific problems of both local and broad regional significance, as well as to add to the general knowledge of the area. In particular: a) To locate the oldest sediment in the Indian Ocean and thus possibly the date of the initial breakup of Gondwanaland (Sites 250, 256, 257); b) To determine the effects of the initiation of the Circumpolar Current on southern Indian Ocean sedimentation (Sites 250, 252, 256, 257, 258); c) To determine the history of spreading of the Southwest Branch of the Indian Ocean Ridge and the history of the crust and oceanic sedimentation in that general region (Sites 250, 251, 252).

Schlagwort(e): 26-250A; 26-252; 26-256; 26-257; Comment; Deep Sea Drilling Project; Deposit type; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; Event label; Glomar Challenger; Identification; Indian Ocean//BASIN; Leg26; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Quantity of deposit; Sample code/label; Sediment type; Size; Visual description

Materialart: Dataset

Format: text/tab-separated-values, 42 data points

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Observation of manganese deposits on the East Pacific Rise during the CYAMEX-RITA expedition (1981)

Cyamex Scientific Team ; Francheteau, Jean ; Needham, H D ; [weitere]

PANGAEA

In: Supplement to: Cyamex Scientific Team; Francheteau, Jean; Needham, H D; Choukroune, P; Juteau, Thierry; Séguret, Marie J M; Ballard, R D; Fox, P J; Normark, William R; Carranza, A; Cordoba, D; Guerrero, Gerardo; Rangin, Claude (1981): First manned submersible dives on the East Pacific Rise at 21�N (project RITA): General results. Marine Geophysical Research, 4(4), 345-379, https://doi.org/10.1007/BF00286034

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Publikationsdatum: 2023-08-28

Beschreibung: A submersible study has been conducted in February - March 1978 at the axis of the East Pacific Rise near 21°N. The expedition CYAMEX, the first submersible program to be conducted on the East Pacific Rise, is part of the French-American-Mexican project RITA (Rivera - Tamayo), a 3-year study devoted to detailed geological and geophysical investigations of the East Pacific Rise Crest. On the basis of the 15 dives made by CYANA in the axial area of the Rise, a morphological and tectonic zonation can be established for this moderately-fast spreading center. A narrow, 0.6 to 1.2 km wide zone of extrusion (zone 1), dominated by young lava flows, is flanked by a highly fissured and faulted zone of extension (zone 2) with a width of 1 to 2 km. Further out, zone 3 is dominated by outward tilted blocks bounded by inward-facing fault scarps. Active or recent faults extend up to 12 km from the axis of extrusion of the East Pacific Rise. This represents the first determination from direct field evidence of the width of active tectonism associated with an accreting plate boundary. Massive sulfide deposits, made principally of zinc, copper and iron, were found close to the axis of the Rise. Other signs of the intense hydrothermal activity included the discovery of benthic fauna of giant size similar to that found at the axis of the Galapagos Rift. We emphasize the cyclic character of the volcanicity. The main characteristics of the geology of this segment of the East Pacific Rise can be explained by the thermal structure at depth below this moderately-fast spreading center. The geological observations are compatible with the existence of a shallow magma reservoir centered at the axis of the Rise with a half-width of the order of 10 km.

Schlagwort(e): CY78-16DF; CY78-17V; CY78-18V; CYAMEX; Cyana (Submersible); Deposit type; DEPTH, sediment/rock; Description; East Pacific Rise; Event label; Identification; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; OBSE; Observation; Position; Quantity of deposit; Sediment sample; Sediment type; SES; Substrate type; Visual description

Materialart: Dataset

Format: text/tab-separated-values, 21 data points

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Nuclear Magnetic Resonance in Poly(vinyl acetate) (1971)

Hoch, M. J. R. ; Bovey, F. A. ; Davis, D. D. ; [weitere]

s.l. : American Chemical Society

Macromolecules 4 (1971), S. 712-715

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ISSN: 1520-5835

Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/ma60024a008

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Synthesis, x-ray crystallographic determination, and opioid activity of erythro-5-methylmethadone enantiomers. Evidence which suggests that .mu. and .delta. opioid receptors possess different stereochemical requirements (1982)

Portoghese, P. S. ; Poupaert, J. H. ; Larson, D. L. ; [weitere]

s.l. : American Chemical Society

Journal of medicinal chemistry 25 (1982), S. 684-688

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ISSN: 1520-4804

Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/jm00348a015

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Determination of alkaline earth and divalent transition metal cations by ion chromatography with sulfate-supressed barium and lead eluents (1980)

Nordmeyer, F. R. ; Hansen, L. D. ; Eatough, D. J. ; [weitere]

s.l. : American Chemical Society

Analytical chemistry 52 (1980), S. 852-856

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ISSN: 1520-6882

Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/ac50056a019

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The utility of the CS and IOS approximations for calculating generalized phenomenological cross sections in atom-diatom systems (1982)

Fitz, D. E. ; Kouri, D. J. ; Liu, W. K. ; [weitere]

s.l. : American Chemical Society

The @journal of physical chemistry 〈Washington, DC〉 86 (1982), S. 1087-1096

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Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/j100396a008

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Side line indexing for peak search in scanning inductively coupled plasma emission spectrometry (1984)

Nygaard, D. D. ; Chase, D. S. ; Leighty, D. A. ; [weitere]

s.l. : American Chemical Society

Analytical chemistry 56 (1984), S. 424-427

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ISSN: 1520-6882

Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/ac00267a028

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A Phytochemical Screening Procedure for Sweet Ent-Kaurene Glycosides in the Genus Stevia (1984)

Kinghorn, A. D. ; Soejarto, D. D. ; Nanayakkara, N. P. D. ; [weitere]

s.l. : American Chemical Society

Journal of natural products 47 (1984), S. 439-444

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ISSN: 1520-6025

Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/np50033a007

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