ISSN:0022-5142    

DOI:10.1002/jsfa.2740070801

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractThe effects of depth of cultivation on aggregation of the Harlington field station soil, during 1949 and 1950, are examined, the crops studied being swedes in 1949 and spring wheat in 1950.The type of cultivation influenced the size distribution of aggregates, mainly in the surface 4 in. of soil. The larger aggregates>0 ·5 mm., particularly those of 4–2 mm. diam., were more especially affected. Both deep‐ and shallow‐ploughed plots contained a higher percentage of larger aggregates>0·5 mm. than did the tine‐cultivated plots. The plough by inverting the slice brought the better structured sub‐surface soil to the surface and thus increased the percentage of larger aggregates>0·5 mm. in the 0–4‐in. layer. This effect of ploughing lasted for abouut 4 to 5 months.Except in one instance, the type of cultivation did not affect the ‘degree’ of aggregation of particles1· 0 mm. than did horizon A2. The reverse was true of the smaller aggregates<1·0 mm., particularly those of 0·25–0·05 mm. diam. Differences between the proportion of very fine particles (4·0–2·0 mm. ≫ 4·0 mm., and that among individual layers in the soil profile was: 0–2‐in., 8–12‐in. layersOctober, July.No significant differences existed between the cultivation treatments in regard to disruption of aggregates or in their stability.No experimental evidence was obtained that finer m

ISSN:0022-5142    

DOI:10.1002/jsfa.2740070802

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractIn the canning of jack fruit, pH plays an important part. Addition of 0·75 to 1% citric acid to the canning syrup has been found necessary for safe processing in boiling water. Canning of jack fruit in combination with more acidic fruits likeBangaloramango and pineapple achieves the same purpose and provides acceptable products

ISSN:0022-5142    

DOI:10.1002/jsfa.2740070803

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractA simple and rapid method is described for extracting and measuring the nitric oxide‐haem pigments present in cooked cured meat.Selective extraction as a nitric oxide‐haem‐acetone complex is achieved by the use of an acetone/water solvent. Other meat pigments are not extracted under the conditions used.The acetone/water ratio is shown to be critical, maximum extraction being obtained with a ratio of 4: 1, due allowance being made for the moisture present in the meat. After filtration, the optical density is measured spectrophotometrically.With the inclusion of hydrochloric acid in the solvent, the method can be adapted to measure thetotalpigments pr

ISSN:0022-5142    

DOI:10.1002/jsfa.2740070804

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractThe remarkable effect of a soil conditioner on the germination of wheat in pot experiments with a heavy soil of the Cruden Bay Association is described. A field experiment was also carried out resulting in no effect on the crop but in a significant increase in the amount of water‐stable aggregates in the soil. On a light soil, improvement in growth of carrots was observe

ISSN:0022-5142    

DOI:10.1002/jsfa.2740070805

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractIn a study of twenty‐four sides of bone‐tainted beef, large numbers of Gram‐positive rods were observed in every case. At least twelve different organisms, including anaerobes, sporing aerobes and non‐sporing aerobes, were isolated from fourteen of the sides. Evidence is presented to suggest that neither bone marrow nor synovial fluid is the centre from which the tainting organisms spreads.The ischiatic and popliteal lymph nodes of freshly‐killed cattle frequently contain bacteria, many of them Gram‐positive rods. The incidence of nodes containing these rods appears to be related to the rainfall during the two months preceding slaughter.It is suggested that Gram‐positive rods enter abrasions in the skin of the cattle and are localized in the lymph nodes. After death, given suitable temperature and pH requirements, the organisms multiply and spread outwards to the neighbouring muscles pr

ISSN:0022-5142    

DOI:10.1002/jsfa.2740070806

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractThe paper describes variations in the interfacial activity of aqueous solutions of anionic wetting agents which occur on addition of natural fleece. The results are compared with those already described for cationic wetting agents. The influence of concentration, chain length and positive ion of the anionic compound, and time of immersion of the fleece, has been studied. Differences between anionic and cationic systems can be attributed mainly to the greater solubility of the long‐chain complex C+A‐ formed by reaction between the soluble constituents of suint and the wetting ag

ISSN:0022-5142    

DOI:10.1002/jsfa.2740070807

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractComparison is made of the stability of anionic and cationic emulsions in the absence and presence of fleece. The quantity of oil phase removed by fleece from anionic emulsions under various conditions has been measured. Anionic wetting agents are attractive for the formulation of emulsion dips in that the uptake of oil phase on fleece samples added successively is regular and of suitable magnitude, and is largely independent of the positive ion, chain length and concentration of the wetting agent. They suffer, however, from the serious disadvantage that the uptake of oil phase varies with time of immersion, which is likely to render difficult the control of insecticide deposits.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740070808

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractMineralization of the nitrogen of two urea‐formaldehyde compounds has been studied in twenty soils having initial pH values ranging from 3·9 to 7·8. The results show highly significant negative correlations between soil pH and the accumulation of inorganic nitrogen throughout the experiments. For comparison, the initial rates of decomposition of a sample of hoof were also studied in the same soils. In contrast to the urea‐formaldehyde compounds, mineralization of the nitrogen of hoof was markedly retarded in three of the most acid soils, the results for the remaining soils showing no significant relationship to so

ISSN:0022-5142    

DOI:10.1002/jsfa.2740070809

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY