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  • American Association for the Advancement of Science  (59.293)
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  • 1
    Publikationsdatum: 2022-05-25
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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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  • 2
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    American Association for the Advancement of Science
    Publikationsdatum: 2022-05-25
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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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  • 3
    Publikationsdatum: 2022-09-13
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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.).
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  • 4
    Publikationsdatum: 2022-05-27
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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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  • 5
    Publikationsdatum: 2022-05-27
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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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  • 6
    Publikationsdatum: 2022-05-27
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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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  • 7
    Publikationsdatum: 2022-05-27
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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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  • 8
    Publikationsdatum: 2022-05-27
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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.
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  • 9
    Publikationsdatum: 2022-05-27
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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.
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  • 10
    Publikationsdatum: 2022-05-27
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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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  • 11
    Publikationsdatum: 2022-05-27
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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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  • 12
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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
    Publikationsdatum: 2022-10-01
    Beschreibung: 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.
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  • 13
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    American Association for the Advancement of Science
    Publikationsdatum: 2022-06-09
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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.
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  • 14
    Publikationsdatum: 2022-07-25
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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.
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  • 15
    Publikationsdatum: 2022-05-26
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: M.D. acknowledges support the Stanford Gerald J. Lieberman Fellowship and the Postdoctoral Scholarship from Woods Hole Oceanographic Institution.
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  • 16
    Publikationsdatum: 2022-05-26
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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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  • 17
    Publikationsdatum: 2022-05-26
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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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  • 18
    Publikationsdatum: 2022-05-26
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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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  • 19
    Publikationsdatum: 2022-05-26
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: This work was funded by Ocean Conservancy through support from the Arthur Vining Davis Foundations.
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  • 20
    Publikationsdatum: 2022-05-26
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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
    Publikationsdatum: 2022-05-26
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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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  • 22
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-01-09
    Beschreibung: Continental extension and volcanism are generally thought to be complementary. Stratigraphic and structural data from some highly extended parts of the Basin and Range province reveal instead that rapid extension appears to have suppressed volcanism. This relation may reflect enhanced crystallization of midcrustal magmas during extension resulting from exsolution of magmatic volatiles, increased interaction of magmas with meteoric water, and dispersal of magma into smaller bodies. Some rift environments may thus be characterized by voluminous synextensional plutonism with little or no concomitant volcanism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gans -- Bohrson -- New York, N.Y. -- Science. 1998 Jan 2;279(5347):66-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geological Sciences and Institute for Crustal Studies, University of California, Santa Barbara, CA 93106, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9417024" target="_blank"〉PubMed〈/a〉
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 23
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-01-28
    Beschreibung: Treatment of the tungsten dinitrogen complex cis-[W(N2)2(PMe2Ph)4] (Me = methyl, Ph = phenyl) with an equilibrium mixture of [RuCl(dppp)2]X and trans-[RuCl(eta2-H2)(dppp)2]X [X = BF4, PF6, or OSO2CF3; dppp = 1,3-bis(diphenylphosphino)propane] under 1 atmosphere of dihydrogen at 55 degrees Celsius for 24 hours gave NH3 in moderate yield. The same reaction in the presence of acetone produced acetone azine in high yield. None of these reactions proceeded in the absence of dihydrogen.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nishibayashi -- Iwai -- Hidai -- New York, N.Y. -- Science. 1998 Jan 23;279(5350):540-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9438842" target="_blank"〉PubMed〈/a〉
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  • 24
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-09-28
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Caroni, P -- New York, N.Y. -- Science. 1998 Sep 4;281(5382):1465-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Friedrich Miescher Institute, Basel, Switzerland. caroni@fmi.ch〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9750116" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acetylcholine/physiology ; Animals ; Axons/*physiology ; Brain-Derived Neurotrophic Factor/physiology ; Calcium/metabolism ; Cell Movement ; Cyclic AMP/*physiology ; Cyclic GMP/*physiology ; Glycoproteins/physiology ; Nerve Growth Factors/physiology ; Neurons/*physiology ; Neurotrophin 3 ; Semaphorin-3A ; Signal Transduction ; Tumor Suppressor Proteins
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  • 25
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-10-17
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sikorski, R -- Peters, R -- New York, N.Y. -- Science. 1998 Sep 18;281(5384):1823.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9776688" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Blood Vessels/physiology ; Chick Embryo ; *Chorion/blood supply ; Humans ; Metalloendopeptidases/metabolism ; *Neoplasm Metastasis ; Neoplasm Seeding ; *Polymerase Chain Reaction ; Receptors, Cell Surface/metabolism ; Receptors, Urokinase Plasminogen Activator ; Tumor Cells, Cultured
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  • 26
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-07-24
    Beschreibung: Connections in the developing nervous system are thought to be formed initially by an activity-independent process of axon pathfinding and target selection and subsequently refined by neural activity. Blockade of sodium action potentials by intracranial infusion of tetrodotoxin in cats during the early period when axons from the lateral geniculate nucleus (LGN) were in the process of selecting visual cortex as their target altered the pattern and precision of this thalamocortical projection. The majority of LGN neurons, rather than projecting to visual cortex, elaborated a significant projection within the subplate of cortical areas normally bypassed. Those axons that did project to their correct target were topographically disorganized. Thus, neural activity is required for initial targeting decisions made by thalamic axons as they traverse the subplate.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Catalano, S M -- Shatz, C J -- EY02838/EY/NEI NIH HHS/ -- EY06491/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1998 Jul 24;281(5376):559-62.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720-3200, USA. scatalan@cco.caltech.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9677198" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Action Potentials/drug effects ; Animals ; Auditory Cortex/cytology/embryology ; Axons/*physiology/ultrastructure ; Carbocyanines ; Cats ; Dendrites/ultrastructure ; Geniculate Bodies/cytology/*embryology ; Neural Pathways ; Tetrodotoxin/pharmacology ; Visual Cortex/cytology/*embryology
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  • 27
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-03-28
    Beschreibung: The metabotropic glutamate receptors (mGluRs) are widely distributed in the brain and play important roles in synaptic plasticity. Here it is shown that some types of mGluRs are activated not only by glutamate but also by extracellular Ca2+ (Ca2+o). A single amino acid residue was found to determine the sensitivity of mGluRs to Ca2+o. One of the receptors, mGluR1alpha, but not its point mutant with reduced sensitivity to Ca2+o, caused morphological changes when transfected into mammalian cells. Thus, the sensing of Ca2+o by mGluRs may be important in cells under physiological condition.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kubo, Y -- Miyashita, T -- Murata, Y -- New York, N.Y. -- Science. 1998 Mar 13;279(5357):1722-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurophysiology, Tokyo Metropolitan Institute for Neuroscience, Musashidai 2-6, Fuchu, Tokyo 183-8526, Japan. ykubo@tmin.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9497291" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Actins/ultrastructure ; Amino Acid Sequence ; Animals ; Binding Sites ; Brain/metabolism ; CHO Cells ; Calcium/*metabolism/pharmacology ; Cell Size ; Cricetinae ; Cyclic AMP/metabolism ; G Protein-Coupled Inwardly-Rectifying Potassium Channels ; Glutamic Acid/metabolism/pharmacology ; Molecular Sequence Data ; Oocytes ; Point Mutation ; Potassium Channels/metabolism ; *Potassium Channels, Inwardly Rectifying ; Rats ; Receptors, Metabotropic Glutamate/chemistry/genetics/*metabolism ; Recombinant Fusion Proteins/metabolism ; Second Messenger Systems ; Transfection ; Xenopus laevis
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  • 28
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-09-11
    Beschreibung: The motion of single, dye-labeled protein molecules was monitored at various pH and ionic strengths within the 180-nanometer-thick evanescent-field layer at a fused-silica surface. Below the isoelectric point, molecules partitioning into the excitation region increased in number but maintained a random spatial distribution, implying that surface charge can influence the charged protein at distances beyond that of the electrical double-layer thickness. The residence times of the molecules in the interfacial layer also increased below the isoelectric point. However, immobilization on the solid surface for extended periods was not observed. Histograms of residence times exhibit nearly identical asymmetry as the corresponding elution peaks in capillary electrophoresis. These results are a direct verification of the statistical theory of chromatography at the single-molecule level, with the caveat that long-range trapping rather than adsorption is the dominant mechanism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, X H -- Yeung, E S -- New York, N.Y. -- Science. 1998 Sep 11;281(5383):1650-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ames Laboratory-U.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, IA 50011, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9733506" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Chemistry, Physical ; Chromatography ; Concanavalin A/*chemistry ; Diffusion ; Electrophoresis, Capillary ; Fluorescence ; Hydrogen-Ion Concentration ; Isoelectric Point ; Osmolar Concentration ; Physicochemical Phenomena ; Proteins/*chemistry ; Rhodamines ; Static Electricity
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  • 29
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-07-17
    Beschreibung: During RNA synthesis in the ternary elongation complex, RNA polymerase enzyme holds nucleic acids in three contiguous sites: the double-stranded DNA-binding site (DBS) ahead of the transcription bubble, the RNA-DNA heteroduplex-binding site (HBS), and the RNA-binding site (RBS) upstream of HBS. Photochemical cross-linking allowed mapping of the DNA and RNA contacts to specific positions on the amino acid sequence. Unexpectedly, the same protein regions were found to participate in both DBS and RBS. Thus, DNA entry and RNA exit occur close together in the RNA polymerase molecule, suggesting that the three sites constitute a single unit. The results explain how RNA in the integrated unit RBS-HBS-DBS may stabilize the ternary complex, whereas a hairpin in RNA result in its dissociation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nudler, E -- Gusarov, I -- Avetissova, E -- Kozlov, M -- Goldfarb, A -- GM49242/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1998 Jul 17;281(5375):424-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, New York University Medical Center, New York, NY 10016, USA. evgeny.nudler@med.nyu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9665887" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Binding Sites ; DNA, Bacterial/chemistry/*metabolism ; DNA-Directed RNA Polymerases/chemistry/*metabolism ; Escherichia coli/*genetics/metabolism ; Idoxuridine/metabolism ; Models, Genetic ; Nucleic Acid Conformation ; Nucleic Acid Heteroduplexes/*metabolism ; Protein Binding ; RNA, Bacterial/chemistry/*metabolism ; Templates, Genetic ; *Transcription, Genetic ; Ultraviolet Rays
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  • 30
    Publikationsdatum: 1998-05-09
    Beschreibung: The type III secretion system of Salmonella typhimurium directs the translocation of proteins into host cells. Evolutionarily related to the flagellar assembly machinery, this system is also present in other pathogenic bacteria, but its organization is unknown. Electron microscopy revealed supramolecular structures spanning the inner and outer membranes of flagellated and nonflagellated strains; such structures were not detected in strains carrying null mutations in components of the type III apparatus. Isolated structures were found to contain at least three proteins of this secretion system. Thus, the type III apparatus of S. typhimurium, and presumably other bacteria, exists as a supramolecular structure in the bacterial envelope.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kubori, T -- Matsushima, Y -- Nakamura, D -- Uralil, J -- Lara-Tejero, M -- Sukhan, A -- Galan, J E -- Aizawa, S I -- New York, N.Y. -- Science. 1998 Apr 24;280(5363):602-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biosciences, Teikyo University, 1-1 Toyosatodai, Utsunomiya 320, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9554854" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Bacterial Outer Membrane Proteins/analysis ; Bacterial Proteins/*analysis/chemistry/*metabolism/ultrastructure ; Cell Membrane/chemistry/ultrastructure ; Centrifugation, Density Gradient ; Macromolecular Substances ; Membrane Proteins/*analysis/chemistry/ultrastructure ; *Membrane Transport Proteins ; Microscopy, Electron ; Microscopy, Immunoelectron ; Porins/analysis ; Salmonella typhimurium/*chemistry/metabolism/*ultrastructure
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 31
    Publikationsdatum: 1998-03-21
    Beschreibung: The T cell receptor (TCR) inherently has dual specificity. T cells must recognize self-antigens in the thymus during maturation and then discriminate between foreign pathogens in the periphery. A molecular basis for this cross-reactivity is elucidated by the crystal structure of the alloreactive 2C TCR bound to self peptide-major histocompatibility complex (pMHC) antigen H-2Kb-dEV8 refined against anisotropic 3.0 angstrom resolution x-ray data. The interface between peptide and TCR exhibits extremely poor shape complementarity, and the TCR beta chain complementarity-determining region 3 (CDR3) has minimal interaction with the dEV8 peptide. Large conformational changes in three of the TCR CDR loops are induced upon binding, providing a mechanism of structural plasticity to accommodate a variety of different peptide antigens. Extensive TCR interaction with the pMHC alpha helices suggests a generalized orientation that is mediated by the Valpha domain of the TCR and rationalizes how TCRs can effectively "scan" different peptides bound within a large, low-affinity MHC structural framework for those that provide the slight additional kinetic stabilization required for signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Garcia, K C -- Degano, M -- Pease, L R -- Huang, M -- Peterson, P A -- Teyton, L -- Wilson, I A -- AI42266/AI/NIAID NIH HHS/ -- AI42267/AI/NIAID NIH HHS/ -- R01 CA58896/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1998 Feb 20;279(5354):1166-72.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and the Skaggs Institute of Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9469799" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Crystallization ; Crystallography, X-Ray ; H-2 Antigens/*chemistry/*immunology/metabolism ; Ligands ; Mice ; Mice, Transgenic ; Models, Molecular ; Mutation ; Oligopeptides/*chemistry/immunology/metabolism ; Protein Conformation ; Protein Structure, Secondary ; Receptors, Antigen, T-Cell, alpha-beta/*chemistry/*immunology/metabolism ; Recombinant Proteins
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  • 32
    Publikationsdatum: 1998-12-16
    Beschreibung: A peripheral membrane protein that is interactive with lymphocytic choriomeningitis virus (LCMV) was purified from cells permissive to infection. Tryptic peptides from this protein were determined to be alpha-dystroglycan (alpha-DG). Several strains of LCMV and other arenaviruses, including Lassa fever virus (LFV), Oliveros, and Mobala, bound to purified alpha-DG protein. Soluble alpha-DG blocked both LCMV and LFV infection. Cells bearing a null mutation of the gene encoding DG were resistant to LCMV infection, and reconstitution of DG expression in null mutant cells restored susceptibility to LCMV infection. Thus, alpha-DG is a cellular receptor for both LCMV and LFV.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cao, W -- Henry, M D -- Borrow, P -- Yamada, H -- Elder, J H -- Ravkov, E V -- Nichol, S T -- Compans, R W -- Campbell, K P -- Oldstone, M B -- AG 00080/AG/NIA NIH HHS/ -- AI 09484/AI/NIAID NIH HHS/ -- DK09712/DK/NIDDK NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1998 Dec 11;282(5396):2079-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Virology, Department of Neuropharmacology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9851928" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acid Sequence ; Animals ; Arenavirus/metabolism ; Cell Line ; Cytoskeletal Proteins/chemistry/genetics/*metabolism ; Dystroglycans ; Lassa virus/*metabolism/physiology ; Lymphocytic choriomeningitis virus/*metabolism/physiology ; Membrane Glycoproteins/chemistry/genetics/*metabolism ; Mice ; Molecular Sequence Data ; Mutation ; Receptors, Virus/chemistry/*metabolism ; Recombinant Fusion Proteins/metabolism ; Virus Replication
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  • 33
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-10-30
    Beschreibung: High-precision mass spectrometric analysis of chromium in sediment samples from the Cretaceous-Tertiary (K-T) boundary coincident with the extinction of numerous organisms on Earth confirms the cosmic origin of the K-T phenomenon. The isotopic composition of chromium in K-T boundary samples from Stevns Klint, Denmark, and Caravaca, Spain, is different from that of Earth and indicates its extraterrestrial source. The chromium isotopic signature is consistent with a carbonaceous chondrite-type impactor. The observed differences in the chromium isotopic composition among various meteorite classes can serve as a diagnostic tool for deciphering the nature of impactors that have collided with Earth during its history.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shukolyukov, A -- Lugmair, G W -- New York, N.Y. -- Science. 1998 Oct 30;282(5390):927-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0212, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9794759" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Chromium/analysis ; Chromium Isotopes/*analysis ; Denmark ; *Earth (Planet) ; Geologic Sediments/*chemistry ; Mass Spectrometry ; *Meteoroids ; Spain
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  • 34
    Publikationsdatum: 1998-10-17
    Beschreibung: The Trifid nebula is a young (10(5) years) galactic HII region where several protostellar sources have been detected with the infrared space observatory. The sources are massive (17 to 60 solar masses) and are associated with molecular gas condensations at the edges or inside the nebula. They appear to be in an early evolutionary stage and may represent the most recent generation of stars in the Trifid. These sources range from dense, apparently still inactive cores to more evolved sources, undergoing violent mass ejection episodes, including a source that powers an optical jet. These observations suggest that the protostellar sources may have evolved by induced star formation in the Trifid nebula.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cernicharo -- Lefloch -- Cox -- Cesarsky -- Esteban -- Yusef-Zadeh -- Mendez -- Acosta-Pulido -- Garcia Lopez RJ -- Heras -- New York, N.Y. -- Science. 1998 Oct 16;282(5388):462-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉J. Cernicharo, Instituto de Estructura de la Materia, Dpto. Fisica Molecular, Consejo Superior de Investigaciones Cientificas, (CSIC), Serrano 123, 28006 Madrid, Spain. B. Lefloch, Instituto de Estructura de la Materia, Dpto. Fisica Molecu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9774270" target="_blank"〉PubMed〈/a〉
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  • 35
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-05-19
    Beschreibung: Data from mid-ocean ridge basalt glasses indicate that the short-lived radionuclide plutonium-244 that was present during an early stage of the development of the solar system is responsible for roughly 30 percent of the fissiogenic xenon excesses in the interior of Earth today. The rest of the fissiogenic xenon can be ascribed to the spontaneous fission of still live uranium-238. This result, in combination with the refined determination of xenon-129 excesses from extinct iodine-129, implies that the accretion of Earth was finished roughly 50 million to 70 million years after solar system formation and that the atmosphere was formed by mantle degassing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kunz -- Staudacher -- Allegre -- New York, N.Y. -- Science. 1998 May 8;280(5365):877-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉J. Kunz, Institut de Physique du Globe de Paris, Laboratoire de Geochimie et Cosmochimie, Centre National de la Recherche Scientifique URA 1758, 4 place Jussieu, F-75252 Paris Cedex 05, France. T. Staudacher, Institut de Physique du.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9572726" target="_blank"〉PubMed〈/a〉
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 36
    Publikationsdatum: 1998-04-16
    Beschreibung: Although cytotoxic T lymphocytes (CTLs) are thought to be involved in the control of human immunodeficiency virus-type 1 (HIV-1) infection, it has not been possible to demonstrate a direct relation between CTL activity and plasma RNA viral load. Human leukocyte antigen-peptide tetrameric complexes offer a specific means to directly quantitate circulating CTLs ex vivo. With the use of the tetrameric complexes, a significant inverse correlation was observed between HIV-specific CTL frequency and plasma RNA viral load. In contrast, no significant association was detected between the clearance rate of productively infected cells and frequency of HIV-specific CTLs. These data are consistent with a significant role for HIV-specific CTLs in the control of HIV infection and suggest a considerable cytopathic effect of the virus in vivo.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ogg, G S -- Jin, X -- Bonhoeffer, S -- Dunbar, P R -- Nowak, M A -- Monard, S -- Segal, J P -- Cao, Y -- Rowland-Jones, S L -- Cerundolo, V -- Hurley, A -- Markowitz, M -- Ho, D D -- Nixon, D F -- McMichael, A J -- MO1-RR00102/RR/NCRR NIH HHS/ -- U01AI41534/AI/NIAID NIH HHS/ -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 1998 Mar 27;279(5359):2103-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Molecular Medicine, Nuffield Department of Medicine, Oxford OX3 9DS, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9516110" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Anti-HIV Agents/therapeutic use ; CD4 Lymphocyte Count ; Coloring Agents ; Cytopathogenic Effect, Viral ; Cytotoxicity, Immunologic ; Flow Cytometry ; Gene Products, gag ; Gene Products, pol ; HIV Infections/drug therapy/*immunology/*virology ; HIV-1/genetics/*physiology ; HLA-A Antigens ; Humans ; Lymphocyte Count/*methods ; Oligopeptides ; RNA, Viral/*blood ; Sensitivity and Specificity ; T-Lymphocytes, Cytotoxic/*immunology ; Viral Load ; Viremia
