Results 251 to 260 of about 45,674 (312)

Statistical filtering to aid in the sorting of phytoplankton: The effects of image library size and phytoplankton shape

Limnology and Oceanography: Methods, EarlyView.
Abstract The demand for efficient image sorting methods has increased due to technological advancements that enable more intensive phytoplankton monitoring. Both statistical and machine learning algorithms can misidentify algal taxa in taxonomically diverse samples, in which phytoplankton morphology and image traits can vary.
Christopher R. Farrow, Josef D. Ackerman
wiley   +1 more source

A simplified two‐station approach for modeling metabolism in dam tailwaters subject to diel flow variation

Limnology and Oceanography: Methods, EarlyView.
Abstract Tailwaters are ubiquitous and highly managed ecosystems whose food webs often rely disproportionately on autochthonous energy. In situ continuous dissolved oxygen data are increasingly being used to estimate gross primary productivity and ecosystem respiration in rivers, but this approach is complicated in tailwaters, where upriver ...
Ian W. Bishop, Bridget R. Deemer, Theodore A. Kennedy, Robert A. Payn, Robert O. Hall Jr., Charles B. Yackulic   +5 more
wiley   +1 more source

Effects of preservatives and poisons on the elemental and isotopic composition of freshwater particulate organic matter

Limnology and Oceanography: Methods, EarlyView.
Abstract Sediment traps, often used in tandem with preservatives or poisons, are widely used for the collection of particulate organic matter (POM), providing insight into the source to sink mechanisms that shape major biogeochemical cycles and sedimentary carbon sequestration.
Diana Velazquez, Nathan D. Sheldon, Jenan J. Kharbush   +2 more
wiley   +1 more source

Human activities control the source of eroded organic carbon in lake sediments over the last 100 years: Evidence from stable isotope fingerprinting. [PDF]

Fundam Res
Wang S, Nie X, Ran F, Liao W, Yang C, Xiao T, Liu Y, Liu Y, Li Z.   +8 more
europepmc   +1 more source

The Potential for Absolute Temperature Imaging Based on Brain Metabolites Using an FID‐Shifting Approach in Gradient Echo Planar Spectroscopic Imaging (GREPSI)

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To implement and evaluate an efficient method for absolute temperature measurement using a gradient echo implementation of the echo planar spectroscopic imaging (EPSI) sequence. Methods The gradient echo EPSI sequence (GREPSI) utilizes an oscillating readout gradient together with continuous signal readout after slab selective ...
Dennis L. Parker, Henrik Odéen, Peyton Wong, Seong‐Eun Kim, Wesley Judd, Duane D. Blatter   +5 more
wiley   +1 more source

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Lake Water and Sediment

Limnology and Oceanography, 1958
The phosphorus equilibration pattern and rate between mud and water was the same in natural Jenkin sampler cores, in artificial cores, and in bottles in which dredged surface mud was packed by centrifuge. Thus any specific natural physico‐chemical or bacteriological layering of the surface muds of lakes is relatively unimportant in phosphorus exchange.
F. R. HAYES, J. E. PHILLIPS
  +4 more sources

Crenarchaeota in Lake Michigan sediment

Applied and Environmental Microbiology, 1997
RNA from Lake Michigan sediment was hybridized with a DNA probe for archaeal 16S rRNA. There was a peak of archaeal rRNA abundance in the oxic zone and another immediately below it. Six contributing species were identified by PCR amplification of extracted DNA with primers specific for archaeal rDNA: two related to Methanosarcina acetivorans and four ...
B J, MacGregor, D P, Moser, E W, Alm, K H, Nealson, D A, Stahl   +4 more
openaire   +2 more sources

Varves in lake sediments – a review

Quaternary Science Reviews, 2015
Abstract Downcore counting of laminations in varved sediments offers a direct and incremental dating technique for high-resolution climatic and environmental archives with at least annual and sometimes even seasonal resolution. The pioneering definition of varves by De Geer (1912) had been restricted to rhythmically deposited proglacial clays.
Bernd Zolitschka, Pierre Francus, Antti E.K. Ojala, Arndt Schimmelmann   +3 more
openaire   +2 more sources

Lake types and lake sediments

SIL Proceedings, 1922-2010, 1961
(1961). Lake types and lake sediments. SIL Proceedings, 1922-2010: Vol. 14, No. 1, pp. 285-290.
openaire   +1 more source

Sediments of Ypacarai Lake

Journal of Radioanalytical and Nuclear Chemistry Articles, 1992
Bottom and sestonic sediments of Ypacarai Lake were invesetigated with XRF and Mossbauer techniques. The 120 km2 lake, depth averages 1.8 m. In addition to the lakes use for recreation, its basin has economic significance. Sediments play an important role in the distribution of trace elements in the aquatic system and as a sink for metals.
R. Velazquez, R. Alviso, J. Facetti
openaire   +1 more source