Results 211 to 220 of about 148,512 (255)
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Nutrient dynamics on a precipitation gradient in Hawai'i
Oecologia, 1998We evaluated soil and foliar nutrients in five native forests in Hawai'i with annual rainfall ranging from 500 mm to 5500 mm. All of the sites were at the same elevation and of the same substrate age; all were native-dominated forests containing Metrosiderospolymorpha Gaud.
Amy T, Austin, P M, Vitousek
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Fractionation of dextrin by gradient polyethylene glycol precipitation
Journal of Chromatography A, 2016This work aimed at developing a novel approach, named gradient polyethylene glycol (PEG) precipitation, to fractionate dextrin into fractions with narrower molecular weight distribution. This approach was based on the incompatibility between PEG and dextrin in aqueous solution; this incompatibility is positively correlated with the molecular weight of ...
Xiuting, Hu +3 more
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Thermal degradation of lignins fractionated by gradient acid precipitation
Journal of Analytical and Applied Pyrolysis, 2021Abstract The pyrolysis behavior of lignin fractions fractionated by gradient acid precipitation from poplar kraft pulping black liquor was investigated by pyrolysis–gas chromatography/mass spectrometry (Py–GC/MS). The results revealed that the molecular weight of lignin had no distinct effect on the categories of pyrolysis products, while had an ...
Xue-Ming Zhang, Xiaosa Cao, Lupeng Shao
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Coarsening of precipitate clusters in stress gradients
Scripta Materialia, 1996Several recent theoretical studies and computer simulations have shown that a misfit strain and a uniform applied stress field can induce strong spatial correlations between precipitates during coarsening of two-phase microstructures. The sign and magnitude of the misfit strain and applied stress, and the difference in elastic constants between ...
Werner Hort, William C. Johnson
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Separation of proteins by gradient solvent extraction of a protein precipitate
Archives of Biochemistry and Biophysics, 1955Abstract A mixture of bovine serum albumin and human hemoglobin is used to show the applicability of the gradient extraction method for the fractionation of proteins. The mixture is precipitated with ammonium sulfate and serially extracted with ammonium sulfate solution continuously diluted with water.
C A, ZITTLE, E S, DELLAMONICA
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International Journal of Remote Sensing, 2009
Precipitation is a major determinant of vegetation production at the regional scale, especially in tropical areas. Recent works, however, have shown that this relationship is weak at the interannual temporal scale, particularly in mesic ecosystems, where limitations other than water constrain vegetation production.
Chamaillé-Jammes, Simon, Fritz, Hervé
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Precipitation is a major determinant of vegetation production at the regional scale, especially in tropical areas. Recent works, however, have shown that this relationship is weak at the interannual temporal scale, particularly in mesic ecosystems, where limitations other than water constrain vegetation production.
Chamaillé-Jammes, Simon, Fritz, Hervé
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Preparative fractionation of dextrin by gradient alcohol precipitation
Separation Science and Technology, 2017This work investigated the impacts of the initial pH and salt of the dextrin solution on fractionating dextrin by gradient alcohol precipitation, represented by gradient ethanol precipitation.
Xiuting Hu +3 more
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LARGE-SCALE PRECIPITATION VOLUMES, GRADIENTS, AND DISTRIBUTION
Monthly Weather Review, 1963Abstract During the past two years, the Quantitative Precipitation Forecast Unit of the National Meteorological Center has collected, as a by-product of its verification program, a large quantity of data relating to observed precipitation amounts. A technique is developed to process these data into precipitation volumes for varying time periods.
JERROLD A. La RUE, RUSSELL J. YOUNKIN
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Soil Microbial Abundance and Diversity Along a Low Precipitation Gradient
Microbial Ecology, 2010The exploration of spatial patterns of abundance and diversity patterns along precipitation gradients has focused for centuries on plants and animals; microbial profiles along such gradients are largely unknown. We studied the effects of soil pH, nutrient concentration, salinity, and water content on bacterial abundance and diversity in soils collected
Bachar, A. +6 more
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Carbon exchange responses of a mesic grassland to an extreme gradient of precipitation
Oecologia, 2018Growing evidence indicates that ecosystem processes may be differentially sensitive to dry versus wet years, and that current understanding of how precipitation affects ecosystem processes may not be predictive of responses to extremes. In an experiment within a mesic grassland, we addressed this uncertainty by assessing responses of two key carbon ...
Andrew J. Felton +2 more
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