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  • Articles  (64,239)
  • Nature Publishing Group  (39,317)
  • American Association for the Advancement of Science  (24,922)
  • American Institute of Physics (AIP)
  • 2020-2023  (26)
  • 1970-1974  (34,611)
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  • 1
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    Nature Publishing Group
    In:  EPIC3Nature Climate Change, Nature Publishing Group, 12(3), pp. 249-255
    Publication Date: 2022-06-20
    Repository Name: EPIC Alfred Wegener Institut
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  • 2
    Publication Date: 2022-09-13
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Liu, C.-Z., Dick, H. J. B., Mitchell, R. N., Wei, W., Zhang, Z.-Y., Hofmann, A. W., Yang, J.-F., & Li, Y. Archean cratonic mantle recycled at a mid-ocean ridge. Science Advances, 8(22), (2022): eabn6749, https://doi.org/10.1126/sciadv.abn6749.
    Description: Basalts and mantle peridotites of mid-ocean ridges are thought to sample Earth’s upper mantle. Osmium isotopes of abyssal peridotites uniquely preserve melt extraction events throughout Earth history, but existing records only indicate ages up to ~2 billion years (Ga) ago. Thus, the memory of the suspected large volumes of mantle lithosphere that existed in Archean time (〉2.5 Ga) has apparently been lost somehow. We report abyssal peridotites with melt-depletion ages up to 2.8 Ga, documented by extremely unradiogenic 187Os/188Os ratios (to as low as 0.1095) and refractory major elements that compositionally resemble the deep keels of Archean cratons. These oceanic rocks were thus derived from the once-extensive Archean continental keels that have been dislodged and recycled back into the mantle, the feasibility of which we confirm with numerical modeling. This unexpected connection between young oceanic and ancient continental lithosphere indicates an underappreciated degree of compositional recycling over time.
    Description: This study was financially supported by the National Science Fund for Distinguished Young Scholars 42025201 (to C.-Z.L.), the National Key Research and Development Project of China 2020YFA0714801 (to C.-Z.L.), the Strategic Priority Research Program of the Chinese Academy of Sciences XDA13010106 (to C.-Z.L.), the Strategic Priority Research Program of the Chinese Academy of Sciences XDB42020301 (to C.-Z.L.), and NSF grants 2114652 and 1657983 (to H.J.B.D.).
    Repository Name: Woods Hole Open Access Server
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  • 3
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Zhang, Y., Gazel, E., Gaetani, G. A., & Klein, F. Serpentinite-derived slab fluids control the oxidation state of the subarc mantle. Science Advances, 7(48), (2021): eabj2515, https://doi.org/10.1126/sciadv.abj2515.
    Description: Recent geochemical evidence confirms the oxidized nature of arc magmas, but the underlying processes that regulate the redox state of the subarc mantle remain yet to be determined. We established a link between deep subduction-related fluids derived from dehydration of serpentinite ± altered oceanic crust (AOC) using B isotopes and B/Nb as fluid proxies, and the oxidized nature of arc magmas as indicated by Cu enrichment during magma evolution and V/Yb. Our results suggest that arc magmas derived from source regions influenced by a greater serpentinite (±AOC) fluid component record higher oxygen fugacity. The incorporation of this component into the subarc mantle is controlled by the subduction system’s thermodynamic conditions and geometry. Our results suggest that the redox state of the subarc mantle is not homogeneous globally: Primitive arc magmas associated with flat, warm subduction are less oxidized overall than those generated in steep, cold subduction zones.
    Description: Y.Z. acknowledges funding from the National Science Foundation of China (91958213), the Chinese Academy of Sciences (XDB42020402), and the Shandong Provincial Natural Science Foundation, China (ZR2020QD068). This study was supported in part by the U.S. National Science Foundation NSF EAR 1826673 to E.G. and G.A.G. and OCE 1756349 to E.G.
    Repository Name: Woods Hole Open Access Server
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  • 4
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    American Association for the Advancement of Science
    Publication Date: 2022-06-09
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Freeman, D. H., & Ward, C. P. Sunlight-driven dissolution is a major fate of oil at sea. Science Advances, 8(7), (2022): eabl7605, https://doi.org/10.1126/sciadv.abl7605.
    Description: Oxygenation reactions initiated by sunlight can transform insoluble components of crude oil at sea into water-soluble products, a process called photo-dissolution. First reported a half century ago, photo-dissolution has never been included in spill models because key parameters required for rate modeling were unknown, including the wavelength and photon dose dependence. Here, we experimentally quantified photo-dissolution as a function of wavelength and photon dose, making possible a sensitivity analysis of environmental variables in hypothetical spill scenarios and a mass balance assessment for the 2010 Deepwater Horizon (DwH) spill. The sensitivity analysis revealed that rates were most sensitive to oil slick thickness, season/latitude, and wavelength and less sensitive to photon dose. We estimate that 3 to 17% (best estimate 8%) of DwH surface oil was subject to photo-dissolution, comparable in magnitude to other widely recognized fate processes. Our findings invite a critical reevaluation of surface oil budgets for both DwH and future spills at sea.
    Description: This work was supported by the Fisheries and Oceans Canada Multi-Partner Research Initiative award to C.P.W. (project #1.06), the NSF Graduate Research Fellowship awarded to D.H.F. (award #174530), and NSF-OCE grant #1841092 to C.P.W.
    Repository Name: Woods Hole Open Access Server
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  • 5
    Publication Date: 2022-08-11
    Description: The methanogenic degradation of oil hydrocarbons can proceed through syntrophic partnerships of hydrocarbon-degrading bacteria and methanogenic archaea1,2,3. However, recent culture-independent studies have suggested that the archaeon ‘Candidatus Methanoliparum’ alone can combine the degradation of long-chain alkanes with methanogenesis4,5. Here we cultured Ca. Methanoliparum from a subsurface oil reservoir. Molecular analyses revealed that Ca. Methanoliparum contains and overexpresses genes encoding alkyl-coenzyme M reductases and methyl-coenzyme M reductases, the marker genes for archaeal multicarbon alkane and methane metabolism. Incubation experiments with different substrates and mass spectrometric detection of coenzyme-M-bound intermediates confirm that Ca. Methanoliparum thrives not only on a variety of long-chain alkanes, but also on n-alkylcyclohexanes and n-alkylbenzenes with long n-alkyl (C≥13) moieties. By contrast, short-chain alkanes (such as ethane to octane) or aromatics with short alkyl chains (C≤12) were not consumed. The wide distribution of Ca. Methanoliparum4,5,6 in oil-rich environments indicates that this alkylotrophic methanogen may have a crucial role in the transformation of hydrocarbons into methane.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
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  • 6
    Publication Date: 2022-07-25
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Peng, Q., Xie, S.-P., Wang, D., Huang, R. X., Chen, G., Shu, Y., Shi, J.-R., & Liu, W. Surface warming-induced global acceleration of upper ocean currents. Science Advances, 8(16), (2022): eabj8394, https://doi.org/10.1126/sciadv.abj8394.
    Description: How the ocean circulation changes in a warming climate is an important but poorly understood problem. Using a global ocean model, we decompose the problem into distinct responses to changes in sea surface temperature, salinity, and wind. Our results show that the surface warming effect, a robust feature of anthropogenic climate change, dominates and accelerates the upper ocean currents in 77% of the global ocean. Specifically, the increased vertical stratification intensifies the upper subtropical gyres and equatorial currents by shoaling these systems, while the differential warming between the Southern Ocean upwelling zone and the region to the north accelerates surface zonal currents in the Southern Ocean. In comparison, the wind stress and surface salinity changes affect regional current systems. Our study points a way forward for investigating ocean circulation change and evaluating the uncertainty.
    Description: Q.P. is supported by the National Natural Science Foundation of China (42005035), the Science and Technology Planning Project of Guangzhou (202102020935), and the Independent Research Project Program of State Key Laboratory of Tropical Oceanography (LTOZZ2102). D.W. is supported by the National Natural Science Foundation of China (92158204), and the Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) (311020004). S.-P.X. is supported by the National Science Foundation (AGS-1934392). Y.S. is supported by the National Key Research and Development Program of China (2016YFC1401702). G.C. is supported by National Natural Science Foundation of China (41822602). The numerical simulation is supported by the High-Performance Computing Division and HPC managers of W. Zhou and D. Sui in the South China Sea Institute of Oceanology.
    Repository Name: Woods Hole Open Access Server
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  • 7
    Publication Date: 2022-10-31
    Description: The statistical properties of seismicity are known to be affected by several factors such as the rheological parameters of rocks. We analysed the earthquake double-couple as a function of the faulting type. Here we show that it impacts the moment tensors of earthquakes: thrust- faulting events are characterized by higher double-couple components with respect to strike- slip- and normal-faulting earthquakes. Our results are coherent with the stress dependence of the scaling exponent of the Gutenberg-Richter law, which is anticorrelated to the double- couple. We suggest that the structural and tectonic control of seismicity may have its origin in the complexity of the seismogenic source marked by the width of the cataclastic damage zone and by the slip of different fault planes during the same seismic event; the sharper and concentrated the slip as along faults, the higher the double-couple. This phenomenon may introduce bias in magnitude estimation, with possible impact on seismic forecasting.
    Description: Published
    Description: 258
    Description: 2T. Deformazione crostale attiva
    Description: JCR Journal
    Keywords: double couple ; damage zone ; different fault type ; seismicity ; tectonics ; fault type ; seismicity ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 8
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Gomaa, F., Utter, D. R., Powers, C., Beaudoin, D. J., Edgcomb, V. P., Filipsson, H. L., Hansel, C. M., Wankel, S. D., Zhang, Y., & Bernhard, J. M. Multiple integrated metabolic strategies allow foraminiferan protists to thrive in anoxic marine sediments. Science Advances, 7(22), (2021): eabf1586, https://doi.org/10.1126/sciadv.abf1586.
    Description: Oceanic deoxygenation is increasingly affecting marine ecosystems; many taxa will be severely challenged, yet certain nominally aerobic foraminifera (rhizarian protists) thrive in oxygen-depleted to anoxic, sometimes sulfidic, sediments uninhabitable to most eukaryotes. Gene expression analyses of foraminifera common to severely hypoxic or anoxic sediments identified metabolic strategies used by this abundant taxon. In field-collected and laboratory-incubated samples, foraminifera expressed denitrification genes regardless of oxygen regime with a putative nitric oxide dismutase, a characteristic enzyme of oxygenic denitrification. A pyruvate:ferredoxin oxidoreductase was highly expressed, indicating the capability for anaerobic energy generation during exposure to hypoxia and anoxia. Near-complete expression of a diatom’s plastid genome in one foraminiferal species suggests kleptoplasty or sequestration of functional plastids, conferring a metabolic advantage despite the host living far below the euphotic zone. Through a unique integration of functions largely unrecognized among “typical” eukaryotes, benthic foraminifera represent winning microeukaryotes in the face of ongoing oceanic deoxygenation.
    Description: his project was funded by the U.S. NSF IOS 1557430 and 1557566. H.L.F. acknowledges support from the Swedish Research Council VR (grant number 2017-04190).
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  • 9
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Le Roux, V., Urann, B. M., Brunelli, D., Bonatti, E., Cipriani, A., Demouchy, S., & Monteleone, B. D. Postmelting hydrogen enrichment in the oceanic lithosphere. Science Advances, 7(24), (2021): eabf6071, https://doi.org/10.1126/sciadv.abf6071.
    Description: The large range of H2O contents recorded in minerals from exhumed mantle rocks has been challenging to interpret, as it often records a combination of melting, metasomatism, and diffusional processes in spatially isolated samples. Here, we determine the temporal variations of H2O contents in pyroxenes from a 24-Ma time series of abyssal peridotites exposed along the Vema fracture zone (Atlantic Ocean). The H2O contents of pyroxenes correlate with both crustal ages and pyroxene chemistry and increase toward younger and more refractory peridotites. These variations are inconsistent with residual values after melting and opposite to trends often observed in mantle xenoliths. Postmelting hydrogen enrichment occurred by ionic diffusion during cryptic metasomatism of peridotite residues by low-degree, volatile-rich melts and was particularly effective in the most depleted peridotites. The presence of hydrous melts under ridges leads to widespread hydrogen incorporation in the oceanic lithosphere, likely lowering mantle viscosity compared to dry models.
    Description: Funding for this study was supported by NSF EAR-P&G 1524311 and 1839128 to V.L.R. and the Andrew W. Mellon Foundation Award for Innovative Research to V.L.R. A.C. and D.B. were funded by the Italian Programma di Rilevante Interesse Nazionale PRIN 20178LPCPW and PRIN2017KY5ZX8, respectively. Revisions were performed within the duration of a “Visiting Scholar at SCIENCE 2020” award to V.L.R. (University of Copenhagen, Denmark), with support from the Department of Geosciences and Natural Resource Management, Section for Geology.
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  • 10
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Clemens, S. C., Yamamoto, M., Thirumalai, K., Giosan, L., Richey, J. N., Nilsson-Kerr, K., Rosenthal, Y., Anand, P., & McGrath, S. M. Remote and local drivers of Pleistocene South Asian summer monsoon precipitation: a test for future predictions. Science Advances, 7(23), (2021): eabg3848, https://doi.org/10.1126/sciadv.abg3848.
    Description: South Asian precipitation amount and extreme variability are predicted to increase due to thermodynamic effects of increased 21st-century greenhouse gases, accompanied by an increased supply of moisture from the southern hemisphere Indian Ocean. We reconstructed South Asian summer monsoon precipitation and runoff into the Bay of Bengal to assess the extent to which these factors also operated in the Pleistocene, a time of large-scale natural changes in carbon dioxide and ice volume. South Asian precipitation and runoff are strongly coherent with, and lag, atmospheric carbon dioxide changes at Earth’s orbital eccentricity, obliquity, and precession bands and are closely tied to cross-equatorial wind strength at the precession band. We find that the projected monsoon response to ongoing, rapid high-latitude ice melt and rising carbon dioxide levels is fully consistent with dynamics of the past 0.9 million years.
    Description: S.C.C. and S.M.M. were supported by U.S. NSF OCE1634774. M.Y. was funded by JSPS grants JPMXS05R2900001 and 19H05595 and JAMSTEC Exp. 353 postcruise study. K.N.-K. and P.A. were supported by UK-IODP, Open University, and NERC (NE/L002493/1), K.T. was supported by the Technology and Research Initiative Fund, Arizona Board of Regents.
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  • 11
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Seltzer, A. M., Bekaert, D. V., Barry, P. H., Durkin, K. E., Mace, E. K., Aalseth, C. E., Zappala, J. C., Mueller, P., Jurgens, B., & Kulongoski, J. T. Groundwater residence time estimates obscured by anthropogenic carbonate. Science Advances, 7(17), (2021): eabf3503, https://doi.org/10.1126/sciadv.abf3503.
    Description: Groundwater is an important source of drinking and irrigation water. Dating groundwater informs its vulnerability to contamination and aids in calibrating flow models. Here, we report measurements of multiple age tracers (14C, 3H, 39Ar, and 85Kr) and parameters relevant to dissolved inorganic carbon (DIC) from 17 wells in California’s San Joaquin Valley (SJV), an agricultural region that is heavily reliant on groundwater. We find evidence for a major mid-20th century shift in groundwater DIC input from mostly closed- to mostly open-system carbonate dissolution, which we suggest is driven by input of anthropogenic carbonate soil amendments. Crucially, enhanced open-system dissolution, in which DIC equilibrates with soil CO2, fundamentally affects the initial 14C activity of recently recharged groundwater. Conventional 14C dating of deeper SJV groundwater, assuming an open system, substantially overestimates residence time and thereby underestimates susceptibility to modern contamination. Because carbonate soil amendments are ubiquitous, other groundwater-reliant agricultural regions may be similarly affected.
