Results 261 to 270 of about 109,469 (312)

Chemical Fractionation of Phosphorus in Stabilized Biosolids

Journal of Environmental Quality, 2008
Three chemicals—ferrous sulfate (FeSul), calcium oxide (CaO), and aluminum sulfate (alum)—were applied at different rates to stabilize P in fresh, anaerobically digested biosolids (FBS) obtained from an activated sewage treatment plant. A modified Hedley fractionation procedure was used to assess P forms in these sludge‐borne materials and in a ...
Xiao-Lan, Huang, Yona, Chen, Moshe, Shenker   +2 more
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Fractionation and chemical properties of tear mucoids

Experimental Eye Research, 1971
Abstract The physical and chemical properties of glycoproteins in the precorneal tear film that covers the corneal epithelium have never been clearly delineated. Crude mucoid clots were collected from the conjunctival surface of rabbits. Three types of glycoprotein were fractionated by gel filtration on Sephadex G-150 using tear mucoid.
S, Iwata, I, Karbasawa
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Inactivation of Brucellaphages by Chemical Fractions of Brucella

Nature, 1965
IN order to examine the inactivation of phages the following Brucella substrates were used: (a) Acetone-killed bacteria of Brucella melitensis strain 16 M, suis 1330 and abortus strain 12, according to Olitzki1; (b) protein, polysaccharide and nucleoprotein fractions of Brucella melitensis strain 16 M obtained by extraction with phenol-water, according
J, Parnas, M, Tuskiewicz, S, Zalichta
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Isotopic fractionation – chemical v. environmental perspective

Environmental Chemistry, 2012
In recent years, we have witnessed an enormous increase in applications of quantitative isotopic measurements that have contributed to solving problems related to chemical pollution. Some fundamental concepts have been laid out in an excellent introduction on this developing technique.
Paneth, Piotr
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Critical Aspects of Sedimentary Phosphorus Chemical Fractionation

Journal of Environmental Quality, 1994
AbstractSequential leaching procedures have been widely used as an environmental tool to quantify sedimentary P reservoirs. Nevertheless, they still present important issues that need to be investigated such as readsorption of leached ions and organic P hydrolysis.
Barbanti A, Bergamini M C, Frascari F, Miserocchi S, Rosso G   +4 more
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Chemical fractionation of uranium isotopes

Journal of Inorganic and Nuclear Chemistry, 1969
Abstract Precise measurements were made of the chemical fractionation of uranium-235 and uranium-238 between several forms of U(IV) and U(VI) salts. The observed separation factors were very much smaller than previously supposed. It is shown that the chemical exchange method of isotope separation is unlikely to be economically or technically useful.
A.C. Rutenberg, J.S. Drury
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The Fractionation of Copolymers by Chemical Composition

Journal of Macromolecular Science: Part A - Chemistry, 1968
Abstract Phase diagrams for the system of methyl ethyl ketone, cyclo-hexane, and styrene-acrylonitrile copolymer were determined. The phase diagrams indicate that the copolymer may be fractionated by chemical composition in this system. Discussions of the thermodynamics are also presented, to show that copolymers can effectively be fractionated into ...
Shinya Teramachi, Mitsuru Nagasawa
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Partial Purification of Aflatoxins by Simple Chemical Fractionation

Zentralblatt für Bakteriologie, Parasitenkunde, Infektionskrankheiten und Hygiene. Zweite Naturwissenschaftliche Abteilung: Allgemeine, Landwirtschaftliche und Technische Mikrobiologie, 1974
Summary A simple chemical fractionation procedure for the partial purification of aflatoxins, produced by a locally isolated Aspergillus flavus strain, was carried out. According to this procedure it was possible to isolate aflatoxin B free from other interfering compounds. Rf values, U.V.
M S, Tewfik, M, el-Khadem, Y A, Hamdi
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Chemical constituents of the antibiotic fraction ofArnebia nobilis

Experientia, 1969
Aus den Wurzeln vonArnebia nobilis wurden 4 antibiotisch wirksame Stoffe isoliert. Die Struktur von dreien wurde aufgeklart.
Y N, Shukla, J S, Tandon, D S, Bhakuni, M M, Dhar   +3 more
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Chemical fractionations in meteorites—III. Major element fractionations in chondrites

Geochimica et Cosmochimica Acta, 1970
Abstract Some 20 elements, including the major constituents of chondritic matter, are fractionated among the several chondrite classes. We have tried to explain these fractionations on the assumption that they occurred in the solar nebula, starting from material of carbonaceous chondrite composition. 1. (1) Lithophile elements (Al, Ca, Cr, Hf, Mg,
J.W Larimer, Edward Anders
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