ISSN:0022-5142    

DOI:10.1002/jsfa.2740020702

出版商:John Wiley&Sons, Ltd    

年代:1951

数据来源: WILEY

摘要:

AbstractPhenyl mercuric dinaphthylmethanedisulphonate has been investigated as a seed dressing. Considerations leading to the choice of this material are discussed and the substance is compared with other materials used in seed disinfection. It is shown that this material is an effective fungicide and of comparatively low toxicity to animals and germination.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740020703

出版商:John Wiley&Sons, Ltd    

年代:1951

数据来源: WILEY

摘要:

AbstractA method has been worked out for determining the full composition of commercial octamethylpyrophosphoramide. It is shown that perdimethylamides of higher polyphosphoric acids are present, principally triphosphoric acid penta(dimethylamide), which is a valuable insecticide, in addition to the pyroamide and the trisdimethylamide of orthophosphoric acid. The properties of the various compounds as far as they affect analysis and stability are described, and some facts about their interconversion on heating are recorded.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740020704

出版商:John Wiley&Sons, Ltd    

年代:1951

数据来源: WILEY

摘要:

AbstractA method of determining small traces of the insecticide in treated crops is described and the validity of the method for assessment of toxic risk to the consumer is discussed. The method is sensitive to 0·1 mg. insecticide per kg. of plant tissue in the absence of interfering substances which may, however, give rise to ‘blanks’ of up to 1 mg

ISSN:0022-5142    

DOI:10.1002/jsfa.2740020705

出版商:John Wiley&Sons, Ltd    

年代:1951

数据来源: WILEY

摘要:

AbstractMethods for estimating dissolved oxygen in beer and for measuring the reducing activity of beer have been applied to the study of oxidation in apple juice during processing and throughout its shelf‐life in bottle. Freshly pressed juice is highly oxidized but becomes less so after clarification and filtration. Juices differ in their ability to absorb additional oxygen during processing and there is a protracted time‐lag between absorption and increase in oxidation. In general, after bottling, oxidation increases unless the juice is pre‐heated before the bottles are sealed. After long storage in bottle, apple juice becomes strongly reducing, dissolved oxygen diminishes and a sediment is thrown. Hazes and deposits develop less rapidly in pasteurized juices than in those bottled by sterile filtration and are generally less intense if either air‐space in the bottle or excess oxygen in the juice is

ISSN:0022-5142    

DOI:10.1002/jsfa.2740020706

出版商:John Wiley&Sons, Ltd    

年代:1951

数据来源: WILEY

摘要:

AbstractRemoval of dissolved oxygen from apple juice in a laboratory deaeration‐apparatus has been studied. The efficiency of the deaerator for removing dissolved oxygen from cold water was found to vary with the initial oxygen content and history of the sample, and did not exceed 76%. The efficiency was raised to well over 80% by multiple‐stage deaeration, and to over 96% by single‐stage deaeration at temperatures of 120° F. or over.Oxygen removed from apple juice in the same apparatus was poor. Three‐stage deaeration at temperatures of 180° F. was required to attain 89% efficiency on fresh juice, whereas tank‐stored juice under similar conditions lost less than 40% of its oxygen. Oxygen dissolved in apple juice is believed to exist in both ‘free’ and ‘bound’ states, the proportion of ‘bound’ to ‘free’ increasing with length of storage. Only the ‘free’ oxygen is r

ISSN:0022-5142    

DOI:10.1002/jsfa.2740020707

出版商:John Wiley&Sons, Ltd    

年代:1951

数据来源: WILEY

摘要:

AbstractDeterminations have been made of the amounts of HCN in bracken at various stages of maturity and of the apparent retention of cyanide by animals fed on fresh bracken, dried bracken and hay plus sodium cyanide.Newly emerging bracken shoots contained up to 50 mg. HCN per 100 g. dry matter but the mean value for early‐summer bracken (18 June to 16 July) was only 3·35 mg. per 100 g. dry matter and that for early‐autumn plants (18 Aug. to 27 Sept.) only 1·81 mg. per 100 g. A young second‐growth in October contained an average of 7·35 mg. per 100 g. There were considerable day‐to‐day fluctuations in the HCN content of bracken.As it was difficult to arrive at valid figures for normal urinary cyanide and thiocyanate no attempt was made to correct the urinary excretion values obtained for bracken‐fed animals but the apparent retention of HCN was nevertheless high in nearly all cases. HCN destroyed in the digestive tract or excreted through the lungs could not be measured, these fractions being included in the figures for apparent retention; the high apparent retention of HCN by bracken‐fed animals is therefore not regarded as sufficient evidence to indicate the cyanogenetic principle as a causative factor in ruminant bracken ‘poisoning.’ The relatively low HCN content of bracken during most of the season, the insignificant amounts of cyanide found in the liver and rumen contents of bracken ‘poisoned’ animals and the failure of thiosulphate injections to promote recovery suggest that danger arising from the cyanogenetic principle of bracken is likely to be slight. The administration of sodium cyanide did not lead to any increase in the combined urinary excretion of cyanide and thiocyanate, indicating a difference from the metabolism of the cyanogene

ISSN:0022-5142    

DOI:10.1002/jsfa.2740020708

出版商:John Wiley&Sons, Ltd    

年代:1951

数据来源: WILEY

ISSN:0022-5142    

DOI:10.1002/jsfa.2740020701

出版商:John Wiley&Sons, Ltd    

年代:1951

数据来源: WILEY