    Description: his work was conducted as a part of the USGS National Water Quality Assessment Program (NAWQA) Enhanced Trends Project (https://water.usgs.gov/nawqa/studies/gwtrends/). Measurements at Argonne National Laboratory were supported by Department of Energy, Office of Science under contract DE-AC02-06CH11357. Measurements at Pacific Northwest National Laboratory were part of the Ultra-Sensitive Nuclear Measurements Initiative conducted under the Laboratory Directed Research and Development Program. PNNL is operated by Battelle for the U.S. Department of Energy under Contract DE-AC05-76RL01830. This work was also partially supported by NSF award OCE-1923915 (to A.M.S. and P.H.B. at WHOI).
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  • 12
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Trembath-Reichert, E., Shah Walter, S. R., Ortiz, M. A. F., Carter, P. D., Girguis, P. R., & Huber, J. A. Multiple carbon incorporation strategies support microbial survival in cold subseafloor crustal fluids. Science Advances, 7(18), (2021): eabg0153, https://doi.org/10.1126/sciadv.abg0153.
    Description: Biogeochemical processes occurring in fluids that permeate oceanic crust make measurable contributions to the marine carbon cycle, but quantitative assessments of microbial impacts on this vast, subsurface carbon pool are lacking. We provide bulk and single-cell estimates of microbial biomass production from carbon and nitrogen substrates in cool, oxic basement fluids from the western flank of the Mid-Atlantic Ridge. The wide range in carbon and nitrogen incorporation rates indicates a microbial community well poised for dynamic conditions, potentially anabolizing carbon and nitrogen at rates ranging from those observed in subsurface sediments to those found in on-axis hydrothermal vent environments. Bicarbonate incorporation rates were highest where fluids are most isolated from recharging bottom seawater, suggesting that anabolism of inorganic carbon may be a potential strategy for supplementing the ancient and recalcitrant dissolved organic carbon that is prevalent in the globally distributed subseafloor crustal environment.
    Description: The Gordon and Betty Moore Foundation sponsored most of the observatory components at North Pond through grant GBMF1609. This work was supported by the National Science Foundation through grants NSF OCE-1745589, OCE-1635208, and OCE-1062006 to J.A.H. and NSF OCE-1635365 to P.R.G. and S.R.S.W.; NASA Postdoctoral Fellowship with the NASA Astrobiology Institute to E.T.-R.; L’Oréal USA For Women in Science Fellowship to E.T.-R.; and Woods Hole Partnership Education Program, sponsored by the Woods Hole Diversity Initiative to M.A.F.O. The Center for Dark Energy Biosphere Investigations (C-DEBI OCE-0939564) also supported the participation of J.A.H. and P.D.C. This is C-DEBI contribution number 564.
    Repository Name: Woods Hole Open Access Server
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  • 13
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Johnson, A. C., Ostrander, C. M., Romaniello, S. J., Reinhard, C. T., Greaney, A. T., Lyons, T. W., & Anbar, A. D. Reconciling evidence of oxidative weathering and atmospheric anoxia on Archean Earth. Science Advances, 7(40), (2021): eabj0108, https://doi.org/10.1126/sciadv.abj0108.
    Description: Evidence continues to emerge for the production and low-level accumulation of molecular oxygen (O2) at Earth’s surface before the Great Oxidation Event. Quantifying this early O2 has proven difficult. Here, we use the distribution and isotopic composition of molybdenum in the ancient sedimentary record to quantify Archean Mo cycling, which allows us to calculate lower limits for atmospheric O2 partial pressures (PO2) and O2 production fluxes during the Archean. We consider two end-member scenarios. First, if O2 was evenly distributed throughout the atmosphere, then PO2 〉 10–6.9 present atmospheric level was required for large periods of time during the Archean eon. Alternatively, if O2 accumulation was instead spatially restricted (e.g., occurring only near the sites of O2 production), then O2 production fluxes 〉0.01 Tmol O2/year were required. Archean O2 levels were vanishingly low according to our calculations but substantially above those predicted for an abiotic Earth system.
    Description: We would like to thank our funding sources, including FESD “Dynamics of Earth System Oxygenation” (NSF EAR 1338810 to A.D.A.), NASA Earth and Space Science Fellowship awarded to A.C.J. (80NSSC17K0498), NSF EAR PF to A.C.J. (1952809), and WHOI Postdoctoral Fellowship to C.M.O. C.T.R. acknowledges support from the NASA Astrobiology Institute. We also acknowledge support from the Metal Utilization and Selection across Eons (MUSE) Interdisciplinary Consortium for Astrobiology Research, sponsored by the National Aeronautics and Space Administration Science Mission Directorate (19-ICAR19_2-0007).
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  • 14
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Bekaert, D. V., Auro, M., Shollenberger, Q. R., Liu, M.-C., Marschall, H., Burton, K. W., Jacobsen, B., Brennecka, G. A., McPherson, G. J., von Mutius, R., Sarafian, A., & Nielsen, S. G. Fossil records of early solar irradiation and cosmolocation of the CAI factory: a reappraisal. Science Advances, 7(40), (2021): eabg8329, https://doi.org/10.1126/sciadv.abg8329.
    Description: Calcium-aluminum–rich inclusions (CAIs) in meteorites carry crucial information about the environmental conditions of the nascent Solar System prior to planet formation. Based on models of 50V–10Be co-production by in-situ irradiation, CAIs are considered to have formed within ~0.1 AU from the proto-Sun. Here, we present vanadium (V) and strontium (Sr) isotopic co-variations in fine- and coarse-grained CAIs and demonstrate that kinetic isotope effects during partial condensation and evaporation best explain V isotope anomalies previously attributed to solar particle irradiation. We also report initial excesses of 10Be and argue that CV CAIs possess essentially a homogeneous level of 10Be, inherited during their formation. Based on numerical modeling of 50V–10Be co-production by irradiation, we show that CAI formation during protoplanetary disk build-up likely occurred at greater heliocentric distances than previously considered, up to planet-forming regions (~1AU), where solar particle fluxes were sufficiently low to avoid substantial in-situ irradiation of CAIs.
    Description: This study was funded by NASA Emerging Worlds grant NNX16AD36G to S.G.N. and prepared by LLNL under contract DE-AC52-07NA27344 with release number LLNL-JRNL-819045. M.C.L acknowledges the support by the NASA grant 80NSSC20K0759. The UCLA ion microprobe facility is partially supported by a grant from the NSF Instrumentation and Facilities program.
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  • 15
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    American Association for the Advancement of Science
    In:  EPIC3Science, American Association for the Advancement of Science, 371(6531), pp. 811-818
    Publication Date: 2022-10-01
    Description: Geological archives record multiple reversals of Earth's magnetic poles, but the global impacts of these events, if any, remain unclear. Uncertain radiocarbon calibration has limited investigation of the potential effects of the last major magnetic inversion, known as the Laschamps Excursion 41 to 42 thousand years ago (ka). We use ancient New Zealand kauri trees (Agathis australis) to develop a detailed record of atmospheric radiocarbon levels across the Laschamps Excursion. We precisely characterize the geomagnetic reversal and perform global chemistry-climate modeling and detailed radiocarbon dating of paleoenvironmental records to investigate impacts. We find that geomagnetic field minima ~42 ka, in combination with Grand Solar Minima, caused substantial changes in atmospheric ozone concentration and circulation, driving synchronous global climate shifts that caused major environmental changes, extinction events, and transformations in the archaeological record.
    Repository Name: EPIC Alfred Wegener Institut
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  • 16
    Publication Date: 2022-08-15
    Description: Anaerobic oxidation of ammonium (anammox) in oxygen minimum zones (OMZs) is a major pathway of oceanic nitrogen loss. Ammonium released from sinking particles has been suggested to fuel this process. During cruises to the Peruvian OMZ in April–June 2017 we found that anammox rates are strongly correlated with the volume of small particles (128–512 µm), even though anammox bacteria were not directly associated with particles. This suggests that the relationship between anammox rates and particles is related to the ammonium released from particles by remineralization. To investigate this, ammonium release from particles was modelled and theoretical encounters of free-living anammox bacteria with ammonium in the particle boundary layer were calculated. These results indicated that small sinking particles could be responsible for ~75% of ammonium release in anoxic waters and that free-living anammox bacteria frequently encounter ammonium in the vicinity of smaller particles. This indicates a so far underestimated role of abundant, slow-sinking small particles in controlling oceanic nutrient budgets, and furthermore implies that observations of the volume of small particles could be used to estimate N-loss across large areas.
    Repository Name: EPIC Alfred Wegener Institut
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  • 17
    Publication Date: 2022-05-26
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in DiBenedetto, M., Qin, Z., & Suckale, J. Crystal aggregates record the pre-eruptive flow field in the volcanic conduit at Kilauea, Hawaii. Science Advances, 6(49), (2020): eabd4850, doi:10.1126/sciadv.abd4850.
    Description: Developing reliable, quantitative conduit models that capture the physical processes governing eruptions is hindered by our inability to observe conduit flow directly. The closest we get to direct evidence is testimony imprinted on individual crystals or bubbles in the conduit and preserved by quenching during the eruption. For example, small crystal aggregates in products of the 1959 eruption of Kīlauea Iki, Hawaii contain overgrown olivines separated by large, hydrodynamically unfavorable angles. The common occurrence of these aggregates calls for a flow mechanism that creates this crystal misorientation. Here, we show that the observed aggregates are the result of exposure to a steady wave field in the conduit through a customized, process-based model at the scale of individual crystals. We use this model to infer quantitative attributes of the flow at the time of aggregate formation; notably, the formation of misoriented aggregates is only reproduced in bidirectional, not unidirectional, conduit flow.
    Description: M.D. acknowledges support the Stanford Gerald J. Lieberman Fellowship and the Postdoctoral Scholarship from Woods Hole Oceanographic Institution.
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  • 18
    Publication Date: 2022-05-26
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Torres, J. P., Lin, Z., Watkins, M., Salcedo, P. F., Baskin, R. P., Elhabian, S., Safavi-Hemami, H., Taylor, D., Tun, J., Concepcion, G. P., Saguil, N., Yanagihara, A. A., Fang, Y., McArthur, J. R., Tae, H. S., Finol-Urdaneta, R. K., Özpolat, B. D., Olivera, B. M., & Schmidt, E. W. Small-molecule mimicry hunting strategy in the imperial cone snail, Conus imperialis. Science Advances, 7(11), (2021): eabf2704, https://doi.org/10.1126/sciadv.abf2704.
    Description: Venomous animals hunt using bioactive peptides, but relatively little is known about venom small molecules and the resulting complex hunting behaviors. Here, we explored the specialized metabolites from the venom of the worm-hunting cone snail, Conus imperialis. Using the model polychaete worm Platynereis dumerilii, we demonstrate that C. imperialis venom contains small molecules that mimic natural polychaete mating pheromones, evoking the mating phenotype in worms. The specialized metabolites from different cone snails are species-specific and structurally diverse, suggesting that the cones may adopt many different prey-hunting strategies enabled by small molecules. Predators sometimes attract prey using the prey’s own pheromones, in a strategy known as aggressive mimicry. Instead, C. imperialis uses metabolically stable mimics of those pheromones, indicating that, in biological mimicry, even the molecules themselves may be disguised, providing a twist on fake news in chemical ecology.
    Description: Research reported in this publication was supported by NIH R35GM12252, with contributions to biological work from NIH Fogarty International Center U19TW008163, NIH P01GM48677, and DOD CDMRP W81XWH-17-1-0413. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH.
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  • 19
    Publication Date: 2022-05-26
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Guillermic, M., Cameron, L. P., De Corte, I., Misra, S., Bijma, J., de Beer, D., Reymond, C. E., Westphal, H., Ries, J. B., & Eagle, R. A. Thermal stress reduces pocilloporid coral resilience to ocean acidification by impairing control over calcifying fluid chemistry. Science Advances, 7(2), (2021): eaba9958, https://doi.org/10.1126/sciadv.aba9958.
    Description: The combination of thermal stress and ocean acidification (OA) can more negatively affect coral calcification than an individual stressors, but the mechanism behind this interaction is unknown. We used two independent methods (microelectrode and boron geochemistry) to measure calcifying fluid pH (pHcf) and carbonate chemistry of the corals Pocillopora damicornis and Stylophora pistillata grown under various temperature and pCO2 conditions. Although these approaches demonstrate that they record pHcf over different time scales, they reveal that both species can cope with OA under optimal temperatures (28°C) by elevating pHcf and aragonite saturation state (Ωcf) in support of calcification. At 31°C, neither species elevated these parameters as they did at 28°C and, likewise, could not maintain substantially positive calcification rates under any pH treatment. These results reveal a previously uncharacterized influence of temperature on coral pHcf regulation—the apparent mechanism behind the negative interaction between thermal stress and OA on coral calcification.
    Description: R.A.E. and J.B.R. acknowledge support from National Science Foundation grants OCE-1437166 and OCE-1437371. The work was also supported by the “Laboratoire d’Excellence” LabexMER (ANR-10-LABX-19), cofunded by a grant from the French government under the program “Investissements d’Avenir,” and an IAGC student grant 2017. R.A.E. acknowledges financial and logistical support from the Pritzker Endowment to UCLA IoES, and J.B.R. acknowledges support from the ZMT and the Hanse-Wissenschaftskolleg Fellowship Program and the NSF OCE award #1437371.
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  • 20
    Publication Date: 2022-05-26
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Skinner, C., Mill, A. C., Fox, M. D., Newman, S. P., Zhu, Y., Kuhl, A., & Polunin, N. V. C. Offshore pelagic subsidies dominate carbon inputs to coral reef predators. Science Advances, 7(8), (2021): eabf3792, https://doi.org/10.1126/sciadv.abf3792.
    Description: Coral reefs were traditionally perceived as productive hot spots in oligotrophic waters. While modern evidence indicates that many coral reef food webs are heavily subsidized by planktonic production, the pathways through which this occurs remain unresolved. We used the analytical power of carbon isotope analysis of essential amino acids to distinguish between alternative carbon pathways supporting four key reef predators across an oceanic atoll. This technique separates benthic versus planktonic inputs, further identifying two distinct planktonic pathways (nearshore reef-associated plankton and offshore pelagic plankton), and revealing that these reef predators are overwhelmingly sustained by offshore pelagic sources rather than by reef sources (including reef-associated plankton). Notably, pelagic reliance did not vary between species or reef habitats, emphasizing that allochthonous energetic subsidies may have system-wide importance. These results help explain how coral reefs maintain exceptional productivity in apparently nutrient-poor tropical settings, but also emphasize their susceptibility to future ocean productivity fluctuations.
    Description: Sample analysis funding was provided by NERC LSMSF grant BRIS/102/0717 and BRIS/125/1418. C.S. was supported by a Newcastle University SAgE DTA studentship and a cooperative agreement with Banyan Tree.
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  • 21
    Publication Date: 2022-05-25
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Sadai, S., Condron, A., DeConto, R., & Pollard, D. Future climate response to Antarctic Ice Sheet melt caused by anthropogenic warming. Science Advances, 6(39), (2020): eaaz1169, doi:10.1126/sciadv.aaz1169.
    Description: Meltwater and ice discharge from a retreating Antarctic Ice Sheet could have important impacts on future global climate. Here, we report on multi-century (present–2250) climate simulations performed using a coupled numerical model integrated under future greenhouse-gas emission scenarios IPCC RCP4.5 and RCP8.5, with meltwater and ice discharge provided by a dynamic-thermodynamic ice sheet model. Accounting for Antarctic discharge raises subsurface ocean temperatures by 〉1°C at the ice margin relative to simulations ignoring discharge. In contrast, expanded sea ice and 2° to 10°C cooler surface air and surface ocean temperatures in the Southern Ocean delay the increase of projected global mean anthropogenic warming through 2250. In addition, the projected loss of Arctic winter sea ice and weakening of the Atlantic Meridional Overturning Circulation are delayed by several decades. Our results demonstrate a need to accurately account for meltwater input from ice sheets in order to make confident climate predictions.
