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  • Nature Publishing Group  (56,452)
  • American Institute of Physics  (39,026)
  • American Association for the Advancement of Science  (32,743)
  • 2020-2023  (26)
  • 2020-2020
  • 1965-1969  (71,864)
  • 1950-1954  (31,791)
  • 1945-1949  (24,540)
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  • 1
    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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  • 2
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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
    Type: Article , isiRev
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  • 3
    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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  • 4
    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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  • 5
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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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  • 6
    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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  • 7
    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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  • 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).
    Repository Name: Woods Hole Open Access Server
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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.
    Repository Name: Woods Hole Open Access Server
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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.
    Repository Name: Woods Hole Open Access Server
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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).
    Repository Name: Woods Hole Open Access Server
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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).
    Repository Name: Woods Hole Open Access Server
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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.
    Repository Name: Woods Hole Open Access Server
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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 224 (1969), S. 789-789 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Two pairs of observations made at the Pulkovo Observatory in 1956 and 1967 have recently been made available in a personal communication by Professor G. A. Chebotarev. Again I have found that the same orbital elements fit these observations with residuals of only + 2 in mean longitude. On the other ...
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  • 28
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 791-791 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We originally stated that we consider that the motions of the three plates may be described as approximating to rotation about the Libyan pole of Le Pichon and Hertzler3. One of the reasons for the approximation is that there is some evidence that the plates suffer internal deformation for, ...
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  • 29
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 791-793 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We easily correlated the magnetic anomalies with the pre-existing magnetic survey3, copies of which came from M. Talwani. The field varies somewhat laterally3, but not nearly as much as the topography does. The topography of the ridge can be divided into (1) outer flanks with low undulating ...
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 946-947 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Is there a connexion between concentrations of cate-cholamines and fatty acids in the blood and the occurrence of heart attacks ? Evidence has been conflicting, but some recent results suggest that these substances are important. Last year Oliver, Kurien and Greenwood found a significant ...
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  • 31
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 395-395 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the article "Bremsstrahlung Radiation in. Intense Magnetic Fields" by Simon and Strange (Nature, 224, 49 ; 1969), equation (2) should read : ±=83c 2cosn() nr2Qw df dpz dpz and five lines below read "Assuming that Qw(pz = ± ) f(± ) = ...
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  • 32
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 395-395 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the article "Petrological, Magnetic and Chemical Properties of Basalt dredged from an Abyssal Hill in the North-east Pacific" by B. P. Luyendyk and C. G. Engel (Nature, 223, 1049; 1969), several lines were omitted from the text. The first few sentences of the second paragraph on page 1050 should ...
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  • 33
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 396-396 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Monday, October 27 A Basis for a Mathematical Theory of Direction-Defining Radio Beacons (5.30 p.m.) Mr C. W. Earp, Institution of Electrical Engineers, at Savoy Place, London WC2. Scientific Aspects of Margarine (10 a.m.) Society of Chemical Industry; Royal Society of Health; and IFST, at the ...
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  • 34
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 201-202 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE strange affairs of the British nuclear power industry continue to raise in the minds of honest people the simple question whether the British Government knows what it is trying to accomplish in this important field. A long time has gone since the Ministry of Technology first described, in July ...
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  • 35
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 203-203 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE undoubted excitement and propaganda stimulus of the multiple Soyuz flight has tended both to re-stress and obscure the current aims of the Russian space programme. Certainly, the prestige of a space spectacular, starring more men in orbit than ever before, would appear to be an attempt to ...
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  • 36
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 204-205 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A $3-3 MILLION solar telescope at the Sacramento Peak Observatory of the Air Force Cambridge Research Laboratories is now operational. The telescope is described as the most important new instrument for solar observations to be built in the United States for a decade and its resolving power ...
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  • 37
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 206-206 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE annual battle for staff and funds between university departments is often won by those who shout the loudest, not by those who are most deserving. A notable departure from this laissez-faire situation is the procedure used at Stirling University whereby the allocation of staff between ...
