The role of fulvic acid composition in the photosensitized degradation of aquatic contaminants

2009 ◽  
Vol 71 (2) ◽  
pp. 160-169 ◽  
Author(s):  
Jennifer J. Guerard ◽  
Penney L. Miller ◽  
Tamara D. Trouts ◽  
Yu-Ping Chin
Keyword(s):  
Fulvic Acid ◽  
Acid Composition ◽  
Aquatic Contaminants

A spectroscopic study of soil fulvic acid composition after six-year applications of urban waste compost

Agronomie ◽  
2003 ◽  
Vol 23 (8) ◽  
pp. 719-724 ◽  
Author(s):  
Giovanni Gigliotti ◽  
Alceo Macchioni ◽  
Cristiano Zuccaccia ◽  
Pier Lodovico Giusquiani ◽  
Daniela Businelli
Keyword(s):  
Spectroscopic Study ◽  
Fulvic Acid ◽  
Acid Composition ◽  
Urban Waste

HUMUS FRACTION RATIOS AS A MEANS OF DISCRIMINATING BETWEEN HORIZON TYPES

1980 ◽  
Vol 60 (2) ◽  
pp. 219-229 ◽  
Author(s):  
L. E. LOWE
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Carbon Content ◽  
Fulvic Acid ◽  
Soil Classification ◽  
Acid Fraction ◽  
Humus Fraction ◽  
Wide Range ◽  
Fraction Distribution

Humus fraction distribution in a wide range of horizon samples was examined by measuring carbon content in humic acid (Ch), in fulvic acid (Cf) and in the strongly colored polyphenolic component of the fulvic acid fraction (Ca). Fraction distribution was described by the ratios Ch/Cf and Ca/Cf. It was concluded that humus fraction ratios were related to horizon types as used in the Canadian System of Soil Classification, and were effective in discriminating between certain horizon types, particularly between Luvisolic Bt and Podzolic Bf. The results also suggested that humus fraction ratios may be effective in separating distinct sub-populations within Ah horizons and Bf horizons in general, based on qualitative differences in organic matter present. Aspects of the role of humus fractions in soil genesis are discussed.

The Mesogloea of Pelagia noctiluca

1959 ◽  
Vol s3-100 (52) ◽  
pp. 599-610
Author(s):  
G. CHAPMAN
Keyword(s):  
Electron Microscope ◽  
Amino Acid ◽  
Amino Acid Composition ◽  
Acid Composition ◽  
Pelagia Noctiluca ◽  
Fresh State

The arrangement of the mesogloea fibres of Pelagia noctiluca is described chiefly from material examined in the fresh state. The role of the mesogloea in swimming is shown to be the antagonization of the subumbrellar circumferential muscles. The fibres of the mesogloea are shown to be collagenous by their contraction on heating, their amino-acid composition, and their appearance under the electron microscope. A suggestion is made to account for the characteristic arrangement of the fibres at a distance from the cellular layers.

Regulation Of The Fatty Acid Composition Of Platelet Phospholipids

1981 ◽  
Author(s):  
M L McKean ◽  
J B Smith ◽  
M J Silver
Keyword(s):  
Fatty Acids ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Unsaturated Fatty Acids ◽  
De Novo ◽  
Membrane Phospholipids ◽  
De Novo Biosynthesis ◽  
Coa Transferase

The fatty acid composition of cell membrane phospholipids does not remain constant after de novo biosynthesis, but undergoes continual remodelling. One of the major routes for remodelling probably includes the deacylation-reacylation steps of the Lands Pathway. This has been shown to be important for the incorporation of long chain, polyunsaturated fatty acids into phospholipids by liver and brain. An understanding of the mechanisms involved in these processes in platelets is especially important in light of the large stores of arachidonic acid (AA) in platelet phospholipids and the role of AA in hemostasis and thrombosis. Previous results from this laboratory have shown that the turnover of radioactive AA, 8,11,14-eicosatrienoic and 5,8,11,14,17-eicosapentaenoic acids in the phospholipids of resting platelets is more rapid than the turnover of radioactive C16 and C18 saturated and unsaturated fatty acids. However, little is known about how fatty acids, especially AA and its homologues, are incorporated into platelet phospholipids during de novo biosynthesis or how they are exchanged during remodelling.At least three enzymes are involved in the deacylation- reacylation of phospholipids: phospholipase A2; acyl CoA synthetase; and acyl CoA transferase. We have studied acyl CoA transferase and have found considerable activity in human platelet membranes. Experiments are in progress to determine the substrate specificity and other properties of this enzyme.

Role of dietary lipids on fetal tissue fatty acid composition and fetal survival in swine at 42 days of gestation

1995 ◽  
Vol 73 (5) ◽  
pp. 1372-1380 ◽  
Author(s):  
A. Perez Rigau ◽  
M. D. Lindemann ◽  
E. T. Kornegay ◽  
A. F. Harper ◽  
B. A. Watkins
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Fetal Tissue ◽  
Dietary Lipids ◽  
Tissue Fatty Acid Composition ◽  
Fetal Survival ◽  
Tissue Fatty Acid

The role of free radicals in the oxidation and reduction of fulvic acid

1977 ◽  
Vol 9 (6) ◽  
pp. 397-403 ◽  
Author(s):  
N. Senesi ◽  
Y. Chen ◽  
M. Schnitzer
Keyword(s):  
Free Radicals ◽  
Fulvic Acid
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