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  • 37
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-04-02
    Beschreibung: Nucleophilic displacement reactions (the SN2 reaction) of ions in the gas phase are a prototypical reaction system that allows a study of dynamics, mechanisms, and structure-energy relations. This article reviews aspects of the kinetics (especially the applicability of statistical reaction rate theory), the relation of structure and reactivity, and the effects of small numbers of solvent molecules on the reaction and compares the behavior of the ionic reaction in the gas phase with that in solution.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chabinyc -- Craig -- Regan -- Brauman -- New York, N.Y. -- Science. 1998 Mar 20;279(5358):1882-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉M. L. Chabinyc, C. K. Regan, and J. I. Brauman are in the Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA. S. L. Craig is in the Central Research and Development Department, E. I. DuPont de Nemours and Company, Incorporated〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9506930" target="_blank"〉PubMed〈/a〉
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  • 38
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-09-28
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gibbons, A -- New York, N.Y. -- Science. 1998 Sep 4;281(5382):1432-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9750111" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Chromosome Mapping ; *Chromosomes, Human ; Gene Expression ; *Genome ; *Genome, Human ; Hominidae/*genetics ; *Human Characteristics ; Humans ; Mutation ; Pan troglodytes/genetics ; *Sequence Analysis, DNA ; Sialic Acids/chemistry/physiology ; Species Specificity
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    Standort Signatur Erwartet Verfügbarkeit
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  • 39
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-04-29
    Beschreibung: After the vertebrate lens is induced from head ectoderm, lens-specific genes are expressed. Transcriptional regulation of the lens-specific alphaA-crystallin gene is controlled by an enhancer element, alphaCE2. A gene encoding an alphaCE2-binding protein, L-maf(lens-specific maf), was isolated. L-maf expression is initiated in the lens placode and is restricted to lens cells. The gene product L-Maf regulates the expression of multiple genes expressed in the lens, and ectopic expression of this transcription factor converts chick embryonic ectodermal cells and cultured cells into lens fibers. Thus, vertebrate lens induction and differentiation can be triggered by the activation of L-Maf.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ogino, H -- Yasuda, K -- New York, N.Y. -- Science. 1998 Apr 3;280(5360):115-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0101, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9525857" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acid Sequence ; Animals ; Basic-Leucine Zipper Transcription Factors ; Cell Differentiation ; Cells, Cultured ; Chick Embryo ; Crystallins/genetics ; DNA, Complementary ; DNA-Binding Proteins/chemistry/genetics ; Ectoderm ; Enhancer Elements, Genetic ; Eye Proteins/genetics ; G-Box Binding Factors ; *Gene Expression Regulation, Developmental ; Genes, Reporter ; Intermediate Filament Proteins/genetics ; Lens, Crystalline/*cytology/*embryology/metabolism ; Maf Transcription Factors ; Molecular Sequence Data ; Promoter Regions, Genetic ; Recombinant Fusion Proteins/metabolism ; Transcription Factors/chemistry/genetics/*metabolism ; *Transcription, Genetic ; Transcriptional Activation ; Transfection
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  • 40
    Publikationsdatum: 1998-08-07
    Beschreibung: The small guanosine triphosphatases (GTPases) Cdc42 and Rac1 regulate E-cadherin-mediated cell-cell adhesion. IQGAP1, a target of Cdc42 and Rac1, was localized with E-cadherin and beta-catenin at sites of cell-cell contact in mouse L fibroblasts expressing E-cadherin (EL cells), and interacted with E-cadherin and beta-catenin both in vivo and in vitro. IQGAP1 induced the dissociation of alpha-catenin from a cadherin-catenin complex in vitro and in vivo. Overexpression of IQGAP1 in EL cells, but not in L cells expressing an E-cadherin-alpha-catenin chimeric protein, resulted in a decrease in E-cadherin-mediated cell-cell adhesive activity. Thus, IQGAP1, acting downstream of Cdc42 and Rac1, appears to regulate cell-cell adhesion through the cadherin-catenin pathway.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kuroda, S -- Fukata, M -- Nakagawa, M -- Fujii, K -- Nakamura, T -- Ookubo, T -- Izawa, I -- Nagase, T -- Nomura, N -- Tani, H -- Shoji, I -- Matsuura, Y -- Yonehara, S -- Kaibuchi, K -- New York, N.Y. -- Science. 1998 Aug 7;281(5378):832-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Signal Transduction, Nara Institute of Science and Technology, Ikoma 630-0101, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9694656" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cadherins/*metabolism ; *Cell Adhesion ; Cell Cycle Proteins/*metabolism ; Cell Membrane/metabolism ; Cytoskeletal Proteins/metabolism ; GTP Phosphohydrolases/*metabolism ; GTP-Binding Proteins/*metabolism ; GTPase-Activating Proteins ; L Cells (Cell Line) ; Mice ; Mutation ; Proteins/*metabolism ; Recombinant Fusion Proteins/metabolism ; Recombinant Proteins/metabolism ; *Trans-Activators ; alpha Catenin ; beta Catenin ; cdc42 GTP-Binding Protein ; rac GTP-Binding Proteins
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  • 41
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-08-07
    Beschreibung: Pollen records of deglacial sequences from northwest Nelson, New Zealand, demonstrate that there was no significant temperature decline associated with the Younger Dryas in New Zealand. Records of glacial advances at this time were either the product of increased snow accumulation under enhanced precipitation regimes or random variation rather than the result of a regional thermal decline. This finding supports those models of Younger Dryas initiation that require neither enhanced westerly circulation nor significant thermal decline in the Southern Hemisphere.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Singer -- Shulmeister -- McLea -- New York, N.Y. -- Science. 1998 Aug 7;281(5378):812-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Research School of Earth Sciences, Victoria University, Post Office Box 600, Wellington, New Zealand.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9694650" target="_blank"〉PubMed〈/a〉
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  • 42
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-02-07
    Beschreibung: The Son of Sevenless (Sos) proteins control receptor-mediated activation of Ras by catalyzing the exchange of guanosine diphosphate for guanosine triphosphate on Ras. The NH2-terminal region of Sos contains a Dbl homology (DH) domain in tandem with a pleckstrin homology (PH) domain. In COS-1 cells, the DH domain of Sos stimulated guanine nucleotide exchange on Rac but not Cdc42 in vitro and in vivo. The tandem DH-PH domain of Sos (DH-PH-Sos) was defective in Rac activation but regained Rac stimulating activity when it was coexpressed with activated Ras. Ras-mediated activation of DH-PH-Sos did not require activation of mitogen-activated protein kinase but it was dependent on activation of phosphoinositide 3-kinase. These results reveal a potential mechanism for coupling of Ras and Rac signaling pathways.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nimnual, A S -- Yatsula, B A -- Bar-Sagi, D -- CA09176/CA/NCI NIH HHS/ -- CA28146/CA/NCI NIH HHS/ -- CA55360/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1998 Jan 23;279(5350):560-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Genetics and Microbiology, State University of New York at Stony Brook, Stony Brook, NY 11794, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9438849" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Actins/metabolism ; Animals ; COS Cells ; Calcium-Calmodulin-Dependent Protein Kinases/metabolism ; Cell Cycle Proteins/metabolism ; Cell Line ; Cell Membrane/ultrastructure ; Enzyme Activation ; GTP Phosphohydrolases/*metabolism ; GTP-Binding Proteins/*metabolism ; Guanine Nucleotide Exchange Factors ; Guanosine Diphosphate/metabolism ; Guanosine Triphosphate/metabolism ; Humans ; JNK Mitogen-Activated Protein Kinases ; Membrane Proteins/chemistry/*metabolism ; *Mitogen-Activated Protein Kinases ; Proteins/metabolism ; Proto-Oncogene Proteins ; Recombinant Fusion Proteins/metabolism ; Retroviridae Proteins, Oncogenic/chemistry ; Signal Transduction ; Son of Sevenless Proteins ; Transfection ; cdc42 GTP-Binding Protein ; rac GTP-Binding Proteins ; ras Guanine Nucleotide Exchange Factors ; ras Proteins/*metabolism
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  • 43
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-05-23
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gibbons, A -- New York, N.Y. -- Science. 1998 May 1;280(5364):677-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9599145" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Behavior, Animal ; Female ; *Hylobates ; Male ; *Sexual Behavior, Animal ; *Social Behavior
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 44
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-08-28
    Beschreibung: Control of the activation of apoptosis is important both in development and in protection against cancer. In the classic genetic model Caenorhabditis elegans, the pro-apoptotic protein CED-4 activates the CED-3 caspase and is inhibited by the Bcl-2-like protein CED-9. Both processes are mediated by protein-protein interaction. Facilitating the proximity of CED-3 zymogen molecules was found to induce caspase activation and cell death. CED-4 protein oligomerized in cells and in vitro. This oligomerization induced CED-3 proximity and competed with CED-4:CED-9 interaction. Mutations that abolished CED-4 oligomerization inactivated its ability to activate CED-3. Thus, the mechanism of control is that CED-3 in CED-3:CED-4 complexes is activated by CED-4 oligomerization, which is inhibited by binding of CED-9 to CED-4.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yang, X -- Chang, H Y -- Baltimore, D -- CA51462/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1998 Aug 28;281(5381):1355-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9721101" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Apoptosis ; Apoptosis Regulatory Proteins ; Biopolymers ; *Caenorhabditis elegans Proteins ; Calcium-Binding Proteins/*chemistry/genetics/*metabolism ; *Caspases ; Cell Line ; Chemistry, Physical ; Cysteine Endopeptidases/*metabolism ; Cysteine Proteinase Inhibitors/pharmacology ; Enzyme Activation ; Enzyme Precursors/metabolism ; HeLa Cells ; Helminth Proteins/*chemistry/genetics/*metabolism ; Humans ; Mutation ; Oligopeptides/pharmacology ; Physicochemical Phenomena ; Proto-Oncogene Proteins/metabolism ; Proto-Oncogene Proteins c-bcl-2/metabolism ; Recombinant Fusion Proteins/metabolism ; Tacrolimus/pharmacology ; Transfection ; bcl-X Protein
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 45
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-09-22
    Beschreibung: The mechanisms underlying visual motion detection can be studied simultaneously in different cell compartments in vivo by using calcium as a reporter of the spatiotemporal activity distribution in single motion-sensitive cells of the fly. As predicted by the Reichardt model, local dendritic calcium signals are found to indicate the direction and velocity of pattern motion but are corrupted by spatial pattern properties. The latter are canceled out by spatial integration, thus leading to a purely directional selective output signal in the axon. These findings attribute a specific computational task to the dendrites of visual interneurons and imply a functional interpretation of dendritic morphology.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Single, S -- Borst, A -- New York, N.Y. -- Science. 1998 Sep 18;281(5384):1848-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Friedrich-Miescher-Laboratory of the Max-Planck-Society, Spemannstrasse 37-39, D-72076 Tuebingen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9743497" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Axons/metabolism/physiology ; Calcium/*metabolism ; Calcium Channels/metabolism ; Dendrites/metabolism/*physiology/ultrastructure ; Diptera/physiology ; Female ; Interneurons/physiology ; Membrane Potentials ; *Motion Perception ; Photoreceptor Cells, Invertebrate/*physiology
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  • 46
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-06-20