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  • 38
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 207-207 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE Conservative Party Conference resulted in little change in the party's policies on education or the Common Market and consequently there was no change in its attitude towards science. No other motion greatly affecting science and technology was debated and, following the example set by the ...
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  • 39
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 208-208 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE last salmon to be taken up river in the lower Thames was caught in June 1833 and the commercial fisheries, some of which brought in annual catches worth £5,000 a year, disappeared a few decades later. The villain of the piece was an English invention, the water closet, which by its ...
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  • 40
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 208-209 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE Council for Nature is in a stronger position than ever before. This is the conclusion of its chairman, Sir Landsborough Thomson, reviewing progress since the adoption of a new constitution in April 1968 (Working for Nature, Council for Nature report 1968-69, 2s). Before the change, which ...
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  • 41
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 210-211 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE House of Commons Select Committee on Science and Technology has fired several shots across the ambitious bows of the Natural Environment Research Council in the report on the inquiry into the council's operations carried out earlier this year (HMSO, £1 Ss 6d). Although the general tone of ...
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  • 42
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 977-977 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Dream Psychology and the New Biology of Dreaming Edited by Milton Kramer, in collaboration with Roy M. Whitman, Bill J. Baldridge and Paul H. Ornstein. Pp. xvi + 459. (Thomas: Springfield, Illinois, July 1969.) $17. HERE is an American book devoted to dreams, with contributions from ...
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 977-978 
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] George III and the Mad-Business By Ida Macalpine and Richard Hunter. Pp. xv + 407. (Allen Lane (The Penguin Press): London, November 1969.) 70s. To make a medical diagnosis from historical data is always a risky business. And yet there are many publications on problems as diverse as the Plague of ...
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 978-979 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Louisiana Its Land and People. By Fred B. Kniffen. Pp. 196. (Louisiana State University Press: Baton Rouge, 1968.) $7.50. Imperial Texas An Interpretive Essay in Cultural Geography. By D. W. Meinig. Pp. 145+17 plates. (University of Texas Press: Austin and London, 1969.) $4.50; 43s. ...
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    Nature 224 (1969), S. 980-980 
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Relativity By Ray Skinner, (A Blaisdell Book in Pure and Applied Sciences.) Pp. xii+340. (Blaisdell (Ginn): Waltham, Massachusetts and London, 1969.) $12.50. THERE is fast becoming a standard American textbook style, deriving perhaps from the Feynman Lectures in Physics. The books are ...
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    Nature 224 (1969), S. 804-806 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Chang liver cells were grown in 5 per cent CO2 in Eagle's minimal essential medium with Earle's balanced salt solution supplemented with non-essential amino-acids, antibiotics and 10 per cent heat-inactivated calf serum. The nutrient medium was changed daily and the experiments were performed ...
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    Nature 224 (1969), S. 806-806 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our experimental design was similar to that of previous studies6-7 in which toxic effects of ethanol on liver and bone marrow in man were demonstrated. Four asymptomatic, haematologically normal adult male volunteers with normal liver biopsies and a history of chronic alcoholism were studied. ...
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 808-809 
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    Notes: [Auszug] Islets of Langerhans were isolated from male guinea-pigs by collagenase digestion of the pancreas using methods previously described for rabbit pancreas6. Because the glucagon secreting a cells in the guinea-pig are situated uniformly throughout the islet mass7, they are less susceptible to damage ...
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    Nature 224 (1969), S. 809-810 
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    Notes: [Auszug] Long-Evans rats were administered 50 mg Cyclophosphamide per kg weight, intraperitoneally, on alternate days for a total of four injections. The animals were then injected intravenously with a 0*20 ml. suspension containing 2 x 108 viable staphylococci. At various times thereafter, animals were ...