    Description: This research was supported by the NSF Office of Polar Programs through NSF grant 1443347, the Biological and Environmental Research (BER) division of the U.S. Department of Energy through grant DE-SC0019263, the NSF through ICER 1664013, and by a grant to the NASA Sea Level Science Team 80NSSC17K0698.
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  • 22
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    American Association for the Advancement of Science
    Publication Date: 2022-05-25
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Foukal, N. P., Gelderloos, R., & Pickart, R. S. A continuous pathway for fresh water along the East Greenland shelf. Science Advances, 6(43), (2020): eabc4254, doi:10.1126/sciadv.abc4254.
    Description: Export from the Arctic and meltwater from the Greenland Ice Sheet together form a southward-flowing coastal current along the East Greenland shelf. This current transports enough fresh water to substantially alter the large-scale circulation of the North Atlantic, yet the coastal current’s origin and fate are poorly known due to our lack of knowledge concerning its north-south connectivity. Here, we demonstrate how the current negotiates the complex topography of Denmark Strait using in situ data and output from an ocean circulation model. We determine that the coastal current north of the strait supplies half of the transport to the coastal current south of the strait, while the other half is sourced from offshore via the shelfbreak jet, with little input from the Greenland Ice Sheet. These results indicate that there is a continuous pathway for Arctic-sourced fresh water along the entire East Greenland shelf from Fram Strait to Cape Farewell.
    Description: Funding for this work comes from the NSF under grant numbers OCE-1756361 and OCE-1558742 (N.P.F. and R.S.P.) and grant numbers OCE-1756863 and OAC-1835640 (R.G.).
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  • 23
    Publication Date: 2022-06-20
    Description: Between 2003-2016, the Greenland ice sheet (GrIS) was one of the largest contributors to sea level rise, as it lost about 255 Gt of ice per year. This mass loss slowed in 2017 and 2018 to about 100 Gt yr−1. Here we examine further changes in rate of GrIS mass loss, by analyzing data from the GRACE-FO (Gravity Recovery and Climate Experiment – Follow On) satellite mission, launched in May 2018. Using simulations with regional climate models we show that the mass losses observed in 2017 and 2018 by the GRACE and GRACE-FO missions are lower than in any other two year period between 2003 and 2019, the combined period of the two missions. We find that this reduced ice loss results from two anomalous cold summers in western Greenland, compounded by snow-rich autumn and winter conditions in the east. For 2019, GRACE-FO reveals a return to high melt rates leading to a mass loss of 223 ± 12 Gt month−1 during the month of July alone, and a record annual mass loss of 532 ± 58 Gt yr−1.
    Repository Name: EPIC Alfred Wegener Institut
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  • 24
    Publication Date: 2022-05-26
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Praetorius, S. K., Condron, A., Mix, A. C., Walczak, M. H., McKay, J. L., & Du, J. The role of northeast pacific meltwater events in deglacial climate change. Science Advances, 6(9), (2020): eaay2915, doi:10.1126/sciadv.aay2915.
    Description: Columbia River megafloods occurred repeatedly during the last deglaciation, but the impacts of this fresh water on Pacific hydrography are largely unknown. To reconstruct changes in ocean circulation during this period, we used a numerical model to simulate the flow trajectory of Columbia River megafloods and compiled records of sea surface temperature, paleo-salinity, and deep-water radiocarbon from marine sediment cores in the Northeast Pacific. The North Pacific sea surface cooled and freshened during the early deglacial (19.0-16.5 ka) and Younger Dryas (12.9-11.7 ka) intervals, coincident with the appearance of subsurface water masses depleted in radiocarbon relative to the sea surface. We infer that Pacific meltwater fluxes contributed to net Northern Hemisphere cooling prior to North Atlantic Heinrich Events, and again during the Younger Dryas stadial. Abrupt warming in the Northeast Pacific similarly contributed to hemispheric warming during the Bølling and Holocene transitions. These findings underscore the importance of changes in North Pacific freshwater fluxes and circulation in deglacial climate events.
    Description: The research was partly supported by the NSF through grants ARC-257 1204045 and PLR-1417667. The numerical model simulations used resources from the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility operated under contract no. DE-AC02-05CH11231.
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  • 25
    Publication Date: 2022-05-26
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Law, K. L., Starr, N., Siegler, T. R., Jambeck, J. R., Mallos, N. J., & Leonard, G. H. The United States' contribution of plastic waste to land and ocean. Science Advances, 6(44), (2020): eabd0288, doi:10.1126/sciadv.abd0288.
    Description: Plastic waste affects environmental quality and ecosystem health. In 2010, an estimated 5 to 13 million metric tons (Mt) of plastic waste entered the ocean from both developing countries with insufficient solid waste infrastructure and high-income countries with very high waste generation. We demonstrate that, in 2016, the United States generated the largest amount of plastic waste of any country in the world (42.0 Mt). Between 0.14 and 0.41 Mt of this waste was illegally dumped in the United States, and 0.15 to 0.99 Mt was inadequately managed in countries that imported materials collected in the United States for recycling. Accounting for these contributions, the amount of plastic waste generated in the United States estimated to enter the coastal environment in 2016 was up to five times larger than that estimated for 2010, rendering the United States’ contribution among the highest in the world.
    Description: This work was funded by Ocean Conservancy through support from the Arthur Vining Davis Foundations.
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  • 26
    Publication Date: 2022-05-26
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Richter, M., Nebel, O., Maas, R., Mather, B., Nebel-Jacobsen, Y., Capitanio, F. A., Dick, H. J. B., & Cawood, P. A. An early cretaceous subduction-modified mantle underneath the ultraslow spreading Gakkel Ridge, Arctic Ocean. Science Advances, 6(44), (2020): eabb4340, doi:10.1126/sciadv.abb4340.
    Description: Earth’s upper mantle, as sampled by mid-ocean ridge basalts (MORBs) at oceanic spreading centers, has developed chemical and isotopic heterogeneity over billions of years through focused melt extraction and re-enrichment by recycled crustal components. Chemical and isotopic heterogeneity of MORB is dwarfed by the large compositional spectrum of lavas at convergent margins, identifying subduction zones as the major site for crustal recycling into and modification of the mantle. The fate of subduction-modified mantle and if this heterogeneity transmits into MORB chemistry remains elusive. Here, we investigate the origin of upper mantle chemical heterogeneity underneath the Western Gakkel Ridge region in the Arctic Ocean through MORB geochemistry and tectonic plate reconstruction. We find that seafloor lavas from the Western Gakkel Ridge region mirror geochemical signatures of an Early Cretaceous, paleo-subduction zone, and conclude that the upper mantle can preserve a long-lived, stationary geochemical memory of past geodynamic processes.
    Description: O.N. was supported by the Australian Research Council (grant FT140101062). P.A.C. was supported by the Australian Research Council (grant FL160100168). H.J.B.D. was supported by the NSF (grants PLR 9912162, PLR 0327591, OCE 0930487, and OCE 1434452). M.R. was supported by a graduate scholarship of Monash University and the SEAE.
