Results 251 to 260 of about 107,478 (303)

Biogeochemistry

2011
The concept of biogeochemistry is about one hundred years old. It was first defined by the Russian scientist Vernadsky in 1926. At the beginning of the twentieth century, scientific disciplines divided themselves into many subdisciplines: specialization was the credo.
Laane, R.W.P.M., Middelburg, J.J.
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The Physiology and Biogeochemistry of SUP05

Annual Review of Marine Science, 2022
The SUP05 clade of gammaproteobacteria (Thioglobaceae) comprises both primary producers and primary consumers of organic carbon in the oceans. Host-associated autotrophs are a principal source of carbon and other nutrients for deep-sea eukaryotes at hydrothermal vents, and their free-living relatives are a primary source of organic matter in seawater ...
Robert M, Morris, Rachel L, Spietz
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A molecular dawn for biogeochemistry

Trends in Ecology & Evolution, 2006
Biogeochemistry is at the dawn of an era in which molecular advances enable the discovery of novel microorganisms having unforeseen metabolic capabilities, revealing new insight into the underlying processes regulating elemental cycles at local to global scales.
Donald R, Zak   +2 more
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Biogeochemistry and Cycling of Lead

2005
Lead has no biological function and is one of the most toxic metals. At the same time, it is one of the most useful, and perhaps no other metal has found such a wide range of industrial applications. It has been used extensively since Antiquity, which is when environmental Pb contamination began.
William, Shotyk, Gaël, Le Roux
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Biogeochemistry of Sulfur Isotopes

Reviews in Mineralogy and Geochemistry, 2001
Sulfur, with an atomic weight of 32.06, has four stable isotopes. By far the most abundant is 32S, representing around 95% of the total sulfur on Earth. The next most abundant isotope is 34S, followed by 33S, and finally 36S is the least abundant contributing only 0.0136% to the total (Table 1⇓). The natural abundances of sulfur isotopes, however, vary
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Biogeochemistry of Dihydrogen (H2)

2005
Hydrogen has had an important and evolving role in Earth's geo- and biogeochemistry, from prebiotic to modern times. On the earliest Earth, abiotic sources of H2 were likely stronger than in the present. Volcanic out-gassing and hydrothermal circulation probably occurred at several times the modern rate, due to presumably higher heat flux.
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Biogeochemistry

Science, 1963
R G, Bader, F F, Koczy
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Background physics and biogeochemistry

2011
Conservation equations can be formulated for most aquatic properties \((\phi)\); for transient three-dimensional problems, the general differential equation is: $$\frac{\partial}{\partial t}\phi+U_i\frac{\partial \phi}{\partial x_i}=S_\phi\ {\rm where}\ i\,=\,x,y,z $$ (2.1) where \( \phi \) could be, for example, momentum, temperature ...
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