Results 261 to 270 of about 517,075 (314)

Determination of total phosphorus in lake sediments

Hydrobiologia, 2012
Several methods are in use to measure total phosphorus in lake sediments making cross-study comparisons tenuous, and may lead to potential errors in calculating other phosphorus fractions. Four methods in common use in the limnological literature were compared using sediments spanning a range of organic content from 2 to 35% C.
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Sediment and total phosphorous contributors in Rock River watershed

Journal of Environmental Management, 2014
Total phosphorous (TP) and total suspended sediment (TSS) pollution is a problem in the US Midwest and is of particular concern in the Great Lakes region where many water bodies are already eutrophic. Increases in monoculture corn planting to feed ethanol based biofuel production could exacerbate these already stressed water bodies.
Eric G, Mbonimpa, Yongping, Yuan, Maliha S, Nash, Megan H, Mehaffey   +3 more
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ERYTHROCYTE SEDIMENTATION RATE IN INFECTION OF TOTAL HIP REPLACEMENTS

Orthopedics, 1991
Abstract Erythrocyte sedimentation rate was studied in 79 patients who underwent reoperations for prosthetic hip failures. Fifty-one patients had infected prostheses, confirmed on the basis of sinus formation and cultures taken at the revision operation. Twenty-eight had proven mechanical loosening of their hip prostheses, as five out of five
B, Thorén, A, Wigren
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A Simple Total Sediment Load Formula

World Environmental and Water Resources Congress 2013, 2013
Prediction of total sediment load has been a challenge to river engineers for decades. Two approaches are typically used: One is to directly calculate the total sediment load from measured flow and sediment properties, and the other is to separate total sediment load into bed load and suspended load and calculate them independently.
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Stratigraphy of total metals in PIRLA sediment cores

Journal of Paleolimnology, 1992
Sediment cores from 30 low-alkalinity lakes in northern New England (NE), New York (NY), the northern Great Lakes States (NGLS) of Minnesota, Michigan, and Wisconsin, and Florida (FL) have been dated by 210Pb and analyzed for water and organic content, eight major elements (Al, Ti, Fe, Mn, Ca, Mg, Na, K) plus four trace metals (Pb, Zn, Cu, and V ...
Stephen A. Norton, Ray W. Bienert, Michael W. Binford, Jeffrey S. Kahl   +3 more
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Determination of total sulfur in freshwater sediments by ion chromatography

Water Research, 1989
Abstract A method to determine total sulfur in freshwater sediments has been developed. This method involves oxidation of the sediment by a half fusion reaction with a Na 2 CO 3 /KNO 3 mixture, purification with cation exchange chromatography and detection of the released sulfate by indirect photometric chromatography.
Hordijk, C.A., Van Engelen, J.J.M., Jonker, F.A., Cappenberg, T.E.   +3 more
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Accumulation and distribution of total mercury in estuarine sediments

Estuarine and Coastal Marine Science, 1976
Abstract The mercury concentrations found in sediment cores from an estuary display maximum values in an area where the salt-water influence on the river becomes significant. Statistical analyses indicate the mercury concentrations are associated with fine sediments located in a specific area within the estuary.
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Total sediment discharge sampling over sills

Water Resources Research, 1974
Easily installed wooden sills permit collection of bed load sediment normally missed in the ‘unsampled zone.’ Sills also (1) provide a rigid unchanging control at which to sample, (2) reduce the chance of sample bias from sediment stirred up by the wader, and (3) permit control of the sampling interval because the sample points can be marked directly ...
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Total mercury in sediments from mud volcanoes in Gulf of Cadiz

Marine Pollution Bulletin, 2007
Mercury emissions into the environment have bothnatural and anthropogenic sources. Natural sourcesinclude volcanic activity, erosion of mineral deposits (theearth’s crust contains 0.5 parts per million of mercury)(Gochfeld, 2003; Gustin, 2003), association with hydrocar-bons (Miedaner et al., 2005; Wilhelm et al., 2006), and vol-atilization from the ...
C L, Mieiro, P, Pato, E, Pereira, F, Mirante, J A P, Coutinho, L M, Pinheiro, V H, Magalhães, A C, Duarte   +7 more
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Optimization of total RNA isolation from human urinary sediment

Clinica Chimica Acta, 2016
Extracting RNA from human urinary sediment is notoriously challenging because of cell paucity and hostile environment and column-based commercial kits using silica technology are commonly used. Nonetheless, in our experience, this methodology yields low amounts of total RNA and has low rates of success.
Maria Beatriz, Monteiro, Daniele Pereira, Santos-Bezerra, Karina, Thieme, Marisa, Passarelli, Ubiratan Fabres, Machado, Chin Jia, Lin, Maria Lúcia, Corrêa-Giannella   +6 more
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