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    Nature 224 (1969), S. 810-811 
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    Notes: [Auszug] I have been immunizing chimpanzees with Australia antigen and now report findings on the presence of Australia antigens in the chimpanzees, as well as the successful immunization of chimpanzees with this antigen, which produced quantities of Australia antigen specific antiserum. These observations ...
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    Nature 224 (1969), S. 806-808 
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    Notes: [Auszug] We show here that when the nutritional level of the medium is suddenly reduced, a transient phase of more rapid TAT degradation appears. This "enhanced degradation" is inhibited by actinomycin D and cycloheximide, in the presence of which TAT degradation approaches its slower "normal" rate. ...
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    Nature 224 (1969), S. 811-813 
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    Notes: [Auszug] Early attempts to identify the factor were hampered by its extreme sensitivity to mild procedures, but did demonstrate that it was not identical with any of fifty selected indoles, including bufotenin. To improve resolution, we developed a new hybrid two-dimensional system utilizing thin-layer ...
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    Nature 224 (1969), S. 813-815 
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    Notes: [Auszug] Although there have been many theories of the meaning of alpha rhythm3-5 the most common EEG index used has been the degree to which alpha rhythm is present. A common assumption underlying use of an alpha frequency index is that it constitutes a measure of cortical excitability. It has been argued ...
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    Nature 224 (1969), S. 815-817 
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    Notes: [Auszug] Using Schistocerca gregaria I have examined the mechanical response of a group of intersegmental muscles to electrical stimulation of the nerve running to them in embryos and in newly hatched hoppers. I denned the stage of development as a percentage of the incubation period of the egg pods from ...
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    Nature 224 (1969), S. 992-992 
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    Notes: [Auszug] Plant Variation and Evolution By D. Briggs and S. M. Walters. (World University Library.) Pp. 256. (Weidenfeld and Nicolson: London, August 1969.) 35s boards; 18s paper. So many of the problems that faced the early workers on variations in plants and animals are easily understandable to us today. ...
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    Nature 224 (1969), S. 993-993 
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    Notes: [Auszug] Planarian Regeneration By H. V. Brondsted. (International Series of Monographs in Pure and Applied Biology, Zoology Division, Vol. 42.) Pp. viii + 276 + 20 plates. (Pergamon: Oxford, London and New York, October 1969.) 100s; $13.50. DALYELL'S arresting aphorism no doubt has ...
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    Nature 224 (1969), S. 993-994 
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    Notes: [Auszug] Practical Invertebrate Zoology A Laboratory Manual for the Study of the Major Groups of Invertebrates, excluding Protochordates. By F. E. G. Cox, R. Phillips Dales, J. Green, J. E. Morton, D. Nichols and D. Wakelin. Biology Series.) Pp. xii + 356. (Sidgwick and Jackson: London, 1969.) 25s. ...
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    Notes: [Auszug] Although there has been much speculation as to the nature of the pigmented bodies within the ciliate, direct morphological and experimental information has been difficult to obtain because attempts to culture the ciliate have failed and because it is extremely sensitive to handling and routine ...
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    Nature 223 (1969), S. 1333-1335 
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    Notes: [Auszug] EVEN though one knows the primary structure of several ZRNA species and one adopts the highly base-paired secondary structure suggested' by Holley et al.1 (Fig. 1) for £RNA^al, there is still a great deal of latitude in the choice of the relative positions of the four base-paired segments. ...
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    Nature 223 (1969), S. 1340-1342 
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    Notes: [Auszug] A new amber suppressor which can exist only in su+/su− heterozygotes inserts glutamine in response to the UAG ...
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    Nature 223 (1969), S. 1335-1339 
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    Notes: [Auszug] Three species of RNA which sediment at 9–10S and are synthesized in the nuclei of cleaving sea urchin embryo cells are tentatively identified as the messenger RNAs for the three chief classes of ...
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    Nature 223 (1969), S. 1342-1348 
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    Notes: [Auszug] These electron transfer agents often have unusually low redox potentials. Eighteen are known from higher plants and bacteria, and are involved in nitrogen fixation as well as ...