    Beschreibung: An all-polymer semiconductor integrated device is demonstrated with a high-mobility conjugated polymer field-effect transistor (FET) driving a polymer light-emitting diode (LED) of similar size. The FET uses regioregular poly(hexylthiophene). Its performance approaches that of inorganic amorphous silicon FETs, with field-effect mobilities of 0.05 to 0.1 square centimeters per volt second and ON-OFF current ratios of 〉10(6). The high mobility is attributed to the formation of extended polaron states as a result of local self-organization, in contrast to the variable-range hopping of self-localized polarons found in more disordered polymers. The FET-LED device represents a step toward all-polymer optoelectronic integrated circuits such as active-matrix polymer LED displays.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sirringhaus -- Tessler -- Friend -- New York, N.Y. -- Science. 1998 Jun 12;280(5370):1741-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9624049" target="_blank"〉PubMed〈/a〉
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  • 47
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-05-09
    Beschreibung: Current evidence suggests that the nucleus has a distinct substructure, albeit one that is dynamic rather than a rigid framework. Viral infection, oncogene expression, and inherited human disorders can each cause profound and specific changes in nuclear organization. This review summarizes recent progress in understanding nuclear organization, highlighting in particular the dynamic aspects of nuclear structure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lamond, A I -- Earnshaw, W C -- 073915/Wellcome Trust/United Kingdom -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 1998 Apr 24;280(5363):547-53.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of Dundee, Dundee DD1 4HN, Scotland, UK. a.i.lamond@dundee.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9554838" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Nucleolus/physiology/ultrastructure ; Cell Nucleus/chemistry/*physiology/*ultrastructure ; Chromatin/physiology ; Chromosomes/physiology ; *Drosophila Proteins ; Euchromatin ; Gene Expression Regulation ; Heterochromatin/physiology ; Humans ; Insect Proteins/chemistry/physiology ; Interphase ; Neoplasm Proteins/chemistry/physiology ; *Nuclear Proteins ; Polycomb Repressive Complex 1 ; Polycomb-Group Proteins ; Repressor Proteins/chemistry/physiology ; Ribonucleoproteins, Small Nuclear/analysis/physiology ; Transcription Factors/chemistry/physiology ; Tumor Suppressor Proteins
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  • 48
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-05-09
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gibbons, A -- New York, N.Y. -- Science. 1998 Apr 17;280(5362):380-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9575083" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Anthropology, Physical ; Biological Evolution ; Brain/*anatomy & histology ; Computer Simulation ; DNA, Mitochondrial/genetics ; Female ; *Genetics, Population ; *Hinduism/history ; History, Ancient ; Hominidae/*anatomy & histology ; Humans ; India ; Male ; Models, Anatomic ; Y Chromosome/genetics
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 49
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-01-24
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gibbons, A -- New York, N.Y. -- Science. 1998 Jan 2;279(5347):28-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9441404" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): DNA Fingerprinting ; DNA, Mitochondrial/*genetics ; *Evolution, Molecular ; Forensic Medicine ; Humans ; *Mutation ; Point Mutation ; *Polymorphism, Genetic
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  • 50
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-03-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sitia, R -- Ceriotti, A -- Cabibbo, A -- Fassina, G -- Ruvo, M -- New York, N.Y. -- Science. 1998 Feb 27;279(5355):1288-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9508700" target="_blank"〉PubMed〈/a〉
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 51
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-10-17
    Beschreibung: Ultraviolet laser microprobe analyses of a calcium-aluminum-rich inclusion (CAI) from the Allende meteorite suggest that a line with a slope of exactly 1.00 on a plot of delta17O against delta18O represents the primitive oxygen isotope reservoir of the early solar nebula. Most meteorites are enriched in 17O and 18O relative to this line, and their oxygen isotope ratios can be explained by mass fractionation or isotope exchange initiating from the primitive reservoir. These data establish a link between the oxygen isotopic composition of the abundant ordinary chondrites and the primitive 16O-rich component of CAIs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Young -- Russell -- New York, N.Y. -- Science. 1998 Oct 16;282(5388):452-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉E. D. Young, Department of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, UK. E-mail: ed.young@earth.ox.ac.uk S. S. Russell, Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK. E-mail: sar.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9774267" target="_blank"〉PubMed〈/a〉
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 52
    Publikationsdatum: 1998-08-07
    Beschreibung: Clathrin-mediated endocytosis involves cycles of assembly and disassembly of clathrin coat components and their accessory proteins. Dephosphorylation of rat brain extract was shown to promote the assembly of dynamin 1, synaptojanin 1, and amphiphysin into complexes that also included clathrin and AP-2. Phosphorylation of dynamin 1 and synaptojanin 1 inhibited their binding to amphiphysin, whereas phosphorylation of amphiphysin inhibited its binding to AP-2 and clathrin. Thus, phosphorylation regulates the association and dissociation cycle of the clathrin-based endocytic machinery, and calcium-dependent dephosphorylation of endocytic proteins could prepare nerve terminals for a burst of endocytosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Slepnev, V I -- Ochoa, G C -- Butler, M H -- Grabs, D -- De Camilli, P -- CA46128/CA/NCI NIH HHS/ -- NS36251/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1998 Aug 7;281(5378):821-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Cell Biology, Yale University School of Medicine, 295 Congress Avenue, New Haven, CT 06510, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9694653" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adaptor Protein Complex alpha Subunits ; Adaptor Protein Complex beta Subunits ; Adaptor Proteins, Vesicular Transport ; Adenosine Triphosphate/metabolism ; Animals ; Binding Sites ; Carbazoles/pharmacology ; Chromatography, Affinity ; Clathrin/*metabolism ; Cyclosporine/pharmacology ; Dimerization ; Dynamin I ; Dynamins ; *Endocytosis ; Enzyme Inhibitors/pharmacology ; GTP Phosphohydrolases/*metabolism ; Indole Alkaloids ; Membrane Proteins/*metabolism ; Nerve Tissue Proteins/*metabolism ; Phosphoric Monoester Hydrolases/*metabolism ; Rats ; Recombinant Fusion Proteins/metabolism ; src Homology Domains
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  • 53
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-10-17
    Beschreibung: Ultraviolet laser microprobe analyses of a calcium-aluminum-rich inclusion (CAI) from the Allende meteorite suggest that a line with a slope of exactly 1.00 on a plot of delta (17)O against delta (18)O represents the primitive oxygen isotope reservoir of the early solar nebula. Most meteorites are enriched in (17)O and (18)O relative to this line, and their oxygen isotope ratios can be explained by mass fractionation or isotope exchange initiating from the primitive reservoir. These data establish a link between the oxygen isotopic composition of the abundant ordinary chondrites and the primitive (16)O-rich component of CAIs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Young, E D -- Russell, S S -- New York, N.Y. -- Science. 1998 Oct 16;282(5388):452-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth Sciences, University of Oxford, UK. ed.young@earth.ox.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9841405" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Meteoroids ; *Oxygen ; Oxygen Isotopes ; *Solar System
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 54
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-02-28
    Beschreibung: Small organic sensor molecules were prepared that bind and signal the presence of unlabeled tripeptides in a sequence-selective manner. Sequence-selective peptide binding is a difficult problem because small peptides are highly flexible and there are no clear rules for designing peptide-binding molecules as there are for the nucleic acids. The signaling system involved the application of fluorescence energy transfer and provided large, real-time fluorescence increases (300 to 500 percent) upon peptide binding. With it, these sensors were sensitive enough to detect unlabeled cognate peptides both in organic solution and in the solid state at low micromolar concentrations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, C T -- Wagner, H -- Still, W C -- New York, N.Y. -- Science. 1998 Feb 6;279(5352):851-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Columbia University, New York, NY 10027, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9452382" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Binding Sites ; Energy Transfer ; Fluorescence ; Microspheres ; Oligopeptides/*analysis/metabolism ; Peptide Library ; Peptides, Cyclic/*chemical synthesis/chemistry/metabolism ; Polystyrenes ; Spectrometry, Fluorescence
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  • 55
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1999-01-05
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Normile, D -- New York, N.Y. -- Science. 1998 Dec 11;282(5396):1975-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9874644" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animal Husbandry/*methods ; Animals ; Blastocyst ; Cattle/embryology/*genetics ; Cell Differentiation ; Cells, Cultured ; *Cloning, Organism ; Embryo Transfer/veterinary ; Fallopian Tubes/cytology ; Female ; Japan ; *Nuclear Transfer Techniques ; Oocytes ; Ovarian Follicle/cytology ; Pregnancy
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 56
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-06-25
    Beschreibung: The human immunodeficiency virus-type 1 (HIV-1) envelope glycoproteins interact with receptors on the target cell and mediate virus entry by fusing the viral and cell membranes. The structure of the envelope glycoproteins has evolved to fulfill these functions while evading the neutralizing antibody response. An understanding of the viral strategies for immune evasion should guide attempts to improve the immunogenicity of the HIV-1 envelope glycoproteins and, ultimately, aid in HIV-1 vaccine development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wyatt, R -- Sodroski, J -- AI 31783/AI/NIAID NIH HHS/ -- AI 39420/AI/NIAID NIH HHS/ -- AI28691/AI/NIAID NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1998 Jun 19;280(5371):1884-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cancer Immunology/AIDS, Dana-Farber Cancer Institute, Department of Pathology, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9632381" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): AIDS Vaccines/chemistry/immunology ; Animals ; Gene Products, env/chemistry/immunology/*physiology ; HIV Antibodies/biosynthesis ; HIV Antigens/immunology ; HIV Envelope Protein gp41/physiology ; HIV Infections/*immunology ; HIV-1/chemistry/immunology/*physiology ; Humans ; Membrane Fusion ; Receptors, HIV/metabolism
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 57
    Publikationsdatum: 1998-05-23
    Beschreibung: An unresolved question in neuroscience and psychology is how the brain monitors performance to regulate behavior. It has been proposed that the anterior cingulate cortex (ACC), on the medial surface of the frontal lobe, contributes to performance monitoring by detecting errors. In this study, event-related functional magnetic resonance imaging was used to examine ACC function. Results confirm that this region shows activity during erroneous responses. However, activity was also observed in the same region during correct responses under conditions of increased response competition. This suggests that the ACC detects conditions under which errors are likely to occur rather than errors themselves.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carter, C S -- Braver, T S -- Barch, D M -- Botvinick, M M -- Noll, D -- Cohen, J D -- K08MH01306/MH/NIMH NIH HHS/ -- R01MH52864/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1998 May 1;280(5364):747-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Western Psychiatric Institute and Clinic, School of Medicine, University of Pittsburgh, 3811 O'Hara Street, Pittsburgh, PA 15213, USA. cscarter+@pitt.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9563953" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Brain Mapping ; Cognition/*physiology ; Frontal Lobe/*physiology ; Gyrus Cinguli/*physiology ; Humans ; Magnetic Resonance Imaging
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  • 58
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-12-18
    Beschreibung: During T cell activation, the engagement of costimulatory molecules is often crucial to the development of an effective immune response, but the mechanism by which this is achieved is not known. Here, it is shown that beads attached to the surface of a T cell translocate toward the interface shortly after the start of T cell activation. This movement appears to depend on myosin motor proteins and requires the engagement of the major costimulatory receptor pairs, B7-CD28 and ICAM-1-LFA-1. This suggests that the engagement of costimulatory receptors triggers an active accumulation of molecules at the interface of the T cell and the antigen-presenting cell, which then increases the overall amplitude and duration of T cell signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wulfing, C -- Davis, M M -- New York, N.Y. -- Science. 1998 Dec 18;282(5397):2266-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9856952" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Antigen Presentation ; Antigen-Presenting Cells/immunology ; Antigens, CD/*metabolism ; Antigens, CD28/metabolism ; Antigens, CD86 ; Biotinylation ; CHO Cells ; Calcium/metabolism ; Cricetinae ; Cytoskeleton/*physiology ; Intercellular Adhesion Molecule-1/metabolism ; *Lymphocyte Activation ; Lymphocyte Function-Associated Antigen-1/metabolism ; Membrane Glycoproteins/metabolism ; Mice ; Microspheres ; Molecular Motor Proteins/physiology ; Myosins/physiology ; Phosphatidylinositol 3-Kinases/metabolism ; Receptors, Antigen, T-Cell/immunology ; Signal Transduction ; T-Lymphocytes/*immunology/metabolism/ultrastructure ; Tumor Cells, Cultured
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 59
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-01-16
    Beschreibung: The dynamics of two-dimensional small-polaron formation at ultrathin alkane layers on a silver(111) surface have been studied with femtosecond time- and angle-resolved two-photon photoemission spectroscopy. Optical excitation creates interfacial electrons in quasi-free states for motion parallel to the interface. These initially delocalized electrons self-trap as small polarons in a localized state within a few hundred femtoseconds. The localized electrons then decay back to the metal within picoseconds by tunneling through the adlayer potential barrier. The energy dependence of the self-trapping rate has been measured and modeled with a theory analogous to electron transfer theory. This analysis determines the inter- and intramolecular vibrational modes of the overlayer responsible for self-trapping as well as the relaxation energy of the overlayer molecular lattice. These results for a model interface contribute to the fundamental picture of electron behavior in weakly bonded solids and can lead to better understanding of carrier dynamics in many different systems, including organic light-emitting diodes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ge -- Wong -- Lingle Jr -- McNeill -- Gaffney -- Harris -- New York, N.Y. -- Science. 1998 Jan 9;279(5348):202-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of California, Berkeley, CA 94720, USA, and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9422687" target="_blank"〉PubMed〈/a〉
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  • 60
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-12-05
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Normile, D -- New York, N.Y. -- Science. 1998 Oct 9;282(5387):213, 215.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9841381" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Communicable Diseases ; *Containment of Biohazards ; Expert Testimony ; Laboratories/*legislation & jurisprudence/standards ; *Safety ; Tokyo ; World Health Organization
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  • 61
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-06-06
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sikorski, R -- Peters, R -- New York, N.Y. -- Science. 1998 May 15;280(5366):1101.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9616082" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Gene Library ; Gene Targeting ; *Genetic Techniques ; Genetic Vectors ; Mice ; Mice, Knockout/*genetics ; Mutagenesis, Insertional ; Sequence Analysis, DNA ; *Stem Cells
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 62
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-08-14
    Beschreibung: Differential actions of acetylcholine on the excitability of two subtypes of interneurons in layer V of the rat visual cortex were examined. Acetylcholine excited low-threshold spike (LTS) cells through nicotinic receptors, whereas it elicited hyperpolarization in fast spiking (FS) cells through muscarinic receptors. Axons of LTS cells were mainly distributed vertically to upper layers, and those of FS cells were primarily confined to layer V. Thus, cortical cholinergic activation may reduce some forms of intralaminar inhibition, promote intracolumnar inhibition, and change the direction of information flow within cortical circuits.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xiang, Z -- Huguenard, J R -- Prince, D A -- NS 06477/NS/NINDS NIH HHS/ -- NS 07280/NS/NINDS NIH HHS/ -- NS 12151/NS/NINDS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1998 Aug 14;281(5379):985-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurology and Neurological Sciences, Stanford University Medical Center, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9703513" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acetylcholine/*physiology ; Animals ; Hexamethonium/pharmacology ; In Vitro Techniques ; Interneurons/physiology ; Membrane Potentials ; Muscarinic Antagonists/pharmacology ; Nerve Net/*physiology ; *Neural Inhibition ; Nicotinic Antagonists/pharmacology ; Patch-Clamp Techniques ; Rats ; Rats, Sprague-Dawley ; Receptors, Nicotinic/physiology ; Scopolamine Hydrobromide/pharmacology ; Visual Cortex/cytology/*physiology
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  • 63
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-03-21
    Beschreibung: Mice homozygous for a disrupted allele of the mismatch repair gene Pms2 have a mutator phenotype. When this allele is crossed into quasi-monoclonal (QM) mice, which have a very limited B cell repertoire, homozygotes have fewer somatic mutations at the immunoglobulin heavy chain and lambda chain loci than do heterozygotes or wild-type QM mice. That is, mismatch repair seems to contribute to somatic hypermutation rather than stifling it. It is suggested that at immunoglobulin loci in hypermutable B cells, mismatched base pairs are "corrected" according to the newly synthesized DNA strand, thereby fixing incipient mutations instead of eliminating them.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cascalho, M -- Wong, J -- Steinberg, C -- Wabl, M -- 1R01 GM37699/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1998 Feb 20;279(5354):1207-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, University of California, San Francisco, CA 94143-0670, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9469811" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Adenosine Triphosphatases ; Alleles ; Amino Acid Sequence ; Animals ; B-Lymphocytes/immunology ; Base Composition ; Base Sequence ; Cloning, Molecular ; Crosses, Genetic ; *DNA Repair ; *DNA Repair Enzymes ; *DNA-Binding Proteins ; Female ; Gene Rearrangement ; *Genes, Immunoglobulin ; Heterozygote ; Immunoglobulin Heavy Chains/chemistry/genetics ; Immunoglobulin Variable Region/chemistry/*genetics ; Immunoglobulin lambda-Chains/chemistry/genetics ; Male ; Mice ; Mice, Knockout ; Molecular Sequence Data ; *Mutation ; Proteins/*genetics/physiology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 64
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-12-05
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gearhart, J -- New York, N.Y. -- Science. 1998 Nov 6;282(5391):1061-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Gynecology and Obstetrics, Johns Hopkins Medicine, Baltimore, MD 21287, USA. gearhart@jhmi.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9841453" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Blastocyst/*cytology ; *Cell Culture Techniques ; Cell Differentiation ; *Cell Line ; Cell Lineage ; *Embryo Research ; Embryo, Mammalian/*cytology ; Federal Government ; Germ Cells/*cytology ; Government Regulation ; Guidelines as Topic ; Humans ; Major Histocompatibility Complex ; Mice ; Research Support as Topic ; Risk Assessment ; Stem Cell Transplantation ; Stem Cells/*cytology ; Transplantation Immunology ; United States
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  • 65
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-06-11
    Beschreibung: High-resolution spectroscopy of Mars' atmosphere with the Hubble Space Telescope revealed the deuterium Lyman alpha line at an intensity of 23 +/- 6 rayleighs. This measured intensity corresponds to HD/H2 = 1.5 +/- 0.6 x 10(-4), which is smaller by a factor of 11 than HDO/H2O. This indicates that fractionation of HD/H2 relative to that of HDO/H2O is not kinetically controlled by the rates of formation and destruction of H2 and HD but is thermodynamically controlled by the isotope exchange HD + H2O left and right arrow HDO + H2. Molecular hydrogen is strongly depleted in deuterium relative to water on Mars because of the very long lifetime of H2 (1200 years). The derived isotope fractionation corresponds to an estimate of a planetwide reservoir of water ice about 5 meters thick that is exchangeable with the atmosphere.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Krasnopolsky, V A -- Mumma, M J -- Gladstone, G R -- New York, N.Y. -- Science. 1998 Jun 5;280(5369):1576-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Catholic University of America, Washington, DC 20064, USA. VKras@lepvx3.gsfc.nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9616115" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Atmosphere ; Deuterium/*analysis ; *Extraterrestrial Environment ; Hydrogen/*analysis ; Ice ; *Mars ; Temperature ; *Water
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  • 66
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-03-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1998 Mar 6;279(5356):1465-82.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9508721" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Asia, Southeastern ; *Science
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 67
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-12-05
    Beschreibung: Group I introns possess a single active site that catalyzes the two sequential reactions of self-splicing. An RNA comprising the two domains of the Tetrahymena thermophila group I intron catalytic core retains activity, and the 5.0 angstrom crystal structure of this 247-nucleotide ribozyme is now described. Close packing of the two domains forms a shallow cleft capable of binding the short helix that contains the 5' splice site. The helix that provides the binding site for the guanosine substrate deviates significantly from A-form geometry, providing a tight binding pocket. The binding pockets for both the 5' splice site helix and guanosine are formed and oriented in the absence of these substrates. Thus, this large ribozyme is largely preorganized for catalysis, much like a globular protein enzyme.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Golden, B L -- Gooding, A R -- Podell, E R -- Cech, T R -- New York, N.Y. -- Science. 1998 Oct 9;282(5387):259-64.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309-0215, USA. bgolden@petunia.colorado.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9841391" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Base Pairing ; Base Sequence ; Binding Sites ; Catalysis ; Crystallography, X-Ray ; Guanosine/metabolism ; Introns ; Magnesium/metabolism ; Manganese/metabolism ; *Models, Molecular ; Molecular Sequence Data ; *Nucleic Acid Conformation ; Phosphates/metabolism ; RNA Splicing ; RNA, Catalytic/*chemistry/metabolism ; Tetrahymena thermophila/*genetics
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  • 68
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-12-05
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Soslau, G -- Rottenberg, H -- Stearns, M -- New York, N.Y. -- Science. 1998 Oct 23;282(5389):627-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9841412" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Academic Medical Centers/manpower/*organization & administration ; *Faculty ; *Faculty, Medical ; Pennsylvania ; Schools, Medical/manpower/*organization & administration
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 69
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-04-16
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chess, A -- New York, N.Y. -- Science. 1998 Mar 27;279(5359):2067-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge, MA 02142, USA. chess@wi.mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9537917" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Alleles ; Animals ; CD4-Positive T-Lymphocytes/*immunology ; DNA Replication ; *Gene Expression Regulation ; Genes, Immunoglobulin ; Interleukin-2/*genetics ; Lymphocyte Activation ; Mice ; Polymerase Chain Reaction ; Receptors, Antigen, T-Cell/metabolism ; Signal Transduction ; Transcription, Genetic
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  • 70
    Publikationsdatum: 1998-03-13
    Beschreibung: The magnetometer and electron reflectometer investigation (MAG/ER) on the Mars Global Surveyor spacecraft has obtained magnetic field and plasma observations throughout the near-Mars environment, from beyond the influence of Mars to just above the surface (at an altitude of approximately 100 kilometers). The solar wind interaction with Mars is in many ways similar to that at Venus and at an active comet, that is, primarily an ionospheric-atmospheric interaction. No significant planetary magnetic field of global scale has been detected to date (〈2 x 10(21) Gauss-cubic centimeter), but here the discovery of multiple magnetic anomalies of small spatial scale in the crust of Mars is reported.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Acuna -- Connerney -- Wasilewski -- Lin -- Anderson -- Carlson -- McFadden -- Curtis -- Mitchell -- Reme -- Mazelle -- Sauvaud -- d'Uston -- Cros -- Medale -- Bauer -- Cloutier -- Mayhew -- Winterhalter -- Ness -- New York, N.Y. -- Science. 1998 Mar 13;279(5357):1676-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉M. H. Acuna, J. E. P. Connerney, P. Wasilewski, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA. R. P. Lin, Space Sciences Laboratory and Department of Physics, University of California, Berkeley, CA 94720, USA. K. A. Anderson, C. W. Carlson, J. McFadden, D. W. Curtis, D. Mitchell, Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA. H. Reme, C. Mazelle, J. A. Sauvaud, C. d'Uston, A. Cros, J. L. Medale, Centre d'Etude Spatiale des Rayonnements, 31209 Toulouse Cedex, France. S. J. Bauer, University of Graz and Space Research Institute, A-8010 Graz, Austria. P. Cloutier, Department of Space Physics and Astronomy, Rice University, Houston, TX 77005, USA. M. Mayhew, National Science Foundation, Arlington, VA 22230, USA. D. Winterhalter, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA. N. F. Ness, Bartol Research Institute, University of Delaware, Newark, DE 19716, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9497279" target="_blank"〉PubMed〈/a〉
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  • 71
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1999-01-05
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goldman, L R -- New York, N.Y. -- Science. 1998 Dec 4;282(5395):1825-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9874633" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Child ; Environmental Exposure ; Environmental Pollutants/adverse effects ; Government Agencies ; Humans ; Lead/adverse effects ; Lead Poisoning/*prevention & control ; United States ; United States Environmental Protection Agency
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  • 72
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1999-01-05
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Spear, P G -- New York, N.Y. -- Science. 1998 Dec 11;282(5396):1999-2000.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Northwestern University Medical School, Department of Microbiology-Immunology, Chicago, IL 60611, USA. p-spear@nwu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9874652" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Bacterial Adhesion ; Cytoskeletal Proteins/genetics/*metabolism ; Dystroglycans ; Humans ; Laminin/metabolism ; Lassa Fever/*virology ; Lassa virus/*metabolism ; Leprosy/*microbiology ; Lymphocytic choriomeningitis virus/metabolism ; Membrane Glycoproteins/genetics/*metabolism ; Models, Biological ; Mycobacterium leprae/*metabolism ; Receptors, Virus/metabolism ; Schwann Cells/microbiology
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  • 73
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-07-10
    Beschreibung: The solidus of a pyrolite-like composition, approximating that of the lower mantle, was measured up to 59 gigapascals by using CO2 laser heating in a diamond anvil cell. The solidus temperatures are at least 700 kelvin below the melting temperatures of magnesiowustite, which in the deep mantle has the lowest melting temperatures of the three major components-magnesiowustite, Mg-Si-perovskite, and Ca-Si-perovskite. The solidus in the deep mantle is more than 1500 kelvin above the average present-day geotherm, but at the core-mantle boundary it is near the core temperature. Thus, partial melting of the mantle is possible at the core-mantle boundary.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zerr -- Diegeler -- Boehler -- New York, N.Y. -- Science. 1998 Jul 10;281(5374):243-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉A. Zerr and R. Boehler, Max-Planck-Institut fur Chemie, Postfach 3060, 55020 Mainz, Germany. A. Diegeler, Institut fur Mineralogie und Geochemie der Universitat zu Koln, 50674 Koln, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9657715" target="_blank"〉PubMed〈/a〉
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  • 74
    Publikationsdatum: 1998-08-07
    Beschreibung: Inelastic light scattering by low-energy spin-excitations reveals three distinct configurations of spin of electron double layers in gallium arsenide quantum wells at even-integer quantum Hall states. The transformations among these spin states appear as quantum phase transitions driven by the interplay between Coulomb interactions and Zeeman splittings. One of the transformations correlates with the emergence of a spin-flip intersubband excitation at vanishingly low energy and provides direct evidence of a link between quantum phase transitions and soft collective excitations in a two-dimensional electron system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pellegrini V -- Pinczuk -- Dennis -- Plaut -- Pfeiffer -- West -- New York, N.Y. -- Science. 1998 Aug 7;281(5378):799-802.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉V. Pellegrini, Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA, and Scuola Normale Superiore and Istituto Nazionale per la Fisica della Materia, Pisa, Italy. A. Pinczuk, Bell Laboratories, Lucent Technologies, Murray Hill.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9694645" target="_blank"〉PubMed〈/a〉
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  • 75
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-07-31
    Beschreibung: Lizard and spider populations were censused immediately before and after Hurricane Lili on islands differentially affected by the storm surge. The results support three general propositions. First, the larger organisms, lizards, are more resistant to the immediate impact of moderate disturbance, whereas the more prolific spiders recover faster. Second, extinction risk is related to population size when disturbance is moderate but not when it is catastrophic. Third, after catastrophic disturbance, the recovery rate among different types of organisms is related to dispersal ability. The absence of the poorer dispersers, lizards, from many suitable islands is probably the result of long-lasting effects of catastrophes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Spiller -- Losos -- Schoener -- New York, N.Y. -- Science. 1998 Jul 31;281(5377):695-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9685262" target="_blank"〉PubMed〈/a〉
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  • 76
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-07-10
    Beschreibung: The 2.5 angstrom resolution x-ray crystal structure of the Escherichia coli RNA polymerase (RNAP) alpha subunit amino-terminal domain (alphaNTD), which is necessary and sufficient to dimerize and assemble the other RNAP subunits into a transcriptionally active enzyme and contains all of the sequence elements conserved among eukaryotic alpha homologs, has been determined. The alphaNTD monomer comprises two distinct, flexibly linked domains, only one of which participates in the dimer interface. In the alphaNTD dimer, a pair of helices from one monomer interact with the cognate helices of the other to form an extensive hydrophobic core. All of the determinants for interactions with the other RNAP subunits lie on one face of the alphaNTD dimer. Sequence alignments, combined with secondary-structure predictions, support proposals that a heterodimer of the eukaryotic RNAP subunits related to Saccharomyces cerevisiae Rpb3 and Rpb11 plays the role of the alphaNTD dimer in prokaryotic RNAP.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, G -- Darst, S A -- GM19441-01/GM/NIGMS NIH HHS/ -- GM53759/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1998 Jul 10;281(5374):262-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9657722" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acid Sequence ; Crystallography, X-Ray ; DNA-Directed RNA Polymerases/*chemistry ; Dimerization ; Escherichia coli/*enzymology ; Models, Molecular ; Molecular Sequence Data ; *Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; RNA Polymerase II/chemistry ; *Saccharomyces cerevisiae Proteins ; Sequence Alignment
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  • 77
    Publikationsdatum: 1998-02-28
    Beschreibung: In the adult mouse, single and compound null mutations in the genes for retinoic acid receptor beta and retinoid X receptors beta and gamma resulted in locomotor defects related to dysfunction of the mesolimbic dopamine signaling pathway. Expression of the D1 and D2 receptors for dopamine was reduced in the ventral striatum of mutant mice, and the response of double null mutant mice to cocaine, which affects dopamine signaling in the mesolimbic system, was blunted. Thus, retinoid receptors are involved in the regulation of brain functions, and retinoic acid signaling defects may contribute to pathologies such as Parkinson's disease and schizophrenia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Krezel, W -- Ghyselinck, N -- Samad, T A -- Dupe, V -- Kastner, P -- Borrelli, E -- Chambon, P -- New York, N.Y. -- Science. 1998 Feb 6;279(5352):863-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut de Genetique et de Biologie Moleculaire et Cellulaire, CNRS, INSERM, Universite Louis Pasteur, College de France, Boite Postale 163, 67404 Illkirch Cedex, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9452386" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cocaine/pharmacology ; Corpus Striatum/*metabolism ; Dimerization ; Dopamine/*metabolism ; Locomotion ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Knockout ; *Motor Activity/drug effects ; Muscle, Skeletal/physiology ; Parkinson Disease/etiology ; Peripheral Nervous System/physiology ; Receptors, Dopamine D1/genetics/metabolism ; Receptors, Dopamine D2/genetics/metabolism ; Receptors, Retinoic Acid/genetics/*physiology ; Retinoid X Receptors ; Schizophrenia/etiology ; *Signal Transduction ; Transcription Factors/genetics/*physiology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 78
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-04-16
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sikorski, R -- Peters, R -- New York, N.Y. -- Science. 1998 Mar 20;279(5358):1967-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9537908" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Biochemistry/*methods ; Carbocyanines ; DNA/metabolism ; Deoxyribonuclease EcoRI/*metabolism ; Fluorescent Dyes ; Rhodamines ; Spectrometry, Fluorescence/*methods
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 79
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-02-07
    Beschreibung: The development of plant root systems is sensitive to the availability and distribution of nutrients within the soil. For example, lateral roots proliferate preferentially within nitrate (NO3-)-rich soil patches. A NO3--inducible Arabidopsis gene (ANR1), was identified that encodes a member of the MADS box family of transcription factors. Transgenic plants in which ANR1 was repressed had an altered sensitivity to NO3- and no longer responded to NO3--rich zones by lateral root proliferation, indicating that ANR1 is a key determinant of developmental plasticity in Arabidopsis roots.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, H -- Forde, B G -- New York, N.Y. -- Science. 1998 Jan 16;279(5349):407-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biochemistry and Physiology Department, IACR-Rothamsted, Harpenden, Herts AL5 2JQ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9430595" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Arabidopsis/*genetics/growth & development/metabolism ; *Arabidopsis Proteins ; DNA-Binding Proteins/*genetics/physiology ; Gene Expression Regulation, Plant ; *Genes, Plant ; MADS Domain Proteins ; Molecular Sequence Data ; Nitrates/metabolism/*pharmacology ; Plant Proteins/*genetics/physiology ; Plant Roots/genetics/*growth & development/metabolism ; Plants, Genetically Modified ; Transcription Factors/*genetics/physiology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 80
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-04-16
    Beschreibung: When contacts are first forming in the developing nervous system, many neurons generate spontaneous activity that has been hypothesized to shape appropriately patterned connections. In Mustela putorius furo, monocular intraocular blockade of spontaneous retinal waves of action potentials by cholinergic agents altered the subsequent eye-specific lamination pattern of the lateral geniculate nucleus (LGN). The projection from the active retina was greatly expanded into territory normally belonging to the other eye, and the projection from the inactive retina was substantially reduced. Thus, interocular competition driven by endogenous retinal activity determines the pattern of eye-specific connections from retina to LGN, demonstrating that spontaneous activity can produce highly stereotyped patterns of connections before the onset of visual experience.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Penn, A A -- Riquelme, P A -- Feller, M B -- Shatz, C J -- MH 98108/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1998 Mar 27;279(5359):2108-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA. apenn@uclink2.berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9516112" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Action Potentials/drug effects ; Animals ; Animals, Newborn ; Axons/physiology ; Bicyclo Compounds, Heterocyclic/pharmacology ; Bungarotoxins/pharmacology ; *Conotoxins ; Ferrets ; Geniculate Bodies/*anatomy & histology/growth & development ; Microspheres ; Nicotinic Agonists/pharmacology ; Peptides/pharmacology ; Pyridines/pharmacology ; Retina/drug effects/*physiology ; Retinal Ganglion Cells/drug effects/*physiology ; *Visual Pathways
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 81
    Publikationsdatum: 1998-12-18
    Beschreibung: CTLA-4, a negative regulator of T cell function, was found to associate with the T cell receptor (TCR) complex zeta chain in primary T cells. The association of TCRzeta with CTLA-4, reconstituted in 293 transfectants, was enhanced by p56(lck)-induced tyrosine phosphorylation. Coexpression of the CTLA-4-associated tyrosine phosphatase, SHP-2, resulted in dephosphorylation of TCRzeta bound to CTLA-4 and abolished the p56(lck)-inducible TCRzeta-CTLA-4 interaction. Thus, CTLA-4 inhibits TCR signal transduction by binding to TCRzeta and inhibiting tyrosine phosphorylation after T cell activation. These findings have broad implications for the negative regulation of T cell function and T cell tolerance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, K M -- Chuang, E -- Griffin, M -- Khattri, R -- Hong, D K -- Zhang, W -- Straus, D -- Samelson, L E -- Thompson, C B -- Bluestone, J A -- P01 AI35294-6/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1998 Dec 18;282(5397):2263-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ben May Institute for Cancer Research, and Committee on Immunology, University of Chicago, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9856951" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Abatacept ; Animals ; Antigens, CD ; Antigens, Differentiation/*metabolism ; CTLA-4 Antigen ; Cell Line ; Cells, Cultured ; Humans ; *Immunoconjugates ; Intracellular Signaling Peptides and Proteins ; *Lymphocyte Activation ; Lymphocyte Specific Protein Tyrosine Kinase p56(lck)/genetics/metabolism ; Membrane Proteins/*metabolism ; Mice ; Mice, Inbred BALB C ; Models, Immunological ; Phosphorylation ; Phosphotyrosine/metabolism ; Protein Tyrosine Phosphatase, Non-Receptor Type 11 ; Protein Tyrosine Phosphatase, Non-Receptor Type 6 ; Protein Tyrosine Phosphatases/genetics/metabolism ; Receptors, Antigen, T-Cell/*metabolism ; Recombinant Fusion Proteins/metabolism ; SH2 Domain-Containing Protein Tyrosine Phosphatases ; *Signal Transduction ; T-Lymphocytes/*immunology ; Transfection ; src Homology Domains
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 82
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-04-02
    Beschreibung: Experiments show how product pathways can be controlled by irradiation with one or more laser beams during individual bimolecular collisions or during unimolecular decompositions. For bimolecular collisions, control has been achieved by selective excitation of reagent vibrational modes, by control of reagent approach geometry, and by control of orbital alignment. For unimolecular reactions, control has been achieved by quantum interference between different reaction pathways connecting the same initial and final states and by adjusting the temporal shape and spectral content of ultrashort, chirped pulses of radiation. These collision-control experiments deeply enrich the understanding of how chemical reactions occur.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zare -- New York, N.Y. -- Science. 1998 Mar 20;279(5358):1875-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The author is in the Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA. E-mail: zare@stanford.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9506928" target="_blank"〉PubMed〈/a〉
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 83
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-11-20
    Beschreibung: A continuous seawater sulfate sulfur isotope curve for the Cenozoic with a resolution of approximately 1 million years was generated using marine barite. The sulfur isotopic composition decreased from 19 to 17 per mil between 65 and 55 million years ago, increased abruptly from 17 to 22 per mil between 55 and 45 million years ago, remained nearly constant from 35 to approximately 2 million years ago, and has decreased by 0.8 per mil during the past 2 million years. A comparison between seawater sulfate and marine carbonate carbon isotope records reveals no clear systematic coupling between the sulfur and carbon cycles over one to several millions of years, indicating that changes in the burial rate of pyrite sulfur and organic carbon did not singularly control the atmospheric oxygen content over short time intervals in the Cenozoic. This finding has implications for the modeling of controls on atmospheric oxygen concentration.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Paytan -- Kastner -- Campbell -- Thiemens -- New York, N.Y. -- Science. 1998 Nov 20;282(5393):1459-62.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉A. Paytan, M. Kastner, and D. Campbell are in the Geosciences Research Division, Scripps Institution of Oceanography, 9500 Gilman Drive, La Jolla, CA 92093, USA. M. H. Thiemens is in the Chemistry Department, University of California, San Dieg.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9822370" target="_blank"〉PubMed〈/a〉
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 84
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-02-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goldman, L R -- Farland, W H -- New York, N.Y. -- Science. 1998 Jan 30;279(5351):640-1; author reply 641.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9471723" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Fishes ; *Food Contamination ; Humans ; Maximum Allowable Concentration ; Methylmercury Compounds/*adverse effects ; *Nutrition Policy ; Risk Assessment ; United States ; United States Environmental Protection Agency
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 85
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-06-25
    Beschreibung: A cluster analysis of the stratigraphic distribution of all Ordovician trilobite families, based on a comprehensive taxonomic database, identified two major faunas with disjunct temporal diversity trends. The Ibex Fauna behaved as a cohort, declining through the Ordovician and disappearing at the end-Ordovician mass extinction. In contrast, the Whiterock Fauna radiated rapidly during the Middle Ordovician and gave rise to all post-Ordovician trilobite diversity. Its pattern of diversification matches that of the Paleozoic Evolutionary Fauna; hence, trilobites were active participants in the great Ordovician radiations. Extinction patterns at the end of the Ordovician are related to clade size: Surviving trilobite families show higher genus diversity than extinguished families.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Adrain -- Fortey -- Westrop -- New York, N.Y. -- Science. 1998 Jun 19;280(5371):1922-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉J. M. Adrain and R. A. Fortey, Department of Palaeontology, Natural History Museum, Cromwell Road, London SW7 5BD, UK. S. R. Westrop, Oklahoma Museum of Natural History and School of Geology and Geophysics, University of Oklahoma, Norman, OK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9632387" target="_blank"〉PubMed〈/a〉
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 86
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1999-01-05
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gough, M -- New York, N.Y. -- Science. 1998 Dec 4;282(5395):1823.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9874631" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): 2,4,5-Trichlorophenoxyacetic Acid/adverse effects ; 2,4-Dichlorophenoxyacetic Acid/adverse effects ; Confidentiality/*legislation & jurisprudence ; Defoliants, Chemical ; Financing, Government ; Humans ; *Public Policy ; Research/*legislation & jurisprudence ; *Research Support as Topic ; Tetrachlorodibenzodioxin/adverse effects ; United States
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 87
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-06-05
    Beschreibung: An unexpected three-stage melting transition has been observed in two-dimensional (2D) free-standing liquid-crystal films by in situ electron-diffraction and optical-reflectivity measurements. These data suggest the existence of two phases between the 2D solid and liquid: a hexatic phase and, at a higher temperature, an intermediate liquid phase with hexatic-like positional correlations ( approximately 40 angstroms) but no long-range orientational order. Previous high-resolution heat-capacity measurements have revealed a divergent-like anomaly at the hexatic-liquid transition that sharply contradicts the predictions of 2D melting theories. The observation of an intermediate isotropic phase may alter our understanding of 2D melting and lead to reconciliation between current experiments and theories.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chou -- Jin -- Hui -- Huang -- Ho -- New York, N.Y. -- Science. 1998 May 29;280(5368):1424-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉C.-F. Chou, Department of Physics, Princeton University, Princeton, NJ 08544, USA. A. J. Jin, Applied Materials, 3320 Scott Boulevard, Mailstop 1114, Santa Clara, CA 95054, USA. S. W. Hui, Department of Biophysics, Roswell Park Cancer Institute, Buf.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9603729" target="_blank"〉PubMed〈/a〉
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 88
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-11-20
    Beschreibung: Two general models have been proposed for DNA replication. In one model, DNA polymerase moves along the DNA (like a train on a track); in the other model, the polymerase is stationary (like a factory), and DNA is pulled through. To distinguish between these models, we visualized DNA polymerase of the bacterium Bacillus subtilis in living cells by the creation of a fusion protein containing the catalytic subunit (PolC) and green fluorescent protein (GFP). PolC-GFP was localized at discrete intracellular positions, predominantly at or near midcell, rather than being distributed randomly. These results suggest that the polymerase is anchored in place and thus support the model in which the DNA template moves through the polymerase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lemon, K P -- Grossman, A D -- GM41934/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1998 Nov 20;282(5393):1516-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Building 68-530, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9822387" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Bacillus subtilis/enzymology/growth & development/*metabolism ; Chromosomes, Bacterial/*metabolism ; *DNA Replication ; DNA, Bacterial/*biosynthesis ; DNA-Directed DNA Polymerase/*analysis/metabolism ; Green Fluorescent Proteins ; Luminescent Proteins ; Models, Biological ; Recombinant Fusion Proteins/metabolism ; *Replication Origin ; Templates, Genetic
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 89
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-10-24
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Leigh, S R -- New York, N.Y. -- Science. 1998 Oct 2;282(5386):47.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9786794" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Humans ; Pan troglodytes/*genetics/*growth & development ; Research
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 90
    Publikationsdatum: 1998-02-21
    Beschreibung: CREB binding protein (CBP) functions as an essential coactivator of transcription factors that are inhibited by the adenovirus early gene product E1A. Transcriptional activation by the signal transducer and activator of transcription-1 (STAT1) protein requires the C/H3 domain in CBP, which is the primary target of E1A inhibition. Here it was found that the C/H3 domain is not required for retinoic acid receptor (RAR) function, nor is it involved in E1A inhibition. Instead, E1A inhibits RAR function by preventing the assembly of CBP-nuclear receptor coactivator complexes, revealing differences in required CBP domains for transcriptional activation by RAR and STAT1.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kurokawa, R -- Kalafus, D -- Ogliastro, M H -- Kioussi, C -- Xu, L -- Torchia, J -- Rosenfeld, M G -- Glass, C K -- New York, N.Y. -- Science. 1998 Jan 30;279(5351):700-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Cellular and Molecular Medicine, Department of Medicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0651, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9445474" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adenovirus E1A Proteins/*metabolism/pharmacology ; Animals ; Binding Sites ; CREB-Binding Protein ; Cell Differentiation ; Cell Line ; DNA-Binding Proteins/metabolism ; Histone Acetyltransferases ; Humans ; Mutation ; Nuclear Proteins/chemistry/genetics/*metabolism ; Nuclear Receptor Coactivator 1 ; Nuclear Receptor Coactivator 3 ; Protein Binding ; Receptors, Retinoic Acid/metabolism ; Recombinant Fusion Proteins/metabolism ; STAT1 Transcription Factor ; Trans-Activators/metabolism ; Transcription Factors/chemistry/genetics/*metabolism ; *Transcription, Genetic ; Transcriptional Activation ; Tretinoin/pharmacology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 91
