Results 11 to 20 of about 519,930 (304)
Evolution of the ocean's "biological pump". [PDF]
Proc Natl Acad Sci U S A, 2011 Earth history is punctuated by a huge variety of transitions and perturbations in climate and global biogeochemical cycles. These may be linked to major extinctions or evolutionary innovations, and may exhibit evidence for greenhouse warming and CO2 release and hence potentially hold direct future-relevant information (1) or may be associated with ice ...
Ridgwell A.
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Vertically migrating Isoxys and the early Cambrian biological pump. [PDF]
Proc Biol Sci, 2021 The biological pump is crucial for transporting nutrients fixed by surface-dwelling primary producers to demersal animal communities. Indeed, the establishment of an efficient biological pump was likely a key factor enabling the diversification of animals over 500 Myr ago during the Cambrian explosion.
Pates S, Daley AC, Legg DA, Rahman IA.
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Ion pumps as biological targets for decavanadate [PDF]
Dalton Transactions, 2013 The putative applications of poly-, oligo- and mono-oxometalates in biochemistry, biology, pharmacology and medicine are rapidly attracting interest. In particular, these compounds may act as potent ion pump inhibitors and have the potential to play a role in the treatment of e.g. ulcers, cancer and ischemic heart disease.
Manuel, Aureliano +2 more
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Metrics that matter for assessing the ocean biological carbon pump [PDF]
, 2020 © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Buesseler, K. O., Boyd, P. W., Black, E. E., & Siegel, D. A.
Black, Erin E. +3 more
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A New Radiotracer for Particulate Carbon Dynamics: Examination of 210Bi‐210Pb in Seawater
Geochemistry, Geophysics, Geosystems, 2022 210Bi (t1/2 = 5.01 d) is theoretically a radionuclide for tracing the particle cycle over a timescale of hours to days. However, it has been rarely investigated in marine environments due to its very short half‐life and low activity.
Weifeng Yang +4 more
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The deformation of marine snow enables its disaggregation in simulated oceanic shear
Frontiers in Marine Science, 2023 Understanding the effect of hydrodynamics on aggregate size and structure is key to predicting mass transport in the aquatic environment. Aggregation theory of particles is well established but our knowledge of deformation processes, biological bonding ...
Yixuan Song +2 more
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Entropy-Driven Pumping in Zeolites and Biological Channels [PDF]
Physical Review Letters, 1999 When two binary solutions are separated by a permeable barrier, the individual species typically diffuse and mix, dissipating their chemical potential gradients. However, we use model lattice simulations to show that single-file molecular-sized channels (such biomembrane channels and zeolites) can exhibit diffusional pumping, where one type of particle
Chou, Tom, Lohse, Detlef
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Ultrafast High-pressure AC Electro-osmotic Pumps for Portable Biomedical Microfluidics [PDF]
, 2009 This paper details the development of an integrated AC electro-osmotic (ACEO) microfluidic pump for dilute electrolytes consisting of a long serpentine microchannel lined with three dimensional (3D) stepped electrode arrays.
Bazant, Martin Z. +2 more
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Nature, 1967 THE recent exchange between Woolhouse1 and Popper2 presents the enigma of the low entropy content of living systems. The means whereby their rapid decay into the inert state of “equilibrium” is avoided are serious problems to the theoretical biologist. It is, of course, to Schrodinger3 that we owe the classic analysis of biological entropy.
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Biological Proton Pumping in an Oscillating Electric Field [PDF]
Physical Review Letters, 2009 Time-dependent external perturbations provide powerful probes of the function of molecular machines. Here we study biological proton pumping in an oscillating electric field. The protein cytochrome c oxidase is the main energy transducer in aerobic life, converting chemical energy into an electric potential by pumping protons across a membrane.
Kim, Y. +2 more
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