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    Notes: [Auszug] We have analysed in some detail the evolution of these condensations during the cooling down of the universe, and the results are described here together with the consequences for galaxy and quasar formation. There are distinct differences between the hadronic and leptonic era and the radiation ...
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    Nature 223 (1969), S. 1350-1351 
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    Notes: [Auszug] There are several difficulties in first attempts to interpret these observations. For example, Kraft and Demoulin3 suggested that Cyg X-2 may be a triple system in order to account for their observation that the radial velocities passed through separate minima on two nights at about - 200 km s-1, ...
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    Nature 223 (1969), S. 1351-1352 
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    Notes: [Auszug] We briefly examine here a simple radiation mechanism based on the vectorial acceleration of relativistic electrons with y= (j^/mc2)^〉l. A more detailed discussion of this and alternative mechanisms will be published separately. We shall concentrate on the class of models of "intermediate" and ...
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    Notes: [Auszug] This change qualifies Creer's argument and, moreover, shows that the polar wandering curve for South America was undefined in the long period between the Permian and the Middle Cretaceous. Table 1. THERMOREMANENT MAGNETIZATION OF LOWER TRIASSIC LAVAS (35 S, 68 W) (FORTY SAMPLES) Declination ...
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    Nature 223 (1969), S. 1354-1355 
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    Notes: [Auszug] Considering one half of a symmetrical model for a mid-ocean ridge, the formation of new crust by igneous activity requires the release of heat at a rate, Q^ where (?*〉 = wAp(£ + (7pAjP) andi£ is the half spreading rate, h is the thickness of the igneous material in the crust, p its ...
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    Nature 223 (1969), S. 1356-1356 
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    Notes: [Auszug] Samples from the same terrace were taken for dating by ion exchange1. Soil samples were taken at intervals of 4 inches for the first 2 feet beneath the surface and then at intervals of 1 foot to a depth of 5 feet. The samples were screened and the fine fraction (that which passed through a screen ...
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    Nature 223 (1969), S. 1356-1359 
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    Notes: [Auszug] Since collection, the cores have partially dried out and the bright coloration mentioned in the shipboard log of core 5233 is no longer apparent, the banding being domin-antly red-brown in a buff matrix of calcareous sediment (Table 1). The loss of colour since collection is tentatively attributed ...
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    Notes: [Auszug] The orange bands of FeO at X 6000 A have been known for many years9. More recently they have been observed in absorption in flash photolysis10 and in flash heating11. Low pressure arcs provide a better source of the bands in emission, and some of the lines of bands of a v' = 0 progression have ...
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    Nature 224 (1969), S. 844-845 
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    Notes: [Auszug] 'NITINOLS', a range of alloys approximating to the composition NiTi, have unique mechanical properties, which should make them very useful. An object made of 'Nitinol' can be deformed to an arbitrary shape, briefly heated to "fix" that shape, and then possesses a "memory". If it is straightened or ...
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    Nature 223 (1969), S. 1361-1362 
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    Notes: [Auszug] I now show that concentrated solutions or sols of oriented F-actin do in fact give a strong equatorial diffraction maximum, the position of which varies with concentration in the manner expected for an array of regularly packed, mutually repulsive cylinders. The spacing has been observed between ...
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    Nature 223 (1969), S. 1364-1365 
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    Notes: [Auszug] During a survey of the ribosome profiles of E. coli growing at various growth rates, I found a 30$, 50$ and 70$ pattern similar to that described by Kohler et al*. When, however, NaCl was substituted for KC1 in the buffer of the sucrose gradients, the amount of 70$ ...
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    Nature 224 (1969), S. 829-830 
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    Notes: [Auszug] Sir,-May I, in the interests of accuracy, make two comments on Dr Macleod's interesting article, "Private Army of Contributors", in the centenary issue of Nature (224, 445; 1969) ? (1) The statement that I "was writing a biography of Lockyer in 1927-28" may strengthen a false impression that there ...