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  • 27
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 193-193 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Painted panels from the ceiling of the Natural History Museum, London. According to The British Architect and Northern Engineer of June 1878 "the chief idea . . . . is that of growth". Left to right: Scots pine Pinus sylvestris peach Amygdalus persica cacao Theobroma cacao; English oak Quercus ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 199-202 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sealevel changes over the past 250,000 yr, determined from dated coral reefs on rising islands, are synchronous with precessional changes in solar radiation when orbital eccentricity is large. Oxygen isotope variations in deep-sea cores correspond in timing but not in amplitude, reflecting changing ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 210-212 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Average 'total intensity' profiles measured at 4,830 MHz. Each profile is the sum of two integrations at orthogonal position angles of the feed. At each position angle 500 pulses were superposed. The times are Eastern Australian Standard Time on November 8, 1972. Details of the radio ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 212-214 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We observed every 8-GHz survey source less than 1' in diameter that would not be significantly confused using the 4.7' resolution of the 300-foot telescope at 2.7 GHz. A three-feed system was used to determine declination pointing corrections at every source transit, so that flux densities could be ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 221-222 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The X-ray diffraction photographs of the smectic phases of the two biphenyls are similar and are of a novel type. They both consist of a sharp inner reflection and two diffuse outer reflections as shown in Fig. 1. All smectic phases previously studied have given X-ray diffraction patterns which ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 222-223 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It follows from such a view that even oblique lines ought to be discriminated correctly by young children when the task is a simultaneous discrimination situation. In such a situation the standard is presented together with the choice cards, so that, according to the match?mismatch hypothesis, the ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 226-227 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Polypeptide composition of Fraction I proteins from N. tabacum and the putative progenitor species. Crystalline Fraction I protein was dissolved in 8 M urea-0.5 M Tris-HCl, pH 8.5 and reduced by the addition of dithiothreitol. The protein was S-carboxymethylated by the addition of iodoacetic ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 232-233 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Eight healthy men aged between 24 and 29 yr were recruited. Blood samples were collected at intervals of 10?40 min using an indwelling needle inserted into a forearm vein. The trials lasted 6?7 h starting at about 1700h and only two or three subjects were studied in any one evening. After a meal ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 237-238 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The administration of 14C-labelled L -dopa to normal people is followed by the excretion of sulphoconjugates of dopamine in the urine3 and Parkinson patients on high oral doses of L -dopa have been shown to excrete up to 80% of the amine in this form4?6. It therefore seems that sulphoconjugation ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 238-241 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] 14C-fluphenazine (4-[3-14C-3-(2-trifluoromethyl) phenothiazin-10-yl) propylH-piperazine ethanol, dihydrochloride, 2.4 mCi mol?1) was synthesised by F. Dondzila (Chemical Development Department, Squibb Institute) by first reacting 1-chloropropyl-3-14C-bromide (3 mCi mmol?1, New England Nuclear ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 246-247 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Lymphocytes were purified from defibrinated blood by gelatin sedimentation. Phagocytic cells were removed with iron powder and erythrocytes lysed by 0.83% NH4Cl solution. After washing in saline the lymphocytes were cultured with or without the addition of phytohaemagglutinin (PHA) (Burroughs ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 252-254 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] These early changes in the T-cell functions following ATX have been taken to indicate the existence of a newly formed, shortlived T lymphocyte population in the spleen regulated by the intact thymus either through a continuous cell traffic from the thymus or through the action of a thymic hormone7. ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 257-259 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Isolated cotyledons of fenugreek (Trigonella foenum-graecum L.) respond to cytokinins1 and it has become evident that at an early stage the growth response in darkness is dependent on protein synthesis. It has been shown that cytokinin treatment of cotyledons increases the activity of the ribosome ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 87-87 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE International Centre for Theoretical Physics in Trieste was established in the early sixties in order to provide a base to which young competent theoretical physicists from developing countries could go occasionally for intellectual exchanges and advanced research. An extensive report on the ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 90-90 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] "THE University [of Rhodesia] has been exempted by the British Government and others from sanctions." So runs the last sentence of a sheet describing Salisbury, its university and the chair of biochemistry which was being advertised recently. What does this mean in practice? One of our readers ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 91-91 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE abrupt departure last week of Dr John Sawhill as head of the Federal Energy Administration (FEA) came as no surprise to those who have been keeping track of the jockeying for power and political backstabbing which has characterised energy planning in the United States for the past 18 months. ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 93-93 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR?I was startled to read (Nature, 251, xviii; 1974) that Colorado State University is encouraging 'ethnic minorities and women" to apply for the position of Chairperson in its Statistics Department. I reject as highly improbable the implicit assumption that ethnic minorities necessarily consist ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 94-95 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE Solar System not only contains planets, moons, asteroids, comets, meteorites and meteorids but also a plethora of smaller particles known as miicrometeoroids. These are so small that they do not burn out when they enter the Earth's atmosphere but are gently retarded by momentum transfer to the ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 95-97 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FROM the first description of an induced differential staining of plant chromosomes following cold treatment (Darlington and La Cour, J. Genet., 40, 185; 1940) twenty-eight years were to elapse before Caspersson and his colleagues (Expl Cell Res., 49, 219; 1968) showed that chromosomes treated with ...
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    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 100-100 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SINCE times prehistoric, metallurgists have quenched iron or steel in water to harden them. Nowadays they know that the hardness is linked to the presence of a metastable crystal form, containing more carbon in solution than iron should at ambient temperature. This crystal form, martensite, has ...
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    Nature 252 (1974), S. 110-111 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Distribution of the redshifts of Markaryan galaxies. I present here a preliminary survey of the data which consist of 394 redshifts8?15 (z〈0.08) of which 90, 92, 65, and 147 are for s, sd, ds, and d objects, respectively. The measurements of Ulrich13 and Sargent14 were preferred. The ...
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    Nature 252 (1974), S. 118-119 
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    Notes: [Auszug] Electron stabilisation occurs in deep intermolecular traps (2?3 eV) during low-temperature radiolysis of polar glasses1. After y irradiation, at 77 K, of aqueous alkaline glasses containing efficient electron scavengers (NO2?, NO3?, Fe(CN)63?), a long range electron transfer occurred, apparently by ...
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    Nature 252 (1974), S. 121-123 
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    Notes: [Auszug] Subjects were instructed to utter a given consonant + vowel syllable immediately after listening to repetitions of a selected adapting syllable. The utterances were analysed to determine whether a feature of the waveforms systematically varied as a function of perceptual adaptation. We concentrated ...
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    Nature 252 (1974), S. 129-130 
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    Notes: [Auszug] Aldous Huxley: A Biography Vol. 2: 1939–1963. By Sybille Bedford. Published by Pp. xii + 378 + 15 photographs. (Chatto and Windus, in association with Collins: London, 1974.) £4.50. THE prefix 'para?', says the OED, means "beside, beyond, wrong, irregular". Excellent?just ...
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    Nature 252 (1974), S. 131-131 
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    Notes: [Auszug] Ernst Mach (sporting a splendid moustache) lying on his back and sketching the outside world as it presents itself to his left eye. From Logic, Labels, and Flesh. By Stefan Themerrson. Pp. 202. (Gaberbocchus: London, July 1974.) £3.60 boards; £2.40 ...
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    Nature 252 (1974), S. 134-134 
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    Notes: [Auszug] Hare-headed divinity of ancient Egypt on the coffin of Bakenmut, 21st dynasty. From The Leaping Hare. By G. E. Evans and D. Thomson. Pp. 262 + 24 photographs. (Faber: London, October 1974.) Paper, ...
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    Nature 252 (1974), S. 135-136 
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    Notes: [Auszug] Concepts of Contemporary Astronomy . By Paul W. Hodge. Pp. viii+547. (McGraw-Hill: New York, 1974.) $9.95; £5.45. Fundamental Astronony . By Franklyn W. Cole. Pp. xiiiix+476. (Wiley: New York, 1974.) £5.30. WITH deafening regularity new books on astronomy hit the ...
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    Nature 252 (1974), S. 137-137 
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    Notes: [Auszug] Analytical Methods in Planetary Boundary-Layer Modelling . By R. A. Brown. Pp. xii+148+5 plates. (Adam Hillger: London, June 1974.) £8.00. THE scope of this book is narrower than one might guess from the title. It deals primarily with a restricted topic in the theory of the ...
