Function of Bacterial Polysaccharides in the Soil

Wn, Haworth; Fw, Pinkard; Stacey, M.

doi:10.1038/158836a0

Cited by 21 publications

(4 citation statements)

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“…Martin (1945Martin ( , 1946 established that the " slimy " bacterial products shown by Waksman and Martin (1939) to aggregate sand -clay mixtures were polysaccharides. Stacey and colleagues at the University of Birmingham, England (Haworth et al, 1946 ), and Brian (1946, 1948) at the ICI Research Station, Jealotts Hill, Berkshire, England, were, at about that time, investigating the uses of bacterial dextran and levan polysaccharides for the improvement of soil structure and for the retention of water in soil. The Haworth Group, Geoghegan and Brian, and Martin, though working on a similar topic at about the same time, were unknown to each other.…”

Section: Evolution Of Studies Of Soil Saccharidesmentioning

confidence: 99%

Evolution of Concepts of Environmental Natural Nonliving Organic Matter

Hayes

2009

Biophysico‐Chemical Processes Involving Natural Nonliving Organic Matter in Environmental Systems

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Section: Evolution Of Studies Of Soil Saccharidesmentioning

confidence: 99%

Evolution of Concepts of Environmental Natural Nonliving Organic Matter

Hayes

2009

Biophysico‐Chemical Processes Involving Natural Nonliving Organic Matter in Environmental Systems

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“…Studies on soil-water extracts, particularly rich in organic matter, demonstrate that water-soluble, alcohol-precipitable polysaccharidal substances may be present. Certain investigators have reported the influence of bacterial polysaccharides on soils (3)(4)(5)(6), but the use of bacterial dextran polysaccharides as soil conditioners has not been sufficiently investigated.…”

Section: Dextran and Dextran Products As Soil-conditioning Materialsmentioning

confidence: 99%

Soil Conditioners, Dextran and Dextran Products as Soil-Conditioning Materials

Novak¹,

Witt²,

Hiler³

1955

J. Agric. Food Chem.

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are very good, and their drilling characteristics are considered excellent. AcknowledgmentGrateful acknowledgment is made to staff members of the Farm Machinery SOIL CONDITIONERS Section, Agricultural Engineering Research Branch, who constructed the equipment; to staff members of the Division of Chemical Development, Tennessee Valley Authority, who supplied test materials; and to J. B. Breen of this laboratory, who assisted with the tests.

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“…Bremner (1950) has obtained evidence of the occurrence of D-glucosamine in various soils by paper chromatography. A preliminary announcement on the occurrence of levans in soil (Haworth, Pinkard & Stacey, 1946) is of interest, especially in view of the work of Martin (1945, 1946), Geoghehan & Brian (1946 and Swaby (1949, q o ) , who have shown that certain bacterial levans and other materials of high molecular weight have a profound effect on the degree of aggregation of soils. Haworth et al (1946) state that polysaccharides of the dextran type have an important effect on the moisture-binding capacity of soils.…”

Section: Introductionmentioning

confidence: 99%

The occurrence of methylated carbohydrates and rhamnose as components of soil polysaccharides

Duff

1952

J Sci Food Agric

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oils, fully saturated triglycerides do not occur in significant proportions unless the unsaturated acid content is below that (about 350/6) necessary to permit of each mixed triglyceride molecule containing one unsaturated acyl group. On this assumption tiger fat which contains about jI% unsaturated acids should not contain any trisaturated glycerides. But land-animal fats stand apart from this rule and many fats (ox, sheep etc.) show a much higher content of trisaturated glycerides. From the graph in which the contents of fully saturated glycerides were plotted against saturated acids of land-animal fats (Hilditch, 1947, p. 303), we find that the content of trisaturated glycerides should be about 3% higher than the observed value for the tiger fat under discussion. As mentioned before, the quantity of fat available was insufficient to permit a separate determination of fully saturated glycerides by the method of Hilditch & Lea (1927) ; in this case the matter would have been clear, as we believe that a small quantity of fully saturated glyceride would have passed into fraction B. Taking this to be true, our figure for fully saturated glyceride might approach 9%. On the other hand, as the component glycerides of no other carnivorous-animal fat is available, no comparable data can be quoted. The fully saturated glyceride content of tiger fat, however, compares well with that of a ewe (Hilditch & Zaky, 1941) (external) fat which contains 50% of saturated acids and 5% of fully saturated glycerides.The similarity in the fatty acid composition to that of other land-animal fats suggests that at least some of the glycerides from the diet have been deposited as such. If this be so then the proportion of fully saturated glycerides is rather lower than expected. If it is assumed that no fully saturated glycerides have passed into fraction B, i.e. that their observed content is the true content, then it appears that some bio-dehydrogenation has taken place.

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Function of Bacterial Polysaccharides in the Soil

Cited by 21 publications

References 0 publications

Evolution of Concepts of Environmental Natural Nonliving Organic Matter

Evolution of Concepts of Environmental Natural Nonliving Organic Matter

Soil Conditioners, Dextran and Dextran Products as Soil-Conditioning Materials

The occurrence of methylated carbohydrates and rhamnose as components of soil polysaccharides

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