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    Notes: [Auszug] SIR,-The current term "environmental studies" would seem to be of use as a general description of the total or some convenient grouping of parts, but, because of the considerable overlap between the various components, unification has been, and is being, pursued in order to systematize further the ...
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    Notes: [Auszug] SIR,-This year it has become fashionable to talk of human biology as one might talk of physics or philosophy, and the new school of human sciences at Oxford (see Nature, 223, 660; 1969) has encouraged some to see in it a great leap forward. I do wonder, however, what are the concrete gains to be ...
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    Nature 224 (1969), S. 830-831 
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    Notes: [Auszug] University News Dr J. O. L. King, faculty of veterinary science, has been awarded the status and title of professor at the University of Liverpool. The title of professor of urology has been conferred on Mr J. P. Blandy, in respect of his post at the London Hospital Medical College, University of ...
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    Nature 224 (1969), S. 831-831 
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    Notes: [Auszug] Monday, November 24 Factors Controlling Plasma Albumin Metabolism (4 p.m.) Dr R. Hoffen-berg, University of London, at the Royal Postgraduate Medical School, Du Cane Road, London W12. Force and Inertia in Seventeenth Century Dynamics (5.30 p.m.) Dr W. A. Gabbey, British Society for the History of ...
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    Notes: [Auszug] Prior treatment of human allograft recipients with aggregate-free normal horse immunoglobulin circumvents the problem of antibody formation in subsequent anti-lymphocytic globulin ...
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    Nature 224 (1969), S. 631-632 
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    Notes: [Auszug] THERE seems very little chance that the British medical profession and the British press will find a sensible way of safeguarding their different interests in the management of the publicity which inevitably attends operations for the transplantation of human hearts. Last week, the Press Council ...
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    Notes: [Auszug] A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE "To the solid ground of Nature trusts the mind which builds for eye."-WORDSWORTH From a review by C. Kingsley of The World of the Sea, by M. Moquin Tandon, from Nature, 1, 78, November 18, 1869. For the sake, therefore) of preserving the virtue of ...
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    Nature 224 (1969), S. 633-633 
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    Notes: [Auszug] BECAUSE the biological sciences have never been regarded as capital intensive, the grant of £200,000 which has just been awarded for biochemical engineering at University College London seems large. In relation to the cost of the equipment being used, and the possibilities which may be opened ...
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    Notes: [Auszug] THE surprising appointment of Professor Hans Leussink to the post held with such eclat by DY Gerhard Stoltenberg (CDU) in the previous West German government, together with a change of title, suggests that the new minister will have a different role from that of his predecessor and that university ...
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    Nature 224 (1969), S. 634-634 
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    Notes: [Auszug] THE prospects for a large scale British carbon fibre industry were dealt a severe blow last week. After an extensive survey of the possible market for carbon fibre, Imperial Chemical Industries Ltd has announced that it is to drop its plans for a £5 million factory to produce the material. It ...
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    Notes: [Auszug] CAMBERLEY in Surrey ought to be safe from rabies after the Ministry of Agriculture's two-day shoot of local wild life at the end of October. The hunt, intended to eliminate as far as possible any spread of infection from a dog called Fritz which died of the disease (see Nature,224, 399; 1969), ...
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    Nature 224 (1969), S. 635-635 
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    Notes: [Auszug] ALTHOUGH there was an improved performance by the British scientific instrument industry last year, the industry's research association has not done as well as was hoped when the association celebrated its golden jubilee a year ago. The annual report of the Scientific Instrument Research ...
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    Notes: [Auszug] THE United Kingdom has an import bill for fish meal and oil of more than £20 million a year, equivalent to more than one million tons of fish, and the Marine Laboratory at Aberdeen is one of the laboratories concerned to reduce this bill. In its report for 1968 (HMSO, 15s) the laboratory, ...