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-07-31
    Beschreibung: Protein trafficking from the endoplasmic reticulum (ER) to the Golgi apparatus involves specific uptake into coat protein complex II (COPII)-coated vesicles of secretory and of vesicle targeting (v-SNARE) proteins. Here, two ER to Golgi v-SNAREs, Bet1p and Bos1p, were shown to interact specifically with Sar1p, Sec23p, and Sec24p, components of the COPII coat, in a guanine nucleotide-dependent fashion. Other v-SNAREs, Sec22p and Ykt6p, might interact more weakly with the COPII coat or interact indirectly by binding to Bet1p or Bos1p. The data suggest that transmembrane proteins can be taken up into COPII vesicles by direct interactions with the coat proteins and may play a structural role in the assembly of the COPII coat complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Springer, S -- Schekman, R -- New York, N.Y. -- Science. 1998 Jul 31;281(5377):698-700.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA 94720-3202, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9685263" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Binding Sites ; COP-Coated Vesicles ; Carrier Proteins/*metabolism ; Endoplasmic Reticulum/*metabolism ; Fungal Proteins/*metabolism ; GTP Phosphohydrolases/metabolism ; GTP-Binding Proteins/*metabolism ; GTPase-Activating Proteins ; Golgi Apparatus/*metabolism ; Guanosine Diphosphate/metabolism ; Guanosine Triphosphate/metabolism ; Guanylyl Imidodiphosphate/metabolism/pharmacology ; Membrane Proteins/*metabolism ; *Membrane Transport Proteins ; *Monomeric GTP-Binding Proteins ; Qb-SNARE Proteins ; Qc-SNARE Proteins ; R-SNARE Proteins ; Receptors, Cell Surface/metabolism ; Recombinant Fusion Proteins/metabolism ; SNARE Proteins ; Saccharomyces cerevisiae ; *Saccharomyces cerevisiae Proteins ; *Vesicular Transport Proteins
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 92
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-05-23
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gibbons, A -- New York, N.Y. -- Science. 1998 May 1;280(5364):675-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9599143" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Biological Evolution ; *Evolution, Molecular ; Fossils ; History, Ancient ; Mammals/*genetics ; *Paleontology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 93
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-10-10
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Olshansky, S J -- Carnes, B A -- Cassel, C -- New York, N.Y. -- Science. 1998 Sep 11;281(5383):1612-3; author reply 1613-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9767025" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Forecasting ; Humans ; Life Expectancy/*trends ; *Longevity ; Mortality/*trends
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 94
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-09-25
    Beschreibung: Highly luminescent semiconductor quantum dots (zinc sulfide-capped cadmium selenide) have been covalently coupled to biomolecules for use in ultrasensitive biological detection. In comparison with organic dyes such as rhodamine, this class of luminescent labels is 20 times as bright, 100 times as stable against photobleaching, and one-third as wide in spectral linewidth. These nanometer-sized conjugates are water-soluble and biocompatible. Quantum dots that were labeled with the protein transferrin underwent receptor-mediated endocytosis in cultured HeLa cells, and those dots that were labeled with immunomolecules recognized specific antibodies or antigens.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chan, W C -- Nie, S -- New York, N.Y. -- Science. 1998 Sep 25;281(5385):2016-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Indiana University, Bloomington, IN 47405, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9748158" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Cadmium Compounds/chemistry ; Endocytosis ; *Fluorescent Antibody Technique ; *Fluorescent Dyes ; HeLa Cells ; Humans ; Luminescence ; Molecular Probe Techniques ; Particle Size ; Receptors, Transferrin/metabolism ; *Selenium Compounds/chemistry ; *Semiconductors ; Solubility ; *Sulfides/chemistry ; Transferrin/metabolism ; *Zinc Compounds/chemistry
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 95
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-05-02
    Beschreibung: Dipterous insects (the true flies) have a sophisticated pair of equilibrium organs called halteres that evolved from hind wings. The halteres are sensitive to Coriolis forces that result from angular rotations of the body and mediate corrective reflexes during flight. Like the aerodynamically functional fore wings, the halteres beat during flight and are equipped with their own set of control muscles. It is shown that motoneurons innervating muscles of the haltere receive strong excitatory input from directionally sensitive visual interneurons. Visually guided flight maneuvers of flies may be mediated in part by efferent modulation of hard-wired equilibrium reflexes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chan, W P -- Prete, F -- Dickinson, M H -- New York, N.Y. -- Science. 1998 Apr 10;280(5361):289-92.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Integrative Biology, University of California, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9535659" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Diptera/anatomy & histology/*physiology ; Female ; Flight, Animal/*physiology ; Interneurons/*physiology ; Male ; Mechanoreceptors/physiology ; Motor Neurons/*physiology ; Muscle, Skeletal/innervation/physiology ; Photoreceptor Cells, Invertebrate/*physiology ; Reflex/physiology ; Wings, Animal/anatomy & histology/innervation/*physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 96
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-09-28
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kyrpides, N C -- Ouzounis, C A -- New York, N.Y. -- Science. 1998 Sep 4;281(5382):1457.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9750114" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Base Sequence ; *Genes, Archaeal ; Open Reading Frames ; Publishing/*standards ; *Review Literature as Topic ; Sequence Analysis, DNA/*standards
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 97
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-05-23
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Singer, R H -- New York, N.Y. -- Science. 1998 May 1;280(5364):696-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anatomy and Structural Biology, Institute for Molecular Medicine, Albert Einstein College of Medicine, Bronx, NY 10461, USA. rhsinger@aecom.yu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9599147" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): CELF1 Protein ; Cell Nucleus/metabolism ; Exons ; Humans ; Models, Genetic ; Myotonic Dystrophy/*genetics/metabolism ; Myotonin-Protein Kinase ; Protein Binding ; Protein-Serine-Threonine Kinases/*genetics ; *RNA Splicing ; RNA, Messenger/*genetics ; RNA-Binding Proteins/genetics/*metabolism ; Ribonucleoproteins/genetics/*metabolism ; Transcription, Genetic ; Transfection ; *Trinucleotide Repeats ; Troponin/genetics ; Troponin T
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 98
    Publikationsdatum: 1998-04-16
    Beschreibung: FADD (also known as Mort-1) is a signal transducer downstream of cell death receptor CD95 (also called Fas). CD95, tumor necrosis factor receptor type 1 (TNFR-1), and death receptor 3 (DR3) did not induce apoptosis in FADD-deficient embryonic fibroblasts, whereas DR4, oncogenes E1A and c-myc, and chemotherapeutic agent adriamycin did. Mice with a deletion in the FADD gene did not survive beyond day 11.5 of embryogenesis; these mice showed signs of cardiac failure and abdominal hemorrhage. Chimeric embryos showing a high contribution of FADD null mutant cells to the heart reproduce the phenotype of FADD-deficient mutants. Thus, not only death receptors, but also receptors that couple to developmental programs, may use FADD for signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yeh, W C -- de la Pompa, J L -- McCurrach, M E -- Shu, H B -- Elia, A J -- Shahinian, A -- Ng, M -- Wakeham, A -- Khoo, W -- Mitchell, K -- El-Deiry, W S -- Lowe, S W -- Goeddel, D V -- Mak, T W -- CA13106/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1998 Mar 20;279(5358):1954-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Amgen Institute, University of Toronto, Toronto, Ontario, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9506948" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Adaptor Proteins, Signal Transducing ; Animals ; Antigens, CD95/genetics/physiology ; *Apoptosis ; Carrier Proteins/genetics/*physiology ; Cell Transformation, Neoplastic ; Cells, Cultured ; Doxorubicin/pharmacology ; *Embryonic and Fetal Development ; Endothelium, Vascular/embryology ; Fas-Associated Death Domain Protein ; Female ; Gene Expression ; Gene Targeting ; Heart/*embryology ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Transgenic ; Mutation ; Oncogenes ; Receptors, Tumor Necrosis Factor/genetics/physiology ; Signal Transduction ; Tumor Necrosis Factor-alpha/pharmacology
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    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 99
    Publikationsdatum: 1998-05-23
    Beschreibung: To test the hypothesis that actin dysfunction leads to heart failure, patients with hereditary idiopathic dilated cardiomyopathy (IDC) were examined for mutations in the cardiac actin gene (ACTC). Missense mutations in ACTC that cosegregate with IDC were identified in two unrelated families. Both mutations affect universally conserved amino acids in domains of actin that attach to Z bands and intercalated discs. Coupled with previous data showing that dystrophin mutations also cause dilated cardiomyopathy, these results raise the possibility that defective transmission of force in cardiac myocytes is a mechanism underlying heart failure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Olson, T M -- Michels, V V -- Thibodeau, S N -- Tai, Y S -- Keating, M T -- 5-P50-HL-53773/HL/NHLBI NIH HHS/ -- M01-RR00064/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1998 May 1;280(5364):750-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pediatrics, Division of Cardiology, University of Utah Health Sciences Center, Salt Lake City, UT 84112, USA. timo@howard.genetics.utah.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9563954" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Actins/chemistry/*genetics/physiology ; Adolescent ; Adult ; Cardiomyopathy, Dilated/*genetics/metabolism/pathology ; Child ; Child, Preschool ; Chromosomes, Human, Pair 15 ; Exons ; Female ; Heart/physiopathology ; Humans ; Male ; *Mutation ; Myocardium/chemistry/pathology ; Pedigree ; Phenotype ; Polymorphism, Single-Stranded Conformational ; Protein Conformation ; Sarcomeres/physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 100
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1998-08-07
    Beschreibung: The red clover necrotic mosaic virus genome is composed of two single-stranded RNA components, RNA-1 and RNA-2. The viral capsid protein is translated from a subgenomic RNA (sgRNA) that is transcribed from genomic RNA-1. Here, a 34-nucleotide sequence in RNA-2 is shown to be required for transcription of sgRNA. Mutations that prevent base-pairing between the RNA-1 subgenomic promoter and the 34-nucleotide trans-activator prevent expression of a reporter gene. A model is proposed in which direct binding of RNA-2 to RNA-1 trans-activates sgRNA synthesis. This RNA-mediated regulation of transcription is unusual among RNA viruses, which typically rely on protein regulators.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sit, T L -- Vaewhongs, A A -- Lommel, S A -- New York, N.Y. -- Science. 1998 Aug 7;281(5378):829-32.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695-7616, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9694655" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Base Composition ; Base Sequence ; DNA, Complementary ; Gene Expression ; Genes, Reporter ; Green Fluorescent Proteins ; Luminescent Proteins/genetics ; Models, Genetic ; Molecular Sequence Data ; Mosaic Viruses/*genetics ; Mutation ; Nucleic Acid Conformation ; Promoter Regions, Genetic ; RNA, Double-Stranded/genetics/metabolism ; RNA, Messenger/biosynthesis/genetics ; RNA, Viral/biosynthesis/chemistry/*genetics ; Sequence Alignment ; *Transcriptional Activation
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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