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    Nature 252 (1974), S. 140-141 
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    Notes: [Auszug] Theoretical Nuclear Physics. Vol. 1: Nuclear Structure . By Amos de Shalit and Herman Feshbach. Pp. xxviii+979. (Wiley: New York and London, June 1974.) £14.60. THE appearance of this volume is a notable event for nuclear physicists and yet another reminder of the loss to the ...
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    Nature 252 (1974), S. 141-142 
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    Notes: [Auszug] The Interpretation of Quantum Mechanics . By Michael Audi. Pp. xiv+200. (University of Chicago: Chicago and London, 1973.) £5.75. THE main purpose of this book is to show that the classical conception of a particle, particularly the attribution of simultaneous position and momentum to ...
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    Nature 252 (1974), S. 142-142 
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    Notes: [Auszug] Internal Rotation in Molecules . Edited by W. J. Orville-Thomas, Pp. xvii+606. (Wiley-Interscience: New York, 1974.) £13.50. THE last thirty years have seen considerable activity in the study of internal rotation and related ring puckering motions in molecules. Orville-Thomas' ...
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    Nature 252 (1974), S. 143-143 
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    Notes: [Auszug] The structure and Biochemistry of Cartilage . By A. Serafini-Fracassini and J. W. Smith. Pp. vii+236. (Churchill Livingston: Edinburgh and London, 1974.) £8.00. THIS book is a very readable account of the biochemistry of connective tissue components, and of the structure and ...
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    Nature 252 (1974), S. 144-144 
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    Notes: [Auszug] Primate Locomotion . Edited by Farish A. Jenkins, jun.. Pp. xii+390. (Academic: New York and London, January 1974.) $34.00; £16.30. THE disadvantages of the current tendency to publish compilations of invited articles on specialised subjects are numerous. Though books of this ...
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    Nature 252 (1974), S. 144-144 
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    Notes: [Auszug] The St Kitts Vervet . By Michael McGuire. (Contributions to Primatology. Vol.1). Pp. xi+202. (S. Karger: Basel, London and New York, 1974.) Sfr 56; £8.10; $17.40. VERVET monkeys were introduced to St Kitts, probably from West Africa, in the latter part of the seventeenth ...
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    Nature 252 (1974), S. 145-145 
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    Notes: [Auszug] Space Radiation Biology and Related Topics . By Tobias and Todd. Pp. xvi+648. (Academic, subsidiary of Harcourt Brace Jovanovich: New York and London, May 1974.) £15.85. IT is perhaps surprising to see the publication of this volume now when support for space research is declining. It ...
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    Nature 252 (1974), S. 146-146 
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    Notes: [Auszug] The shovelnose sturgeon, Scaphirhynchus platorynchus, (above), and the slimy sculpin, Cottus cognatus. From Northern Fishes; third edition. By Samuel Eddy and James C. Underbill. Pp. xix + 414. (University of Minnesota: Minneapolis; Oxford University: London, OctO'ber 1974.) ...
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    Nature 252 (1974), S. 147-147 
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    Notes: [Auszug] Biological Control of Plant Pathogens . By K. F. Baker and R. J. Cook. Pp. xiv+433. (Freeman: San Francisco, 1974.) $12.50. THE authors of this book admit that writing it was a "mind-stretching" exercise; many readers may think that the effort has somewhat distended their subject. ...
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    Nature 252 (1974), S. 147-148 
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    Notes: [Auszug] The Functional Response to Prey Density in an Acarine System. (Simulation Monographs.) By H. G. Fransz. Pp. viii+143. (Centre for Agricultural Publishing and Documentation: Wageningen, 1974.) Dfl.20. DURING the last few years ecological theory seems to have outpaced the collection of ...
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    Nature 252 (1974), S. 148-148 
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    Notes: [Auszug] The Chemistry, Metabolism of Drugs and Toxins: An introduction to Xenobiochemistry . By Michael and Maxine Briggs. Pp. xii+386. (Heinemann Medical: London, June 1974.) £5.00. THIS pot-pourri of data from chemistry, biochemistry, biochemical pharmacology, pharmacology and toxicology is ...
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    Nature 252 (1974), S. 151-153 
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    Notes: [Auszug] Peritoneal macrophages can be maintained in vitro but do not proliferate; they can, however, be induced to synthesise DNA and divide in medium conditioned by cells of the same species12-14. In our system medium conditioned by L cells in logarithmic growth was used and tested on macrophages ...
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    Nature 252 (1974), S. 153-155 
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    Notes: [Auszug] Here we report evidence which suggests that there is a high safety factor in the developmental processes responsible for ensuring orderly synaptic organisation. Despite the cellular disarray in the hippocampus of the homozygous reeler, the resultant synaptic organisation as revealed by ...
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    Nature 252 (1974), S. 156-158 
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    Notes: [Auszug] Recent experimental evidence demonstrates that dibutyryl cyclic AMP can increase the formation of dopamine from labelled tyrosine when incubated with brain slices9 or synaptosomes10,11 prepared from the corpus striatum. We report here, a stimulation of tyrosine hydroxylase activity in rat?brain ...
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    Nature 252 (1974), S. 155-156 
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    Notes: [Auszug] In none of these studies, however, were action potentials recorded with intracellular electrodes in the axon at a large distance from the cell soma. We have been able to record from the axon of the right giant (R2) cell in the visceral ganglion of Aplysia at a distance of 3?4 cm from the soma. Our ...
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    Nature 251 (1974), S. 602-607 
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    Notes: [Auszug] We have investigated the ability of certain people to describe graphical material or remote scenes shielded against ordinary perception. In addition, we performed pilot studies to determine if electroencephalographic (EEG) recordings might indicate perception of remote happenings even in the ...
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    Nature 252 (1974), S. 161-163 
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    Notes: [Auszug] We set out to do this with respect to the membrane associated activities exhibited by many of the enveloped viruses. As the model virus, we used a modification of what has been described as a lipid dispersion, lipid vesicles, or liposomes, that is, single or multiple concentric shells of lipid ...
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    Nature 251 (1974), S. 620-621 
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    Notes: [Auszug] Application of this animal system to the study of human sickle cell anaemia erythroctyes (sickle cells) has verified many of their known survival characteristics in man5-7. These include a short intravascular survival, an improved survival with in vivo hyperoxygenation and an improved survival ...
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    Nature 251 (1974), S. 639-641 
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    Notes: [Auszug] The ultraviolet light technique for mapping transcriptional linkage is based on the observation that certain lesions induced in DNA by ultraviolet light cause premature termination of transcription at the site of the lesion and that no reinitiation occurs beyond the lesion up to the next ...
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    Nature 251 (1974), S. 642-644 
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    Notes: [Auszug] Fig. 1 Effect of interferon on Friend virus synthesis in unstimulated FSD1/F4 cells. Mouse interferon was prepared by the infection of L-929 cells with Newcastle disease virus (NDV-California strain). Cell supernatants were dialysed against 0.1 M glycin?HC1 buffer (pH 2.0) for 5 d and further ...
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    Nature 251 (1974), S. 652-654 
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    Notes: [Auszug] Various means have been devised to prove this point primarily by using high resolution optical devices5 or specific antisera6. Although antisera to IgM immunoglobulins bind specifically to structures on the surface of lymphocytes, in only two cases to our knowledge have IgM immunoglobulins been ...
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    Nature 251 (1974), S. 465-466 
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    Notes: [Auszug] THE action of drugs on cultured vertebrate cells was the subject of the autumn meeting of the British Society for Cell Biology, held at the University of Strathclyde, Glasgow, on September 19 and 20, 1974. Most of the experiments described had one of four main objectsto increase knowledge of the ...
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    Nature 251 (1974), S. 468-468 
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    Notes: [Auszug] Male quagga in Naturhistorisches Museum, Mainz on left; Burchells zebra (type of E. quagga paucistratus) on right. THE quaggy, Equus quagga quagga, no longer roams the Cape Colony having succumbed to the hunters gun in the nineteenth century. The last quagga died in the Amsterdam Zoo in 1883, but ...
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    Nature 251 (1974), S. 473-475 
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    Notes: [Auszug] The Bauer Deep, in the south-eastern equatorial Pacific, is the only deep ocean basin so far known to be characterised by metalliferous sediments throughout the depositional column. The basin was formed when the eastern Pacific spreading centre jumped from the now fossil Galapagos Rise to the newly ...
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    Nature 251 (1974), S. 488-489 
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    Notes: [Auszug] Fig. 1 Results of the solar v experiment, after Evans et al.1. The errors on individual run rates (open circles) quoted for Run 27 come from the present work, the rest from ref. 1. The mean values are those derived by us. Several methods have been adopted to determine the rate R: I, the maximum ...
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    Nature 252 (1974), S. 28-29 
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    Notes: [Auszug] Dziewonski and Gilbert used the 'stacking and stripping' procedure4?6 to construct Fourier transforms of time derivatives of the source time functions. That technique is applicable only at very long periods; as periods become shorter, lateral variations in dispersion become important. Dziewonski ...
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    Nature 252 (1974), S. 29-29 
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    Notes: [Auszug] If g(?) is the Fourier transform of f(t), then g(??) is the Fourier transform of f(? t). If g(?)=g(??) then f(t)= f(? t). If g(?) is an even function of frequency then f(t) is an even function of time. If f(t) is an even function of time it is precursive. The experimental evidence for the isotropic ...
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    Nature 252 (1974), S. 30-31 
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    Notes: [Auszug] Here we correlate spatial variations in compressional velocity with spatial variations in strain over the extended time interval required for the rock to fail under constant stress. A right circular cylinder of Westerly granite was statically loaded in uniaxial compression and velocity observed ...
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    Nature 252 (1974), S. 31-32 
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    Notes: [Auszug] Engel et all concluded that the great majority of rocks from the ocean floor were tholeiitic basalts, and that the occurrence of oceanic alkali basalts was restricted to the tops of volcanic islands and sea mounts This generalisation is 'still largely valid, though, apparently, a greater variety of ...
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    Nature 252 (1974), S. 32-33 
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    Notes: [Auszug] A blue colour develops when sulphur is heated with water and traces of some basic salt2'3. Blue solutions are also formed by sulphur in alkali halide melts4, in liquid potassium thiocyanate above 300 C (refs 5 and 6), by alkali polysulphides in basic solvents7?12, by electrochemical reduction of S8 ...
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    Nature 252 (1974), S. 33-34 
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    Notes: [Auszug] Fig. 1 Birefringence induced in Bentonite sols, at a wavelength of 488 nm. a, Laser-induced birefringence response; b, YAG laser (?=1.06 mm) 'fixed Q' Pulse of approximately 8 kW maximum power; c, electrically induced birefringence response; d, a direct current electric pulse, of amplitude 31 V ...
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    Nature 251 (1974), S. 507-508 
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    Notes: [Auszug] During a study of cuticle sclerotisation I have obtained evidence which confirms an earlier suggestion7 that two mechanisms for forming cross links exist in insect cuticle, one giving a colourless cuticle and the other a dark brown cuticle. Both mechanisms can be active simultaneously in the same ...
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    Nature 252 (1974), S. 35-37 
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    Notes: [Auszug] Here we report preliminary measurements of the K, Rb, Sr, U and Pb concentrations in diamonds. As far as we know the only other reported measurements are by Fesq et al.1 who used instrumental neutron activation analysis to determine the concentrations of Sr, Rb and K. They found that these elements ...
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    Nature 252 (1974), S. 37-38 
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    Notes: [Auszug] The skull is unevenly crushed in the dorsoventral plane and lacks the zygomata and the anterior extremity of the rostrum. Its caudal end is missing, including the greater portion of the petrosals and basioccipital, the occipital condyles and foramen magnum, and the corresponding portions of the ...
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    Nature 252 (1974), S. 38-39 
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    Notes: [Auszug] The mechanism of the myosin ATPase in vertebrate muscle, in which regulation is thin filament-linked, has been widely studied. Myosin rapidly binds and hydrolyses ATP to form a myosin-ADP.P1 intermediate9'10. The breakdown of this complex is the rate limiting step of hydrolysisii and actin ...
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    Nature 252 (1974), S. 40-41 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Deep orange (dor) is an X-linked (1?0.3) recessive mutant of D melanogaster3. In addition to an alteration in pteridine pigments of the eye4, dor causes a peculiar type of sterility3?6. When dor females are mated to dor males, all offspring die during the course of embryonic development. When ...
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    Nature 251 (1974), S. 553-554 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To determine the status of a lymphatic drainage route from the AC, we used a local graft-versus-host lymph node assay. Lymph node cells from Fischer rats specifically sensitised to tissue antigens of DA strain rats were inoculated into either the AC or the subconjunctival space (SCS) of (F x DA)F1 ...
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  • 92
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    [s.l.] : Nature Publishing Group
    Nature 251 (1974), S. 556-556 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] PROFESSOR MATHER?S latest book is a survey of topics in population genetics, intended for advanced undergraduate and postgraduate students seeking a general orientation. The subject is the way in which proportions of genetic types change from generation to generation in response to various factors, ...
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  • 93
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    [s.l.] : Nature Publishing Group
    Nature 251 (1974), S. 557-557 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN recent years, increasing concern at the possible pollution of the environment by chemical pesticides has directed attention back to studies of non-chemical methods of pest control. Before DDT and other efficient synthetic insecticides were brought into general use in the 1940s, control of pests ...
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  • 94
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    [s.l.] : Nature Publishing Group
    Nature 251 (1974), S. 558-558 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the article ?Exchange of neuro-transmitter amino acid at nerve endings can stimulate high affinity uptake? by G. Levi and M. Raiteri (Nature, 250, 735; 1974) the sentence at lines 21?22, p. 737 should read: Net uptake, which may or may not have a high affinity component . . ...
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  • 95
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    [s.l.] : Nature Publishing Group
    Nature 251 (1974), S. 512-513 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] About 20 cm of jejunum from male Wistar rats (200?250 g) was exposed under ether anaesthesia, and the lumen gently rinsed with 10 ml ice cold 0.9%. NaCl. The segment was cannulated and the lumen perfused, in situ (that is, with intact mesentery), with Krebs-Ringer bicarbonate medium, in a gas lift, ...
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  • 96
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    Nature 251 (1974), S. 524-526 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Recently a report5 has suggested that thyrotrophin releasing hormone (TRH) produced a rapid, though transient, improvement in depression when given intravenously. Because the combination of tryptophan plus a monoamine oxidase inhibitor has antidepressant properties6 and because reserpine7 and ...
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  • 97
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    [s.l.] : Nature Publishing Group
    Nature 251 (1974), S. 530-531 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In our preliminary experiments, 15 brain nuclei were dissected and assayed for their catecholamine content. Male rats (125?175 g) were killed by cervical fracture and the brain rapidly removed and frozen in powdered dry ice. The frozen brains were serially sectioned (400 µm, knife angle 30 to ...
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  • 98
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    Nature 251 (1974), S. 380-380 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE C4 dicarboxyl acid pathway of carbon fixation has now been recognised in a wide variety of plant species from at least six orders of flowering plants. In this process CO2 combines with phosphoenolpyruvate and is transported to the bundle sheath cells in the form of dicarboxylic acids, where it ...
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    Nature 251 (1974), S. 543-545 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The origins of the interferon preparations and the cells used in their assay are presented in Table 1. Several interferon preparations were prepared in our laboratory and standard techniques were used to eliminate residual inducing virus. All cells were cultivated in Eagle?s medium with 10% calf or ...
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  • 100
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    [s.l.] : Nature Publishing Group
    Nature 251 (1974), S. 557-557 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE authors define sub-clinical lead poisoning as the production of morbidity or mortality without the appearance of the classical signs or symptoms of lead poisoning. This is a highly emotive subject and (the authors are to be congratulated for dealing with it in a balanced and scientific manner. ...
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