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    Nature 224 (1969), S. 895-895 
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    Notes: [Auszug] But when the dimensions of the reaction system become greatly enlarged, for example on the geological scale, energy dissipation for even weak detonations becomes relatively much less important1. Weak detonations are thus a definite possibility for really large masses of reacting material. Tentative ...
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    Notes: [Auszug] In this article we call attention to the polarization characteristics along particular frequency-time elements ("fine-structures"2) in a PC 1 event. The sonogram (Fig. 2) shows the event to be a normal periodically structured PC 1 event except for two conspicuous elements which extend up to higher ...
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    Nature 224 (1969), S. 899-901 
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    Notes: [Auszug] Fig. 1. Scanning electron micrographs of Globorotalia truncatulinoides and Globorotalia tosaensis in core Eltanin 21-5. Top, G. truncatulinoides from upper part of the core; middle, G. tosaensis from middle part of core; bottom, G. truncatulinoides from lower part of core. G. truncatulinoides has ...
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    Nature 224 (1969), S. 902-904 
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    Notes: [Auszug] Two contrasting patterns of surface temperature distribution can be distinguished from the ART results: one associated with active upwelling and high wind velocity (see Fig. la), and the other with quiescent conditions and moderate winds (see Fig. 16). The wind blew constantly from the southeast ...
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    Nature 224 (1969), S. 905-905 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Anderson2 has shown that for reasonably compressible materials such as quartz and cadmium the previously neglected equation originally derived by Murnaghan3 In V0/V=1/B0in[B0(P/Bo)+1] where B0 and B'0 are the ambient isothermal bulk modulus and its first pressure derivative, agrees well with ...
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 907-908 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The theory of tunnelling across a dielectric separating two metallic films or plates is well described by Simmons2, but that between small islands where the transfer of charge can significantly effect their relative voltages is still obscure. Neugebauer and Webb describe charge transfer where some ...
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 640-640 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A FEW months ago Bahcall, Gunn and Schmidt (Astrophys. J. Lett., 157, L77; 1969) announced that the quasi-stellar object B 264 has the same red-shift (z = 0.09) as a cluster of galaxies in which it is situated on the plane of the sky. Although they were cautious about the significance of their ...
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  • 95
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 639-640 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE annual recurrence of the Leonid meteor shower on November 17 is not expected to be anything like as impressive as in 1966, but the display could still be above average. Last year, observers in the United States and Japan reported sighting up to a hundred meteors during an hour of observing ...
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 640-641 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ONE of the surprising turns taken by astronomy in the past year has been the way the study of the constituents of interstellar space has become almost overnight as much the province of the chemist as of the astronomer. The particular problem is the nature of the interstellar material?gas and ...
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 641-641 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE traditional image of prisoners sewing mail bags in Her Majesty's prison workshops will be transformed by the news that four prisoners at Arundel open prison are now punching geomagnetic data on computer cards. This is part of an international scheme for putting into machine readable form all ...
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    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 642-643 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] GLASSES, like liquids, have long been viewed askance by physicists because they are so resistant to theoretical treatment. But now there is a search for more sophisticated statistical models for the disordered, "amorphous" structure of glasses. An important step in refining the structure of pure ...
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    [s.l.] : Nature Publishing Group
    Nature 223 (1969), S. 1388-1388 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Plasma ammo-acids. 1, Phenylketonuria (Ph, phenylalanine): 2, normal plasma; 3, tyrosinosis (T, tyrosine; M, methionine); 4, marker (Y, yellow; 0, orange; It, red). We cut against the "grain" two plates (10x20 cm) from the 20 cm square layers supplied. .(Solvent flow with the grain is 20 ...
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    [s.l.] : Nature Publishing Group
    Nature 223 (1969), S. 1389-1389 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] I AM sure that most people will agree that the most important advance in our understanding of biology in the first half of the sixties was the solution of the genetic code. How this was achieved is the subject of Dr M. Ycas's monograph. But it was in the early days of coding, the 1950s, that the ...
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