摘要:

AbstractPolyphenolic substances in acid extracts of cacao leaves have been separated by paper partition chromatography. The substance which gives a red colour when cacao leaf extracts are heated with alkali, a reaction which has been used as the basis of a ‘colour‐test’ for detecting infection with swollen shoot virus, has the properties of aleuco‐anthocyanin. The amount of red‐producingleuco‐anthocyanin varies with the total tannin content of the leaf. In addition to virus infection, other factors such as age of leaf and variety of cacao which affect the total tannin content also affect theleuco‐anthocyanin content. The bearing of this on the applicability of the ‘colour‐t

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081002

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractThe activities against the eggs and young mites of the glasshouse red spider (Tetranychus telariusL.) shown by a number of compounds, all containing two benzene nuclei linked by various sulphur‐containing bridges, are tabulated and discusse

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081003

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractThe activities against the eggs and young mites of the glasshouse red spider (Tetranychus telariusL.) have been determined for a series of benzyl phenyl sulphides containing only halogen nuclear substituents. The results, together with the results from some of the corresponding sulphoxides and sulphones, are tabulated and discussed.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081004

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractThe saponified cuticular wax from sugar cane (N.Co 310 variety) was found to consist of an acid fraction (containing some triene‐unsaturated acids), small amounts of hydrocarbons in the C27–C31range, and of lower and higher molecular weight substances made up of aliphatic alcohols (of whichn‐octacosanol was identified as the main component),αβ‐unsaturated and saturated ketones. Some of these unidentified compounds are shown to be artefacts produced on heating and saponification of the ori

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081005

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractPreliminary consideration suggested a technique for studying the caking of granular fertilizers on a laboratory scale similar to that used in soil mechanics. An apparatus and technique were devised, and details of these are given. Time of storage of the fertilizer is found to be an important factor, and caking is rapid in the first few days. Preliminary investigations on the effect of chemical composition showed setting to be more serious when ammonium sulphate (I), superphosphate (2) and muriate of potash (3) were all present than when only (I) and (2), or (2) and (3) were included. Free acid content seemed to have little effect nor had light ammoniation of the superphosphate. Moisture content is related to caking, which has been reduced to negligible amounts by drying down to less than I% free moisture. Caking increases with the temperature, and this indicates the desirability of cooling. The correlation between the test developed and the results obtained on the large scale is discussed, and is shown to be sufficiently good for the test to be of considerable value.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081006

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractThe distribution of ethylene dibromide vapour round an injection point has been measured experimentally in a number of soils. It is concluded that diffusion is the most important factor controlling distribution. The concentration–time products (C.T.) have been calculated at various distances from the injection point and an LD50range has been derived from the C.T.–distance curves. These LD50ranges were found to have a linear relationship with the soil porosity for all soils at two temperatures. The implications of these findings are discus

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081007

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractMercury residues have been determined on glasshouse crops of tomatoes which have been treated with mercury aerosols. The results show that in some cases 0.5 p.p.m. (as metallic mercury) may be present on the fruit as it is harvested. This mercury contamination is situated mainly in the pulp of the tomato and is a potential health hazard to the consumer.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081008

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractIn a study of the extent of insect damage and determination of quality of groundnuts stored in sacks for 16 months in a warehouse in N. Nigeria, there was found little difference between undecorticated, hand‐shelled and ‘pestle‐and‐mortar’‐shelled nuts, in the loss of weight and production of powder, as a result of attack by insects (mainlyTribolium castaneum), but there were large differences in the build‐up of free fatty acids. The insects are shown to cause breakage of the nuts, but under the conditions of the experiment an unbroken shell provides complete protection of the kernels against the

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081009

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081001

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY